1 | /* |
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2 | * vmm.c - virtual memory manager related operations interface. |
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3 | * |
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4 | * Authors Ghassan Almaless (2008,2009,2010,2011, 2012) |
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5 | * Mohamed Lamine Karaoui (2015) |
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6 | * Alain Greiner (2016) |
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7 | * |
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8 | * Copyright (c) UPMC Sorbonne Universites |
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9 | * |
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10 | * This file is part of ALMOS-MKH. |
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11 | * |
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12 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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13 | * under the terms of the GNU General Public License as published by |
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14 | * the Free Software Foundation; version 2.0 of the License. |
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15 | * |
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16 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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17 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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19 | * General Public License for more details. |
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20 | * |
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21 | * You should have received a copy of the GNU General Public License |
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22 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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23 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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24 | */ |
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25 | |
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26 | #include <kernel_config.h> |
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27 | #include <hal_types.h> |
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28 | #include <hal_special.h> |
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29 | #include <hal_gpt.h> |
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30 | #include <hal_vmm.h> |
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31 | #include <printk.h> |
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32 | #include <memcpy.h> |
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33 | #include <rwlock.h> |
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34 | #include <list.h> |
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35 | #include <xlist.h> |
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36 | #include <bits.h> |
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37 | #include <process.h> |
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38 | #include <thread.h> |
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39 | #include <vseg.h> |
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40 | #include <cluster.h> |
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41 | #include <scheduler.h> |
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42 | #include <vfs.h> |
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43 | #include <mapper.h> |
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44 | #include <page.h> |
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45 | #include <kmem.h> |
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46 | #include <vmm.h> |
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47 | |
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48 | ////////////////////////////////////////////////////////////////////////////////// |
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49 | // Extern global variables |
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50 | ////////////////////////////////////////////////////////////////////////////////// |
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51 | |
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52 | extern process_t process_zero; // defined in cluster.c file |
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53 | |
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54 | |
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55 | /////////////////////////////////////// |
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56 | error_t vmm_init( process_t * process ) |
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57 | { |
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58 | error_t error; |
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59 | vseg_t * vseg_kentry; |
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60 | vseg_t * vseg_args; |
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61 | vseg_t * vseg_envs; |
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62 | intptr_t base; |
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63 | intptr_t size; |
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64 | |
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65 | #if DEBUG_VMM_INIT |
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66 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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67 | if( DEBUG_VMM_INIT ) |
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68 | printk("\n[DBG] %s : thread %x enter for process %x / cycle %d\n", |
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69 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
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70 | #endif |
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71 | |
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72 | // get pointer on VMM |
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73 | vmm_t * vmm = &process->vmm; |
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74 | |
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75 | // initialize local list of vsegs |
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76 | vmm->vsegs_nr = 0; |
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77 | xlist_root_init( XPTR( local_cxy , &vmm->vsegs_root ) ); |
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78 | remote_rwlock_init( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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79 | |
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80 | assert( ((CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE) |
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81 | <= CONFIG_VMM_ELF_BASE) , __FUNCTION__ , "UTILS zone too small\n" ); |
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82 | |
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83 | assert( (CONFIG_THREAD_MAX_PER_CLUSTER <= 32) , __FUNCTION__ , |
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84 | "no more than 32 threads per cluster for a single process\n"); |
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85 | |
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86 | assert( ((CONFIG_VMM_STACK_SIZE * CONFIG_THREAD_MAX_PER_CLUSTER) <= |
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87 | (CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE)) , __FUNCTION__ , |
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88 | "STACK zone too small\n"); |
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89 | |
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90 | // register kentry vseg in VSL |
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91 | base = CONFIG_VMM_KENTRY_BASE << CONFIG_PPM_PAGE_SHIFT; |
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92 | size = CONFIG_VMM_KENTRY_SIZE << CONFIG_PPM_PAGE_SHIFT; |
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93 | |
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94 | vseg_kentry = vmm_create_vseg( process, |
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95 | VSEG_TYPE_CODE, |
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96 | base, |
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97 | size, |
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98 | 0, // file_offset unused |
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99 | 0, // file_size unused |
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100 | XPTR_NULL, // mapper_xp unused |
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101 | local_cxy ); |
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102 | |
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103 | if( vseg_kentry == NULL ) |
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104 | { |
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105 | printk("\n[ERROR] in %s : cannot register kentry vseg\n", __FUNCTION__ ); |
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106 | return -1; |
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107 | } |
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108 | |
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109 | vmm->kent_vpn_base = base; |
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110 | |
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111 | // register args vseg in VSL |
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112 | base = (CONFIG_VMM_KENTRY_BASE + |
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113 | CONFIG_VMM_KENTRY_SIZE ) << CONFIG_PPM_PAGE_SHIFT; |
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114 | size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT; |
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115 | |
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116 | vseg_args = vmm_create_vseg( process, |
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117 | VSEG_TYPE_DATA, |
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118 | base, |
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119 | size, |
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120 | 0, // file_offset unused |
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121 | 0, // file_size unused |
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122 | XPTR_NULL, // mapper_xp unused |
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123 | local_cxy ); |
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124 | |
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125 | if( vseg_args == NULL ) |
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126 | { |
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127 | printk("\n[ERROR] in %s : cannot register args vseg\n", __FUNCTION__ ); |
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128 | return -1; |
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129 | } |
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130 | |
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131 | vmm->args_vpn_base = base; |
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132 | |
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133 | // register the envs vseg in VSL |
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134 | base = (CONFIG_VMM_KENTRY_BASE + |
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135 | CONFIG_VMM_KENTRY_SIZE + |
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136 | CONFIG_VMM_ARGS_SIZE ) << CONFIG_PPM_PAGE_SHIFT; |
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137 | size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT; |
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138 | |
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139 | vseg_envs = vmm_create_vseg( process, |
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140 | VSEG_TYPE_DATA, |
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141 | base, |
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142 | size, |
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143 | 0, // file_offset unused |
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144 | 0, // file_size unused |
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145 | XPTR_NULL, // mapper_xp unused |
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146 | local_cxy ); |
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147 | |
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148 | if( vseg_envs == NULL ) |
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149 | { |
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150 | printk("\n[ERROR] in %s : cannot register envs vseg\n", __FUNCTION__ ); |
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151 | return -1; |
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152 | } |
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153 | |
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154 | vmm->envs_vpn_base = base; |
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155 | |
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156 | // create GPT (empty) |
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157 | error = hal_gpt_create( &vmm->gpt ); |
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158 | |
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159 | if( error ) |
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160 | printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ ); |
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161 | |
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162 | // initialize GPT (architecture specic) |
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163 | // (For TSAR, identity map the kentry_vseg) |
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164 | error = hal_vmm_init( vmm ); |
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165 | |
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166 | if( error ) |
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167 | printk("\n[ERROR] in %s : cannot initialize GPT\n", __FUNCTION__ ); |
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168 | |
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169 | // initialize STACK allocator |
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170 | vmm->stack_mgr.bitmap = 0; |
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171 | vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE; |
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172 | |
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173 | // initialize MMAP allocator |
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174 | vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE; |
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175 | vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE; |
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176 | vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE; |
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177 | uint32_t i; |
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178 | for( i = 0 ; i < 32 ; i++ ) list_root_init( &vmm->mmap_mgr.zombi_list[i] ); |
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179 | |
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180 | // initialize instrumentation counters |
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181 | vmm->pgfault_nr = 0; |
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182 | |
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183 | hal_fence(); |
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184 | |
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185 | #if DEBUG_VMM_INIT |
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186 | cycle = (uint32_t)hal_get_cycles(); |
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187 | if( DEBUG_VMM_INIT ) |
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188 | printk("\n[DBG] %s : thread %x exit for process %x / entry_point = %x / cycle %d\n", |
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189 | __FUNCTION__ , CURRENT_THREAD , process->pid , process->vmm.entry_point , cycle ); |
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190 | #endif |
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191 | |
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192 | return 0; |
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193 | |
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194 | } // end vmm_init() |
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195 | |
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196 | ////////////////////////////////////// |
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197 | void vmm_display( process_t * process, |
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198 | bool_t mapping ) |
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199 | { |
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200 | vmm_t * vmm = &process->vmm; |
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201 | gpt_t * gpt = &vmm->gpt; |
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202 | |
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203 | printk("\n***** VSL and GPT for process %x in cluster %x\n\n", |
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204 | process->pid , local_cxy ); |
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205 | |
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206 | // get lock protecting the vseg list |
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207 | remote_rwlock_rd_lock( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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208 | |
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209 | // scan the list of vsegs |
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210 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
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211 | xptr_t iter_xp; |
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212 | xptr_t vseg_xp; |
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213 | vseg_t * vseg; |
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214 | XLIST_FOREACH( root_xp , iter_xp ) |
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215 | { |
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216 | vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
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217 | vseg = GET_PTR( vseg_xp ); |
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218 | |
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219 | printk(" - %s : base = %X / size = %X / npages = %d\n", |
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220 | vseg_type_str( vseg->type ) , vseg->min , vseg->max - vseg->min , vseg->vpn_size ); |
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221 | |
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222 | if( mapping ) |
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223 | { |
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224 | vpn_t vpn; |
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225 | ppn_t ppn; |
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226 | uint32_t attr; |
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227 | vpn_t base = vseg->vpn_base; |
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228 | vpn_t size = vseg->vpn_size; |
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229 | for( vpn = base ; vpn < (base+size) ; vpn++ ) |
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230 | { |
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231 | hal_gpt_get_pte( gpt , vpn , &attr , &ppn ); |
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232 | if( attr & GPT_MAPPED ) |
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233 | { |
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234 | printk(" . vpn = %X / attr = %X / ppn = %X\n", vpn , attr , ppn ); |
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235 | } |
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236 | } |
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237 | } |
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238 | } |
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239 | |
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240 | // release the lock |
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241 | remote_rwlock_rd_unlock( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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242 | |
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243 | } // vmm_display() |
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244 | |
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245 | /////////////////////i////////////////////////// |
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246 | void vmm_global_update_pte( process_t * process, |
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247 | vpn_t vpn, |
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248 | uint32_t attr, |
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249 | ppn_t ppn ) |
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250 | { |
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251 | |
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252 | xlist_entry_t * process_root_ptr; |
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253 | xptr_t process_root_xp; |
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254 | xptr_t process_iter_xp; |
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255 | |
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256 | xptr_t remote_process_xp; |
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257 | cxy_t remote_process_cxy; |
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258 | process_t * remote_process_ptr; |
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259 | xptr_t remote_gpt_xp; |
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260 | |
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261 | pid_t pid; |
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262 | cxy_t owner_cxy; |
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263 | lpid_t owner_lpid; |
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264 | |
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265 | #if DEBUG_VMM_UPDATE_PTE |
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266 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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267 | if( DEBUG_VMM_UPDATE_PTE < cycle ) |
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268 | printk("\n[DBG] %s : thread %x enter for process %x / vpn %x / cycle %d\n", |
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269 | __FUNCTION__ , CURRENT_THREAD , process->pid , vpn , cycle ); |
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270 | #endif |
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271 | |
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272 | // check cluster is reference |
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273 | assert( (GET_CXY( process->ref_xp ) == local_cxy) , __FUNCTION__, |
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274 | "not called in reference cluster\n"); |
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275 | |
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276 | // get extended pointer on root of process copies xlist in owner cluster |
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277 | pid = process->pid; |
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278 | owner_cxy = CXY_FROM_PID( pid ); |
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279 | owner_lpid = LPID_FROM_PID( pid ); |
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280 | process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid]; |
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281 | process_root_xp = XPTR( owner_cxy , process_root_ptr ); |
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282 | |
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283 | // loop on destination process copies |
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284 | XLIST_FOREACH( process_root_xp , process_iter_xp ) |
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285 | { |
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286 | // get cluster and local pointer on remote process |
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287 | remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list ); |
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288 | remote_process_ptr = GET_PTR( remote_process_xp ); |
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289 | remote_process_cxy = GET_CXY( remote_process_xp ); |
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290 | |
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291 | #if (DEBUG_VMM_UPDATE_PTE & 0x1) |
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292 | if( DEBUG_VMM_UPDATE_PTE < cycle ) |
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293 | printk("\n[DBG] %s : thread %x handling process %x in cluster %x\n", |
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294 | __FUNCTION__ , CURRENT_THREAD , process->pid , remote_process_cxy ); |
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295 | #endif |
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296 | |
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297 | // get extended pointer on remote gpt |
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298 | remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt ); |
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299 | |
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300 | // update remote GPT |
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301 | hal_gpt_update_pte( remote_gpt_xp, vpn, attr, ppn ); |
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302 | } |
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303 | |
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304 | #if DEBUG_VMM_UPDATE_PTE |
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305 | cycle = (uint32_t)hal_get_cycles(); |
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306 | if( DEBUG_VMM_UPDATE_PTE < cycle ) |
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307 | printk("\n[DBG] %s : thread %x exit for process %x / vpn %x / cycle %d\n", |
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308 | __FUNCTION__ , CURRENT_THREAD , process->pid , vpn , cycle ); |
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309 | #endif |
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310 | |
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311 | } // end vmm_global_update_pte() |
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312 | |
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313 | /////////////////////////////////////// |
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314 | void vmm_set_cow( process_t * process ) |
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315 | { |
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316 | vmm_t * vmm; |
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317 | |
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318 | xlist_entry_t * process_root_ptr; |
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319 | xptr_t process_root_xp; |
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320 | xptr_t process_iter_xp; |
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321 | |
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322 | xptr_t remote_process_xp; |
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323 | cxy_t remote_process_cxy; |
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324 | process_t * remote_process_ptr; |
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325 | xptr_t remote_gpt_xp; |
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326 | |
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327 | xptr_t vseg_root_xp; |
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328 | xptr_t vseg_iter_xp; |
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329 | |
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330 | xptr_t vseg_xp; |
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331 | vseg_t * vseg; |
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332 | |
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333 | pid_t pid; |
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334 | cxy_t owner_cxy; |
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335 | lpid_t owner_lpid; |
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336 | |
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337 | #if DEBUG_VMM_SET_COW |
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338 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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339 | if( DEBUG_VMM_SET_COW < cycle ) |
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340 | printk("\n[DBG] %s : thread %x enter for process %x / cycle %d\n", |
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341 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
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342 | #endif |
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343 | |
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344 | // check cluster is reference |
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345 | assert( (GET_CXY( process->ref_xp ) == local_cxy) , __FUNCTION__, |
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346 | "local cluster is not process reference cluster\n"); |
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347 | |
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348 | // get pointer on reference VMM |
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349 | vmm = &process->vmm; |
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350 | |
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351 | // get extended pointer on root of process copies xlist in owner cluster |
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352 | pid = process->pid; |
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353 | owner_cxy = CXY_FROM_PID( pid ); |
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354 | owner_lpid = LPID_FROM_PID( pid ); |
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355 | process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid]; |
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356 | process_root_xp = XPTR( owner_cxy , process_root_ptr ); |
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357 | |
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358 | // get extended pointer on root of vsegs xlist from reference VMM |
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359 | vseg_root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
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360 | |
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361 | // loop on destination process copies |
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362 | XLIST_FOREACH( process_root_xp , process_iter_xp ) |
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363 | { |
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364 | // get cluster and local pointer on remote process |
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365 | remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list ); |
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366 | remote_process_ptr = GET_PTR( remote_process_xp ); |
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367 | remote_process_cxy = GET_CXY( remote_process_xp ); |
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368 | |
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369 | #if (DEBUG_VMM_SET_COW &0x1) |
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370 | if( DEBUG_VMM_SET_COW < cycle ) |
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371 | printk("\n[DBG] %s : thread %x handling process %x in cluster %x\n", |
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372 | __FUNCTION__ , CURRENT_THREAD , process->pid , remote_process_cxy ); |
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373 | #endif |
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374 | |
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375 | // get extended pointer on remote gpt |
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376 | remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt ); |
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377 | |
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378 | // loop on vsegs in (local) reference process VSL |
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379 | XLIST_FOREACH( vseg_root_xp , vseg_iter_xp ) |
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380 | { |
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381 | // get pointer on vseg |
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382 | vseg_xp = XLIST_ELEMENT( vseg_iter_xp , vseg_t , xlist ); |
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383 | vseg = GET_PTR( vseg_xp ); |
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384 | |
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385 | assert( (GET_CXY( vseg_xp ) == local_cxy) , __FUNCTION__, |
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386 | "all vsegs in reference VSL must be local\n" ); |
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387 | |
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388 | // get vseg type, base and size |
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389 | uint32_t type = vseg->type; |
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390 | vpn_t vpn_base = vseg->vpn_base; |
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391 | vpn_t vpn_size = vseg->vpn_size; |
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392 | |
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393 | #if (DEBUG_VMM_SET_COW & 0x1) |
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394 | if( DEBUG_VMM_SET_COW < cycle ) |
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395 | printk("\n[DBG] %s : thread %x handling vseg %s / vpn_base = %x / vpn_size = %x\n", |
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396 | __FUNCTION__, CURRENT_THREAD , vseg_type_str(type), vpn_base, vpn_size ); |
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397 | #endif |
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398 | // only DATA, ANON and REMOTE vsegs |
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399 | if( (type == VSEG_TYPE_DATA) || |
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400 | (type == VSEG_TYPE_ANON) || |
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401 | (type == VSEG_TYPE_REMOTE) ) |
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402 | { |
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403 | vpn_t vpn; |
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404 | uint32_t attr; |
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405 | ppn_t ppn; |
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406 | xptr_t page_xp; |
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407 | cxy_t page_cxy; |
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408 | page_t * page_ptr; |
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409 | xptr_t forks_xp; |
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410 | |
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411 | // update flags in remote GPT |
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412 | hal_gpt_set_cow( remote_gpt_xp, |
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413 | vpn_base, |
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414 | vpn_size ); |
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415 | |
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416 | // atomically increment pending forks counter in physical pages, |
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417 | // for all vseg pages that are mapped in reference cluster |
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418 | if( remote_process_cxy == local_cxy ) |
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419 | { |
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420 | // the reference GPT is the local GPT |
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421 | gpt_t * gpt = GET_PTR( remote_gpt_xp ); |
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422 | |
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423 | // scan all pages in vseg |
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424 | for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ ) |
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425 | { |
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426 | // get page attributes and PPN from reference GPT |
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427 | hal_gpt_get_pte( gpt , vpn , &attr , &ppn ); |
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428 | |
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429 | // atomically update pending forks counter if page is mapped |
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430 | if( attr & GPT_MAPPED ) |
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431 | { |
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432 | page_xp = ppm_ppn2page( ppn ); |
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433 | page_cxy = GET_CXY( page_xp ); |
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434 | page_ptr = GET_PTR( page_xp ); |
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435 | forks_xp = XPTR( page_cxy , &page_ptr->forks ); |
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436 | hal_remote_atomic_add( forks_xp , 1 ); |
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437 | } |
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438 | } // end loop on vpn |
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439 | } // end if local |
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440 | } // end if vseg type |
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441 | } // end loop on vsegs |
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442 | } // end loop on process copies |
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443 | |
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444 | #if DEBUG_VMM_SET_COW |
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445 | cycle = (uint32_t)hal_get_cycles(); |
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446 | if( DEBUG_VMM_SET_COW < cycle ) |
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447 | printk("\n[DBG] %s : thread %x exit for process %x / cycle %d\n", |
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448 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
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449 | #endif |
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450 | |
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451 | } // end vmm_set-cow() |
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452 | |
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453 | ///////////////////////////////////////////////// |
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454 | error_t vmm_fork_copy( process_t * child_process, |
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455 | xptr_t parent_process_xp ) |
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456 | { |
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457 | error_t error; |
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458 | cxy_t parent_cxy; |
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459 | process_t * parent_process; |
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460 | vmm_t * parent_vmm; |
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461 | xptr_t parent_lock_xp; |
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462 | vmm_t * child_vmm; |
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463 | xptr_t iter_xp; |
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464 | xptr_t parent_vseg_xp; |
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465 | vseg_t * parent_vseg; |
---|
466 | vseg_t * child_vseg; |
---|
467 | uint32_t type; |
---|
468 | bool_t cow; |
---|
469 | vpn_t vpn; |
---|
470 | vpn_t vpn_base; |
---|
471 | vpn_t vpn_size; |
---|
472 | xptr_t page_xp; |
---|
473 | page_t * page_ptr; |
---|
474 | cxy_t page_cxy; |
---|
475 | xptr_t parent_root_xp; |
---|
476 | bool_t mapped; |
---|
477 | ppn_t ppn; |
---|
478 | |
---|
479 | #if DEBUG_VMM_FORK_COPY |
---|
480 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
481 | if( DEBUG_VMM_FORK_COPY < cycle ) |
---|
482 | printk("\n[DBG] %s : thread %x enter / cycle %d\n", |
---|
483 | __FUNCTION__ , CURRENT_THREAD, cycle ); |
---|
484 | #endif |
---|
485 | |
---|
486 | // get parent process cluster and local pointer |
---|
487 | parent_cxy = GET_CXY( parent_process_xp ); |
---|
488 | parent_process = GET_PTR( parent_process_xp ); |
---|
489 | |
---|
490 | // get local pointers on parent and child VMM |
---|
491 | parent_vmm = &parent_process->vmm; |
---|
492 | child_vmm = &child_process->vmm; |
---|
493 | |
---|
494 | // get extended pointer on lock protecting the parent VSL |
---|
495 | parent_lock_xp = XPTR( parent_cxy , &parent_vmm->vsegs_lock ); |
---|
496 | |
---|
497 | // initialize the lock protecting the child VSL |
---|
498 | remote_rwlock_init( XPTR( local_cxy , &child_vmm->vsegs_lock ) ); |
---|
499 | |
---|
500 | // initialize the child VSL as empty |
---|
501 | xlist_root_init( XPTR( local_cxy, &child_vmm->vsegs_root ) ); |
---|
502 | child_vmm->vsegs_nr = 0; |
---|
503 | |
---|
504 | // create child GPT |
---|
505 | error = hal_gpt_create( &child_vmm->gpt ); |
---|
506 | |
---|
507 | if( error ) |
---|
508 | { |
---|
509 | printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ ); |
---|
510 | return -1; |
---|
511 | } |
---|
512 | |
---|
513 | // build extended pointer on parent VSL |
---|
514 | parent_root_xp = XPTR( parent_cxy , &parent_vmm->vsegs_root ); |
---|
515 | |
---|
516 | // take the lock protecting the parent VSL |
---|
517 | remote_rwlock_rd_lock( parent_lock_xp ); |
---|
518 | |
---|
519 | // loop on parent VSL xlist |
---|
520 | XLIST_FOREACH( parent_root_xp , iter_xp ) |
---|
521 | { |
---|
522 | // get local and extended pointers on current parent vseg |
---|
523 | parent_vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
---|
524 | parent_vseg = GET_PTR( parent_vseg_xp ); |
---|
525 | |
---|
526 | // get vseg type |
---|
527 | type = hal_remote_lw( XPTR( parent_cxy , &parent_vseg->type ) ); |
---|
528 | |
---|
529 | #if DEBUG_VMM_FORK_COPY |
---|
530 | cycle = (uint32_t)hal_get_cycles(); |
---|
531 | if( DEBUG_VMM_FORK_COPY < cycle ) |
---|
532 | printk("\n[DBG] %s : thread %x found parent vseg %s / vpn_base = %x / cycle %d\n", |
---|
533 | __FUNCTION__ , CURRENT_THREAD, vseg_type_str(type), |
---|
534 | hal_remote_lw( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle ); |
---|
535 | #endif |
---|
536 | |
---|
537 | // all parent vsegs - but STACK - must be copied in child VSL |
---|
538 | if( type != VSEG_TYPE_STACK ) |
---|
539 | { |
---|
540 | // allocate memory for a new child vseg |
---|
541 | child_vseg = vseg_alloc(); |
---|
542 | if( child_vseg == NULL ) // release all allocated vsegs |
---|
543 | { |
---|
544 | vmm_destroy( child_process ); |
---|
545 | printk("\n[ERROR] in %s : cannot create vseg for child\n", __FUNCTION__ ); |
---|
546 | return -1; |
---|
547 | } |
---|
548 | |
---|
549 | // copy parent vseg to child vseg |
---|
550 | vseg_init_from_ref( child_vseg , parent_vseg_xp ); |
---|
551 | |
---|
552 | // register child vseg in child VSL |
---|
553 | vseg_attach( child_vmm , child_vseg ); |
---|
554 | |
---|
555 | #if DEBUG_VMM_FORK_COPY |
---|
556 | cycle = (uint32_t)hal_get_cycles(); |
---|
557 | if( DEBUG_VMM_FORK_COPY < cycle ) |
---|
558 | printk("\n[DBG] %s : thread %x copied vseg %s / vpn_base = %x to child VSL / cycle %d\n", |
---|
559 | __FUNCTION__ , CURRENT_THREAD , vseg_type_str(type), |
---|
560 | hal_remote_lw( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle ); |
---|
561 | #endif |
---|
562 | |
---|
563 | // copy DATA, MMAP, REMOTE, FILE parent GPT entries to child GPT |
---|
564 | if( type != VSEG_TYPE_CODE ) |
---|
565 | { |
---|
566 | // activate the COW for DATA, MMAP, REMOTE vsegs only |
---|
567 | cow = ( type != VSEG_TYPE_FILE ); |
---|
568 | |
---|
569 | vpn_base = child_vseg->vpn_base; |
---|
570 | vpn_size = child_vseg->vpn_size; |
---|
571 | |
---|
572 | // scan pages in parent vseg |
---|
573 | for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ ) |
---|
574 | { |
---|
575 | error = hal_gpt_pte_copy( &child_vmm->gpt, |
---|
576 | XPTR( parent_cxy , &parent_vmm->gpt ), |
---|
577 | vpn, |
---|
578 | cow, |
---|
579 | &ppn, |
---|
580 | &mapped ); |
---|
581 | if( error ) |
---|
582 | { |
---|
583 | vmm_destroy( child_process ); |
---|
584 | printk("\n[ERROR] in %s : cannot copy GPT\n", __FUNCTION__ ); |
---|
585 | return -1; |
---|
586 | } |
---|
587 | |
---|
588 | // increment pending forks counter in page if mapped |
---|
589 | if( mapped ) |
---|
590 | { |
---|
591 | page_xp = ppm_ppn2page( ppn ); |
---|
592 | page_cxy = GET_CXY( page_xp ); |
---|
593 | page_ptr = GET_PTR( page_xp ); |
---|
594 | hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->forks ) , 1 ); |
---|
595 | |
---|
596 | #if DEBUG_VMM_FORK_COPY |
---|
597 | cycle = (uint32_t)hal_get_cycles(); |
---|
598 | if( DEBUG_VMM_FORK_COPY < cycle ) |
---|
599 | printk("\n[DBG] %s : thread %x copied vpn %x to child GPT / cycle %d\n", |
---|
600 | __FUNCTION__ , CURRENT_THREAD , vpn , cycle ); |
---|
601 | #endif |
---|
602 | |
---|
603 | } |
---|
604 | } |
---|
605 | } // end if no code & no stack |
---|
606 | } // end if no stack |
---|
607 | } // end loop on vsegs |
---|
608 | |
---|
609 | // release the parent vsegs lock |
---|
610 | remote_rwlock_rd_unlock( parent_lock_xp ); |
---|
611 | |
---|
612 | // initialize child GPT (architecture specic) |
---|
613 | // => For TSAR, identity map the kentry_vseg |
---|
614 | error = hal_vmm_init( child_vmm ); |
---|
615 | |
---|
616 | if( error ) |
---|
617 | { |
---|
618 | printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ ); |
---|
619 | return -1; |
---|
620 | } |
---|
621 | |
---|
622 | // initialize the child VMM STACK allocator |
---|
623 | child_vmm->stack_mgr.bitmap = 0; |
---|
624 | child_vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE; |
---|
625 | |
---|
626 | // initialize the child VMM MMAP allocator |
---|
627 | uint32_t i; |
---|
628 | child_vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE; |
---|
629 | child_vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE; |
---|
630 | child_vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE; |
---|
631 | for( i = 0 ; i < 32 ; i++ ) list_root_init( &child_vmm->mmap_mgr.zombi_list[i] ); |
---|
632 | |
---|
633 | // initialize instrumentation counters |
---|
634 | child_vmm->pgfault_nr = 0; |
---|
635 | |
---|
636 | // copy base addresses from parent VMM to child VMM |
---|
637 | child_vmm->kent_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->kent_vpn_base)); |
---|
638 | child_vmm->args_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->args_vpn_base)); |
---|
639 | child_vmm->envs_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->envs_vpn_base)); |
---|
640 | child_vmm->heap_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->heap_vpn_base)); |
---|
641 | child_vmm->code_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->code_vpn_base)); |
---|
642 | child_vmm->data_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->data_vpn_base)); |
---|
643 | |
---|
644 | child_vmm->entry_point = (intptr_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->entry_point)); |
---|
645 | |
---|
646 | hal_fence(); |
---|
647 | |
---|
648 | #if DEBUG_VMM_FORK_COPY |
---|
649 | cycle = (uint32_t)hal_get_cycles(); |
---|
650 | if( DEBUG_VMM_FORK_COPY < cycle ) |
---|
651 | printk("\n[DBG] %s : thread %x exit successfully / cycle %d\n", |
---|
652 | __FUNCTION__ , CURRENT_THREAD , cycle ); |
---|
653 | #endif |
---|
654 | |
---|
655 | return 0; |
---|
656 | |
---|
657 | } // vmm_fork_copy() |
---|
658 | |
---|
659 | /////////////////////////////////////// |
---|
660 | void vmm_destroy( process_t * process ) |
---|
661 | { |
---|
662 | xptr_t vseg_xp; |
---|
663 | vseg_t * vseg; |
---|
664 | |
---|
665 | #if DEBUG_VMM_DESTROY |
---|
666 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
667 | if( DEBUG_VMM_DESTROY < cycle ) |
---|
668 | printk("\n[DBG] %s : thread %x enter for process %x / cycle %d\n", |
---|
669 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
---|
670 | #endif |
---|
671 | |
---|
672 | #if (DEBUG_VMM_DESTROY & 1 ) |
---|
673 | vmm_display( process , true ); |
---|
674 | #endif |
---|
675 | |
---|
676 | // get pointer on local VMM |
---|
677 | vmm_t * vmm = &process->vmm; |
---|
678 | |
---|
679 | // get extended pointer on VSL root and VSL lock |
---|
680 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
---|
681 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
682 | |
---|
683 | // get lock protecting vseg list |
---|
684 | remote_rwlock_wr_lock( lock_xp ); |
---|
685 | |
---|
686 | // remove all user vsegs registered in VSL |
---|
687 | while( !xlist_is_empty( root_xp ) ) |
---|
688 | { |
---|
689 | // get pointer on first vseg in VSL |
---|
690 | vseg_xp = XLIST_FIRST_ELEMENT( root_xp , vseg_t , xlist ); |
---|
691 | vseg = GET_PTR( vseg_xp ); |
---|
692 | |
---|
693 | #if( DEBUG_VMM_DESTROY & 1 ) |
---|
694 | if( DEBUG_VMM_DESTROY < cycle ) |
---|
695 | printk("\n[DBG] %s : %s / vpn_base %x / vpn_size %d\n", |
---|
696 | __FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size ); |
---|
697 | #endif |
---|
698 | |
---|
699 | // unmap and release physical pages |
---|
700 | vmm_unmap_vseg( process , vseg ); |
---|
701 | |
---|
702 | // remove vseg from VSL |
---|
703 | vseg_detach( vmm , vseg ); |
---|
704 | |
---|
705 | // release memory allocated to vseg descriptor |
---|
706 | vseg_free( vseg ); |
---|
707 | } |
---|
708 | |
---|
709 | // release lock protecting VSL |
---|
710 | remote_rwlock_wr_unlock( lock_xp ); |
---|
711 | |
---|
712 | // remove all vsegs from zombi_lists in MMAP allocator |
---|
713 | uint32_t i; |
---|
714 | for( i = 0 ; i<32 ; i++ ) |
---|
715 | { |
---|
716 | while( !list_is_empty( &vmm->mmap_mgr.zombi_list[i] ) ) |
---|
717 | { |
---|
718 | vseg = LIST_FIRST( &vmm->mmap_mgr.zombi_list[i] , vseg_t , zlist ); |
---|
719 | vseg_detach( vmm , vseg ); |
---|
720 | vseg_free( vseg ); |
---|
721 | } |
---|
722 | } |
---|
723 | |
---|
724 | // release memory allocated to the GPT itself |
---|
725 | hal_gpt_destroy( &vmm->gpt ); |
---|
726 | |
---|
727 | #if DEBUG_VMM_DESTROY |
---|
728 | cycle = (uint32_t)hal_get_cycles(); |
---|
729 | if( DEBUG_VMM_DESTROY < cycle ) |
---|
730 | printk("\n[DBG] %s : thread %x exit / cycle %d\n", |
---|
731 | __FUNCTION__ , CURRENT_THREAD , cycle ); |
---|
732 | #endif |
---|
733 | |
---|
734 | } // end vmm_destroy() |
---|
735 | |
---|
736 | ///////////////////////////////////////////////// |
---|
737 | vseg_t * vmm_check_conflict( process_t * process, |
---|
738 | vpn_t vpn_base, |
---|
739 | vpn_t vpn_size ) |
---|
740 | { |
---|
741 | vmm_t * vmm = &process->vmm; |
---|
742 | |
---|
743 | // scan the VSL |
---|
744 | vseg_t * vseg; |
---|
745 | xptr_t iter_xp; |
---|
746 | xptr_t vseg_xp; |
---|
747 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
---|
748 | |
---|
749 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
750 | { |
---|
751 | vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
---|
752 | vseg = GET_PTR( vseg_xp ); |
---|
753 | |
---|
754 | if( ((vpn_base + vpn_size) > vseg->vpn_base) && |
---|
755 | (vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg; |
---|
756 | } |
---|
757 | return NULL; |
---|
758 | |
---|
759 | } // end vmm_check_conflict() |
---|
760 | |
---|
761 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
762 | // This static function is called by the vmm_create_vseg() function, and implements |
---|
763 | // the VMM stack_vseg specific allocator. |
---|
764 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
765 | // @ vmm : pointer on VMM. |
---|
766 | // @ vpn_base : (return value) first allocated page |
---|
767 | // @ vpn_size : (return value) number of allocated pages |
---|
768 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
769 | static error_t vmm_stack_alloc( vmm_t * vmm, |
---|
770 | vpn_t * vpn_base, |
---|
771 | vpn_t * vpn_size ) |
---|
772 | { |
---|
773 | // get stack allocator pointer |
---|
774 | stack_mgr_t * mgr = &vmm->stack_mgr; |
---|
775 | |
---|
776 | // get lock on stack allocator |
---|
777 | spinlock_lock( &mgr->lock ); |
---|
778 | |
---|
779 | // get first free slot index in bitmap |
---|
780 | int32_t index = bitmap_ffc( &mgr->bitmap , 4 ); |
---|
781 | if( (index < 0) || (index > 31) ) |
---|
782 | { |
---|
783 | spinlock_unlock( &mgr->lock ); |
---|
784 | return ENOMEM; |
---|
785 | } |
---|
786 | |
---|
787 | // update bitmap |
---|
788 | bitmap_set( &mgr->bitmap , index ); |
---|
789 | |
---|
790 | // release lock on stack allocator |
---|
791 | spinlock_unlock( &mgr->lock ); |
---|
792 | |
---|
793 | // returns vpn_base, vpn_size (one page non allocated) |
---|
794 | *vpn_base = mgr->vpn_base + index * CONFIG_VMM_STACK_SIZE + 1; |
---|
795 | *vpn_size = CONFIG_VMM_STACK_SIZE - 1; |
---|
796 | return 0; |
---|
797 | |
---|
798 | } // end vmm_stack_alloc() |
---|
799 | |
---|
800 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
801 | // This static function is called by the vmm_create_vseg() function, and implements |
---|
802 | // the VMM MMAP specific allocator. |
---|
803 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
804 | // @ vmm : [in] pointer on VMM. |
---|
805 | // @ npages : [in] requested number of pages. |
---|
806 | // @ vpn_base : [out] first allocated page. |
---|
807 | // @ vpn_size : [out] actual number of allocated pages. |
---|
808 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
809 | static error_t vmm_mmap_alloc( vmm_t * vmm, |
---|
810 | vpn_t npages, |
---|
811 | vpn_t * vpn_base, |
---|
812 | vpn_t * vpn_size ) |
---|
813 | { |
---|
814 | uint32_t index; |
---|
815 | vseg_t * vseg; |
---|
816 | vpn_t base; |
---|
817 | vpn_t size; |
---|
818 | vpn_t free; |
---|
819 | |
---|
820 | // mmap vseg size must be power of 2 |
---|
821 | // compute actual size and index in zombi_list array |
---|
822 | size = POW2_ROUNDUP( npages ); |
---|
823 | index = bits_log2( size ); |
---|
824 | |
---|
825 | // get mmap allocator pointer |
---|
826 | mmap_mgr_t * mgr = &vmm->mmap_mgr; |
---|
827 | |
---|
828 | // get lock on mmap allocator |
---|
829 | spinlock_lock( &mgr->lock ); |
---|
830 | |
---|
831 | // get vseg from zombi_list or from mmap zone |
---|
832 | if( list_is_empty( &mgr->zombi_list[index] ) ) // from mmap zone |
---|
833 | { |
---|
834 | // check overflow |
---|
835 | free = mgr->first_free_vpn; |
---|
836 | if( (free + size) > mgr->vpn_size ) return ENOMEM; |
---|
837 | |
---|
838 | // update STACK allocator |
---|
839 | mgr->first_free_vpn += size; |
---|
840 | |
---|
841 | // compute base |
---|
842 | base = free; |
---|
843 | } |
---|
844 | else // from zombi_list |
---|
845 | { |
---|
846 | // get pointer on zombi vseg from zombi_list |
---|
847 | vseg = LIST_FIRST( &mgr->zombi_list[index] , vseg_t , zlist ); |
---|
848 | |
---|
849 | // remove vseg from free-list |
---|
850 | list_unlink( &vseg->zlist ); |
---|
851 | |
---|
852 | // compute base |
---|
853 | base = vseg->vpn_base; |
---|
854 | } |
---|
855 | |
---|
856 | // release lock on mmap allocator |
---|
857 | spinlock_unlock( &mgr->lock ); |
---|
858 | |
---|
859 | // returns vpn_base, vpn_size |
---|
860 | *vpn_base = base; |
---|
861 | *vpn_size = size; |
---|
862 | return 0; |
---|
863 | |
---|
864 | } // end vmm_mmap_alloc() |
---|
865 | |
---|
866 | //////////////////////////////////////////////// |
---|
867 | vseg_t * vmm_create_vseg( process_t * process, |
---|
868 | vseg_type_t type, |
---|
869 | intptr_t base, |
---|
870 | uint32_t size, |
---|
871 | uint32_t file_offset, |
---|
872 | uint32_t file_size, |
---|
873 | xptr_t mapper_xp, |
---|
874 | cxy_t cxy ) |
---|
875 | { |
---|
876 | vseg_t * vseg; // created vseg pointer |
---|
877 | vpn_t vpn_base; // first page index |
---|
878 | vpn_t vpn_size; // number of pages |
---|
879 | error_t error; |
---|
880 | |
---|
881 | #if DEBUG_VMM_CREATE_VSEG |
---|
882 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
883 | if( DEBUG_VMM_CREATE_VSEG < cycle ) |
---|
884 | printk("\n[DBG] %s : thread %x enter / process %x / base %x / size %x / %s / cxy %x / cycle %d\n", |
---|
885 | __FUNCTION__, CURRENT_THREAD, process->pid, base, size, vseg_type_str(type), cxy, cycle ); |
---|
886 | #endif |
---|
887 | |
---|
888 | // get pointer on VMM |
---|
889 | vmm_t * vmm = &process->vmm; |
---|
890 | |
---|
891 | // compute base, size, vpn_base, vpn_size, depending on vseg type |
---|
892 | // we use the VMM specific allocators for "stack", "file", "anon", & "remote" vsegs |
---|
893 | if( type == VSEG_TYPE_STACK ) |
---|
894 | { |
---|
895 | // get vpn_base and vpn_size from STACK allocator |
---|
896 | error = vmm_stack_alloc( vmm , &vpn_base , &vpn_size ); |
---|
897 | if( error ) |
---|
898 | { |
---|
899 | printk("\n[ERROR] in %s : no space for stack vseg / process %x in cluster %x\n", |
---|
900 | __FUNCTION__ , process->pid , local_cxy ); |
---|
901 | return NULL; |
---|
902 | } |
---|
903 | |
---|
904 | // compute vseg base and size from vpn_base and vpn_size |
---|
905 | base = vpn_base << CONFIG_PPM_PAGE_SHIFT; |
---|
906 | size = vpn_size << CONFIG_PPM_PAGE_SHIFT; |
---|
907 | } |
---|
908 | else if( (type == VSEG_TYPE_ANON) || |
---|
909 | (type == VSEG_TYPE_FILE) || |
---|
910 | (type == VSEG_TYPE_REMOTE) ) |
---|
911 | { |
---|
912 | // get vpn_base and vpn_size from MMAP allocator |
---|
913 | vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT; |
---|
914 | error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size ); |
---|
915 | if( error ) |
---|
916 | { |
---|
917 | printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n", |
---|
918 | __FUNCTION__ , process->pid , local_cxy ); |
---|
919 | return NULL; |
---|
920 | } |
---|
921 | |
---|
922 | // compute vseg base and size from vpn_base and vpn_size |
---|
923 | base = vpn_base << CONFIG_PPM_PAGE_SHIFT; |
---|
924 | size = vpn_size << CONFIG_PPM_PAGE_SHIFT; |
---|
925 | } |
---|
926 | else |
---|
927 | { |
---|
928 | uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT; |
---|
929 | uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
930 | |
---|
931 | vpn_base = vpn_min; |
---|
932 | vpn_size = vpn_max - vpn_min + 1; |
---|
933 | } |
---|
934 | |
---|
935 | // check collisions |
---|
936 | vseg = vmm_check_conflict( process , vpn_base , vpn_size ); |
---|
937 | if( vseg != NULL ) |
---|
938 | { |
---|
939 | printk("\n[ERROR] in %s for process %x : new vseg [vpn_base = %x / vpn_size = %x]\n" |
---|
940 | " overlap existing vseg [vpn_base = %x / vpn_size = %x]\n", |
---|
941 | __FUNCTION__ , process->pid, vpn_base, vpn_size, vseg->vpn_base, vseg->vpn_size ); |
---|
942 | return NULL; |
---|
943 | } |
---|
944 | |
---|
945 | // allocate physical memory for vseg descriptor |
---|
946 | vseg = vseg_alloc(); |
---|
947 | if( vseg == NULL ) |
---|
948 | { |
---|
949 | printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n", |
---|
950 | __FUNCTION__ , process->pid ); |
---|
951 | return NULL; |
---|
952 | } |
---|
953 | |
---|
954 | // initialize vseg descriptor |
---|
955 | vseg_init( vseg, |
---|
956 | type, |
---|
957 | base, |
---|
958 | size, |
---|
959 | vpn_base, |
---|
960 | vpn_size, |
---|
961 | file_offset, |
---|
962 | file_size, |
---|
963 | mapper_xp, |
---|
964 | cxy ); |
---|
965 | |
---|
966 | // attach vseg to VSL |
---|
967 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
968 | remote_rwlock_wr_lock( lock_xp ); |
---|
969 | vseg_attach( vmm , vseg ); |
---|
970 | remote_rwlock_wr_unlock( lock_xp ); |
---|
971 | |
---|
972 | #if DEBUG_VMM_CREATE_VSEG |
---|
973 | cycle = (uint32_t)hal_get_cycles(); |
---|
974 | if( DEBUG_VMM_CREATE_VSEG < cycle ) |
---|
975 | printk("\n[DBG] %s : thread %x exit / process %x / %s / cxy %x / cycle %d\n", |
---|
976 | __FUNCTION__, CURRENT_THREAD, process->pid, vseg_type_str(type), cxy, cycle ); |
---|
977 | #endif |
---|
978 | |
---|
979 | return vseg; |
---|
980 | |
---|
981 | } // vmm_create_vseg() |
---|
982 | |
---|
983 | ///////////////////////////////////// |
---|
984 | void vmm_remove_vseg( vseg_t * vseg ) |
---|
985 | { |
---|
986 | // get pointers on calling process and VMM |
---|
987 | thread_t * this = CURRENT_THREAD; |
---|
988 | process_t * process = this->process; |
---|
989 | vmm_t * vmm = &this->process->vmm; |
---|
990 | uint32_t type = vseg->type; |
---|
991 | |
---|
992 | // detach vseg from VSL |
---|
993 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
994 | remote_rwlock_wr_lock( lock_xp ); |
---|
995 | vseg_detach( &process->vmm , vseg ); |
---|
996 | remote_rwlock_wr_unlock( lock_xp ); |
---|
997 | |
---|
998 | // release the stack slot to VMM stack allocator if STACK type |
---|
999 | if( type == VSEG_TYPE_STACK ) |
---|
1000 | { |
---|
1001 | // get pointer on stack allocator |
---|
1002 | stack_mgr_t * mgr = &vmm->stack_mgr; |
---|
1003 | |
---|
1004 | // compute slot index |
---|
1005 | uint32_t index = ((vseg->vpn_base - mgr->vpn_base - 1) / CONFIG_VMM_STACK_SIZE); |
---|
1006 | |
---|
1007 | // update stacks_bitmap |
---|
1008 | spinlock_lock( &mgr->lock ); |
---|
1009 | bitmap_clear( &mgr->bitmap , index ); |
---|
1010 | spinlock_unlock( &mgr->lock ); |
---|
1011 | } |
---|
1012 | |
---|
1013 | // release the vseg to VMM mmap allocator if MMAP type |
---|
1014 | if( (type == VSEG_TYPE_ANON) || (type == VSEG_TYPE_FILE) || (type == VSEG_TYPE_REMOTE) ) |
---|
1015 | { |
---|
1016 | // get pointer on mmap allocator |
---|
1017 | mmap_mgr_t * mgr = &vmm->mmap_mgr; |
---|
1018 | |
---|
1019 | // compute zombi_list index |
---|
1020 | uint32_t index = bits_log2( vseg->vpn_size ); |
---|
1021 | |
---|
1022 | // update zombi_list |
---|
1023 | spinlock_lock( &mgr->lock ); |
---|
1024 | list_add_first( &mgr->zombi_list[index] , &vseg->zlist ); |
---|
1025 | spinlock_unlock( &mgr->lock ); |
---|
1026 | } |
---|
1027 | |
---|
1028 | // release physical memory allocated for vseg descriptor if no MMAP type |
---|
1029 | if( (type != VSEG_TYPE_ANON) && (type != VSEG_TYPE_FILE) && (type != VSEG_TYPE_REMOTE) ) |
---|
1030 | { |
---|
1031 | vseg_free( vseg ); |
---|
1032 | } |
---|
1033 | } // end vmm_remove_vseg() |
---|
1034 | |
---|
1035 | ///////////////////////////////////////// |
---|
1036 | void vmm_unmap_vseg( process_t * process, |
---|
1037 | vseg_t * vseg ) |
---|
1038 | { |
---|
1039 | vpn_t vpn; // VPN of current PTE |
---|
1040 | vpn_t vpn_min; // VPN of first PTE |
---|
1041 | vpn_t vpn_max; // VPN of last PTE (excluded) |
---|
1042 | ppn_t ppn; // current PTE ppn value |
---|
1043 | uint32_t attr; // current PTE attributes |
---|
1044 | kmem_req_t req; // request to release memory |
---|
1045 | xptr_t page_xp; // extended pointer on page descriptor |
---|
1046 | cxy_t page_cxy; // page descriptor cluster |
---|
1047 | page_t * page_ptr; // page descriptor pointer |
---|
1048 | xptr_t forks_xp; // extended pointer on pending forks counter |
---|
1049 | uint32_t count; // actual number of pendinf forks |
---|
1050 | |
---|
1051 | #if DEBUG_VMM_UNMAP_VSEG |
---|
1052 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1053 | if( DEBUG_VMM_UNMAP_VSEG < cycle ) |
---|
1054 | printk("\n[DBG] %s : thread %x enter / process %x / vseg %s / base %x / cycle %d\n", |
---|
1055 | __FUNCTION__, CURRENT_THREAD, process->pid, vseg_type_str( vseg->type ), vseg->vpn_base, cycle ); |
---|
1056 | #endif |
---|
1057 | |
---|
1058 | // get pointer on local GPT |
---|
1059 | gpt_t * gpt = &process->vmm.gpt; |
---|
1060 | |
---|
1061 | // loop on pages in vseg |
---|
1062 | vpn_min = vseg->vpn_base; |
---|
1063 | vpn_max = vpn_min + vseg->vpn_size; |
---|
1064 | for( vpn = vpn_min ; vpn < vpn_max ; vpn++ ) |
---|
1065 | { |
---|
1066 | // get GPT entry |
---|
1067 | hal_gpt_get_pte( gpt , vpn , &attr , &ppn ); |
---|
1068 | |
---|
1069 | if( attr & GPT_MAPPED ) // entry is mapped |
---|
1070 | { |
---|
1071 | |
---|
1072 | #if( DEBUG_VMM_UNMAP_VSEG & 1 ) |
---|
1073 | if( DEBUG_VMM_UNMAP_VSEG < cycle ) |
---|
1074 | printk("- vpn %x / ppn %x\n" , vpn , ppn ); |
---|
1075 | #endif |
---|
1076 | |
---|
1077 | // check small page |
---|
1078 | assert( (attr & GPT_SMALL) , __FUNCTION__ , |
---|
1079 | "an user vseg must use small pages" ); |
---|
1080 | |
---|
1081 | // unmap GPT entry in all GPT copies |
---|
1082 | hal_gpt_reset_pte( gpt , vpn ); |
---|
1083 | |
---|
1084 | // handle pending forks counter if |
---|
1085 | // 1) not identity mapped |
---|
1086 | // 2) running in reference cluster |
---|
1087 | if( ((vseg->flags & VSEG_IDENT) == 0) && |
---|
1088 | (GET_CXY( process->ref_xp ) == local_cxy) ) |
---|
1089 | { |
---|
1090 | // get extended pointer on physical page descriptor |
---|
1091 | page_xp = ppm_ppn2page( ppn ); |
---|
1092 | page_cxy = GET_CXY( page_xp ); |
---|
1093 | page_ptr = GET_PTR( page_xp ); |
---|
1094 | |
---|
1095 | // FIXME lock the physical page |
---|
1096 | |
---|
1097 | // get pending forks counter |
---|
1098 | count = hal_remote_lw( XPTR( page_cxy , &page_ptr->forks ) ); |
---|
1099 | |
---|
1100 | if( count ) // decrement pending forks counter |
---|
1101 | { |
---|
1102 | forks_xp = XPTR( page_cxy , &page_ptr->forks ); |
---|
1103 | hal_remote_atomic_add( forks_xp , -1 ); |
---|
1104 | } |
---|
1105 | else // release physical page to relevant cluster |
---|
1106 | { |
---|
1107 | if( page_cxy == local_cxy ) // local cluster |
---|
1108 | { |
---|
1109 | req.type = KMEM_PAGE; |
---|
1110 | req.ptr = page_ptr; |
---|
1111 | kmem_free( &req ); |
---|
1112 | } |
---|
1113 | else // remote cluster |
---|
1114 | { |
---|
1115 | rpc_pmem_release_pages_client( page_cxy , page_ptr ); |
---|
1116 | } |
---|
1117 | } |
---|
1118 | |
---|
1119 | // FIXME unlock the physical page |
---|
1120 | } |
---|
1121 | } |
---|
1122 | } |
---|
1123 | |
---|
1124 | #if DEBUG_VMM_UNMAP_VSEG |
---|
1125 | cycle = (uint32_t)hal_get_cycles(); |
---|
1126 | if( DEBUG_VMM_UNMAP_VSEG < cycle ) |
---|
1127 | printk("\n[DBG] %s : thread %x exit / process %x / vseg %s / base %x / cycle %d\n", |
---|
1128 | __FUNCTION__, CURRENT_THREAD, process->pid, vseg_type_str( vseg->type ), vseg->vpn_base, cycle ); |
---|
1129 | #endif |
---|
1130 | |
---|
1131 | } // end vmm_unmap_vseg() |
---|
1132 | |
---|
1133 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1134 | // This low-level static function is called by the vmm_get_vseg(), vmm_get_pte(), |
---|
1135 | // and vmm_resize_vseg() functions. It scan the local VSL to find the unique vseg |
---|
1136 | // containing a given virtual address. |
---|
1137 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1138 | // @ vmm : pointer on the process VMM. |
---|
1139 | // @ vaddr : virtual address. |
---|
1140 | // @ return vseg pointer if success / return NULL if not found. |
---|
1141 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
1142 | static vseg_t * vseg_from_vaddr( vmm_t * vmm, |
---|
1143 | intptr_t vaddr ) |
---|
1144 | { |
---|
1145 | xptr_t iter_xp; |
---|
1146 | xptr_t vseg_xp; |
---|
1147 | vseg_t * vseg; |
---|
1148 | |
---|
1149 | // get extended pointers on VSL lock and root |
---|
1150 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
1151 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
---|
1152 | |
---|
1153 | // get lock protecting the VSL |
---|
1154 | remote_rwlock_rd_lock( lock_xp ); |
---|
1155 | |
---|
1156 | // scan the list of vsegs in VSL |
---|
1157 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
1158 | { |
---|
1159 | vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
---|
1160 | vseg = GET_PTR( vseg_xp ); |
---|
1161 | if( (vaddr >= vseg->min) && (vaddr < vseg->max) ) |
---|
1162 | { |
---|
1163 | // return success |
---|
1164 | remote_rwlock_rd_unlock( lock_xp ); |
---|
1165 | return vseg; |
---|
1166 | } |
---|
1167 | } |
---|
1168 | |
---|
1169 | // return failure |
---|
1170 | remote_rwlock_rd_unlock( lock_xp ); |
---|
1171 | return NULL; |
---|
1172 | |
---|
1173 | } // end vseg_from_vaddr() |
---|
1174 | |
---|
1175 | ///////////////////////////////////////////// |
---|
1176 | error_t vmm_resize_vseg( process_t * process, |
---|
1177 | intptr_t base, |
---|
1178 | intptr_t size ) |
---|
1179 | { |
---|
1180 | error_t error; |
---|
1181 | vseg_t * new; |
---|
1182 | vpn_t vpn_min; |
---|
1183 | vpn_t vpn_max; |
---|
1184 | |
---|
1185 | // get pointer on process VMM |
---|
1186 | vmm_t * vmm = &process->vmm; |
---|
1187 | |
---|
1188 | intptr_t addr_min = base; |
---|
1189 | intptr_t addr_max = base + size; |
---|
1190 | |
---|
1191 | // get pointer on vseg |
---|
1192 | vseg_t * vseg = vseg_from_vaddr( vmm , base ); |
---|
1193 | |
---|
1194 | if( vseg == NULL) return EINVAL; |
---|
1195 | |
---|
1196 | // get extended pointer on VSL lock |
---|
1197 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
1198 | |
---|
1199 | // get lock protecting VSL |
---|
1200 | remote_rwlock_wr_lock( lock_xp ); |
---|
1201 | |
---|
1202 | if( (vseg->min > addr_min) || (vseg->max < addr_max) ) // region not included in vseg |
---|
1203 | { |
---|
1204 | error = EINVAL; |
---|
1205 | } |
---|
1206 | else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be removed |
---|
1207 | { |
---|
1208 | vmm_remove_vseg( vseg ); |
---|
1209 | error = 0; |
---|
1210 | } |
---|
1211 | else if( vseg->min == addr_min ) // vseg must be resized |
---|
1212 | { |
---|
1213 | // update vseg base address |
---|
1214 | vseg->min = addr_max; |
---|
1215 | |
---|
1216 | // update vpn_base and vpn_size |
---|
1217 | vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT; |
---|
1218 | vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
1219 | vseg->vpn_base = vpn_min; |
---|
1220 | vseg->vpn_size = vpn_max - vpn_min + 1; |
---|
1221 | error = 0; |
---|
1222 | } |
---|
1223 | else if( vseg->max == addr_max ) // vseg must be resized |
---|
1224 | { |
---|
1225 | // update vseg max address |
---|
1226 | vseg->max = addr_min; |
---|
1227 | |
---|
1228 | // update vpn_base and vpn_size |
---|
1229 | vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT; |
---|
1230 | vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
1231 | vseg->vpn_base = vpn_min; |
---|
1232 | vseg->vpn_size = vpn_max - vpn_min + 1; |
---|
1233 | error = 0; |
---|
1234 | } |
---|
1235 | else // vseg cut in three regions |
---|
1236 | { |
---|
1237 | // resize existing vseg |
---|
1238 | vseg->max = addr_min; |
---|
1239 | |
---|
1240 | // update vpn_base and vpn_size |
---|
1241 | vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT; |
---|
1242 | vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
1243 | vseg->vpn_base = vpn_min; |
---|
1244 | vseg->vpn_size = vpn_max - vpn_min + 1; |
---|
1245 | |
---|
1246 | // create new vseg |
---|
1247 | new = vmm_create_vseg( process, |
---|
1248 | vseg->type, |
---|
1249 | addr_min, |
---|
1250 | (vseg->max - addr_max), |
---|
1251 | vseg->file_offset, |
---|
1252 | vseg->file_size, |
---|
1253 | vseg->mapper_xp, |
---|
1254 | vseg->cxy ); |
---|
1255 | |
---|
1256 | if( new == NULL ) error = EINVAL; |
---|
1257 | else error = 0; |
---|
1258 | } |
---|
1259 | |
---|
1260 | // release VMM lock |
---|
1261 | remote_rwlock_wr_unlock( lock_xp ); |
---|
1262 | |
---|
1263 | return error; |
---|
1264 | |
---|
1265 | } // vmm_resize_vseg() |
---|
1266 | |
---|
1267 | /////////////////////////////////////////// |
---|
1268 | error_t vmm_get_vseg( process_t * process, |
---|
1269 | intptr_t vaddr, |
---|
1270 | vseg_t ** found_vseg ) |
---|
1271 | { |
---|
1272 | xptr_t vseg_xp; |
---|
1273 | error_t error; |
---|
1274 | vseg_t * vseg; |
---|
1275 | vmm_t * vmm; |
---|
1276 | |
---|
1277 | // get pointer on local VMM |
---|
1278 | vmm = &process->vmm; |
---|
1279 | |
---|
1280 | // try to get vseg from local VMM |
---|
1281 | vseg = vseg_from_vaddr( vmm , vaddr ); |
---|
1282 | |
---|
1283 | if( vseg == NULL ) // vseg not found in local cluster => try to get it from ref |
---|
1284 | { |
---|
1285 | // get extended pointer on reference process |
---|
1286 | xptr_t ref_xp = process->ref_xp; |
---|
1287 | |
---|
1288 | // get cluster and local pointer on reference process |
---|
1289 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
---|
1290 | process_t * ref_ptr = GET_PTR( ref_xp ); |
---|
1291 | |
---|
1292 | if( local_cxy == ref_cxy ) return -1; // local cluster is the reference |
---|
1293 | |
---|
1294 | // get extended pointer on reference vseg |
---|
1295 | rpc_vmm_get_vseg_client( ref_cxy , ref_ptr , vaddr , &vseg_xp , &error ); |
---|
1296 | |
---|
1297 | if( error ) return -1; // vseg not found => illegal user vaddr |
---|
1298 | |
---|
1299 | // allocate a vseg in local cluster |
---|
1300 | vseg = vseg_alloc(); |
---|
1301 | |
---|
1302 | if( vseg == NULL ) return -1; // cannot allocate a local vseg |
---|
1303 | |
---|
1304 | // initialise local vseg from reference |
---|
1305 | vseg_init_from_ref( vseg , vseg_xp ); |
---|
1306 | |
---|
1307 | // register local vseg in local VMM |
---|
1308 | vseg_attach( &process->vmm , vseg ); |
---|
1309 | } |
---|
1310 | |
---|
1311 | // success |
---|
1312 | *found_vseg = vseg; |
---|
1313 | return 0; |
---|
1314 | |
---|
1315 | } // end vmm_get_vseg() |
---|
1316 | |
---|
1317 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
1318 | // This static function compute the target cluster to allocate a physical page |
---|
1319 | // for a given <vpn> in a given <vseg>, allocates the page (with an RPC if required) |
---|
1320 | // and returns an extended pointer on the allocated page descriptor. |
---|
1321 | // The vseg cannot have the FILE type. |
---|
1322 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
1323 | static xptr_t vmm_page_allocate( vseg_t * vseg, |
---|
1324 | vpn_t vpn ) |
---|
1325 | { |
---|
1326 | |
---|
1327 | #if DEBUG_VMM_ALLOCATE_PAGE |
---|
1328 | if( DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() ) |
---|
1329 | printk("\n[DBG] in %s : thread %x enter for vpn %x\n", |
---|
1330 | __FUNCTION__ , CURRENT_THREAD, vpn ); |
---|
1331 | #endif |
---|
1332 | |
---|
1333 | // compute target cluster |
---|
1334 | page_t * page_ptr; |
---|
1335 | cxy_t page_cxy; |
---|
1336 | kmem_req_t req; |
---|
1337 | |
---|
1338 | uint32_t type = vseg->type; |
---|
1339 | uint32_t flags = vseg->flags; |
---|
1340 | |
---|
1341 | assert( ( type != VSEG_TYPE_FILE ) , __FUNCTION__ , "illegal vseg type\n" ); |
---|
1342 | |
---|
1343 | if( flags & VSEG_DISTRIB ) // distributed => cxy depends on vpn LSB |
---|
1344 | { |
---|
1345 | uint32_t x_size = LOCAL_CLUSTER->x_size; |
---|
1346 | uint32_t y_size = LOCAL_CLUSTER->y_size; |
---|
1347 | uint32_t y_width = LOCAL_CLUSTER->y_width; |
---|
1348 | uint32_t index = vpn & ((x_size * y_size) - 1); |
---|
1349 | uint32_t x = index / y_size; |
---|
1350 | uint32_t y = index % y_size; |
---|
1351 | page_cxy = (x<<y_width) + y; |
---|
1352 | } |
---|
1353 | else // other cases => cxy specified in vseg |
---|
1354 | { |
---|
1355 | page_cxy = vseg->cxy; |
---|
1356 | } |
---|
1357 | |
---|
1358 | // allocate a physical page from target cluster |
---|
1359 | if( page_cxy == local_cxy ) // target cluster is the local cluster |
---|
1360 | { |
---|
1361 | req.type = KMEM_PAGE; |
---|
1362 | req.size = 0; |
---|
1363 | req.flags = AF_NONE; |
---|
1364 | page_ptr = (page_t *)kmem_alloc( &req ); |
---|
1365 | } |
---|
1366 | else // target cluster is not the local cluster |
---|
1367 | { |
---|
1368 | rpc_pmem_get_pages_client( page_cxy , 0 , &page_ptr ); |
---|
1369 | } |
---|
1370 | |
---|
1371 | #if DEBUG_VMM_ALLOCATE_PAGE |
---|
1372 | if( DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() ) |
---|
1373 | printk("\n[DBG] in %s : thread %x exit for vpn = %d / ppn = %x\n", |
---|
1374 | __FUNCTION__ , CURRENT_THREAD, vpn, ppm_page2ppn( XPTR( page_cxy , page_ptr ) ) ); |
---|
1375 | #endif |
---|
1376 | |
---|
1377 | if( page_ptr == NULL ) return XPTR_NULL; |
---|
1378 | else return XPTR( page_cxy , page_ptr ); |
---|
1379 | |
---|
1380 | } // end vmm_page_allocate() |
---|
1381 | |
---|
1382 | //////////////////////////////////////// |
---|
1383 | error_t vmm_get_one_ppn( vseg_t * vseg, |
---|
1384 | vpn_t vpn, |
---|
1385 | ppn_t * ppn ) |
---|
1386 | { |
---|
1387 | error_t error; |
---|
1388 | xptr_t page_xp; // extended pointer on physical page descriptor |
---|
1389 | page_t * page_ptr; // local pointer on physical page descriptor |
---|
1390 | uint32_t index; // missing page index in vseg mapper |
---|
1391 | uint32_t type; // vseg type; |
---|
1392 | |
---|
1393 | type = vseg->type; |
---|
1394 | index = vpn - vseg->vpn_base; |
---|
1395 | |
---|
1396 | #if DEBUG_VMM_GET_ONE_PPN |
---|
1397 | thread_t * this = CURRENT_THREAD; |
---|
1398 | // if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
1399 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1400 | printk("\n[DBG] %s : thread %x enter for vpn = %x / type = %s / index = %d\n", |
---|
1401 | __FUNCTION__, this, vpn, vseg_type_str(type), index ); |
---|
1402 | #endif |
---|
1403 | |
---|
1404 | // FILE type : get the physical page from the file mapper |
---|
1405 | if( type == VSEG_TYPE_FILE ) |
---|
1406 | { |
---|
1407 | // get extended pointer on mapper |
---|
1408 | xptr_t mapper_xp = vseg->mapper_xp; |
---|
1409 | |
---|
1410 | assert( (mapper_xp != XPTR_NULL), __FUNCTION__, |
---|
1411 | "mapper not defined for a FILE vseg\n" ); |
---|
1412 | |
---|
1413 | // get mapper cluster and local pointer |
---|
1414 | cxy_t mapper_cxy = GET_CXY( mapper_xp ); |
---|
1415 | mapper_t * mapper_ptr = GET_PTR( mapper_xp ); |
---|
1416 | |
---|
1417 | // get page descriptor from mapper |
---|
1418 | if( mapper_cxy == local_cxy ) // mapper is local |
---|
1419 | { |
---|
1420 | page_ptr = mapper_get_page( mapper_ptr , index ); |
---|
1421 | } |
---|
1422 | else // mapper is remote |
---|
1423 | { |
---|
1424 | rpc_mapper_get_page_client( mapper_cxy , mapper_ptr , index , &page_ptr ); |
---|
1425 | } |
---|
1426 | |
---|
1427 | if ( page_ptr == NULL ) return EINVAL; |
---|
1428 | |
---|
1429 | page_xp = XPTR( mapper_cxy , page_ptr ); |
---|
1430 | } |
---|
1431 | |
---|
1432 | // Other types : allocate a physical page from target cluster, |
---|
1433 | // as defined by vseg type and vpn value |
---|
1434 | else |
---|
1435 | { |
---|
1436 | // allocate one physical page |
---|
1437 | page_xp = vmm_page_allocate( vseg , vpn ); |
---|
1438 | |
---|
1439 | if( page_xp == XPTR_NULL ) return ENOMEM; |
---|
1440 | |
---|
1441 | // initialise missing page from .elf file mapper for DATA and CODE types |
---|
1442 | // the vseg->mapper_xp field is an extended pointer on the .elf file mapper |
---|
1443 | if( (type == VSEG_TYPE_CODE) || (type == VSEG_TYPE_DATA) ) |
---|
1444 | { |
---|
1445 | // get extended pointer on mapper |
---|
1446 | xptr_t mapper_xp = vseg->mapper_xp; |
---|
1447 | |
---|
1448 | assert( (mapper_xp != XPTR_NULL), __FUNCTION__, |
---|
1449 | "mapper not defined for a CODE or DATA vseg\n" ); |
---|
1450 | |
---|
1451 | // get mapper cluster and local pointer |
---|
1452 | cxy_t mapper_cxy = GET_CXY( mapper_xp ); |
---|
1453 | mapper_t * mapper_ptr = GET_PTR( mapper_xp ); |
---|
1454 | |
---|
1455 | // compute missing page offset in vseg |
---|
1456 | uint32_t offset = index << CONFIG_PPM_PAGE_SHIFT; |
---|
1457 | |
---|
1458 | // compute missing page offset in .elf file |
---|
1459 | uint32_t elf_offset = vseg->file_offset + offset; |
---|
1460 | |
---|
1461 | #if (DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
1462 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1463 | // if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
1464 | printk("\n[DBG] %s : thread %x for vpn = %x / elf_offset = %x\n", |
---|
1465 | __FUNCTION__, this, vpn, elf_offset ); |
---|
1466 | #endif |
---|
1467 | |
---|
1468 | |
---|
1469 | // compute extended pointer on page base |
---|
1470 | xptr_t base_xp = ppm_page2base( page_xp ); |
---|
1471 | |
---|
1472 | // file_size (in .elf mapper) can be smaller than vseg_size (BSS) |
---|
1473 | uint32_t file_size = vseg->file_size; |
---|
1474 | |
---|
1475 | if( file_size < offset ) // missing page fully in BSS |
---|
1476 | { |
---|
1477 | |
---|
1478 | #if (DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
1479 | // if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
1480 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1481 | printk("\n[DBG] %s : thread%x for vpn = %x / fully in BSS\n", |
---|
1482 | __FUNCTION__, this, vpn ); |
---|
1483 | #endif |
---|
1484 | |
---|
1485 | |
---|
1486 | if( GET_CXY( page_xp ) == local_cxy ) |
---|
1487 | { |
---|
1488 | memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE ); |
---|
1489 | } |
---|
1490 | else |
---|
1491 | { |
---|
1492 | hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE ); |
---|
1493 | } |
---|
1494 | } |
---|
1495 | else if( file_size >= (offset + CONFIG_PPM_PAGE_SIZE) ) // fully in mapper |
---|
1496 | { |
---|
1497 | |
---|
1498 | #if (DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
1499 | // if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
1500 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1501 | printk("\n[DBG] %s : thread %x, for vpn = %x / fully in mapper\n", |
---|
1502 | __FUNCTION__, this, vpn ); |
---|
1503 | #endif |
---|
1504 | if( mapper_cxy == local_cxy ) |
---|
1505 | { |
---|
1506 | error = mapper_move_kernel( mapper_ptr, |
---|
1507 | true, // to_buffer |
---|
1508 | elf_offset, |
---|
1509 | base_xp, |
---|
1510 | CONFIG_PPM_PAGE_SIZE ); |
---|
1511 | } |
---|
1512 | else |
---|
1513 | { |
---|
1514 | rpc_mapper_move_buffer_client( mapper_cxy, |
---|
1515 | mapper_ptr, |
---|
1516 | true, // to buffer |
---|
1517 | false, // kernel buffer |
---|
1518 | elf_offset, |
---|
1519 | base_xp, |
---|
1520 | CONFIG_PPM_PAGE_SIZE, |
---|
1521 | &error ); |
---|
1522 | } |
---|
1523 | if( error ) return EINVAL; |
---|
1524 | } |
---|
1525 | else // both in mapper and in BSS : |
---|
1526 | // - (file_size - offset) bytes from mapper |
---|
1527 | // - (page_size + offset - file_size) bytes from BSS |
---|
1528 | { |
---|
1529 | |
---|
1530 | #if (DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
1531 | // if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
1532 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1533 | printk("\n[DBG] %s : thread %x for vpn = %x / both mapper & BSS\n" |
---|
1534 | " %d bytes from mapper / %d bytes from BSS\n", |
---|
1535 | __FUNCTION__, this, vpn, |
---|
1536 | file_size - offset , offset + CONFIG_PPM_PAGE_SIZE - file_size ); |
---|
1537 | #endif |
---|
1538 | // initialize mapper part |
---|
1539 | if( mapper_cxy == local_cxy ) |
---|
1540 | { |
---|
1541 | error = mapper_move_kernel( mapper_ptr, |
---|
1542 | true, // to buffer |
---|
1543 | elf_offset, |
---|
1544 | base_xp, |
---|
1545 | file_size - offset ); |
---|
1546 | } |
---|
1547 | else |
---|
1548 | { |
---|
1549 | rpc_mapper_move_buffer_client( mapper_cxy, |
---|
1550 | mapper_ptr, |
---|
1551 | true, // to buffer |
---|
1552 | false, // kernel buffer |
---|
1553 | elf_offset, |
---|
1554 | base_xp, |
---|
1555 | file_size - offset, |
---|
1556 | &error ); |
---|
1557 | } |
---|
1558 | if( error ) return EINVAL; |
---|
1559 | |
---|
1560 | // initialize BSS part |
---|
1561 | if( GET_CXY( page_xp ) == local_cxy ) |
---|
1562 | { |
---|
1563 | memset( GET_PTR( base_xp ) + file_size - offset , 0 , |
---|
1564 | offset + CONFIG_PPM_PAGE_SIZE - file_size ); |
---|
1565 | } |
---|
1566 | else |
---|
1567 | { |
---|
1568 | hal_remote_memset( base_xp + file_size - offset , 0 , |
---|
1569 | offset + CONFIG_PPM_PAGE_SIZE - file_size ); |
---|
1570 | } |
---|
1571 | } |
---|
1572 | } // end initialisation for CODE or DATA types |
---|
1573 | } |
---|
1574 | |
---|
1575 | // return ppn |
---|
1576 | *ppn = ppm_page2ppn( page_xp ); |
---|
1577 | |
---|
1578 | #if DEBUG_VMM_GET_ONE_PPN |
---|
1579 | // if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
1580 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1581 | printk("\n[DBG] %s : thread %x exit for vpn = %x / ppn = %x\n", |
---|
1582 | __FUNCTION__ , this , vpn , *ppn ); |
---|
1583 | #endif |
---|
1584 | |
---|
1585 | return 0; |
---|
1586 | |
---|
1587 | } // end vmm_get_one_ppn() |
---|
1588 | |
---|
1589 | ///////////////////////////////////////// |
---|
1590 | error_t vmm_get_pte( process_t * process, |
---|
1591 | vpn_t vpn, |
---|
1592 | bool_t cow, |
---|
1593 | uint32_t * attr, |
---|
1594 | ppn_t * ppn ) |
---|
1595 | { |
---|
1596 | ppn_t old_ppn; // current PTE_PPN |
---|
1597 | uint32_t old_attr; // current PTE_ATTR |
---|
1598 | ppn_t new_ppn; // new PTE_PPN |
---|
1599 | uint32_t new_attr; // new PTE_ATTR |
---|
1600 | vmm_t * vmm; |
---|
1601 | vseg_t * vseg; |
---|
1602 | error_t error; |
---|
1603 | |
---|
1604 | thread_t * this = CURRENT_THREAD; |
---|
1605 | |
---|
1606 | #if DEBUG_VMM_GET_PTE |
---|
1607 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1608 | // if( DEBUG_VMM_GET_PTE < cycle ) |
---|
1609 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1610 | printk("\n[DBG] %s : thread %x enter / vpn %x / process %x / cow %d / cycle %d\n", |
---|
1611 | __FUNCTION__ , this , vpn , process->pid , cow , cycle ); |
---|
1612 | #endif |
---|
1613 | |
---|
1614 | // get VMM pointer |
---|
1615 | vmm = &process->vmm; |
---|
1616 | |
---|
1617 | // get local vseg descriptor |
---|
1618 | error = vmm_get_vseg( process, |
---|
1619 | ((intptr_t)vpn << CONFIG_PPM_PAGE_SHIFT), |
---|
1620 | &vseg ); |
---|
1621 | |
---|
1622 | // vseg has been checked by the vmm_handle_page_fault() function |
---|
1623 | assert( (vseg != NULL) , __FUNCTION__, |
---|
1624 | "vseg undefined / vpn %x / thread %x / process %x / core[%x,%d] / cycle %d\n", |
---|
1625 | vpn, this, process->pid, local_cxy, this->core->lid, |
---|
1626 | (uint32_t)hal_get_cycles() ); |
---|
1627 | |
---|
1628 | if( cow ) //////////////// copy_on_write request ////////////////////// |
---|
1629 | // get PTE from local GPT |
---|
1630 | // allocate a new physical page if there is pending forks, |
---|
1631 | // initialize it from old physical page content, |
---|
1632 | // update PTE in all GPT copies, |
---|
1633 | { |
---|
1634 | // access local GPT to get current PTE attributes and PPN |
---|
1635 | hal_gpt_get_pte( &vmm->gpt , vpn , &old_attr , &old_ppn ); |
---|
1636 | |
---|
1637 | assert( (old_attr & GPT_MAPPED), __FUNCTION__, |
---|
1638 | "PTE unmapped for a COW exception / vpn %x / thread %x / process %x / cycle %d\n", |
---|
1639 | vpn, this, process->pid, (uint32_t)hal_get_cycles() ); |
---|
1640 | |
---|
1641 | #if( DEBUG_VMM_GET_PTE & 1 ) |
---|
1642 | // if( DEBUG_VMM_GET_PTE < cycle ) |
---|
1643 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1644 | printk("\n[DBG] %s : thread %x handling COW for vpn %x in process %x\n", |
---|
1645 | __FUNCTION__, this, vpn, process->pid ); |
---|
1646 | #endif |
---|
1647 | |
---|
1648 | // get extended pointer, cluster and local pointer on physical page descriptor |
---|
1649 | xptr_t page_xp = ppm_ppn2page( old_ppn ); |
---|
1650 | cxy_t page_cxy = GET_CXY( page_xp ); |
---|
1651 | page_t * page_ptr = GET_PTR( page_xp ); |
---|
1652 | |
---|
1653 | // get number of pending forks in page descriptor |
---|
1654 | uint32_t forks = hal_remote_lw( XPTR( page_cxy , &page_ptr->forks ) ); |
---|
1655 | |
---|
1656 | if( forks ) // pending fork => allocate a new page, copy old to new |
---|
1657 | { |
---|
1658 | // allocate a new physical page |
---|
1659 | page_xp = vmm_page_allocate( vseg , vpn ); |
---|
1660 | if( page_xp == XPTR_NULL ) |
---|
1661 | { |
---|
1662 | printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n", |
---|
1663 | __FUNCTION__ , process->pid , vpn ); |
---|
1664 | return -1; |
---|
1665 | } |
---|
1666 | |
---|
1667 | // compute allocated page PPN |
---|
1668 | new_ppn = ppm_page2ppn( page_xp ); |
---|
1669 | |
---|
1670 | // copy old page content to new page |
---|
1671 | xptr_t old_base_xp = ppm_ppn2base( old_ppn ); |
---|
1672 | xptr_t new_base_xp = ppm_ppn2base( new_ppn ); |
---|
1673 | memcpy( GET_PTR( new_base_xp ), |
---|
1674 | GET_PTR( old_base_xp ), |
---|
1675 | CONFIG_PPM_PAGE_SIZE ); |
---|
1676 | } |
---|
1677 | else // no pending fork => keep the existing page, reset COW |
---|
1678 | { |
---|
1679 | new_ppn = old_ppn; |
---|
1680 | } |
---|
1681 | |
---|
1682 | // build new_attr : reset COW and set WRITABLE, |
---|
1683 | new_attr = (old_attr | GPT_WRITABLE) & (~GPT_COW); |
---|
1684 | |
---|
1685 | // update GPT[vpn] for all GPT copies |
---|
1686 | vmm_global_update_pte( process, vpn, new_attr, new_ppn ); |
---|
1687 | |
---|
1688 | // decrement pending forks counter in page descriptor |
---|
1689 | hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->forks ) , -1 ); |
---|
1690 | } |
---|
1691 | else //////////// page_fault request /////////////////////////// |
---|
1692 | // get PTE from local GPT |
---|
1693 | // allocate a physical page if it is a true page fault, |
---|
1694 | // initialize it if type is FILE, CODE, or DATA, |
---|
1695 | // register in reference GPT, but don't update GPT copies |
---|
1696 | { |
---|
1697 | // access local GPT to get current PTE |
---|
1698 | hal_gpt_get_pte( &vmm->gpt , vpn , &old_attr , &old_ppn ); |
---|
1699 | |
---|
1700 | if( (old_attr & GPT_MAPPED) == 0 ) // true page_fault => map it |
---|
1701 | { |
---|
1702 | |
---|
1703 | #if( DEBUG_VMM_GET_PTE & 1 ) |
---|
1704 | // if( DEBUG_VMM_GET_PTE < cycle ) |
---|
1705 | if( (vpn == 0x403) && ((local_cxy == 0) || (this->type == THREAD_RPC)) ) |
---|
1706 | printk("\n[DBG] %s : thread %x handling page fault for vpn %x in process %x\n", |
---|
1707 | __FUNCTION__, this, vpn, process->pid ); |
---|
1708 | #endif |
---|
1709 | // allocate new_ppn, and initialize the new page |
---|
1710 | error = vmm_get_one_ppn( vseg , vpn , &new_ppn ); |
---|
1711 | if( error ) |
---|
1712 | { |
---|
1713 | printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n", |
---|
1714 | __FUNCTION__ , process->pid , vpn ); |
---|
1715 | return -1; |
---|
1716 | } |
---|
1717 | |
---|
1718 | // define new_attr from vseg flags |
---|
1719 | new_attr = GPT_MAPPED | GPT_SMALL; |
---|
1720 | if( vseg->flags & VSEG_USER ) new_attr |= GPT_USER; |
---|
1721 | if( vseg->flags & VSEG_WRITE ) new_attr |= GPT_WRITABLE; |
---|
1722 | if( vseg->flags & VSEG_EXEC ) new_attr |= GPT_EXECUTABLE; |
---|
1723 | if( vseg->flags & VSEG_CACHE ) new_attr |= GPT_CACHABLE; |
---|
1724 | |
---|
1725 | // register new PTE in reference GPT |
---|
1726 | // on demand policy => no update of GPT copies |
---|
1727 | error = hal_gpt_set_pte( &vmm->gpt, |
---|
1728 | vpn, |
---|
1729 | new_attr, |
---|
1730 | new_ppn ); |
---|
1731 | if( error ) |
---|
1732 | { |
---|
1733 | printk("\n[ERROR] in %s : cannot update GPT / process = %x / vpn = %x\n", |
---|
1734 | __FUNCTION__ , process->pid , vpn ); |
---|
1735 | return -1; |
---|
1736 | } |
---|
1737 | } |
---|
1738 | else // mapped in reference GPT => get it |
---|
1739 | { |
---|
1740 | new_ppn = old_ppn; |
---|
1741 | new_attr = old_attr; |
---|
1742 | } |
---|
1743 | } |
---|
1744 | |
---|
1745 | #if DEBUG_VMM_GET_PTE |
---|
1746 | cycle = (uint32_t)hal_get_cycles(); |
---|
1747 | // if( DEBUG_VMM_GET_PTE < cycle ) |
---|
1748 | if( (vpn == 0x403) && (local_cxy == 0) ) |
---|
1749 | printk("\n[DBG] %s : thread %x exit / vpn %x in process %x / ppn %x / attr %x / cycle %d\n", |
---|
1750 | __FUNCTION__, this, vpn, process->pid, new_ppn, new_attr, cycle ); |
---|
1751 | #endif |
---|
1752 | |
---|
1753 | // return PPN and flags |
---|
1754 | *ppn = new_ppn; |
---|
1755 | *attr = new_attr; |
---|
1756 | return 0; |
---|
1757 | |
---|
1758 | } // end vmm_get_pte() |
---|
1759 | |
---|
1760 | /////////////////////////////////////////////////// |
---|
1761 | error_t vmm_handle_page_fault( process_t * process, |
---|
1762 | vpn_t vpn, |
---|
1763 | bool_t is_cow ) |
---|
1764 | { |
---|
1765 | uint32_t attr; // missing page attributes |
---|
1766 | ppn_t ppn; // missing page PPN |
---|
1767 | vseg_t * vseg; // vseg containing vpn |
---|
1768 | uint32_t type; // vseg type |
---|
1769 | cxy_t ref_cxy; // reference cluster for missing vpn |
---|
1770 | process_t * ref_ptr; // reference process for missing vpn |
---|
1771 | error_t error; |
---|
1772 | |
---|
1773 | thread_t * this = CURRENT_THREAD; |
---|
1774 | |
---|
1775 | #if DEBUG_VMM_HANDLE_PAGE_FAULT |
---|
1776 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
1777 | // if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle ) |
---|
1778 | if( (vpn == 0x403) && (local_cxy == 0) ) |
---|
1779 | printk("\n[DBG] %s : thread %x in process %x enter for vpn %x / core[%x,%d] / cycle %d\n", |
---|
1780 | __FUNCTION__, this, process->pid, vpn, local_cxy, this->core->lid, cycle ); |
---|
1781 | #endif |
---|
1782 | |
---|
1783 | // get local vseg (access reference VSL if required) |
---|
1784 | error = vmm_get_vseg( process , vpn<<CONFIG_PPM_PAGE_SHIFT , &vseg ); |
---|
1785 | |
---|
1786 | if( error ) |
---|
1787 | { |
---|
1788 | printk("\n[ERROR] in %s : vpn %x / process %x / thread %x / core[%x,%d] / cycle %d\n", |
---|
1789 | __FUNCTION__, vpn, process->pid, this->trdid, local_cxy, this->core->lid, |
---|
1790 | (uint32_t)hal_get_cycles() ); |
---|
1791 | return error; |
---|
1792 | } |
---|
1793 | |
---|
1794 | // get segment type |
---|
1795 | type = vseg->type; |
---|
1796 | |
---|
1797 | // get reference process cluster and local pointer |
---|
1798 | // for private vsegs (CODE and DATA type), |
---|
1799 | // the reference is the local process descriptor. |
---|
1800 | if( (type == VSEG_TYPE_STACK) || (type == VSEG_TYPE_CODE) ) |
---|
1801 | { |
---|
1802 | ref_cxy = local_cxy; |
---|
1803 | ref_ptr = process; |
---|
1804 | } |
---|
1805 | else |
---|
1806 | { |
---|
1807 | ref_cxy = GET_CXY( process->ref_xp ); |
---|
1808 | ref_ptr = GET_PTR( process->ref_xp ); |
---|
1809 | } |
---|
1810 | |
---|
1811 | // get missing PTE attributes and PPN |
---|
1812 | if( local_cxy != ref_cxy ) |
---|
1813 | { |
---|
1814 | |
---|
1815 | #if DEBUG_VMM_HANDLE_PAGE_FAULT |
---|
1816 | // if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle ) |
---|
1817 | if( (vpn == 0x403) && (local_cxy == 0) ) |
---|
1818 | printk("\n[DBG] %s : thread %x in process %x call RPC_VMM_GET_PTE\n", |
---|
1819 | __FUNCTION__, this, process->pid ); |
---|
1820 | #endif |
---|
1821 | |
---|
1822 | rpc_vmm_get_pte_client( ref_cxy, |
---|
1823 | ref_ptr, |
---|
1824 | vpn, |
---|
1825 | is_cow, |
---|
1826 | &attr, |
---|
1827 | &ppn, |
---|
1828 | &error ); |
---|
1829 | |
---|
1830 | // get local VMM pointer |
---|
1831 | vmm_t * vmm = &process->vmm; |
---|
1832 | |
---|
1833 | // update local GPT |
---|
1834 | error |= hal_gpt_set_pte( &vmm->gpt, |
---|
1835 | vpn, |
---|
1836 | attr, |
---|
1837 | ppn ); |
---|
1838 | } |
---|
1839 | else // local cluster is the reference cluster |
---|
1840 | { |
---|
1841 | error = vmm_get_pte( process, |
---|
1842 | vpn, |
---|
1843 | is_cow, |
---|
1844 | &attr, |
---|
1845 | &ppn ); |
---|
1846 | } |
---|
1847 | |
---|
1848 | #if DEBUG_VMM_HANDLE_PAGE_FAULT |
---|
1849 | cycle = (uint32_t)hal_get_cycles(); |
---|
1850 | // if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle ) |
---|
1851 | if( (vpn == 0x403) && (local_cxy == 0) ) |
---|
1852 | printk("\n[DBG] %s : thread %x in process %x exit for vpn %x / core[%x,%d] / cycle %d\n", |
---|
1853 | __FUNCTION__, this, process->pid, vpn, local_cxy, this->core->lid, cycle ); |
---|
1854 | #endif |
---|
1855 | |
---|
1856 | return error; |
---|
1857 | |
---|
1858 | } // end vmm_handle_page_fault() |
---|
1859 | |
---|
1860 | |
---|
1861 | |
---|
1862 | |
---|
1863 | |
---|
1864 | |
---|
1865 | |
---|
1866 | |
---|
1867 | |
---|
1868 | /* deprecated April 2018 [AG] |
---|
1869 | |
---|
1870 | error_t vmm_v2p_translate( process_t * process, |
---|
1871 | void * ptr, |
---|
1872 | paddr_t * paddr ) |
---|
1873 | { |
---|
1874 | // access page table |
---|
1875 | error_t error; |
---|
1876 | vpn_t vpn; |
---|
1877 | uint32_t attr; |
---|
1878 | ppn_t ppn; |
---|
1879 | uint32_t offset; |
---|
1880 | |
---|
1881 | vpn = (vpn_t)( (intptr_t)ptr >> CONFIG_PPM_PAGE_SHIFT ); |
---|
1882 | offset = (uint32_t)( ((intptr_t)ptr) & CONFIG_PPM_PAGE_MASK ); |
---|
1883 | |
---|
1884 | if( local_cxy == GET_CXY( process->ref_xp) ) // local process is reference process |
---|
1885 | { |
---|
1886 | error = vmm_get_pte( process, vpn , false , &attr , &ppn ); |
---|
1887 | } |
---|
1888 | else // calling process is not reference process |
---|
1889 | { |
---|
1890 | cxy_t ref_cxy = GET_CXY( process->ref_xp ); |
---|
1891 | process_t * ref_ptr = GET_PTR( process->ref_xp ); |
---|
1892 | rpc_vmm_get_pte_client( ref_cxy , ref_ptr , vpn , false , &attr , &ppn , &error ); |
---|
1893 | } |
---|
1894 | |
---|
1895 | // set paddr |
---|
1896 | *paddr = (((paddr_t)ppn) << CONFIG_PPM_PAGE_SHIFT) | offset; |
---|
1897 | |
---|
1898 | return error; |
---|
1899 | |
---|
1900 | } // end vmm_v2p_translate() |
---|
1901 | |
---|
1902 | */ |
---|