1 | /* |
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2 | * ppm.h - Per-cluster Physical Pages Manager Interface |
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3 | * |
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4 | * Authors Ghassan Almaless (2008,2009,2010,2011,2012) |
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5 | * Alain Greiner (2016) |
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6 | * |
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7 | * Copyright (c) UPMC Sorbonne Universites |
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8 | * |
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9 | * This file is part of ALMOS-MKH. |
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10 | * |
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11 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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12 | * under the terms of the GNU General Public License as published by |
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13 | * the Free Software Foundation; version 2.0 of the License. |
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14 | * |
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15 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |
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25 | #ifndef _PPM_H_ |
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26 | #define _PPM_H_ |
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27 | |
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28 | #include <hal_types.h> |
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29 | #include <list.h> |
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30 | #include <spinlock.h> |
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31 | #include <boot_info.h> |
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32 | #include <page.h> |
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33 | |
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34 | |
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35 | /***************************************************************************************** |
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36 | * This structure defines the Physical Memory Manager in a cluster. |
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37 | * In all clusters, the physical memory bank starts at local physical address 0. |
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38 | * The size of this local physical memory is defined by the <pages_nr> field in the |
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39 | * boot_info structure. It is split in three parts: |
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40 | * - the "kernel_code" section contains the kernel code, loaded by the boot-loader. |
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41 | * It starts at PPN = 0 and the size is defined by the <pages_offset> field in the |
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42 | * boot_info structure. |
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43 | * - the "pages_tbl" section contains the physical page descriptors array. It starts |
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44 | * at PPN = pages_offset, and it contains one entry per small physical page in cluster. |
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45 | * It is created and initialized by the hal_ppm_create() function. "the |
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46 | * - The "kernel_heap" section contains all physical pages that are are not in the |
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47 | * in the kernel_code and pages_tbl sections, and that have not been reserved by the |
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48 | * architecture specific bootloader. The reserved pages are defined in the boot_info |
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49 | * structure. |
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50 | * |
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51 | * The main service provided by the PMM is the dynamic allocation of physical pages |
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52 | * from the "kernel_heap" section. |
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53 | * This low-level allocator implements the buddy algorithm: an allocated block is |
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54 | * an integer number n of 4 Kbytes pages, and n (called order) is a power of 2. |
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55 | ****************************************************************************************/ |
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56 | |
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57 | typedef struct ppm_s |
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58 | { |
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59 | spinlock_t free_lock; /*! lock protecting free_pages[] lists */ |
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60 | list_entry_t free_pages_root[CONFIG_PPM_MAX_ORDER]; /*! roots of free lists */ |
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61 | uint32_t free_pages_nr[CONFIG_PPM_MAX_ORDER]; /*! numbers of free pages */ |
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62 | page_t * pages_tbl; /*! pointer on page descriptors array */ |
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63 | uint32_t pages_nr; /*! total number of small physical page */ |
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64 | spinlock_t dirty_lock; /*! lock protecting the dirty pages list */ |
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65 | list_entry_t dirty_root; /*! root of dirty pages list */ |
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66 | void * vaddr_base; /*! pointer on local physical memory base */ |
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67 | } |
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68 | ppm_t; |
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69 | |
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70 | /***************************************************************************************** |
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71 | * This is the low-level physical pages allocation function. |
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72 | * It allocates N contiguous physical pages. N is a power of 2. |
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73 | * In normal use, you don't need to call it directly, as the recommended way to get |
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74 | * physical pages is to call the generic allocator defined in kmem.h. |
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75 | ***************************************************************************************** |
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76 | * @ order : ln2( number of 4 Kbytes pages) |
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77 | * @ returns a pointer on the page descriptor if success / NULL otherwise |
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78 | **************************************************************************************à))**/ |
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79 | page_t * ppm_alloc_pages( uint32_t order ); |
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80 | |
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81 | /***************************************************************************************** |
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82 | * This is the low-level physical pages release function. It takes the lock protecting |
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83 | * the free_list before register the released page in the relevant free_list. |
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84 | * In normal use, you do not need to call it directly, as the recommended way to free |
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85 | * physical pages is to call the generic allocator defined in kmem.h. |
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86 | ***************************************************************************************** |
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87 | * @ page : pointer to the page descriptor to be released |
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88 | ****************************************************************************************/ |
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89 | void ppm_free_pages( page_t * page ); |
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90 | |
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91 | /***************************************************************************************** |
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92 | * This function does the same as the ppm_free_page() function, without taking the lock. |
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93 | * It is used by the hal_ppm_init() function to initialize the pages_tbl[] array, when |
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94 | * there is no concurrent access issue. |
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95 | ***************************************************************************************** |
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96 | * @ page : pointer to the page descriptor to be released |
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97 | ****************************************************************************************/ |
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98 | void ppm_free_pages_nolock( page_t * page ); |
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99 | |
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100 | /***************************************************************************************** |
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101 | * This function check if a page descriptor pointer is valid. |
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102 | ***************************************************************************************** |
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103 | * @ page : pointer on a page descriptor |
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104 | * @ returns true if valid / false otherwise. |
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105 | ****************************************************************************************/ |
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106 | inline bool_t ppm_page_is_valid( page_t * page ); |
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107 | |
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108 | |
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109 | |
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110 | /***************************************************************************************** |
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111 | * Get extended pointer on page base from extended pointer on page descriptor. |
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112 | ***************************************************************************************** |
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113 | * @ page_xp : extended pointer to page descriptor |
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114 | * @ returns extended pointer on page base. |
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115 | ****************************************************************************************/ |
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116 | inline xptr_t ppm_page2base( xptr_t page_xp ); |
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117 | |
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118 | /***************************************************************************************** |
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119 | * Get extended pointer on page descriptor from extended pointer on page base. |
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120 | ***************************************************************************************** |
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121 | * @ base_xp : extended pointer to page base. |
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122 | * @ returns extended pointer on page descriptor |
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123 | ****************************************************************************************/ |
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124 | inline xptr_t ppm_base2page( xptr_t base_xp ); |
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125 | |
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126 | |
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127 | |
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128 | /***************************************************************************************** |
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129 | * Get extended pointer on page base from Global PPN. |
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130 | ***************************************************************************************** |
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131 | * @ ppn : global physical page number. |
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132 | * @ returns extended pointer on page base. |
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133 | ****************************************************************************************/ |
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134 | inline xptr_t ppm_ppn2base( ppn_t ppn ); |
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135 | |
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136 | /***************************************************************************************** |
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137 | * Get global PPN from extended pointer on page base. |
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138 | ***************************************************************************************** |
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139 | * @ base_xp : extended pointer to page base. |
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140 | * @ returns global physical page number. |
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141 | ****************************************************************************************/ |
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142 | inline ppn_t ppm_base2ppn( xptr_t base_xp ); |
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143 | |
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144 | |
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145 | |
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146 | /***************************************************************************************** |
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147 | * Get global PPN from extended pointer on page descriptor. |
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148 | ***************************************************************************************** |
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149 | * @ page_xp : pointer to page descriptor |
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150 | * @ returns global physical page number. |
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151 | ****************************************************************************************/ |
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152 | inline ppn_t ppm_page2ppn( xptr_t page_xp ); |
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153 | |
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154 | /***************************************************************************************** |
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155 | * Get extended pointer on page descriptor from global PPN. |
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156 | ***************************************************************************************** |
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157 | * @ ppn : global physical page number |
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158 | * @ returns extended pointer on page descriptor. |
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159 | ****************************************************************************************/ |
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160 | inline xptr_t ppm_ppn2page( ppn_t ppn ); |
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161 | |
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162 | |
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163 | |
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164 | /***************************************************************************************** |
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165 | * This function prints the PPM allocator status. |
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166 | ***************************************************************************************** |
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167 | * @ ppm : pointer on PPM allocator. |
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168 | * @ string : define context of display. |
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169 | ****************************************************************************************/ |
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170 | void ppm_print( ppm_t * ppm, |
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171 | char * string ); |
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172 | |
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173 | /***************************************************************************************** |
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174 | * This function checks PPM allocator consistency. |
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175 | ***************************************************************************************** |
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176 | * @ ppm : pointer on PPM allocator. |
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177 | * @ return 0 if PPM is OK / return -1 if PPM not consistent. |
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178 | ****************************************************************************************/ |
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179 | error_t ppm_assert_order( ppm_t * ppm ); |
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180 | |
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181 | #endif /* _PPM_H_ */ |
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