1 | /* |
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2 | * hal_gpt.c - implementation of the Generic Page Table API for x86_64 |
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3 | * |
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4 | * Copyright (c) 2017 Maxime Villard |
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5 | * |
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6 | * This file is part of ALMOS-MKH. |
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7 | * |
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8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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9 | * under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; version 2.0 of the License. |
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11 | * |
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12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |
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22 | #include <hal_types.h> |
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23 | #include <hal_boot.h> /* XXX */ |
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24 | #include <hal_gpt.h> |
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25 | #include <hal_special.h> |
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26 | #include <hal_internal.h> |
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27 | |
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28 | #include <printk.h> |
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29 | #include <bits.h> |
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30 | #include <string.h> |
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31 | #include <process.h> |
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32 | #include <kmem.h> |
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33 | #include <thread.h> |
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34 | #include <cluster.h> |
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35 | #include <ppm.h> |
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36 | #include <page.h> |
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37 | |
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38 | #define VA_SIGN_MASK 0xffff000000000000 |
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39 | #define VA_SIGN_POS(va) ((va) & ~VA_SIGN_MASK) |
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40 | |
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41 | #define pl1_i(VA) (((VA_SIGN_POS(VA)) & L1_FRAME) >> L1_SHIFT) |
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42 | #define pl2_i(VA) (((VA_SIGN_POS(VA)) & L2_FRAME) >> L2_SHIFT) |
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43 | #define pl3_i(VA) (((VA_SIGN_POS(VA)) & L3_FRAME) >> L3_SHIFT) |
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44 | #define pl4_i(VA) (((VA_SIGN_POS(VA)) & L4_FRAME) >> L4_SHIFT) |
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45 | |
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46 | extern vaddr_t __kernel_end; |
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47 | size_t kimg_size __in_kdata = 0; |
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48 | |
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49 | paddr_t pa_avail __in_kdata = 0; |
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50 | vaddr_t va_avail __in_kdata = 0; |
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51 | vaddr_t tmpva __in_kdata = (KERNBASE + NKL2_KIMG_ENTRIES * NBPD_L2); |
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52 | |
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53 | paddr_t hal_gpt_bootstrap_palloc(size_t npages) |
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54 | { |
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55 | paddr_t pa = pa_avail; |
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56 | pa_avail += npages * PAGE_SIZE; |
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57 | return pa; |
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58 | } |
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59 | |
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60 | vaddr_t hal_gpt_bootstrap_valloc(size_t npages) |
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61 | { |
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62 | vaddr_t va = va_avail; |
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63 | va_avail += npages * PAGE_SIZE; |
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64 | return va; |
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65 | } |
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66 | |
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67 | /* |
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68 | * Reset the bootstrap VA we've used in cluster0 so far. After this |
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69 | * function, cluster0's heap is empty. |
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70 | */ |
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71 | void hal_gpt_bootstrap_reset() |
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72 | { |
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73 | size_t npages = (va_avail - (CLUSTER_MIN_VA(0) + KERNEL_VA_SIZE)) / PAGE_SIZE; |
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74 | hal_gpt_leave_range(CLUSTER_MIN_VA(0) + KERNEL_VA_SIZE, npages); |
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75 | } |
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76 | |
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77 | void hal_gpt_enter(vaddr_t va, paddr_t pa) |
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78 | { |
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79 | XASSERT(va % PAGE_SIZE == 0); |
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80 | XASSERT(pa % PAGE_SIZE == 0); |
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81 | XASSERT(va == tmpva || PTE_BASE[pl1_i(va)] == 0); |
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82 | PTE_BASE[pl1_i(va)] = (pa & PG_FRAME) | PG_V | PG_KW | PG_NX; |
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83 | } |
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84 | |
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85 | void hal_gpt_enter_range(vaddr_t va, paddr_t pa, size_t n) |
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86 | { |
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87 | size_t i; |
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88 | for (i = 0; i < n; i++) { |
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89 | hal_gpt_enter(va + i * PAGE_SIZE, pa + i * PAGE_SIZE); |
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90 | invlpg(va + i * PAGE_SIZE); |
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91 | } |
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92 | } |
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93 | |
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94 | void hal_gpt_leave(vaddr_t va) |
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95 | { |
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96 | XASSERT(va % PAGE_SIZE == 0); |
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97 | XASSERT(PTE_BASE[pl1_i(va)] != 0); |
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98 | PTE_BASE[pl1_i(va)] = 0; |
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99 | } |
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100 | |
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101 | void hal_gpt_leave_range(vaddr_t va, size_t n) |
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102 | { |
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103 | size_t i; |
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104 | for (i = 0; i < n; i++) { |
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105 | hal_gpt_leave(va + i * PAGE_SIZE); |
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106 | invlpg(va + i * PAGE_SIZE); |
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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 | * Create a page tree that can map va_start->va_end. The caller can then |
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112 | * enter these addresses to physical locations. |
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113 | * |
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114 | * This functions is a bit complicated, and may need to be revisited. |
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115 | */ |
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116 | void hal_gpt_maptree_area(vaddr_t va_start, vaddr_t va_end) |
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117 | { |
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118 | size_t L4start, L4end, nL4e; |
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119 | size_t L3start, L3end, nL3e; |
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120 | size_t L2start, L2end, nL2e; |
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121 | paddr_t L3page, L2page, L1page; |
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122 | paddr_t pa; |
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123 | size_t i, npa; |
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124 | pt_entry_t *pde; |
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125 | |
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126 | /* Allocate L3 */ |
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127 | L4start = pl4_i(va_start); |
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128 | L4end = pl4_i(va_end); |
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129 | nL4e = (L4end - L4start + 1); |
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130 | L3page = hal_gpt_bootstrap_palloc(nL4e); |
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131 | |
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132 | /* Allocate L2 */ |
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133 | L3start = pl3_i(va_start); |
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134 | L3end = pl3_i(va_end); |
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135 | nL3e = (L3end - L3start + 1); |
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136 | L2page = hal_gpt_bootstrap_palloc(nL3e); |
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137 | |
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138 | /* Allocate L1 */ |
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139 | L2start = pl2_i(va_start); |
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140 | L2end = pl2_i(va_end); |
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141 | nL2e = (L2end - L2start + 1); |
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142 | L1page = hal_gpt_bootstrap_palloc(nL2e); |
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143 | |
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144 | /* Zero out L1 */ |
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145 | for (i = 0; i < nL2e; i++) { |
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146 | pa = L1page + i * PAGE_SIZE; |
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147 | hal_gpt_enter(tmpva, pa); |
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148 | invlpg(tmpva); |
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149 | |
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150 | memset((void *)tmpva, 0, PAGE_SIZE); |
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151 | } |
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152 | |
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153 | /* Zero out L2 */ |
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154 | for (i = 0; i < nL3e; i++) { |
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155 | pa = L2page + i * PAGE_SIZE; |
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156 | hal_gpt_enter(tmpva, pa); |
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157 | invlpg(tmpva); |
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158 | |
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159 | memset((void *)tmpva, 0, PAGE_SIZE); |
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160 | } |
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161 | |
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162 | /* Zero out L3 */ |
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163 | for (i = 0; i < nL4e; i++) { |
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164 | pa = L3page + i * PAGE_SIZE; |
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165 | hal_gpt_enter(tmpva, pa); |
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166 | invlpg(tmpva); |
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167 | |
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168 | memset((void *)tmpva, 0, PAGE_SIZE); |
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169 | } |
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170 | |
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171 | /* Create L2, linked to L1 */ |
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172 | npa = (L2start / NPDPG) * PAGE_SIZE; |
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173 | for (i = L2start; i <= L2end; i++) { |
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174 | pa = (paddr_t)&(((pt_entry_t *)L2page)[i]); |
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175 | pa -= npa; /* shift on the left */ |
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176 | pa &= PG_FRAME; /* rounddown to a page boundary */ |
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177 | hal_gpt_enter(tmpva, pa); |
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178 | invlpg(tmpva); |
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179 | |
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180 | pde = (pt_entry_t *)tmpva; |
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181 | pa = L1page + (i - L2start) * PAGE_SIZE; |
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182 | pde[i % NPDPG] = (pa & PG_FRAME) | PG_V | PG_KW; |
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183 | } |
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184 | |
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185 | /* Create L3, linked to L2 */ |
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186 | npa = (L3start / NPDPG) * PAGE_SIZE; |
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187 | for (i = L3start; i <= L3end; i++) { |
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188 | pa = (paddr_t)&(((pt_entry_t *)L3page)[i]); |
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189 | pa -= npa; /* shift on the left */ |
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190 | pa &= PG_FRAME; /* rounddown to a page boundary */ |
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191 | hal_gpt_enter(tmpva, pa); |
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192 | invlpg(tmpva); |
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193 | |
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194 | pde = (pt_entry_t *)tmpva; |
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195 | pa = L2page + (i - L3start) * PAGE_SIZE; |
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196 | pde[i % NPDPG] = (pa & PG_FRAME) | PG_V | PG_KW; |
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197 | } |
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198 | |
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199 | /* Link L3 into L4 */ |
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200 | for (i = 0; i < nL4e; i++) { |
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201 | pa = L3page + i * PAGE_SIZE; |
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202 | L4_BASE[L4start + i] = (pa & PG_FRAME) | PG_V | PG_KW; |
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203 | } |
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204 | } |
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205 | |
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206 | void hal_gpt_init(paddr_t firstpa) |
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207 | { |
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208 | paddr_t kimg_min_pa = 0; |
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209 | |
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210 | /* Initialize global values */ |
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211 | pa_avail = firstpa; |
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212 | va_avail = CLUSTER_MIN_VA(0) + KERNEL_VA_SIZE; |
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213 | kimg_size = ((uint64_t)&__kernel_end - KERNBASE); |
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214 | XASSERT(kimg_size % PAGE_SIZE == 0); |
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215 | kimg_size = kimg_size / PAGE_SIZE; |
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216 | |
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217 | /* Create cluster0's heap entry. */ |
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218 | hal_gpt_maptree_area(CLUSTER_MIN_VA(0), CLUSTER_MAX_VA(0)); |
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219 | |
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220 | /* Manually enter cluster0's kimg */ |
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221 | hal_gpt_enter_range(CLUSTER_MIN_VA(0), kimg_min_pa, kimg_size); |
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222 | } |
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223 | |
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224 | /* -------------------------------------------------------------------------- */ |
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225 | |
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226 | /**************************************************************************************** |
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227 | * These global variables defines the masks for the Generic Page Table Entry attributes, |
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228 | * and must be defined in all GPT implementation. |
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229 | ***************************************************************************************/ |
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230 | |
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231 | uint32_t GPT_MAPPED; |
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232 | uint32_t GPT_SMALL; |
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233 | uint32_t GPT_READABLE; |
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234 | uint32_t GPT_WRITABLE; |
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235 | uint32_t GPT_EXECUTABLE; |
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236 | uint32_t GPT_CACHABLE; |
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237 | uint32_t GPT_USER; |
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238 | uint32_t GPT_DIRTY; |
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239 | uint32_t GPT_ACCESSED; |
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240 | uint32_t GPT_GLOBAL; |
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241 | uint32_t GPT_COW; |
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242 | uint32_t GPT_SWAP; |
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243 | uint32_t GPT_LOCKED; |
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244 | |
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245 | error_t hal_gpt_create( gpt_t * gpt ) |
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246 | { |
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247 | x86_panic((char *)__func__); |
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248 | return 0; |
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249 | } |
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250 | |
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251 | void hal_gpt_destroy( gpt_t * gpt ) |
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252 | { |
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253 | x86_panic((char *)__func__); |
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254 | } |
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255 | |
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256 | void hal_gpt_print( gpt_t * gpt ) |
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257 | { |
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258 | x86_panic((char *)__func__); |
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259 | } |
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260 | |
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261 | error_t hal_gpt_set_pte( gpt_t * gpt, |
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262 | vpn_t vpn, |
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263 | ppn_t ppn, |
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264 | uint32_t attr ) |
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265 | { |
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266 | x86_panic((char *)__func__); |
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267 | return 0; |
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268 | } |
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269 | |
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270 | void hal_gpt_get_pte( gpt_t * gpt, |
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271 | vpn_t vpn, |
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272 | uint32_t * attr, |
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273 | ppn_t * ppn ) |
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274 | { |
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275 | x86_panic((char *)__func__); |
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276 | } |
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277 | |
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278 | void hal_gpt_reset_pte( gpt_t * gpt, |
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279 | vpn_t vpn ) |
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280 | { |
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281 | x86_panic((char *)__func__); |
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282 | } |
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283 | |
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284 | error_t hal_gpt_lock_pte( gpt_t * gpt, |
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285 | vpn_t vpn ) |
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286 | { |
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287 | x86_panic((char *)__func__); |
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288 | return 0; |
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289 | } |
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290 | |
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291 | error_t hal_gpt_unlock_pte( gpt_t * gpt, |
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292 | vpn_t vpn ) |
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293 | { |
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294 | x86_panic((char *)__func__); |
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295 | return 0; |
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296 | } |
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297 | |
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298 | error_t hal_gpt_copy( gpt_t * dst_gpt, |
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299 | gpt_t * src_gpt, |
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300 | bool_t cow ) |
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301 | { |
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302 | x86_panic((char *)__func__); |
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303 | return 0; |
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304 | } |
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305 | |
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