[25] | 1 | /* |
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[35] | 2 | * hal_gpt.c - implementation of the Generic Page Table API for x86_64 |
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[25] | 3 | * |
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[35] | 4 | * Copyright (c) 2017 Maxime Villard |
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[25] | 5 | * |
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| 6 | * This file is part of ALMOS-MKH. |
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| 7 | * |
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[35] | 8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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[25] | 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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[35] | 12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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[25] | 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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[35] | 23 | #include <hal_boot.h> /* XXX */ |
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[25] | 24 | #include <hal_gpt.h> |
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| 25 | #include <hal_special.h> |
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[35] | 26 | #include <hal_internal.h> |
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| 27 | |
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[25] | 28 | #include <printk.h> |
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| 29 | #include <bits.h> |
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[35] | 30 | #include <string.h> |
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[25] | 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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[35] | 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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[44] | 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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[35] | 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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[45] | 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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[116] | 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 | va_avail = CLUSTER_MIN_VA(0) + KERNEL_VA_SIZE; |
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[45] | 76 | } |
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| 77 | |
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[116] | 78 | /* |
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| 79 | * Uniformize the PA and VA offsets, and return the value. After this function, |
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| 80 | * we are guaranteed to have [VA = PA + constant_offset]. And therefore we can |
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| 81 | * only call hal_gpt_bootstrap_valloc, without entering it in a PA. |
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| 82 | */ |
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| 83 | size_t hal_gpt_bootstrap_uniformize() |
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| 84 | { |
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| 85 | size_t pa_offset = pa_avail - 0; |
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| 86 | size_t va_offset = va_avail - CLUSTER_MIN_VA(0); |
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| 87 | |
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| 88 | if (pa_offset < va_offset) |
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| 89 | pa_avail += (va_offset - pa_offset); |
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| 90 | else if (pa_offset > va_offset) |
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| 91 | va_avail += (pa_offset - va_offset); |
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| 92 | |
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| 93 | return MAX(pa_offset, va_offset); |
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| 94 | } |
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| 95 | |
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[83] | 96 | void hal_gpt_enter(vaddr_t va, paddr_t pa, pt_entry_t flags) |
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[35] | 97 | { |
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[45] | 98 | XASSERT(va % PAGE_SIZE == 0); |
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| 99 | XASSERT(pa % PAGE_SIZE == 0); |
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[116] | 100 | //XASSERT(va == tmpva || PTE_BASE[pl1_i(va)] == 0); |
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[83] | 101 | PTE_BASE[pl1_i(va)] = (pa & PG_FRAME) | flags; |
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[79] | 102 | invlpg(va); |
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[35] | 103 | } |
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| 104 | |
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[39] | 105 | void hal_gpt_enter_range(vaddr_t va, paddr_t pa, size_t n) |
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| 106 | { |
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[83] | 107 | pt_entry_t flags = PG_V | PG_KW | PG_NX; |
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[39] | 108 | size_t i; |
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| 109 | for (i = 0; i < n; i++) { |
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[83] | 110 | hal_gpt_enter(va + i * PAGE_SIZE, pa + i * PAGE_SIZE, flags); |
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[39] | 111 | } |
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| 112 | } |
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| 113 | |
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[45] | 114 | void hal_gpt_leave(vaddr_t va) |
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| 115 | { |
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| 116 | XASSERT(va % PAGE_SIZE == 0); |
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| 117 | XASSERT(PTE_BASE[pl1_i(va)] != 0); |
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| 118 | PTE_BASE[pl1_i(va)] = 0; |
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[79] | 119 | invlpg(va); |
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[45] | 120 | } |
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| 121 | |
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| 122 | void hal_gpt_leave_range(vaddr_t va, size_t n) |
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| 123 | { |
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| 124 | size_t i; |
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| 125 | for (i = 0; i < n; i++) { |
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| 126 | hal_gpt_leave(va + i * PAGE_SIZE); |
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| 127 | } |
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| 128 | } |
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| 129 | |
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[35] | 130 | /* |
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| 131 | * Create a page tree that can map va_start->va_end. The caller can then |
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| 132 | * enter these addresses to physical locations. |
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| 133 | * |
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| 134 | * This functions is a bit complicated, and may need to be revisited. |
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| 135 | */ |
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| 136 | void hal_gpt_maptree_area(vaddr_t va_start, vaddr_t va_end) |
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| 137 | { |
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[112] | 138 | pt_entry_t flags = PG_V | PG_KW | PG_NX; |
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[35] | 139 | size_t L4start, L4end, nL4e; |
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| 140 | size_t L3start, L3end, nL3e; |
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| 141 | size_t L2start, L2end, nL2e; |
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| 142 | paddr_t L3page, L2page, L1page; |
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| 143 | paddr_t pa; |
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| 144 | size_t i, npa; |
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| 145 | pt_entry_t *pde; |
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| 146 | |
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| 147 | /* Allocate L3 */ |
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| 148 | L4start = pl4_i(va_start); |
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| 149 | L4end = pl4_i(va_end); |
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| 150 | nL4e = (L4end - L4start + 1); |
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| 151 | L3page = hal_gpt_bootstrap_palloc(nL4e); |
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| 152 | |
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| 153 | /* Allocate L2 */ |
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| 154 | L3start = pl3_i(va_start); |
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| 155 | L3end = pl3_i(va_end); |
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| 156 | nL3e = (L3end - L3start + 1); |
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| 157 | L2page = hal_gpt_bootstrap_palloc(nL3e); |
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| 158 | |
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| 159 | /* Allocate L1 */ |
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| 160 | L2start = pl2_i(va_start); |
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| 161 | L2end = pl2_i(va_end); |
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| 162 | nL2e = (L2end - L2start + 1); |
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| 163 | L1page = hal_gpt_bootstrap_palloc(nL2e); |
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| 164 | |
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| 165 | /* Zero out L1 */ |
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| 166 | for (i = 0; i < nL2e; i++) { |
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| 167 | pa = L1page + i * PAGE_SIZE; |
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[83] | 168 | hal_gpt_enter(tmpva, pa, flags); |
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[35] | 169 | |
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| 170 | memset((void *)tmpva, 0, PAGE_SIZE); |
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| 171 | } |
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| 172 | |
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| 173 | /* Zero out L2 */ |
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| 174 | for (i = 0; i < nL3e; i++) { |
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| 175 | pa = L2page + i * PAGE_SIZE; |
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[83] | 176 | hal_gpt_enter(tmpva, pa, flags); |
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[35] | 177 | |
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| 178 | memset((void *)tmpva, 0, PAGE_SIZE); |
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| 179 | } |
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| 180 | |
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| 181 | /* Zero out L3 */ |
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| 182 | for (i = 0; i < nL4e; i++) { |
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| 183 | pa = L3page + i * PAGE_SIZE; |
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[83] | 184 | hal_gpt_enter(tmpva, pa, flags); |
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[35] | 185 | |
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| 186 | memset((void *)tmpva, 0, PAGE_SIZE); |
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| 187 | } |
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| 188 | |
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| 189 | /* Create L2, linked to L1 */ |
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| 190 | npa = (L2start / NPDPG) * PAGE_SIZE; |
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| 191 | for (i = L2start; i <= L2end; i++) { |
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| 192 | pa = (paddr_t)&(((pt_entry_t *)L2page)[i]); |
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| 193 | pa -= npa; /* shift on the left */ |
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| 194 | pa &= PG_FRAME; /* rounddown to a page boundary */ |
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[83] | 195 | hal_gpt_enter(tmpva, pa, flags); |
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[35] | 196 | |
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| 197 | pde = (pt_entry_t *)tmpva; |
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| 198 | pa = L1page + (i - L2start) * PAGE_SIZE; |
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| 199 | pde[i % NPDPG] = (pa & PG_FRAME) | PG_V | PG_KW; |
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| 200 | } |
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| 201 | |
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| 202 | /* Create L3, linked to L2 */ |
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| 203 | npa = (L3start / NPDPG) * PAGE_SIZE; |
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| 204 | for (i = L3start; i <= L3end; i++) { |
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| 205 | pa = (paddr_t)&(((pt_entry_t *)L3page)[i]); |
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| 206 | pa -= npa; /* shift on the left */ |
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| 207 | pa &= PG_FRAME; /* rounddown to a page boundary */ |
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[83] | 208 | hal_gpt_enter(tmpva, pa, flags); |
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[35] | 209 | |
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| 210 | pde = (pt_entry_t *)tmpva; |
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| 211 | pa = L2page + (i - L3start) * PAGE_SIZE; |
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| 212 | pde[i % NPDPG] = (pa & PG_FRAME) | PG_V | PG_KW; |
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| 213 | } |
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| 214 | |
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| 215 | /* Link L3 into L4 */ |
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| 216 | for (i = 0; i < nL4e; i++) { |
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| 217 | pa = L3page + i * PAGE_SIZE; |
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| 218 | L4_BASE[L4start + i] = (pa & PG_FRAME) | PG_V | PG_KW; |
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| 219 | } |
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| 220 | } |
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| 221 | |
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| 222 | void hal_gpt_init(paddr_t firstpa) |
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| 223 | { |
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[112] | 224 | paddr_t kimg_min_pa, kimg_max_pa; |
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[44] | 225 | |
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| 226 | /* Initialize global values */ |
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[35] | 227 | pa_avail = firstpa; |
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[47] | 228 | va_avail = CLUSTER_MIN_VA(0) + KERNEL_VA_SIZE; |
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[44] | 229 | kimg_size = ((uint64_t)&__kernel_end - KERNBASE); |
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| 230 | XASSERT(kimg_size % PAGE_SIZE == 0); |
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| 231 | |
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[112] | 232 | kimg_min_pa = 0; |
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| 233 | kimg_max_pa = kimg_min_pa + kimg_size; |
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| 234 | |
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[134] | 235 | /* Create cluster0's page tree */ |
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[47] | 236 | hal_gpt_maptree_area(CLUSTER_MIN_VA(0), CLUSTER_MAX_VA(0)); |
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[44] | 237 | |
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| 238 | /* Manually enter cluster0's kimg */ |
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[112] | 239 | hal_gpt_enter_range(CLUSTER_MIN_VA(0), kimg_min_pa, kimg_size / PAGE_SIZE); |
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| 240 | |
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| 241 | /* Manually enter cluster0's heap */ |
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| 242 | hal_gpt_enter_range(CLUSTER_MIN_VA(0) + kimg_size, kimg_max_pa, |
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| 243 | (CLUSTER_VA_SIZE - kimg_size) / PAGE_SIZE); |
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[123] | 244 | |
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| 245 | /* Unmap the area below the kernel */ |
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| 246 | hal_gpt_leave_range(CLUSTER_MIN_VA(0), (KERNTEXTOFF - KERNBASE) / PAGE_SIZE); |
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[35] | 247 | } |
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| 248 | |
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| 249 | /* -------------------------------------------------------------------------- */ |
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| 250 | |
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[25] | 251 | /**************************************************************************************** |
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| 252 | * These global variables defines the masks for the Generic Page Table Entry attributes, |
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| 253 | * and must be defined in all GPT implementation. |
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| 254 | ***************************************************************************************/ |
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| 255 | |
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| 256 | uint32_t GPT_MAPPED; |
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| 257 | uint32_t GPT_SMALL; |
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| 258 | uint32_t GPT_READABLE; |
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| 259 | uint32_t GPT_WRITABLE; |
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| 260 | uint32_t GPT_EXECUTABLE; |
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| 261 | uint32_t GPT_CACHABLE; |
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| 262 | uint32_t GPT_USER; |
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| 263 | uint32_t GPT_DIRTY; |
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| 264 | uint32_t GPT_ACCESSED; |
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| 265 | uint32_t GPT_GLOBAL; |
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| 266 | uint32_t GPT_COW; |
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| 267 | uint32_t GPT_SWAP; |
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| 268 | uint32_t GPT_LOCKED; |
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| 269 | |
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| 270 | error_t hal_gpt_create( gpt_t * gpt ) |
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| 271 | { |
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[48] | 272 | x86_panic((char *)__func__); |
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[25] | 273 | return 0; |
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| 274 | } |
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| 275 | |
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| 276 | void hal_gpt_destroy( gpt_t * gpt ) |
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| 277 | { |
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[48] | 278 | x86_panic((char *)__func__); |
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[25] | 279 | } |
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| 280 | |
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| 281 | void hal_gpt_print( gpt_t * gpt ) |
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| 282 | { |
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[48] | 283 | x86_panic((char *)__func__); |
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[25] | 284 | } |
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| 285 | |
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| 286 | error_t hal_gpt_set_pte( gpt_t * gpt, |
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| 287 | vpn_t vpn, |
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| 288 | ppn_t ppn, |
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| 289 | uint32_t attr ) |
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| 290 | { |
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[48] | 291 | x86_panic((char *)__func__); |
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[25] | 292 | return 0; |
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| 293 | } |
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| 294 | |
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| 295 | void hal_gpt_get_pte( gpt_t * gpt, |
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| 296 | vpn_t vpn, |
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| 297 | uint32_t * attr, |
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| 298 | ppn_t * ppn ) |
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| 299 | { |
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[48] | 300 | x86_panic((char *)__func__); |
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[25] | 301 | } |
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| 302 | |
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| 303 | void hal_gpt_reset_pte( gpt_t * gpt, |
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| 304 | vpn_t vpn ) |
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| 305 | { |
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[48] | 306 | x86_panic((char *)__func__); |
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[25] | 307 | } |
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| 308 | |
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| 309 | error_t hal_gpt_lock_pte( gpt_t * gpt, |
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| 310 | vpn_t vpn ) |
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| 311 | { |
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[48] | 312 | x86_panic((char *)__func__); |
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[25] | 313 | return 0; |
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| 314 | } |
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| 315 | |
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| 316 | error_t hal_gpt_unlock_pte( gpt_t * gpt, |
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| 317 | vpn_t vpn ) |
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| 318 | { |
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[48] | 319 | x86_panic((char *)__func__); |
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[25] | 320 | return 0; |
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| 321 | } |
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| 322 | |
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| 323 | error_t hal_gpt_copy( gpt_t * dst_gpt, |
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| 324 | gpt_t * src_gpt, |
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| 325 | bool_t cow ) |
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| 326 | { |
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[48] | 327 | x86_panic((char *)__func__); |
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[25] | 328 | return 0; |
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| 329 | } |
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| 330 | |
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