| 1 | /*
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| 2 | * Copyright (c) 2001-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup amd64mm
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <arch/mm/page.h>
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| 36 | #include <genarch/mm/page_pt.h>
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| 37 | #include <arch/mm/frame.h>
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| 38 | #include <mm/page.h>
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| 39 | #include <mm/frame.h>
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| 40 | #include <mm/as.h>
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| 41 | #include <arch/interrupt.h>
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| 42 | #include <arch/asm.h>
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| 43 | #include <config.h>
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| 44 | #include <memstr.h>
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| 45 | #include <interrupt.h>
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| 46 | #include <print.h>
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| 47 | #include <panic.h>
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| 48 | #include <align.h>
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| 49 |
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| 50 | /* Definitions for identity page mapper */
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| 51 | pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
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| 52 | pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
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| 53 | pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
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| 54 | extern pte_t ptl_0; /* From boot.S */
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| 55 |
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| 56 | #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
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| 57 | #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
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| 58 | #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
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| 59 |
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| 60 | #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
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| 61 | #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
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| 62 | #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
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| 63 |
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| 64 | #define SETUP_PTL1(ptl0, page, tgt) { \
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| 65 | SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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| 66 | SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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| 67 | }
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| 68 | #define SETUP_PTL2(ptl1, page, tgt) { \
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| 69 | SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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| 70 | SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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| 71 | }
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| 72 | #define SETUP_PTL3(ptl2, page, tgt) { \
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| 73 | SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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| 74 | SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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| 75 | }
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| 76 | #define SETUP_FRAME(ptl3, page, tgt) { \
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| 77 | SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (uintptr_t)KA2PA(tgt)); \
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| 78 | SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
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| 79 | }
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| 80 |
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| 81 |
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| 82 | void page_arch_init(void)
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| 83 | {
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| 84 | uintptr_t cur;
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| 85 | unsigned int i;
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| 86 | int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL | PAGE_WRITE;
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| 87 |
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| 88 | if (config.cpu_active == 1) {
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| 89 | page_mapping_operations = &pt_mapping_operations;
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| 90 |
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| 91 | page_table_lock(AS_KERNEL, true);
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| 92 |
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| 93 | /*
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| 94 | * PA2KA(identity) mapping for all frames.
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| 95 | */
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| 96 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
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| 97 | /* Standard identity mapping */
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| 98 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
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| 99 | }
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| 100 |
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| 101 | /* Upper kernel mapping
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| 102 | * - from zero to top of kernel (include bottom addresses
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| 103 | * because some are needed for init)
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| 104 | */
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| 105 | for (cur = PA2KA_CODE(0); cur < config.base + config.kernel_size; cur += FRAME_SIZE)
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| 106 | page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
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| 107 |
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| 108 | for (cur = config.stack_base; cur < config.stack_base + config.stack_size; cur += FRAME_SIZE)
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| 109 | page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
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| 110 |
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| 111 | for (i = 0; i < init.cnt; i++) {
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| 112 | for (cur = init.tasks[i].addr; cur < init.tasks[i].addr + init.tasks[i].size; cur += FRAME_SIZE)
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| 113 | page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
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| 114 | }
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| 115 |
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| 116 | page_table_unlock(AS_KERNEL, true);
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| 117 |
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| 118 | exc_register(14, "page_fault", true, (iroutine_t) page_fault);
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| 119 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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| 120 | } else
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| 121 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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| 122 | }
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| 123 |
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| 124 |
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| 125 | /** Identity page mapper
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| 126 | *
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| 127 | * We need to map whole physical memory identically before the page subsystem
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| 128 | * is initializaed. This thing clears page table and fills in the specific
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| 129 | * items.
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| 130 | */
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| 131 | void ident_page_fault(unsigned int n, istate_t *istate)
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| 132 | {
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| 133 | uintptr_t page;
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| 134 | static uintptr_t oldpage = 0;
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| 135 | pte_t *aptl_1, *aptl_2, *aptl_3;
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| 136 |
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| 137 | page = read_cr2();
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| 138 | if (oldpage) {
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| 139 | /* Unmap old address */
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| 140 | aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
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| 141 | aptl_2 = PTL2_ADDR(aptl_1, oldpage);
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| 142 | aptl_3 = PTL3_ADDR(aptl_2, oldpage);
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| 143 |
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| 144 | SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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| 145 | if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
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| 146 | SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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| 147 | if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
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| 148 | SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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| 149 | if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
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| 150 | SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
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| 151 | }
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| 152 | if (PTL1_PRESENT(&ptl_0, page))
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| 153 | aptl_1 = PTL1_ADDR(&ptl_0, page);
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| 154 | else {
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| 155 | SETUP_PTL1(&ptl_0, page, helper_ptl1);
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| 156 | aptl_1 = helper_ptl1;
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| 157 | }
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| 158 |
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| 159 | if (PTL2_PRESENT(aptl_1, page))
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| 160 | aptl_2 = PTL2_ADDR(aptl_1, page);
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| 161 | else {
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| 162 | SETUP_PTL2(aptl_1, page, helper_ptl2);
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| 163 | aptl_2 = helper_ptl2;
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| 164 | }
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| 165 |
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| 166 | if (PTL3_PRESENT(aptl_2, page))
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| 167 | aptl_3 = PTL3_ADDR(aptl_2, page);
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| 168 | else {
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| 169 | SETUP_PTL3(aptl_2, page, helper_ptl3);
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| 170 | aptl_3 = helper_ptl3;
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| 171 | }
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| 172 |
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| 173 | SETUP_FRAME(aptl_3, page, page);
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| 174 |
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| 175 | oldpage = page;
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| 176 | }
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| 177 |
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| 178 |
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| 179 | void page_fault(unsigned int n, istate_t *istate)
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| 180 | {
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| 181 | uintptr_t page;
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| 182 | pf_access_t access;
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| 183 |
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| 184 | page = read_cr2();
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| 185 |
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| 186 | if (istate->error_word & PFERR_CODE_RSVD)
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| 187 | panic("Reserved bit set in page table entry.");
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| 188 |
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| 189 | if (istate->error_word & PFERR_CODE_RW)
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| 190 | access = PF_ACCESS_WRITE;
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| 191 | else if (istate->error_word & PFERR_CODE_ID)
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| 192 | access = PF_ACCESS_EXEC;
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| 193 | else
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| 194 | access = PF_ACCESS_READ;
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| 195 |
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| 196 | if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
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| 197 | fault_if_from_uspace(istate, "Page fault: %#x.", page);
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| 198 |
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| 199 | decode_istate(n, istate);
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| 200 | printf("Page fault address: %llx.\n", page);
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| 201 | panic("Page fault.");
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| 202 | }
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| 203 | }
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| 204 |
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| 205 |
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| 206 | uintptr_t hw_map(uintptr_t physaddr, size_t size)
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| 207 | {
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| 208 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
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| 209 | panic("Unable to map physical memory %p (%d bytes).", physaddr,
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| 210 | size);
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| 211 |
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| 212 | uintptr_t virtaddr = PA2KA(last_frame);
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| 213 | pfn_t i;
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| 214 |
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| 215 | page_table_lock(AS_KERNEL, true);
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| 216 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
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| 217 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE | PAGE_WRITE);
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| 218 | page_table_unlock(AS_KERNEL, true);
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| 219 |
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| 220 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
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| 221 |
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| 222 | return virtaddr;
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| 223 | }
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| 224 |
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| 225 | /** @}
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| 226 | */
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