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| Rev 2131 | Rev 2307 | ||
|---|---|---|---|
| Line 59... | Line 59... | ||
| 59 | 59 | ||
| 60 | /* |
60 | /* |
| 61 | * PA2KA(identity) mapping for all frames until last_frame. |
61 | * PA2KA(identity) mapping for all frames until last_frame. |
| 62 | */ |
62 | */ |
| 63 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
63 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
| 64 | flags = PAGE_CACHEABLE; |
64 | flags = PAGE_CACHEABLE | PAGE_WRITE; |
| 65 | if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size)) |
65 | if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size)) |
| 66 | flags |= PAGE_GLOBAL; |
66 | flags |= PAGE_GLOBAL; |
| 67 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
67 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
| 68 | } |
68 | } |
| 69 | 69 | ||
| 70 | exc_register(14, "page_fault", (iroutine) page_fault); |
70 | exc_register(14, "page_fault", (iroutine) page_fault); |
| 71 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table); |
71 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table); |
| 72 | } |
- | |
| 73 | else { |
72 | } else |
| 74 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table); |
73 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table); |
| 75 | } |
- | |
| 76 | 74 | ||
| 77 | paging_on(); |
75 | paging_on(); |
| 78 | } |
76 | } |
| 79 | 77 | ||
| 80 | 78 | ||
| Line 84... | Line 82... | ||
| 84 | panic("Unable to map physical memory %p (%d bytes)", physaddr, size) |
82 | panic("Unable to map physical memory %p (%d bytes)", physaddr, size) |
| 85 | 83 | ||
| 86 | uintptr_t virtaddr = PA2KA(last_frame); |
84 | uintptr_t virtaddr = PA2KA(last_frame); |
| 87 | pfn_t i; |
85 | pfn_t i; |
| 88 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) |
86 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) |
| 89 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE); |
87 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE | PAGE_WRITE); |
| 90 | 88 | ||
| 91 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
89 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
| 92 | 90 | ||
| 93 | return virtaddr; |
91 | return virtaddr; |
| 94 | } |
92 | } |
| 95 | 93 | ||
| 96 | void page_fault(int n, istate_t *istate) |
94 | void page_fault(int n, istate_t *istate) |
| 97 | { |
95 | { |
| 98 | uintptr_t page; |
96 | uintptr_t page; |
| 99 | pf_access_t access; |
97 | pf_access_t access; |
| 100 | 98 | ||
| 101 | page = read_cr2(); |
99 | page = read_cr2(); |
| 102 | 100 | ||
| 103 | if (istate->error_word & PFERR_CODE_RSVD) |
101 | if (istate->error_word & PFERR_CODE_RSVD) |
| 104 | panic("Reserved bit set in page directory.\n"); |
102 | panic("Reserved bit set in page directory.\n"); |
| 105 | 103 | ||
| 106 | if (istate->error_word & PFERR_CODE_RW) |
104 | if (istate->error_word & PFERR_CODE_RW) |
| 107 | access = PF_ACCESS_WRITE; |
105 | access = PF_ACCESS_WRITE; |
| 108 | else |
106 | else |
| 109 | access = PF_ACCESS_READ; |
107 | access = PF_ACCESS_READ; |
| 110 | 108 | ||
| 111 | if (as_page_fault(page, access, istate) == AS_PF_FAULT) { |
109 | if (as_page_fault(page, access, istate) == AS_PF_FAULT) { |
| 112 | fault_if_from_uspace(istate, "Page fault: %#x", page); |
110 | fault_if_from_uspace(istate, "Page fault: %#x", page); |
| 113 | 111 | ||
| 114 | decode_istate(istate); |
112 | decode_istate(istate); |
| 115 | printf("page fault address: %#x\n", page); |
113 | printf("page fault address: %#x\n", page); |
| 116 | panic("page fault\n"); |
114 | panic("page fault\n"); |
| 117 | } |
115 | } |
| 118 | } |
116 | } |
| 119 | 117 | ||
| 120 | /** @} |
118 | /** @} |
| 121 | */ |
119 | */ |