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| Rev 110 | Rev 113 | ||
|---|---|---|---|
| Line 62... | Line 62... | ||
| 62 | /* |
62 | /* |
| 63 | * Identity mapping for all but 0th page. |
63 | * Identity mapping for all but 0th page. |
| 64 | * PA2KA(identity) mapping for all but 0th page. |
64 | * PA2KA(identity) mapping for all but 0th page. |
| 65 | */ |
65 | */ |
| 66 | for (i = 1; i < frames; i++) { |
66 | for (i = 1; i < frames; i++) { |
| 67 | map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, dba); |
67 | map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba)); |
| 68 | map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, dba); |
68 | map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba)); |
| 69 | } |
69 | } |
| 70 | 70 | ||
| 71 | trap_register(14, page_fault); |
71 | trap_register(14, page_fault); |
| 72 | cpu_write_dba(KA2PA(dba)); |
72 | cpu_write_dba(KA2PA(dba)); |
| 73 | } |
73 | } |
| Line 110... | Line 110... | ||
| 110 | else dba = cpu_read_dba(); |
110 | else dba = cpu_read_dba(); |
| 111 | 111 | ||
| 112 | pde = page >> 22; /* page directory entry */ |
112 | pde = page >> 22; /* page directory entry */ |
| 113 | pte = (page >> 12) & 0x3ff; /* page table entry */ |
113 | pte = (page >> 12) & 0x3ff; /* page table entry */ |
| 114 | 114 | ||
| 115 | pd = (struct page_specifier *) dba; |
115 | pd = (struct page_specifier *) PA2KA(dba); |
| 116 | 116 | ||
| 117 | if (!pd[pde].present) { |
117 | if (!pd[pde].present) { |
| 118 | /* |
118 | /* |
| 119 | * There is currently no page table for this address. Allocate |
119 | * There is currently no page table for this address. Allocate |
| 120 | * frame for the page table and clean it. |
120 | * frame for the page table and clean it. |
| Line 124... | Line 124... | ||
| 124 | memsetb(newpt, PAGE_SIZE, 0); |
124 | memsetb(newpt, PAGE_SIZE, 0); |
| 125 | pd[pde].present = 1; |
125 | pd[pde].present = 1; |
| 126 | pd[pde].uaccessible = 1; |
126 | pd[pde].uaccessible = 1; |
| 127 | } |
127 | } |
| 128 | 128 | ||
| 129 | pt = (struct page_specifier *) (pd[pde].frame_address << 12); |
129 | pt = (struct page_specifier *) PA2KA((pd[pde].frame_address << 12)); |
| 130 | 130 | ||
| 131 | pt[pte].frame_address = frame >> 12; |
131 | pt[pte].frame_address = frame >> 12; |
| 132 | pt[pte].present = !(flags & PAGE_NOT_PRESENT); |
132 | pt[pte].present = !(flags & PAGE_NOT_PRESENT); |
| 133 | pt[pte].page_cache_disable = !(flags & PAGE_CACHEABLE); |
133 | pt[pte].page_cache_disable = !(flags & PAGE_CACHEABLE); |
| 134 | pt[pte].uaccessible = (flags & PAGE_USER) != 0; |
134 | pt[pte].uaccessible = (flags & PAGE_USER) != 0; |