| 29,11 → 29,236 |
|---|
| #include <arch/mm/page.h> |
| #include <genarch/mm/page_pt.h> |
| #include <arch/mm/frame.h> |
| #include <arch/asm.h> |
| #include <mm/frame.h> |
| #include <mm/page.h> |
| #include <mm/as.h> |
| #include <arch.h> |
| #include <arch/types.h> |
| #include <arch/exception.h> |
| #include <config.h> |
| #include <print.h> |
| #include <symtab.h> |
| |
| static phte_t *phte; |
| |
| |
| /** Try to find PTE for faulting address |
| * |
| * Try to find PTE for faulting address. |
| * The AS->lock must be held on entry to this function. |
| * |
| * @param badvaddr Faulting virtual address. |
| * @param istate Pointer to interrupted state. |
| * @param pfrc Pointer to variable where as_page_fault() return code will be stored. |
| * @return PTE on success, NULL otherwise. |
| * |
| */ |
| static pte_t *find_mapping_and_check(__address badvaddr, istate_t *istate, int *pfcr) |
| { |
| /* |
| * Check if the mapping exists in page tables. |
| */ |
| pte_t *pte = page_mapping_find(AS, badvaddr); |
| if ((pte) && (pte->p)) { |
| /* |
| * Mapping found in page tables. |
| * Immediately succeed. |
| */ |
| return pte; |
| } else { |
| int rc; |
| |
| /* |
| * Mapping not found in page tables. |
| * Resort to higher-level page fault handler. |
| */ |
| page_table_unlock(AS, true); |
| switch (rc = as_page_fault(badvaddr, istate)) { |
| case AS_PF_OK: |
| /* |
| * The higher-level page fault handler succeeded, |
| * The mapping ought to be in place. |
| */ |
| page_table_lock(AS, true); |
| pte = page_mapping_find(AS, badvaddr); |
| ASSERT((pte) && (pte->p)); |
| return pte; |
| case AS_PF_DEFER: |
| page_table_lock(AS, true); |
| *pfcr = rc; |
| return NULL; |
| case AS_PF_FAULT: |
| page_table_lock(AS, true); |
| printf("Page fault.\n"); |
| *pfcr = rc; |
| return NULL; |
| default: |
| panic("unexpected rc (%d)\n", rc); |
| } |
| } |
| } |
| |
| |
| static void pht_refill_fail(__address badvaddr, istate_t *istate) |
| { |
| char *symbol = ""; |
| char *sym2 = ""; |
| |
| char *s = get_symtab_entry(istate->pc); |
| if (s) |
| symbol = s; |
| s = get_symtab_entry(istate->lr); |
| if (s) |
| sym2 = s; |
| panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2); |
| } |
| |
| static void pht_insert(const __address vaddr, const pfn_t pfn) |
| { |
| __u32 page = (vaddr >> 12) & 0xffff; |
| __u32 api = (vaddr >> 22) & 0x3f; |
| __u32 vsid; |
| |
| asm volatile ( |
| "mfsrin %0, %1\n" |
| : "=r" (vsid) |
| : "r" (vaddr) |
| ); |
| |
| /* Primary hash (xor) */ |
| __u32 hash = ((vsid ^ page) & 0x3ff) << 3; |
| |
| __u32 i; |
| /* Find unused PTE in PTEG */ |
| for (i = 0; i < 8; i++) { |
| if (!phte[hash + i].v) |
| break; |
| } |
| |
| // TODO: Check access/change bits, secondary hash |
| |
| if (i == 8) |
| i = page % 8; |
| |
| phte[hash + i].v = 1; |
| phte[hash + i].vsid = vsid; |
| phte[hash + i].h = 0; |
| phte[hash + i].api = api; |
| phte[hash + i].rpn = pfn; |
| phte[hash + i].r = 0; |
| phte[hash + i].c = 0; |
| phte[hash + i].pp = 2; // FIXME |
| } |
| |
| |
| /** Process Instruction/Data Storage Interrupt |
| * |
| * @param data True if Data Storage Interrupt. |
| * @param istate Interrupted register context. |
| * |
| */ |
| void pht_refill(bool data, istate_t *istate) |
| { |
| asid_t asid; |
| __address badvaddr; |
| pte_t *pte; |
| |
| int pfcr; |
| |
| if (data) { |
| asm volatile ( |
| "mfdar %0\n" |
| : "=r" (badvaddr) |
| ); |
| } else |
| badvaddr = istate->pc; |
| |
| spinlock_lock(&AS->lock); |
| asid = AS->asid; |
| spinlock_unlock(&AS->lock); |
| |
| page_table_lock(AS, true); |
| |
| pte = find_mapping_and_check(badvaddr, istate, &pfcr); |
| if (!pte) { |
| switch (pfcr) { |
| case AS_PF_FAULT: |
| goto fail; |
| break; |
| case AS_PF_DEFER: |
| /* |
| * The page fault came during copy_from_uspace() |
| * or copy_to_uspace(). |
| */ |
| page_table_unlock(AS, true); |
| return; |
| default: |
| panic("Unexpected pfrc (%d)\n", pfcr); |
| break; |
| } |
| } |
| |
| pte->a = 1; /* Record access to PTE */ |
| pht_insert(badvaddr, pte->pfn); |
| |
| page_table_unlock(AS, true); |
| return; |
| |
| fail: |
| page_table_unlock(AS, true); |
| pht_refill_fail(badvaddr, istate); |
| } |
| |
| |
| void pht_init(void) |
| { |
| memsetb((__address) phte, 1 << PHT_BITS, 0); |
| |
| /* Insert global kernel mapping */ |
| |
| __address cur; |
| for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
| pte_t *pte = page_mapping_find(AS_KERNEL, PA2KA(cur)); |
| if ((pte) && (pte->p) && (pte->g)) |
| pht_insert(PA2KA(cur), pte->pfn); |
| } |
| } |
| |
| |
| void page_arch_init(void) |
| { |
| page_mapping_operations = &pt_mapping_operations; |
| if (config.cpu_active == 1) { |
| page_mapping_operations = &pt_mapping_operations; |
| |
| /* |
| * PA2KA(identity) mapping for all frames until last_frame. |
| */ |
| __address cur; |
| int flags; |
| |
| for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
| flags = PAGE_CACHEABLE; |
| if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size)) |
| flags |= PAGE_GLOBAL; |
| page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
| } |
| |
| /* Allocate page hash table */ |
| phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC)); |
| phte = (phte_t *) PA2KA((__address) physical_phte); |
| |
| ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0); |
| pht_init(); |
| |
| asm volatile ( |
| "mtsdr1 %0\n" |
| : |
| : "r" ((__address) physical_phte) |
| ); |
| |
| /* Invalidate block address translation registers, |
| thus remove the temporary mapping */ |
| // invalidate_bat(); |
| } |
| } |