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Line 65... Line 65...
65 
 * @param pfrc     Pointer to variable where as_page_fault() return code will be stored.
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 * @param pfrc     Pointer to variable where as_page_fault() return code will be stored.
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 * @return         PTE on success, NULL otherwise.
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 * @return         PTE on success, NULL otherwise.
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 *
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 *
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 */
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 */
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static pte_t *find_mapping_and_check(as_t *as, bool lock, __address badvaddr, int access,
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static pte_t *find_mapping_and_check(as_t *as, bool lock, __address badvaddr, int access,
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                     istate_t *istate, int *pfcr)
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                     istate_t *istate, int *pfrc)
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{
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{
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    /*
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    /*
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     * Check if the mapping exists in page tables.
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     * Check if the mapping exists in page tables.
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     */
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     */
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    pte_t *pte = page_mapping_find(as, badvaddr);
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    pte_t *pte = page_mapping_find(as, badvaddr);
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                pte = page_mapping_find(as, badvaddr);
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                pte = page_mapping_find(as, badvaddr);
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                ASSERT((pte) && (pte->p));
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                ASSERT((pte) && (pte->p));
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                return pte;
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                return pte;
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            case AS_PF_DEFER:
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            case AS_PF_DEFER:
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                page_table_lock(as, lock);
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                page_table_lock(as, lock);
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                *pfcr = rc;
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                *pfrc = rc;
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                return NULL;
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                return NULL;
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            case AS_PF_FAULT:
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            case AS_PF_FAULT:
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                page_table_lock(as, lock);
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                page_table_lock(as, lock);
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                printf("Page fault.\n");
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                printf("Page fault.\n");
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                *pfcr = rc;
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                *pfrc = rc;
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                return NULL;
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                return NULL;
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            default:
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            default:
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                panic("unexpected rc (%d)\n", rc);
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                panic("unexpected rc (%d)\n", rc);
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        }  
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        }  
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    }
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    }
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}
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}
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/** Process Instruction/Data Storage Interrupt
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/** Process Instruction/Data Storage Interrupt
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 *
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 *
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 * @param data   True if Data Storage Interrupt.
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 * @param n Interrupt vector number.
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 * @param istate Interrupted register context.
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 * @param istate Interrupted register context.
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 *
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 *
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 */
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 */
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void pht_refill(int n, istate_t *istate)
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void pht_refill(int n, istate_t *istate)
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{
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{
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    __address badvaddr;
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    __address badvaddr;
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    pte_t *pte;
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    pte_t *pte;
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    int pfcr;
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    int pfrc;
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    as_t *as;
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    as_t *as;
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    bool lock;
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    bool lock;
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    if (AS == NULL) {
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    if (AS == NULL) {
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        as = AS_KERNEL;
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        as = AS_KERNEL;
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    } else
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    } else
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        badvaddr = istate->pc;
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        badvaddr = istate->pc;
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    page_table_lock(as, lock);
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    page_table_lock(as, lock);
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    pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfcr);
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    pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfrc);
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    if (!pte) {
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    if (!pte) {
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        switch (pfcr) {
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        switch (pfrc) {
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            case AS_PF_FAULT:
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            case AS_PF_FAULT:
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                goto fail;
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                goto fail;
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                break;
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                break;
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            case AS_PF_DEFER:
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            case AS_PF_DEFER:
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                /*
 230 
                /*
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                 * or copy_to_uspace().
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                 * or copy_to_uspace().
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                 */
 233 
                 */
234 
                page_table_unlock(as, lock);
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                page_table_unlock(as, lock);
235 
                return;
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                return;
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            default:
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            default:
237 
                panic("Unexpected pfrc (%d)\n", pfcr);
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                panic("Unexpected pfrc (%d)\n", pfrc);
238 
        }
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        }
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    }
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    }
240 
   
 240 
   
241 
    pte->a = 1; /* Record access to PTE */
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    pte->a = 1; /* Record access to PTE */
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    pht_insert(badvaddr, pte->pfn);
 242 
    pht_insert(badvaddr, pte->pfn);