| 0,0 → 1,155 |
|---|
| /* |
| * Copyright (C) 2006 Martin Decky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <arch/mm/tlb.h> |
| #include <arch/types.h> |
| #include <mm/tlb.h> |
| #include <mm/page.h> |
| #include <mm/as.h> |
| #include <arch.h> |
| #include <print.h> |
| #include <symtab.h> |
| |
| |
| /** Initialize Page Hash Table. |
| * |
| * Setup the Page Hash Table with no entries. |
| * |
| */ |
| void tlb_arch_init(void) |
| { |
| } |
| |
| |
| /** 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. |
| * @return PTE on success, NULL otherwise. |
| * |
| */ |
| static pte_t *find_mapping_and_check(__address badvaddr) |
| { |
| /* |
| * 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 { |
| /* |
| * Mapping not found in page tables. |
| * Resort to higher-level page fault handler. |
| */ |
| page_table_unlock(AS, true); |
| if (as_page_fault(badvaddr)) { |
| /* |
| * 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; |
| } else { |
| page_table_lock(AS, true); |
| printf("Page fault.\n"); |
| return NULL; |
| } |
| |
| } |
| } |
| |
| |
| 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("%X: PHT Refill Exception at %X(%s<-%s)\n", badvaddr, istate->pc, symbol, sym2); |
| } |
| |
| |
| /** Process Data Storage Interrupt |
| * |
| * @param istate Interrupted register context. |
| * |
| */ |
| void pht_refill(istate_t *istate) |
| { |
| asid_t asid; |
| __address badvaddr; |
| pte_t *pte; |
| |
| __asm__ volatile ( |
| "mfdar %0\n" |
| : "=r" (badvaddr) |
| ); |
| |
| spinlock_lock(&AS->lock); |
| asid = AS->asid; |
| spinlock_unlock(&AS->lock); |
| |
| page_table_lock(AS, true); |
| |
| pte = find_mapping_and_check(badvaddr); |
| if (!pte) |
| goto fail; |
| |
| /* |
| * Record access to PTE. |
| */ |
| pte->a = 1; |
| |
| // FIXME: Insert entry into PHT |
| |
| page_table_unlock(AS, true); |
| return; |
| |
| fail: |
| page_table_unlock(AS, true); |
| pht_refill_fail(badvaddr, istate); |
| } |
| |
| |
| /** Print contents of Page Hash Table. */ |
| void tlb_print(void) |
| { |
| } |