Changeset e0b241f in mainline for kernel/arch/sparc64/src/mm/tlb.c

Timestamp:

2006-08-31T11:55:19Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

ed166f7

Parents:

beb3926a

Message:

sparc64 work.

• Convert interrupt_vector trap handler and some mm related trap handlers to

use preemptibe_handler(), which is essential for traps coming from userspace.

• Add fast_data_access_protection() handler.

File:

• kernel/arch/sparc64/src/mm/tlb.c (modified) (3 diffs)

kernel/arch/sparc64/src/mm/tlb.c

@@ -55 +55 @@
 static void do_fast_data_access_mmu_miss_fault(istate_t *istate, const char *str);
 static void do_fast_instruction_access_mmu_miss_fault(istate_t *istate, const char *str);
+static void do_fast_data_access_protection_fault(istate_t *istate, const char *str);
 
 char *context_encoding[] = {
@@ -246 +247 @@
 void fast_data_access_protection(int n, istate_t *istate)
 {
-        panic("%s\n", __FUNCTION__);
+        tlb_tag_access_reg_t tag;
+        uintptr_t va;
+        pte_t *t;
+
+        tag.value = dtlb_tag_access_read();
+        va = tag.vpn * PAGE_SIZE;
+
+        page_table_lock(AS, true);
+        t = page_mapping_find(AS, va);
+        if (t && PTE_WRITABLE(t)) {
+                /*
+                 * The mapping was found in the software page hash table and is writable.
+                 * Demap the old mapping and insert an updated mapping into DTLB.
+                 */
+                t->a = true;
+                t->d = true;
+                dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, va);
+                dtlb_pte_copy(t, false);
+                page_table_unlock(AS, true);
+        } else {
+                /*
+                 * Forward the page fault to the address space page fault handler.
+                 */             
+                page_table_unlock(AS, true);
+                if (as_page_fault(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {
+                        do_fast_data_access_protection_fault(istate, __FUNCTION__);
+                }
+        }
 }
 
@@ -298 +326 @@
 }
 
+void do_fast_data_access_protection_fault(istate_t *istate, const char *str)
+{
+        tlb_tag_access_reg_t tag;
+        uintptr_t va;
+        char *tpc_str = get_symtab_entry(istate->tpc);
+
+        tag.value = dtlb_tag_access_read();
+        va = tag.vpn * PAGE_SIZE;
+
+        printf("Faulting page: %p, ASID=%d\n", va, tag.context);
+        printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);
+        panic("%s\n", str);
+}
+
 /** Invalidate all unlocked ITLB and DTLB entries. */
 void tlb_invalidate_all(void)