WebSVN – HelenOS – Diff – /branches/tracing/kernel/arch/sparc64/src/mm/tlb.c

+}
 /** ITLB miss handler. */
 void fast_instruction_access_mmu_miss(unative_t unused, istate_t *istate)
+{
-    uintptr_t va = ALIGN_DOWN(istate->tpc, PAGE_SIZE);
+    uintptr_t page_16k = ALIGN_DOWN(istate->tpc, PAGE_SIZE);
     index_t index = (istate->tpc >> MMU_PAGE_WIDTH) % MMU_PAGES_PER_PAGE;
     pte_t *t;
     page_table_lock(AS, true);
-    t = page_mapping_find(AS, va);
+    t = page_mapping_find(AS, page_16k);
     if (t && PTE_EXECUTABLE(t)) {
         /*
          * The mapping was found in the software page hash table.
          * Insert it into ITLB.
          */
         /*
          * Forward the page fault to the address space page fault
          * handler.
          */
         page_table_unlock(AS, true);
-        if (as_page_fault(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {
+        if (as_page_fault(page_16k, PF_ACCESS_EXEC, istate) ==
+            AS_PF_FAULT) {
             do_fast_instruction_access_mmu_miss_fault(istate,
                 __func__);
+        }
+    }
+}
  *          DTLB miss.
  * @param istate    Interrupted state saved on the stack.
  */
 void fast_data_access_mmu_miss(tlb_tag_access_reg_t tag, istate_t *istate)
+{
-    uintptr_t va;
+    uintptr_t page_8k;
+    uintptr_t page_16k;
     index_t index;
     pte_t *t;
-    va = ALIGN_DOWN((uint64_t) tag.vpn << MMU_PAGE_WIDTH, PAGE_SIZE);
+    page_8k = (uint64_t) tag.vpn << MMU_PAGE_WIDTH;
+    page_16k = ALIGN_DOWN(page_8k, PAGE_SIZE);
     index = tag.vpn % MMU_PAGES_PER_PAGE;
     if (tag.context == ASID_KERNEL) {
         if (!tag.vpn) {
             /* NULL access in kernel */
             do_fast_data_access_mmu_miss_fault(istate, tag,
                 __func__);
+        } else if (page_8k >= end_of_identity) {
+            /*
+             * The kernel is accessing the I/O space.
+             * We still do identity mapping for I/O,
+             * but without caching.
+             */
+            dtlb_insert_mapping(page_8k, KA2PA(page_8k),
+                PAGESIZE_8K, false, false);
+            return;
+        }
         do_fast_data_access_mmu_miss_fault(istate, tag, "Unexpected "
             "kernel page fault.");
+    }
     page_table_lock(AS, true);
-    t = page_mapping_find(AS, va);
+    t = page_mapping_find(AS, page_16k);
     if (t) {
         /*
          * The mapping was found in the software page hash table.
          * Insert it into DTLB.
          */
         /*
          * Forward the page fault to the address space page fault
          * handler.
          */
         page_table_unlock(AS, true);
-        if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
+        if (as_page_fault(page_16k, PF_ACCESS_READ, istate) ==
+            AS_PF_FAULT) {
             do_fast_data_access_mmu_miss_fault(istate, tag,
                 __func__);
+        }
+    }
+}
  *          DTLB miss.
  * @param istate    Interrupted state saved on the stack.
  */
 void fast_data_access_protection(tlb_tag_access_reg_t tag, istate_t *istate)
+{
-    uintptr_t va;
+    uintptr_t page_16k;
     index_t index;
     pte_t *t;
-    va = ALIGN_DOWN((uint64_t) tag.vpn << MMU_PAGE_WIDTH, PAGE_SIZE);
+    page_16k = ALIGN_DOWN((uint64_t) tag.vpn << MMU_PAGE_WIDTH, PAGE_SIZE);
     index = tag.vpn % MMU_PAGES_PER_PAGE;   /* 16K-page emulation */
     page_table_lock(AS, true);
-    t = page_mapping_find(AS, va);
+    t = page_mapping_find(AS, page_16k);
     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 + index * MMU_PAGE_SIZE);
+            page_16k + index * MMU_PAGE_SIZE);
         dtlb_pte_copy(t, index, false);
 #ifdef CONFIG_TSB
         dtsb_pte_copy(t, index, false);
 #endif
         page_table_unlock(AS, true);
         /*
          * 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) {
+        if (as_page_fault(page_16k, PF_ACCESS_WRITE, istate) ==
+            AS_PF_FAULT) {
             do_fast_data_access_protection_fault(istate, tag,
                 __func__);
+        }
+    }
+}
 #endif
 void do_fast_instruction_access_mmu_miss_fault(istate_t *istate,
     const char *str)
+{
-    fault_if_from_uspace(istate, "%s\n", str);
+    fault_if_from_uspace(istate, "%s.", str);
     dump_istate(istate);
-    panic("%s\n", str);
+    panic("%s.", str);
+}
 void do_fast_data_access_mmu_miss_fault(istate_t *istate,
     tlb_tag_access_reg_t tag, const char *str)
+{
     uintptr_t va;
     va = tag.vpn << MMU_PAGE_WIDTH;
     if (tag.context) {
-        fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, va,
+        fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d).", str, va,
             tag.context);
+    }
     dump_istate(istate);
-    printf("Faulting page: %p, ASID=%d\n", va, tag.context);
+    printf("Faulting page: %p, ASID=%d.\n", va, tag.context);
-    panic("%s\n", str);
+    panic("%s.", str);
+}
 void do_fast_data_access_protection_fault(istate_t *istate,
     tlb_tag_access_reg_t tag, const char *str)
+{
     uintptr_t va;
     va = tag.vpn << MMU_PAGE_WIDTH;
     if (tag.context) {
-        fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, va,
+        fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d).", str, va,
             tag.context);
+    }
     printf("Faulting page: %p, ASID=%d\n", va, tag.context);
     dump_istate(istate);
-    panic("%s\n", str);
+    panic("%s.", str);
+}
 void dump_sfsr_and_sfar(void)
+{
     tlb_sfsr_reg_t sfsr;

Subversion Repositories HelenOS

(root)/branches/tracing/kernel/arch/sparc64/src/mm/tlb.c @ 3675 – Rev 3675 → 4377