WebSVN – HelenOS-historic – Diff – //kernel/trunk/arch/ia64/src/mm/tlb.c

  * TLB management.
  */
 #include <mm/tlb.h>
 #include <mm/asid.h>
+#include <mm/page.h>
+#include <mm/as.h>
 #include <arch/mm/tlb.h>
 #include <arch/mm/page.h>
 #include <arch/barrier.h>
 #include <arch/interrupt.h>
 #include <typedefs.h>
 #include <panic.h>
-#include <print.h>
+#include <arch.h>
 /** Invalidate all TLB entries. */
 void tlb_invalidate_all(void)
+{
     /* TODO */
 void tc_mapping_insert(__address va, asid_t asid, tlb_entry_t entry, bool dtc)
+{
     region_register rr;
     bool restore_rr = false;
-    if (!(entry.p))
-        return;
     rr.word = rr_read(VA2VRN(va));
     if ((restore_rr = (rr.map.rid != ASID2RID(asid, VA2VRN(va))))) {
         /*
          * The selected region register does not contain required RID.
          * Save the old content of the register and replace the RID.
 void tr_mapping_insert(__address va, asid_t asid, tlb_entry_t entry, bool dtr, index_t tr)
+{
     region_register rr;
     bool restore_rr = false;
-    if (!(entry.p))
-        return;
     rr.word = rr_read(VA2VRN(va));
     if ((restore_rr = (rr.map.rid != ASID2RID(asid, VA2VRN(va))))) {
         /*
          * The selected region register does not contain required RID.
          * Save the old content of the register and replace the RID.
  * @param asid Address space identifier.
  * @param entry The rest of TLB entry as required by TLB insertion format.
  * @param dtr If true, insert into data translation register, use data translation cache otherwise.
  * @param tr Translation register if dtr is true, ignored otherwise.
  */
-void dtlb_mapping_insert(__address page, __address frame, bool dtr, index_t tr)
+void dtlb_kernel_mapping_insert(__address page, __address frame, bool dtr, index_t tr)
+{
     tlb_entry_t entry;
     entry.word[0] = 0;
     entry.word[1] = 0;
         dtr_mapping_insert(page, ASID_KERNEL, entry, tr);
     else
         dtc_mapping_insert(page, ASID_KERNEL, entry);
+}
+/** Copy content of PTE into data translation cache.
+ *
+ * @param t PTE.
+ */
+void dtc_pte_copy(pte_t *t)
+{
+    tlb_entry_t entry;
+    entry.word[0] = 0;
+    entry.word[1] = 0;
+    entry.p = t->p;
+    entry.ma = t->c ? MA_WRITEBACK : MA_UNCACHEABLE;
+    entry.a = t->a;
+    entry.d = t->d;
+    entry.pl = t->k ? PL_KERNEL : PL_USER;
+    entry.ar = t->w ? AR_WRITE : AR_READ;
+    entry.ppn = t->frame >> PPN_SHIFT;
+    entry.ps = PAGE_WIDTH;
+    dtc_mapping_insert(t->page, t->as->asid, entry);
+}
+/** Copy content of PTE into instruction translation cache.
+ *
+ * @param t PTE.
+ */
+void itc_pte_copy(pte_t *t)
+{
+    tlb_entry_t entry;
+    entry.word[0] = 0;
+    entry.word[1] = 0;
+    ASSERT(t->x);
+    entry.p = t->p;
+    entry.ma = t->c ? MA_WRITEBACK : MA_UNCACHEABLE;
+    entry.a = t->a;
+    entry.pl = t->k ? PL_KERNEL : PL_USER;
+    entry.ar = t->x ? (AR_EXECUTE | AR_READ) : AR_READ;
+    entry.ppn = t->frame >> PPN_SHIFT;
+    entry.ps = PAGE_WIDTH;
+    itc_mapping_insert(t->page, t->as->asid, entry);
+}
+/** Instruction TLB fault handler for faults with VHPT turned off.
+ *
+ * @param vector Interruption vector.
+ * @param pstate Structure with saved interruption state.
+ */
 void alternate_instruction_tlb_fault(__u64 vector, struct exception_regdump *pstate)
+{
+    region_register rr;
+    __address va;
+    pte_t *t;
+    va = pstate->cr_ifa;    /* faulting address */
-    panic("%s\n", __FUNCTION__);
+    t = page_mapping_find(AS, va);
+    if (t) {
+        /*
+         * The mapping was found in software page hash table.
+         * Insert it into data translation cache.
+         */
+        itc_pte_copy(t);
+    } else {
+        /*
+         * Forward the page fault to address space page fault handler.
+         */
+        if (!as_page_fault(va)) {
+            panic("%s: va=%P, rid=%d\n", __FUNCTION__, pstate->cr_ifa, rr.map.rid);
+        }
+    }
+}
-/** Data TLB fault with VHPT turned off.
+/** Data TLB fault handler for faults with VHPT turned off.
+ *
  * @param vector Interruption vector.
  * @param pstate Structure with saved interruption state.
  */
 void alternate_data_tlb_fault(__u64 vector, struct exception_regdump *pstate)
+{
     region_register rr;
     rid_t rid;
     __address va;
+    pte_t *t;
     va = pstate->cr_ifa;    /* faulting address */
     rr.word = rr_read(VA2VRN(va));
     rid = rr.map.rid;
     if (RID2ASID(rid) == ASID_KERNEL) {
         if (VA2VRN(va) == VRN_KERNEL) {
             /*
              * Provide KA2PA(identity) mapping for faulting piece of
              * kernel address space.
              */
-            dtlb_mapping_insert(va, KA2PA(va), false, 0);
+            dtlb_kernel_mapping_insert(va, KA2PA(va), false, 0);
             return;
+        }
+    }
+    t = page_mapping_find(AS, va);
+    if (t) {
+        /*
+         * The mapping was found in software page hash table.
+         * Insert it into data translation cache.
+         */
+        dtc_pte_copy(t);
+    } else {
+        /*
+         * Forward the page fault to address space page fault handler.
+         */
+        if (!as_page_fault(va)) {
-    panic("%s: va=%P, rid=%d\n", __FUNCTION__, pstate->cr_ifa, rr.map.rid);
+            panic("%s: va=%P, rid=%d\n", __FUNCTION__, pstate->cr_ifa, rr.map.rid);
+        }
+    }
+}
+/** Data nested TLB fault handler.
+ *
+ * This fault should not occur.
+ *
+ * @param vector Interruption vector.
+ * @param pstate Structure with saved interruption state.
+ */
 void data_nested_tlb_fault(__u64 vector, struct exception_regdump *pstate)
+{
     panic("%s\n", __FUNCTION__);
+}
+/** Data Dirty bit fault handler.
+ *
+ * @param vector Interruption vector.
+ * @param pstate Structure with saved interruption state.
+ */
 void data_dirty_bit_fault(__u64 vector, struct exception_regdump *pstate)
+{
+    pte_t *t;
-    panic("%s\n", __FUNCTION__);
+    t = page_mapping_find(AS, pstate->cr_ifa);
+    ASSERT(t && t->p);
+    if (t && t->p) {
+        /*
+         * Update the Dirty bit in page tables and reinsert
+         * the mapping into DTC.
+         */
+        t->d = true;
+        dtc_pte_copy(t);
+    }
+}
+/** Instruction access bit fault handler.
+ *
+ * @param vector Interruption vector.
+ * @param pstate Structure with saved interruption state.
+ */
 void instruction_access_bit_fault(__u64 vector, struct exception_regdump *pstate)
+{
+    pte_t *t;
-    panic("%s\n", __FUNCTION__);
+    t = page_mapping_find(AS, pstate->cr_ifa);
+    ASSERT(t && t->p);
+    if (t && t->p) {
+        /*
+         * Update the Accessed bit in page tables and reinsert
+         * the mapping into ITC.
+         */
+        t->a = true;
+        itc_pte_copy(t);
+    }
+}
+/** Data access bit fault handler.
+ *
+ * @param vector Interruption vector.
+ * @param pstate Structure with saved interruption state.
+ */
 void data_access_bit_fault(__u64 vector, struct exception_regdump *pstate)
+{
+    pte_t *t;
-    panic("%s\n", __FUNCTION__);
+    t = page_mapping_find(AS, pstate->cr_ifa);
+    ASSERT(t && t->p);
+    if (t && t->p) {
+        /*
+         * Update the Accessed bit in page tables and reinsert
+         * the mapping into DTC.
+         */
+        t->a = true;
+        dtc_pte_copy(t);
+    }
+}
+/** Page not present fault handler.
+ *
+ * @param vector Interruption vector.
+ * @param pstate Structure with saved interruption state.
+ */
 void page_not_present(__u64 vector, struct exception_regdump *pstate)
+{
+    region_register rr;
+    __address va;
+    pte_t *t;
+    va = pstate->cr_ifa;    /* faulting address */
-    panic("%s\n", __FUNCTION__);
+    t = page_mapping_find(AS, va);
+    ASSERT(t);
+    if (t->p) {
+        /*
+         * If the Present bit is set in page hash table, just copy it
+         * and update ITC/DTC.
+         */
+        if (t->x)
+            itc_pte_copy(t);
+        else
+            dtc_pte_copy(t);
+    } else {
+        if (!as_page_fault(va)) {
+            panic("%s: va=%P, rid=%d\n", __FUNCTION__, pstate->cr_ifa, rr.map.rid);
+        }
+    }
+}

Subversion Repositories HelenOS-historic

(root)//kernel/trunk/arch/ia64/src/mm/tlb.c – Rev 901 → 902