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

 /*
  * Copyright (C) 2005 Jakub Jermar
  * 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.
  */
 /** @addtogroup sparc64mm
  * @{
  */
 /** @file
  */
 #include <arch/mm/tlb.h>
 #include <mm/tlb.h>
+#include <mm/as.h>
+#include <mm/asid.h>
 #include <arch/mm/frame.h>
 #include <arch/mm/page.h>
 #include <arch/mm/mmu.h>
+#include <arch/interrupt.h>
-#include <mm/asid.h>
+#include <arch.h>
 #include <print.h>
 #include <arch/types.h>
 #include <typedefs.h>
 #include <config.h>
 #include <arch/trap/trap.h>
 #include <panic.h>
 #include <arch/asm.h>
 #include <symtab.h>
+static void dtlb_pte_copy(pte_t *t);
+static void do_fast_data_access_mmu_miss_fault(istate_t *istate, const char *str);
 char *context_encoding[] = {
     "Primary",
     "Secondary",
     "Nucleus",
     "Reserved"
 };
 void tlb_arch_init(void)
+{
     /*
      * TLBs are actually initialized early
      * in start.S.
      */
+}
 /** Insert privileged mapping into DMMU TLB.
+ *
  * @param page Virtual page address.
  * @param frame Physical frame address.
  * @param pagesize Page size.
  * @param locked True for permanent mappings, false otherwise.
  * @param cacheable True if the mapping is cacheable, false otherwise.
  */
 void dtlb_insert_mapping(uintptr_t page, uintptr_t frame, int pagesize, bool locked, bool cacheable)
+{
     tlb_tag_access_reg_t tag;
     tlb_data_t data;
     page_address_t pg;
     frame_address_t fr;
     pg.address = page;
     fr.address = frame;
     tag.value = ASID_KERNEL;
     tag.vpn = pg.vpn;
     dtlb_tag_access_write(tag.value);
     data.value = 0;
     data.v = true;
     data.size = pagesize;
     data.pfn = fr.pfn;
     data.l = locked;
     data.cp = cacheable;
     data.cv = cacheable;
     data.p = true;
     data.w = true;
     data.g = true;
     dtlb_data_in_write(data.value);
+}
+void dtlb_pte_copy(pte_t *t)
+{
+}
 /** ITLB miss handler. */
-void fast_instruction_access_mmu_miss(void)
+void fast_instruction_access_mmu_miss(int n, istate_t *istate)
+{
     panic("%s\n", __FUNCTION__);
+}
-/** DTLB miss handler. */
+/** DTLB miss handler.
+ *
+ * Note that some faults (e.g. kernel faults) were already resolved
+ * by the low-level, assembly language part of the fast_data_access_mmu_miss
+ * handler.
+ */
-void fast_data_access_mmu_miss(void)
+void fast_data_access_mmu_miss(int n, istate_t *istate)
+{
     tlb_tag_access_reg_t tag;
-    uintptr_t tpc;
+    uintptr_t va;
-    char *tpc_str;
+    pte_t *t;
     tag.value = dtlb_tag_access_read();
+    va = tag.vpn * PAGE_SIZE;
-    if (tag.context != ASID_KERNEL || tag.vpn == 0) {
+    if (tag.context == ASID_KERNEL) {
-        tpc = tpc_read();
+        if (!tag.vpn) {
-        tpc_str = get_symtab_entry(tpc);
+            /* NULL access in kernel */
+            do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);
+        }
-        printf("Faulting page: %p, ASID=%d\n", tag.vpn * PAGE_SIZE, tag.context);
+        do_fast_data_access_mmu_miss_fault(istate, "Unexpected kernel page fault.");
-        printf("TPC=%p, (%s)\n", tpc, tpc_str ? tpc_str : "?");
-        panic("%s\n", __FUNCTION__);
+    }
+    page_table_lock(AS, true);
+    t = page_mapping_find(AS, va);
+    if (t) {
-    /*
+        /*
-     * Identity map piece of faulting kernel address space.
+         * The mapping was found in the software page hash table.
+         * Insert it into DTLB.
-     */
+         */
+        dtlb_pte_copy(t);
+        page_table_unlock(AS, true);
+    } else {
+        /*
-    dtlb_insert_mapping(tag.vpn * PAGE_SIZE, tag.vpn * FRAME_SIZE, PAGESIZE_8K, false, true);
+         * 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) {
+            do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);
+        }
+    }
+}
 /** DTLB protection fault handler. */
-void fast_data_access_protection(void)
+void fast_data_access_protection(int n, istate_t *istate)
+{
     panic("%s\n", __FUNCTION__);
+}
 /** Print contents of both TLBs. */
 void tlb_print(void)
+{
     int i;
     tlb_data_t d;
     tlb_tag_read_reg_t t;
     printf("I-TLB contents:\n");
     for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
         d.value = itlb_data_access_read(i);
         t.value = itlb_tag_read_read(i);
         printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
             i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
+    }
     printf("D-TLB contents:\n");
     for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
         d.value = dtlb_data_access_read(i);
         t.value = dtlb_tag_read_read(i);
         printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
             i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
+    }
+}
+void do_fast_data_access_mmu_miss_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)
+{
     int i;
     tlb_data_t d;
     tlb_tag_read_reg_t t;
     for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
         d.value = itlb_data_access_read(i);
         if (!d.l) {
             t.value = itlb_tag_read_read(i);
             d.v = false;
             itlb_tag_access_write(t.value);
             itlb_data_access_write(i, d.value);
+        }
+    }
     for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
         d.value = dtlb_data_access_read(i);
         if (!d.l) {
             t.value = dtlb_tag_read_read(i);
             d.v = false;
             dtlb_tag_access_write(t.value);
             dtlb_data_access_write(i, d.value);
+        }
+    }
+}
 /** Invalidate all ITLB and DTLB entries that belong to specified ASID (Context).
+ *
  * @param asid Address Space ID.
  */
 void tlb_invalidate_asid(asid_t asid)
+{
     /* TODO: write asid to some Context register and encode the register in second parameter below. */
     itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_NUCLEUS, 0);
     dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_NUCLEUS, 0);
+}
 /** Invalidate all ITLB and DTLB entries for specified page range in specified address space.
+ *
  * @param asid Address Space ID.
  * @param page First page which to sweep out from ITLB and DTLB.
  * @param cnt Number of ITLB and DTLB entries to invalidate.
  */
 void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)
+{
     int i;
     for (i = 0; i < cnt; i++) {
         /* TODO: write asid to some Context register and encode the register in second parameter below. */
         itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, page + i * PAGE_SIZE);
         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, page + i * PAGE_SIZE);
+    }
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/sparc64/src/mm/tlb.c – Rev 1842 → 1851