WebSVN – HelenOS – Diff – /branches/sparc/kernel/arch/sparc64/src/mm/sun4v/tlb.c

 /*
  * Copyright (c) 2005 Jakub Jermar
  * Copyright (c) 2008 Pavel Rimsky
  * 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 <mm/tlb.h>
 #include <mm/as.h>
 #include <mm/asid.h>
 #include <arch/sun4v/hypercall.h>
 #include <arch/mm/frame.h>
 #include <arch/mm/page.h>
 #include <arch/mm/tte.h>
 #include <arch/mm/tlb.h>
 #include <arch/interrupt.h>
 #include <interrupt.h>
 #include <arch.h>
 #include <print.h>
 #include <arch/types.h>
 #include <config.h>
 #include <arch/trap/trap.h>
 #include <arch/trap/exception.h>
 #include <panic.h>
 #include <arch/asm.h>
 #include <arch/cpu.h>
 #include <arch/mm/pagesize.h>
 #ifdef CONFIG_TSB
 #include <arch/mm/tsb.h>
 #endif
 static void itlb_pte_copy(pte_t *);
 static void dtlb_pte_copy(pte_t *, bool);
 static void do_fast_instruction_access_mmu_miss_fault(istate_t *, const char *);
 static void do_fast_data_access_mmu_miss_fault(istate_t *, uint64_t,
     const char *);
 static void do_fast_data_access_protection_fault(istate_t *,
     uint64_t, const char *);
-#if 0
-char *context_encoding[] = {
-    "Primary",
-    "Secondary",
-    "Nucleus",
-    "Reserved"
-};
-#endif
 /*
  * The assembly language routine passes a 64-bit parameter to the Data Access
  * MMU Miss and Data Access protection handlers, the parameter encapsulates
  * a virtual address of the faulting page and the faulting context. The most
  * significant 51 bits represent the VA of the faulting page and the least
  * significant 13 vits represent the faulting context. The following macros
  * extract the page and context out of the 64-bit parameter:
  */
 /* extracts the VA of the faulting page */
 #define DMISS_ADDRESS(page_and_ctx) (((page_and_ctx) >> 13) << 13)
 /* extracts the faulting context */
 #define DMISS_CONTEXT(page_and_ctx) ((page_and_ctx) & 0x1fff)
+/**
+ * Descriptions of fault types from the MMU Fault status area.
+ *
+ * fault_type[i] contains description of error for which the IFT or DFT
+ * field of the MMU fault status area is i.
+ */
+char *fault_types[] = {
+    "unknown",
+    "fast miss",
+    "fast protection",
+    "MMU miss",
+    "invalid RA",
+    "privileged violation",
+    "protection violation",
+    "NFO access",
+    "so page/NFO side effect",
+    "invalid VA",
+    "invalid ASI",
+    "nc atomic",
+    "privileged action",
+    "unknown",
+    "unaligned access",
+    "invalid page size"
+    };
+/** Array of MMU fault status areas. */
+extern mmu_fault_status_area_t mmu_fsas[MAX_NUM_STRANDS];
 /*
  * Invalidate all non-locked DTLB and ITLB entries.
  */
 void tlb_arch_init(void)
+{
     tlb_invalidate_all();
+}
 /** 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)
+{
-#if 0
-    tlb_tag_access_reg_t tag;
-    tlb_data_t data;
+    tte_data_t data;
-    page_address_t pg;
-    frame_address_t fr;
-    pg.address = page;
-    fr.address = frame;
-    tag.context = ASID_KERNEL;
-    tag.vpn = pg.vpn;
-    dtlb_tag_access_write(tag.value);
     data.value = 0;
     data.v = true;
-    data.size = pagesize;
+    data.nfo = false;
+    data.ra = frame >> FRAME_WIDTH;
-    data.pfn = fr.pfn;
+    data.ie = false;
-    data.l = locked;
+    data.e = false;
     data.cp = cacheable;
 #ifdef CONFIG_VIRT_IDX_DCACHE
     data.cv = cacheable;
-#endif /* CONFIG_VIRT_IDX_DCACHE */
-    data.p = true;
-    data.w = true;
-    data.g = false;
-    dtlb_data_in_write(data.value);
 #endif
+    data.p = true;
+    data.x = false;
+    data.w = false;
+    data.size = pagesize;
+    if (locked) {
+        __hypercall_fast4(
+            MMU_MAP_PERM_ADDR, page, 0, data.value, MMU_FLAG_DTLB);
+    } else {
+        __hypercall_hyperfast(
+            page, ASID_KERNEL, data.value, MMU_FLAG_DTLB, 0,
+            MMU_MAP_ADDR);
+    }
+}
 /** Copy PTE to TLB.
+ *
  * @param t         Page Table Entry to be copied.
  * @param ro        If true, the entry will be created read-only, regardless
  *          of its w field.
  */
 void dtlb_pte_copy(pte_t *t, bool ro)
+{
     tte_data_t data;
     data.value = 0;
     data.v = true;
     data.nfo = false;
     data.ra = (t->frame) >> FRAME_WIDTH;
     data.ie = false;
     data.e = false;
     data.cp = t->c;
 #ifdef CONFIG_VIRT_IDX_DCACHE
     data.cv = t->c;
 #endif
     data.p = t->k;
     data.x = false;
     data.w = ro ? false : t->w;
     data.size = PAGESIZE_8K;
     __hypercall_hyperfast(
         t->page, t->as->asid, data.value, MMU_FLAG_DTLB, 0, MMU_MAP_ADDR);
+}
 /** Copy PTE to ITLB.
+ *
  * @param t     Page Table Entry to be copied.
  */
 void itlb_pte_copy(pte_t *t)
+{
     tte_data_t data;
     data.value = 0;
     data.v = true;
     data.nfo = false;
     data.ra = (t->frame) >> FRAME_WIDTH;
     data.ie = false;
     data.e = false;
     data.cp = t->c;
     data.cv = false;
     data.p = t->k;
     data.x = true;
     data.w = false;
     data.size = PAGESIZE_8K;
     __hypercall_hyperfast(
         t->page, t->as->asid, data.value, MMU_FLAG_ITLB, 0, MMU_MAP_ADDR);
+}
 /** ITLB miss handler. */
 void fast_instruction_access_mmu_miss(unative_t unused, istate_t *istate)
+{
     uintptr_t va = ALIGN_DOWN(istate->tpc, PAGE_SIZE);
     pte_t *t;
     page_table_lock(AS, true);
     t = page_mapping_find(AS, va);
     if (t && PTE_EXECUTABLE(t)) {
         /*
          * The mapping was found in the software page hash table.
          * Insert it into ITLB.
          */
         t->a = true;
         itlb_pte_copy(t);
 #ifdef CONFIG_TSB
-        //itsb_pte_copy(t, index);
+        itsb_pte_copy(t);
 #endif
         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_EXEC, istate) == AS_PF_FAULT) {
             do_fast_instruction_access_mmu_miss_fault(istate,
                 __func__);
+        }
+    }
+}
 /** 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.
+ *
  * @param page_and_ctx  A 64-bit value describing the fault. The most
  *          significant 51 bits of the value contain the virtual
  *          address which caused the fault truncated to the page
  *          boundary. The least significant 13 bits of the value
  *          contain the number of the context in which the fault
  *          occurred.
  * @param istate    Interrupted state saved on the stack.
  */
 void fast_data_access_mmu_miss(uint64_t page_and_ctx, istate_t *istate)
+{
     pte_t *t;
     uintptr_t va = DMISS_ADDRESS(page_and_ctx);
     uint16_t ctx = DMISS_CONTEXT(page_and_ctx);
     if (ctx == ASID_KERNEL) {
         if (va == 0) {
             /* NULL access in kernel */
             do_fast_data_access_mmu_miss_fault(istate, page_and_ctx,
                 __func__);
+        }
         do_fast_data_access_mmu_miss_fault(istate, page_and_ctx, "Unexpected "
             "kernel page fault.");
+    }
     page_table_lock(AS, true);
     t = page_mapping_find(AS, va);
     if (t) {
         /*
          * The mapping was found in the software page hash table.
          * Insert it into DTLB.
          */
         t->a = true;
         dtlb_pte_copy(t, true);
 #ifdef CONFIG_TSB
-        //dtsb_pte_copy(t, true);
+        dtsb_pte_copy(t, true);
 #endif
         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_READ, istate) == AS_PF_FAULT) {
             do_fast_data_access_mmu_miss_fault(istate, page_and_ctx,
                 __func__);
+        }
+    }
+}
 /** DTLB protection fault handler.
+ *
  * @param page_and_ctx  A 64-bit value describing the fault. The most
  *          significant 51 bits of the value contain the virtual
  *          address which caused the fault truncated to the page
  *          boundary. The least significant 13 bits of the value
  *          contain the number of the context in which the fault
  *          occurred.
  * @param istate    Interrupted state saved on the stack.
  */
 void fast_data_access_protection(uint64_t page_and_ctx, istate_t *istate)
+{
     pte_t *t;
     uintptr_t va = DMISS_ADDRESS(page_and_ctx);
     uint16_t ctx = DMISS_CONTEXT(page_and_ctx);
     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;
         mmu_demap_page(va, ctx, MMU_FLAG_DTLB);
         dtlb_pte_copy(t, false);
 #ifdef CONFIG_TSB
-        //dtsb_pte_copy(t, false);
+        dtsb_pte_copy(t, false);
 #endif
         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, page_and_ctx,
                 __func__);
+        }
+    }
+}
-/** Print TLB entry (for debugging purposes).
- *
+/*
- * The diag field has been left out in order to make this function more generic
+ * On Niagara this function does not work, as supervisor software is isolated
- * (there is no diag field in US3 architeture).
+ * from the TLB by the hypervisor and has no chance to investigate the TLB
- *
- * @param i     TLB entry number
- * @param t     TLB entry tag
+ * entries.
- * @param d     TLB entry data
  */
-#if 0
-static void print_tlb_entry(int i, tlb_tag_read_reg_t t, tlb_data_t d)
-{
-    printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, "
-        "ie=%d, soft2=%#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.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
-}
-#endif
 void tlb_print(void)
+{
-#if 0
-    int i;
-    tlb_data_t d;
-    tlb_tag_read_reg_t t;
-    printf("I-TLB contents:\n");
+    printf("Operation not possible on Niagara.\n");
-    for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
-        d.value = itlb_data_access_read(i);
-        t.value = itlb_tag_read_read(i);
-        print_tlb_entry(i, t, d);
-    }
-    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);
-        print_tlb_entry(i, t, d);
-    }
-#endif
+}
 void do_fast_instruction_access_mmu_miss_fault(istate_t *istate,
     const char *str)
+{
     fault_if_from_uspace(istate, "%s\n", str);
     dump_istate(istate);
     panic("%s\n", str);
+}
 void do_fast_data_access_mmu_miss_fault(istate_t *istate,
     uint64_t page_and_ctx, const char *str)
+{
     if (DMISS_CONTEXT(page_and_ctx)) {
         fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, DMISS_ADDRESS(page_and_ctx),
             DMISS_CONTEXT(page_and_ctx));
+    }
     dump_istate(istate);
     printf("Faulting page: %p, ASID=%d\n", DMISS_ADDRESS(page_and_ctx), DMISS_CONTEXT(page_and_ctx));
     panic("%s\n", str);
+}
 void do_fast_data_access_protection_fault(istate_t *istate,
     uint64_t page_and_ctx, const char *str)
+{
     if (DMISS_CONTEXT(page_and_ctx)) {
         fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, DMISS_ADDRESS(page_and_ctx),
             DMISS_CONTEXT(page_and_ctx));
+    }
     printf("Faulting page: %p, ASID=%d\n", DMISS_ADDRESS(page_and_ctx), DMISS_CONTEXT(page_and_ctx));
     dump_istate(istate);
     panic("%s\n", str);
+}
+/**
+ * Describes the exact condition which caused the last DMMU fault.
+ */
-void describe_mmu_fault(void)
+void describe_dmmu_fault(void)
+{
+    uint64_t myid;
+    __hypercall_fast_ret1(0, 0, 0, 0, 0, CPU_MYID, &myid);
+    ASSERT(mmu_fsas[myid].dft < 16);
+    printf("condition which caused the fault: %s\n",
+        fault_types[mmu_fsas[myid].dft]);
+}
 /** Invalidate all unlocked ITLB and DTLB entries. */
 void tlb_invalidate_all(void)
+{
     uint64_t errno =  __hypercall_fast3(MMU_DEMAP_ALL, 0, 0,
         MMU_FLAG_DTLB | MMU_FLAG_ITLB);
     if (errno != EOK) {
         panic("Error code = %d.\n", errno);
+    }
+}
 /** Invalidate all ITLB and DTLB entries that belong to specified ASID
  * (Context).
+ *
  * @param asid Address Space ID.
  */
 void tlb_invalidate_asid(asid_t asid)
+{
-#if 0
-    tlb_context_reg_t pc_save, ctx;
     /* switch to nucleus because we are mapped by the primary context */
     nucleus_enter();
-    ctx.v = pc_save.v = mmu_primary_context_read();
-    ctx.context = asid;
-    mmu_primary_context_write(ctx.v);
-    itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);
-    dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);
+    __hypercall_fast4(MMU_DEMAP_CTX, 0, 0, asid,
-    mmu_primary_context_write(pc_save.v);
+        MMU_FLAG_ITLB | MMU_FLAG_DTLB);
     nucleus_leave();
-#endif
+}
 /** 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)
+{
-#if 0
     unsigned int i;
-    tlb_context_reg_t pc_save, ctx;
     /* switch to nucleus because we are mapped by the primary context */
     nucleus_enter();
-    ctx.v = pc_save.v = mmu_primary_context_read();
-    ctx.context = asid;
-    mmu_primary_context_write(ctx.v);
-    for (i = 0; i < cnt * MMU_PAGES_PER_PAGE; i++) {
+    for (i = 0; i < cnt; i++) {
-        itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY,
+        __hypercall_fast5(MMU_DEMAP_PAGE, 0, 0, page, asid,
-            page + i * MMU_PAGE_SIZE);
-        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY,
-            page + i * MMU_PAGE_SIZE);
+            MMU_FLAG_DTLB | MMU_FLAG_ITLB);
+    }
-    mmu_primary_context_write(pc_save.v);
     nucleus_leave();
-#endif
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)/branches/sparc/kernel/arch/sparc64/src/mm/sun4v/tlb.c @ 3862 – Rev 3993 → 4129