WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ppc32/src/mm/tlb.c

 /*
  * Copyright (C) 2006 Martin Decky
  * 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.
  */
 #include <arch/mm/tlb.h>
 #include <arch/types.h>
 #include <mm/tlb.h>
+#include <mm/frame.h>
 #include <mm/page.h>
 #include <mm/as.h>
 #include <arch.h>
 #include <print.h>
 #include <symtab.h>
+static phte_t *phte;
 /** Initialize Page Hash Table.
+ *
  * Setup the Page Hash Table with no entries.
+ *
  */
 void tlb_arch_init(void)
+{
+    phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC));
+    phte =(phte_t *) PA2KA((__address) physical_phte);
+    ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
+    memsetb((__address) phte, 1 << PHT_BITS, 0);
+    asm volatile (
+        "mtsdr1 %0\n"
+        :
+        : "r" ((__address) physical_phte)
+    );
+}
 /** Try to find PTE for faulting address
+ *
  * Try to find PTE for faulting address.
  * The AS->lock must be held on entry to this function.
+ *
  * @param badvaddr Faulting virtual address.
  * @return         PTE on success, NULL otherwise.
+ *
  */
 static pte_t *find_mapping_and_check(__address badvaddr)
+{
     /*
      * Check if the mapping exists in page tables.
      */
     pte_t *pte = page_mapping_find(AS, badvaddr);
     if ((pte) && (pte->p)) {
         /*
          * Mapping found in page tables.
          * Immediately succeed.
          */
         return pte;
     } else {
         /*
          * Mapping not found in page tables.
          * Resort to higher-level page fault handler.
          */
         page_table_unlock(AS, true);
         if (as_page_fault(badvaddr)) {
             /*
              * The higher-level page fault handler succeeded,
              * The mapping ought to be in place.
              */
             page_table_lock(AS, true);
             pte = page_mapping_find(AS, badvaddr);
             ASSERT((pte) && (pte->p));
             return pte;
         } else {
             page_table_lock(AS, true);
             printf("Page fault.\n");
             return NULL;
+        }
+    }
+}
 static void pht_refill_fail(__address badvaddr, istate_t *istate)
+{
     char *symbol = "";
     char *sym2 = "";
     char *s = get_symtab_entry(istate->pc);
     if (s)
         symbol = s;
     s = get_symtab_entry(istate->lr);
     if (s)
         sym2 = s;
-    panic("%X: PHT Refill Exception at %X(%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
+    panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
+}
-/** Process Data Storage Interrupt
+/** Process Instruction/Data Storage Interrupt
+ *
+ * @param data   True if Data Storage Interrupt.
  * @param istate Interrupted register context.
+ *
  */
-void pht_refill(istate_t *istate)
+void pht_refill(bool data, istate_t *istate)
+{
     asid_t asid;
     __address badvaddr;
     pte_t *pte;
+    __u32 page;
+    __u32 api;
+    __u32 vsid;
+    __u32 hash;
+    __u32 i;
+    if (data) {
-    __asm__ volatile (
+        asm volatile (
-        "mfdar %0\n"
+            "mfdar %0\n"
-        : "=r" (badvaddr)
+            : "=r" (badvaddr)
-    );
+        );
+    } else
+        badvaddr = istate->pc;
     spinlock_lock(&AS->lock);
     asid = AS->asid;
     spinlock_unlock(&AS->lock);
     page_table_lock(AS, true);
     pte = find_mapping_and_check(badvaddr);
     if (!pte)
         goto fail;
-    /*
-     * Record access to PTE.
+    /* Record access to PTE */
-     */
     pte->a = 1;
+    page = ADDR2PFN(badvaddr);
+    api = (badvaddr >> 22) & 0x3f;
+    asm volatile (
+        "mfsrin %0, %1\n"
+        : "=r" (vsid)
+        : "r" (badvaddr >> 28)
+    );
+    /* Primary hash (xor) */
+    hash = ((vsid ^ page) & 0x3ff) << 3;
-    // FIXME: Insert entry into PHT
+    /* Find invalid PTE in PTEG */
+    for (i = 0; i < 8; i++) {
+        if (!phte[hash + i].v)
+            break;
+    }
+    // TODO: Check access/change bits, secondary hash
+    if (i == 8)
+        i = page % 8;
+    phte[hash + i].v = 1;
+    phte[hash + i].vsid = vsid;
+    phte[hash + i].h = 0;
+    phte[hash + i].api = api;
+    phte[hash + i].rpn = pte->pfn;
+    phte[hash + i].r = 0;
+    phte[hash + i].c = 0;
+    phte[hash + i].pp = 2; // FIXME
     page_table_unlock(AS, true);
     return;
 fail:
     page_table_unlock(AS, true);
     pht_refill_fail(badvaddr, istate);
+}
 /** Print contents of Page Hash Table. */
 void tlb_print(void)
+{
+}

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ppc32/src/mm/tlb.c @ 1373 – Rev 1215 → 1269