patch-2.4.10 linux/arch/ppc/mm/tlb.c
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- Lines: 163
- Date:
Tue Aug 28 06:58:33 2001
- Orig file:
v2.4.9/linux/arch/ppc/mm/tlb.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/arch/ppc/mm/tlb.c linux/arch/ppc/mm/tlb.c
@@ -0,0 +1,162 @@
+/*
+ * BK Id: %F% %I% %G% %U% %#%
+ */
+/*
+ * This file contains the routines for TLB flushing.
+ * On machines where the MMU uses a hash table to store virtual to
+ * physical translations, these routines flush entries from the the
+ * hash table also.
+ * -- paulus
+ *
+ * Derived from arch/ppc/mm/init.c:
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
+ * and Cort Dougan (PReP) (cort@cs.nmt.edu)
+ * Copyright (C) 1996 Paul Mackerras
+ * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
+ *
+ * Derived from "arch/i386/mm/init.c"
+ * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+
+#include "mmu_decl.h"
+
+/*
+ * TLB flushing:
+ *
+ * - flush_tlb_all() flushes all processes TLBs
+ * - flush_tlb_mm(mm) flushes the specified mm context TLB's
+ * - flush_tlb_page(vma, vmaddr) flushes one page
+ * - flush_tlb_range(mm, start, end) flushes a range of pages
+ *
+ * since the hardware hash table functions as an extension of the
+ * tlb as far as the linux tables are concerned, flush it too.
+ * -- Cort
+ */
+
+/*
+ * Flush all tlb/hash table entries (except perhaps for those
+ * mapping RAM starting at PAGE_OFFSET, since they never change).
+ */
+void
+local_flush_tlb_all(void)
+{
+ /* aargh!!! */
+ /*
+ * Just flush the kernel part of the address space, that's
+ * all that the current callers of this require.
+ * Eventually I hope to persuade the powers that be that
+ * we can and should dispense with flush_tlb_all().
+ * -- paulus.
+ */
+ local_flush_tlb_range(&init_mm, TASK_SIZE, ~0UL);
+
+#ifdef CONFIG_SMP
+ smp_send_tlb_invalidate(0);
+#endif /* CONFIG_SMP */
+}
+
+/*
+ * Flush all the (user) entries for the address space described
+ * by mm. We can't rely on mm->mmap describing all the entries
+ * that might be in the hash table.
+ */
+void
+local_flush_tlb_mm(struct mm_struct *mm)
+{
+ if (Hash == 0) {
+ _tlbia();
+ return;
+ }
+
+ if (mm->map_count) {
+ struct vm_area_struct *mp;
+ for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
+ local_flush_tlb_range(mm, mp->vm_start, mp->vm_end);
+ } else
+ local_flush_tlb_range(mm, 0, TASK_SIZE);
+
+#ifdef CONFIG_SMP
+ smp_send_tlb_invalidate(0);
+#endif
+}
+
+void
+local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
+{
+ struct mm_struct *mm;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ if (Hash == 0) {
+ _tlbie(vmaddr);
+ return;
+ }
+ mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
+ pmd = pmd_offset(pgd_offset(mm, vmaddr), vmaddr);
+ if (!pmd_none(*pmd)) {
+ pte = pte_offset(pmd, vmaddr);
+ if (pte_val(*pte) & _PAGE_HASHPTE)
+ flush_hash_page(mm->context, vmaddr, pte);
+ }
+#ifdef CONFIG_SMP
+ smp_send_tlb_invalidate(0);
+#endif
+}
+
+
+/*
+ * For each address in the range, find the pte for the address
+ * and check _PAGE_HASHPTE bit; if it is set, find and destroy
+ * the corresponding HPTE.
+ */
+void
+local_flush_tlb_range(struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long pmd_end;
+ unsigned int ctx = mm->context;
+
+ if (Hash == 0) {
+ _tlbia();
+ return;
+ }
+ start &= PAGE_MASK;
+ if (start >= end)
+ return;
+ pmd = pmd_offset(pgd_offset(mm, start), start);
+ do {
+ pmd_end = (start + PGDIR_SIZE) & PGDIR_MASK;
+ if (!pmd_none(*pmd)) {
+ if (!pmd_end || pmd_end > end)
+ pmd_end = end;
+ pte = pte_offset(pmd, start);
+ do {
+ if ((pte_val(*pte) & _PAGE_HASHPTE) != 0)
+ flush_hash_page(ctx, start, pte);
+ start += PAGE_SIZE;
+ ++pte;
+ } while (start && start < pmd_end);
+ } else {
+ start = pmd_end;
+ }
+ ++pmd;
+ } while (start && start < end);
+
+#ifdef CONFIG_SMP
+ smp_send_tlb_invalidate(0);
+#endif
+}
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