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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mm/tlb-v6.S
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/mm/tlb-v6.S')
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diff --git a/arch/arm/mm/tlb-v6.S b/arch/arm/mm/tlb-v6.S
new file mode 100644
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+++ b/arch/arm/mm/tlb-v6.S
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+/*
+ * linux/arch/arm/mm/tlb-v6.S
+ *
+ * Copyright (C) 1997-2002 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * ARM architecture version 6 TLB handling functions.
+ * These assume a split I/D TLB.
+ */
+#include <linux/linkage.h>
+#include <asm/constants.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+#include "proc-macros.S"
+
+#define HARVARD_TLB
+
+/*
+ * v6wbi_flush_user_tlb_range(start, end, vma)
+ *
+ * Invalidate a range of TLB entries in the specified address space.
+ *
+ * - start - start address (may not be aligned)
+ * - end - end address (exclusive, may not be aligned)
+ * - vma - vma_struct describing address range
+ *
+ * It is assumed that:
+ * - the "Invalidate single entry" instruction will invalidate
+ * both the I and the D TLBs on Harvard-style TLBs
+ */
+ENTRY(v6wbi_flush_user_tlb_range)
+ vma_vm_mm r3, r2 @ get vma->vm_mm
+ mov ip, #0
+ mmid r3, r3 @ get vm_mm->context.id
+ mcr p15, 0, ip, c7, c10, 4 @ drain write buffer
+ mov r0, r0, lsr #PAGE_SHIFT @ align address
+ mov r1, r1, lsr #PAGE_SHIFT
+ asid r3, r3 @ mask ASID
+ orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA
+ mov r1, r1, lsl #PAGE_SHIFT
+ vma_vm_flags r2, r2 @ get vma->vm_flags
+1:
+#ifdef HARVARD_TLB
+ mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA (was 1)
+ tst r2, #VM_EXEC @ Executable area ?
+ mcrne p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA (was 1)
+#else
+ mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA (was 1)
+#endif
+ add r0, r0, #PAGE_SZ
+ cmp r0, r1
+ blo 1b
+ mov pc, lr
+
+/*
+ * v6wbi_flush_kern_tlb_range(start,end)
+ *
+ * Invalidate a range of kernel TLB entries
+ *
+ * - start - start address (may not be aligned)
+ * - end - end address (exclusive, may not be aligned)
+ */
+ENTRY(v6wbi_flush_kern_tlb_range)
+ mov r2, #0
+ mcr p15, 0, r2, c7, c10, 4 @ drain write buffer
+ mov r0, r0, lsr #PAGE_SHIFT @ align address
+ mov r1, r1, lsr #PAGE_SHIFT
+ mov r0, r0, lsl #PAGE_SHIFT
+ mov r1, r1, lsl #PAGE_SHIFT
+1:
+#ifdef HARVARD_TLB
+ mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA
+ mcr p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA
+#else
+ mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA
+#endif
+ add r0, r0, #PAGE_SZ
+ cmp r0, r1
+ blo 1b
+ mov pc, lr
+
+ .section ".text.init", #alloc, #execinstr
+
+ .type v6wbi_tlb_fns, #object
+ENTRY(v6wbi_tlb_fns)
+ .long v6wbi_flush_user_tlb_range
+ .long v6wbi_flush_kern_tlb_range
+ .long v6wbi_tlb_flags
+ .size v6wbi_tlb_fns, . - v6wbi_tlb_fns