arch/arm/mm/tlb-v6.S

   1 /*
   2  *  linux/arch/arm/mm/tlb-v6.S
   3  *
   4  *  Copyright (C) 1997-2002 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  ARM architecture version 6 TLB handling functions.
  11  *  These assume a split I/D TLB.
  12  */
  13 #include <linux/linkage.h>
  14 #include <asm/constants.h>
  15 #include <asm/page.h>
  16 #include <asm/tlbflush.h>
  17 #include "proc-macros.S"
  18
  19 #define HARVARD_TLB
  20
  21 /*
  22  *      v6wbi_flush_user_tlb_range(start, end, vma)
  23  *
  24  *      Invalidate a range of TLB entries in the specified address space.
  25  *
  26  *      - start - start address (may not be aligned)
  27  *      - end   - end address (exclusive, may not be aligned)
  28  *      - vma   - vma_struct describing address range
  29  *
  30  *      It is assumed that:
  31  *      - the "Invalidate single entry" instruction will invalidate
  32  *        both the I and the D TLBs on Harvard-style TLBs
  33  */
  34 ENTRY(v6wbi_flush_user_tlb_range)
  35         vma_vm_mm r3, r2                        @ get vma->vm_mm
  36         mov     ip, #0
  37         mmid    r3, r3                          @ get vm_mm->context.id
  38         mcr     p15, 0, ip, c7, c10, 4          @ drain write buffer
  39         mov     r0, r0, lsr #PAGE_SHIFT         @ align address
  40         mov     r1, r1, lsr #PAGE_SHIFT
  41         asid    r3, r3                          @ mask ASID
  42         orr     r0, r3, r0, lsl #PAGE_SHIFT     @ Create initial MVA
  43         mov     r1, r1, lsl #PAGE_SHIFT
  44         vma_vm_flags r2, r2                     @ get vma->vm_flags
  45 1:
  46 #ifdef HARVARD_TLB
  47         mcr     p15, 0, r0, c8, c6, 1           @ TLB invalidate D MVA (was 1)
  48         tst     r2, #VM_EXEC                    @ Executable area ?
  49         mcrne   p15, 0, r0, c8, c5, 1           @ TLB invalidate I MVA (was 1)
  50 #else
  51         mcr     p15, 0, r0, c8, c7, 1           @ TLB invalidate MVA (was 1)
  52 #endif
  53         add     r0, r0, #PAGE_SZ
  54         cmp     r0, r1
  55         blo     1b
  56         mov     pc, lr
  57
  58 /*
  59  *      v6wbi_flush_kern_tlb_range(start,end)
  60  *
  61  *      Invalidate a range of kernel TLB entries
  62  *
  63  *      - start - start address (may not be aligned)
  64  *      - end   - end address (exclusive, may not be aligned)
  65  */
  66 ENTRY(v6wbi_flush_kern_tlb_range)
  67         mov     r2, #0
  68         mcr     p15, 0, r2, c7, c10, 4          @ drain write buffer
  69         mov     r0, r0, lsr #PAGE_SHIFT         @ align address
  70         mov     r1, r1, lsr #PAGE_SHIFT
  71         mov     r0, r0, lsl #PAGE_SHIFT
  72         mov     r1, r1, lsl #PAGE_SHIFT
  73 1:
  74 #ifdef HARVARD_TLB
  75         mcr     p15, 0, r0, c8, c6, 1           @ TLB invalidate D MVA
  76         mcr     p15, 0, r0, c8, c5, 1           @ TLB invalidate I MVA
  77 #else
  78         mcr     p15, 0, r0, c8, c7, 1           @ TLB invalidate MVA
  79 #endif
  80         add     r0, r0, #PAGE_SZ
  81         cmp     r0, r1
  82         blo     1b
  83         mov     pc, lr
  84
  85         .section ".text.init", #alloc, #execinstr
  86
  87         .type   v6wbi_tlb_fns, #object
  88 ENTRY(v6wbi_tlb_fns)
  89         .long   v6wbi_flush_user_tlb_range
  90         .long   v6wbi_flush_kern_tlb_range
  91         .long   v6wbi_tlb_flags
  92         .size   v6wbi_tlb_fns, . - v6wbi_tlb_fns