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   1 /*
   2  *  linux/arch/arm/mm/tlb-v7.S
   3  *
   4  *  Copyright (C) 1997-2002 Russell King
   5  *  Modified for ARMv7 by Catalin Marinas
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  *  ARM architecture version 6 TLB handling functions.
  12  *  These assume a split I/D TLB.
  13  */
  14 #include <linux/init.h>
  15 #include <linux/linkage.h>
  16 #include <asm/asm-offsets.h>
  17 #include <asm/page.h>
  18 #include <asm/tlbflush.h>
  19 #include "proc-macros.S"
  20
  21 /*
  22  *      v7wbi_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(v7wbi_flush_user_tlb_range)
  35         vma_vm_mm r3, r2                        @ get vma->vm_mm
  36         mmid    r3, r3                          @ get vm_mm->context.id
  37         dsb
  38         mov     r0, r0, lsr #PAGE_SHIFT         @ align address
  39         mov     r1, r1, lsr #PAGE_SHIFT
  40         asid    r3, r3                          @ mask ASID
  41         orr     r0, r3, r0, lsl #PAGE_SHIFT     @ Create initial MVA
  42         mov     r1, r1, lsl #PAGE_SHIFT
  43         vma_vm_flags r2, r2                     @ get vma->vm_flags
  44 1:
  45 #ifdef CONFIG_SMP
  46         mcr     p15, 0, r0, c8, c3, 1           @ TLB invalidate U MVA (shareable)
  47 #else
  48         mcr     p15, 0, r0, c8, c7, 1           @ TLB invalidate U MVA
  49 #endif
  50         add     r0, r0, #PAGE_SZ
  51         cmp     r0, r1
  52         blo     1b
  53         mov     ip, #0
  54         mcr     p15, 0, ip, c7, c5, 6           @ flush BTAC/BTB
  55         dsb
  56         mov     pc, lr
  57 ENDPROC(v7wbi_flush_user_tlb_range)
  58
  59 /*
  60  *      v7wbi_flush_kern_tlb_range(start,end)
  61  *
  62  *      Invalidate a range of kernel TLB entries
  63  *
  64  *      - start - start address (may not be aligned)
  65  *      - end   - end address (exclusive, may not be aligned)
  66  */
  67 ENTRY(v7wbi_flush_kern_tlb_range)
  68         dsb
  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 CONFIG_SMP
  75         mcr     p15, 0, r0, c8, c3, 1           @ TLB invalidate U MVA (shareable)
  76 #else
  77         mcr     p15, 0, r0, c8, c7, 1           @ TLB invalidate U MVA
  78 #endif
  79         add     r0, r0, #PAGE_SZ
  80         cmp     r0, r1
  81         blo     1b
  82         mov     r2, #0
  83         mcr     p15, 0, r2, c7, c5, 6           @ flush BTAC/BTB
  84         dsb
  85         isb
  86         mov     pc, lr
  87 ENDPROC(v7wbi_flush_kern_tlb_range)
  88
  89         __INIT
  90
  91         .type   v7wbi_tlb_fns, #object
  92 ENTRY(v7wbi_tlb_fns)
  93         .long   v7wbi_flush_user_tlb_range
  94         .long   v7wbi_flush_kern_tlb_range
  95         .long   v7wbi_tlb_flags
  96         .size   v7wbi_tlb_fns, . - v7wbi_tlb_fns