arch/arm/mm/tlb-v4.S

   1 /*
   2  *  linux/arch/arm/mm/tlbv4.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 4 TLB handling functions.
  11  *  These assume a split I/D TLBs, and no write buffer.
  12  *
  13  * Processors: ARM720T
  14  */
  15 #include <linux/linkage.h>
  16 #include <linux/init.h>
  17 #include <asm/asm-offsets.h>
  18 #include <asm/tlbflush.h>
  19 #include "proc-macros.S"
  20
  21         .align  5
  22 /*
  23  *      v4_flush_user_tlb_range(start, end, mm)
  24  *
  25  *      Invalidate a range of TLB entries in the specified user address space.
  26  *
  27  *      - start - range start address
  28  *      - end   - range end address
  29  *      - mm    - mm_struct describing address space
  30  */
  31         .align  5
  32 ENTRY(v4_flush_user_tlb_range)
  33         vma_vm_mm ip, r2
  34         act_mm  r3                              @ get current->active_mm
  35         eors    r3, ip, r3                              @ == mm ?
  36         movne   pc, lr                          @ no, we dont do anything
  37 .v4_flush_kern_tlb_range:
  38         bic     r0, r0, #0x0ff
  39         bic     r0, r0, #0xf00
  40 1:      mcr     p15, 0, r0, c8, c7, 1           @ invalidate TLB entry
  41         add     r0, r0, #PAGE_SZ
  42         cmp     r0, r1
  43         blo     1b
  44         mov     pc, lr
  45
  46 /*
  47  *      v4_flush_kern_tlb_range(start, end)
  48  *
  49  *      Invalidate a range of TLB entries in the specified kernel
  50  *      address range.
  51  *
  52  *      - start - virtual address (may not be aligned)
  53  *      - end   - virtual address (may not be aligned)
  54  */
  55 .globl v4_flush_kern_tlb_range
  56 .equ v4_flush_kern_tlb_range, .v4_flush_kern_tlb_range
  57
  58         __INITDATA
  59
  60         /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */
  61         define_tlb_functions v4, v4_tlb_flags