tlb-v4wbi.S 1.7 KB

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  1. /*
  2. * linux/arch/arm/mm/tlbv4wbi.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 and version 5 TLB handling functions.
  11. * These assume a split I/D TLBs, with a write buffer.
  12. *
  13. * Processors: ARM920 ARM922 ARM925 ARM926 XScale
  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. * v4wb_flush_user_tlb_range(start, end, mm)
  22. *
  23. * Invalidate a range of TLB entries in the specified address space.
  24. *
  25. * - start - range start address
  26. * - end - range end address
  27. * - mm - mm_struct describing address space
  28. */
  29. .align 5
  30. ENTRY(v4wbi_flush_user_tlb_range)
  31. vma_vm_mm ip, r2
  32. act_mm r3 @ get current->active_mm
  33. eors r3, ip, r3 @ == mm ?
  34. movne pc, lr @ no, we dont do anything
  35. mov r3, #0
  36. mcr p15, 0, r3, c7, c10, 4 @ drain WB
  37. vma_vm_flags r2, r2
  38. bic r0, r0, #0x0ff
  39. bic r0, r0, #0xf00
  40. 1: tst r2, #VM_EXEC
  41. mcrne p15, 0, r0, c8, c5, 1 @ invalidate I TLB entry
  42. mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry
  43. add r0, r0, #PAGE_SZ
  44. cmp r0, r1
  45. blo 1b
  46. mov pc, lr
  47. ENTRY(v4wbi_flush_kern_tlb_range)
  48. mov r3, #0
  49. mcr p15, 0, r3, c7, c10, 4 @ drain WB
  50. bic r0, r0, #0x0ff
  51. bic r0, r0, #0xf00
  52. 1: mcr p15, 0, r0, c8, c5, 1 @ invalidate I TLB entry
  53. mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry
  54. add r0, r0, #PAGE_SZ
  55. cmp r0, r1
  56. blo 1b
  57. mov pc, lr
  58. __INITDATA
  59. .type v4wbi_tlb_fns, #object
  60. ENTRY(v4wbi_tlb_fns)
  61. .long v4wbi_flush_user_tlb_range
  62. .long v4wbi_flush_kern_tlb_range
  63. .long v4wbi_tlb_flags
  64. .size v4wbi_tlb_fns, . - v4wbi_tlb_fns