copypage-fa.c 2.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * linux/arch/arm/lib/copypage-fa.S
  4. *
  5. * Copyright (C) 2005 Faraday Corp.
  6. * Copyright (C) 2008-2009 Paulius Zaleckas <[email protected]>
  7. *
  8. * Based on copypage-v4wb.S:
  9. * Copyright (C) 1995-1999 Russell King
  10. */
  11. #include <linux/init.h>
  12. #include <linux/highmem.h>
  13. /*
  14. * Faraday optimised copy_user_page
  15. */
  16. static void fa_copy_user_page(void *kto, const void *kfrom)
  17. {
  18. int tmp;
  19. asm volatile ("\
  20. 1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\
  21. stmia %0, {r3, r4, ip, lr} @ 4\n\
  22. mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
  23. add %0, %0, #16 @ 1\n\
  24. ldmia %1!, {r3, r4, ip, lr} @ 4\n\
  25. stmia %0, {r3, r4, ip, lr} @ 4\n\
  26. mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
  27. add %0, %0, #16 @ 1\n\
  28. subs %2, %2, #1 @ 1\n\
  29. bne 1b @ 1\n\
  30. mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB"
  31. : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
  32. : "2" (PAGE_SIZE / 32)
  33. : "r3", "r4", "ip", "lr");
  34. }
  35. void fa_copy_user_highpage(struct page *to, struct page *from,
  36. unsigned long vaddr, struct vm_area_struct *vma)
  37. {
  38. void *kto, *kfrom;
  39. kto = kmap_atomic(to);
  40. kfrom = kmap_atomic(from);
  41. fa_copy_user_page(kto, kfrom);
  42. kunmap_atomic(kfrom);
  43. kunmap_atomic(kto);
  44. }
  45. /*
  46. * Faraday optimised clear_user_page
  47. *
  48. * Same story as above.
  49. */
  50. void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
  51. {
  52. void *ptr, *kaddr = kmap_atomic(page);
  53. asm volatile("\
  54. mov r1, %2 @ 1\n\
  55. mov r2, #0 @ 1\n\
  56. mov r3, #0 @ 1\n\
  57. mov ip, #0 @ 1\n\
  58. mov lr, #0 @ 1\n\
  59. 1: stmia %0, {r2, r3, ip, lr} @ 4\n\
  60. mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
  61. add %0, %0, #16 @ 1\n\
  62. stmia %0, {r2, r3, ip, lr} @ 4\n\
  63. mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
  64. add %0, %0, #16 @ 1\n\
  65. subs r1, r1, #1 @ 1\n\
  66. bne 1b @ 1\n\
  67. mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB"
  68. : "=r" (ptr)
  69. : "0" (kaddr), "I" (PAGE_SIZE / 32)
  70. : "r1", "r2", "r3", "ip", "lr");
  71. kunmap_atomic(kaddr);
  72. }
  73. struct cpu_user_fns fa_user_fns __initdata = {
  74. .cpu_clear_user_highpage = fa_clear_user_highpage,
  75. .cpu_copy_user_highpage = fa_copy_user_highpage,
  76. };