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pg-r3k.c
资源名称：linux-2.4.20.tar.gz　[点击查看]
上传用户：jlfgdled
上传日期：2013-04-10
资源大小：33168k
文件大小：2k
源码类别：

Linux/Unix编程

开发平台：

Unix_Linux

pg-r3k.c：源码内容
  1. /*
  2.  * Copyright (C) 2001 Ralf Baechle (ralf@gnu.org)
  3.  */
  4. #include <linux/sched.h>
  5. #include <linux/mm.h>
  7. /* page functions */
  8. void r3k_clear_page(void * page)
  9. {
  10. __asm__ __volatile__(
  11. ".settnoreordernt"
  12. ".settnoatnt"
  13. "addiut$1,%0,%2n"
  14. "1:tswt$0,(%0)nt"
  15. "swt$0,4(%0)nt"
  16. "swt$0,8(%0)nt"
  17. "swt$0,12(%0)nt"
  18. "addiut%0,32nt"
  19. "swt$0,-16(%0)nt"
  20. "swt$0,-12(%0)nt"
  21. "swt$0,-8(%0)nt"
  22. "bnet$1,%0,1bnt"
  23. "swt$0,-4(%0)nt"
  24. ".settatnt"
  25. ".settreorder"
  26. : "=r" (page)
  27. : "0" (page), "I" (PAGE_SIZE)
  28. : "memory");
  29. }
  31. void r3k_copy_page(void * to, void * from)
  32. {
  33. unsigned long dummy1, dummy2;
  34. unsigned long reg1, reg2, reg3, reg4;
  36. __asm__ __volatile__(
  37. ".settnoreordernt"
  38. ".settnoatnt"
  39. "addiut$1,%0,%8n"
  40. "1:tlwt%2,(%1)nt"
  41. "lwt%3,4(%1)nt"
  42. "lwt%4,8(%1)nt"
  43. "lwt%5,12(%1)nt"
  44. "swt%2,(%0)nt"
  45. "swt%3,4(%0)nt"
  46. "swt%4,8(%0)nt"
  47. "swt%5,12(%0)nt"
  48. "lwt%2,16(%1)nt"
  49. "lwt%3,20(%1)nt"
  50. "lwt%4,24(%1)nt"
  51. "lwt%5,28(%1)nt"
  52. "swt%2,16(%0)nt"
  53. "swt%3,20(%0)nt"
  54. "swt%4,24(%0)nt"
  55. "swt%5,28(%0)nt"
  56. "addiut%0,64nt"
  57. "addiut%1,64nt"
  58. "lwt%2,-32(%1)nt"
  59. "lwt%3,-28(%1)nt"
  60. "lwt%4,-24(%1)nt"
  61. "lwt%5,-20(%1)nt"
  62. "swt%2,-32(%0)nt"
  63. "swt%3,-28(%0)nt"
  64. "swt%4,-24(%0)nt"
  65. "swt%5,-20(%0)nt"
  66. "lwt%2,-16(%1)nt"
  67. "lwt%3,-12(%1)nt"
  68. "lwt%4,-8(%1)nt"
  69. "lwt%5,-4(%1)nt"
  70. "swt%2,-16(%0)nt"
  71. "swt%3,-12(%0)nt"
  72. "swt%4,-8(%0)nt"
  73. "bnet$1,%0,1bnt"
  74. "swt%5,-4(%0)nt"
  75. ".settatnt"
  76. ".settreorder"
  77. : "=r" (dummy1), "=r" (dummy2),
  78.   "=&r" (reg1), "=&r" (reg2), "=&r" (reg3), "=&r" (reg4)
  79. : "0" (to), "1" (from),
  80.   "I" (PAGE_SIZE));
  81. }
  83. /*
  84.  * Initialize new page directory with pointers to invalid ptes
  85.  */
  86. void pgd_init(unsigned long page)
  87. {
  88. unsigned long dummy1, dummy2;
  90. /*
  91.  * The plain and boring version for the R3000.  No cache flushing
  92.  * stuff is implemented since the R3000 has physical caches.
  93.  */
  94. __asm__ __volatile__(
  95. ".settnoreordern"
  96. "1:tswt%2, (%0)nt"
  97. "swt%2, 4(%0)nt"
  98. "swt%2, 8(%0)nt"
  99. "swt%2, 12(%0)nt"
  100. "swt%2, 16(%0)nt"
  101. "swt%2, 20(%0)nt"
  102. "swt%2, 24(%0)nt"
  103. "swt%2, 28(%0)nt"
  104. "subut%1, 1nt"
  105. "bnezt%1, 1bnt"
  106. "addiut%0, 32nt"
  107. ".settreorder"
  108. :"=r" (dummy1), "=r" (dummy2)
  109. :"r" ((unsigned long) invalid_pte_table), "0" (page),
  110.  "1" (USER_PTRS_PER_PGD / 8));
  111. }