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C/C++ Source or Header  |  2006-08-11  |  3.0 KB  |  113 lines
  1. /*
  2.  * This file is subject to the terms and conditions of the GNU General Public
  3.  * License.  See the file "COPYING" in the main directory of this archive
  4.  * for more details.
  5.  *
  6.  * Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
  7.  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  8.  *
  9.  * Protected memory access.  Used for everything that might take revenge
  10.  * by sending a DBE error like accessing possibly non-existant memory or
  11.  * devices.
  12.  */
  13. #ifndef _ASM_PACCESS_H
  14. #define _ASM_PACCESS_H
  15.  
  16. #include <linux/errno.h>
  17.  
  18. #ifdef CONFIG_32BIT
  19. #define __PA_ADDR    ".word"
  20. #endif
  21. #ifdef CONFIG_64BIT
  22. #define __PA_ADDR    ".dword"
  23. #endif
  24.  
  25. extern asmlinkage void handle_ibe(void);
  26. extern asmlinkage void handle_dbe(void);
  27.  
  28. #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr)))
  29. #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr)))
  30.  
  31. struct __large_pstruct { unsigned long buf[100]; };
  32. #define __mp(x) (*(struct __large_pstruct *)(x))
  33.  
  34. #define __get_dbe(x,ptr,size)                        \
  35. ({                                    \
  36.     long __gu_err;                            \
  37.     __typeof(*(ptr)) __gu_val;                    \
  38.     unsigned long __gu_addr;                    \
  39.     __asm__("":"=r" (__gu_val));                    \
  40.     __gu_addr = (unsigned long) (ptr);                \
  41.     __asm__("":"=r" (__gu_err));                    \
  42.     switch (size) {                            \
  43.     case 1: __get_dbe_asm("lb"); break;                \
  44.     case 2: __get_dbe_asm("lh"); break;                \
  45.     case 4: __get_dbe_asm("lw"); break;                \
  46.     case 8:  __get_dbe_asm("ld"); break;                \
  47.     default: __get_dbe_unknown(); break;                \
  48.     }                                \
  49.     x = (__typeof__(*(ptr))) __gu_val;                \
  50.     __gu_err;                            \
  51. })
  52.  
  53. #define __get_dbe_asm(insn)                        \
  54. {                                    \
  55.     __asm__ __volatile__(                        \
  56.     "1:\t" insn "\t%1,%2\n\t"                    \
  57.     "move\t%0,$0\n"                            \
  58.     "2:\n\t"                            \
  59.     ".section\t.fixup,\"ax\"\n"                    \
  60.     "3:\tli\t%0,%3\n\t"                        \
  61.     "move\t%1,$0\n\t"                        \
  62.     "j\t2b\n\t"                            \
  63.     ".previous\n\t"                            \
  64.     ".section\t__dbe_table,\"a\"\n\t"                \
  65.     __PA_ADDR "\t1b, 3b\n\t"                    \
  66.     ".previous"                            \
  67.     :"=r" (__gu_err), "=r" (__gu_val)                \
  68.     :"o" (__mp(__gu_addr)), "i" (-EFAULT));                \
  69. }
  70.  
  71. extern void __get_dbe_unknown(void);
  72.  
  73. #define __put_dbe(x,ptr,size)                        \
  74. ({                                    \
  75.     long __pu_err;                            \
  76.     __typeof__(*(ptr)) __pu_val;                    \
  77.     long __pu_addr;                            \
  78.     __pu_val = (x);                            \
  79.     __pu_addr = (long) (ptr);                    \
  80.     __asm__("":"=r" (__pu_err));                    \
  81.     switch (size) {                            \
  82.     case 1: __put_dbe_asm("sb"); break;                \
  83.     case 2: __put_dbe_asm("sh"); break;                \
  84.     case 4: __put_dbe_asm("sw"); break;                \
  85.     case 8: __put_dbe_asm("sd"); break;                \
  86.     default: __put_dbe_unknown(); break;                \
  87.     }                                \
  88.     __pu_err;                            \
  89. })
  90.  
  91. #define __put_dbe_asm(insn)                        \
  92. {                                    \
  93.     __asm__ __volatile__(                        \
  94.     "1:\t" insn "\t%1,%2\n\t"                    \
  95.     "move\t%0,$0\n"                            \
  96.     "2:\n\t"                            \
  97.     ".section\t.fixup,\"ax\"\n"                    \
  98.     "3:\tli\t%0,%3\n\t"                        \
  99.     "j\t2b\n\t"                            \
  100.     ".previous\n\t"                            \
  101.     ".section\t__dbe_table,\"a\"\n\t"                \
  102.     __PA_ADDR "\t1b, 3b\n\t"                    \
  103.     ".previous"                            \
  104.     : "=r" (__pu_err)                        \
  105.     : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT));    \
  106. }
  107.  
  108. extern void __put_dbe_unknown(void);
  109.  
  110. extern unsigned long search_dbe_table(unsigned long addr);
  111.  
  112. #endif /* _ASM_PACCESS_H */
  113.