LXR linux/arch/mips/include/asm/paccess.h

   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-existent 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
  25extern asmlinkage void handle_ibe(void);
  26extern 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
  31struct __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
  71extern 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
 108extern void __put_dbe_unknown(void);
 109
 110extern unsigned long search_dbe_table(unsigned long addr);
 111
 112#endif /* _ASM_PACCESS_H */
 113