Viewing file:  paccess.h (2.4 KB) -rw-r--r--
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*
* Protected memory access. Used for everything that might take revenge
* by sending a DBE error like accessing possibly non-existant memory or
* devices.
*/
#ifndef _ASM_PACCESS_H
#define _ASM_PACCESS_H
#include <linux/errno.h>
#define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr)))
#define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr)))
struct __large_pstruct { unsigned long buf[100]; };
#define __mp(x) (*(struct __large_pstruct *)(x))
#define __get_dbe(x,ptr,size) ({ \
long __gu_err; \
__typeof(*(ptr)) __gu_val; \
long __gu_addr; \
__asm__("":"=r" (__gu_val)); \
__gu_addr = (long) (ptr); \
__asm__("":"=r" (__gu_err)); \
switch (size) { \
case 1: __get_dbe_asm("lb"); break; \
case 2: __get_dbe_asm("lh"); break; \
case 4: __get_dbe_asm("lw"); break; \
case 8: __get_dbe_asm("ld"); break; \
default: __get_dbe_unknown(); break; \
} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
#define __get_dbe_asm(insn) \
({ \
__asm__ __volatile__( \
"1:\t" insn "\t%1,%2\n\t" \
"move\t%0,$0\n" \
"2:\n\t" \
".section\t.fixup,\"ax\"\n" \
"3:\tli\t%0,%3\n\t" \
"move\t%1,$0\n\t" \
"j\t2b\n\t" \
".previous\n\t" \
".section\t__dbe_table,\"a\"\n\t" \
".dword\t1b,3b\n\t" \
".previous" \
:"=r" (__gu_err), "=r" (__gu_val) \
:"o" (__mp(__gu_addr)), "i" (-EFAULT)); })
extern void __get_dbe_unknown(void);
#define __put_dbe(x,ptr,size) ({ \
long __pu_err; \
__typeof__(*(ptr)) __pu_val; \
long __pu_addr; \
__pu_val = (x); \
__pu_addr = (long) (ptr); \
__asm__("":"=r" (__pu_err)); \
switch (size) { \
case 1: __put_dbe_asm("sb"); break; \
case 2: __put_dbe_asm("sh"); break; \
case 4: __put_dbe_asm("sw"); break; \
case 8: __put_dbe_asm("sd"); break; \
default: __put_dbe_unknown(); break; \
} __pu_err; })
#define __put_dbe_asm(insn) \
({ \
__asm__ __volatile__( \
"1:\t" insn "\t%1,%2\n\t" \
"move\t%0,$0\n" \
"2:\n\t" \
".section\t.fixup,\"ax\"\n" \
"3:\tli\t%0,%3\n\t" \
"j\t2b\n\t" \
".previous\n\t" \
".section\t__dbe_table,\"a\"\n\t" \
".dword\t1b,3b\n\t" \
".previous" \
:"=r" (__pu_err) \
:"r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); })
extern void __put_dbe_unknown(void);
#endif /* _ASM_PACCESS_H */
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