mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 05:02:12 +00:00
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
|
|
* 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/config.h>
|
|
#include <linux/errno.h>
|
|
|
|
#ifdef CONFIG_32BIT
|
|
#define __PA_ADDR ".word"
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
#define __PA_ADDR ".dword"
|
|
#endif
|
|
|
|
extern asmlinkage void handle_ibe(void);
|
|
extern asmlinkage void handle_dbe(void);
|
|
|
|
#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; \
|
|
unsigned long __gu_addr; \
|
|
__asm__("":"=r" (__gu_val)); \
|
|
__gu_addr = (unsigned 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" \
|
|
__PA_ADDR "\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" \
|
|
__PA_ADDR "\t1b, 3b\n\t" \
|
|
".previous" \
|
|
: "=r" (__pu_err) \
|
|
: "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \
|
|
}
|
|
|
|
extern void __put_dbe_unknown(void);
|
|
|
|
extern unsigned long search_dbe_table(unsigned long addr);
|
|
|
|
#endif /* _ASM_PACCESS_H */
|