diff options
Diffstat (limited to 'include/asm-mips/paccess.h')
| -rw-r--r-- | include/asm-mips/paccess.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/include/asm-mips/paccess.h b/include/asm-mips/paccess.h new file mode 100644 index 000000000000..36cec9e31696 --- /dev/null +++ b/include/asm-mips/paccess.h | |||
| @@ -0,0 +1,113 @@ | |||
| 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/config.h> | ||
| 17 | #include <linux/errno.h> | ||
| 18 | |||
| 19 | #ifdef CONFIG_MIPS32 | ||
| 20 | #define __PA_ADDR ".word" | ||
| 21 | #endif | ||
| 22 | #ifdef CONFIG_MIPS64 | ||
| 23 | #define __PA_ADDR ".dword" | ||
| 24 | #endif | ||
| 25 | |||
| 26 | extern asmlinkage void handle_ibe(void); | ||
| 27 | extern asmlinkage void handle_dbe(void); | ||
| 28 | |||
| 29 | #define put_dbe(x,ptr) __put_dbe((x),(ptr),sizeof(*(ptr))) | ||
| 30 | #define get_dbe(x,ptr) __get_dbe((x),(ptr),sizeof(*(ptr))) | ||
| 31 | |||
| 32 | struct __large_pstruct { unsigned long buf[100]; }; | ||
| 33 | #define __mp(x) (*(struct __large_pstruct *)(x)) | ||
| 34 | |||
| 35 | #define __get_dbe(x,ptr,size) \ | ||
| 36 | ({ \ | ||
| 37 | long __gu_err; \ | ||
| 38 | __typeof(*(ptr)) __gu_val; \ | ||
| 39 | unsigned long __gu_addr; \ | ||
| 40 | __asm__("":"=r" (__gu_val)); \ | ||
| 41 | __gu_addr = (unsigned long) (ptr); \ | ||
| 42 | __asm__("":"=r" (__gu_err)); \ | ||
| 43 | switch (size) { \ | ||
| 44 | case 1: __get_dbe_asm("lb"); break; \ | ||
| 45 | case 2: __get_dbe_asm("lh"); break; \ | ||
| 46 | case 4: __get_dbe_asm("lw"); break; \ | ||
| 47 | case 8: __get_dbe_asm("ld"); break; \ | ||
| 48 | default: __get_dbe_unknown(); break; \ | ||
| 49 | } \ | ||
| 50 | x = (__typeof__(*(ptr))) __gu_val; \ | ||
| 51 | __gu_err; \ | ||
| 52 | }) | ||
| 53 | |||
| 54 | #define __get_dbe_asm(insn) \ | ||
| 55 | ({ \ | ||
| 56 | __asm__ __volatile__( \ | ||
| 57 | "1:\t" insn "\t%1,%2\n\t" \ | ||
| 58 | "move\t%0,$0\n" \ | ||
| 59 | "2:\n\t" \ | ||
| 60 | ".section\t.fixup,\"ax\"\n" \ | ||
| 61 | "3:\tli\t%0,%3\n\t" \ | ||
| 62 | "move\t%1,$0\n\t" \ | ||
| 63 | "j\t2b\n\t" \ | ||
| 64 | ".previous\n\t" \ | ||
| 65 | ".section\t__dbe_table,\"a\"\n\t" \ | ||
| 66 | __PA_ADDR "\t1b, 3b\n\t" \ | ||
| 67 | ".previous" \ | ||
| 68 | :"=r" (__gu_err), "=r" (__gu_val) \ | ||
| 69 | :"o" (__mp(__gu_addr)), "i" (-EFAULT)); \ | ||
| 70 | }) | ||
| 71 | |||
| 72 | extern void __get_dbe_unknown(void); | ||
| 73 | |||
| 74 | #define __put_dbe(x,ptr,size) \ | ||
| 75 | ({ \ | ||
| 76 | long __pu_err; \ | ||
| 77 | __typeof__(*(ptr)) __pu_val; \ | ||
| 78 | long __pu_addr; \ | ||
| 79 | __pu_val = (x); \ | ||
| 80 | __pu_addr = (long) (ptr); \ | ||
| 81 | __asm__("":"=r" (__pu_err)); \ | ||
| 82 | switch (size) { \ | ||
| 83 | case 1: __put_dbe_asm("sb"); break; \ | ||
| 84 | case 2: __put_dbe_asm("sh"); break; \ | ||
| 85 | case 4: __put_dbe_asm("sw"); break; \ | ||
| 86 | case 8: __put_dbe_asm("sd"); break; \ | ||
| 87 | default: __put_dbe_unknown(); break; \ | ||
| 88 | } \ | ||
| 89 | __pu_err; \ | ||
| 90 | }) | ||
| 91 | |||
| 92 | #define __put_dbe_asm(insn) \ | ||
| 93 | ({ \ | ||
| 94 | __asm__ __volatile__( \ | ||
| 95 | "1:\t" insn "\t%1,%2\n\t" \ | ||
| 96 | "move\t%0,$0\n" \ | ||
| 97 | "2:\n\t" \ | ||
| 98 | ".section\t.fixup,\"ax\"\n" \ | ||
| 99 | "3:\tli\t%0,%3\n\t" \ | ||
| 100 | "j\t2b\n\t" \ | ||
| 101 | ".previous\n\t" \ | ||
| 102 | ".section\t__dbe_table,\"a\"\n\t" \ | ||
| 103 | __PA_ADDR "\t1b, 3b\n\t" \ | ||
| 104 | ".previous" \ | ||
| 105 | : "=r" (__pu_err) \ | ||
| 106 | : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \ | ||
| 107 | }) | ||
| 108 | |||
| 109 | extern void __put_dbe_unknown(void); | ||
| 110 | |||
| 111 | extern unsigned long search_dbe_table(unsigned long addr); | ||
| 112 | |||
| 113 | #endif /* _ASM_PACCESS_H */ | ||