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1da177e4 LT |
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 | ||
1da177e4 LT |
16 | #include <linux/errno.h> |
17 | ||
875d43e7 | 18 | #ifdef CONFIG_32BIT |
1da177e4 LT |
19 | #define __PA_ADDR ".word" |
20 | #endif | |
875d43e7 | 21 | #ifdef CONFIG_64BIT |
1da177e4 LT |
22 | #define __PA_ADDR ".dword" |
23 | #endif | |
24 | ||
25 | extern asmlinkage void handle_ibe(void); | |
26 | extern asmlinkage void handle_dbe(void); | |
27 | ||
21a151d8 RB |
28 | #define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr))) |
29 | #define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr))) | |
1da177e4 LT |
30 | |
31 | struct __large_pstruct { unsigned long buf[100]; }; | |
32 | #define __mp(x) (*(struct __large_pstruct *)(x)) | |
33 | ||
21a151d8 | 34 | #define __get_dbe(x, ptr, size) \ |
1da177e4 LT |
35 | ({ \ |
36 | long __gu_err; \ | |
a4c9bb7d | 37 | __typeof__(*(ptr)) __gu_val; \ |
1da177e4 LT |
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) \ | |
77c728c2 | 54 | { \ |
1da177e4 LT |
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)); \ | |
77c728c2 | 69 | } |
1da177e4 LT |
70 | |
71 | extern void __get_dbe_unknown(void); | |
72 | ||
21a151d8 | 73 | #define __put_dbe(x, ptr, size) \ |
1da177e4 LT |
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) \ | |
77c728c2 | 92 | { \ |
1da177e4 LT |
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)); \ | |
77c728c2 | 106 | } |
1da177e4 LT |
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 */ |