Commit | Line | Data |
---|---|---|
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 | ||
16 | #include <linux/config.h> | |
17 | #include <linux/errno.h> | |
18 | ||
875d43e7 | 19 | #ifdef CONFIG_32BIT |
1da177e4 LT |
20 | #define __PA_ADDR ".word" |
21 | #endif | |
875d43e7 | 22 | #ifdef CONFIG_64BIT |
1da177e4 LT |
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) \ | |
77c728c2 | 55 | { \ |
1da177e4 LT |
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)); \ | |
77c728c2 | 70 | } |
1da177e4 LT |
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) \ | |
77c728c2 | 93 | { \ |
1da177e4 LT |
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)); \ | |
77c728c2 | 107 | } |
1da177e4 LT |
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 */ |