Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus
[linux-2.6.git] / arch / mips / include / asm / paccess.h
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-existent memory or
11  * devices.
12  */
13 #ifndef _ASM_PACCESS_H
14 #define _ASM_PACCESS_H
15
16 #include <linux/errno.h>
17
18 #ifdef CONFIG_32BIT
19 #define __PA_ADDR       ".word"
20 #endif
21 #ifdef CONFIG_64BIT
22 #define __PA_ADDR       ".dword"
23 #endif
24
25 extern asmlinkage void handle_ibe(void);
26 extern asmlinkage void handle_dbe(void);
27
28 #define put_dbe(x, ptr) __put_dbe((x), (ptr), sizeof(*(ptr)))
29 #define get_dbe(x, ptr) __get_dbe((x), (ptr), sizeof(*(ptr)))
30
31 struct __large_pstruct { unsigned long buf[100]; };
32 #define __mp(x) (*(struct __large_pstruct *)(x))
33
34 #define __get_dbe(x, ptr, size)                                         \
35 ({                                                                      \
36         long __gu_err;                                                  \
37         __typeof__(*(ptr)) __gu_val;                                    \
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)                                             \
54 {                                                                       \
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));                         \
69 }
70
71 extern void __get_dbe_unknown(void);
72
73 #define __put_dbe(x, ptr, size)                                         \
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)                                             \
92 {                                                                       \
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));        \
106 }
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 */