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 ".insn\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 ".insn\n\t" \
99 ".section\t.fixup,\"ax\"\n" \
100 "3:\tli\t%0,%3\n\t" \
101 "j\t2b\n\t" \
102 ".previous\n\t" \
103 ".section\t__dbe_table,\"a\"\n\t" \
104 __PA_ADDR "\t1b, 3b\n\t" \
105 ".previous" \
106 : "=r" (__pu_err) \
107 : "r" (__pu_val), "o" (__mp(__pu_addr)), "i" (-EFAULT)); \
108 }
109
110 extern void __put_dbe_unknown(void);
111
112 extern unsigned long search_dbe_table(unsigned long addr);
113
114 #endif /* _ASM_PACCESS_H */