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
25extern asmlinkage void handle_ibe(void);
26extern 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
31struct __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
72extern 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
110extern void __put_dbe_unknown(void);
111
112extern unsigned long search_dbe_table(unsigned long addr);
113
114#endif /* _ASM_PACCESS_H */
115