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-rw-r--r--arch/x86/include/asm/io_32.h196
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diff --git a/arch/x86/include/asm/io_32.h b/arch/x86/include/asm/io_32.h
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1#ifndef _ASM_X86_IO_32_H
2#define _ASM_X86_IO_32_H
3
4#include <linux/string.h>
5#include <linux/compiler.h>
6
7/*
8 * This file contains the definitions for the x86 IO instructions
9 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
10 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
11 * versions of the single-IO instructions (inb_p/inw_p/..).
12 *
13 * This file is not meant to be obfuscating: it's just complicated
14 * to (a) handle it all in a way that makes gcc able to optimize it
15 * as well as possible and (b) trying to avoid writing the same thing
16 * over and over again with slight variations and possibly making a
17 * mistake somewhere.
18 */
19
20/*
21 * Thanks to James van Artsdalen for a better timing-fix than
22 * the two short jumps: using outb's to a nonexistent port seems
23 * to guarantee better timings even on fast machines.
24 *
25 * On the other hand, I'd like to be sure of a non-existent port:
26 * I feel a bit unsafe about using 0x80 (should be safe, though)
27 *
28 * Linus
29 */
30
31 /*
32 * Bit simplified and optimized by Jan Hubicka
33 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
34 *
35 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
36 * isa_read[wl] and isa_write[wl] fixed
37 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
38 */
39
40#define XQUAD_PORTIO_BASE 0xfe400000
41#define XQUAD_PORTIO_QUAD 0x40000 /* 256k per quad. */
42
43#ifdef __KERNEL__
44
45#include <asm-generic/iomap.h>
46
47#include <linux/vmalloc.h>
48
49/*
50 * Convert a virtual cached pointer to an uncached pointer
51 */
52#define xlate_dev_kmem_ptr(p) p
53
54static inline void
55memset_io(volatile void __iomem *addr, unsigned char val, int count)
56{
57 memset((void __force *)addr, val, count);
58}
59
60static inline void
61memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
62{
63 __memcpy(dst, (const void __force *)src, count);
64}
65
66static inline void
67memcpy_toio(volatile void __iomem *dst, const void *src, int count)
68{
69 __memcpy((void __force *)dst, src, count);
70}
71
72/*
73 * ISA space is 'always mapped' on a typical x86 system, no need to
74 * explicitly ioremap() it. The fact that the ISA IO space is mapped
75 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
76 * are physical addresses. The following constant pointer can be
77 * used as the IO-area pointer (it can be iounmapped as well, so the
78 * analogy with PCI is quite large):
79 */
80#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
81
82/*
83 * Cache management
84 *
85 * This needed for two cases
86 * 1. Out of order aware processors
87 * 2. Accidentally out of order processors (PPro errata #51)
88 */
89
90#if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
91
92static inline void flush_write_buffers(void)
93{
94 asm volatile("lock; addl $0,0(%%esp)": : :"memory");
95}
96
97#else
98
99#define flush_write_buffers() do { } while (0)
100
101#endif
102
103#endif /* __KERNEL__ */
104
105extern void native_io_delay(void);
106
107extern int io_delay_type;
108extern void io_delay_init(void);
109
110#if defined(CONFIG_PARAVIRT)
111#include <asm/paravirt.h>
112#else
113
114static inline void slow_down_io(void)
115{
116 native_io_delay();
117#ifdef REALLY_SLOW_IO
118 native_io_delay();
119 native_io_delay();
120 native_io_delay();
121#endif
122}
123
124#endif
125
126#define __BUILDIO(bwl, bw, type) \
127static inline void out##bwl(unsigned type value, int port) \
128{ \
129 out##bwl##_local(value, port); \
130} \
131 \
132static inline unsigned type in##bwl(int port) \
133{ \
134 return in##bwl##_local(port); \
135}
136
137#define BUILDIO(bwl, bw, type) \
138static inline void out##bwl##_local(unsigned type value, int port) \
139{ \
140 asm volatile("out" #bwl " %" #bw "0, %w1" \
141 : : "a"(value), "Nd"(port)); \
142} \
143 \
144static inline unsigned type in##bwl##_local(int port) \
145{ \
146 unsigned type value; \
147 asm volatile("in" #bwl " %w1, %" #bw "0" \
148 : "=a"(value) : "Nd"(port)); \
149 return value; \
150} \
151 \
152static inline void out##bwl##_local_p(unsigned type value, int port) \
153{ \
154 out##bwl##_local(value, port); \
155 slow_down_io(); \
156} \
157 \
158static inline unsigned type in##bwl##_local_p(int port) \
159{ \
160 unsigned type value = in##bwl##_local(port); \
161 slow_down_io(); \
162 return value; \
163} \
164 \
165__BUILDIO(bwl, bw, type) \
166 \
167static inline void out##bwl##_p(unsigned type value, int port) \
168{ \
169 out##bwl(value, port); \
170 slow_down_io(); \
171} \
172 \
173static inline unsigned type in##bwl##_p(int port) \
174{ \
175 unsigned type value = in##bwl(port); \
176 slow_down_io(); \
177 return value; \
178} \
179 \
180static inline void outs##bwl(int port, const void *addr, unsigned long count) \
181{ \
182 asm volatile("rep; outs" #bwl \
183 : "+S"(addr), "+c"(count) : "d"(port)); \
184} \
185 \
186static inline void ins##bwl(int port, void *addr, unsigned long count) \
187{ \
188 asm volatile("rep; ins" #bwl \
189 : "+D"(addr), "+c"(count) : "d"(port)); \
190}
191
192BUILDIO(b, b, char)
193BUILDIO(w, w, short)
194BUILDIO(l, , int)
195
196#endif /* _ASM_X86_IO_32_H */
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