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[linux-ginger.git] / 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
4 #include <linux/string.h>
5 #include <linux/compiler.h>
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/..).
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.
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.
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)
28 * Linus
32 * Bit simplified and optimized by Jan Hubicka
33 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
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>
40 #define XQUAD_PORTIO_BASE 0xfe400000
41 #define XQUAD_PORTIO_QUAD 0x40000 /* 256k per quad. */
43 #ifdef __KERNEL__
45 #include <asm-generic/iomap.h>
47 #include <linux/vmalloc.h>
50 * Convert a virtual cached pointer to an uncached pointer
52 #define xlate_dev_kmem_ptr(p) p
54 static inline void
55 memset_io(volatile void __iomem *addr, unsigned char val, int count)
57 memset((void __force *)addr, val, count);
60 static inline void
61 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
63 __memcpy(dst, (const void __force *)src, count);
66 static inline void
67 memcpy_toio(volatile void __iomem *dst, const void *src, int count)
69 __memcpy((void __force *)dst, src, count);
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):
80 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
83 * Cache management
85 * This needed for two cases
86 * 1. Out of order aware processors
87 * 2. Accidentally out of order processors (PPro errata #51)
90 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
92 static inline void flush_write_buffers(void)
94 asm volatile("lock; addl $0,0(%%esp)": : :"memory");
97 #else
99 #define flush_write_buffers() do { } while (0)
101 #endif
103 #endif /* __KERNEL__ */
105 extern void native_io_delay(void);
107 extern int io_delay_type;
108 extern void io_delay_init(void);
110 #if defined(CONFIG_PARAVIRT)
111 #include <asm/paravirt.h>
112 #else
114 static inline void slow_down_io(void)
116 native_io_delay();
117 #ifdef REALLY_SLOW_IO
118 native_io_delay();
119 native_io_delay();
120 native_io_delay();
121 #endif
124 #endif
126 #define __BUILDIO(bwl, bw, type) \
127 static inline void out##bwl(unsigned type value, int port) \
129 out##bwl##_local(value, port); \
132 static inline unsigned type in##bwl(int port) \
134 return in##bwl##_local(port); \
137 #define BUILDIO(bwl, bw, type) \
138 static inline void out##bwl##_local(unsigned type value, int port) \
140 asm volatile("out" #bwl " %" #bw "0, %w1" \
141 : : "a"(value), "Nd"(port)); \
144 static inline unsigned type in##bwl##_local(int port) \
146 unsigned type value; \
147 asm volatile("in" #bwl " %w1, %" #bw "0" \
148 : "=a"(value) : "Nd"(port)); \
149 return value; \
152 static inline void out##bwl##_local_p(unsigned type value, int port) \
154 out##bwl##_local(value, port); \
155 slow_down_io(); \
158 static inline unsigned type in##bwl##_local_p(int port) \
160 unsigned type value = in##bwl##_local(port); \
161 slow_down_io(); \
162 return value; \
165 __BUILDIO(bwl, bw, type) \
167 static inline void out##bwl##_p(unsigned type value, int port) \
169 out##bwl(value, port); \
170 slow_down_io(); \
173 static inline unsigned type in##bwl##_p(int port) \
175 unsigned type value = in##bwl(port); \
176 slow_down_io(); \
177 return value; \
180 static inline void outs##bwl(int port, const void *addr, unsigned long count) \
182 asm volatile("rep; outs" #bwl \
183 : "+S"(addr), "+c"(count) : "d"(port)); \
186 static inline void ins##bwl(int port, void *addr, unsigned long count) \
188 asm volatile("rep; ins" #bwl \
189 : "+D"(addr), "+c"(count) : "d"(port)); \
192 BUILDIO(b, b, char)
193 BUILDIO(w, w, short)
194 BUILDIO(l, , int)
196 #endif /* _ASM_X86_IO_32_H */