1 #ifndef _ASM_X86_IO_32_H
2 #define _ASM_X86_IO_32_H
4 #include <linux/string.h>
5 #include <linux/compiler.h>
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
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)
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>
42 #include <asm-generic/iomap.h>
44 #include <linux/vmalloc.h>
47 * Convert a virtual cached pointer to an uncached pointer
49 #define xlate_dev_kmem_ptr(p) p
52 memset_io(volatile void __iomem *addr, unsigned char val, size_t count)
54 memset((void __force *)addr, val, count);
58 memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count)
60 memcpy(dst, (const void __force *)src, count);
64 memcpy_toio(volatile void __iomem *dst, const void *src, size_t count)
66 memcpy((void __force *)dst, src, count);
70 * ISA space is 'always mapped' on a typical x86 system, no need to
71 * explicitly ioremap() it. The fact that the ISA IO space is mapped
72 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
73 * are physical addresses. The following constant pointer can be
74 * used as the IO-area pointer (it can be iounmapped as well, so the
75 * analogy with PCI is quite large):
77 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
82 * This needed for two cases
83 * 1. Out of order aware processors
84 * 2. Accidentally out of order processors (PPro errata #51)
87 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
89 static inline void flush_write_buffers(void)
91 asm volatile("lock; addl $0,0(%%esp)": : :"memory");
96 #define flush_write_buffers() do { } while (0)
100 #endif /* __KERNEL__ */
102 extern void native_io_delay(void);
104 extern int io_delay_type;
105 extern void io_delay_init(void);
107 #if defined(CONFIG_PARAVIRT)
108 #include <asm/paravirt.h>
111 static inline void slow_down_io(void)
114 #ifdef REALLY_SLOW_IO
123 #define BUILDIO(bwl, bw, type) \
124 static inline void out##bwl(unsigned type value, int port) \
126 asm volatile("out" #bwl " %" #bw "0, %w1" \
127 : : "a"(value), "Nd"(port)); \
130 static inline unsigned type in##bwl(int port) \
132 unsigned type value; \
133 asm volatile("in" #bwl " %w1, %" #bw "0" \
134 : "=a"(value) : "Nd"(port)); \
138 static inline void out##bwl##_p(unsigned type value, int port) \
140 out##bwl(value, port); \
144 static inline unsigned type in##bwl##_p(int port) \
146 unsigned type value = in##bwl(port); \
151 static inline void outs##bwl(int port, const void *addr, unsigned long count) \
153 asm volatile("rep; outs" #bwl \
154 : "+S"(addr), "+c"(count) : "d"(port)); \
157 static inline void ins##bwl(int port, void *addr, unsigned long count) \
159 asm volatile("rep; ins" #bwl \
160 : "+D"(addr), "+c"(count) : "d"(port)); \
167 #endif /* _ASM_X86_IO_32_H */