LXR linux/arch/x86/include/asm/io

   1#ifndef _ASM_X86_IO_64_H
   2#define _ASM_X86_IO_64_H
   3
   4
   5/*
   6 * This file contains the definitions for the x86 IO instructions
   7 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
   8 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
   9 * versions of the single-IO instructions (inb_p/inw_p/..).
  10 *
  11 * This file is not meant to be obfuscating: it's just complicated
  12 * to (a) handle it all in a way that makes gcc able to optimize it
  13 * as well as possible and (b) trying to avoid writing the same thing
  14 * over and over again with slight variations and possibly making a
  15 * mistake somewhere.
  16 */
  17
  18/*
  19 * Thanks to James van Artsdalen for a better timing-fix than
  20 * the two short jumps: using outb's to a nonexistent port seems
  21 * to guarantee better timings even on fast machines.
  22 *
  23 * On the other hand, I'd like to be sure of a non-existent port:
  24 * I feel a bit unsafe about using 0x80 (should be safe, though)
  25 *
  26 *              Linus
  27 */
  28
  29 /*
  30  *  Bit simplified and optimized by Jan Hubicka
  31  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
  32  *
  33  *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
  34  *  isa_read[wl] and isa_write[wl] fixed
  35  *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  36  */
  37
  38extern void native_io_delay(void);
  39
  40extern int io_delay_type;
  41extern void io_delay_init(void);
  42
  43#if defined(CONFIG_PARAVIRT)
  44#include <asm/paravirt.h>
  45#else
  46
  47static inline void slow_down_io(void)
  48{
  49        native_io_delay();
  50#ifdef REALLY_SLOW_IO
  51        native_io_delay();
  52        native_io_delay();
  53        native_io_delay();
  54#endif
  55}
  56#endif
  57
  58/*
  59 * Talk about misusing macros..
  60 */
  61#define __OUT1(s, x)                                                    \
  62static inline void out##s(unsigned x value, unsigned short port) {
  63
  64#define __OUT2(s, s1, s2)                               \
  65asm volatile ("out" #s " %" s1 "0,%" s2 "1"
  66
  67#ifndef REALLY_SLOW_IO
  68#define REALLY_SLOW_IO
  69#define UNSET_REALLY_SLOW_IO
  70#endif
  71
  72#define __OUT(s, s1, x)                                                 \
  73        __OUT1(s, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port));  \
  74        }                                                               \
  75        __OUT1(s##_p, x) __OUT2(s, s1, "w") : : "a" (value), "Nd" (port)); \
  76        slow_down_io();                                                 \
  77}
  78
  79#define __IN1(s)                                                        \
  80static inline RETURN_TYPE in##s(unsigned short port)                    \
  81{                                                                       \
  82        RETURN_TYPE _v;
  83
  84#define __IN2(s, s1, s2)                                                \
  85        asm volatile ("in" #s " %" s2 "1,%" s1 "0"
  86
  87#define __IN(s, s1, i...)                                               \
  88        __IN1(s) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i);     \
  89        return _v;                                                      \
  90        }                                                               \
  91        __IN1(s##_p) __IN2(s, s1, "w") : "=a" (_v) : "Nd" (port), ##i); \
  92        slow_down_io(); \
  93        return _v; }
  94
  95#ifdef UNSET_REALLY_SLOW_IO
  96#undef REALLY_SLOW_IO
  97#endif
  98
  99#define __INS(s)                                                        \
 100static inline void ins##s(unsigned short port, void *addr,              \
 101                          unsigned long count)                          \
 102{                                                                       \
 103        asm volatile ("rep ; ins" #s                                    \
 104                      : "=D" (addr), "=c" (count)                       \
 105                      : "d" (port), "0" (addr), "1" (count));           \
 106}
 107
 108#define __OUTS(s)                                                       \
 109static inline void outs##s(unsigned short port, const void *addr,       \
 110                           unsigned long count)                         \
 111{                                                                       \
 112        asm volatile ("rep ; outs" #s                                   \
 113                      : "=S" (addr), "=c" (count)                       \
 114                      : "d" (port), "0" (addr), "1" (count));           \
 115}
 116
 117#define RETURN_TYPE unsigned char
 118__IN(b, "")
 119#undef RETURN_TYPE
 120#define RETURN_TYPE unsigned short
 121__IN(w, "")
 122#undef RETURN_TYPE
 123#define RETURN_TYPE unsigned int
 124__IN(l, "")
 125#undef RETURN_TYPE
 126
 127__OUT(b, "b", char)
 128__OUT(w, "w", short)
 129__OUT(l, , int)
 130
 131__INS(b)
 132__INS(w)
 133__INS(l)
 134
 135__OUTS(b)
 136__OUTS(w)
 137__OUTS(l)
 138
 139#if defined(__KERNEL__) && defined(__x86_64__)
 140
 141#include <linux/vmalloc.h>
 142
 143#include <asm-generic/iomap.h>
 144
 145void __memcpy_fromio(void *, unsigned long, unsigned);
 146void __memcpy_toio(unsigned long, const void *, unsigned);
 147
 148static inline void memcpy_fromio(void *to, const volatile void __iomem *from,
 149                                 unsigned len)
 150{
 151        __memcpy_fromio(to, (unsigned long)from, len);
 152}
 153
 154static inline void memcpy_toio(volatile void __iomem *to, const void *from,
 155                               unsigned len)
 156{
 157        __memcpy_toio((unsigned long)to, from, len);
 158}
 159
 160void memset_io(volatile void __iomem *a, int b, size_t c);
 161
 162/*
 163 * ISA space is 'always mapped' on a typical x86 system, no need to
 164 * explicitly ioremap() it. The fact that the ISA IO space is mapped
 165 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
 166 * are physical addresses. The following constant pointer can be
 167 * used as the IO-area pointer (it can be iounmapped as well, so the
 168 * analogy with PCI is quite large):
 169 */
 170#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 171
 172#define flush_write_buffers()
 173
 174/*
 175 * Convert a virtual cached pointer to an uncached pointer
 176 */
 177#define xlate_dev_kmem_ptr(p)   p
 178
 179#endif /* __KERNEL__ */
 180
 181#endif /* _ASM_X86_IO_64_H */
 182