arch/x86/include/asm/io_32.h

   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
  54 static inline void
  55 memset_io(volatile void __iomem *addr, unsigned char val, int count)
  56 {
  57         memset((void __force *)addr, val, count);
  58 }
  59
  60 static inline void
  61 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
  62 {
  63         __memcpy(dst, (const void __force *)src, count);
  64 }
  65
  66 static inline void
  67 memcpy_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
  92 static 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
 105 extern void native_io_delay(void);
 106
 107 extern int io_delay_type;
 108 extern void io_delay_init(void);
 109
 110 #if defined(CONFIG_PARAVIRT)
 111 #include <asm/paravirt.h>
 112 #else
 113
 114 static 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)                                \
 127 static inline void out##bwl(unsigned type value, int port)      \
 128 {                                                               \
 129         out##bwl##_local(value, port);                          \
 130 }                                                               \
 131                                                                 \
 132 static inline unsigned type in##bwl(int port)                   \
 133 {                                                               \
 134         return in##bwl##_local(port);                           \
 135 }
 136
 137 #define BUILDIO(bwl, bw, type)                                          \
 138 static 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                                                                         \
 144 static 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                                                                         \
 152 static inline void out##bwl##_local_p(unsigned type value, int port)    \
 153 {                                                                       \
 154         out##bwl##_local(value, port);                                  \
 155         slow_down_io();                                                 \
 156 }                                                                       \
 157                                                                         \
 158 static 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                                                                         \
 167 static inline void out##bwl##_p(unsigned type value, int port)          \
 168 {                                                                       \
 169         out##bwl(value, port);                                          \
 170         slow_down_io();                                                 \
 171 }                                                                       \
 172                                                                         \
 173 static 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                                                                         \
 180 static 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                                                                         \
 186 static 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
 192 BUILDIO(b, b, char)
 193 BUILDIO(w, w, short)
 194 BUILDIO(l, , int)
 195
 196 #endif /* _ASM_X86_IO_32_H */