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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 IO_SPACE_LIMIT 0xffff
  41
  42 #define XQUAD_PORTIO_BASE 0xfe400000
  43 #define XQUAD_PORTIO_QUAD 0x40000  /* 256k per quad. */
  44
  45 #ifdef __KERNEL__
  46
  47 #include <asm-generic/iomap.h>
  48
  49 #include <linux/vmalloc.h>
  50
  51 /*
  52  * Convert a virtual cached pointer to an uncached pointer
  53  */
  54 #define xlate_dev_kmem_ptr(p)   p
  55
  56 static inline void
  57 memset_io(volatile void __iomem *addr, unsigned char val, int count)
  58 {
  59         memset((void __force *)addr, val, count);
  60 }
  61
  62 static inline void
  63 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
  64 {
  65         __memcpy(dst, (const void __force *)src, count);
  66 }
  67
  68 static inline void
  69 memcpy_toio(volatile void __iomem *dst, const void *src, int count)
  70 {
  71         __memcpy((void __force *)dst, src, count);
  72 }
  73
  74 /*
  75  * ISA space is 'always mapped' on a typical x86 system, no need to
  76  * explicitly ioremap() it. The fact that the ISA IO space is mapped
  77  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
  78  * are physical addresses. The following constant pointer can be
  79  * used as the IO-area pointer (it can be iounmapped as well, so the
  80  * analogy with PCI is quite large):
  81  */
  82 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
  83
  84 /*
  85  *      Cache management
  86  *
  87  *      This needed for two cases
  88  *      1. Out of order aware processors
  89  *      2. Accidentally out of order processors (PPro errata #51)
  90  */
  91
  92 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
  93
  94 static inline void flush_write_buffers(void)
  95 {
  96         asm volatile("lock; addl $0,0(%%esp)": : :"memory");
  97 }
  98
  99 #else
 100
 101 #define flush_write_buffers() do { } while (0)
 102
 103 #endif
 104
 105 #endif /* __KERNEL__ */
 106
 107 extern void native_io_delay(void);
 108
 109 extern int io_delay_type;
 110 extern void io_delay_init(void);
 111
 112 #if defined(CONFIG_PARAVIRT)
 113 #include <asm/paravirt.h>
 114 #else
 115
 116 static inline void slow_down_io(void)
 117 {
 118         native_io_delay();
 119 #ifdef REALLY_SLOW_IO
 120         native_io_delay();
 121         native_io_delay();
 122         native_io_delay();
 123 #endif
 124 }
 125
 126 #endif
 127
 128 #define __BUILDIO(bwl, bw, type)                                \
 129 static inline void out##bwl(unsigned type value, int port)      \
 130 {                                                               \
 131         out##bwl##_local(value, port);                          \
 132 }                                                               \
 133                                                                 \
 134 static inline unsigned type in##bwl(int port)                   \
 135 {                                                               \
 136         return in##bwl##_local(port);                           \
 137 }
 138
 139 #define BUILDIO(bwl, bw, type)                                          \
 140 static inline void out##bwl##_local(unsigned type value, int port)      \
 141 {                                                                       \
 142         asm volatile("out" #bwl " %" #bw "0, %w1"               \
 143                      : : "a"(value), "Nd"(port));                       \
 144 }                                                                       \
 145                                                                         \
 146 static inline unsigned type in##bwl##_local(int port)                   \
 147 {                                                                       \
 148         unsigned type value;                                            \
 149         asm volatile("in" #bwl " %w1, %" #bw "0"                \
 150                      : "=a"(value) : "Nd"(port));                       \
 151         return value;                                                   \
 152 }                                                                       \
 153                                                                         \
 154 static inline void out##bwl##_local_p(unsigned type value, int port)    \
 155 {                                                                       \
 156         out##bwl##_local(value, port);                                  \
 157         slow_down_io();                                                 \
 158 }                                                                       \
 159                                                                         \
 160 static inline unsigned type in##bwl##_local_p(int port)                 \
 161 {                                                                       \
 162         unsigned type value = in##bwl##_local(port);                    \
 163         slow_down_io();                                                 \
 164         return value;                                                   \
 165 }                                                                       \
 166                                                                         \
 167 __BUILDIO(bwl, bw, type)                                                \
 168                                                                         \
 169 static inline void out##bwl##_p(unsigned type value, int port)          \
 170 {                                                                       \
 171         out##bwl(value, port);                                          \
 172         slow_down_io();                                                 \
 173 }                                                                       \
 174                                                                         \
 175 static inline unsigned type in##bwl##_p(int port)                       \
 176 {                                                                       \
 177         unsigned type value = in##bwl(port);                            \
 178         slow_down_io();                                                 \
 179         return value;                                                   \
 180 }                                                                       \
 181                                                                         \
 182 static inline void outs##bwl(int port, const void *addr, unsigned long count) \
 183 {                                                                       \
 184         asm volatile("rep; outs" #bwl                                   \
 185                      : "+S"(addr), "+c"(count) : "d"(port));            \
 186 }                                                                       \
 187                                                                         \
 188 static inline void ins##bwl(int port, void *addr, unsigned long count)  \
 189 {                                                                       \
 190         asm volatile("rep; ins" #bwl                                    \
 191                      : "+D"(addr), "+c"(count) : "d"(port));            \
 192 }
 193
 194 BUILDIO(b, b, char)
 195 BUILDIO(w, w, short)
 196 BUILDIO(l, , int)
 197
 198 #endif /* _ASM_X86_IO_32_H */