arch/x86/include/asm/io_64.h

   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
  38 extern void native_io_delay(void);
  39
  40 extern int io_delay_type;
  41 extern void io_delay_init(void);
  42
  43 #if defined(CONFIG_PARAVIRT)
  44 #include <asm/paravirt.h>
  45 #else
  46
  47 static 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)                                                    \
  62 static inline void out##s(unsigned x value, unsigned short port) {
  63
  64 #define __OUT2(s, s1, s2)                               \
  65 asm 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)                                                        \
  80 static 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)                                                        \
 100 static 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)                                                       \
 109 static 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
 145 void __memcpy_fromio(void *, unsigned long, unsigned);
 146 void __memcpy_toio(unsigned long, const void *, unsigned);
 147
 148 static 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
 154 static 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
 160 void 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 */