include/asm-i386/io.h

/* */
This source file includes following definitions.
virt_to_phys
phys_to_virt
   1 #ifndef _ASM_IO_H
   2 #define _ASM_IO_H
   3 
   4 /*
   5  * This file contains the definitions for the x86 IO instructions
   6  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
   7  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
   8  * versions of the single-IO instructions (inb_p/inw_p/..).
   9  *
  10  * This file is not meant to be obfuscating: it's just complicated
  11  * to (a) handle it all in a way that makes gcc able to optimize it
  12  * as well as possible and (b) trying to avoid writing the same thing
  13  * over and over again with slight variations and possibly making a
  14  * mistake somewhere.
  15  */
  16 
  17 /*
  18  * Thanks to James van Artsdalen for a better timing-fix than
  19  * the two short jumps: using outb's to a nonexistent port seems
  20  * to guarantee better timings even on fast machines.
  21  *
  22  * On the other hand, I'd like to be sure of a non-existent port:
  23  * I feel a bit unsafe about using 0x80 (should be safe, though)
  24  *
  25  *              Linus
  26  */
  27 
  28 #ifdef SLOW_IO_BY_JUMPING
  29 #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:")
  30 #else
  31 #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80")
  32 #endif
  33 
  34 #ifdef REALLY_SLOW_IO
  35 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
  36 #else
  37 #define SLOW_DOWN_IO __SLOW_DOWN_IO
  38 #endif
  39 
  40 /*
  41  * Change virtual addresses to physical addresses and vv.
  42  * These are trivial on the 1:1 Linux/i386 mapping (but if we ever
  43  * make the kernel segment mapped at 0, we need to do translation
  44  * on the i386 as well)
  45  */
  46 extern inline unsigned long virt_to_phys(volatile void * address)
     /*  */
  47 {
  48         return (unsigned long) address;
  49 }
  50 
  51 extern inline void * phys_to_virt(unsigned long address)
     /*  */
  52 {
  53         return (void *) address;
  54 }
  55 
  56 /*
  57  * IO bus memory addresses are also 1:1 with the physical address
  58  */
  59 #define virt_to_bus virt_to_phys
  60 #define bus_to_virt phys_to_virt
  61 
  62 /*
  63  * readX/writeX() are used to access memory mapped devices. On some
  64  * architectures the memory mapped IO stuff needs to be accessed
  65  * differently. On the x86 architecture, we just read/write the
  66  * memory location directly.
  67  */
  68 #define readb(addr) (*(volatile unsigned char *) (addr))
  69 #define readw(addr) (*(volatile unsigned short *) (addr))
  70 #define readl(addr) (*(volatile unsigned int *) (addr))
  71 
  72 #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
  73 #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
  74 #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
  75 
  76 #define memset_io(a,b,c)        memset((void *)(a),(b),(c))
  77 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
  78 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
  79 
  80 /*
  81  * Again, i386 does not require mem IO specific function.
  82  */
  83 
  84 #define eth_io_copy_and_sum(a,b,c,d)    eth_copy_and_sum((a),(void *)(b),(c),(d))
  85 
  86 /*
  87  * Talk about misusing macros..
  88  */
  89 
  90 #define __OUT1(s,x) \
  91 extern inline void __out##s(unsigned x value, unsigned short port) {
  92 
  93 #define __OUT2(s,s1,s2) \
  94 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
  95 
  96 #define __OUT(s,s1,x) \
  97 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
  98 __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
  99 __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
 100 __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
 101 
 102 #define __IN1(s) \
 103 extern inline RETURN_TYPE __in##s(unsigned short port) { RETURN_TYPE _v;
 104 
 105 #define __IN2(s,s1,s2) \
 106 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
 107 
 108 #define __IN(s,s1,i...) \
 109 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
 110 __IN1(s##c) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
 111 __IN1(s##_p) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
 112 __IN1(s##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
 113 
 114 #define __INS(s) \
 115 extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
 116 { __asm__ __volatile__ ("cld ; rep ; ins" #s \
 117 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
 118 
 119 #define __OUTS(s) \
 120 extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
 121 { __asm__ __volatile__ ("cld ; rep ; outs" #s \
 122 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
 123 
 124 #define RETURN_TYPE unsigned char
 125 /* __IN(b,"b","0" (0)) */
 126 __IN(b,"")
 127 #undef RETURN_TYPE
 128 #define RETURN_TYPE unsigned short
 129 /* __IN(w,"w","0" (0)) */
 130 __IN(w,"")
 131 #undef RETURN_TYPE
 132 #define RETURN_TYPE unsigned int
 133 __IN(l,"")
 134 #undef RETURN_TYPE
 135 
 136 __OUT(b,"b",char)
 137 __OUT(w,"w",short)
 138 __OUT(l,,int)
 139 
 140 __INS(b)
 141 __INS(w)
 142 __INS(l)
 143 
 144 __OUTS(b)
 145 __OUTS(w)
 146 __OUTS(l)
 147 
 148 /*
 149  * Note that due to the way __builtin_constant_p() works, you
 150  *  - can't use it inside a inline function (it will never be true)
 151  *  - you don't have to worry about side effects within the __builtin..
 152  */
 153 #define outb(val,port) \
 154 ((__builtin_constant_p((port)) && (port) < 256) ? \
 155         __outbc((val),(port)) : \
 156         __outb((val),(port)))
 157 
 158 #define inb(port) \
 159 ((__builtin_constant_p((port)) && (port) < 256) ? \
 160         __inbc(port) : \
 161         __inb(port))
 162 
 163 #define outb_p(val,port) \
 164 ((__builtin_constant_p((port)) && (port) < 256) ? \
 165         __outbc_p((val),(port)) : \
 166         __outb_p((val),(port)))
 167 
 168 #define inb_p(port) \
 169 ((__builtin_constant_p((port)) && (port) < 256) ? \
 170         __inbc_p(port) : \
 171         __inb_p(port))
 172 
 173 #define outw(val,port) \
 174 ((__builtin_constant_p((port)) && (port) < 256) ? \
 175         __outwc((val),(port)) : \
 176         __outw((val),(port)))
 177 
 178 #define inw(port) \
 179 ((__builtin_constant_p((port)) && (port) < 256) ? \
 180         __inwc(port) : \
 181         __inw(port))
 182 
 183 #define outw_p(val,port) \
 184 ((__builtin_constant_p((port)) && (port) < 256) ? \
 185         __outwc_p((val),(port)) : \
 186         __outw_p((val),(port)))
 187 
 188 #define inw_p(port) \
 189 ((__builtin_constant_p((port)) && (port) < 256) ? \
 190         __inwc_p(port) : \
 191         __inw_p(port))
 192 
 193 #define outl(val,port) \
 194 ((__builtin_constant_p((port)) && (port) < 256) ? \
 195         __outlc((val),(port)) : \
 196         __outl((val),(port)))
 197 
 198 #define inl(port) \
 199 ((__builtin_constant_p((port)) && (port) < 256) ? \
 200         __inlc(port) : \
 201         __inl(port))
 202 
 203 #define outl_p(val,port) \
 204 ((__builtin_constant_p((port)) && (port) < 256) ? \
 205         __outlc_p((val),(port)) : \
 206         __outl_p((val),(port)))
 207 
 208 #define inl_p(port) \
 209 ((__builtin_constant_p((port)) && (port) < 256) ? \
 210         __inlc_p(port) : \
 211         __inl_p(port))
 212 
 213 #endif
/* */
root/include/asm-i386/io.h

INCLUDED FROM

DEFINITIONS
