arch/common/boot/grub/netboot/linux-asm-io.h

   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  * readX/writeX() are used to access memory mapped devices. On some
  42  * architectures the memory mapped IO stuff needs to be accessed
  43  * differently. On the x86 architecture, we just read/write the
  44  * memory location directly.
  45  */
  46 #define readb(addr) (*(volatile unsigned char *) (addr))
  47 #define readw(addr) (*(volatile unsigned short *) (addr))
  48 #define readl(addr) (*(volatile unsigned int *) (addr))
  49
  50 #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
  51 #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
  52 #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
  53
  54 #define memset_io(a,b,c)        memset((void *)(a),(b),(c))
  55 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
  56 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
  57
  58 /*
  59  * Again, i386 does not require mem IO specific function.
  60  */
  61
  62 #define eth_io_copy_and_sum(a,b,c,d)    eth_copy_and_sum((a),(void *)(b),(c),(d))
  63
  64 /*
  65  * Talk about misusing macros..
  66  */
  67
  68 #define __OUT1(s,x) \
  69 extern void __out##s(unsigned x value, unsigned short port); \
  70 extern inline void __out##s(unsigned x value, unsigned short port) {
  71
  72 #define __OUT2(s,s1,s2) \
  73 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
  74
  75 #define __OUT(s,s1,x) \
  76 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); } \
  77 __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \
  78 __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \
  79 __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; }
  80
  81 #define __IN1(s,x) \
  82 extern unsigned x __in##s(unsigned short port); \
  83 extern inline unsigned x __in##s(unsigned short port) { unsigned x _v;
  84
  85 #define __IN2(s,s1,s2) \
  86 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
  87
  88 #define __IN(s,s1,x,i...) \
  89 __IN1(s,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); return _v; } \
  90 __IN1(s##c,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \
  91 __IN1(s##_p,x) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \
  92 __IN1(s##c_p,x) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; }
  93
  94 #define __INS(s) \
  95 extern void ins##s(unsigned short port, void * addr, unsigned long count); \
  96 extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \
  97 { __asm__ __volatile__ ("cld ; rep ; ins" #s \
  98 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
  99
 100 #define __OUTS(s) \
 101 extern void outs##s(unsigned short port, const void * addr, unsigned long  count); \
 102 extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
 103 { __asm__ __volatile__ ("cld ; rep ; outs" #s \
 104 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
 105
 106 __IN(b,"", char)
 107 __IN(w,"",short)
 108 __IN(l,"", long)
 109
 110 __OUT(b,"b",char)
 111 __OUT(w,"w",short)
 112 __OUT(l,,int)
 113
 114 __INS(b)
 115 __INS(w)
 116 __INS(l)
 117
 118 __OUTS(b)
 119 __OUTS(w)
 120 __OUTS(l)
 121
 122 /*
 123  * Note that due to the way __builtin_constant_p() works, you
 124  *  - can't use it inside a inline function (it will never be true)
 125  *  - you don't have to worry about side effects within the __builtin..
 126  */
 127 #define outb(val,port) \
 128 ((__builtin_constant_p((port)) && (port) < 256) ? \
 129         __outbc((val),(port)) : \
 130         __outb((val),(port)))
 131
 132 #define inb(port) \
 133 ((__builtin_constant_p((port)) && (port) < 256) ? \
 134         __inbc(port) : \
 135         __inb(port))
 136
 137 #define outb_p(val,port) \
 138 ((__builtin_constant_p((port)) && (port) < 256) ? \
 139         __outbc_p((val),(port)) : \
 140         __outb_p((val),(port)))
 141
 142 #define inb_p(port) \
 143 ((__builtin_constant_p((port)) && (port) < 256) ? \
 144         __inbc_p(port) : \
 145         __inb_p(port))
 146
 147 #define outw(val,port) \
 148 ((__builtin_constant_p((port)) && (port) < 256) ? \
 149         __outwc((val),(port)) : \
 150         __outw((val),(port)))
 151
 152 #define inw(port) \
 153 ((__builtin_constant_p((port)) && (port) < 256) ? \
 154         __inwc(port) : \
 155         __inw(port))
 156
 157 #define outw_p(val,port) \
 158 ((__builtin_constant_p((port)) && (port) < 256) ? \
 159         __outwc_p((val),(port)) : \
 160         __outw_p((val),(port)))
 161
 162 #define inw_p(port) \
 163 ((__builtin_constant_p((port)) && (port) < 256) ? \
 164         __inwc_p(port) : \
 165         __inw_p(port))
 166
 167 #define outl(val,port) \
 168 ((__builtin_constant_p((port)) && (port) < 256) ? \
 169         __outlc((val),(port)) : \
 170         __outl((val),(port)))
 171
 172 #define inl(port) \
 173 ((__builtin_constant_p((port)) && (port) < 256) ? \
 174         __inlc(port) : \
 175         __inl(port))
 176
 177 #define outl_p(val,port) \
 178 ((__builtin_constant_p((port)) && (port) < 256) ? \
 179         __outlc_p((val),(port)) : \
 180         __outl_p((val),(port)))
 181
 182 #define inl_p(port) \
 183 ((__builtin_constant_p((port)) && (port) < 256) ? \
 184         __inlc_p(port) : \
 185         __inl_p(port))
 186
 187 #endif