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) \ 69extern void __out##s(unsigned x value, unsigned short port); \ 70extern 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) \ 82extern unsigned x __in##s(unsigned short port); \ 83extern 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) \ 95extern void ins##s(unsigned short port, void * addr, unsigned long count); \ 96extern 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) \ 101extern void outs##s(unsigned short port, const void * addr, unsigned long count); \ 102extern 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 188