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 188
