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 /* 29 * Bit simplified and optimized by Jan Hubicka 30 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999. 31 * 32 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added, 33 * isa_read[wl] and isa_write[wl] fixed 34 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br> 35 */ 36 37 #define IO_SPACE_LIMIT 0xffff 38 39 40 #ifdef __KERNEL__ 41 42 43 /* 44 * readX/writeX() are used to access memory mapped devices. On some 45 * architectures the memory mapped IO stuff needs to be accessed 46 * differently. On the x86 architecture, we just read/write the 47 * memory location directly. 48 */ 49 50 #define readb(addr) (*(volatile unsigned char *) (addr)) 51 #define readw(addr) (*(volatile unsigned short *) (addr)) 52 #define readl(addr) (*(volatile unsigned int *) (addr)) 53 #define __raw_readb readb 54 #define __raw_readw readw 55 #define __raw_readl readl 56 57 #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b)) 58 #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b)) 59 #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b)) 60 #define __raw_writeb writeb 61 #define __raw_writew writew 62 #define __raw_writel writel 63 64 #define memset_io(a,b,c) memset((a),(b),(c)) 65 #define memcpy_fromio(a,b,c) memcpy((a),(b),(c)) 66 #define memcpy_toio(a,b,c) memcpy((a),(b),(c)) 67 68 /* 69 * ISA space is 'always mapped' on a typical x86 system, no need to 70 * explicitly ioremap() it. The fact that the ISA IO space is mapped 71 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values 72 * are physical addresses. The following constant pointer can be 73 * used as the IO-area pointer (it can be iounmapped as well, so the 74 * analogy with PCI is quite large): 75 */ 76 #define isa_readb(a) readb((a)) 77 #define isa_readw(a) readw((a)) 78 #define isa_readl(a) readl((a)) 79 #define isa_writeb(b,a) writeb(b,(a)) 80 #define isa_writew(w,a) writew(w,(a)) 81 #define isa_writel(l,a) writel(l,(a)) 82 #define isa_memset_io(a,b,c) memset_io((a),(b),(c)) 83 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c)) 84 #define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c)) 85 86 87 static inline int check_signature(unsigned long io_addr, 88 const unsigned char *signature, int length) 89 { 90 int retval = 0; 91 do { 92 if (readb(io_addr) != *signature) 93 goto out; 94 io_addr++; 95 signature++; 96 length--; 97 } while (length); 98 retval = 1; 99 out: 100 return retval; 101 } 102 103 /** 104 * isa_check_signature - find BIOS signatures 105 * @io_addr: mmio address to check 106 * @signature: signature block 107 * @length: length of signature 108 * 109 * Perform a signature comparison with the ISA mmio address io_addr. 110 * Returns 1 on a match. 111 * 112 * This function is deprecated. New drivers should use ioremap and 113 * check_signature. 114 */ 115 116 117 static inline int isa_check_signature(unsigned long io_addr, 118 const unsigned char *signature, int length) 119 { 120 int retval = 0; 121 do { 122 if (isa_readb(io_addr) != *signature) 123 goto out; 124 io_addr++; 125 signature++; 126 length--; 127 } while (length); 128 retval = 1; 129 out: 130 return retval; 131 } 132 133 #endif /* __KERNEL__ */ 134 135 #ifdef SLOW_IO_BY_JUMPING 136 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:" 137 #else 138 #define __SLOW_DOWN_IO "\noutb %%al,$0x80" 139 #endif 140 141 #ifdef REALLY_SLOW_IO 142 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO 143 #else 144 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO 145 #endif 146 147 148 /* 149 * Talk about misusing macros.. 150 */ 151 #define __OUT1(s,x) \ 152 static inline void out##s(unsigned x value, unsigned short port) { 153 154 #define __OUT2(s,s1,s2) \ 155 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1" 156 157 158 #define __OUT(s,s1,x) \ 159 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \ 160 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} 161 162 #define __IN1(s) \ 163 static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v; 164 165 #define __IN2(s,s1,s2) \ 166 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0" 167 168 #define __IN(s,s1,i...) \ 169 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \ 170 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } 171 172 #define __INS(s) \ 173 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \ 174 { __asm__ __volatile__ ("rep ; ins" #s \ 175 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } 176 177 #define __OUTS(s) \ 178 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \ 179 { __asm__ __volatile__ ("rep ; outs" #s \ 180 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } 181 182 #define RETURN_TYPE unsigned char 183 __IN(b,"") 184 #undef RETURN_TYPE 185 #define RETURN_TYPE unsigned short 186 __IN(w,"") 187 #undef RETURN_TYPE 188 #define RETURN_TYPE unsigned int 189 __IN(l,"") 190 #undef RETURN_TYPE 191 192 __OUT(b,"b",char) 193 __OUT(w,"w",short) 194 __OUT(l,,int) 195 196 __INS(b) 197 __INS(w) 198 __INS(l) 199 200 __OUTS(b) 201 __OUTS(w) 202 __OUTS(l) 203 204 static inline void sync(void) 205 { 206 } 207 208 /* 209 * Given a physical address and a length, return a virtual address 210 * that can be used to access the memory range with the caching 211 * properties specified by "flags". 212 */ 213 #define MAP_NOCACHE (0) 214 #define MAP_WRCOMBINE (0) 215 #define MAP_WRBACK (0) 216 #define MAP_WRTHROUGH (0) 217 218 static inline void * 219 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags) 220 { 221 return (void *)paddr; 222 } 223 224 /* 225 * Take down a mapping set up by map_physmem(). 226 */ 227 static inline void unmap_physmem(void *vaddr, unsigned long flags) 228 { 229 230 } 231 232 static inline phys_addr_t virt_to_phys(void * vaddr) 233 { 234 return (phys_addr_t)(vaddr); 235 } 236 237 #endif 238