1#ifndef _ASM_IO_H 2#define _ASM_IO_H 3 4#include <linux/config.h> 5 6/* 7 * This file contains the definitions for the x86 IO instructions 8 * inb/inw/inl/outb/outw/outl and the "string versions" of the same 9 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing" 10 * versions of the single-IO instructions (inb_p/inw_p/..). 11 * 12 * This file is not meant to be obfuscating: it's just complicated 13 * to (a) handle it all in a way that makes gcc able to optimize it 14 * as well as possible and (b) trying to avoid writing the same thing 15 * over and over again with slight variations and possibly making a 16 * mistake somewhere. 17 */ 18 19/* 20 * Thanks to James van Artsdalen for a better timing-fix than 21 * the two short jumps: using outb's to a nonexistent port seems 22 * to guarantee better timings even on fast machines. 23 * 24 * On the other hand, I'd like to be sure of a non-existent port: 25 * I feel a bit unsafe about using 0x80 (should be safe, though) 26 * 27 * Linus 28 */ 29 30 /* 31 * Bit simplified and optimized by Jan Hubicka 32 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999. 33 * 34 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added, 35 * isa_read[wl] and isa_write[wl] fixed 36 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br> 37 */ 38 39#ifdef SLOW_IO_BY_JUMPING 40#define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:" 41#else 42#define __SLOW_DOWN_IO "\noutb %%al,$0x80" 43#endif 44 45#ifdef REALLY_SLOW_IO 46#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO 47#else 48#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO 49#endif 50 51/* 52 * Talk about misusing macros.. 53 */ 54#define __OUT1(s,x) \ 55extern inline void out##s(unsigned x value, unsigned short port) { 56 57#define __OUT2(s,s1,s2) \ 58__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1" 59 60#define __OUT(s,s1,x) \ 61__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \ 62__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \ 63 64#define __IN1(s) \ 65extern inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v; 66 67#define __IN2(s,s1,s2) \ 68__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0" 69 70#define __IN(s,s1,i...) \ 71__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \ 72__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \ 73 74#define __INS(s) \ 75extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \ 76{ __asm__ __volatile__ ("rep ; ins" #s \ 77: "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } 78 79#define __OUTS(s) \ 80extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \ 81{ __asm__ __volatile__ ("rep ; outs" #s \ 82: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } 83 84#define RETURN_TYPE unsigned char 85__IN(b,"") 86#undef RETURN_TYPE 87#define RETURN_TYPE unsigned short 88__IN(w,"") 89#undef RETURN_TYPE 90#define RETURN_TYPE unsigned int 91__IN(l,"") 92#undef RETURN_TYPE 93 94__OUT(b,"b",char) 95__OUT(w,"w",short) 96__OUT(l,,int) 97 98__INS(b) 99__INS(w) 100__INS(l) 101 102__OUTS(b) 103__OUTS(w) 104__OUTS(l) 105 106#define IO_SPACE_LIMIT 0xffff 107 108#ifdef __KERNEL__ 109 110#include <linux/vmalloc.h> 111 112/* 113 * Temporary debugging check to catch old code using 114 * unmapped ISA addresses. Will be removed in 2.4. 115 */ 116#ifdef CONFIG_IO_DEBUG 117 extern void *__io_virt_debug(unsigned long x, const char *file, int line); 118 extern unsigned long __io_phys_debug(unsigned long x, const char *file, int line); 119 #define __io_virt(x) __io_virt_debug((unsigned long)(x), __FILE__, __LINE__) 120//#define __io_phys(x) __io_phys_debug((unsigned long)(x), __FILE__, __LINE__) 121#else 122 #define __io_virt(x) ((void *)(x)) 123//#define __io_phys(x) __pa(x) 124#endif 125 126/* 127 * Change virtual addresses to physical addresses and vv. 128 * These are pretty trivial 129 */ 130extern inline unsigned long virt_to_phys(volatile void * address) 131{ 132 return __pa(address); 133} 134 135extern inline void * phys_to_virt(unsigned long address) 136{ 137 return __va(address); 138} 139 140/* 141 * Change "struct page" to physical address. 142 */ 143#ifdef CONFIG_DISCONTIGMEM 144#include <asm/mmzone.h> 145#else 146#define page_to_phys(page) (((page) - mem_map) << PAGE_SHIFT) 147#endif 148 149extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags); 150 151extern inline void * ioremap (unsigned long offset, unsigned long size) 152{ 153 return __ioremap(offset, size, 0); 154} 155 156/* 157 * This one maps high address device memory and turns off caching for that area. 158 * it's useful if some control registers are in such an area and write combining 159 * or read caching is not desirable: 160 */ 161extern inline void * ioremap_nocache (unsigned long offset, unsigned long size) 162{ 163 return __ioremap(offset, size, _PAGE_PCD); 164} 165 166extern void iounmap(void *addr); 167 168/* 169 * IO bus memory addresses are also 1:1 with the physical address 170 */ 171#define virt_to_bus virt_to_phys 172#define bus_to_virt phys_to_virt 173#define page_to_bus page_to_phys 174 175/* 176 * readX/writeX() are used to access memory mapped devices. On some 177 * architectures the memory mapped IO stuff needs to be accessed 178 * differently. On the x86 architecture, we just read/write the 179 * memory location directly. 180 */ 181 182#define readb(addr) (*(volatile unsigned char *) __io_virt(addr)) 183#define readw(addr) (*(volatile unsigned short *) __io_virt(addr)) 184#define readl(addr) (*(volatile unsigned int *) __io_virt(addr)) 185#define __raw_readb readb 186#define __raw_readw readw 187#define __raw_readl readl 188 189#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b)) 190#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b)) 191#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b)) 192#define __raw_writeb writeb 193#define __raw_writew writew 194#define __raw_writel writel 195 196void *memcpy_fromio(void*,const void*,unsigned); 197void *memcpy_toio(void*,const void*,unsigned); 198 199#define memset_io(a,b,c) memset(__io_virt(a),(b),(c)) 200 201/* 202 * ISA space is 'always mapped' on a typical x86 system, no need to 203 * explicitly ioremap() it. The fact that the ISA IO space is mapped 204 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values 205 * are physical addresses. The following constant pointer can be 206 * used as the IO-area pointer (it can be iounmapped as well, so the 207 * analogy with PCI is quite large): 208 */ 209#define __ISA_IO_base ((char *)(PAGE_OFFSET)) 210 211#define isa_readb(a) readb(__ISA_IO_base + (a)) 212#define isa_readw(a) readw(__ISA_IO_base + (a)) 213#define isa_readl(a) readl(__ISA_IO_base + (a)) 214#define isa_writeb(b,a) writeb(b,__ISA_IO_base + (a)) 215#define isa_writew(w,a) writew(w,__ISA_IO_base + (a)) 216#define isa_writel(l,a) writel(l,__ISA_IO_base + (a)) 217#define isa_memset_io(a,b,c) memset_io(__ISA_IO_base + (a),(b),(c)) 218#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c)) 219#define isa_memcpy_toio(a,b,c) memcpy_toio(__ISA_IO_base + (a),(b),(c)) 220 221 222/* 223 * Again, x86-64 does not require mem IO specific function. 224 */ 225 226#define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),__io_virt(b),(c),(d)) 227#define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),__io_virt(__ISA_IO_base + (b)),(c),(d)) 228 229static inline int check_signature(unsigned long io_addr, 230 const unsigned char *signature, int length) 231{ 232 int retval = 0; 233 do { 234 if (readb(io_addr) != *signature) 235 goto out; 236 io_addr++; 237 signature++; 238 length--; 239 } while (length); 240 retval = 1; 241out: 242 return retval; 243} 244 245static inline int isa_check_signature(unsigned long io_addr, 246 const unsigned char *signature, int length) 247{ 248 int retval = 0; 249 do { 250 if (isa_readb(io_addr) != *signature) 251 goto out; 252 io_addr++; 253 signature++; 254 length--; 255 } while (length); 256 retval = 1; 257out: 258 return retval; 259} 260 261/* Nothing to do */ 262 263#define dma_cache_inv(_start,_size) do { } while (0) 264#define dma_cache_wback(_start,_size) do { } while (0) 265#define dma_cache_wback_inv(_start,_size) do { } while (0) 266 267#define flush_write_buffers() 268 269#endif /* __KERNEL__ */ 270 271#endif 272