#ifndef _ASM_IO_H #define _ASM_IO_H /* * This file contains the definitions for the x86 IO instructions * inb/inw/inl/outb/outw/outl and the "string versions" of the same * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing" * versions of the single-IO instructions (inb_p/inw_p/..). * * This file is not meant to be obfuscating: it's just complicated * to (a) handle it all in a way that makes gcc able to optimize it * as well as possible and (b) trying to avoid writing the same thing * over and over again with slight variations and possibly making a * mistake somewhere. */ /* * Thanks to James van Artsdalen for a better timing-fix than * the two short jumps: using outb's to a nonexistent port seems * to guarantee better timings even on fast machines. * * On the other hand, I'd like to be sure of a non-existent port: * I feel a bit unsafe about using 0x80 (should be safe, though) * * Linus */ /* * Bit simplified and optimized by Jan Hubicka * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999. * * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added, * isa_read[wl] and isa_write[wl] fixed * - Arnaldo Carvalho de Melo <acme@conectiva.com.br> */ #define IO_SPACE_LIMIT 0xffff #ifdef __KERNEL__ /* * readX/writeX() are used to access memory mapped devices. On some * architectures the memory mapped IO stuff needs to be accessed * differently. On the x86 architecture, we just read/write the * memory location directly. */ #define readb(addr) (*(volatile unsigned char *) (addr)) #define readw(addr) (*(volatile unsigned short *) (addr)) #define readl(addr) (*(volatile unsigned int *) (addr)) #define __raw_readb readb #define __raw_readw readw #define __raw_readl readl #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b)) #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b)) #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b)) #define __raw_writeb writeb #define __raw_writew writew #define __raw_writel writel #define memset_io(a,b,c) memset((a),(b),(c)) #define memcpy_fromio(a,b,c) memcpy((a),(b),(c)) #define memcpy_toio(a,b,c) memcpy((a),(b),(c)) /* * ISA space is 'always mapped' on a typical x86 system, no need to * explicitly ioremap() it. The fact that the ISA IO space is mapped * to PAGE_OFFSET is pure coincidence - it does not mean ISA values * are physical addresses. The following constant pointer can be * used as the IO-area pointer (it can be iounmapped as well, so the * analogy with PCI is quite large): */ #define isa_readb(a) readb((a)) #define isa_readw(a) readw((a)) #define isa_readl(a) readl((a)) #define isa_writeb(b,a) writeb(b,(a)) #define isa_writew(w,a) writew(w,(a)) #define isa_writel(l,a) writel(l,(a)) #define isa_memset_io(a,b,c) memset_io((a),(b),(c)) #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c)) #define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c)) static inline int check_signature(unsigned long io_addr, const unsigned char *signature, int length) { int retval = 0; do { if (readb(io_addr) != *signature) goto out; io_addr++; signature++; length--; } while (length); retval = 1; out: return retval; } /** * isa_check_signature - find BIOS signatures * @io_addr: mmio address to check * @signature: signature block * @length: length of signature * * Perform a signature comparison with the ISA mmio address io_addr. * Returns 1 on a match. * * This function is deprecated. New drivers should use ioremap and * check_signature. */ static inline int isa_check_signature(unsigned long io_addr, const unsigned char *signature, int length) { int retval = 0; do { if (isa_readb(io_addr) != *signature) goto out; io_addr++; signature++; length--; } while (length); retval = 1; out: return retval; } #endif /* __KERNEL__ */ #ifdef SLOW_IO_BY_JUMPING #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:" #else #define __SLOW_DOWN_IO "\noutb %%al,$0x80" #endif #ifdef REALLY_SLOW_IO #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO #else #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO #endif /* * Talk about misusing macros.. */ #define __OUT1(s,x) \ static inline void out##s(unsigned x value, unsigned short port) { #define __OUT2(s,s1,s2) \ __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1" #define __OUT(s,s1,x) \ __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \ __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} #define __IN1(s) \ static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v; #define __IN2(s,s1,s2) \ __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0" #define __IN(s,s1,i...) \ __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \ __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } #define __INS(s) \ static inline void ins##s(unsigned short port, void * addr, unsigned long count) \ { __asm__ __volatile__ ("rep ; ins" #s \ : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } #define __OUTS(s) \ static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \ { __asm__ __volatile__ ("rep ; outs" #s \ : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } #define RETURN_TYPE unsigned char __IN(b,"") #undef RETURN_TYPE #define RETURN_TYPE unsigned short __IN(w,"") #undef RETURN_TYPE #define RETURN_TYPE unsigned int __IN(l,"") #undef RETURN_TYPE __OUT(b,"b",char) __OUT(w,"w",short) __OUT(l,,int) __INS(b) __INS(w) __INS(l) __OUTS(b) __OUTS(w) __OUTS(l) static inline void sync(void) { } #endif