#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 */ #ifdef SLOW_IO_BY_JUMPING #define __SLOW_DOWN_IO __asm__ __volatile__("jmp 1f\n1:\tjmp 1f\n1:") #else #define __SLOW_DOWN_IO __asm__ __volatile__("outb %al,$0x80") #endif #ifdef REALLY_SLOW_IO #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; } #else #define SLOW_DOWN_IO __SLOW_DOWN_IO #endif /* * Talk about misusing macros.. */ #define __OUT1(s,x) \ extern 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), "d" (port)); } \ __OUT1(s##c,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); } \ __OUT1(s##_p,x) __OUT2(s,s1,"w") : : "a" (value), "d" (port)); SLOW_DOWN_IO; } \ __OUT1(s##c_p,x) __OUT2(s,s1,"") : : "a" (value), "id" (port)); SLOW_DOWN_IO; } #define __IN1(s) \ extern 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) : "d" (port) ,##i ); return _v; } \ __IN1(s##c) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); return _v; } \ __IN1(s##_p) __IN2(s,s1,"w") : "=a" (_v) : "d" (port) ,##i ); SLOW_DOWN_IO; return _v; } \ __IN1(s##c_p) __IN2(s,s1,"") : "=a" (_v) : "id" (port) ,##i ); SLOW_DOWN_IO; return _v; } #define __INS(s) \ extern inline void ins##s(unsigned short port, void * addr, unsigned long count) \ { __asm__ __volatile__ ("cld ; rep ; ins" #s \ : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } #define __OUTS(s) \ extern inline void outs##s(unsigned short port, const void * addr, unsigned long count) \ { __asm__ __volatile__ ("cld ; rep ; outs" #s \ : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); } #define RETURN_TYPE unsigned char /* __IN(b,"b","0" (0)) */ __IN(b,"") #undef RETURN_TYPE #define RETURN_TYPE unsigned short /* __IN(w,"w","0" (0)) */ __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) /* * Note that due to the way __builtin_constant_p() works, you * - can't use it inside an inline function (it will never be true) * - you don't have to worry about side effects within the __builtin.. */ #define outb(val,port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __outbc((val),(port)) : \ __outb((val),(port))) #define inb(port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __inbc(port) : \ __inb(port)) #define outb_p(val,port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __outbc_p((val),(port)) : \ __outb_p((val),(port))) #define inb_p(port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __inbc_p(port) : \ __inb_p(port)) #define outw(val,port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __outwc((val),(port)) : \ __outw((val),(port))) #define inw(port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __inwc(port) : \ __inw(port)) #define outw_p(val,port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __outwc_p((val),(port)) : \ __outw_p((val),(port))) #define inw_p(port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __inwc_p(port) : \ __inw_p(port)) #define outl(val,port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __outlc((val),(port)) : \ __outl((val),(port))) #define inl(port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __inlc(port) : \ __inl(port)) #define outl_p(val,port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __outlc_p((val),(port)) : \ __outl_p((val),(port))) #define inl_p(port) \ ((__builtin_constant_p((port)) && (port) < 256) ? \ __inlc_p(port) : \ __inl_p(port)) #ifdef __KERNEL__ #include <asm/page.h> #define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x))) #define __io_phys(x) ((unsigned long)(x) & ~PAGE_OFFSET) /* * Change virtual addresses to physical addresses and vv. * These are pretty trivial */ extern inline unsigned long virt_to_phys(volatile void * address) { return __io_phys(address); } extern inline void * phys_to_virt(unsigned long address) { return __io_virt(address); } extern void * ioremap(unsigned long offset, unsigned long size); extern void iounmap(void *addr); /* * IO bus memory addresses are also 1:1 with the physical address */ #define virt_to_bus virt_to_phys #define bus_to_virt phys_to_virt /* * 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 *) __io_virt(addr)) #define readw(addr) (*(volatile unsigned short *) __io_virt(addr)) #define readl(addr) (*(volatile unsigned int *) __io_virt(addr)) #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b)) #define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b)) #define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b)) #define memset_io(a,b,c) memset(__io_virt(a),(b),(c)) #define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c)) #define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c)) /* * Again, i386 does not require mem IO specific function. */ #define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),__io_virt(b),(c),(d)) 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; } #endif /* __KERNEL__ */ #endif