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#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

/*

 * Change virtual addresses to physical addresses and vv.

 * These are trivial on the 1:1 Linux/i386 mapping (but if we ever

 * make the kernel segment mapped at 0, we need to do translation

 * on the i386 as well)

 */

extern inline unsigned long virt_to_phys(volatile void * address)

{

        return (unsigned long) address;

}

extern inline void * phys_to_virt(unsigned long address)

{

        return (void *) address;

}

/*

 * 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 *) (addr))

#define readw(addr) (*(volatile unsigned short *) (addr))

#define readl(addr) (*(volatile unsigned int *) (addr))

#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 memset_io(a,b,c)        memset((void *)(a),(b),(c))

#define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))

#define memcpy_toio(a,b,c)      memcpy((void *)(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),(void *)(b),(c),(d))

/*

 * 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 a 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))

#endif