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asm
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io.h
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2002-04-26
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/* $Id: io.h,v 1.2 2002/04/26 23:09:19 smilcke Exp $ */
#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>
*/
/*
* IO bus memory addresses are also 1:1 with the physical address
*/
#define IO_SPACE_LIMIT 0xffff
#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
#define __io_virt(x) ((void *)(x))
#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 __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#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 __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
/*
* Talk about misusing macros..
*/
#define __OUT1(s,x) \
extern inline void out##s(unsigned x value, unsigned short port) {
#define __IN1(s) \
extern inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
void outb(unsigned char data, int port);
#pragma aux outb = \
"out dx, al" \
parm [al] [dx];
unsigned char inb(int port);
#pragma aux inb = \
"in al,dx" \
parm [dx] \
value [al];
void outw(unsigned short data, int port);
#pragma aux outw = \
"out dx, ax" \
parm [ax] [dx];
unsigned short inw(int port);
#pragma aux inw = \
"in ax,dx" \
parm [dx] \
value [ax];
void outl(unsigned long data, int port);
#pragma aux outl = \
"out dx, eax" \
parm [eax] [dx];
unsigned long inl(int port);
#pragma aux inl = \
"in eax,dx" \
parm [dx] \
value [eax];
#endif