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x86_io.c
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x86_io.c
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/*
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <gpxe/io.h>
#include <gpxe/x86_io.h>
/** @file
*
* gPXE I/O API for x86
*
*/
/**
* Read 64-bit qword from memory-mapped device
*
* @v io_addr I/O address
* @ret data Value read
*
* This routine uses MMX instructions.
*/
static uint64_t x86_readq ( volatile uint64_t *io_addr ) {
uint64_t data;
__asm__ __volatile__ ( "pushl %%edx\n\t"
"pushl %%eax\n\t"
"movq (%1), %%mm0\n\t"
"movq %%mm0, (%%esp)\n\t"
"popl %%eax\n\t"
"popl %%edx\n\t"
"emms\n\t"
: "=A" ( data ) : "r" ( io_addr ) );
return data;
}
/**
* Write 64-bit qword to memory-mapped device
*
* @v data Value to write
* @v io_addr I/O address
*
* This routine uses MMX instructions.
*/
static void x86_writeq ( uint64_t data, volatile uint64_t *io_addr ) {
__asm__ __volatile__ ( "pushl %%edx\n\t"
"pushl %%eax\n\t"
"movq (%%esp), %%mm0\n\t"
"movq %%mm0, (%1)\n\t"
"popl %%eax\n\t"
"popl %%edx\n\t"
"emms\n\t"
: : "A" ( data ), "r" ( io_addr ) );
}
PROVIDE_IOAPI_INLINE ( x86, phys_to_bus );
PROVIDE_IOAPI_INLINE ( x86, bus_to_phys );
PROVIDE_IOAPI_INLINE ( x86, ioremap );
PROVIDE_IOAPI_INLINE ( x86, iounmap );
PROVIDE_IOAPI_INLINE ( x86, io_to_bus );
PROVIDE_IOAPI_INLINE ( x86, readb );
PROVIDE_IOAPI_INLINE ( x86, readw );
PROVIDE_IOAPI_INLINE ( x86, readl );
PROVIDE_IOAPI ( x86, readq, x86_readq );
PROVIDE_IOAPI_INLINE ( x86, writeb );
PROVIDE_IOAPI_INLINE ( x86, writew );
PROVIDE_IOAPI_INLINE ( x86, writel );
PROVIDE_IOAPI ( x86, writeq, x86_writeq );
PROVIDE_IOAPI_INLINE ( x86, inb );
PROVIDE_IOAPI_INLINE ( x86, inw );
PROVIDE_IOAPI_INLINE ( x86, inl );
PROVIDE_IOAPI_INLINE ( x86, outb );
PROVIDE_IOAPI_INLINE ( x86, outw );
PROVIDE_IOAPI_INLINE ( x86, outl );
PROVIDE_IOAPI_INLINE ( x86, insb );
PROVIDE_IOAPI_INLINE ( x86, insw );
PROVIDE_IOAPI_INLINE ( x86, insl );
PROVIDE_IOAPI_INLINE ( x86, outsb );
PROVIDE_IOAPI_INLINE ( x86, outsw );
PROVIDE_IOAPI_INLINE ( x86, outsl );
PROVIDE_IOAPI_INLINE ( x86, iodelay );
PROVIDE_IOAPI_INLINE ( x86, mb );