gpxe/src/arch/i386/core/x86_io.c

/*
 * 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 );