/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @file
 * @ingroup libcia32, libcamd64
 */

#ifndef LIBC_ia32_DDI_H_
#define LIBC_ia32_DDI_H_

#include <sys/types.h>
#include <libarch/types.h>

#define IO_SPACE_BOUNDARY  ((void *) (64 * 1024))

static inline uint8_t pio_read_8(ioport8_t *port)
{
	if (port < (ioport8_t *) IO_SPACE_BOUNDARY) {
		uint8_t val;
		asm volatile (
			"inb %w1, %b0\n"
			: "=a" (val)
			: "d" (port)
		);
		return val;
	} else {
		return (uint8_t) *port;
	}
}

static inline uint16_t pio_read_16(ioport16_t *port)
{
	if (port < (ioport16_t *) IO_SPACE_BOUNDARY) {
		uint16_t val;
		asm volatile (
			"inw %w1, %w0\n"
			: "=a" (val)
			: "d" (port)
		);
		return val;
	} else {
		return (uint16_t) *port;
	}
}

static inline uint32_t pio_read_32(ioport32_t *port)
{
	if (port < (ioport32_t *) IO_SPACE_BOUNDARY) {
		uint32_t val;
		asm volatile (
			"inl %w1, %0\n"
			: "=a" (val)
			: "d" (port)
		);
		return val;
	} else {
		return (uint32_t) *port;
	}
}

static inline void pio_write_8(ioport8_t *port, uint8_t val)
{
	if (port < (ioport8_t *) IO_SPACE_BOUNDARY) {
		asm volatile (
			"outb %b0, %w1\n"
			:: "a" (val), "d" (port)
		);	
	} else {
		*port = val;
	}
}

static inline void pio_write_16(ioport16_t *port, uint16_t val)
{
	if (port < (ioport16_t *) IO_SPACE_BOUNDARY) {
		asm volatile (
			"outw %w0, %w1\n"
			:: "a" (val), "d" (port)
		);
	} else {
		*port = val;
	}
}

static inline void pio_write_32(ioport32_t *port, uint32_t val)
{
	if (port < (ioport32_t *) IO_SPACE_BOUNDARY) {
		asm volatile (
			"outl %0, %w1\n"
			:: "a" (val), "d" (port)
		);
	} else {
		*port = val;
	}
}

#endif
