bus.h

基于组件方式开发操作系统的OSKIT源代码

/*	$NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $	*/

/*-
 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Copyright (c) 1996 Charles M. Hannum.  All rights reserved.
 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *	for the NetBSD Project.
 * 4. 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.
 */
/* $Id: bus.h,v 1.4 1998/09/29 09:06:00 bde Exp $ */

#ifndef _I386_BUS_H_
#define _I386_BUS_H_

#include <machine/cpufunc.h>

/*
 * Values for the i386 bus space tag, not to be used directly by MI code.
 */
#define	I386_BUS_SPACE_IO	0	/* space is i/o space */
#define I386_BUS_SPACE_MEM	1	/* space is mem space */

/*
 * Bus address and size types
 */
typedef u_int bus_addr_t;
typedef u_int bus_size_t;

#define BUS_SPACE_MAXSIZE_24BIT	0xFFFFFF
#define BUS_SPACE_MAXSIZE_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXSIZE	(64 * 1024) /* Maximum supported size */
#define BUS_SPACE_MAXADDR_24BIT	0xFFFFFF
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXADDR	0xFFFFFFFF

#define BUS_SPACE_UNRESTRICTED	(~0)

/*
 * Access methods for bus resources and address space.
 */
typedef	int bus_space_tag_t;
typedef	u_int bus_space_handle_t;

/*
 * Map a region of device bus space into CPU virtual address space.
 */

#define	BUS_SPACE_MAP_CACHEABLE		0x01
#define	BUS_SPACE_MAP_LINEAR		0x02

int	bus_space_map(bus_space_tag_t t, bus_addr_t addr, bus_size_t size,
		      int flags, bus_space_handle_t *bshp);

/*
 * Unmap a region of device bus space.
 */

void	bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh,
			bus_size_t size);

/*
 * Get a new handle for a subregion of an already-mapped area of bus space.
 */

int	bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
			    bus_size_t offset, bus_size_t size,
			    bus_space_handle_t *nbshp);

/*
 * Allocate a region of memory that is accessible to devices in bus space.
 */

int	bus_space_alloc(bus_space_tag_t t, bus_addr_t rstart,
			bus_addr_t rend, bus_size_t size, bus_size_t align,
			bus_size_t boundary, int flags, bus_addr_t *addrp,
			bus_space_handle_t *bshp);

/*
 * Free a region of bus space accessible memory.
 */

void	bus_space_free(bus_space_tag_t t, bus_space_handle_t bsh,
		       bus_size_t size);

#if defined(_I386_BUS_PIO_H_) || defined(_I386_BUS_MEMIO_H_)

/*
 * Read a 1, 2, 4, or 8 byte quantity from bus space
 * described by tag/handle/offset.
 */
static __inline u_int8_t bus_space_read_1(bus_space_tag_t tag,
					  bus_space_handle_t handle,
					  bus_size_t offset);

static __inline u_int16_t bus_space_read_2(bus_space_tag_t tag,
					   bus_space_handle_t handle,
					   bus_size_t offset);

static __inline u_int32_t bus_space_read_4(bus_space_tag_t tag,
					   bus_space_handle_t handle,
					   bus_size_t offset);

static __inline u_int8_t
bus_space_read_1(bus_space_tag_t tag, bus_space_handle_t handle,
		 bus_size_t offset)
{
#if defined (_I386_BUS_PIO_H_)
#if defined (_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
		return (inb(handle + offset));
#endif
#if defined (_I386_BUS_MEMIO_H_)
	return (*(volatile u_int8_t *)(handle + offset));
#endif
}

static __inline u_int16_t
bus_space_read_2(bus_space_tag_t tag, bus_space_handle_t handle,
		 bus_size_t offset)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
		return (inw(handle + offset));
#endif
#if defined(_I386_BUS_MEMIO_H_)
	return (*(volatile u_int16_t *)(handle + offset));
#endif
}

static __inline u_int32_t
bus_space_read_4(bus_space_tag_t tag, bus_space_handle_t handle,
		 bus_size_t offset)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
		return (inl(handle + offset));
#endif
#if defined(_I386_BUS_MEMIO_H_)
	return (*(volatile u_int32_t *)(handle + offset));
#endif
}

#if 0	/* Cause a link error for bus_space_read_8 */
#define	bus_space_read_8(t, h, o)	!!! bus_space_read_8 unimplemented !!!
#endif

/*
 * Read `count' 1, 2, 4, or 8 byte quantities from bus space
 * described by tag/handle/offset and copy into buffer provided.
 */
static __inline void bus_space_read_multi_1(bus_space_tag_t tag,
					    bus_space_handle_t bsh,
					    bus_size_t offset, u_int8_t *addr,
					    size_t count);

static __inline void bus_space_read_multi_2(bus_space_tag_t tag,
					    bus_space_handle_t bsh,
					    bus_size_t offset, u_int16_t *addr,
					    size_t count);

static __inline void bus_space_read_multi_4(bus_space_tag_t tag,
					    bus_space_handle_t bsh,
					    bus_size_t offset, u_int32_t *addr,
					    size_t count);

static __inline void
bus_space_read_multi_1(bus_space_tag_t tag, bus_space_handle_t bsh,
		       bus_size_t offset, u_int8_t *addr, size_t count)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
		insb(bsh + offset, addr, count);
#endif
#if defined(_I386_BUS_MEMIO_H_)
#if defined(_I386_BUS_PIO_H_)
	else
#endif
	{
		int __x __asm__("%eax");
		__asm __volatile("				\n\
			cld					\n\
		1:	movb (%1),%%al				\n\
			stosb					\n\
			loop 1b"				:
		    "=&a" (__x)					:
		    "r" (bsh + offset), "D" (addr), "c" (count)	:
		    "%edi", "%ecx", "memory");
	}
#endif
}

static __inline void
bus_space_read_multi_2(bus_space_tag_t tag, bus_space_handle_t bsh,
		       bus_size_t offset, u_int16_t *addr, size_t count)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
		insw(bsh + offset, addr, count);
#endif
#if defined(_I386_BUS_MEMIO_H_)
#if defined(_I386_BUS_PIO_H_)
	else
#endif
	{
		int __x __asm__("%eax");
		__asm __volatile("				\n\
			cld					\n\
		1:	movw (%1),%%ax				\n\
			stosw					\n\
			loop 1b"				:
		    "=&a" (__x)					:
		    "r" (bsh + offset), "D" (addr), "c" (count)	:
		    "%edi", "%ecx", "memory");
	}
#endif
}

static __inline void
bus_space_read_multi_4(bus_space_tag_t tag, bus_space_handle_t bsh,
		       bus_size_t offset, u_int32_t *addr, size_t count)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
		insl(bsh + offset, addr, count);
#endif
#if defined(_I386_BUS_MEMIO_H_)
#if defined(_I386_BUS_PIO_H_)
	else
#endif
	{
		int __x __asm__("%eax");
		__asm __volatile("				\n\
			cld					\n\
		1:	movl (%1),%%eax				\n\
			stosl					\n\
			loop 1b"				:
		    "=&a" (__x)					:
		    "r" (bsh + offset), "D" (addr), "c" (count)	:
		    "%edi", "%ecx", "memory");
	}
#endif
}

#if 0	/* Cause a link error for bus_space_read_multi_8 */
#define	bus_space_read_multi_8	!!! bus_space_read_multi_8 unimplemented !!!
#endif

/*
 * Read `count' 1, 2, 4, or 8 byte quantities from bus space
 * described by tag/handle and starting at `offset' and copy into
 * buffer provided.
 */
static __inline void bus_space_read_region_1(bus_space_tag_t tag,
					     bus_space_handle_t bsh,
					     bus_size_t offset, u_int8_t *addr,
					     size_t count);

static __inline void bus_space_read_region_2(bus_space_tag_t tag,
					     bus_space_handle_t bsh,
					     bus_size_t offset, u_int16_t *addr,
					     size_t count);

static __inline void bus_space_read_region_4(bus_space_tag_t tag,
					     bus_space_handle_t bsh,
					     bus_size_t offset, u_int32_t *addr,
					     size_t count);


static __inline void
bus_space_read_region_1(bus_space_tag_t tag, bus_space_handle_t bsh,
			bus_size_t offset, u_int8_t *addr, size_t count)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
	{
		int __x __asm__("%eax");
		__asm __volatile("				\n\
			cld					\n\
		1:	inb %w1,%%al				\n\
			stosb					\n\
			incl %1					\n\
			loop 1b"				:
		    "=&a" (__x)					:
		    "d" (bsh + offset), "D" (addr), "c" (count)	:
		    "%edx", "%edi", "%ecx", "memory");
	}
#endif
#if defined(_I386_BUS_MEMIO_H_)
#if defined(_I386_BUS_PIO_H_)
	else
#endif
	{
		__asm __volatile("				\n\
			cld					\n\
			repne					\n\
			movsb"					:
								:
		    "S" (bsh + offset), "D" (addr), "c" (count)	:
		    "%esi", "%edi", "%ecx", "memory");
	}
#endif
}

static __inline void
bus_space_read_region_2(bus_space_tag_t tag, bus_space_handle_t bsh,
			bus_size_t offset, u_int16_t *addr, size_t count)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
	{
		int __x __asm__("%eax");
		__asm __volatile("				\n\
			cld					\n\
		1:	inw %w1,%%ax				\n\
			stosw					\n\
			addl $2,%1				\n\
			loop 1b"				:
		    "=&a" (__x)					:
		    "d" (bsh + offset), "D" (addr), "c" (count)	:
		    "%edx", "%edi", "%ecx", "memory");
	}
#endif
#if defined(_I386_BUS_MEMIO_H_)
#if defined(_I386_BUS_PIO_H_)
	else
#endif
	{
		__asm __volatile("				\n\
			cld					\n\
			repne					\n\
			movsw"					:
								:
		    "S" (bsh + offset), "D" (addr), "c" (count)	:
		    "%esi", "%edi", "%ecx", "memory");
	}
#endif
}

static __inline void
bus_space_read_region_4(bus_space_tag_t tag, bus_space_handle_t bsh,
			bus_size_t offset, u_int32_t *addr, size_t count)
{
#if defined(_I386_BUS_PIO_H_)
#if defined(_I386_BUS_MEMIO_H_)
	if (tag == I386_BUS_SPACE_IO)
#endif
	{
		int __x __asm__("%eax");
		__asm __volatile("				\n\
			cld					\n\
		1:	inl %w1,%%eax				\n\
			stosl					\n\
			addl $4,%1				\n\