domain.h

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/*
 *  linux/include/asm-arm/proc-armv/domain.h
 *
 *  Copyright (C) 1999 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_PROC_DOMAIN_H
#define __ASM_PROC_DOMAIN_H

/*
 * Domain numbers
 *
 *  DOMAIN_IO     - domain 2 includes all IO only
 *  DOMAIN_KERNEL - domain 1 includes all kernel memory only
 *  DOMAIN_USER   - domain 0 includes all user memory only
 */
#define DOMAIN_USER	0
#define DOMAIN_KERNEL	1
#define DOMAIN_TABLE	1
#define DOMAIN_IO	2

/*
 * Domain types
 */
#define DOMAIN_NOACCESS	0
#define DOMAIN_CLIENT	1
#define DOMAIN_MANAGER	3

#define domain_val(dom,type)	((type) << 2*(dom))

#define set_domain(x)					\
	do {						\
	__asm__ __volatile__(				\
	"mcr	p15, 0, %0, c3, c0	@ set domain"	\
	  : : "r" (x));					\
	} while (0)

#define modify_domain(dom,type)				\
	do {						\
	unsigned int domain = current->thread.domain;	\
	domain &= ~domain_val(dom, DOMAIN_MANAGER);	\
	domain |= domain_val(dom, type);		\
	current->thread.domain = domain;		\
	set_domain(current->thread.domain);		\
	} while (0)

#endif