[linux-2.6-block.git] / include / asm-arm / domain.h

/*
 *  linux/include/asm-arm/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_USER   - domain 1 includes all user memory only
 *  DOMAIN_KERNEL - domain 0 includes all kernel memory only
 *
 * The domain numbering depends on whether we support 36 physical
 * address for I/O or not.  Addresses above the 32 bit boundary can
 * only be mapped using supersections and supersections can only
 * be set for domain 0.  We could just default to DOMAIN_IO as zero,
 * but there may be systems with supersection support and no 36-bit
 * addressing.  In such cases, we want to map system memory with
 * supersections to reduce TLB misses and footprint.
 *
 * 36-bit addressing and supersections are only available on
 * CPUs based on ARMv6+ or the Intel XSC3 core.
 */
#ifndef CONFIG_IO_36
#define DOMAIN_KERNEL	0
#define DOMAIN_TABLE	0
#define DOMAIN_USER	1
#define DOMAIN_IO	2
#else
#define DOMAIN_KERNEL	2
#define DOMAIN_TABLE	2
#define DOMAIN_USER	1
#define DOMAIN_IO	0
#endif

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

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

#ifndef __ASSEMBLY__

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

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

#else
#define set_domain(x)		do { } while (0)
#define modify_domain(dom,type)	do { } while (0)
#endif

#endif
#endif /* !__ASSEMBLY__ */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/asm-arm/domain.h
	3	*
	4	* Copyright (C) 1999 Russell King.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10	#ifndef __ASM_PROC_DOMAIN_H
	11	#define __ASM_PROC_DOMAIN_H
	12
	13	/*
	14	* Domain numbers
	15	*
	16	* DOMAIN_IO - domain 2 includes all IO only
	17	* DOMAIN_USER - domain 1 includes all user memory only
	18	* DOMAIN_KERNEL - domain 0 includes all kernel memory only
23bdf86a LB	19	*
	20	* The domain numbering depends on whether we support 36 physical
	21	* address for I/O or not. Addresses above the 32 bit boundary can
	22	* only be mapped using supersections and supersections can only
	23	* be set for domain 0. We could just default to DOMAIN_IO as zero,
	24	* but there may be systems with supersection support and no 36-bit
	25	* addressing. In such cases, we want to map system memory with
	26	* supersections to reduce TLB misses and footprint.
	27	*
	28	* 36-bit addressing and supersections are only available on
	29	* CPUs based on ARMv6+ or the Intel XSC3 core.
1da177e4	30	*/
23bdf86a	31	#ifndef CONFIG_IO_36
1da177e4 LT	32	#define DOMAIN_KERNEL 0
	33	#define DOMAIN_TABLE 0
	34	#define DOMAIN_USER 1
	35	#define DOMAIN_IO 2
23bdf86a LB	36	#else
	37	#define DOMAIN_KERNEL 2
	38	#define DOMAIN_TABLE 2
	39	#define DOMAIN_USER 1
	40	#define DOMAIN_IO 0
	41	#endif
1da177e4 LT	42
	43	/*
	44	* Domain types
	45	*/
	46	#define DOMAIN_NOACCESS 0
	47	#define DOMAIN_CLIENT 1
	48	#define DOMAIN_MANAGER 3
	49
	50	#define domain_val(dom,type) ((type) << (2*(dom)))
	51
	52	#ifndef __ASSEMBLY__
002547b4 RK	53
002547b4 RK	54	#ifdef CONFIG_MMU
1da177e4 LT	55	#define set_domain(x) \
	56	do { \
	57	__asm__ __volatile__( \
	58	"mcr p15, 0, %0, c3, c0 @ set domain" \
	59	: : "r" (x)); \
620879c9	60	isb(); \
1da177e4 LT	61	} while (0)
	62
	63	#define modify_domain(dom,type) \
	64	do { \
	65	struct thread_info *thread = current_thread_info(); \
	66	unsigned int domain = thread->cpu_domain; \
	67	domain &= ~domain_val(dom, DOMAIN_MANAGER); \
	68	thread->cpu_domain = domain \| domain_val(dom, type); \
	69	set_domain(thread->cpu_domain); \
	70	} while (0)
	71
002547b4 RK	72	#else
	73	#define set_domain(x) do { } while (0)
	74	#define modify_domain(dom,type) do { } while (0)
	75	#endif
	76
1da177e4 LT	77	#endif
1da177e4 LT	78	#endif /* !__ASSEMBLY__ */