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
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.
30 */
31#ifndef CONFIG_IO_36
32#define DOMAIN_KERNEL	0
33#define DOMAIN_TABLE	0
34#define DOMAIN_USER	1
35#define DOMAIN_IO	2
36#else
37#define DOMAIN_KERNEL	2
38#define DOMAIN_TABLE	2
39#define DOMAIN_USER	1
40#define DOMAIN_IO	0
41#endif
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__
53
54#ifdef CONFIG_MMU
55#define set_domain(x)					\
56	do {						\
57	__asm__ __volatile__(				\
58	"mcr	p15, 0, %0, c3, c0	@ set domain"	\
59	  : : "r" (x));					\
60	isb();						\
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
72#else
73#define set_domain(x)		do { } while (0)
74#define modify_domain(dom,type)	do { } while (0)
75#endif
76
77#endif
78#endif /* !__ASSEMBLY__ */
79