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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Russell King4baa9922008-08-02 10:55:55 +01002 * arch/arm/include/asm/domain.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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
Lennert Buytenhek23bdf862006-03-28 21:00:40 +010019 *
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 */
Lennert Buytenhek23bdf862006-03-28 21:00:40 +010031#ifndef CONFIG_IO_36
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#define DOMAIN_KERNEL 0
33#define DOMAIN_TABLE 0
34#define DOMAIN_USER 1
35#define DOMAIN_IO 2
Lennert Buytenhek23bdf862006-03-28 21:00:40 +010036#else
37#define DOMAIN_KERNEL 2
38#define DOMAIN_TABLE 2
39#define DOMAIN_USER 1
40#define DOMAIN_IO 0
41#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
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__
Russell King002547b2006-06-20 20:46:52 +010053
54#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#define set_domain(x) \
56 do { \
57 __asm__ __volatile__( \
58 "mcr p15, 0, %0, c3, c0 @ set domain" \
59 : : "r" (x)); \
Catalin Marinas620879c2007-02-05 14:47:46 +010060 isb(); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 } 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
Russell King002547b2006-06-20 20:46:52 +010072#else
73#define set_domain(x) do { } while (0)
74#define modify_domain(dom,type) do { } while (0)
75#endif
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#endif
78#endif /* !__ASSEMBLY__ */