blob: b5dc173d336f93f88d7fa63e0b0c91def5393255 [file] [log] [blame]
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
Catalin Marinas247055a2010-09-13 16:03:21 +010048#ifdef CONFIG_CPU_USE_DOMAINS
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define DOMAIN_MANAGER 3
Catalin Marinas247055a2010-09-13 16:03:21 +010050#else
51#define DOMAIN_MANAGER 1
52#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54#define domain_val(dom,type) ((type) << (2*(dom)))
55
56#ifndef __ASSEMBLY__
Russell King002547b2006-06-20 20:46:52 +010057
Catalin Marinas247055a2010-09-13 16:03:21 +010058#ifdef CONFIG_CPU_USE_DOMAINS
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#define set_domain(x) \
60 do { \
61 __asm__ __volatile__( \
62 "mcr p15, 0, %0, c3, c0 @ set domain" \
63 : : "r" (x)); \
Catalin Marinas620879c2007-02-05 14:47:46 +010064 isb(); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 } while (0)
66
67#define modify_domain(dom,type) \
68 do { \
69 struct thread_info *thread = current_thread_info(); \
70 unsigned int domain = thread->cpu_domain; \
71 domain &= ~domain_val(dom, DOMAIN_MANAGER); \
72 thread->cpu_domain = domain | domain_val(dom, type); \
73 set_domain(thread->cpu_domain); \
74 } while (0)
75
Russell King002547b2006-06-20 20:46:52 +010076#else
77#define set_domain(x) do { } while (0)
78#define modify_domain(dom,type) do { } while (0)
79#endif
80
Catalin Marinas247055a2010-09-13 16:03:21 +010081/*
82 * Generate the T (user) versions of the LDR/STR and related
83 * instructions (inline assembly)
84 */
85#ifdef CONFIG_CPU_USE_DOMAINS
Catalin Marinas4e7682d2012-01-25 11:38:13 +010086#define TUSER(instr) #instr "t"
Catalin Marinas247055a2010-09-13 16:03:21 +010087#else
Catalin Marinas4e7682d2012-01-25 11:38:13 +010088#define TUSER(instr) #instr
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#endif
Catalin Marinas247055a2010-09-13 16:03:21 +010090
91#else /* __ASSEMBLY__ */
92
93/*
94 * Generate the T (user) versions of the LDR/STR and related
95 * instructions
96 */
97#ifdef CONFIG_CPU_USE_DOMAINS
Catalin Marinas4e7682d2012-01-25 11:38:13 +010098#define TUSER(instr) instr ## t
Catalin Marinas247055a2010-09-13 16:03:21 +010099#else
Catalin Marinas4e7682d2012-01-25 11:38:13 +0100100#define TUSER(instr) instr
Catalin Marinas247055a2010-09-13 16:03:21 +0100101#endif
102
103#endif /* __ASSEMBLY__ */
104
105#endif /* !__ASM_PROC_DOMAIN_H */