2 * arch/arm/include/asm/domain.h
4 * Copyright (C) 1999 Russell King.
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.
10 #ifndef __ASM_PROC_DOMAIN_H
11 #define __ASM_PROC_DOMAIN_H
14 #include <asm/barrier.h>
20 * DOMAIN_IO - domain 2 includes all IO only
21 * DOMAIN_USER - domain 1 includes all user memory only
22 * DOMAIN_KERNEL - domain 0 includes all kernel memory only
24 * The domain numbering depends on whether we support 36 physical
25 * address for I/O or not. Addresses above the 32 bit boundary can
26 * only be mapped using supersections and supersections can only
27 * be set for domain 0. We could just default to DOMAIN_IO as zero,
28 * but there may be systems with supersection support and no 36-bit
29 * addressing. In such cases, we want to map system memory with
30 * supersections to reduce TLB misses and footprint.
32 * 36-bit addressing and supersections are only available on
33 * CPUs based on ARMv6+ or the Intel XSC3 core.
36 #define DOMAIN_KERNEL 0
37 #define DOMAIN_TABLE 0
41 #define DOMAIN_KERNEL 2
42 #define DOMAIN_TABLE 2
50 #define DOMAIN_NOACCESS 0
51 #define DOMAIN_CLIENT 1
52 #ifdef CONFIG_CPU_USE_DOMAINS
53 #define DOMAIN_MANAGER 3
55 #define DOMAIN_MANAGER 1
58 #define domain_val(dom,type) ((type) << (2*(dom)))
62 static inline unsigned int get_domain(void)
67 "mrc p15, 0, %0, c3, c0 @ get domain"
73 #ifdef CONFIG_CPU_USE_DOMAINS
74 static inline void set_domain(unsigned val)
77 "mcr p15, 0, %0, c3, c0 @ set domain"
82 #define modify_domain(dom,type) \
84 unsigned int domain = get_domain(); \
85 domain &= ~domain_val(dom, DOMAIN_MANAGER); \
86 domain = domain | domain_val(dom, type); \
91 static inline void set_domain(unsigned val) { }
92 static inline void modify_domain(unsigned dom, unsigned type) { }
96 * Generate the T (user) versions of the LDR/STR and related
97 * instructions (inline assembly)
99 #ifdef CONFIG_CPU_USE_DOMAINS
100 #define TUSER(instr) #instr "t"
102 #define TUSER(instr) #instr
105 #else /* __ASSEMBLY__ */
108 * Generate the T (user) versions of the LDR/STR and related
111 #ifdef CONFIG_CPU_USE_DOMAINS
112 #define TUSER(instr) instr ## t
114 #define TUSER(instr) instr
117 #endif /* __ASSEMBLY__ */
119 #endif /* !__ASM_PROC_DOMAIN_H */