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
40 #define DOMAIN_KERNEL 2
44 #define DOMAIN_VECTORS 3
49 #define DOMAIN_NOACCESS 0
50 #define DOMAIN_CLIENT 1
51 #ifdef CONFIG_CPU_USE_DOMAINS
52 #define DOMAIN_MANAGER 3
54 #define DOMAIN_MANAGER 1
57 #define domain_mask(dom) ((3) << (2 * (dom)))
58 #define domain_val(dom,type) ((type) << (2 * (dom)))
60 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
62 (domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \
63 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
64 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
65 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
68 (domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \
69 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
70 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
71 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
74 #define __DACR_DEFAULT \
75 domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \
76 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
77 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)
79 #define DACR_UACCESS_DISABLE \
80 (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
81 #define DACR_UACCESS_ENABLE \
82 (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_CLIENT))
86 static inline unsigned int get_domain(void)
91 "mrc p15, 0, %0, c3, c0 @ get domain"
97 static inline void set_domain(unsigned val)
100 "mcr p15, 0, %0, c3, c0 @ set domain"
105 #ifdef CONFIG_CPU_USE_DOMAINS
106 #define modify_domain(dom,type) \
108 unsigned int domain = get_domain(); \
109 domain &= ~domain_mask(dom); \
110 domain = domain | domain_val(dom, type); \
111 set_domain(domain); \
115 static inline void modify_domain(unsigned dom, unsigned type) { }
119 * Generate the T (user) versions of the LDR/STR and related
120 * instructions (inline assembly)
122 #ifdef CONFIG_CPU_USE_DOMAINS
123 #define TUSER(instr) #instr "t"
125 #define TUSER(instr) #instr
128 #else /* __ASSEMBLY__ */
131 * Generate the T (user) versions of the LDR/STR and related
134 #ifdef CONFIG_CPU_USE_DOMAINS
135 #define TUSER(instr) instr ## t
137 #define TUSER(instr) instr
140 #endif /* __ASSEMBLY__ */
142 #endif /* !__ASM_PROC_DOMAIN_H */