1 /*
2 * arch/arm/include/asm/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 #ifndef __ASSEMBLY__
14 #include <asm/barrier.h>
15 #include <asm/thread_info.h>
16 #endif
17
18 /*
19 * Domain numbers
20 *
21 * DOMAIN_IO - domain 2 includes all IO only
22 * DOMAIN_USER - domain 1 includes all user memory only
23 * DOMAIN_KERNEL - domain 0 includes all kernel memory only
24 *
25 * The domain numbering depends on whether we support 36 physical
26 * address for I/O or not. Addresses above the 32 bit boundary can
27 * only be mapped using supersections and supersections can only
28 * be set for domain 0. We could just default to DOMAIN_IO as zero,
29 * but there may be systems with supersection support and no 36-bit
30 * addressing. In such cases, we want to map system memory with
31 * supersections to reduce TLB misses and footprint.
32 *
33 * 36-bit addressing and supersections are only available on
34 * CPUs based on ARMv6+ or the Intel XSC3 core.
35 */
36 #ifndef CONFIG_IO_36
37 #define DOMAIN_KERNEL 0
38 #define DOMAIN_USER 1
39 #define DOMAIN_IO 2
40 #else
41 #define DOMAIN_KERNEL 2
42 #define DOMAIN_USER 1
43 #define DOMAIN_IO 0
44 #endif
45 #define DOMAIN_VECTORS 3
46
47 /*
48 * Domain types
49 */
50 #define DOMAIN_NOACCESS 0
51 #define DOMAIN_CLIENT 1
52 #ifdef CONFIG_CPU_USE_DOMAINS
53 #define DOMAIN_MANAGER 3
54 #else
55 #define DOMAIN_MANAGER 1
56 #endif
57
58 #define domain_mask(dom) ((3) << (2 * (dom)))
59 #define domain_val(dom,type) ((type) << (2 * (dom)))
60
61 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
62 #define DACR_INIT \
63 (domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \
64 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
65 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
66 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
67 #else
68 #define DACR_INIT \
69 (domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \
70 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
71 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
72 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
73 #endif
74
75 #define __DACR_DEFAULT \
76 domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \
77 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
78 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)
79
80 #define DACR_UACCESS_DISABLE \
81 (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
82 #define DACR_UACCESS_ENABLE \
83 (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_CLIENT))
84
85 #ifndef __ASSEMBLY__
86
get_domain(void)87 static inline unsigned int get_domain(void)
88 {
89 unsigned int domain;
90
91 asm(
92 "mrc p15, 0, %0, c3, c0 @ get domain"
93 : "=r" (domain)
94 : "m" (current_thread_info()->cpu_domain));
95
96 return domain;
97 }
98
set_domain(unsigned val)99 static inline void set_domain(unsigned val)
100 {
101 asm volatile(
102 "mcr p15, 0, %0, c3, c0 @ set domain"
103 : : "r" (val) : "memory");
104 isb();
105 }
106
107 #ifdef CONFIG_CPU_USE_DOMAINS
108 #define modify_domain(dom,type) \
109 do { \
110 unsigned int domain = get_domain(); \
111 domain &= ~domain_mask(dom); \
112 domain = domain | domain_val(dom, type); \
113 set_domain(domain); \
114 } while (0)
115
116 #else
modify_domain(unsigned dom,unsigned type)117 static inline void modify_domain(unsigned dom, unsigned type) { }
118 #endif
119
120 /*
121 * Generate the T (user) versions of the LDR/STR and related
122 * instructions (inline assembly)
123 */
124 #ifdef CONFIG_CPU_USE_DOMAINS
125 #define TUSER(instr) #instr "t"
126 #else
127 #define TUSER(instr) #instr
128 #endif
129
130 #else /* __ASSEMBLY__ */
131
132 /*
133 * Generate the T (user) versions of the LDR/STR and related
134 * instructions
135 */
136 #ifdef CONFIG_CPU_USE_DOMAINS
137 #define TUSER(instr) instr ## t
138 #else
139 #define TUSER(instr) instr
140 #endif
141
142 #endif /* __ASSEMBLY__ */
143
144 #endif /* !__ASM_PROC_DOMAIN_H */
145