1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * arch/arm/include/asm/domain.h
4 *
5 * Copyright (C) 1999 Russell King.
6 */
7 #ifndef __ASM_PROC_DOMAIN_H
8 #define __ASM_PROC_DOMAIN_H
9
10 #ifndef __ASSEMBLY__
11 #include <linux/thread_info.h>
12 #include <asm/barrier.h>
13 #endif
14
15 /*
16 * Domain numbers
17 *
18 * DOMAIN_IO - domain 2 includes all IO only
19 * DOMAIN_USER - domain 1 includes all user memory only
20 * DOMAIN_KERNEL - domain 0 includes all kernel memory only
21 *
22 * The domain numbering depends on whether we support 36 physical
23 * address for I/O or not. Addresses above the 32 bit boundary can
24 * only be mapped using supersections and supersections can only
25 * be set for domain 0. We could just default to DOMAIN_IO as zero,
26 * but there may be systems with supersection support and no 36-bit
27 * addressing. In such cases, we want to map system memory with
28 * supersections to reduce TLB misses and footprint.
29 *
30 * 36-bit addressing and supersections are only available on
31 * CPUs based on ARMv6+ or the Intel XSC3 core.
32 */
33 #ifndef CONFIG_IO_36
34 #define DOMAIN_KERNEL 0
35 #define DOMAIN_USER 1
36 #define DOMAIN_IO 2
37 #else
38 #define DOMAIN_KERNEL 2
39 #define DOMAIN_USER 1
40 #define DOMAIN_IO 0
41 #endif
42 #define DOMAIN_VECTORS 3
43
44 /*
45 * Domain types
46 */
47 #define DOMAIN_NOACCESS 0
48 #define DOMAIN_CLIENT 1
49 #ifdef CONFIG_CPU_USE_DOMAINS
50 #define DOMAIN_MANAGER 3
51 #else
52 #define DOMAIN_MANAGER 1
53 #endif
54
55 #define domain_mask(dom) ((3) << (2 * (dom)))
56 #define domain_val(dom,type) ((type) << (2 * (dom)))
57
58 #ifdef CONFIG_CPU_SW_DOMAIN_PAN
59 #define DACR_INIT \
60 (domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \
61 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
62 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
63 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
64 #else
65 #define DACR_INIT \
66 (domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \
67 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
68 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
69 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
70 #endif
71
72 #define __DACR_DEFAULT \
73 domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \
74 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
75 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)
76
77 #define DACR_UACCESS_DISABLE \
78 (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
79 #define DACR_UACCESS_ENABLE \
80 (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_CLIENT))
81
82 #ifndef __ASSEMBLY__
83
84 #ifdef CONFIG_CPU_CP15_MMU
85 static __always_inline unsigned int get_domain(void)
86 {
87 unsigned int domain;
88
89 asm(
90 "mrc p15, 0, %0, c3, c0 @ get domain"
91 : "=r" (domain)
92 : "m" (current_thread_info()->cpu_domain));
93
94 return domain;
95 }
96
97 static __always_inline void set_domain(unsigned int val)
98 {
99 asm volatile(
100 "mcr p15, 0, %0, c3, c0 @ set domain"
101 : : "r" (val) : "memory");
102 isb();
103 }
104 #else
105 static __always_inline unsigned int get_domain(void)
106 {
107 return 0;
108 }
109
110 static __always_inline void set_domain(unsigned int val)
111 {
112 }
113 #endif
114
115 /*
116 * Generate the T (user) versions of the LDR/STR and related
117 * instructions (inline assembly)
118 */
119 #ifdef CONFIG_CPU_USE_DOMAINS
120 #define TUSER(instr) TUSERCOND(instr, )
121 #define TUSERCOND(instr, cond) #instr "t" #cond
122 #else
123 #define TUSER(instr) TUSERCOND(instr, )
124 #define TUSERCOND(instr, cond) #instr #cond
125 #endif
126
127 #else /* __ASSEMBLY__ */
128
129 /*
130 * Generate the T (user) versions of the LDR/STR and related
131 * instructions
132 */
133 #ifdef CONFIG_CPU_USE_DOMAINS
134 #define TUSER(instr) instr ## t
135 #else
136 #define TUSER(instr) instr
137 #endif
138
139 #endif /* __ASSEMBLY__ */
140
141 #endif /* !__ASM_PROC_DOMAIN_H */
142
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.