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Linux kernel mirror (for testing)
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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
87static 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
99static 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
117static 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 */