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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 <asm/barrier.h>
12#include <asm/thread_info.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
85static __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
97static __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
105static __always_inline unsigned int get_domain(void)
106{
107 return 0;
108}
109
110static __always_inline void set_domain(unsigned int val)
111{
112}
113#endif
114
115#ifdef CONFIG_CPU_USE_DOMAINS
116#define modify_domain(dom,type) \
117 do { \
118 unsigned int domain = get_domain(); \
119 domain &= ~domain_mask(dom); \
120 domain = domain | domain_val(dom, type); \
121 set_domain(domain); \
122 } while (0)
123
124#else
125static inline void modify_domain(unsigned dom, unsigned type) { }
126#endif
127
128/*
129 * Generate the T (user) versions of the LDR/STR and related
130 * instructions (inline assembly)
131 */
132#ifdef CONFIG_CPU_USE_DOMAINS
133#define TUSER(instr) TUSERCOND(instr, )
134#define TUSERCOND(instr, cond) #instr "t" #cond
135#else
136#define TUSER(instr) TUSERCOND(instr, )
137#define TUSERCOND(instr, cond) #instr #cond
138#endif
139
140#else /* __ASSEMBLY__ */
141
142/*
143 * Generate the T (user) versions of the LDR/STR and related
144 * instructions
145 */
146#ifdef CONFIG_CPU_USE_DOMAINS
147#define TUSER(instr) instr ## t
148#else
149#define TUSER(instr) instr
150#endif
151
152#endif /* __ASSEMBLY__ */
153
154#endif /* !__ASM_PROC_DOMAIN_H */
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#endif
16
17/*
18 * Domain numbers
19 *
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
23 *
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.
31 *
32 * 36-bit addressing and supersections are only available on
33 * CPUs based on ARMv6+ or the Intel XSC3 core.
34 */
35#ifndef CONFIG_IO_36
36#define DOMAIN_KERNEL 0
37#define DOMAIN_TABLE 0
38#define DOMAIN_USER 1
39#define DOMAIN_IO 2
40#else
41#define DOMAIN_KERNEL 2
42#define DOMAIN_TABLE 2
43#define DOMAIN_USER 1
44#define DOMAIN_IO 0
45#endif
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_val(dom,type) ((type) << (2*(dom)))
59
60#ifndef __ASSEMBLY__
61
62#ifdef CONFIG_CPU_USE_DOMAINS
63static inline void set_domain(unsigned val)
64{
65 asm volatile(
66 "mcr p15, 0, %0, c3, c0 @ set domain"
67 : : "r" (val));
68 isb();
69}
70
71#define modify_domain(dom,type) \
72 do { \
73 struct thread_info *thread = current_thread_info(); \
74 unsigned int domain = thread->cpu_domain; \
75 domain &= ~domain_val(dom, DOMAIN_MANAGER); \
76 thread->cpu_domain = domain | domain_val(dom, type); \
77 set_domain(thread->cpu_domain); \
78 } while (0)
79
80#else
81static inline void set_domain(unsigned val) { }
82static inline void modify_domain(unsigned dom, unsigned type) { }
83#endif
84
85/*
86 * Generate the T (user) versions of the LDR/STR and related
87 * instructions (inline assembly)
88 */
89#ifdef CONFIG_CPU_USE_DOMAINS
90#define TUSER(instr) #instr "t"
91#else
92#define TUSER(instr) #instr
93#endif
94
95#else /* __ASSEMBLY__ */
96
97/*
98 * Generate the T (user) versions of the LDR/STR and related
99 * instructions
100 */
101#ifdef CONFIG_CPU_USE_DOMAINS
102#define TUSER(instr) instr ## t
103#else
104#define TUSER(instr) instr
105#endif
106
107#endif /* __ASSEMBLY__ */
108
109#endif /* !__ASM_PROC_DOMAIN_H */