tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
87#ifdef CONFIG_CPU_CP15_MMU
88static inline unsigned int get_domain(void)
89{
90 unsigned int domain;
91
92 asm(
93 "mrc p15, 0, %0, c3, c0 @ get domain"
94 : "=r" (domain)
95 : "m" (current_thread_info()->cpu_domain));
96
97 return domain;
98}
99
100static inline void set_domain(unsigned val)
101{
102 asm volatile(
103 "mcr p15, 0, %0, c3, c0 @ set domain"
104 : : "r" (val) : "memory");
105 isb();
106}
107#else
108static inline unsigned int get_domain(void)
109{
110 return 0;
111}
112
113static inline void set_domain(unsigned val)
114{
115}
116#endif
117
118#ifdef CONFIG_CPU_USE_DOMAINS
119#define modify_domain(dom,type) \
120 do { \
121 unsigned int domain = get_domain(); \
122 domain &= ~domain_mask(dom); \
123 domain = domain | domain_val(dom, type); \
124 set_domain(domain); \
125 } while (0)
126
127#else
128static inline void modify_domain(unsigned dom, unsigned type) { }
129#endif
130
131/*
132 * Generate the T (user) versions of the LDR/STR and related
133 * instructions (inline assembly)
134 */
135#ifdef CONFIG_CPU_USE_DOMAINS
136#define TUSER(instr) #instr "t"
137#else
138#define TUSER(instr) #instr
139#endif
140
141#else /* __ASSEMBLY__ */
142
143/*
144 * Generate the T (user) versions of the LDR/STR and related
145 * instructions
146 */
147#ifdef CONFIG_CPU_USE_DOMAINS
148#define TUSER(instr) instr ## t
149#else
150#define TUSER(instr) instr
151#endif
152
153#endif /* __ASSEMBLY__ */
154
155#endif /* !__ASM_PROC_DOMAIN_H */