summaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/domain.h
blob: fc8ba1663601e0743a05b7cda52703df9f9bc07a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
 *  arch/arm/include/asm/domain.h
 *
 *  Copyright (C) 1999 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_PROC_DOMAIN_H
#define __ASM_PROC_DOMAIN_H

#ifndef __ASSEMBLY__
#include <asm/barrier.h>
#include <asm/thread_info.h>
#endif

/*
 * Domain numbers
 *
 *  DOMAIN_IO     - domain 2 includes all IO only
 *  DOMAIN_USER   - domain 1 includes all user memory only
 *  DOMAIN_KERNEL - domain 0 includes all kernel memory only
 *
 * The domain numbering depends on whether we support 36 physical
 * address for I/O or not.  Addresses above the 32 bit boundary can
 * only be mapped using supersections and supersections can only
 * be set for domain 0.  We could just default to DOMAIN_IO as zero,
 * but there may be systems with supersection support and no 36-bit
 * addressing.  In such cases, we want to map system memory with
 * supersections to reduce TLB misses and footprint.
 *
 * 36-bit addressing and supersections are only available on
 * CPUs based on ARMv6+ or the Intel XSC3 core.
 */
#ifndef CONFIG_IO_36
#define DOMAIN_KERNEL	0
#define DOMAIN_USER	1
#define DOMAIN_IO	2
#else
#define DOMAIN_KERNEL	2
#define DOMAIN_USER	1
#define DOMAIN_IO	0
#endif
#define DOMAIN_VECTORS	3

/*
 * Domain types
 */
#define DOMAIN_NOACCESS	0
#define DOMAIN_CLIENT	1
#ifdef CONFIG_CPU_USE_DOMAINS
#define DOMAIN_MANAGER	3
#else
#define DOMAIN_MANAGER	1
#endif

#define domain_mask(dom)	((3) << (2 * (dom)))
#define domain_val(dom,type)	((type) << (2 * (dom)))

#ifdef CONFIG_CPU_SW_DOMAIN_PAN
#define DACR_INIT \
	(domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \
	 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
	 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
	 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
#else
#define DACR_INIT \
	(domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \
	 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
	 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
	 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
#endif

#define __DACR_DEFAULT \
	domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \
	domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
	domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)

#define DACR_UACCESS_DISABLE	\
	(__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
#define DACR_UACCESS_ENABLE	\
	(__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_CLIENT))

#ifndef __ASSEMBLY__

static inline unsigned int get_domain(void)
{
	unsigned int domain;

	asm(
	"mrc	p15, 0, %0, c3, c0	@ get domain"
	 : "=r" (domain)
	 : "m" (current_thread_info()->cpu_domain));

	return domain;
}

static inline void set_domain(unsigned val)
{
	asm volatile(
	"mcr	p15, 0, %0, c3, c0	@ set domain"
	  : : "r" (val) : "memory");
	isb();
}

#ifdef CONFIG_CPU_USE_DOMAINS
#define modify_domain(dom,type)					\
	do {							\
		unsigned int domain = get_domain();		\
		domain &= ~domain_mask(dom);			\
		domain = domain | domain_val(dom, type);	\
		set_domain(domain);				\
	} while (0)

#else
static inline void modify_domain(unsigned dom, unsigned type)	{ }
#endif

/*
 * Generate the T (user) versions of the LDR/STR and related
 * instructions (inline assembly)
 */
#ifdef CONFIG_CPU_USE_DOMAINS
#define TUSER(instr)	#instr "t"
#else
#define TUSER(instr)	#instr
#endif

#else /* __ASSEMBLY__ */

/*
 * Generate the T (user) versions of the LDR/STR and related
 * instructions
 */
#ifdef CONFIG_CPU_USE_DOMAINS
#define TUSER(instr)	instr ## t
#else
#define TUSER(instr)	instr
#endif

#endif /* __ASSEMBLY__ */

#endif /* !__ASM_PROC_DOMAIN_H */
OpenPOWER on IntegriCloud