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 */
110