Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Russell King | 4baa992 | 2008-08-02 10:55:55 +0100 | [diff] [blame] | 2 | * arch/arm/include/asm/domain.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Howells | 9f97da7 | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 13 | #ifndef __ASSEMBLY__ |
| 14 | #include <asm/barrier.h> |
| 15 | #endif |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | */ |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 35 | #ifndef CONFIG_IO_36 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #define DOMAIN_KERNEL 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #define DOMAIN_USER 1 |
| 38 | #define DOMAIN_IO 2 |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 39 | #else |
| 40 | #define DOMAIN_KERNEL 2 |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 41 | #define DOMAIN_USER 1 |
| 42 | #define DOMAIN_IO 0 |
| 43 | #endif |
Russell King | a02d8df | 2015-08-21 09:38:31 +0100 | [diff] [blame] | 44 | #define DOMAIN_VECTORS 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
| 47 | * Domain types |
| 48 | */ |
| 49 | #define DOMAIN_NOACCESS 0 |
| 50 | #define DOMAIN_CLIENT 1 |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 51 | #ifdef CONFIG_CPU_USE_DOMAINS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #define DOMAIN_MANAGER 3 |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 53 | #else |
| 54 | #define DOMAIN_MANAGER 1 |
| 55 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Russell King | 8e79870 | 2015-08-19 22:36:24 +0100 | [diff] [blame] | 57 | #define domain_mask(dom) ((3) << (2 * (dom))) |
| 58 | #define domain_val(dom,type) ((type) << (2 * (dom))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Russell King | a5e090a | 2015-08-19 20:40:41 +0100 | [diff] [blame] | 60 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
| 61 | #define DACR_INIT \ |
| 62 | (domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \ |
| 63 | domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ |
| 64 | domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \ |
| 65 | domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)) |
| 66 | #else |
Russell King | 0171356 | 2015-08-21 09:23:26 +0100 | [diff] [blame] | 67 | #define DACR_INIT \ |
Russell King | 3c2aed5 | 2015-08-21 09:30:16 +0100 | [diff] [blame] | 68 | (domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \ |
Russell King | 0171356 | 2015-08-21 09:23:26 +0100 | [diff] [blame] | 69 | domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ |
Russell King | a02d8df | 2015-08-21 09:38:31 +0100 | [diff] [blame] | 70 | domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \ |
| 71 | domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)) |
Russell King | a5e090a | 2015-08-19 20:40:41 +0100 | [diff] [blame] | 72 | #endif |
| 73 | |
| 74 | #define __DACR_DEFAULT \ |
| 75 | domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \ |
| 76 | domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \ |
| 77 | domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT) |
| 78 | |
| 79 | #define DACR_UACCESS_DISABLE \ |
| 80 | (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS)) |
| 81 | #define DACR_UACCESS_ENABLE \ |
| 82 | (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_CLIENT)) |
Russell King | 0171356 | 2015-08-21 09:23:26 +0100 | [diff] [blame] | 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #ifndef __ASSEMBLY__ |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 85 | |
Russell King | 1eef5d2 | 2015-08-19 21:23:48 +0100 | [diff] [blame] | 86 | static inline unsigned int get_domain(void) |
| 87 | { |
| 88 | unsigned int domain; |
| 89 | |
| 90 | asm( |
| 91 | "mrc p15, 0, %0, c3, c0 @ get domain" |
| 92 | : "=r" (domain)); |
| 93 | |
| 94 | return domain; |
| 95 | } |
| 96 | |
Russell King | 82401bf | 2012-07-04 17:05:28 +0100 | [diff] [blame] | 97 | static inline void set_domain(unsigned val) |
| 98 | { |
| 99 | asm volatile( |
| 100 | "mcr p15, 0, %0, c3, c0 @ set domain" |
| 101 | : : "r" (val)); |
| 102 | isb(); |
| 103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Russell King | a5e090a | 2015-08-19 20:40:41 +0100 | [diff] [blame] | 105 | #ifdef CONFIG_CPU_USE_DOMAINS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #define modify_domain(dom,type) \ |
| 107 | do { \ |
Russell King | 1eef5d2 | 2015-08-19 21:23:48 +0100 | [diff] [blame] | 108 | unsigned int domain = get_domain(); \ |
Russell King | 8e79870 | 2015-08-19 22:36:24 +0100 | [diff] [blame] | 109 | domain &= ~domain_mask(dom); \ |
Russell King | 1eef5d2 | 2015-08-19 21:23:48 +0100 | [diff] [blame] | 110 | domain = domain | domain_val(dom, type); \ |
| 111 | set_domain(domain); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } while (0) |
| 113 | |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 114 | #else |
Russell King | 82401bf | 2012-07-04 17:05:28 +0100 | [diff] [blame] | 115 | static inline void modify_domain(unsigned dom, unsigned type) { } |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 116 | #endif |
| 117 | |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 118 | /* |
| 119 | * Generate the T (user) versions of the LDR/STR and related |
| 120 | * instructions (inline assembly) |
| 121 | */ |
| 122 | #ifdef CONFIG_CPU_USE_DOMAINS |
Catalin Marinas | 4e7682d | 2012-01-25 11:38:13 +0100 | [diff] [blame] | 123 | #define TUSER(instr) #instr "t" |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 124 | #else |
Catalin Marinas | 4e7682d | 2012-01-25 11:38:13 +0100 | [diff] [blame] | 125 | #define TUSER(instr) #instr |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #endif |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 127 | |
| 128 | #else /* __ASSEMBLY__ */ |
| 129 | |
| 130 | /* |
| 131 | * Generate the T (user) versions of the LDR/STR and related |
| 132 | * instructions |
| 133 | */ |
| 134 | #ifdef CONFIG_CPU_USE_DOMAINS |
Catalin Marinas | 4e7682d | 2012-01-25 11:38:13 +0100 | [diff] [blame] | 135 | #define TUSER(instr) instr ## t |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 136 | #else |
Catalin Marinas | 4e7682d | 2012-01-25 11:38:13 +0100 | [diff] [blame] | 137 | #define TUSER(instr) instr |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 138 | #endif |
| 139 | |
| 140 | #endif /* __ASSEMBLY__ */ |
| 141 | |
| 142 | #endif /* !__ASM_PROC_DOMAIN_H */ |