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 88 static 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 } 99 100 static 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 108 static inline unsigned int get_domain(void) 109 { 110 return 0; 111 } 112 113 static 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 128 static 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 */ 156