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