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_USER 1 38 #define DOMAIN_IO 2 39 #else 40 #define DOMAIN_KERNEL 2 41 #define DOMAIN_USER 1 42 #define DOMAIN_IO 0 43 #endif 44 #define DOMAIN_VECTORS 3 45 46 /* 47 * Domain types 48 */ 49 #define DOMAIN_NOACCESS 0 50 #define DOMAIN_CLIENT 1 51 #ifdef CONFIG_CPU_USE_DOMAINS 52 #define DOMAIN_MANAGER 3 53 #else 54 #define DOMAIN_MANAGER 1 55 #endif 56 57 #define domain_mask(dom) ((3) << (2 * (dom))) 58 #define domain_val(dom,type) ((type) << (2 * (dom))) 59 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 67 #define DACR_INIT \ 68 (domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \ 69 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ 70 domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \ 71 domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)) 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)) 83 84 #ifndef __ASSEMBLY__ 85 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 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 } 104 105 #ifdef CONFIG_CPU_USE_DOMAINS 106 #define modify_domain(dom,type) \ 107 do { \ 108 unsigned int domain = get_domain(); \ 109 domain &= ~domain_mask(dom); \ 110 domain = domain | domain_val(dom, type); \ 111 set_domain(domain); \ 112 } while (0) 113 114 #else 115 static inline void modify_domain(unsigned dom, unsigned type) { } 116 #endif 117 118 /* 119 * Generate the T (user) versions of the LDR/STR and related 120 * instructions (inline assembly) 121 */ 122 #ifdef CONFIG_CPU_USE_DOMAINS 123 #define TUSER(instr) #instr "t" 124 #else 125 #define TUSER(instr) #instr 126 #endif 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 135 #define TUSER(instr) instr ## t 136 #else 137 #define TUSER(instr) instr 138 #endif 139 140 #endif /* __ASSEMBLY__ */ 141 142 #endif /* !__ASM_PROC_DOMAIN_H */ 143