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 63 static 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 81 static inline void set_domain(unsigned val) { } 82 static 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