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 /* 14 * Domain numbers 15 * 16 * DOMAIN_IO - domain 2 includes all IO only 17 * DOMAIN_USER - domain 1 includes all user memory only 18 * DOMAIN_KERNEL - domain 0 includes all kernel memory only 19 * 20 * The domain numbering depends on whether we support 36 physical 21 * address for I/O or not. Addresses above the 32 bit boundary can 22 * only be mapped using supersections and supersections can only 23 * be set for domain 0. We could just default to DOMAIN_IO as zero, 24 * but there may be systems with supersection support and no 36-bit 25 * addressing. In such cases, we want to map system memory with 26 * supersections to reduce TLB misses and footprint. 27 * 28 * 36-bit addressing and supersections are only available on 29 * CPUs based on ARMv6+ or the Intel XSC3 core. 30 */ 31 #ifndef CONFIG_IO_36 32 #define DOMAIN_KERNEL 0 33 #define DOMAIN_TABLE 0 34 #define DOMAIN_USER 1 35 #define DOMAIN_IO 2 36 #else 37 #define DOMAIN_KERNEL 2 38 #define DOMAIN_TABLE 2 39 #define DOMAIN_USER 1 40 #define DOMAIN_IO 0 41 #endif 42 43 /* 44 * Domain types 45 */ 46 #define DOMAIN_NOACCESS 0 47 #define DOMAIN_CLIENT 1 48 #ifdef CONFIG_CPU_USE_DOMAINS 49 #define DOMAIN_MANAGER 3 50 #else 51 #define DOMAIN_MANAGER 1 52 #endif 53 54 #define domain_val(dom,type) ((type) << (2*(dom))) 55 56 #ifndef __ASSEMBLY__ 57 58 #ifdef CONFIG_CPU_USE_DOMAINS 59 #define set_domain(x) \ 60 do { \ 61 __asm__ __volatile__( \ 62 "mcr p15, 0, %0, c3, c0 @ set domain" \ 63 : : "r" (x)); \ 64 isb(); \ 65 } while (0) 66 67 #define modify_domain(dom,type) \ 68 do { \ 69 struct thread_info *thread = current_thread_info(); \ 70 unsigned int domain = thread->cpu_domain; \ 71 domain &= ~domain_val(dom, DOMAIN_MANAGER); \ 72 thread->cpu_domain = domain | domain_val(dom, type); \ 73 set_domain(thread->cpu_domain); \ 74 } while (0) 75 76 #else 77 #define set_domain(x) do { } while (0) 78 #define modify_domain(dom,type) do { } while (0) 79 #endif 80 81 /* 82 * Generate the T (user) versions of the LDR/STR and related 83 * instructions (inline assembly) 84 */ 85 #ifdef CONFIG_CPU_USE_DOMAINS 86 #define T(instr) #instr "t" 87 #else 88 #define T(instr) #instr 89 #endif 90 91 #else /* __ASSEMBLY__ */ 92 93 /* 94 * Generate the T (user) versions of the LDR/STR and related 95 * instructions 96 */ 97 #ifdef CONFIG_CPU_USE_DOMAINS 98 #define T(instr) instr ## t 99 #else 100 #define T(instr) instr 101 #endif 102 103 #endif /* __ASSEMBLY__ */ 104 105 #endif /* !__ASM_PROC_DOMAIN_H */ 106