1 /* 2 * linux/include/asm-arm/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 #define DOMAIN_MANAGER 3 49 50 #define domain_val(dom,type) ((type) << (2*(dom))) 51 52 #ifndef __ASSEMBLY__ 53 54 #ifdef CONFIG_MMU 55 #define set_domain(x) \ 56 do { \ 57 __asm__ __volatile__( \ 58 "mcr p15, 0, %0, c3, c0 @ set domain" \ 59 : : "r" (x)); \ 60 } while (0) 61 62 #define modify_domain(dom,type) \ 63 do { \ 64 struct thread_info *thread = current_thread_info(); \ 65 unsigned int domain = thread->cpu_domain; \ 66 domain &= ~domain_val(dom, DOMAIN_MANAGER); \ 67 thread->cpu_domain = domain | domain_val(dom, type); \ 68 set_domain(thread->cpu_domain); \ 69 } while (0) 70 71 #else 72 #define set_domain(x) do { } while (0) 73 #define modify_domain(dom,type) do { } while (0) 74 #endif 75 76 #endif 77 #endif /* !__ASSEMBLY__ */ 78