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 isb(); \ 61 } while (0) 62 63#define modify_domain(dom,type) \ 64 do { \ 65 struct thread_info *thread = current_thread_info(); \ 66 unsigned int domain = thread->cpu_domain; \ 67 domain &= ~domain_val(dom, DOMAIN_MANAGER); \ 68 thread->cpu_domain = domain | domain_val(dom, type); \ 69 set_domain(thread->cpu_domain); \ 70 } while (0) 71 72#else 73#define set_domain(x) do { } while (0) 74#define modify_domain(dom,type) do { } while (0) 75#endif 76 77#endif 78#endif /* !__ASSEMBLY__ */ 79