Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Russell King | 4baa992 | 2008-08-02 10:55:55 +0100 | [diff] [blame] | 2 | * arch/arm/include/asm/domain.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | */ |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 31 | #ifndef CONFIG_IO_36 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #define DOMAIN_KERNEL 0 |
| 33 | #define DOMAIN_TABLE 0 |
| 34 | #define DOMAIN_USER 1 |
| 35 | #define DOMAIN_IO 2 |
Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 36 | #else |
| 37 | #define DOMAIN_KERNEL 2 |
| 38 | #define DOMAIN_TABLE 2 |
| 39 | #define DOMAIN_USER 1 |
| 40 | #define DOMAIN_IO 0 |
| 41 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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__ |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 53 | |
| 54 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #define set_domain(x) \ |
| 56 | do { \ |
| 57 | __asm__ __volatile__( \ |
| 58 | "mcr p15, 0, %0, c3, c0 @ set domain" \ |
| 59 | : : "r" (x)); \ |
Catalin Marinas | 620879c | 2007-02-05 14:47:46 +0100 | [diff] [blame] | 60 | isb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Russell King | 002547b | 2006-06-20 20:46:52 +0100 | [diff] [blame] | 72 | #else |
| 73 | #define set_domain(x) do { } while (0) |
| 74 | #define modify_domain(dom,type) do { } while (0) |
| 75 | #endif |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #endif |
| 78 | #endif /* !__ASSEMBLY__ */ |