84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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/*
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* arch/arm/include/asm/domain.h
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*
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* Copyright (C) 1999 Russell King.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_PROC_DOMAIN_H
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#define __ASM_PROC_DOMAIN_H
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/*
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* Domain numbers
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*
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* DOMAIN_IO - domain 2 includes all IO only
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* DOMAIN_USER - domain 1 includes all user memory only
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* DOMAIN_KERNEL - domain 0 includes all kernel memory only
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*
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* The domain numbering depends on whether we support 36 physical
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* address for I/O or not. Addresses above the 32 bit boundary can
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* only be mapped using supersections and supersections can only
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* be set for domain 0. We could just default to DOMAIN_IO as zero,
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* but there may be systems with supersection support and no 36-bit
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* addressing. In such cases, we want to map system memory with
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* supersections to reduce TLB misses and footprint.
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*
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* 36-bit addressing and supersections are only available on
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* CPUs based on ARMv6+ or the Intel XSC3 core.
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*
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* We cannot use domain 0 for the kernel on QSD8x50 since the kernel domain
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* is set to manager mode when set_fs(KERNEL_DS) is called. Setting domain 0
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* to manager mode will disable the workaround for a cpu bug that can cause an
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* invalid fault status and/or tlb corruption (CONFIG_VERIFY_PERMISSION_FAULT).
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*/
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#if !defined(CONFIG_IO_36) && !defined(CONFIG_VERIFY_PERMISSION_FAULT)
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#define DOMAIN_KERNEL 0
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#define DOMAIN_TABLE 0
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#define DOMAIN_USER 1
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#define DOMAIN_IO 2
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#else
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#define DOMAIN_KERNEL 2
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#define DOMAIN_TABLE 2
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#define DOMAIN_USER 1
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#define DOMAIN_IO 0
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#endif
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/*
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* Domain types
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*/
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#define DOMAIN_NOACCESS 0
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#define DOMAIN_CLIENT 1
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#define DOMAIN_MANAGER 3
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#define domain_val(dom,type) ((type) << (2*(dom)))
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_MMU
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#define set_domain(x) \
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do { \
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__asm__ __volatile__( \
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"mcr p15, 0, %0, c3, c0 @ set domain" \
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: : "r" (x)); \
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isb(); \
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} while (0)
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#define modify_domain(dom,type) \
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do { \
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struct thread_info *thread = current_thread_info(); \
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unsigned int domain = thread->cpu_domain; \
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domain &= ~domain_val(dom, DOMAIN_MANAGER); \
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thread->cpu_domain = domain | domain_val(dom, type); \
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set_domain(thread->cpu_domain); \
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} while (0)
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#else
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#define set_domain(x) do { } while (0)
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#define modify_domain(dom,type) do { } while (0)
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#endif
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#endif
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#endif /* !__ASSEMBLY__ */
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