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/*
* arch/arm/include/asm/domain.h
*
* Copyright (C) 1999 Russell King.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_PROC_DOMAIN_H
#define __ASM_PROC_DOMAIN_H
#ifndef __ASSEMBLY__
#include <asm/barrier.h>
#endif
/*
* Domain numbers
*
* DOMAIN_IO - domain 2 includes all IO only
* DOMAIN_USER - domain 1 includes all user memory only
* DOMAIN_KERNEL - domain 0 includes all kernel memory only
*
* The domain numbering depends on whether we support 36 physical
* address for I/O or not. Addresses above the 32 bit boundary can
* only be mapped using supersections and supersections can only
* be set for domain 0. We could just default to DOMAIN_IO as zero,
* but there may be systems with supersection support and no 36-bit
* addressing. In such cases, we want to map system memory with
* supersections to reduce TLB misses and footprint.
*
* 36-bit addressing and supersections are only available on
* CPUs based on ARMv6+ or the Intel XSC3 core.
*/
#ifndef CONFIG_IO_36
#define DOMAIN_KERNEL 0
#define DOMAIN_TABLE 0
#define DOMAIN_USER 1
#define DOMAIN_IO 2
#else
#define DOMAIN_KERNEL 2
#define DOMAIN_TABLE 2
#define DOMAIN_USER 1
#define DOMAIN_IO 0
#endif
/*
* Domain types
*/
#define DOMAIN_NOACCESS 0
#define DOMAIN_CLIENT 1
#ifdef CONFIG_CPU_USE_DOMAINS
#define DOMAIN_MANAGER 3
#else
#define DOMAIN_MANAGER 1
#endif
#define domain_mask(dom) ((3) << (2 * (dom)))
#define domain_val(dom,type) ((type) << (2 * (dom)))
#define DACR_INIT \
(domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \
domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \
domain_val(DOMAIN_IO, DOMAIN_CLIENT))
#ifndef __ASSEMBLY__
static inline unsigned int get_domain(void)
{
unsigned int domain;
asm(
"mrc p15, 0, %0, c3, c0 @ get domain"
: "=r" (domain));
return domain;
}
#ifdef CONFIG_CPU_USE_DOMAINS
static inline void set_domain(unsigned val)
{
asm volatile(
"mcr p15, 0, %0, c3, c0 @ set domain"
: : "r" (val));
isb();
}
#define modify_domain(dom,type) \
do { \
unsigned int domain = get_domain(); \
domain &= ~domain_mask(dom); \
domain = domain | domain_val(dom, type); \
set_domain(domain); \
} while (0)
#else
static inline void set_domain(unsigned val) { }
static inline void modify_domain(unsigned dom, unsigned type) { }
#endif
/*
* Generate the T (user) versions of the LDR/STR and related
* instructions (inline assembly)
*/
#ifdef CONFIG_CPU_USE_DOMAINS
#define TUSER(instr) #instr "t"
#else
#define TUSER(instr) #instr
#endif
#else /* __ASSEMBLY__ */
/*
* Generate the T (user) versions of the LDR/STR and related
* instructions
*/
#ifdef CONFIG_CPU_USE_DOMAINS
#define TUSER(instr) instr ## t
#else
#define TUSER(instr) instr
#endif
#endif /* __ASSEMBLY__ */
#endif /* !__ASM_PROC_DOMAIN_H */
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