mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 12:21:37 +00:00
6e8f580d1f
We need to have memory dependencies on get_domain/set_domain to avoid the compiler over-optimising these inline assembly instructions. Loads/stores must not be reordered across a set_domain(), so introduce a compiler barrier for that assembly. The value of get_domain() must not be cached across a set_domain(), but we still want to allow the compiler to optimise it away. Introduce a dependency on current_thread_info()->cpu_domain to avoid this; the new memory clobber in set_domain() should therefore cause the compiler to re-load this. The other advantage of using this is we should have its address in the register set already, or very soon after at most call sites. Tested-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/*
|
|
* 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>
|
|
#include <asm/thread_info.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_USER 1
|
|
#define DOMAIN_IO 2
|
|
#else
|
|
#define DOMAIN_KERNEL 2
|
|
#define DOMAIN_USER 1
|
|
#define DOMAIN_IO 0
|
|
#endif
|
|
#define DOMAIN_VECTORS 3
|
|
|
|
/*
|
|
* 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)))
|
|
|
|
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
|
|
#define DACR_INIT \
|
|
(domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \
|
|
domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
|
|
domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
|
|
domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
|
|
#else
|
|
#define DACR_INIT \
|
|
(domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \
|
|
domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
|
|
domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
|
|
domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT))
|
|
#endif
|
|
|
|
#define __DACR_DEFAULT \
|
|
domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \
|
|
domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \
|
|
domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)
|
|
|
|
#define DACR_UACCESS_DISABLE \
|
|
(__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS))
|
|
#define DACR_UACCESS_ENABLE \
|
|
(__DACR_DEFAULT | domain_val(DOMAIN_USER, 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)
|
|
: "m" (current_thread_info()->cpu_domain));
|
|
|
|
return domain;
|
|
}
|
|
|
|
static inline void set_domain(unsigned val)
|
|
{
|
|
asm volatile(
|
|
"mcr p15, 0, %0, c3, c0 @ set domain"
|
|
: : "r" (val) : "memory");
|
|
isb();
|
|
}
|
|
|
|
#ifdef CONFIG_CPU_USE_DOMAINS
|
|
#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 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 */
|