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ARM: provide arm_has_idmap_alias() helper

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Provide a helper to indicate whether we need to perform special handling
for boot identity mapping aliases or not.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Pratyush Anand <panand@redhat.com>
This commit is contained in:
Russell King 2016-03-15 15:00:30 +00:00
parent d0506a2395
commit 07a7056ccc
1 changed files with 5 additions and 0 deletions
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5
arch/arm/include/asm/memory.h
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@ -295,6 +295,11 @@ extern long long arch_phys_to_idmap_offset;
* of physical memory for idmap purposes. Most cases should leave these
* untouched. Note: this can only return addresses less than 4GiB.
*/
static inline bool arm_has_idmap_alias(void)
{
return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
}
#define IDMAP_INVALID_ADDR ((u32)~0)
static inline unsigned long phys_to_idmap(phys_addr_t addr)