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arm64: uaccess: Add PAN helper

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Add __uaccess_{en,dis}able_hw_pan() helpers to set/clear the PSTATE.PAN
bit.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
James Morse
2018-01-08 15:38:11 +00:00
committed by Catalin Marinas
parent ed8b20d457
commit e1281f56f1
2 changed files with 14 additions and 2 deletions
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12
arch/arm64/include/asm/uaccess.h
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@@ -168,6 +168,18 @@ static inline bool uaccess_ttbr0_enable(void)
}
#endif
static inline void __uaccess_disable_hw_pan(void)
{
asm(ALTERNATIVE("nop", SET_PSTATE_PAN(0), ARM64_HAS_PAN,
CONFIG_ARM64_PAN));
}
static inline void __uaccess_enable_hw_pan(void)
{
asm(ALTERNATIVE("nop", SET_PSTATE_PAN(1), ARM64_HAS_PAN,
CONFIG_ARM64_PAN));
}
#define __uaccess_disable(alt) \
do { \
if (!uaccess_ttbr0_disable()) \