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arm64: add arm64_current_el to obtain current EL

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Summary
  Add a macro to obtain current execute level

Signed-off-by: qinwei1 <qinwei1@xiaomi.com>
This commit is contained in:
qinwei1 2023-10-30 17:44:57 +08:00 committed by Xiang Xiao
parent 40d40015f4
commit d782f6c1ac
1 changed files with 20 additions and 0 deletions
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20
arch/arm64/src/common/arm64_arch.h
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@ -391,6 +391,26 @@ static inline void arch_nop(void)
__asm__ volatile ("nop");
}
/****************************************************************************
* Name:
* arm64_current_el()
*
* Description:
*
* Get current execution level
*
****************************************************************************/
#define arm64_current_el() \
({ \
uint64_t __el; \
int __ret; \
__asm__ volatile ("mrs %0, CurrentEL" \
: "=r" (__el)); \
__ret = GET_EL(__el); \
__ret; \
})
/****************************************************************************
* Name:
* read_/write_/zero_ sysreg