asm_helper.h File Reference

Assembly helper macros for system register access. More...

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Macros
#define	READ_SYS_REG(reg, val)
#define	WRITE_SYS_REG(reg, val)

Detailed Description

Assembly helper macros for system register access.

Declares macros that wrap MRS/MSR instructions for reading and writing ARM64 system registers from C.

Author

Abhin Parekadan Jose

Date

2026-05-16

Macro Definition Documentation

READ_SYS_REG

#define READ_SYS_REG	(		reg,
			val
	)

Value:

    do {                                               \
        asm volatile("mrs %0, " #reg : "=r"(val)); \
    } while (0)

Read a system register

WRITE_SYS_REG

#define WRITE_SYS_REG	(		reg,
			val
	)

Value:

    do {                                                   \
        asm volatile("msr " #reg ", %0" : : "r"(val)); \
    } while (0)

Write to a system register