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| author | Marc Zyngier <maz@kernel.org> | 2024-07-15 13:09:29 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2024-08-30 12:04:20 +0100 |
| commit | b229b46b0bf7828bef5f88c91708776869b751ac (patch) | |
| tree | c4b66fac0a3a94d9255ca3abbb8e345aef78c3bc | |
| parent | 6dcd2ac7ea7c5b20b416ee09d8d5d2ec89866ef8 (diff) | |
arm64: Add system register encoding for PSTATE.PAN
Although we already have the primitives to set PSTATE.PAN with an
immediate, we don't have a way to read the current state nor set
it ot an arbitrary value (i.e. we can generally save/restore it).
Thankfully, all that is missing for this is the definition for
the PAN pseudo system register, here named SYS_PSTATE_PAN.
Signed-off-by: Marc Zyngier <maz@kernel.org>
| -rw-r--r-- | arch/arm64/include/asm/sysreg.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index d9d5e07f768d..a2787091d5a0 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -109,6 +109,9 @@ #define set_pstate_ssbs(x) asm volatile(SET_PSTATE_SSBS(x)) #define set_pstate_dit(x) asm volatile(SET_PSTATE_DIT(x)) +/* Register-based PAN access, for save/restore purposes */ +#define SYS_PSTATE_PAN sys_reg(3, 0, 4, 2, 3) + #define __SYS_BARRIER_INSN(CRm, op2, Rt) \ __emit_inst(0xd5000000 | sys_insn(0, 3, 3, (CRm), (op2)) | ((Rt) & 0x1f)) |