[PATCH v3 03/18] arm64: Add system register encoding for PSTATE.PAN

Marc Zyngier
2024-08-13T10:06:21Z

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>
---
arch/arm64/include/asm/sysreg.h | 3 +++
1 file changed, 3 insertions(+)

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))

--
2.39.2