Commit b229b46b authored Jul 15, 2024 by Marc Zyngier

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>

parent 6dcd2ac7

arch/arm64/include/asm/sysreg.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -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))