arm64/sysreg: Move POR_EL0_INIT to asm/por.h

JIRA: https://issues.redhat.com/browse/RHEL-101059

commit 650701e
Author: Kevin Brodsky <kevin.brodsky@arm.com>
Date: Wed, 19 Feb 2025 16:40:29 +0000

    The value of POR_EL0_INIT is not architectural, it is a software
    decision. Since we have a dedicated header for POR_ELx, we might as
    well define POR_EL0_INIT there.

    While at it also define POR_EL0_INIT using POR_ELx_PERM_PREP(),
    making it clearer that we are setting permissions for POIndex/pkey
    0.

    Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
    Link: https://lore.kernel.org/r/20250219164029.2309119-4-kevin.brodsky@arm.com
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Signed-off-by: Mark Salter <msalter@redhat.com>

Author: mosalter

arch/arm64/include/asm/por.h

@@ -8,6 +8,8 @@
 
 #include <asm/sysreg.h>
 
+#define POR_EL0_INIT	POR_ELx_PERM_PREP(0, POE_RWX)
+
 static inline bool por_elx_allows_read(u64 por, u8 pkey)
 {
 	u8 perm = POR_ELx_PERM_GET(pkey, por);

arch/arm64/include/asm/sysreg.h

@@ -1057,9 +1057,6 @@
 #define POR_ELx_PERM_GET(idx, reg)	(((reg) >> POR_ELx_PERM_SHIFT(idx)) & POE_MASK)
 #define POR_ELx_PERM_PREP(idx, perm)	(((perm) & POE_MASK) << POR_ELx_PERM_SHIFT(idx))
 
-/* Initial value for Permission Overlay Extension for EL0 */
-#define POR_EL0_INIT	POE_RWX
-
 /*
  * Definitions for Guarded Control Stack
  */