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

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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>
This commit is contained in:
Kevin Brodsky 2025-02-19 16:40:29 +00:00 • committed by Catalin Marinas
parent 83d78bbfd2
commit 650701e4ea
2 changed files with 2 additions and 3 deletions
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2
arch/arm64/include/asm/por.h
View file

@ -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);

3
arch/arm64/include/asm/sysreg.h
View file

@ -1086,9 +1086,6 @@
#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
*/