Commit 445c953e authored by James Morse's avatar James Morse Committed by Catalin Marinas
Browse files

arm64: cpufeature: Expose get_arm64_ftr_reg() outside cpufeature.c 



get_arm64_ftr_reg() returns the properties of a system register based
on its instruction encoding.

This is needed by erratum workaround in cpu_errata.c to modify the
user-space visible view of id registers.

Signed-off-by: default avatarJames Morse <james.morse@arm.com>
Reviewed-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220909165938.3931307-3-james.morse@arm.com


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 237405eb

arch/arm64/include/asm/cpufeature.h

+2 −0
Original line number Diff line number Diff line
@@ -907,6 +907,8 @@ static inline unsigned int get_vmid_bits(u64 mmfr1) 
	return 8;

}



struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id);



extern struct arm64_ftr_override id_aa64mmfr1_override;

extern struct arm64_ftr_override id_aa64pfr0_override;

extern struct arm64_ftr_override id_aa64pfr1_override;

arch/arm64/kernel/cpufeature.c

+1 −1
Original line number Diff line number Diff line
@@ -750,7 +750,7 @@ static struct arm64_ftr_reg *get_arm64_ftr_reg_nowarn(u32 sys_id) 
 * returns - Upon success,  matching ftr_reg entry for id.

 *         - NULL on failure but with an WARN_ON().

 */

static struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id)

struct arm64_ftr_reg *get_arm64_ftr_reg(u32 sys_id)

{

	struct arm64_ftr_reg *reg;