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arm64: add macro to extract ESR_ELx.EC

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Several places open-code extraction of the EC field from an ESR_ELx
value, in subtly different ways. This is unfortunate duplication and
variation, and the precise logic used to extract the field is a
distraction.

This patch adds a new macro, ESR_ELx_EC(), to extract the EC field from
an ESR_ELx value in a consistent fashion.

Existing open-coded extractions in core arm64 code are moved over to the
new helper. KVM code is left as-is for the moment.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Huang Shijie <shijie.huang@arm.com>
Cc: Dave P Martin <dave.martin@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Rutland 2016-05-31 12:33:01 +01:00 committed by Catalin Marinas
parent b67a8b29df
commit 275f344bec
3 changed files with 3 additions and 2 deletions
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1
arch/arm64/include/asm/esr.h
View File

@ -74,6 +74,7 @@
#define ESR_ELx_EC_SHIFT (26)
#define ESR_ELx_EC_MASK (UL(0x3F) << ESR_ELx_EC_SHIFT)
#define ESR_ELx_EC(esr) (((esr) & ESR_ELx_EC_MASK) >> ESR_ELx_EC_SHIFT)
#define ESR_ELx_IL (UL(1) << 25)
#define ESR_ELx_ISS_MASK (ESR_ELx_IL - 1)

2
arch/arm64/kernel/traps.c
View File

@ -456,7 +456,7 @@ static const char *esr_class_str[] = {
const char *esr_get_class_string(u32 esr)
{
return esr_class_str[esr >> ESR_ELx_EC_SHIFT];
return esr_class_str[ESR_ELx_EC(esr)];
}
/*

2
arch/arm64/mm/fault.c
View File

@ -244,7 +244,7 @@ out:
static inline int permission_fault(unsigned int esr)
{
unsigned int ec = (esr & ESR_ELx_EC_MASK) >> ESR_ELx_EC_SHIFT;
unsigned int ec = ESR_ELx_EC(esr);
unsigned int fsc_type = esr & ESR_ELx_FSC_TYPE;
return (ec == ESR_ELx_EC_DABT_CUR && fsc_type == ESR_ELx_FSC_PERM);