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| author | Eugeniy Paltsev | 2019-01-30 17:32:41 +0100 |
|---|---|---|
| committer | Vineet Gupta | 2019-02-25 21:10:58 +0100 |
| commit | 76551468833cd5c356b1d9ff4bc9393fcf768a59 (patch) | |
| tree | 8e2552cc13389bc3c90c916b0342bfac7f3a90b1 /arch/arc/include | |
| parent | ARCv2: lib: introduce memcpy optimized for unaligned access (diff) | |
| download | kernel-qcow2-linux-76551468833cd5c356b1d9ff4bc9393fcf768a59.tar.gz kernel-qcow2-linux-76551468833cd5c356b1d9ff4bc9393fcf768a59.tar.xz kernel-qcow2-linux-76551468833cd5c356b1d9ff4bc9393fcf768a59.zip | |
ARCv2: Add explcit unaligned access support (and ability to disable too)
As of today we enable unaligned access unconditionally on ARCv2.
Do this under a Kconfig option to allow disable it for test, benchmarking
etc. Also while at it
- Select HAVE_EFFICIENT_UNALIGNED_ACCESS
- Although gcc defaults to unaligned access (since GNU 2018.03), add the
right toggles for enabling or disabling as appropriate
- update bootlog to prints both HW feature status (exists, enabled/disabled)
and SW status (used / not used).
- wire up the relaxed memcpy for unaligned access
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: squashed patches, handle gcc -mno-unaligned-access quick]
Diffstat (limited to 'arch/arc/include')
| -rw-r--r-- | arch/arc/include/asm/arcregs.h | 1 | ||||
| -rw-r--r-- | arch/arc/include/asm/irqflags-arcv2.h | 8 |
2 files changed, 8 insertions, 1 deletions
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h index a27eafdc8260..0c13317af1d6 100644 --- a/arch/arc/include/asm/arcregs.h +++ b/arch/arc/include/asm/arcregs.h @@ -82,6 +82,7 @@ #define ECR_V_DTLB_MISS 0x05 #define ECR_V_PROTV 0x06 #define ECR_V_TRAP 0x09 +#define ECR_V_MISALIGN 0x0d #endif /* DTLB Miss and Protection Violation Cause Codes */ diff --git a/arch/arc/include/asm/irqflags-arcv2.h b/arch/arc/include/asm/irqflags-arcv2.h index 8a4f77ea3238..e66d0339e1d8 100644 --- a/arch/arc/include/asm/irqflags-arcv2.h +++ b/arch/arc/include/asm/irqflags-arcv2.h @@ -44,7 +44,13 @@ #define ARCV2_IRQ_DEF_PRIO 1 /* seed value for status register */ -#define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | STATUS_AD_MASK | \ +#ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS +#define __AD_ENB STATUS_AD_MASK +#else +#define __AD_ENB 0 +#endif + +#define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | __AD_ENB | \ (ARCV2_IRQ_DEF_PRIO << 1)) #ifndef __ASSEMBLY__ |