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Date: Mon, 10 Dec 2012 08:59:17 +0900 From: Boojin Kim <boojin.kim@...sung.com> To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Cc: 'Russell King' <linux@....linux.org.uk>, 'Will Deacon' <will.deacon@....com>, 'Catalin Marinas' <Catalin.Marinas@....com>, 'Kukjin Kim' <kgene.kim@...sung.com>, 'Boojin Kim' <boojin.kim@...sung.com> Subject: [PATCH 2/3] ARM: MM: Add the workaround of Errata 773022 This patch adds the workaround of Errata 773022 that disables loop buffer. Signed-off-by: Boojin Kim <boojin.kim@...sung.com> --- arch/arm/Kconfig | 10 ++++++++++ arch/arm/mach-exynos/Kconfig | 1 + arch/arm/mm/proc-v7.S | 6 ++++++ 3 files changed, 17 insertions(+), 0 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 11a57e2..93397da 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1417,6 +1417,16 @@ config ARM_ERRATA_775420 to deadlock. This workaround puts DSB before executing ISB if an abort may occur on cache maintenance. +config ARM_ERRATA_773022 + bool "ARM errata: incorrect instructions may be executed from loop buffer" + depends on CPU_V7 + help + This option enables the workaround for the erratum 773022 affecting + Cortex-A15 (r0p4). + In certain rare sequences of code, the loop buffer may deliver + incorrect instructions. + This workaround is to disable loop buffer. + config ARM_ERRATA_774769 bool "ARM errata: data corruption may occur with store streaming in a system" depends on CPU_V7 diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig index e1168fb..bb92f4c 100644 --- a/arch/arm/mach-exynos/Kconfig +++ b/arch/arm/mach-exynos/Kconfig @@ -22,6 +22,7 @@ config ARCH_EXYNOS4 config ARCH_EXYNOS5 bool "SAMSUNG EXYNOS5" select HAVE_SMP + select ARM_ERRATA_773022 select ARM_ERRATA_774769 help Samsung EXYNOS5 (Cortex-A15) SoC based systems diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 06cbdfa..0b4c518 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -249,6 +249,12 @@ __v7_setup: 3: ldr r10, =0x00000c0f @ Cortex-A15 primary part number teq r0, r10 bne 4f +#ifdef CONFIG_ARM_ERRATA_773022 + teq r6, #0x4 @ present in r0p4 + mrceq p15, 0, r10, c1, c0, 1 @ read aux control register + orreq r10, r10, #1 << 1 @ set bit #1 + mcreq p15, 0, r10, c1, c0, 1 @ write aux control register +#endif #ifdef CONFIG_ARM_ERRATA_774769 teq r6, #0x4 @ present in r0p4 mrceq p15, 0, r10, c1, c0, 1 @ read aux control register -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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