Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752681AbaBJQqn (ORCPT ); Mon, 10 Feb 2014 11:46:43 -0500 Received: from eu1sys200aog117.obsmtp.com ([207.126.144.143]:54900 "EHLO eu1sys200aog117.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751920AbaBJQql (ORCPT ); Mon, 10 Feb 2014 11:46:41 -0500 From: Fabrice GASNIER To: linux@arm.linux.org.uk, u.kleine-koenig@pengutronix.de, jonathan.austin@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, nico@linaro.org, sboyd@codeaurora.org, marc.zyngier@arm.com, ben.dooks@codethink.co.uk, vgupta@synopsys.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: maxime.coquelin@st.com Subject: [PATCH v2] ARM: Add imprecise abort enable/disable macro Date: Mon, 10 Feb 2014 17:45:56 +0100 Message-Id: <1392050756-11145-1-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds imprecise abort enable/disable macros. It also enables imprecise aborts when starting kernel. Changes in v2: Only ARMv6 and later have CPSR.A bit. On earlier CPUs, and ARMv7M this should be a no-op. Signed-off-by: Fabrice Gasnier --- arch/arm/include/asm/irqflags.h | 10 ++++++++++ arch/arm/kernel/smp.c | 1 + arch/arm/kernel/traps.c | 4 ++++ 3 files changed, 15 insertions(+) diff --git a/arch/arm/include/asm/irqflags.h b/arch/arm/include/asm/irqflags.h index 3b763d6..8301f87 100644 --- a/arch/arm/include/asm/irqflags.h +++ b/arch/arm/include/asm/irqflags.h @@ -51,6 +51,14 @@ static inline void arch_local_irq_disable(void) #define local_fiq_enable() __asm__("cpsie f @ __stf" : : : "memory", "cc") #define local_fiq_disable() __asm__("cpsid f @ __clf" : : : "memory", "cc") + +#ifndef CONFIG_CPU_V7M +#define local_abt_enable() __asm__("cpsie a @ __sta" : : : "memory", "cc") +#define local_abt_disable() __asm__("cpsid a @ __cla" : : : "memory", "cc") +#else +#define local_abt_enable() do { } while (0) +#define local_abt_disable() do { } while (0) +#endif #else /* @@ -130,6 +138,8 @@ static inline void arch_local_irq_disable(void) : "memory", "cc"); \ }) +#define local_abt_enable() do { } while (0) +#define local_abt_disable() do { } while (0) #endif /* diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index dc894ab..c2093cb 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -377,6 +377,7 @@ asmlinkage void secondary_start_kernel(void) local_irq_enable(); local_fiq_enable(); + local_abt_enable(); /* * OK, it's off to the idle thread for us diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 4636d56..ef15709 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -900,6 +900,10 @@ void __init early_trap_init(void *vectors_base) flush_icache_range(vectors, vectors + PAGE_SIZE * 2); modify_domain(DOMAIN_USER, DOMAIN_CLIENT); + + /* Enable imprecise aborts */ + local_abt_enable(); + #else /* ifndef CONFIG_CPU_V7M */ /* * on V7-M there is no need to copy the vector table to a dedicated -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/