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Subject[RFC PATCH] ARM: Add imprecise abort enable/disable macro
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This patch adds imprecise abort enable/disable macros.
It also enables imprecise aborts when starting kernel.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
arch/arm/include/asm/irqflags.h | 33 +++++++++++++++++++++++++++++++++
arch/arm/kernel/smp.c | 1 +
arch/arm/kernel/traps.c | 4 ++++
3 files changed, 38 insertions(+)

diff --git a/arch/arm/include/asm/irqflags.h b/arch/arm/include/asm/irqflags.h
index 3b763d6..82e3834 100644
--- a/arch/arm/include/asm/irqflags.h
+++ b/arch/arm/include/asm/irqflags.h
@@ -51,6 +51,9 @@ 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")
+
+#define local_abt_enable() __asm__("cpsie a @ __sta" : : : "memory", "cc")
+#define local_abt_disable() __asm__("cpsid a @ __cla" : : : "memory", "cc")
#else

/*
@@ -130,6 +133,36 @@ static inline void arch_local_irq_disable(void)
: "memory", "cc"); \
})

+/*
+ * Enable Aborts
+ */
+#define local_abt_enable() \
+ ({ \
+ unsigned long temp; \
+ __asm__ __volatile__( \
+ "mrs %0, cpsr @ sta\n" \
+" bic %0, %0, %1\n" \
+" msr cpsr_c, %0" \
+ : "=r" (temp) \
+ : "r" (PSR_A_BIT) \
+ : "memory", "cc"); \
+ })
+
+/*
+ * Disable Aborts
+ */
+#define local_abt_disable() \
+ ({ \
+ unsigned long temp; \
+ __asm__ __volatile__( \
+ "mrs %0, cpsr @ cla\n" \
+" orr %0, %0, %1\n" \
+" msr cpsr_c, %0" \
+ : "=r" (temp) \
+ : "r" (PSR_A_BIT) \
+ : "memory", "cc"); \
+ })
+
#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


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