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authorDaniel Thompson <daniel.thompson@linaro.org>2016-08-19 16:13:09 (GMT)
committerMarc Zyngier <marc.zyngier@arm.com>2016-09-12 18:46:19 (GMT)
commit91ef84428a86b75a52e15c6fe4f56b446ba75f93 (patch)
tree46066d44e3ddccef1b4d0056955eb59ffc67cf54 /arch/arm/include
parent04c8b0f82c7d5a9a1c296eef914ae3bb820bcb85 (diff)
downloadlinux-91ef84428a86b75a52e15c6fe4f56b446ba75f93.tar.xz
irqchip/gic-v3: Reset BPR during initialization
Currently, when running on FVP, CPU 0 boots up with its BPR changed from the reset value. This renders it impossible to (preemptively) prioritize interrupts on CPU 0. This is harmless on normal systems since Linux typically does not support preemptive interrupts. It does however cause problems in systems with additional changes (such as patches for NMI simulation). Many thanks to Andrew Thoelke for suggesting the BPR as having the potential to harm preemption. Suggested-by: Andrew Thoelke <andrew.thoelke@arm.com> Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/arch_gicv3.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch_gicv3.h b/arch/arm/include/asm/arch_gicv3.h
index e08d151..dfe4002 100644
--- a/arch/arm/include/asm/arch_gicv3.h
+++ b/arch/arm/include/asm/arch_gicv3.h
@@ -34,6 +34,7 @@
#define ICC_CTLR __ACCESS_CP15(c12, 0, c12, 4)
#define ICC_SRE __ACCESS_CP15(c12, 0, c12, 5)
#define ICC_IGRPEN1 __ACCESS_CP15(c12, 0, c12, 7)
+#define ICC_BPR1 __ACCESS_CP15(c12, 0, c12, 3)
#define ICC_HSRE __ACCESS_CP15(c12, 4, c9, 5)
@@ -157,6 +158,11 @@ static inline void gic_write_sre(u32 val)
isb();
}
+static inline void gic_write_bpr1(u32 val)
+{
+ asm volatile("mcr " __stringify(ICC_BPR1) : : "r" (val));
+}
+
/*
* Even in 32bit systems that use LPAE, there is no guarantee that the I/O
* interface provides true 64bit atomic accesses, so using strd/ldrd doesn't