From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Fri, 23 Sep 2011 17:51:19 +0100 Subject: [RFC PATCH 01/14] ARM: GIC: Add global gic_handle_irq() function In-Reply-To: <1316796692-15964-1-git-send-email-marc.zyngier@arm.com> References: <1316796692-15964-1-git-send-email-marc.zyngier@arm.com> Message-ID: <1316796692-15964-2-git-send-email-marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Provide the GIC code with a low level handler that can be used by platforms using CONFIG_MULTI_IRQ_HANDLER. Though the handler is written in C, the compiled code doesn't feel much slower than its assembly counterpart (at least with my gcc 4.4.1). Signed-off-by: Marc Zyngier --- arch/arm/common/gic.c | 23 +++++++++++++++++++++++ arch/arm/include/asm/hardware/gic.h | 1 + 2 files changed, 24 insertions(+), 0 deletions(-) diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index a3f335c..a7b2a4a 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -209,6 +209,29 @@ static int gic_set_wake(struct irq_data *d, unsigned int on) #define gic_set_wake NULL #endif +asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) +{ + u32 irqstat, irqnr; + + do { + irqstat = readl_relaxed(gic_cpu_base_addr + GIC_CPU_INTACK); + irqnr = irqstat & ~0x1c00; + + if (likely(irqnr > 15 && irqnr < 1021)) { + handle_IRQ(irqnr, regs); + continue; + } + if (irqnr < 16) { + writel_relaxed(irqstat, gic_cpu_base_addr + GIC_CPU_EOI); +#ifdef CONFIG_SMP + do_IPI(irqnr, regs); +#endif + continue; + } + break; + } while (1); +} + static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc) { struct gic_chip_data *chip_data = irq_get_handler_data(irq); diff --git a/arch/arm/include/asm/hardware/gic.h b/arch/arm/include/asm/hardware/gic.h index 2dadd50..45e4ab4 100644 --- a/arch/arm/include/asm/hardware/gic.h +++ b/arch/arm/include/asm/hardware/gic.h @@ -38,6 +38,7 @@ extern struct irq_chip gic_arch_extn; void gic_init(unsigned int, unsigned int, void __iomem *, void __iomem *); void gic_secondary_init(unsigned int); +void gic_handle_irq(struct pt_regs *regs); void gic_cascade_irq(unsigned int gic_nr, unsigned int irq); void gic_raise_softirq(const struct cpumask *mask, unsigned int irq); -- 1.7.0.4