sparc64: Implement IRQ stacks.

[linux-2.6-omap-h63xx.git] / arch / sparc64 / kernel / irq.c

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index ba43d85e8dded537cfeb4a23c510456e4f2c956f..9b6689d9d57097239641d51653dc921e2607b997 100644 (file)
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -682,10 +682,32 @@ void ack_bad_irq(unsigned int virt_irq)
               ino, virt_irq);
 }
 
+void *hardirq_stack[NR_CPUS];
+void *softirq_stack[NR_CPUS];
+
+static __attribute__((always_inline)) void *set_hardirq_stack(void)
+{
+       void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
+
+       __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
+       if (orig_sp < sp ||
+           orig_sp > (sp + THREAD_SIZE)) {
+               sp += THREAD_SIZE - 192 - STACK_BIAS;
+               __asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
+       }
+
+       return orig_sp;
+}
+static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
+{
+       __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
+}
+
 void handler_irq(int irq, struct pt_regs *regs)
 {
        unsigned long pstate, bucket_pa;
        struct pt_regs *old_regs;
+       void *orig_sp;
 
        clear_softint(1 << irq);
 
@@ -703,6 +725,8 @@ void handler_irq(int irq, struct pt_regs *regs)
                               "i" (PSTATE_IE)
                             : "memory");
 
+       orig_sp = set_hardirq_stack();
+
        while (bucket_pa) {
                struct irq_desc *desc;
                unsigned long next_pa;
@@ -719,10 +743,38 @@ void handler_irq(int irq, struct pt_regs *regs)
                bucket_pa = next_pa;
        }
 
+       restore_hardirq_stack(orig_sp);
+
        irq_exit();
        set_irq_regs(old_regs);
 }
 
+void do_softirq(void)
+{
+       unsigned long flags;
+
+       if (in_interrupt())
+               return;
+
+       local_irq_save(flags);
+
+       if (local_softirq_pending()) {
+               void *orig_sp, *sp = softirq_stack[smp_processor_id()];
+
+               sp += THREAD_SIZE - 192 - STACK_BIAS;
+
+               __asm__ __volatile__("mov %%sp, %0\n\t"
+                                    "mov %1, %%sp"
+                                    : "=&r" (orig_sp)
+                                    : "r" (sp));
+               __do_softirq();
+               __asm__ __volatile__("mov %0, %%sp"
+                                    : : "r" (orig_sp));
+       }
+
+       local_irq_restore(flags);
+}
+
 #ifdef CONFIG_HOTPLUG_CPU
 void fixup_irqs(void)
 {