Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/alpha/kernel/irq_srm.c b/arch/alpha/kernel/irq_srm.c
new file mode 100644
index 0000000..0a87e46
--- /dev/null
+++ b/arch/alpha/kernel/irq_srm.c
@@ -0,0 +1,79 @@
+/*
+ * Handle interrupts from the SRM, assuming no additional weirdness.
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/irq.h>
+
+#include "proto.h"
+#include "irq_impl.h"
+
+
+/*
+ * Is the palcode SMP safe? In other words: can we call cserve_ena/dis
+ * at the same time in multiple CPUs? To be safe I added a spinlock
+ * but it can be removed trivially if the palcode is robust against smp.
+ */
+DEFINE_SPINLOCK(srm_irq_lock);
+
+static inline void
+srm_enable_irq(unsigned int irq)
+{
+ spin_lock(&srm_irq_lock);
+ cserve_ena(irq - 16);
+ spin_unlock(&srm_irq_lock);
+}
+
+static void
+srm_disable_irq(unsigned int irq)
+{
+ spin_lock(&srm_irq_lock);
+ cserve_dis(irq - 16);
+ spin_unlock(&srm_irq_lock);
+}
+
+static unsigned int
+srm_startup_irq(unsigned int irq)
+{
+ srm_enable_irq(irq);
+ return 0;
+}
+
+static void
+srm_end_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+ srm_enable_irq(irq);
+}
+
+/* Handle interrupts from the SRM, assuming no additional weirdness. */
+static struct hw_interrupt_type srm_irq_type = {
+ .typename = "SRM",
+ .startup = srm_startup_irq,
+ .shutdown = srm_disable_irq,
+ .enable = srm_enable_irq,
+ .disable = srm_disable_irq,
+ .ack = srm_disable_irq,
+ .end = srm_end_irq,
+};
+
+void __init
+init_srm_irqs(long max, unsigned long ignore_mask)
+{
+ long i;
+
+ for (i = 16; i < max; ++i) {
+ if (i < 64 && ((ignore_mask >> i) & 1))
+ continue;
+ irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
+ irq_desc[i].handler = &srm_irq_type;
+ }
+}
+
+void
+srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+ int irq = (vector - 0x800) >> 4;
+ handle_irq(irq, regs);
+}
