Merge branch 'linus' into timers/nohz

1 files changed, 221 insertions, 0 deletions

diff --git a/arch/x86/kernel/irqinit_64.c b/arch/x86/kernel/irqinit_64.c
new file mode 100644
index 000000000000..0373e88de95a
--- /dev/null
+++ b/arch/x86/kernel/irqinit_64.c
@@ -0,0 +1,221 @@
+#include <linux/linkage.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/sysdev.h>
+#include <linux/bitops.h>
+
+#include <asm/acpi.h>
+#include <asm/atomic.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/hw_irq.h>
+#include <asm/pgtable.h>
+#include <asm/delay.h>
+#include <asm/desc.h>
+#include <asm/apic.h>
+#include <asm/i8259.h>
+
+/*
+ * Common place to define all x86 IRQ vectors
+ *
+ * This builds up the IRQ handler stubs using some ugly macros in irq.h
+ *
+ * These macros create the low-level assembly IRQ routines that save
+ * register context and call do_IRQ(). do_IRQ() then does all the
+ * operations that are needed to keep the AT (or SMP IOAPIC)
+ * interrupt-controller happy.
+ */
+
+#define IRQ_NAME2(nr) nr##_interrupt(void)
+#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
+
+/*
+ *      SMP has a few special interrupts for IPI messages
+ */
+
+#define BUILD_IRQ(nr)                           \
+        asmlinkage void IRQ_NAME(nr);           \
+        asm("\n.p2align\n"                      \
+            "IRQ" #nr "_interrupt:\n\t"         \
+            "push $~(" #nr ") ; "               \
+            "jmp common_interrupt");
+
+#define BI(x,y) \
+        BUILD_IRQ(x##y)
+
+#define BUILD_16_IRQS(x) \
+        BI(x,0) BI(x,1) BI(x,2) BI(x,3) \
+        BI(x,4) BI(x,5) BI(x,6) BI(x,7) \
+        BI(x,8) BI(x,9) BI(x,a) BI(x,b) \
+        BI(x,c) BI(x,d) BI(x,e) BI(x,f)
+
+/*
+ * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
+ * (these are usually mapped to vectors 0x30-0x3f)
+ */
+
+/*
+ * The IO-APIC gives us many more interrupt sources. Most of these
+ * are unused but an SMP system is supposed to have enough memory ...
+ * sometimes (mostly wrt. hw bugs) we get corrupted vectors all
+ * across the spectrum, so we really want to be prepared to get all
+ * of these. Plus, more powerful systems might have more than 64
+ * IO-APIC registers.
+ *
+ * (these are usually mapped into the 0x30-0xff vector range)
+ */
+                                      BUILD_16_IRQS(0x2) BUILD_16_IRQS(0x3)
+BUILD_16_IRQS(0x4) BUILD_16_IRQS(0x5) BUILD_16_IRQS(0x6) BUILD_16_IRQS(0x7)
+BUILD_16_IRQS(0x8) BUILD_16_IRQS(0x9) BUILD_16_IRQS(0xa) BUILD_16_IRQS(0xb)
+BUILD_16_IRQS(0xc) BUILD_16_IRQS(0xd) BUILD_16_IRQS(0xe) BUILD_16_IRQS(0xf)
+
+#undef BUILD_16_IRQS
+#undef BI
+
+
+#define IRQ(x,y) \
+        IRQ##x##y##_interrupt
+
+#define IRQLIST_16(x) \
+        IRQ(x,0), IRQ(x,1), IRQ(x,2), IRQ(x,3), \
+        IRQ(x,4), IRQ(x,5), IRQ(x,6), IRQ(x,7), \
+        IRQ(x,8), IRQ(x,9), IRQ(x,a), IRQ(x,b), \
+        IRQ(x,c), IRQ(x,d), IRQ(x,e), IRQ(x,f)
+
+/* for the irq vectors */
+static void (*__initdata interrupt[NR_VECTORS - FIRST_EXTERNAL_VECTOR])(void) = {
+                                          IRQLIST_16(0x2), IRQLIST_16(0x3),
+        IRQLIST_16(0x4), IRQLIST_16(0x5), IRQLIST_16(0x6), IRQLIST_16(0x7),
+        IRQLIST_16(0x8), IRQLIST_16(0x9), IRQLIST_16(0xa), IRQLIST_16(0xb),
+        IRQLIST_16(0xc), IRQLIST_16(0xd), IRQLIST_16(0xe), IRQLIST_16(0xf)
+};
+
+#undef IRQ
+#undef IRQLIST_16
+
+
+
+
+/*
+ * IRQ2 is cascade interrupt to second interrupt controller
+ */
+
+static struct irqaction irq2 = {
+        .handler = no_action,
+        .mask = CPU_MASK_NONE,
+        .name = "cascade",
+};
+DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
+        [0 ... IRQ0_VECTOR - 1] = -1,
+        [IRQ0_VECTOR] = 0,
+        [IRQ1_VECTOR] = 1,
+        [IRQ2_VECTOR] = 2,
+        [IRQ3_VECTOR] = 3,
+        [IRQ4_VECTOR] = 4,
+        [IRQ5_VECTOR] = 5,
+        [IRQ6_VECTOR] = 6,
+        [IRQ7_VECTOR] = 7,
+        [IRQ8_VECTOR] = 8,
+        [IRQ9_VECTOR] = 9,
+        [IRQ10_VECTOR] = 10,
+        [IRQ11_VECTOR] = 11,
+        [IRQ12_VECTOR] = 12,
+        [IRQ13_VECTOR] = 13,
+        [IRQ14_VECTOR] = 14,
+        [IRQ15_VECTOR] = 15,
+        [IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
+};
+
+static void __init init_ISA_irqs (void)
+{
+        int i;
+
+        init_bsp_APIC();
+        init_8259A(0);
+
+        for (i = 0; i < NR_IRQS; i++) {
+                irq_desc[i].status = IRQ_DISABLED;
+                irq_desc[i].action = NULL;
+                irq_desc[i].depth = 1;
+
+                if (i < 16) {
+                        /*
+                         * 16 old-style INTA-cycle interrupts:
+                         */
+                        set_irq_chip_and_handler_name(i, &i8259A_chip,
+                                                      handle_level_irq, "XT");
+                } else {
+                        /*
+                         * 'high' PCI IRQs filled in on demand
+                         */
+                        irq_desc[i].chip = &no_irq_chip;
+                }
+        }
+}
+
+void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
+
+void __init native_init_IRQ(void)
+{
+        int i;
+
+        init_ISA_irqs();
+        /*
+         * Cover the whole vector space, no vector can escape
+         * us. (some of these will be overridden and become
+         * 'special' SMP interrupts)
+         */
+        for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
+                int vector = FIRST_EXTERNAL_VECTOR + i;
+                if (vector != IA32_SYSCALL_VECTOR)
+                        set_intr_gate(vector, interrupt[i]);
+        }
+
+#ifdef CONFIG_SMP
+        /*
+         * The reschedule interrupt is a CPU-to-CPU reschedule-helper
+         * IPI, driven by wakeup.
+         */
+        alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
+
+        /* IPIs for invalidation */
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
+
+        /* IPI for generic function call */
+        alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
+
+        /* IPI for generic single function call */
+        alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
+                        call_function_single_interrupt);
+
+        /* Low priority IPI to cleanup after moving an irq */
+        set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
+#endif
+        alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
+        alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
+
+        /* self generated IPI for local APIC timer */
+        alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
+
+        /* IPI vectors for APIC spurious and error interrupts */
+        alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
+        alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
+
+        if (!acpi_ioapic)
+                setup_irq(2, &irq2);
+}