This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / i386 / kernel / apic-xen.c

diff --git a/arch/i386/kernel/apic-xen.c b/arch/i386/kernel/apic-xen.c
new file mode 100644 (file)
index 0000000..ecd4b69
--- /dev/null
+++ b/arch/i386/kernel/apic-xen.c
@@ -0,0 +1,160 @@
+/*
+ *     Local APIC handling, local APIC timers
+ *
+ *     (c) 1999, 2000 Ingo Molnar <mingo@redhat.com>
+ *
+ *     Fixes
+ *     Maciej W. Rozycki       :       Bits for genuine 82489DX APICs;
+ *                                     thanks to Eric Gilmore
+ *                                     and Rolf G. Tews
+ *                                     for testing these extensively.
+ *     Maciej W. Rozycki       :       Various updates and fixes.
+ *     Mikael Pettersson       :       Power Management for UP-APIC.
+ *     Pavel Machek and
+ *     Mikael Pettersson       :       PM converted to driver model.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/bootmem.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/mc146818rtc.h>
+#include <linux/kernel_stat.h>
+#include <linux/sysdev.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+
+#include <asm/atomic.h>
+#include <asm/smp.h>
+#include <asm/mtrr.h>
+#include <asm/mpspec.h>
+#include <asm/desc.h>
+#include <asm/arch_hooks.h>
+#include <asm/hpet.h>
+#include <asm/i8253.h>
+
+#include <mach_apic.h>
+#include <mach_apicdef.h>
+#include <mach_ipi.h>
+
+#include "io_ports.h"
+
+#ifndef CONFIG_XEN
+/*
+ * cpu_mask that denotes the CPUs that needs timer interrupt coming in as
+ * IPIs in place of local APIC timers
+ */
+static cpumask_t timer_bcast_ipi;
+#endif
+
+/*
+ * Knob to control our willingness to enable the local APIC.
+ */
+int enable_local_apic __initdata = 0; /* -1=force-disable, +1=force-enable */
+
+/*
+ * Debug level
+ */
+int apic_verbosity;
+
+int modern_apic(void)
+{
+#ifndef CONFIG_XEN
+       unsigned int lvr, version;
+       /* AMD systems use old APIC versions, so check the CPU */
+       if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+               boot_cpu_data.x86 >= 0xf)
+               return 1;
+       lvr = apic_read(APIC_LVR);
+       version = GET_APIC_VERSION(lvr);
+       return version >= 0x14;
+#else
+       return 1;
+#endif
+}
+
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+       printk("unexpected IRQ trap at vector %02x\n", irq);
+       /*
+        * Currently unexpected vectors happen only on SMP and APIC.
+        * We _must_ ack these because every local APIC has only N
+        * irq slots per priority level, and a 'hanging, unacked' IRQ
+        * holds up an irq slot - in excessive cases (when multiple
+        * unexpected vectors occur) that might lock up the APIC
+        * completely.
+        * But only ack when the APIC is enabled -AK
+        */
+       if (cpu_has_apic)
+               ack_APIC_irq();
+}
+
+int get_physical_broadcast(void)
+{
+       if (modern_apic())
+               return 0xff;
+       else
+               return 0xf;
+}
+
+#ifndef CONFIG_XEN
+#ifndef CONFIG_SMP
+static void up_apic_timer_interrupt_call(struct pt_regs *regs)
+{
+       int cpu = smp_processor_id();
+
+       /*
+        * the NMI deadlock-detector uses this.
+        */
+       per_cpu(irq_stat, cpu).apic_timer_irqs++;
+
+       smp_local_timer_interrupt(regs);
+}
+#endif
+
+void smp_send_timer_broadcast_ipi(struct pt_regs *regs)
+{
+       cpumask_t mask;
+
+       cpus_and(mask, cpu_online_map, timer_bcast_ipi);
+       if (!cpus_empty(mask)) {
+#ifdef CONFIG_SMP
+               send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
+#else
+               /*
+                * We can directly call the apic timer interrupt handler
+                * in UP case. Minus all irq related functions
+                */
+               up_apic_timer_interrupt_call(regs);
+#endif
+       }
+}
+#endif
+
+int setup_profiling_timer(unsigned int multiplier)
+{
+       return -EINVAL;
+}
+
+/*
+ * This initializes the IO-APIC and APIC hardware if this is
+ * a UP kernel.
+ */
+int __init APIC_init_uniprocessor (void)
+{
+#ifdef CONFIG_X86_IO_APIC
+       if (smp_found_config)
+               if (!skip_ioapic_setup && nr_ioapics)
+                       setup_IO_APIC();
+#endif
+
+       return 0;
+}