LXR linux/arch/x86/xen/apic.c

   1#include <linux/init.h>
   2
   3#include <asm/x86_init.h>
   4#include <asm/apic.h>
   5#include <asm/xen/hypercall.h>
   6
   7#include <xen/xen.h>
   8#include <xen/interface/physdev.h>
   9#include "xen-ops.h"
  10
  11static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
  12{
  13        struct physdev_apic apic_op;
  14        int ret;
  15
  16        apic_op.apic_physbase = mpc_ioapic_addr(apic);
  17        apic_op.reg = reg;
  18        ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
  19        if (!ret)
  20                return apic_op.value;
  21
  22        /* fallback to return an emulated IO_APIC values */
  23        if (reg == 0x1)
  24                return 0x00170020;
  25        else if (reg == 0x0)
  26                return apic << 24;
  27
  28        return 0xfd;
  29}
  30
  31void __init xen_init_apic(void)
  32{
  33        x86_io_apic_ops.read = xen_io_apic_read;
  34}
  35