apic.c

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#include <linux/init.h>

#include <asm/x86_init.h>
#include <asm/apic.h>
#include <asm/xen/hypercall.h>

#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include "xen-ops.h"

static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
{
    struct physdev_apic apic_op;
    int ret;

    apic_op.apic_physbase = mpc_ioapic_addr(apic);
    apic_op.reg = reg;
    ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
    if (!ret)
        return apic_op.value;

    /* fallback to return an emulated IO_APIC values */
    if (reg == 0x1)
        return 0x00170020;
    else if (reg == 0x0)
        return apic << 24;

    return 0xfd;
}

void __init xen_init_apic(void)
{
    x86_io_apic_ops.read = xen_io_apic_read;
}