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}

 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
10unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
11{
12	struct physdev_apic apic_op;
13	int ret;
14
15	apic_op.apic_physbase = mpc_ioapic_addr(apic);
16	apic_op.reg = reg;
17	ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
18	if (!ret)
19		return apic_op.value;
20
21	/* fallback to return an emulated IO_APIC values */
22	if (reg == 0x1)
23		return 0x00170020;
24	else if (reg == 0x0)
25		return apic << 24;
26
27	return 0xfd;
28}
29
30void __init xen_init_apic(void)
31{
32	x86_io_apic_ops.read = xen_io_apic_read;
33}