34 lines
659 B
C
34 lines
659 B
C
#include <linux/init.h>
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#include <asm/x86_init.h>
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#include <asm/apic.h>
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#include <asm/xen/hypercall.h>
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#include <xen/xen.h>
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#include <xen/interface/physdev.h>
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unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
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{
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struct physdev_apic apic_op;
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int ret;
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apic_op.apic_physbase = mpc_ioapic_addr(apic);
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apic_op.reg = reg;
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ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
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if (!ret)
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return apic_op.value;
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/* fallback to return an emulated IO_APIC values */
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if (reg == 0x1)
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return 0x00170020;
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else if (reg == 0x0)
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return apic << 24;
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return 0xfd;
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}
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void __init xen_init_apic(void)
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{
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x86_io_apic_ops.read = xen_io_apic_read;
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}
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