    /* SPDX-License-Identifier: MIT */
    /******************************************************************************
     * nmi.h
     *
     * NMI callback registration and reason codes.
     *
     * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
     */

    #ifndef __XEN_PUBLIC_NMI_H__
    #define __XEN_PUBLIC_NMI_H__

    #include "xen.h"

    /*
     * NMI reason codes:
     * Currently these are x86-specific, stored in arch_shared_info.nmi_reason.
     */
     /* I/O-check error reported via ISA port 0x61, bit 6. */
    #define _XEN_NMIREASON_io_error     0
    #define XEN_NMIREASON_io_error      (1UL << _XEN_NMIREASON_io_error)
     /* PCI SERR reported via ISA port 0x61, bit 7. */
    #define _XEN_NMIREASON_pci_serr     1
    #define XEN_NMIREASON_pci_serr      (1UL << _XEN_NMIREASON_pci_serr)
    #if __XEN_INTERFACE_VERSION__ < 0x00040300 /* legacy alias of the above */
     /* Parity error reported via ISA port 0x61, bit 7. */
    #define _XEN_NMIREASON_parity_error 1
    #define XEN_NMIREASON_parity_error  (1UL << _XEN_NMIREASON_parity_error)
    #endif
     /* Unknown hardware-generated NMI. */
    #define _XEN_NMIREASON_unknown      2
    #define XEN_NMIREASON_unknown       (1UL << _XEN_NMIREASON_unknown)

    /*
     * long nmi_op(unsigned int cmd, void *arg)
     * NB. All ops return zero on success, else a negative error code.
     */

    /*
     * Register NMI callback for this (calling) VCPU. Currently this only makes
     * sense for domain 0, vcpu 0. All other callers will be returned EINVAL.
     * arg == pointer to xennmi_callback structure.
     */
    #define XENNMI_register_callback   0
    struct xennmi_callback {
        unsigned long handler_address;
        unsigned long pad;
    };
    typedef struct xennmi_callback xennmi_callback_t;
    DEFINE_XEN_GUEST_HANDLE(xennmi_callback_t);

    /*
     * Deregister NMI callback for this (calling) VCPU.
     * arg == NULL.
     */
    #define XENNMI_unregister_callback 1

    #endif /* __XEN_PUBLIC_NMI_H__ */

    /*
     * Local variables:
     * mode: C
     * c-file-style: "BSD"
     * c-basic-offset: 4
     * tab-width: 4
     * indent-tabs-mode: nil
     * End:
     */