1 /* SPDX-License-Identifier: GPL-2.0 */
2 /******************************************************************************
3 * nmi.h
4 *
5 * NMI callback registration and reason codes.
6 *
7 * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
8 */
9
10 #ifndef __XEN_PUBLIC_NMI_H__
11 #define __XEN_PUBLIC_NMI_H__
12
13 #include <xen/interface/xen.h>
14
15 /*
16 * NMI reason codes:
17 * Currently these are x86-specific, stored in arch_shared_info.nmi_reason.
18 */
19 /* I/O-check error reported via ISA port 0x61, bit 6. */
20 #define _XEN_NMIREASON_io_error 0
21 #define XEN_NMIREASON_io_error (1UL << _XEN_NMIREASON_io_error)
22 /* PCI SERR reported via ISA port 0x61, bit 7. */
23 #define _XEN_NMIREASON_pci_serr 1
24 #define XEN_NMIREASON_pci_serr (1UL << _XEN_NMIREASON_pci_serr)
25 /* Unknown hardware-generated NMI. */
26 #define _XEN_NMIREASON_unknown 2
27 #define XEN_NMIREASON_unknown (1UL << _XEN_NMIREASON_unknown)
28
29 /*
30 * long nmi_op(unsigned int cmd, void *arg)
31 * NB. All ops return zero on success, else a negative error code.
32 */
33
34 /*
35 * Register NMI callback for this (calling) VCPU. Currently this only makes
36 * sense for domain 0, vcpu 0. All other callers will be returned EINVAL.
37 * arg == pointer to xennmi_callback structure.
38 */
39 #define XENNMI_register_callback 0
40 struct xennmi_callback {
41 unsigned long handler_address;
42 unsigned long pad;
43 };
44 DEFINE_GUEST_HANDLE_STRUCT(xennmi_callback);
45
46 /*
47 * Deregister NMI callback for this (calling) VCPU.
48 * arg == NULL.
49 */
50 #define XENNMI_unregister_callback 1
51
52 #endif /* __XEN_PUBLIC_NMI_H__ */