xref: /openbmc/linux/include/xen/interface/nmi.h (revision 9e2b3e83)
1 /* SPDX-License-Identifier: MIT */
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__ */
53