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.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 #if __XEN_INTERFACE_VERSION__ < 0x00040300 /* legacy alias of the above */
26  /* Parity error reported via ISA port 0x61, bit 7. */
27 #define _XEN_NMIREASON_parity_error 1
28 #define XEN_NMIREASON_parity_error  (1UL << _XEN_NMIREASON_parity_error)
29 #endif
30  /* Unknown hardware-generated NMI. */
31 #define _XEN_NMIREASON_unknown      2
32 #define XEN_NMIREASON_unknown       (1UL << _XEN_NMIREASON_unknown)
33 
34 /*
35  * long nmi_op(unsigned int cmd, void *arg)
36  * NB. All ops return zero on success, else a negative error code.
37  */
38 
39 /*
40  * Register NMI callback for this (calling) VCPU. Currently this only makes
41  * sense for domain 0, vcpu 0. All other callers will be returned EINVAL.
42  * arg == pointer to xennmi_callback structure.
43  */
44 #define XENNMI_register_callback   0
45 struct xennmi_callback {
46     unsigned long handler_address;
47     unsigned long pad;
48 };
49 typedef struct xennmi_callback xennmi_callback_t;
50 DEFINE_XEN_GUEST_HANDLE(xennmi_callback_t);
51 
52 /*
53  * Deregister NMI callback for this (calling) VCPU.
54  * arg == NULL.
55  */
56 #define XENNMI_unregister_callback 1
57 
58 #endif /* __XEN_PUBLIC_NMI_H__ */
59 
60 /*
61  * Local variables:
62  * mode: C
63  * c-file-style: "BSD"
64  * c-basic-offset: 4
65  * tab-width: 4
66  * indent-tabs-mode: nil
67  * End:
68  */
69