1 /*****************************************************************************
2 * x86/xen/xen-os.h
3 *
4 * Random collection of macros and definition
5 *
6 * Copyright (c) 2003, 2004 Keir Fraser (on behalf of the Xen team)
7 * All rights reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to
11 * deal in the Software without restriction, including without limitation the
12 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
13 * sell copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 */
27
28 #ifndef _MACHINE_X86_XEN_XEN_OS_H_
29 #define _MACHINE_X86_XEN_XEN_OS_H_
30
31 #ifndef _XEN_XEN_OS_H_
32 #error "do not #include machine/xen/xen-os.h, #include xen/xen-os.h instead"
33 #endif
34
35 /* Shared memory needs write-back as its cache attribute for coherency. */
36 #define VM_MEMATTR_XEN VM_MEMATTR_WRITE_BACK
37
38 /* Everything below this point is not included by assembler (.S) files. */
39 #ifndef __ASSEMBLY__
40
41 #include <sys/pcpu.h>
42
43 /* If non-zero, the hypervisor has been configured to use a direct vector */
44 extern int xen_vector_callback_enabled;
45
46 /* Signal whether the event channel vector requires EOI at the lapic */
47 extern bool xen_evtchn_needs_ack;
48
49 /* tunable for disabling PV disks */
50 extern int xen_disable_pv_disks;
51
52 /* tunable for disabling PV nics */
53 extern int xen_disable_pv_nics;
54
55 /* compatibility for accessing xen_ulong_t with atomics */
56 #define atomic_clear_xen_ulong atomic_clear_long
57 #define atomic_set_xen_ulong atomic_set_long
58 #define atomic_readandclear_xen_ulong atomic_readandclear_long
59 #define atomic_testandset_xen_ulong atomic_testandset_long
60 #define atomic_load_acq_xen_ulong atomic_load_acq_long
61 #define atomic_store_rel_xen_ulong atomic_store_rel_long
62 #define atomic_set_xen_ulong atomic_set_long
63 #define atomic_clear_xen_ulong atomic_clear_long
64
65 static inline u_int
XEN_CPUID_TO_VCPUID(u_int cpuid)66 XEN_CPUID_TO_VCPUID(u_int cpuid)
67 {
68
69 return (pcpu_find(cpuid)->pc_vcpu_id);
70 }
71
72 #define XEN_VCPUID() PCPU_GET(vcpu_id)
73
74 static inline bool
xen_has_percpu_evtchn(void)75 xen_has_percpu_evtchn(void)
76 {
77
78 return (!xen_hvm_domain() || xen_vector_callback_enabled);
79 }
80
81 static inline bool
xen_pv_disks_disabled(void)82 xen_pv_disks_disabled(void)
83 {
84
85 return (xen_hvm_domain() && xen_disable_pv_disks != 0);
86 }
87
88 static inline bool
xen_pv_nics_disabled(void)89 xen_pv_nics_disabled(void)
90 {
91
92 return (xen_hvm_domain() && xen_disable_pv_nics != 0);
93 }
94
95 bool xen_has_iommu_maps(void);
96
97 /* (Very) early initialization. */
98 void xen_early_init(void);
99
100 #endif /* !__ASSEMBLY__ */
101
102 #endif /* _MACHINE_X86_XEN_XEN_OS_H_ */
103