/root/src/xen/xen/include/public/arch-x86/cpuid.h
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1 | | /****************************************************************************** |
2 | | * arch-x86/cpuid.h |
3 | | * |
4 | | * CPUID interface to Xen. |
5 | | * |
6 | | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | | * of this software and associated documentation files (the "Software"), to |
8 | | * deal in the Software without restriction, including without limitation the |
9 | | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
10 | | * sell copies of the Software, and to permit persons to whom the Software is |
11 | | * furnished to do so, subject to the following conditions: |
12 | | * |
13 | | * The above copyright notice and this permission notice shall be included in |
14 | | * all copies or substantial portions of the Software. |
15 | | * |
16 | | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
19 | | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
20 | | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
21 | | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
22 | | * DEALINGS IN THE SOFTWARE. |
23 | | * |
24 | | * Copyright (c) 2007 Citrix Systems, Inc. |
25 | | * |
26 | | * Authors: |
27 | | * Keir Fraser <keir@xen.org> |
28 | | */ |
29 | | |
30 | | #ifndef __XEN_PUBLIC_ARCH_X86_CPUID_H__ |
31 | | #define __XEN_PUBLIC_ARCH_X86_CPUID_H__ |
32 | | |
33 | | /* |
34 | | * For compatibility with other hypervisor interfaces, the Xen cpuid leaves |
35 | | * can be found at the first otherwise unused 0x100 aligned boundary starting |
36 | | * from 0x40000000. |
37 | | * |
38 | | * e.g If viridian extensions are enabled for an HVM domain, the Xen cpuid |
39 | | * leaves will start at 0x40000100 |
40 | | */ |
41 | | |
42 | | #define XEN_CPUID_FIRST_LEAF 0x40000000 |
43 | | #define XEN_CPUID_LEAF(i) (XEN_CPUID_FIRST_LEAF + (i)) |
44 | | |
45 | | /* |
46 | | * Leaf 1 (0x40000x00) |
47 | | * EAX: Largest Xen-information leaf. All leaves up to an including @EAX |
48 | | * are supported by the Xen host. |
49 | | * EBX-EDX: "XenVMMXenVMM" signature, allowing positive identification |
50 | | * of a Xen host. |
51 | | */ |
52 | 4 | #define XEN_CPUID_SIGNATURE_EBX 0x566e6558 /* "XenV" */ |
53 | 4 | #define XEN_CPUID_SIGNATURE_ECX 0x65584d4d /* "MMXe" */ |
54 | 4 | #define XEN_CPUID_SIGNATURE_EDX 0x4d4d566e /* "nVMM" */ |
55 | | |
56 | | /* |
57 | | * Leaf 2 (0x40000x01) |
58 | | * EAX[31:16]: Xen major version. |
59 | | * EAX[15: 0]: Xen minor version. |
60 | | * EBX-EDX: Reserved (currently all zeroes). |
61 | | */ |
62 | | |
63 | | /* |
64 | | * Leaf 3 (0x40000x02) |
65 | | * EAX: Number of hypercall transfer pages. This register is always guaranteed |
66 | | * to specify one hypercall page. |
67 | | * EBX: Base address of Xen-specific MSRs. |
68 | | * ECX: Features 1. Unused bits are set to zero. |
69 | | * EDX: Features 2. Unused bits are set to zero. |
70 | | */ |
71 | | |
72 | | /* Does the host support MMU_PT_UPDATE_PRESERVE_AD for this guest? */ |
73 | | #define _XEN_CPUID_FEAT1_MMU_PT_UPDATE_PRESERVE_AD 0 |
74 | 0 | #define XEN_CPUID_FEAT1_MMU_PT_UPDATE_PRESERVE_AD (1u<<0) |
75 | | |
76 | | /* |
77 | | * Leaf 4 (0x40000x03) |
78 | | * Sub-leaf 0: EAX: bit 0: emulated tsc |
79 | | * bit 1: host tsc is known to be reliable |
80 | | * bit 2: RDTSCP instruction available |
81 | | * EBX: tsc_mode: 0=default (emulate if necessary), 1=emulate, |
82 | | * 2=no emulation, 3=no emulation + TSC_AUX support |
83 | | * ECX: guest tsc frequency in kHz |
84 | | * EDX: guest tsc incarnation (migration count) |
85 | | * Sub-leaf 1: EAX: tsc offset low part |
86 | | * EBX: tsc offset high part |
87 | | * ECX: multiplicator for tsc->ns conversion |
88 | | * EDX: shift amount for tsc->ns conversion |
89 | | * Sub-leaf 2: EAX: host tsc frequency in kHz |
90 | | */ |
91 | | |
92 | | /* |
93 | | * Leaf 5 (0x40000x04) |
94 | | * HVM-specific features |
95 | | * Sub-leaf 0: EAX: Features |
96 | | * Sub-leaf 0: EBX: vcpu id (iff EAX has XEN_HVM_CPUID_VCPU_ID_PRESENT flag) |
97 | | */ |
98 | 0 | #define XEN_HVM_CPUID_APIC_ACCESS_VIRT (1u << 0) /* Virtualized APIC registers */ |
99 | 0 | #define XEN_HVM_CPUID_X2APIC_VIRT (1u << 1) /* Virtualized x2APIC accesses */ |
100 | | /* Memory mapped from other domains has valid IOMMU entries */ |
101 | 0 | #define XEN_HVM_CPUID_IOMMU_MAPPINGS (1u << 2) |
102 | 0 | #define XEN_HVM_CPUID_VCPU_ID_PRESENT (1u << 3) /* vcpu id is present in EBX */ |
103 | | |
104 | | /* |
105 | | * Leaf 6 (0x40000x05) |
106 | | * PV-specific parameters |
107 | | * Sub-leaf 0: EAX: max available sub-leaf |
108 | | * Sub-leaf 0: EBX: bits 0-7: max machine address width |
109 | | */ |
110 | | |
111 | | /* Max. address width in bits taking memory hotplug into account. */ |
112 | | #define XEN_CPUID_MACHINE_ADDRESS_WIDTH_MASK (0xffu << 0) |
113 | | |
114 | 9 | #define XEN_CPUID_MAX_NUM_LEAVES 5 |
115 | | |
116 | | #endif /* __XEN_PUBLIC_ARCH_X86_CPUID_H__ */ |