iPXE
features.h
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1 /******************************************************************************
2  * features.h
3  *
4  * Feature flags, reported by XENVER_get_features.
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) 2006, Keir Fraser <keir@xensource.com>
25  */
26 
27 #ifndef __XEN_PUBLIC_FEATURES_H__
28 #define __XEN_PUBLIC_FEATURES_H__
29 
30 FILE_LICENCE ( MIT );
31 
32 /*
33  * `incontents 200 elfnotes_features XEN_ELFNOTE_FEATURES
34  *
35  * The list of all the features the guest supports. They are set by
36  * parsing the XEN_ELFNOTE_FEATURES and XEN_ELFNOTE_SUPPORTED_FEATURES
37  * string. The format is the feature names (as given here without the
38  * "XENFEAT_" prefix) separated by '|' characters.
39  * If a feature is required for the kernel to function then the feature name
40  * must be preceded by a '!' character.
41  *
42  * Note that if XEN_ELFNOTE_SUPPORTED_FEATURES is used, then in the
43  * XENFEAT_dom0 MUST be set if the guest is to be booted as dom0,
44  */
45 
46 /*
47  * If set, the guest does not need to write-protect its pagetables, and can
48  * update them via direct writes.
49  */
50 #define XENFEAT_writable_page_tables 0
51 
52 /*
53  * If set, the guest does not need to write-protect its segment descriptor
54  * tables, and can update them via direct writes.
55  */
56 #define XENFEAT_writable_descriptor_tables 1
57 
58 /*
59  * If set, translation between the guest's 'pseudo-physical' address space
60  * and the host's machine address space are handled by the hypervisor. In this
61  * mode the guest does not need to perform phys-to/from-machine translations
62  * when performing page table operations.
63  */
64 #define XENFEAT_auto_translated_physmap 2
65 
66 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
67 #define XENFEAT_supervisor_mode_kernel 3
68 
69 /*
70  * If set, the guest does not need to allocate x86 PAE page directories
71  * below 4GB. This flag is usually implied by auto_translated_physmap.
72  */
73 #define XENFEAT_pae_pgdir_above_4gb 4
74 
75 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
76 #define XENFEAT_mmu_pt_update_preserve_ad 5
77 
78 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */
79 #define XENFEAT_highmem_assist 6
80 
81 /*
82  * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
83  * available pte bits.
84  */
85 #define XENFEAT_gnttab_map_avail_bits 7
86 
87 /* x86: Does this Xen host support the HVM callback vector type? */
88 #define XENFEAT_hvm_callback_vector 8
89 
90 /* x86: pvclock algorithm is safe to use on HVM */
91 #define XENFEAT_hvm_safe_pvclock 9
92 
93 /* x86: pirq can be used by HVM guests */
94 #define XENFEAT_hvm_pirqs 10
95 
96 /* operation as Dom0 is supported */
97 #define XENFEAT_dom0 11
98 
99 #define XENFEAT_NR_SUBMAPS 1
100 
101 #endif /* __XEN_PUBLIC_FEATURES_H__ */
102 
103 /*
104  * Local variables:
105  * mode: C
106  * c-file-style: "BSD"
107  * c-basic-offset: 4
108  * tab-width: 4
109  * indent-tabs-mode: nil
110  * End:
111  */
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)