1 /*
2 * Permission is hereby granted, free of charge, to any person obtaining a copy
3 * of this software and associated documentation files (the "Software"), to
4 * deal in the Software without restriction, including without limitation the
5 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
6 * sell copies of the Software, and to permit persons to whom the Software is
7 * furnished to do so, subject to the following conditions:
8 *
9 * The above copyright notice and this permission notice shall be included in
10 * all copies or substantial portions of the Software.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
15 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
17 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
18 * DEALINGS IN THE SOFTWARE.
19 *
20 * Copyright (c) 2016, Citrix Systems, Inc.
21 */
22
23 #ifndef __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__
24 #define __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__
25
26 /*
27 * Start of day structure passed to PVH guests and to HVM guests in %ebx.
28 *
29 * NOTE: nothing will be loaded at physical address 0, so a 0 value in any
30 * of the address fields should be treated as not present.
31 *
32 * 0 +----------------+
33 * | magic | Contains the magic value XEN_HVM_START_MAGIC_VALUE
34 * | | ("xEn3" with the 0x80 bit of the "E" set).
35 * 4 +----------------+
36 * | version | Version of this structure. Current version is 1. New
37 * | | versions are guaranteed to be backwards-compatible.
38 * 8 +----------------+
39 * | flags | SIF_xxx flags.
40 * 12 +----------------+
41 * | nr_modules | Number of modules passed to the kernel.
42 * 16 +----------------+
43 * | modlist_paddr | Physical address of an array of modules
44 * | | (layout of the structure below).
45 * 24 +----------------+
46 * | cmdline_paddr | Physical address of the command line,
47 * | | a zero-terminated ASCII string.
48 * 32 +----------------+
49 * | rsdp_paddr | Physical address of the RSDP ACPI data structure.
50 * 40 +----------------+
51 * | memmap_paddr | Physical address of the (optional) memory map. Only
52 * | | present in version 1 and newer of the structure.
53 * 48 +----------------+
54 * | memmap_entries | Number of entries in the memory map table. Zero
55 * | | if there is no memory map being provided. Only
56 * | | present in version 1 and newer of the structure.
57 * 52 +----------------+
58 * | reserved | Version 1 and newer only.
59 * 56 +----------------+
60 *
61 * The layout of each entry in the module structure is the following:
62 *
63 * 0 +----------------+
64 * | paddr | Physical address of the module.
65 * 8 +----------------+
66 * | size | Size of the module in bytes.
67 * 16 +----------------+
68 * | cmdline_paddr | Physical address of the command line,
69 * | | a zero-terminated ASCII string.
70 * 24 +----------------+
71 * | reserved |
72 * 32 +----------------+
73 *
74 * The layout of each entry in the memory map table is as follows:
75 *
76 * 0 +----------------+
77 * | addr | Base address
78 * 8 +----------------+
79 * | size | Size of mapping in bytes
80 * 16 +----------------+
81 * | type | Type of mapping as defined between the hypervisor
82 * | | and guest. See XEN_HVM_MEMMAP_TYPE_* values below.
83 * 20 +----------------|
84 * | reserved |
85 * 24 +----------------+
86 *
87 * The address and sizes are always a 64bit little endian unsigned integer.
88 *
89 * NB: Xen on x86 will always try to place all the data below the 4GiB
90 * boundary.
91 *
92 * Version numbers of the hvm_start_info structure have evolved like this:
93 *
94 * Version 0: Initial implementation.
95 *
96 * Version 1: Added the memmap_paddr/memmap_entries fields (plus 4 bytes of
97 * padding) to the end of the hvm_start_info struct. These new
98 * fields can be used to pass a memory map to the guest. The
99 * memory map is optional and so guests that understand version 1
100 * of the structure must check that memmap_entries is non-zero
101 * before trying to read the memory map.
102 */
103 #define XEN_HVM_START_MAGIC_VALUE 0x336ec578
104
105 /*
106 * The values used in the type field of the memory map table entries are
107 * defined below and match the Address Range Types as defined in the "System
108 * Address Map Interfaces" section of the ACPI Specification. Please refer to
109 * section 15 in version 6.2 of the ACPI spec: http://uefi.org/specifications
110 */
111 #define XEN_HVM_MEMMAP_TYPE_RAM 1
112 #define XEN_HVM_MEMMAP_TYPE_RESERVED 2
113 #define XEN_HVM_MEMMAP_TYPE_ACPI 3
114 #define XEN_HVM_MEMMAP_TYPE_NVS 4
115 #define XEN_HVM_MEMMAP_TYPE_UNUSABLE 5
116 #define XEN_HVM_MEMMAP_TYPE_DISABLED 6
117 #define XEN_HVM_MEMMAP_TYPE_PMEM 7
118
119 /*
120 * C representation of the x86/HVM start info layout.
121 *
122 * The canonical definition of this layout is above, this is just a way to
123 * represent the layout described there using C types.
124 */
125 struct hvm_start_info {
126 uint32_t magic; /* Contains the magic value 0x336ec578 */
127 /* ("xEn3" with the 0x80 bit of the "E" set).*/
128 uint32_t version; /* Version of this structure. */
129 uint32_t flags; /* SIF_xxx flags. */
130 uint32_t nr_modules; /* Number of modules passed to the kernel. */
131 uint64_t modlist_paddr; /* Physical address of an array of */
132 /* hvm_modlist_entry. */
133 uint64_t cmdline_paddr; /* Physical address of the command line. */
134 uint64_t rsdp_paddr; /* Physical address of the RSDP ACPI data */
135 /* structure. */
136 /* All following fields only present in version 1 and newer */
137 uint64_t memmap_paddr; /* Physical address of an array of */
138 /* hvm_memmap_table_entry. */
139 uint32_t memmap_entries; /* Number of entries in the memmap table. */
140 /* Value will be zero if there is no memory */
141 /* map being provided. */
142 uint32_t reserved; /* Must be zero. */
143 };
144
145 struct hvm_modlist_entry {
146 uint64_t paddr; /* Physical address of the module. */
147 uint64_t size; /* Size of the module in bytes. */
148 uint64_t cmdline_paddr; /* Physical address of the command line. */
149 uint64_t reserved;
150 };
151
152 struct hvm_memmap_table_entry {
153 uint64_t addr; /* Base address of the memory region */
154 uint64_t size; /* Size of the memory region in bytes */
155 uint32_t type; /* Mapping type */
156 uint32_t reserved; /* Must be zero for Version 1. */
157 };
158
159 #endif /* __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__ */