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. Only 55 * | | present in version 1 and newer of the structure. 56 * | | Zero if there is no memory map being provided. 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 it's starting. E820_TYPE_xxx, for example. 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: 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 * C representation of the x86/HVM start info layout. 107 * 108 * The canonical definition of this layout is above, this is just a way to 109 * represent the layout described there using C types. 110 */ 111 struct hvm_start_info { 112 uint32_t magic; /* Contains the magic value 0x336ec578 */ 113 /* ("xEn3" with the 0x80 bit of the "E" set).*/ 114 uint32_t version; /* Version of this structure. */ 115 uint32_t flags; /* SIF_xxx flags. */ 116 uint32_t nr_modules; /* Number of modules passed to the kernel. */ 117 uint64_t modlist_paddr; /* Physical address of an array of */ 118 /* hvm_modlist_entry. */ 119 uint64_t cmdline_paddr; /* Physical address of the command line. */ 120 uint64_t rsdp_paddr; /* Physical address of the RSDP ACPI data */ 121 /* structure. */ 122 uint64_t memmap_paddr; /* Physical address of an array of */ 123 /* hvm_memmap_table_entry. Only present in */ 124 /* version 1 and newer of the structure */ 125 uint32_t memmap_entries; /* Number of entries in the memmap table. */ 126 /* Only present in version 1 and newer of */ 127 /* the structure. Value will be zero if */ 128 /* there is no memory map being provided. */ 129 uint32_t reserved; 130 }; 131 132 struct hvm_modlist_entry { 133 uint64_t paddr; /* Physical address of the module. */ 134 uint64_t size; /* Size of the module in bytes. */ 135 uint64_t cmdline_paddr; /* Physical address of the command line. */ 136 uint64_t reserved; 137 }; 138 139 struct hvm_memmap_table_entry { 140 uint64_t addr; /* Base address of the memory region */ 141 uint64_t size; /* Size of the memory region in bytes */ 142 uint32_t type; /* Mapping type */ 143 uint32_t reserved; 144 }; 145 146 #endif /* XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H */ 147