1 /****************************************************************************** 2 * elfnote.h 3 * 4 * Definitions used for the Xen ELF notes. 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, Ian Campbell, XenSource Ltd. 25 */ 26 27 #ifndef __XEN_PUBLIC_ELFNOTE_H__ 28 #define __XEN_PUBLIC_ELFNOTE_H__ 29 30 /* 31 * The notes should live in a SHT_NOTE segment and have "Xen" in the 32 * name field. 33 * 34 * Numeric types are either 4 or 8 bytes depending on the content of 35 * the desc field. 36 * 37 * LEGACY indicated the fields in the legacy __xen_guest string which 38 * this a note type replaces. 39 * 40 * String values (for non-legacy) are NULL terminated ASCII, also known 41 * as ASCIZ type. 42 */ 43 44 /* 45 * NAME=VALUE pair (string). 46 */ 47 #define XEN_ELFNOTE_INFO 0 48 49 /* 50 * The virtual address of the entry point (numeric). 51 * 52 * LEGACY: VIRT_ENTRY 53 */ 54 #define XEN_ELFNOTE_ENTRY 1 55 56 /* The virtual address of the hypercall transfer page (numeric). 57 * 58 * LEGACY: HYPERCALL_PAGE. (n.b. legacy value is a physical page 59 * number not a virtual address) 60 */ 61 #define XEN_ELFNOTE_HYPERCALL_PAGE 2 62 63 /* The virtual address where the kernel image should be mapped (numeric). 64 * 65 * Defaults to 0. 66 * 67 * LEGACY: VIRT_BASE 68 */ 69 #define XEN_ELFNOTE_VIRT_BASE 3 70 71 /* 72 * The offset of the ELF paddr field from the acutal required 73 * pseudo-physical address (numeric). 74 * 75 * This is used to maintain backwards compatibility with older kernels 76 * which wrote __PAGE_OFFSET into that field. This field defaults to 0 77 * if not present. 78 * 79 * LEGACY: ELF_PADDR_OFFSET. (n.b. legacy default is VIRT_BASE) 80 */ 81 #define XEN_ELFNOTE_PADDR_OFFSET 4 82 83 /* 84 * The version of Xen that we work with (string). 85 * 86 * LEGACY: XEN_VER 87 */ 88 #define XEN_ELFNOTE_XEN_VERSION 5 89 90 /* 91 * The name of the guest operating system (string). 92 * 93 * LEGACY: GUEST_OS 94 */ 95 #define XEN_ELFNOTE_GUEST_OS 6 96 97 /* 98 * The version of the guest operating system (string). 99 * 100 * LEGACY: GUEST_VER 101 */ 102 #define XEN_ELFNOTE_GUEST_VERSION 7 103 104 /* 105 * The loader type (string). 106 * 107 * LEGACY: LOADER 108 */ 109 #define XEN_ELFNOTE_LOADER 8 110 111 /* 112 * The kernel supports PAE (x86/32 only, string = "yes" or "no"). 113 * 114 * LEGACY: PAE (n.b. The legacy interface included a provision to 115 * indicate 'extended-cr3' support allowing L3 page tables to be 116 * placed above 4G. It is assumed that any kernel new enough to use 117 * these ELF notes will include this and therefore "yes" here is 118 * equivalent to "yes[entended-cr3]" in the __xen_guest interface. 119 */ 120 #define XEN_ELFNOTE_PAE_MODE 9 121 122 /* 123 * The features supported/required by this kernel (string). 124 * 125 * The string must consist of a list of feature names (as given in 126 * features.h, without the "XENFEAT_" prefix) separated by '|' 127 * characters. If a feature is required for the kernel to function 128 * then the feature name must be preceded by a '!' character. 129 * 130 * LEGACY: FEATURES 131 */ 132 #define XEN_ELFNOTE_FEATURES 10 133 134 /* 135 * The kernel requires the symbol table to be loaded (string = "yes" or "no") 136 * LEGACY: BSD_SYMTAB (n.b. The legacy treated the presence or absence 137 * of this string as a boolean flag rather than requiring "yes" or 138 * "no". 139 */ 140 #define XEN_ELFNOTE_BSD_SYMTAB 11 141 142 /* 143 * The lowest address the hypervisor hole can begin at (numeric). 144 * 145 * This must not be set higher than HYPERVISOR_VIRT_START. Its presence 146 * also indicates to the hypervisor that the kernel can deal with the 147 * hole starting at a higher address. 148 */ 149 #define XEN_ELFNOTE_HV_START_LOW 12 150 151 /* 152 * List of maddr_t-sized mask/value pairs describing how to recognize 153 * (non-present) L1 page table entries carrying valid MFNs (numeric). 154 */ 155 #define XEN_ELFNOTE_L1_MFN_VALID 13 156 157 /* 158 * Whether or not the guest supports cooperative suspend cancellation. 159 * This is a numeric value. 160 * 161 * Default is 0 162 */ 163 #define XEN_ELFNOTE_SUSPEND_CANCEL 14 164 165 /* 166 * The (non-default) location the initial phys-to-machine map should be 167 * placed at by the hypervisor (Dom0) or the tools (DomU). 168 * The kernel must be prepared for this mapping to be established using 169 * large pages, despite such otherwise not being available to guests. 170 * The kernel must also be able to handle the page table pages used for 171 * this mapping not being accessible through the initial mapping. 172 * (Only x86-64 supports this at present.) 173 */ 174 #define XEN_ELFNOTE_INIT_P2M 15 175 176 /* 177 * Whether or not the guest can deal with being passed an initrd not 178 * mapped through its initial page tables. 179 */ 180 #define XEN_ELFNOTE_MOD_START_PFN 16 181 182 /* 183 * The features supported by this kernel (numeric). 184 * 185 * Other than XEN_ELFNOTE_FEATURES on pre-4.2 Xen, this note allows a 186 * kernel to specify support for features that older hypervisors don't 187 * know about. The set of features 4.2 and newer hypervisors will 188 * consider supported by the kernel is the combination of the sets 189 * specified through this and the string note. 190 * 191 * LEGACY: FEATURES 192 */ 193 #define XEN_ELFNOTE_SUPPORTED_FEATURES 17 194 195 /* 196 * The number of the highest elfnote defined. 197 */ 198 #define XEN_ELFNOTE_MAX XEN_ELFNOTE_SUPPORTED_FEATURES 199 200 #endif /* __XEN_PUBLIC_ELFNOTE_H__ */ 201 202 /* 203 * Local variables: 204 * mode: C 205 * c-set-style: "BSD" 206 * c-basic-offset: 4 207 * tab-width: 4 208 * indent-tabs-mode: nil 209 * End: 210 */ 211