include/hw/xen/start_info.h

   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 */