include/xen/interface/hvm/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 0. 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  *
  52  * The layout of each entry in the module structure is the following:
  53  *
  54  *  0 +----------------+
  55  *    | paddr          | Physical address of the module.
  56  *  8 +----------------+
  57  *    | size           | Size of the module in bytes.
  58  * 16 +----------------+
  59  *    | cmdline_paddr  | Physical address of the command line,
  60  *    |                | a zero-terminated ASCII string.
  61  * 24 +----------------+
  62  *    | reserved       |
  63  * 32 +----------------+
  64  *
  65  * The address and sizes are always a 64bit little endian unsigned integer.
  66  *
  67  * NB: Xen on x86 will always try to place all the data below the 4GiB
  68  * boundary.
  69  */
  70 #define XEN_HVM_START_MAGIC_VALUE 0x336ec578
  71
  72 /*
  73  * C representation of the x86/HVM start info layout.
  74  *
  75  * The canonical definition of this layout is above, this is just a way to
  76  * represent the layout described there using C types.
  77  */
  78 struct hvm_start_info {
  79     uint32_t magic;             /* Contains the magic value 0x336ec578       */
  80                                 /* ("xEn3" with the 0x80 bit of the "E" set).*/
  81     uint32_t version;           /* Version of this structure.                */
  82     uint32_t flags;             /* SIF_xxx flags.                            */
  83     uint32_t nr_modules;        /* Number of modules passed to the kernel.   */
  84     uint64_t modlist_paddr;     /* Physical address of an array of           */
  85                                 /* hvm_modlist_entry.                        */
  86     uint64_t cmdline_paddr;     /* Physical address of the command line.     */
  87     uint64_t rsdp_paddr;        /* Physical address of the RSDP ACPI data    */
  88                                 /* structure.                                */
  89 };
  90
  91 struct hvm_modlist_entry {
  92     uint64_t paddr;             /* Physical address of the module.           */
  93     uint64_t size;              /* Size of the module in bytes.              */
  94     uint64_t cmdline_paddr;     /* Physical address of the command line.     */
  95     uint64_t reserved;
  96 };
  97
  98 #endif /* __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__ */