ArmPkg/Application/LinuxLoader/Arm/LinuxAtag.h

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2015, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #ifndef __LINUX_ATAG_H__
  16 #define __LINUX_ATAG_H__
  17
  18 //
  19 // ATAG Definitions
  20 //
  21
  22 #define ATAG_MAX_SIZE        0x3000
  23
  24 /* ATAG : list of possible tags */
  25 #define ATAG_NONE            0x00000000
  26 #define ATAG_CORE            0x54410001
  27 #define ATAG_MEM             0x54410002
  28 #define ATAG_VIDEOTEXT       0x54410003
  29 #define ATAG_RAMDISK         0x54410004
  30 #define ATAG_INITRD2         0x54420005
  31 #define ATAG_SERIAL          0x54410006
  32 #define ATAG_REVISION        0x54410007
  33 #define ATAG_VIDEOLFB        0x54410008
  34 #define ATAG_CMDLINE         0x54410009
  35 #define ATAG_ARM_MP_CORE     0x5441000A
  36
  37 #define next_tag_address(t)  ((LINUX_ATAG*)((UINT32)(t) + (((t)->header.size) << 2) ))
  38 #define tag_size(type)       ((UINT32)((sizeof(LINUX_ATAG_HEADER) + sizeof(type)) >> 2))
  39
  40 typedef struct {
  41   UINT32  size; /* length of tag in words including this header */
  42   UINT32  type;  /* tag type */
  43 } LINUX_ATAG_HEADER;
  44
  45 typedef struct {
  46   UINT32  flags;
  47   UINT32  pagesize;
  48   UINT32  rootdev;
  49 } LINUX_ATAG_CORE;
  50
  51 typedef struct {
  52   UINT32  size;
  53   UINTN  start;
  54 } LINUX_ATAG_MEM;
  55
  56 typedef struct {
  57   UINT8   x;
  58   UINT8   y;
  59   UINT16  video_page;
  60   UINT8   video_mode;
  61   UINT8   video_cols;
  62   UINT16  video_ega_bx;
  63   UINT8   video_lines;
  64   UINT8   video_isvga;
  65   UINT16  video_points;
  66 } LINUX_ATAG_VIDEOTEXT;
  67
  68 typedef struct {
  69   UINT32  flags;
  70   UINT32  size;
  71   UINTN  start;
  72 } LINUX_ATAG_RAMDISK;
  73
  74 typedef struct {
  75   UINT32  start;
  76   UINT32  size;
  77 } LINUX_ATAG_INITRD2;
  78
  79 typedef struct {
  80   UINT32  low;
  81   UINT32  high;
  82 } LINUX_ATAG_SERIALNR;
  83
  84 typedef struct {
  85   UINT32  rev;
  86 } LINUX_ATAG_REVISION;
  87
  88 typedef struct {
  89   UINT16  lfb_width;
  90   UINT16  lfb_height;
  91   UINT16  lfb_depth;
  92   UINT16  lfb_linelength;
  93   UINT32  lfb_base;
  94   UINT32  lfb_size;
  95   UINT8   red_size;
  96   UINT8   red_pos;
  97   UINT8   green_size;
  98   UINT8   green_pos;
  99   UINT8   blue_size;
 100   UINT8   blue_pos;
 101   UINT8   rsvd_size;
 102   UINT8   rsvd_pos;
 103 } LINUX_ATAG_VIDEOLFB;
 104
 105 typedef struct {
 106   CHAR8   cmdline[1];
 107 } LINUX_ATAG_CMDLINE;
 108
 109 typedef struct {
 110   LINUX_ATAG_HEADER header;
 111   union {
 112     LINUX_ATAG_CORE         core_tag;
 113     LINUX_ATAG_MEM          mem_tag;
 114     LINUX_ATAG_VIDEOTEXT    videotext_tag;
 115     LINUX_ATAG_RAMDISK      ramdisk_tag;
 116     LINUX_ATAG_INITRD2      initrd2_tag;
 117     LINUX_ATAG_SERIALNR     serialnr_tag;
 118     LINUX_ATAG_REVISION     revision_tag;
 119     LINUX_ATAG_VIDEOLFB     videolfb_tag;
 120     LINUX_ATAG_CMDLINE      cmdline_tag;
 121   } body;
 122 } LINUX_ATAG;
 123
 124 #endif /* __LINUX_ATAG_H__ */