arch/arm-sun4i/boot/atags.h

   1 /*
   2     Copyright © 2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8
   9 #ifndef ATAGS_H_
  10 #define ATAGS_H_
  11
  12 #include <inttypes.h>
  13
  14 typedef uint16_t uint16_t;
  15 typedef uint8_t uint8_t;
  16
  17 #define COMMAND_LINE_SIZE 1024
  18
  19 /* The list ends with an ATAG_NONE node. */
  20 #define ATAG_NONE       0x00000000
  21
  22 struct tag_header {
  23         uint32_t        size;
  24         uint32_t        tag;
  25 };
  26
  27 /* The list must start with an ATAG_CORE node */
  28 #define ATAG_CORE       0x54410001
  29
  30 struct tag_core {
  31         uint32_t        flags;            /* bit 0 = read-only */
  32         uint32_t        pagesize;
  33         uint32_t        rootdev;
  34 };
  35
  36 /* it is allowed to have multiple ATAG_MEM nodes */
  37 #define ATAG_MEM        0x54410002
  38
  39 struct tag_mem32 {
  40         uint32_t        size;
  41         uint32_t        start;  /* physical start address */
  42 };
  43
  44 /* VGA text type displays */
  45 #define ATAG_VIDEOTEXT  0x54410003
  46
  47 struct tag_videotext {
  48         uint8_t            x;
  49         uint8_t            y;
  50         uint16_t           video_page;
  51         uint8_t            video_mode;
  52         uint8_t            video_cols;
  53         uint16_t           video_ega_bx;
  54         uint8_t            video_lines;
  55         uint8_t            video_isvga;
  56         uint16_t           video_points;
  57 };
  58
  59 /* describes how the ramdisk will be used in kernel */
  60 #define ATAG_RAMDISK    0x54410004
  61
  62 struct tag_ramdisk {
  63         uint32_t flags;    /* bit 0 = load, bit 1 = prompt */
  64         uint32_t size;     /* decompressed ramdisk size in _kilo_ bytes */
  65         uint32_t start;    /* starting block of floppy-based RAM disk image */
  66 };
  67
  68 /* describes where the compressed ramdisk image lives (virtual address) */
  69 /*
  70  * this one accidentally used virtual addresses - as such,
  71  * it's deprecated.
  72  */
  73 #define ATAG_INITRD     0x54410005
  74
  75 /* describes where the compressed ramdisk image lives (physical address) */
  76 #define ATAG_INITRD2    0x54420005
  77
  78 struct tag_initrd {
  79         uint32_t start;    /* physical start address */
  80         uint32_t size;     /* size of compressed ramdisk image in bytes */
  81 };
  82
  83 /* board serial number. "64 bits should be enough for everybody" */
  84 #define ATAG_SERIAL     0x54410006
  85
  86 struct tag_serialnr {
  87         uint32_t low;
  88         uint32_t high;
  89 };
  90
  91 /* board revision */
  92 #define ATAG_REVISION   0x54410007
  93
  94 struct tag_revision {
  95         uint32_t rev;
  96 };
  97
  98 /* initial values for vesafb-type framebuffers. see struct screen_info
  99  * in include/linux/tty.h
 100  */
 101 #define ATAG_VIDEOLFB   0x54410008
 102
 103 struct tag_videolfb {
 104         uint16_t           lfb_width;
 105         uint16_t           lfb_height;
 106         uint16_t           lfb_depth;
 107         uint16_t           lfb_linelength;
 108         uint32_t           lfb_base;
 109         uint32_t           lfb_size;
 110         uint8_t            red_size;
 111         uint8_t            red_pos;
 112         uint8_t            green_size;
 113         uint8_t            green_pos;
 114         uint8_t            blue_size;
 115         uint8_t            blue_pos;
 116         uint8_t            rsvd_size;
 117         uint8_t            rsvd_pos;
 118 };
 119
 120 /* command line: \0 terminated string */
 121 #define ATAG_CMDLINE    0x54410009
 122
 123 struct tag_cmdline {
 124         char    cmdline[1];     /* this is the minimum size */
 125 };
 126
 127 /* acorn RiscPC specific information */
 128 #define ATAG_ACORN      0x41000101
 129
 130 struct tag_acorn {
 131         uint32_t memc_control_reg;
 132         uint32_t vram_pages;
 133         uint8_t sounddefault;
 134         uint8_t adfsdrives;
 135 };
 136
 137 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
 138 #define ATAG_MEMCLK     0x41000402
 139
 140 struct tag_memclk {
 141         uint32_t fmemclk;
 142 };
 143
 144 struct tag {
 145         struct tag_header hdr;
 146         union {
 147                 struct tag_core         core;
 148                 struct tag_mem32        mem;
 149                 struct tag_videotext    videotext;
 150                 struct tag_ramdisk      ramdisk;
 151                 struct tag_initrd       initrd;
 152                 struct tag_serialnr     serialnr;
 153                 struct tag_revision     revision;
 154                 struct tag_videolfb     videolfb;
 155                 struct tag_cmdline      cmdline;
 156
 157                 /*
 158                  * Acorn specific
 159                  */
 160                  struct tag_acorn        acorn;
 161
 162                 /*
 163                  * DC21285 specific
 164                  */
 165                  struct tag_memclk       memclk;
 166         } u;
 167 };
 168
 169 #define tag_member_present(tag,member)                          \
 170                 ((unsigned long)(&((struct tag *)0L)->member + 1)       \
 171                                 <= (tag)->hdr.size * 4)
 172
 173 #define tag_next(t)     ((struct tag *)((uint32_t *)(t) + (t)->hdr.size))
 174 #define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
 175
 176 #define for_each_tag(t,base)            \
 177                 for (t = base; t->hdr.size; t = tag_next(t))
 178
 179
 180 #endif /* ATAGS_H_ */