include/asm-ppc/bootx.h

   1 /*
   2  * This file describes the structure passed from the BootX application
   3  * (for MacOS) when it is used to boot Linux.
   4  *
   5  * Written by Benjamin Herrenschmidt.
   6  */
   7
   8
   9 #ifndef __ASM_BOOTX_H__
  10 #define __ASM_BOOTX_H__
  11
  12 #ifdef macintosh
  13 #include <Types.h>
  14 #endif
  15
  16 #ifdef macintosh
  17 /* All this requires PowerPC alignment */
  18 #pragma options align=power
  19 #endif
  20
  21 /* On boostrap entry:
  22  *
  23  * r3 = 0x426f6f58      ('BooX')
  24  * r4 = pointer to boot_infos
  25  * r5 = NULL
  26  */
  27
  28 #define BOOT_INFO_VERSION               2
  29 #define BOOT_INFO_COMPATIBLE_VERSION    1
  30
  31 /* Here are the boot informations that are passed to the bootstrap
  32  * Note that the kernel arguments and the device tree are appended
  33  * at the end of this structure. */
  34 typedef struct boot_infos
  35 {
  36         /* Version of this structure */
  37         unsigned long   version;
  38         /* backward compatible down to version: */
  39         unsigned long   compatible_version;
  40
  41         /* NEW (vers. 2) this holds the current _logical_ base addr of
  42            the frame buffer (for use by early boot message) */
  43         unsigned char*  logicalDisplayBase;
  44
  45         /* Set to 0 by current BootX */
  46         unsigned long   unused[2];
  47
  48         /* The device tree (internal addresses relative to the beginning of the tree,
  49          * device tree offset relative to the beginning of this structure). */
  50         unsigned long   deviceTreeOffset;       /* Device tree offset */
  51         unsigned long   deviceTreeSize;         /* Size of the device tree */
  52
  53         /* Some infos about the current MacOS display */
  54         unsigned long   dispDeviceRect[4];      /* left,top,right,bottom */
  55         unsigned long   dispDeviceDepth;        /* (8, 16 or 32) */
  56         unsigned char*  dispDeviceBase;         /* base address (physical) */
  57         unsigned long   dispDeviceRowBytes;     /* rowbytes (in bytes) */
  58         unsigned long   dispDeviceColorsOffset; /* Colormap (8 bits only) or 0 (*) */
  59         /* Optional offset in the registry to the current
  60          * MacOS display. (Can be 0 when not detected) */
  61         unsigned long   dispDeviceRegEntryOffset;
  62
  63         /* Optional pointer to boot ramdisk (offset from this structure) */
  64         unsigned long   ramDisk;
  65         unsigned long   ramDiskSize;            /* size of ramdisk image */
  66
  67         /* Kernel command line arguments (offset from this structure) */
  68         unsigned long   kernelParamsOffset;
  69
  70 } boot_infos_t;
  71
  72 /* (*) The format of the colormap is 256 * 3 * 2 bytes. Each color index is represented
  73  * by 3 short words containing a 16 bits (unsigned) color component.
  74  * Later versions may contain the gamma table for direct-color devices here.
  75  */
  76 #define BOOTX_COLORTABLE_SIZE   (256UL*3UL*2UL)
  77
  78 #ifdef macintosh
  79 #pragma options align=reset
  80 #endif
  81
  82 #endif
  83