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 #include "linux_type_defs.h"
  15 #endif
  16
  17 #ifdef macintosh
  18 /* All this requires PowerPC alignment */
  19 #pragma options align=power
  20 #endif
  21
  22 /* On kernel entry:
  23  *
  24  * r3 = 0x426f6f58    ('BooX')
  25  * r4 = pointer to boot_infos
  26  * r5 = NULL
  27  *
  28  * Data and instruction translation disabled, interrupts
  29  * disabled, kernel loaded at physical 0x00000000 on PCI
  30  * machines (will be different on NuBus).
  31  */
  32
  33 #define BOOT_INFO_VERSION               5
  34 #define BOOT_INFO_COMPATIBLE_VERSION    1
  35
  36 /* Bit in the architecture flag mask. More to be defined in
  37    future versions. Note that either BOOT_ARCH_PCI or
  38    BOOT_ARCH_NUBUS is set. The other BOOT_ARCH_NUBUS_xxx are
  39    set additionally when BOOT_ARCH_NUBUS is set.
  40  */
  41 #define BOOT_ARCH_PCI                   0x00000001UL
  42 #define BOOT_ARCH_NUBUS                 0x00000002UL
  43 #define BOOT_ARCH_NUBUS_PDM             0x00000010UL
  44 #define BOOT_ARCH_NUBUS_PERFORMA        0x00000020UL
  45 #define BOOT_ARCH_NUBUS_POWERBOOK       0x00000040UL
  46
  47 /*  Maximum number of ranges in phys memory map */
  48 #define MAX_MEM_MAP_SIZE                                26
  49
  50 /* This is the format of an element in the physical memory map. Note that
  51    the map is optional and current BootX will only build it for pre-PCI
  52    machines */
  53 typedef struct boot_info_map_entry
  54 {
  55     __u32       physAddr;                /* Physical starting address */
  56     __u32       size;                    /* Size in bytes */
  57 } boot_info_map_entry_t;
  58
  59
  60 /* Here are the boot informations that are passed to the bootstrap
  61  * Note that the kernel arguments and the device tree are appended
  62  * at the end of this structure. */
  63 typedef struct boot_infos
  64 {
  65     /* Version of this structure */
  66     __u32       version;
  67     /* backward compatible down to version: */
  68     __u32       compatible_version;
  69
  70     /* NEW (vers. 2) this holds the current _logical_ base addr of
  71        the frame buffer (for use by early boot message) */
  72     __u8*       logicalDisplayBase;
  73
  74     /* NEW (vers. 4) Apple's machine identification */
  75     __u32       machineID;
  76
  77     /* NEW (vers. 4) Detected hw architecture */
  78     __u32       architecture;
  79
  80     /* The device tree (internal addresses relative to the beginning of the tree,
  81      * device tree offset relative to the beginning of this structure).
  82      * On pre-PCI macintosh (BOOT_ARCH_PCI bit set to 0 in architecture), this
  83      * field is 0.
  84      */
  85     __u32       deviceTreeOffset;        /* Device tree offset */
  86     __u32       deviceTreeSize;          /* Size of the device tree */
  87
  88     /* Some infos about the current MacOS display */
  89     __u32       dispDeviceRect[4];       /* left,top,right,bottom */
  90     __u32       dispDeviceDepth;         /* (8, 16 or 32) */
  91     __u8*       dispDeviceBase;          /* base address (physical) */
  92     __u32       dispDeviceRowBytes;      /* rowbytes (in bytes) */
  93     __u32       dispDeviceColorsOffset;  /* Colormap (8 bits only) or 0 (*) */
  94     /* Optional offset in the registry to the current
  95      * MacOS display. (Can be 0 when not detected) */
  96      __u32      dispDeviceRegEntryOffset;
  97
  98     /* Optional pointer to boot ramdisk (offset from this structure) */
  99     __u32       ramDisk;
 100     __u32       ramDiskSize;             /* size of ramdisk image */
 101
 102     /* Kernel command line arguments (offset from this structure) */
 103     __u32       kernelParamsOffset;
 104
 105     /* ALL BELOW NEW (vers. 4) */
 106
 107     /* This defines the physical memory. Valid with BOOT_ARCH_NUBUS flag
 108        (non-PCI) only. On PCI, memory is contiguous and it's size is in the
 109        device-tree. */
 110     boot_info_map_entry_t
 111                 physMemoryMap[MAX_MEM_MAP_SIZE]; /* Where the phys memory is */
 112     __u32       physMemoryMapSize;               /* How many entries in map */
 113
 114
 115     /* The framebuffer size (optional, currently 0) */
 116     __u32       frameBufferSize;         /* Represents a max size, can be 0. */
 117
 118     /* NEW (vers. 5) */
 119
 120     /* Total params size (args + colormap + device tree + ramdisk) */
 121     __u32       totalParamsSize;
 122
 123 } boot_infos_t;
 124
 125 /* (*) The format of the colormap is 256 * 3 * 2 bytes. Each color index is represented
 126  * by 3 short words containing a 16 bits (unsigned) color component.
 127  * Later versions may contain the gamma table for direct-color devices here.
 128  */
 129 #define BOOTX_COLORTABLE_SIZE    (256UL*3UL*2UL)
 130
 131 #ifdef macintosh
 132 #pragma options align=reset
 133 #endif
 134
 135 #endif