arch/powerpc/include/asm/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 #include <linux/types.h>
  13
  14 #ifdef macintosh
  15 #include <Types.h>
  16 #include "linux_type_defs.h"
  17 #endif
  18
  19 #ifdef macintosh
  20 /* All this requires PowerPC alignment */
  21 #pragma options align=power
  22 #endif
  23
  24 /* On kernel entry:
  25  *
  26  * r3 = 0x426f6f58    ('BooX')
  27  * r4 = pointer to boot_infos
  28  * r5 = NULL
  29  *
  30  * Data and instruction translation disabled, interrupts
  31  * disabled, kernel loaded at physical 0x00000000 on PCI
  32  * machines (will be different on NuBus).
  33  */
  34
  35 #define BOOT_INFO_VERSION               5
  36 #define BOOT_INFO_COMPATIBLE_VERSION    1
  37
  38 /* Bit in the architecture flag mask. More to be defined in
  39    future versions. Note that either BOOT_ARCH_PCI or
  40    BOOT_ARCH_NUBUS is set. The other BOOT_ARCH_NUBUS_xxx are
  41    set additionally when BOOT_ARCH_NUBUS is set.
  42  */
  43 #define BOOT_ARCH_PCI                   0x00000001UL
  44 #define BOOT_ARCH_NUBUS                 0x00000002UL
  45 #define BOOT_ARCH_NUBUS_PDM             0x00000010UL
  46 #define BOOT_ARCH_NUBUS_PERFORMA        0x00000020UL
  47 #define BOOT_ARCH_NUBUS_POWERBOOK       0x00000040UL
  48
  49 /*  Maximum number of ranges in phys memory map */
  50 #define MAX_MEM_MAP_SIZE                                26
  51
  52 /* This is the format of an element in the physical memory map. Note that
  53    the map is optional and current BootX will only build it for pre-PCI
  54    machines */
  55 typedef struct boot_info_map_entry
  56 {
  57     __u32       physAddr;                /* Physical starting address */
  58     __u32       size;                    /* Size in bytes */
  59 } boot_info_map_entry_t;
  60
  61
  62 /* Here are the boot informations that are passed to the bootstrap
  63  * Note that the kernel arguments and the device tree are appended
  64  * at the end of this structure. */
  65 typedef struct boot_infos
  66 {
  67     /* Version of this structure */
  68     __u32       version;
  69     /* backward compatible down to version: */
  70     __u32       compatible_version;
  71
  72     /* NEW (vers. 2) this holds the current _logical_ base addr of
  73        the frame buffer (for use by early boot message) */
  74     __u8*       logicalDisplayBase;
  75
  76     /* NEW (vers. 4) Apple's machine identification */
  77     __u32       machineID;
  78
  79     /* NEW (vers. 4) Detected hw architecture */
  80     __u32       architecture;
  81
  82     /* The device tree (internal addresses relative to the beginning of the tree,
  83      * device tree offset relative to the beginning of this structure).
  84      * On pre-PCI macintosh (BOOT_ARCH_PCI bit set to 0 in architecture), this
  85      * field is 0.
  86      */
  87     __u32       deviceTreeOffset;        /* Device tree offset */
  88     __u32       deviceTreeSize;          /* Size of the device tree */
  89
  90     /* Some infos about the current MacOS display */
  91     __u32       dispDeviceRect[4];       /* left,top,right,bottom */
  92     __u32       dispDeviceDepth;         /* (8, 16 or 32) */
  93     __u8*       dispDeviceBase;          /* base address (physical) */
  94     __u32       dispDeviceRowBytes;      /* rowbytes (in bytes) */
  95     __u32       dispDeviceColorsOffset;  /* Colormap (8 bits only) or 0 (*) */
  96     /* Optional offset in the registry to the current
  97      * MacOS display. (Can be 0 when not detected) */
  98      __u32      dispDeviceRegEntryOffset;
  99
 100     /* Optional pointer to boot ramdisk (offset from this structure) */
 101     __u32       ramDisk;
 102     __u32       ramDiskSize;             /* size of ramdisk image */
 103
 104     /* Kernel command line arguments (offset from this structure) */
 105     __u32       kernelParamsOffset;
 106
 107     /* ALL BELOW NEW (vers. 4) */
 108
 109     /* This defines the physical memory. Valid with BOOT_ARCH_NUBUS flag
 110        (non-PCI) only. On PCI, memory is contiguous and it's size is in the
 111        device-tree. */
 112     boot_info_map_entry_t
 113                 physMemoryMap[MAX_MEM_MAP_SIZE]; /* Where the phys memory is */
 114     __u32       physMemoryMapSize;               /* How many entries in map */
 115
 116
 117     /* The framebuffer size (optional, currently 0) */
 118     __u32       frameBufferSize;         /* Represents a max size, can be 0. */
 119
 120     /* NEW (vers. 5) */
 121
 122     /* Total params size (args + colormap + device tree + ramdisk) */
 123     __u32       totalParamsSize;
 124
 125 } boot_infos_t;
 126
 127 #ifdef __KERNEL__
 128 /* (*) The format of the colormap is 256 * 3 * 2 bytes. Each color index
 129  * is represented by 3 short words containing a 16 bits (unsigned) color
 130  * component. Later versions may contain the gamma table for direct-color
 131  * devices here.
 132  */
 133 #define BOOTX_COLORTABLE_SIZE    (256UL*3UL*2UL)
 134
 135 /* BootX passes the device-tree using a format that comes from earlier
 136  * ppc32 kernels. This used to match what is in prom.h, but not anymore
 137  * so we now define it here
 138  */
 139 struct bootx_dt_prop {
 140         u32     name;
 141         int     length;
 142         u32     value;
 143         u32     next;
 144 };
 145
 146 struct bootx_dt_node {
 147         u32     unused0;
 148         u32     unused1;
 149         u32     phandle;        /* not really available */
 150         u32     unused2;
 151         u32     unused3;
 152         u32     unused4;
 153         u32     unused5;
 154         u32     full_name;
 155         u32     properties;
 156         u32     parent;
 157         u32     child;
 158         u32     sibling;
 159         u32     next;
 160         u32     allnext;
 161 };
 162
 163 extern void bootx_init(unsigned long r4, unsigned long phys);
 164
 165 #endif /* __KERNEL__ */
 166
 167 #ifdef macintosh
 168 #pragma options align=reset
 169 #endif
 170
 171 #endif