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bootx.h
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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 _UAPI__ASM_BOOTX_H__
10 #define _UAPI__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 */
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 */
69  /* backward compatible down to version: */
71 
72  /* NEW (vers. 2) this holds the current _logical_ base addr of
73  the frame buffer (for use by early boot message) */
75 
76  /* NEW (vers. 4) Apple's machine identification */
78 
79  /* NEW (vers. 4) Detected hw 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) */
99 
100  /* Optional pointer to boot ramdisk (offset from this structure) */
102  __u32 ramDiskSize; /* size of ramdisk image */
103 
104  /* Kernel command line arguments (offset from this structure) */
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. */
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) */
124 
125 } boot_infos_t;
126 
127 
128 #ifdef macintosh
129 #pragma options align=reset
130 #endif
131 
132 #endif /* _UAPI__ASM_BOOTX_H__ */