File: /usr/src/linux/include/asm-ppc/bootx.h
1 /*
2 * BK Id: SCCS/s.bootx.h 1.5 05/17/01 18:14:24 cort
3 */
4 /*
5 * This file describes the structure passed from the BootX application
6 * (for MacOS) when it is used to boot Linux.
7 *
8 * Written by Benjamin Herrenschmidt.
9 */
10
11
12 #ifndef __ASM_BOOTX_H__
13 #define __ASM_BOOTX_H__
14
15 #ifdef macintosh
16 #include <Types.h>
17 #include "linux_type_defs.h"
18 #endif
19
20 #ifdef macintosh
21 /* All this requires PowerPC alignment */
22 #pragma options align=power
23 #endif
24
25 /* On kernel entry:
26 *
27 * r3 = 0x426f6f58 ('BooX')
28 * r4 = pointer to boot_infos
29 * r5 = NULL
30 *
31 * Data and instruction translation disabled, interrupts
32 * disabled, kernel loaded at physical 0x00000000 on PCI
33 * machines (will be different on NuBus).
34 */
35
36 #define BOOT_INFO_VERSION 5
37 #define BOOT_INFO_COMPATIBLE_VERSION 1
38
39 /* Bit in the architecture flag mask. More to be defined in
40 future versions. Note that either BOOT_ARCH_PCI or
41 BOOT_ARCH_NUBUS is set. The other BOOT_ARCH_NUBUS_xxx are
42 set additionally when BOOT_ARCH_NUBUS is set.
43 */
44 #define BOOT_ARCH_PCI 0x00000001UL
45 #define BOOT_ARCH_NUBUS 0x00000002UL
46 #define BOOT_ARCH_NUBUS_PDM 0x00000010UL
47 #define BOOT_ARCH_NUBUS_PERFORMA 0x00000020UL
48 #define BOOT_ARCH_NUBUS_POWERBOOK 0x00000040UL
49
50 /* Maximum number of ranges in phys memory map */
51 #define MAX_MEM_MAP_SIZE 26
52
53 /* This is the format of an element in the physical memory map. Note that
54 the map is optional and current BootX will only build it for pre-PCI
55 machines */
56 typedef struct boot_info_map_entry
57 {
58 __u32 physAddr; /* Physical starting address */
59 __u32 size; /* Size in bytes */
60 } boot_info_map_entry_t;
61
62
63 /* Here are the boot informations that are passed to the bootstrap
64 * Note that the kernel arguments and the device tree are appended
65 * at the end of this structure. */
66 typedef struct boot_infos
67 {
68 /* Version of this structure */
69 __u32 version;
70 /* backward compatible down to version: */
71 __u32 compatible_version;
72
73 /* NEW (vers. 2) this holds the current _logical_ base addr of
74 the frame buffer (for use by early boot message) */
75 __u8* logicalDisplayBase;
76
77 /* NEW (vers. 4) Apple's machine identification */
78 __u32 machineID;
79
80 /* NEW (vers. 4) Detected hw architecture */
81 __u32 architecture;
82
83 /* The device tree (internal addresses relative to the beginning of the tree,
84 * device tree offset relative to the beginning of this structure).
85 * On pre-PCI macintosh (BOOT_ARCH_PCI bit set to 0 in architecture), this
86 * field is 0.
87 */
88 __u32 deviceTreeOffset; /* Device tree offset */
89 __u32 deviceTreeSize; /* Size of the device tree */
90
91 /* Some infos about the current MacOS display */
92 __u32 dispDeviceRect[4]; /* left,top,right,bottom */
93 __u32 dispDeviceDepth; /* (8, 16 or 32) */
94 __u8* dispDeviceBase; /* base address (physical) */
95 __u32 dispDeviceRowBytes; /* rowbytes (in bytes) */
96 __u32 dispDeviceColorsOffset; /* Colormap (8 bits only) or 0 (*) */
97 /* Optional offset in the registry to the current
98 * MacOS display. (Can be 0 when not detected) */
99 __u32 dispDeviceRegEntryOffset;
100
101 /* Optional pointer to boot ramdisk (offset from this structure) */
102 __u32 ramDisk;
103 __u32 ramDiskSize; /* size of ramdisk image */
104
105 /* Kernel command line arguments (offset from this structure) */
106 __u32 kernelParamsOffset;
107
108 /* ALL BELOW NEW (vers. 4) */
109
110 /* This defines the physical memory. Valid with BOOT_ARCH_NUBUS flag
111 (non-PCI) only. On PCI, memory is contiguous and it's size is in the
112 device-tree. */
113 boot_info_map_entry_t
114 physMemoryMap[MAX_MEM_MAP_SIZE]; /* Where the phys memory is */
115 __u32 physMemoryMapSize; /* How many entries in map */
116
117
118 /* The framebuffer size (optional, currently 0) */
119 __u32 frameBufferSize; /* Represents a max size, can be 0. */
120
121 /* NEW (vers. 5) */
122
123 /* Total params size (args + colormap + device tree + ramdisk) */
124 __u32 totalParamsSize;
125
126 } boot_infos_t;
127
128 /* (*) The format of the colormap is 256 * 3 * 2 bytes. Each color index is represented
129 * by 3 short words containing a 16 bits (unsigned) color component.
130 * Later versions may contain the gamma table for direct-color devices here.
131 */
132 #define BOOTX_COLORTABLE_SIZE (256UL*3UL*2UL)
133
134 #ifdef macintosh
135 #pragma options align=reset
136 #endif
137
138 #endif
139