xref: /openbmc/linux/arch/powerpc/include/uapi/asm/bootx.h (revision 6f52b16c)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * This file describes the structure passed from the BootX application
4  * (for MacOS) when it is used to boot Linux.
5  *
6  * Written by Benjamin Herrenschmidt.
7  */
8 
9 
10 #ifndef _UAPI__ASM_BOOTX_H__
11 #define _UAPI__ASM_BOOTX_H__
12 
13 #include <linux/types.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 
129 #ifdef macintosh
130 #pragma options align=reset
131 #endif
132 
133 #endif /* _UAPI__ASM_BOOTX_H__ */
134