1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  * NVRAM definitions and access functions.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * as published by the Free Software Foundation; either version
8  * 2 of the License, or (at your option) any later version.
9  */
10 
11 #ifndef _UAPI_ASM_POWERPC_NVRAM_H
12 #define _UAPI_ASM_POWERPC_NVRAM_H
13 
14 /* Signatures for nvram partitions */
15 #define NVRAM_SIG_SP	0x02	/* support processor */
16 #define NVRAM_SIG_OF	0x50	/* open firmware config */
17 #define NVRAM_SIG_FW	0x51	/* general firmware */
18 #define NVRAM_SIG_HW	0x52	/* hardware (VPD) */
19 #define NVRAM_SIG_FLIP	0x5a	/* Apple flip/flop header */
20 #define NVRAM_SIG_APPL	0x5f	/* Apple "system" (???) */
21 #define NVRAM_SIG_SYS	0x70	/* system env vars */
22 #define NVRAM_SIG_CFG	0x71	/* config data */
23 #define NVRAM_SIG_ELOG	0x72	/* error log */
24 #define NVRAM_SIG_VEND	0x7e	/* vendor defined */
25 #define NVRAM_SIG_FREE	0x7f	/* Free space */
26 #define NVRAM_SIG_OS	0xa0	/* OS defined */
27 #define NVRAM_SIG_PANIC	0xa1	/* Apple OSX "panic" */
28 
29 
30 /* PowerMac specific nvram stuffs */
31 
32 enum {
33 	pmac_nvram_OF,		/* Open Firmware partition */
34 	pmac_nvram_XPRAM,	/* MacOS XPRAM partition */
35 	pmac_nvram_NR		/* MacOS Name Registry partition */
36 };
37 
38 
39 /* Some offsets in XPRAM */
40 #define PMAC_XPRAM_MACHINE_LOC	0xe4
41 #define PMAC_XPRAM_SOUND_VOLUME	0x08
42 
43 /* Machine location structure in PowerMac XPRAM */
44 struct pmac_machine_location {
45 	unsigned int	latitude;	/* 2+30 bit Fractional number */
46 	unsigned int	longitude;	/* 2+30 bit Fractional number */
47 	unsigned int	delta;		/* mix of GMT delta and DLS */
48 };
49 
50 /*
51  * /dev/nvram ioctls
52  *
53  * Note that PMAC_NVRAM_GET_OFFSET is still supported, but is
54  * definitely obsolete. Do not use it if you can avoid it
55  */
56 
57 #define OBSOLETE_PMAC_NVRAM_GET_OFFSET \
58 				_IOWR('p', 0x40, int)
59 
60 #define IOC_NVRAM_GET_OFFSET	_IOWR('p', 0x42, int)	/* Get NVRAM partition offset */
61 #define IOC_NVRAM_SYNC		_IO('p', 0x43)		/* Sync NVRAM image */
62 
63 #endif /* _UAPI_ASM_POWERPC_NVRAM_H */
64