/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * NVRAM definitions and access functions.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _UAPI_ASM_POWERPC_NVRAM_H
#define _UAPI_ASM_POWERPC_NVRAM_H

/* Signatures for nvram partitions */
#define NVRAM_SIG_SP    0x02    /* support processor */
#define NVRAM_SIG_OF    0x50    /* open firmware config */
#define NVRAM_SIG_FW    0x51    /* general firmware */
#define NVRAM_SIG_HW    0x52    /* hardware (VPD) */
#define NVRAM_SIG_FLIP    0x5a    /* Apple flip/flop header */
#define NVRAM_SIG_APPL    0x5f    /* Apple "system" (???) */
#define NVRAM_SIG_SYS    0x70    /* system env vars */
#define NVRAM_SIG_CFG    0x71    /* config data */
#define NVRAM_SIG_ELOG    0x72    /* error log */
#define NVRAM_SIG_VEND    0x7e    /* vendor defined */
#define NVRAM_SIG_FREE    0x7f    /* Free space */
#define NVRAM_SIG_OS    0xa0    /* OS defined */
#define NVRAM_SIG_PANIC    0xa1    /* Apple OSX "panic" */


/* PowerMac specific nvram stuffs */

enum {
    pmac_nvram_OF,        /* Open Firmware partition */
    pmac_nvram_XPRAM,    /* MacOS XPRAM partition */
    pmac_nvram_NR        /* MacOS Name Registry partition */
};


/* Some offsets in XPRAM */
#define PMAC_XPRAM_MACHINE_LOC    0xe4
#define PMAC_XPRAM_SOUND_VOLUME    0x08

/* Machine location structure in PowerMac XPRAM */
struct pmac_machine_location {
    unsigned int    latitude;    /* 2+30 bit Fractional number */
    unsigned int    longitude;    /* 2+30 bit Fractional number */
    unsigned int    delta;        /* mix of GMT delta and DLS */
};

/*
 * /dev/nvram ioctls
 *
 * Note that PMAC_NVRAM_GET_OFFSET is still supported, but is
 * definitely obsolete. Do not use it if you can avoid it
 */

#define OBSOLETE_PMAC_NVRAM_GET_OFFSET \
                _IOWR('p', 0x40, int)

#define IOC_NVRAM_GET_OFFSET    _IOWR('p', 0x42, int)    /* Get NVRAM partition offset */
#define IOC_NVRAM_SYNC        _IO('p', 0x43)        /* Sync NVRAM image */

#endif /* _UAPI_ASM_POWERPC_NVRAM_H */