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/*
* PreP compliant NVRAM access
*/
/* Corey Minyard (minyard@acm.org) - Stolen from PReP book. Per the
license I must say:
(C) Copyright (Corey Minyard), (1998). All rights reserved
*/
/* Structure map for NVRAM on PowerPC Reference Platform */
/* All fields are either character/byte strings which are valid either
endian or they are big-endian numbers.
There are a number of Date and Time fields which are in RTC format,
big-endian. These are stored in UT (GMT).
For enum's: if given in hex then they are bit significant, i.e. only
one bit is on for each enum.
*/
#ifdef __KERNEL__
#ifndef _PPC_PREP_NVRAM_H
#define _PPC_PREP_NVRAM_H
#define MAX_PREP_NVRAM 0x8000
#define PREP_NVRAM_AS0 0x74
#define PREP_NVRAM_AS1 0x75
#define PREP_NVRAM_DATA 0x77
#define NVSIZE 4096 /* size of NVRAM */
#define OSAREASIZE 512 /* size of OSArea space */
#define CONFSIZE 1024 /* guess at size of Configuration space */
typedef struct _SECURITY {
unsigned long BootErrCnt; /* Count of boot password errors */
unsigned long ConfigErrCnt; /* Count of config password errors */
unsigned long BootErrorDT[2]; /* Date&Time from RTC of last error in pw */
unsigned long ConfigErrorDT[2]; /* Date&Time from RTC of last error in pw */
unsigned long BootCorrectDT[2]; /* Date&Time from RTC of last correct pw */
unsigned long ConfigCorrectDT[2]; /* Date&Time from RTC of last correct pw */
unsigned long BootSetDT[2]; /* Date&Time from RTC of last set of pw */
unsigned long ConfigSetDT[2]; /* Date&Time from RTC of last set of pw */
unsigned char Serial[16]; /* Box serial number */
} SECURITY;
typedef enum _OS_ID {
Unknown = 0,
Firmware = 1,
AIX = 2,
NT = 3,
MKOS2 = 4,
MKAIX = 5,
Taligent = 6,
Solaris = 7,
MK = 12
} OS_ID;
typedef struct _ERROR_LOG {
unsigned char ErrorLogEntry[40]; /* To be architected */
} ERROR_LOG;
typedef enum _BOOT_STATUS {
BootStarted = 0x01,
BootFinished = 0x02,
RestartStarted = 0x04,
RestartFinished = 0x08,
PowerFailStarted = 0x10,
PowerFailFinished = 0x20,
ProcessorReady = 0x40,
ProcessorRunning = 0x80,
ProcessorStart = 0x0100
} BOOT_STATUS;
typedef struct _RESTART_BLOCK {
unsigned short Version;
unsigned short Revision;
unsigned long ResumeReserve1[2];
volatile unsigned long BootStatus;
unsigned long CheckSum; /* Checksum of RESTART_BLOCK */
void * RestartAddress;
void * SaveAreaAddr;
unsigned long SaveAreaLength;
} RESTART_BLOCK;
typedef enum _OSAREA_USAGE {
Empty = 0,
Used = 1
} OSAREA_USAGE;
typedef enum _PM_MODE {
Suspend = 0x80, /* Part of state is in memory */
Normal = 0x00 /* No power management in effect */
} PMMODE;
typedef struct _HEADER {
unsigned short Size; /* NVRAM size in K(1024) */
unsigned char Version; /* Structure map different */
unsigned char Revision; /* Structure map the same -may
be new values in old fields
in other words old code still works */
unsigned short Crc1; /* check sum from beginning of nvram to OSArea */
unsigned short Crc2; /* check sum of config */
unsigned char LastOS; /* OS_ID */
unsigned char Endian; /* B if big endian, L if little endian */
unsigned char OSAreaUsage; /* OSAREA_USAGE */
unsigned char PMMode; /* Shutdown mode */
RESTART_BLOCK RestartBlock;
SECURITY Security;
ERROR_LOG ErrorLog[2];
/* Global Environment information */
void * GEAddress;
unsigned long GELength;
/* Date&Time from RTC of last change to Global Environment */
unsigned long GELastWriteDT[2];
/* Configuration information */
void * ConfigAddress;
unsigned long ConfigLength;
/* Date&Time from RTC of last change to Configuration */
unsigned long ConfigLastWriteDT[2];
unsigned long ConfigCount; /* Count of entries in Configuration */
/* OS dependent temp area */
void * OSAreaAddress;
unsigned long OSAreaLength;
/* Date&Time from RTC of last change to OSAreaArea */
unsigned long OSAreaLastWriteDT[2];
} HEADER;
/* Here is the whole map of the NVRAM */
typedef struct _NVRAM_MAP {
HEADER Header;
unsigned char GEArea[NVSIZE-CONFSIZE-OSAREASIZE-sizeof(HEADER)];
unsigned char OSArea[OSAREASIZE];
unsigned char ConfigArea[CONFSIZE];
} NVRAM_MAP;
/* Routines to manipulate the NVRAM */
void init_prep_nvram(void);
char *prep_nvram_get_var(const char *name);
char *prep_nvram_first_var(void);
char *prep_nvram_next_var(char *name);
/* Routines to read and write directly to the NVRAM */
unsigned char prep_nvram_read_val(int addr);
void prep_nvram_write_val(int addr,
unsigned char val);
#endif /* _PPC_PREP_NVRAM_H */
#endif /* __KERNEL__ */
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