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