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/*
 * PreP compliant NVRAM access
 *
 * This file can be found in motorla or IBP PPC site.
 *
 * $Id: nvram.h,v 1.2 2001-09-27 12:01:06 chris Exp $
 */
 
#ifndef _PPC_NVRAM_H
#define _PPC_NVRAM_H
 
#define NVRAM_AS0  0x74
#define NVRAM_AS1  0x75
#define NVRAM_DATA 0x77
 
 
/* RTC Offsets */
 
#define MOTO_RTC_SECONDS	0x1FF9
#define MOTO_RTC_MINUTES	0x1FFA
#define MOTO_RTC_HOURS		0x1FFB
#define MOTO_RTC_DAY_OF_WEEK	0x1FFC
#define MOTO_RTC_DAY_OF_MONTH	0x1FFD
#define MOTO_RTC_MONTH		0x1FFE
#define MOTO_RTC_YEAR		0x1FFF
#define MOTO_RTC_CONTROLA       0x1FF8
#define MOTO_RTC_CONTROLB       0x1FF9
 
#ifndef BCD_TO_BIN
#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
#endif
 
#ifndef BIN_TO_BCD
#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
#endif
 
/* 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.
*/
 
#define NVSIZE 		4096	/* size of NVRAM */
#define OSAREASIZE 	512	/* size of OSArea space */
#define CONFSIZE 	1024	/* guess at size of Configuration space */
 
#ifndef ASM
 
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);
 
#endif /* ASM */
 
#endif /* _PPC_NVRAM_H */