nvram.h

/*
 * PreP compliant NVRAM access
 *
 * This file can be found in motorla or IBP PPC site.
 */

#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 OSArea */
  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 */