include/asm-ppc/prep_nvram.h

   1 /*
   2  * PreP compliant NVRAM access
   3  */
   4
   5 /* Corey Minyard (minyard@acm.org) - Stolen from PReP book.   Per the
   6    license I must say:
   7      (C) Copyright (Corey Minyard), (1998).  All rights reserved
   8  */
   9
  10 /* Structure map for NVRAM on PowerPC Reference Platform */
  11 /* All fields are either character/byte strings which are valid either
  12   endian or they are big-endian numbers.
  13
  14   There are a number of Date and Time fields which are in RTC format,
  15   big-endian. These are stored in UT (GMT).
  16
  17   For enum's: if given in hex then they are bit significant, i.e. only
  18   one bit is on for each enum.
  19 */
  20 #ifdef __KERNEL__
  21 #ifndef _PPC_PREP_NVRAM_H
  22 #define _PPC_PREP_NVRAM_H
  23
  24 #define MAX_PREP_NVRAM 0x8000
  25 #define PREP_NVRAM_AS0  0x74
  26 #define PREP_NVRAM_AS1  0x75
  27 #define PREP_NVRAM_DATA 0x77
  28
  29 #define NVSIZE 4096     /* size of NVRAM */
  30 #define OSAREASIZE 512  /* size of OSArea space */
  31 #define CONFSIZE 1024   /* guess at size of Configuration space */
  32
  33 typedef struct _SECURITY {
  34   unsigned long BootErrCnt;         /* Count of boot password errors */
  35   unsigned long ConfigErrCnt;       /* Count of config password errors */
  36   unsigned long BootErrorDT[2];     /* Date&Time from RTC of last error in pw */
  37   unsigned long ConfigErrorDT[2];   /* Date&Time from RTC of last error in pw */
  38   unsigned long BootCorrectDT[2];   /* Date&Time from RTC of last correct pw */
  39   unsigned long ConfigCorrectDT[2]; /* Date&Time from RTC of last correct pw */
  40   unsigned long BootSetDT[2];       /* Date&Time from RTC of last set of pw */
  41   unsigned long ConfigSetDT[2];     /* Date&Time from RTC of last set of pw */
  42   unsigned char Serial[16];         /* Box serial number */
  43 } SECURITY;
  44
  45 typedef enum _OS_ID {
  46   Unknown = 0,
  47   Firmware = 1,
  48   AIX = 2,
  49   NT = 3,
  50   MKOS2 = 4,
  51   MKAIX = 5,
  52   Taligent = 6,
  53   Solaris = 7,
  54   MK = 12
  55 } OS_ID;
  56
  57 typedef struct _ERROR_LOG {
  58   unsigned char ErrorLogEntry[40]; /* To be architected */
  59 } ERROR_LOG;
  60
  61 typedef enum _BOOT_STATUS {
  62   BootStarted = 0x01,
  63   BootFinished = 0x02,
  64   RestartStarted = 0x04,
  65   RestartFinished = 0x08,
  66   PowerFailStarted = 0x10,
  67   PowerFailFinished = 0x20,
  68   ProcessorReady = 0x40,
  69   ProcessorRunning = 0x80,
  70   ProcessorStart = 0x0100
  71 } BOOT_STATUS;
  72
  73 typedef struct _RESTART_BLOCK {
  74   unsigned short Version;
  75   unsigned short Revision;
  76   unsigned long ResumeReserve1[2];
  77   volatile unsigned long BootStatus;
  78   unsigned long CheckSum; /* Checksum of RESTART_BLOCK */
  79   void * RestartAddress;
  80   void * SaveAreaAddr;
  81   unsigned long SaveAreaLength;
  82 } RESTART_BLOCK;
  83
  84 typedef enum _OSAREA_USAGE {
  85   Empty = 0,
  86   Used = 1
  87 } OSAREA_USAGE;
  88
  89 typedef enum _PM_MODE {
  90   Suspend = 0x80, /* Part of state is in memory */
  91   Normal = 0x00   /* No power management in effect */
  92 } PMMODE;
  93
  94 typedef struct _HEADER {
  95   unsigned short Size;       /* NVRAM size in K(1024) */
  96   unsigned char Version;     /* Structure map different */
  97   unsigned char Revision;    /* Structure map the same -may
  98                                 be new values in old fields
  99                                 in other words old code still works */
 100   unsigned short Crc1;       /* check sum from beginning of nvram to OSArea */
 101   unsigned short Crc2;       /* check sum of config */
 102   unsigned char LastOS;      /* OS_ID */
 103   unsigned char Endian;      /* B if big endian, L if little endian */
 104   unsigned char OSAreaUsage; /* OSAREA_USAGE */
 105   unsigned char PMMode;      /* Shutdown mode */
 106   RESTART_BLOCK RestartBlock;
 107   SECURITY Security;
 108   ERROR_LOG ErrorLog[2];
 109
 110   /* Global Environment information */
 111   void * GEAddress;
 112   unsigned long GELength;
 113
 114   /* Date&Time from RTC of last change to Global Environment */
 115   unsigned long GELastWriteDT[2];
 116
 117   /* Configuration information */
 118   void * ConfigAddress;
 119   unsigned long ConfigLength;
 120
 121   /* Date&Time from RTC of last change to Configuration */
 122   unsigned long ConfigLastWriteDT[2];
 123   unsigned long ConfigCount; /* Count of entries in Configuration */
 124
 125   /* OS dependent temp area */
 126   void * OSAreaAddress;
 127   unsigned long OSAreaLength;
 128
 129   /* Date&Time from RTC of last change to OSAreaArea */
 130   unsigned long OSAreaLastWriteDT[2];
 131 } HEADER;
 132
 133 /* Here is the whole map of the NVRAM */
 134 typedef struct _NVRAM_MAP {
 135   HEADER Header;
 136   unsigned char GEArea[NVSIZE-CONFSIZE-OSAREASIZE-sizeof(HEADER)];
 137   unsigned char OSArea[OSAREASIZE];
 138   unsigned char ConfigArea[CONFSIZE];
 139 } NVRAM_MAP;
 140
 141 /* Routines to manipulate the NVRAM */
 142 void init_prep_nvram(void);
 143 char *prep_nvram_get_var(const char *name);
 144 char *prep_nvram_first_var(void);
 145 char *prep_nvram_next_var(char *name);
 146
 147 /* Routines to read and write directly to the NVRAM */
 148 unsigned char prep_nvram_read_val(int addr);
 149 void prep_nvram_write_val(int           addr,
 150                           unsigned char val);
 151
 152 #endif /* _PPC_PREP_NVRAM_H */
 153 #endif /* __KERNEL__ */