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diff --git a/include/asm-ppc/prep_nvram.h b/include/asm-ppc/prep_nvram.h
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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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