include/linux/ipmi-fru.h

   1 /*
   2  * Copyright (C) 2012 CERN (www.cern.ch)
   3  * Author: Alessandro Rubini <rubini@gnudd.com>
   4  *
   5  * Released according to the GNU GPL, version 2 or any later version.
   6  *
   7  * This work is part of the White Rabbit project, a research effort led
   8  * by CERN, the European Institute for Nuclear Research.
   9  */
  10 #ifndef __LINUX_IPMI_FRU_H__
  11 #define __LINUX_IPMI_FRU_H__
  12 #ifdef __KERNEL__
  13 #  include <linux/types.h>
  14 #  include <linux/string.h>
  15 #else
  16 #  include <stdint.h>
  17 #  include <string.h>
  18 #endif
  19
  20 /*
  21  * These structures match the unaligned crap we have in FRU1011.pdf
  22  * (http://download.intel.com/design/servers/ipmi/FRU1011.pdf)
  23  */
  24
  25 /* chapter 8, page 5 */
  26 struct fru_common_header {
  27         uint8_t format;                 /* 0x01 */
  28         uint8_t internal_use_off;       /* multiple of 8 bytes */
  29         uint8_t chassis_info_off;       /* multiple of 8 bytes */
  30         uint8_t board_area_off;         /* multiple of 8 bytes */
  31         uint8_t product_area_off;       /* multiple of 8 bytes */
  32         uint8_t multirecord_off;        /* multiple of 8 bytes */
  33         uint8_t pad;                    /* must be 0 */
  34         uint8_t checksum;               /* sum modulo 256 must be 0 */
  35 };
  36
  37 /* chapter 9, page 5 -- internal_use: not used by us */
  38
  39 /* chapter 10, page 6 -- chassis info: not used by us */
  40
  41 /* chapter 13, page 9 -- used by board_info_area below */
  42 struct fru_type_length {
  43         uint8_t type_length;
  44         uint8_t data[0];
  45 };
  46
  47 /* chapter 11, page 7 */
  48 struct fru_board_info_area {
  49         uint8_t format;                 /* 0x01 */
  50         uint8_t area_len;               /* multiple of 8 bytes */
  51         uint8_t language;               /* I hope it's 0 */
  52         uint8_t mfg_date[3];            /* LSB, minutes since 1996-01-01 */
  53         struct fru_type_length tl[0];   /* type-length stuff follows */
  54
  55         /*
  56          * the TL there are in order:
  57          * Board Manufacturer
  58          * Board Product Name
  59          * Board Serial Number
  60          * Board Part Number
  61          * FRU File ID (may be null)
  62          * more manufacturer-specific stuff
  63          * 0xc1 as a terminator
  64          * 0x00 pad to a multiple of 8 bytes - 1
  65          * checksum (sum of all stuff module 256 must be zero)
  66          */
  67 };
  68
  69 enum fru_type {
  70         FRU_TYPE_BINARY         = 0x00,
  71         FRU_TYPE_BCDPLUS        = 0x40,
  72         FRU_TYPE_ASCII6         = 0x80,
  73         FRU_TYPE_ASCII          = 0xc0, /* not ascii: depends on language */
  74 };
  75
  76 /*
  77  * some helpers
  78  */
  79 static inline struct fru_board_info_area *fru_get_board_area(
  80         const struct fru_common_header *header)
  81 {
  82         /* we know for sure that the header is 8 bytes in size */
  83         return (struct fru_board_info_area *)(header + header->board_area_off);
  84 }
  85
  86 static inline int fru_type(struct fru_type_length *tl)
  87 {
  88         return tl->type_length & 0xc0;
  89 }
  90
  91 static inline int fru_length(struct fru_type_length *tl)
  92 {
  93         return (tl->type_length & 0x3f) + 1; /* len of whole record */
  94 }
  95
  96 /* assume ascii-latin1 encoding */
  97 static inline int fru_strlen(struct fru_type_length *tl)
  98 {
  99         return fru_length(tl) - 1;
 100 }
 101
 102 static inline char *fru_strcpy(char *dest, struct fru_type_length *tl)
 103 {
 104         int len = fru_strlen(tl);
 105         memcpy(dest, tl->data, len);
 106         dest[len] = '\0';
 107         return dest;
 108 }
 109
 110 static inline struct fru_type_length *fru_next_tl(struct fru_type_length *tl)
 111 {
 112         return tl + fru_length(tl);
 113 }
 114
 115 static inline int fru_is_eof(struct fru_type_length *tl)
 116 {
 117         return tl->type_length == 0xc1;
 118 }
 119
 120 /*
 121  * External functions defined in fru-parse.c.
 122  */
 123 extern int fru_header_cksum_ok(struct fru_common_header *header);
 124 extern int fru_bia_cksum_ok(struct fru_board_info_area *bia);
 125
 126 /* All these 4 return allocated strings by calling fru_alloc() */
 127 extern char *fru_get_board_manufacturer(struct fru_common_header *header);
 128 extern char *fru_get_product_name(struct fru_common_header *header);
 129 extern char *fru_get_serial_number(struct fru_common_header *header);
 130 extern char *fru_get_part_number(struct fru_common_header *header);
 131
 132 /* This must be defined by the caller of the above functions */
 133 extern void *fru_alloc(size_t size);
 134
 135 #endif /* __LINUX_IMPI_FRU_H__ */