src/include/gpxe/isa_ids.h

   1 #ifndef ISA_IDS_H
   2 #define ISA_IDS_H
   3
   4 /*
   5  * This file defines IDs as used by ISAPnP and EISA devices.  These
   6  * IDs have the format:
   7  *
   8  * vendor  byte 0 bit  7    must be zero
   9  *                bits 6-2  first vendor char in compressed ASCII
  10  *                bits 1-0  second vendor char in compressed ASCII (bits 4-3)
  11  *         byte 1 bits 7-5  second vendor char in compressed ASCII (bits 2-0)
  12  *                bits 4-0  third vendor char in compressed ASCII
  13  * product byte 0 bits 7-4  first hex digit of product number
  14  *                bits 3-0  second hex digit of product number
  15  *         byte 1 bits 7-4  third hex digit of product number
  16  *                bits 3-0  hex digit of revision level
  17  *
  18  * ISA IDs are always expressed in little-endian order, even though
  19  * the underlying "meaning" is big-endian.
  20  */
  21
  22 FILE_LICENCE ( GPL2_OR_LATER );
  23
  24 #include <byteswap.h>
  25
  26 /*
  27  * Construct a vendor ID from three ASCII characters
  28  *
  29  */
  30 #define ISA_VENDOR( a, b, c )                                   \
  31         bswap_16 ( ( ( ( (a) - 'A' + 1 ) & 0x1f ) << 10 ) |     \
  32                    ( ( ( (b) - 'A' + 1 ) & 0x1f ) << 5 ) |      \
  33                    ( ( ( (c) - 'A' + 1 ) & 0x1f ) << 0 ) )
  34
  35 #define ISAPNP_VENDOR( a, b, c )        ISA_VENDOR ( a, b, c )
  36 #define EISA_VENDOR( a, b, c )          ISA_VENDOR ( a, b, c )
  37
  38 #define GENERIC_ISAPNP_VENDOR           ISAPNP_VENDOR ( 'P','N','P' )
  39
  40 /*
  41  * Extract product ID and revision from combined product field
  42  *
  43  */
  44 #define ISA_PROD_ID_MASK        ( 0xf0ff )
  45 #define ISA_PROD_ID(product)    ( (product) & ISA_PROD_ID_MASK )
  46 #define ISA_PROD_REV(product)   ( ( (product) & ~ISA_PROD_ID_MASK ) >> 8 )
  47
  48 /* Functions in isa_ids.c */
  49 extern char * isa_id_string ( unsigned int vendor, unsigned int product );
  50
  51 #endif /* ISA_IDS_H */