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e_port(9s)


NAME

  e_port - Contains I/O port information


SYNOPSIS

  ___________________________
  Member Name	  Data Type
  ___________________________
  base_address	  vm_offset_t
  numb_of_ports	  uint_t
  is_shared	  uint_t
  ___________________________


MEMBERS

  base_address
      Specifies the base address of the I/O ports.

  numb_of_ports
      Specifies the number of ports in the range identified by the I/O
      handle. This member is not used on the ISA bus. The value of this
      member for the ISA bus is always zero (0).

  is_shared
      Specifies whether the option card can share this option card's I/O
      port. The EISA/ISA bus configuration code sets this member to one of
      the following values during hardware autoconfiguration:


      __________________________________________________
      Value   Meaning
      __________________________________________________
      0	      The option card cannot share the I/O port.
      1	      The option card can share the I/O port.
      __________________________________________________




DESCRIPTION

  The e_port structure describes bus I/O port information. The bus
  configuration code initializes the members of the e_port structure during
  hardware autoconfiguration. Device drivers call the get_config interface to
  obtain information stored in the members of the e_port data structure.










FILES

  <io/dec/eisa/eisa.h>




SEE ALSO

  Kernel Interfaces: get_config(9r)

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