[Overview][Constants][Types][Procedures and functions][Variables][Index] Reference for unit 'go32' (#rtl)

segment_to_descriptor

Map segment address to descriptor

Declaration

Source position: go32.pp line 90

function segment_to_descriptor(

  seg: Word

):Word;

Description

Maps a real mode segment (paragraph) address onto an descriptor that can be used by a protected mode program to access the same memory.

Parameters:

seg
the real mode segment you want the descriptor to.

Return values: Descriptor to real mode segment address.

Remark: The returned descriptors limit will be set to 64 kB. Multiple calls to this function with the same segment address will return the same selector. Descriptors created by this function can never be modified or freed. Programs which need to examine various real mode addresses using the same selector should use the function allocate_ldt_descriptors and change the base address as necessary.

For an example, see seg_fillchar.

Errors

Check the int31error variable.

See also

allocate_ldt_descriptors

  

Allocate a number of descriptors

free_ldt_descriptor

  

Free a descriptor

set_segment_base_address

  

Set descriptor's base address


Documentation generated on: May 14 2021