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

Name	Description
allocate_ldt_descriptors	Allocate a number of descriptors
free_ldt_descriptor	Free a descriptor
set_segment_base_address	Set descriptor's base address