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 |