BIOS32
BIOS32
Introduction
BIOS32 is a method for calling BIOS services directly from 32 bit Protected Mode. It is mainly used for PNP and PCI services.
Interface
Locating
The BIOS32 Service Directory Header is located on a paragraph (16 Byte) boundary in the physical memory region 0xE0000-0xFFFFF. It starts with a 4 byte signature of "_32_" (0x5F32335F)
Structure
This page is a work in progress.
This page may thus be incomplete. Its content may be changed in the near future.
| Offset | Size | Name | Description |
| 0 | 4 bytes | Signature | ASCII signature "_32_" (0x5F32335F) |
| 4 | 4 bytes | Entry Point | 32 bit physical address (not CS:IP) of BIOS32 calling interface entry point. |
| 8 | 1 byte | Revision | Revision of BIOS32. Current 0h |
| 9 | 1 byte | Length | Length of structure, in paragraphs |
| 10 | 1 byte | Checksum | A summation checksum (1 byte granularity) |
| 11 | 5 bytes | Reserved | Reserved for future use, should be 0. |