Int 80

AMI BIOS v1.00.12.AX1T - internal - BIOS SUBSYSTEM SELECTION

AH = function
00h install and initialize BIOS subsystem
AL = ??? (00h,01h,03h)
CX:BX = subsystem ID (see #03971)
ESI = address from which to load, or 00000000h for default for
subsystem
EDI = physical address at which to install, or 0 for default

Note: If CX=0000h on entry, this call is applied to all subsystems whose ID has low word BX 01h get BIOS subsystem information CX:BX = subsystem ID (see #03971)

Return:
AL = ???
AH = ???
EDX = uncompressed size of subsystem in bytes
SI = offset within subsystem of initialization
routine, or FFFFh if none
EDI = physical address of default location or 0
02h get matching subsystem identifier
AL = index into subsystem list (return ALth occurrence
matching BX)
BX = low word of subsystem identifier
(0001h,0002h,0004h,0005h,000Bh,FFFFh)
Return:
CF clear if successful
CX = high word of ALth matching subsystem
CF set on error

Note: The system is halted if AL=00h on entry 03h set up "big real" mode (4G segment limits) 04h turn off "big real" mode (restore 64K segment limits) 05h remove BIOS subsystem CX:BX = subsystem ID to leave out

Note: The system is halted if an invalid (not installed) subsystem ID is specified 06h get installed subsystem info CX:BX = subsystem ID (see #03971)

Return:
CF clear
EDX = length of ???
EDI = linear address of start of ???

Note: The system is halted if an invalid (not installed) subsystem ID is specified

Return:
CF clear if successful CF set on non-fatal error

Note: This interrupt vector is cleared to 0000h:0000h near the end of the BIOS startup sequence



(Table 03971)
Values for AMI BIOS subsystem ID:
00010001h      ROM BIOS @F000-FFFF
00010002h      setup??? (loaded @6000-68FF)
00010005h      APM code
0001000Bh      language-specific error message set (English)
00020002h      PnP/PCI ACFG code (loaded @F000-F1FF)
0001FFFFh
0002FFFFh      recovery code
00030004h
0003FFFFh      BIOS decompression code
0004000Bh
00060004h
0100FFFFh      ACFG data
10000000h      ROM @C000 (64K)
10000001h      HMA (48K)
10000002h      RAM @7A00 (24K)
10000003h      RAM @8000-BFFF
10000004h
10000005h      real-mode address space (0-1M)
1000000Bh      installed language-specific message set???

Category: Vendor-specific BIOS Extensions - Int 80h - A

Interrups Categories Contents