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https://github.com/stevenhowes/wbios.git
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Steve Howes
106 lines
2.3 KiB
Plaintext
106 lines
2.3 KiB
Plaintext
;
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; BIOS configuration data
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;
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; (C)1997-2003 Pascal Dornier / PC Engines; All rights reserved.
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; This file is licensed pursuant to the COMMON PUBLIC LICENSE 0.5.
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;
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; This data is modified to store system configuration, such as
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; PCI data, hard disk parameters, etc.
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;
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; pd 050206 add Int15 E820 system memory map
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; pd 030304 add support for four drives, add IDE I/O port and
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; master / slave information
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; pd 991020 add hd_top
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;
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even
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db "_DAT" ;header for checksum utility
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dw d_sum-d_beg ;pointer to checksum
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d_beg: ;start of data
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;
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; system memory map for Int15 E820
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;
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e820map: dd 0,0 ;index 0: base memory
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d_basmem: dd 0,0 ;size of base memory
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dd 1 ;type 1 = memory
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dd 0000f0000,0 ;index 1: BIOS ROM
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dd 000010000,0
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dd 2 ;type 2 = reserved
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dd 0fff00000,0 ;index 2: high BIOS
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dd 000100000,0
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dd 2 ;type 2 = reserved
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dd 000100000,0 ;index 3: extended memory
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d_exmem: dd 0,0 ;size of extended memory
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dd 1 ;type 1 = memory
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e820mape:
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;
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; Hard disk parameters
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;
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hd_prm0: db dpt_port dup 0 ;drive 80
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dw hdc ;primary port
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db 0,0 ;dpt_dev master
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hd_prm1: db dpt_port dup 0 ;drive 81
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dw hdc ;primary port
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db 0,10h ;dpt_dev slave
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#if def HD_4DRV
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db dpt_port dup 0 ;drive 82
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dw hdc2 ;secondary port
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db 0,0 ;dpt_dev master
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db dpt_port dup 0 ;drive 83
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dw hdc2 ;secondary port
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db 0,10h ;dpt_dev slave
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hd_prm99: ;end of table
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hd_top: db 84h ;top HDD + 1
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hd_good: db 01h ;set if last drive detected
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#else
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hd_prm99:
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hd_top: db 82h ;top HDD + 1
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hd_good: db 01h ;set if last drive detected
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#endif
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;
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; PCI data
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;
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; this is a procedure to avoid problems in protected mode access...
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getlbus: db 0b0h ;MOV AL
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d_lastbus: db 0 ;last PCI bus
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ret
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#if def CDBOOT
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even
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d_cdlba: dw 0,0 ;base LBA for last session
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d_cdbase: dw 0 ;CD-ROM port base
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d_cddrv: db 0b0h ;slave drive
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d_cdsec: db 15 ;sectors per track
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d_cdflag: db 0 ;1 = enable CD emulation
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#endif
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;
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; Data checksum
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;
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d_sum: db 0 ;checksum, end of data block
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;(filled in by utility)
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;
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; calculate data checksum
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;
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d_dosum:
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#if ! def M6117
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wbinvd ;write back cache
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#endif
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mov al,0
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mov si,offset d_beg
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mov cx,d_sum-d_beg
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d_dosum1: add al,[cs:si] ;calculate checksum
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inc si
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loop d_dosum1
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neg al
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mov [cs:si],al
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#if ! def M6117
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wbinvd
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#endif
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ret
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