tables.8

tiny bios--了解BIOS非常好的资料

	;
	; initialization tables
	;
	; (C)1997-2001 Pascal Dornier / PC Engines; All rights reserved.
	; This file is licensed pursuant to the COMMON PUBLIC LICENSE 0.5.
	;

	;
	; Initial initialization table (used in post2)
	;
clrtab:	db	cm_nmi+cm_b,cm_idx	;RTC: disable NMI
	db	2,cm_dat	;RTC: BCD mode, interrupt disable
	db	cm_nmi+cm_a,cm_idx	;RTC: 32768 Hz oscillator, 1ms int
	db	26h,cm_dat
	
	db	4,dma0+8	;disable dma0
	db	4,dma1+8+8	;disable dma1
	db	0,dma0+0dh	;reset dma0 (data don't care)
	db	0,dma1+0dh+0dh	;reset dma1 (data don't care)
	db	0fh,dma0+0fh	;mask all channels
	db	0fh,dma1+0fh+0fh	;mask all channels
	db	0,dma0+8	;Enable dma0
	db	0,dma1+8+8	;Enable dma1

	db	0fch,port61	;disable parity

#if def	NO_ISAREF
	db	50h,timer+3
#else
	db	54h,timer+3	;init refresh
#endif
	db	12h,timer+1	;refresh interval

	db	0ffh,0ffh	;end of table
	;
	; Timer, DMA, PIC initialization table (used in post2)
	;
	; first data byte, then port address
	;
tdmatab:	db	0,dma1+8+8	;Enable dma1
	db	0c0h,dma1+0bh+0bh	;Cascade mode, channel 4
	db	041h,dma1+0bh+0bh	;Single mode, channel 5
	db	042h,dma1+0bh+0bh	;Single mode, channel 6
	db	043h,dma1+0bh+0bh	;Single mode, channel 7
	db	0,dma1+09h+09h	;clear DRQ4 request
	db	0,dma1+0ah+0ah	;unmask DRQ4 -> enable cascade
	db	0,dma0+8	;Enable dma0
	db	40h,dma0+0bh	;Single mode, channel 0
	db	41h,dma0+0bh	;Single mode, channel 1
	db	42h,dma0+0bh	;Single mode, channel 2
	db	43h,dma0+0bh	;Single mode, channel 3
	
	db	0,npx+1	;clear x87 interrupt
	
	db	11h,pic0	;ICW1: edge, ICW4
	db	08h,pic0+1	;ICW2: interrupt vector 08..0F
	db	04h,pic0+1	;ICW3: IRQ2 is used for cascade
	db	01h,pic0+1	;ICW4: 8086 mode
	db	0ffh,pic0+1	;OCW: mask all interrupts
	
	db	11h,pic1	;ICW1: edge, ICW4
	db	70h,pic1+1	;ICW2: interrupt vector 70..77
	db	02h,pic1+1	;ICW3: slave identification number
	db	01h,pic1+1	;ICW4: 8086 mode
	db	0ffh,pic1+1	;OCW: mask all interrupts
	
	db	26h,port92	;enable A20 gate

	db	0ffh,0ffh	;end of table
	;
	; baud rates, H/L swapped
	;
rs_baud:	db	04,17h	;110 baud
	db	03,00h	;150 baud
	db	01,80h	;300 baud
	db	00,0c0h	;600 baud
	db	00,60h	;1200 baud
	db	00,30h	;2400 baud
	db	00,18h	;4800 baud
	db	00,0ch	;9600 baud
	;
	; serial port I/O addresses (points to scratch register)
	;
rs_ports:	dw	3ffh,2ffh,3efh,2efh,287h,28fh
	dw	297h,29fh,2F7h,377h,0	;0 = end of table
	;
	; parallel port I/O addresses
	;
lp_ports:	dw	03bch,0378h,0278h,0	;0 = end of table
	;
	; RTC initialization table
	;
	; Note: When location cm_dia is set to 80, MS-DOS will ignore the
	; RTC date and set 1980.
	;
rtc_tab:	db	0,cm_ss	;00: second
	db	0,cm_ssa	;01: alarm second
	db	0,cm_mm	;02: minute
	db	0,cm_mma	;03: alarm minute
	db	0,cm_hh	;04: hour
	db	0,cm_hha	;05: alarm hour
	db	0,cm_day	;06: day of week
	db	1,cm_dd	;07: day
	db	1,cm_mo	;08: month
	db	00h,cm_yy	;09: year
	db	80h,cm_dia	;0E: power loss flag
	db	20h,cm_cent	;32: century
rtc_tab9:			;end of table