A2osX/ProDOS.203/ProDOS.S.GP.txt

NEW
  AUTO 3,1
* object code = mli_1
* global page

ofsG			.EQ	$2E00-MLI		offset to global org
			.BS $2E00-*
H2E00			jmp	mlient1			$2E00-2EFF moved to $BF00
jspare			.EQ	*-ofsG
				jmp  jspare			will be changed to point to dispatcher.
clockv 		.EQ	*-ofsG			P8 clock vector
				rts					changed to jmp ($4C) if clock present.
	  .DA tclk_in			clock routine entry address.
p8errv 		.EQ	*-ofsG			error reporting hook.
				jmp syserr1
sysdeath		.EQ	*-ofsG
				jmp sysdeath1		system failure hook.
p8error  		.EQ  *-ofsG			P8 error code
				.DA #0
drivertbl1 		.EQ *-ofsG			device driver table 1
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
drivertbl2 		.EQ	*-ofsG			device driver table 2
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
				.DA nodevice
*devnum			.EQ	*-ofsG			most recent accessed device
				.DA #0
numdevs  		.EQ	*-ofsG			count (-1) active devices
				.DA #$ff
devlist  		.EQ	*-ofsG			active device list
				.HS 00000000000000	up to 14 units may be active
				.HS 00000000000000
				.DA #0

				.AS "(C)APPLE  "
mlient1			.EQ	*-ofsG
				php
				sei
				jmp mlicont
aftirq			.EQ	*-ofsG			irq returns here.
				sta RRAMWRAMBNK1			read/write RAM bank 1
				jmp fix45			restore $45 after interrupt in LC
oldacc			.EQ	*-ofsG
				.DA #0
afbank			.EQ	*-ofsG
				.HS 00

* memory map of lower 48k. each bit represents 1 page.
* protected pages = 1, unprotected = 0

memmap 			.EQ	*-ofsG			P8 memory bitmap
				.HS C000000000000000
				.HS 0000000000000000
				.HS 0000000000000001

* table of buffer addresses for currently open files.
* these can only be changed thru the mli call setbuf.

buftbl 			.EQ	*-ofsG
				.HS 0000		file #1
				.HS 0000	  file #2
				.HS 0000	  file #3
				.HS 0000	  file #4
				.HS 0000	file #5
				.HS 0000	file #6
				.HS 0000	file #7
				.HS 0000	file #8

* table of interrupt vectors. these can only be changed
* by the mli call allocate_interrupt. values of the registers
* at the time of the most recent interrupt are stored here along
* with the address interrupted.

inttbl 			.EQ	*-ofsG			interrupt table
				.HS 0000		int #1
				.HS 0000	int #2
				.HS 0000	int #3
				.HS 0000	int #4
p8areg 			.EQ	*-ofsG			A register savearea
				.DA #0
p8xreg 			.EQ	*-ofsG			X register savearea
				.DA #0
p8yreg 			.EQ	*-ofsG			Y register savearea
				.DA #0
p8sreg 			.EQ	*-ofsG			S register savearea
				.DA #0
p8preg 			.EQ	*-ofsG			P register savearea
				.DA #0
bankid			.EQ	*-ofsG			bank ID byte (ROM/RAM)
				.DA #1
intadr 			.EQ	*-ofsG			interrupt return address
				.HS 0000
p8date 			.EQ	*-ofsG			bits 15-9=yr, 8-5=mo, 4-0=day
				.HS 0000
p8time 			.EQ	*-ofsG			bits 12-8=hr, 5-0=min, low-hi format
				.HS 0000
flevel  		.EQ	*-ofsG			current file level
				.DA #0
bubit  			.EQ	*-ofsG			backup bit disable, setfileinfo only
				.DA #0
spare1			.EQ	*-ofsG	used to save acc
				.DA #0
newpfxptr 		.EQ	*-ofsG			appletalk alternate prefix ptr
				.DA #0
*machid 		.EQ	*-ofsG			machine ID byte
				.DA #0
rommap 			.EQ	*-ofsG			slot ROM bit map
				.DA #0
preflag  		.EQ	*-ofsG			prefix active flag
				.DA #0
mliact 			.EQ	*-ofsG			MLI active flag
				.DA #0
mliretn  		.EQ	*-ofsG			last MLI call return address
				.DA 0
mlix   			.EQ	*-ofsG			MLI X register savearea
				.DA #0
mliy   			.EQ	*-ofsG			MLI Y register savearea
				.DA #0

* language card bank switching routines which must reside at $BFA0 because
* workstation software patches this area

HBFA0			.EQ	*-ofsG
GP.HBFA0		eor $E000			test for rom enable
				beq .1	  			taken if ram enabled
				sta RROMBNK2			read ROM
				bne .2	 			always
.1			  	lda bnkbyt2			for alternate ram
				eor $D000			test
				beq .2				branch if not alternate ram
				lda RRAMWRAMBNK2			else enable alt $D000
.2  			pla		 			 return code
				rti		  			re-enable interrupts and return

mlicont			.EQ	*-ofsG
				sec
				ror mliact	   notify interrupt routines MLI active.
				lda $E000		preserve language card/rom orientation
				sta bnkbyt1	  for proper restoration when mli exits.
				lda $D000
				sta bnkbyt2
				lda RRAMWRAMBNK1			force ram card on
				lda RRAMWRAMBNK1		with write allowed
				jmp xdosmli	

irqexit			.EQ	*-ofsG
				lda bankid	   			determine state of ram card (ROM/RAM)

irqxit0			.EQ	*-ofsG
GP.irqxit0		beq .2					branch if ram card enabled.
				bmi .1					branch if alternate $D000 enabled.

				lsr						determine if no ram card present.
				bcc .3		branch if rom only system.

				lda RROMWRAMBNK2	   enable rom
				bcs .3		always taken

.1	  			lda RRAMWRAMBNK2			enable alternate $D000
.2	  			lda #$01	   preset bankid for rom.
				sta bankid	   (reset if ram card interrupt)
.3				lda	p8areg	  restore acc
				rti		  exit

irqent			.EQ	*-ofsG			this entry only used when rom
				bit	RRAMWRAMBNK1	   was enabled at time of interrupt.
				bit	RRAMWRAMBNK1
				jmp	irqrecev

bnkbyt1			.EQ	*-ofsG
				.DA #0
bnkbyt2			.EQ	*-ofsG
				.DA #0
				.HS 00000000		pad to before $BFFA
				.DA #4			gsos compatibility byte ($BFFA)
				.DA #0			pad
				.DA #0			reserved
				.DA #0			version # of running interpreter
				.DA #0			preserved for System Utilities
kversion		.EQ	*-ofsG			kernal version
				.HS 23			represents release 2.0.3

* end of obj mli_1
*--------------------------------------
MAN
SAVE USR/SRC/PRODOS.203/PRODOS.S.GP
LOAD USR/SRC/PRODOS.203/PRODOS.S
ASM