/ machine language assist
/ for 11/45 or 11/70 CPUs


/ non-UNIX instructions
mfpi	= 6500^tst
mtpi	= 6600^tst
mfpd	= 106500^tst
mtpd	= 106600^tst
spl	= 230
ldfps	= 170100^tst
stfps	= 170200^tst
wait	= 1
rtt	= 6
reset	= 5
halt	= 0

HIPRI	= 300
HIGH	= 6

/ Rk disk dump
/ save registers in low core and
/ write all core onto disk.
/ entry is thru 44 abs

.data
.globl	dump, dmper, dmpdn
dump:
	bit	$1,SSR0
	bne	dump

/ save regs r0,r1,r2,r3,r4,r5,r6,KIA6
/ starting at abs location 4

	mov	r0,4
	mov	$6,r0
	mov	r1,(r0)+
	mov	r2,(r0)+
	mov	r3,(r0)+
	mov	r4,(r0)+
	mov	r5,(r0)+
	mov	sp,(r0)+
	mov	KDSA6,(r0)+

/ dump all of core onto disk

	RKDS = 177400
	RKER = 177402
	RKCS = 177404
	RKWC = 177406
	RKBA = 177410
	RKDA = 177412

	DROZ = 020000		/ Drive 1, cyl/surf/sect 0

	clr	RKBA
	mov	$DROZ,	RKDA
	clr	r0

	bit	$200,	RKCS
	bne	2f

dmper:	mov	$-1,	CSW
	halt

2:
	mov	$100000,RKWC
	bis	$3,	RKCS
1:	bit	$200,	RKCS
	beq	1b
	cmp	r0,	$3
	beq	3f
	inc	r0
	br	2b

3:	mov	$52525,	CSW
dmpdn:	halt

.globl	start, _end, _edata, _etext, _main

/ 11/45 and 11/70 startup.
/ entry is thru 0 abs.
/ since core is shuffled,
/ this code can be executed but once

start:
	inc	$-1
	bne	.
	reset
/ Set loc. 0 to trap to system, in case of
/ hardware glitch
	mov	$trap,0		/ in case of bad trap through 0
	mov	$340+15.,2	/ high pri, trap type 15
	clr	PS

/ set KI0 to physical 0

	mov	$77406,r3
	mov	$KISA0,r0
	mov	$KISD0,r1
	clr	(r0)+
	mov	r3,(r1)+

/ set KI1-6 to eventual text resting place

	mov	$_end+63.,r2
	ash	$-6,r2
	bic	$!1777,r2
1:
	mov	r2,(r0)+
	mov	r3,(r1)+
	add	$200,r2
	cmp	r0,$KISA7
	blos	1b

/ set KI7 to IO seg for escape

	mov	$IO,-(r0)

/ set KD0-7 to physical

	mov	$KDSA0,r0
	mov	$KDSD0,r1
	clr	r2
1:
	mov	r2,(r0)+
	mov	r3,(r1)+
	add	$200,r2
	cmp	r0,$KDSA7
	blos	1b

/ initialization
/ get a temp (1-word) stack
/ turn on segmentation
/ copy text to I space
/ clear bss in D space

	mov	$stk+2,sp
	mov	$65,SSR3		/ 22-bit, map, K+U sep
	bit	$20,SSR3
	beq	1f
	mov	$70.,_cputype
	mov	$3,*$MSCR		/ Disable UNIBUS traps, non-fatal traps
1:
	inc	SSR0
	mov	$_etext+100,r2
	mov	$_edata+100,r1
	add	$_etext-8192.,r1
1:
	mov	-(r1),-(sp)
	mtpi	-(r2)
	cmp	r1,$_edata
	bhi	1b
1:
	clr	(r1)+
	cmp	r1,$_end
	blo	1b

/ use KI escape to set KD7 to IO seg
/ set KD6 to first available core

	mov	$IO,-(sp)
	mtpi	*$KDSA7
	mov	$_etext-8192.+63.,r2
	ash	$-6,r2
	bic	$!1777,r2
	add	KISA1,r2
	mov	r2,KDSA6

/ Turn off write permission on kernel text
/ Take stuff above data out of address space

	mov	$KISD0,r0
1:
	mov	$77402,(r0)+
	cmp	r0,$KISD7
	blo	1b

	mov	$_end+63.,r0
	ash	$-6,r0
	bic	$!1777,r0
	mov	$KDSD0,r1
1:
	cmp	r0,$200
	bge	2f
	dec	r0
	bge	4f
	clr	(r1)
	br	3f
4:
	movb	r0,1(r1)
	br	3f
2:
	movb	$177,1(r1)
3:
	tst	(r1)+
	sub	$200,r0
	cmp	r1,$KDSD5
	blos	1b

/ set up supervisor D registers

	mov	$6,SISD0
	mov	$6,SISD1

/ set up real sp
/ clear user block

	mov	$_u+[usize*64.],sp
	mov	$_u,r0
1:
	clr	(r0)+
	cmp	r0,sp
	blo	1b
/	jsr	pc,_isprof

/ set up previous mode and call main
/ on return, enter user mode at 0R

	mov	$30000,PS
	jsr	pc,_main
	mov	$170000,-(sp)
	clr	-(sp)
	rtt

.globl	trap, call
.globl	_trap

/ all traps and interrupts are
/ vectored thru this routine.

trap:
	mov	PS,saveps
	tst	nofault
	bne	1f
	mov	SSR0,ssr
	mov	SSR1,ssr+2
	mov	SSR2,ssr+4
	mov	$1,SSR0
	jsr	r0,call1; _trap
	/ no return
1:
	mov	$1,SSR0
	mov	nofault,(sp)
	rtt
.text

.globl	_runrun, _swtch
call1:
	mov	saveps,-(sp)
	spl	0
	br	1f

call:
	mov	PS,-(sp)
1:
	mov	r1,-(sp)
	mfpd	sp
	mov	4(sp),-(sp)
	bic	$!37,(sp)
	bit	$30000,PS
	beq	1f
	jsr	pc,*(r0)+
2:
	spl	HIGH
	tstb	_runrun
	beq	2f
	spl	0
	jsr	pc,_savfp
	jsr	pc,_swtch
	br	2b
2:
	tst	(sp)+
	mtpd	sp
	br	2f
1:
	bis	$30000,PS
	jsr	pc,*(r0)+
	cmp	(sp)+,(sp)+
2:
	mov	(sp)+,r1
	tst	(sp)+
	mov	(sp)+,r0
	rtt

.globl	_savfp
_savfp:
	rts	pc

.globl	_incupc
_incupc:
	mov	r2,-(sp)
	mov	6(sp),r2	/ base of prof with base,leng,off,scale
	mov	4(sp),r0	/ pc
	sub	4(r2),r0	/ offset
	clc
	ror	r0
	mul	6(r2),r0	/ scale
	ashc	$-14.,r0
	inc	r1
	bic	$1,r1
	cmp	r1,2(r2)	/ length
	bhis	1f
	add	(r2),r1		/ base
	mov	nofault,-(sp)
	mov	$2f,nofault
	mfpd	(r1)
	inc	(sp)
	mtpd	(r1)
	br	3f
2:
	clr	6(r2)
3:
	mov	(sp)+,nofault
1:
	mov	(sp)+,r2
	rts	pc

.globl	_display
_display:
	dec	dispdly
	bge	2f
	clr	dispdly
	mov	PS,-(sp)
	mov	$HIPRI,PS
	mov	CSW,r1
	bit	$1,r1
	beq	1f
	bis	$30000,PS
	dec	r1
1:
	jsr	pc,fuword
	mov	r0,CSW
	mov	(sp)+,PS
	cmp	r0,$-1
	bne	2f
	mov	$120.,dispdly		/ 2 sec delay after CSW fault
2:
	rts	pc

/ Character list get/put

.globl	_getc, _putc, _unputc
.globl	_cfreelist

_getc:
	mov	2(sp),r1
	mov	PS,-(sp)
	mov	r2,-(sp)
	spl	6
	mov	2(r1),r2	/ first ptr
	beq	9f		/ empty
	movb	(r2)+,r0	/ character
	bic	$!377,r0
	mov	r2,2(r1)
	dec	(r1)+		/ count
	bne	1f
	clr	(r1)+
	clr	(r1)+		/ last block
	br	2f
1:
	bit	$7,r2
	bne	3f
	mov	-10(r2),(r1)	/ next block
	add	$2,(r1)
2:
	dec	r2
	bic	$7,r2
	mov	_cfreelist,(r2)
	mov	r2,_cfreelist
3:
	mov	(sp)+,r2
	mov	(sp)+,PS
	rts	pc
9:
	clr	4(r1)
	mov	$-1,r0
	mov	(sp)+,r2
	mov	(sp)+,PS
	rts	pc

_putc:
	mov	2(sp),r0
	mov	4(sp),r1
	mov	PS,-(sp)
	mov	r2,-(sp)
	mov	r3,-(sp)
	spl	6
	mov	4(r1),r2	/ last ptr
	bne	1f
	mov	_cfreelist,r2
	beq	9f
	mov	(r2),_cfreelist
	clr	(r2)+
	mov	r2,2(r1)	/ first ptr
	br	2f
1:
	bit	$7,r2
	bne	2f
	mov	_cfreelist,r3
	beq	9f
	mov	(r3),_cfreelist
	mov	r3,-10(r2)
	mov	r3,r2
	clr	(r2)+
2:
	movb	r0,(r2)+
	mov	r2,4(r1)
	inc	(r1)		/ count
	clr	r0
	mov	(sp)+,r3
	mov	(sp)+,r2
	mov	(sp)+,PS
	rts	pc
9:
	mov	pc,r0
	mov	(sp)+,r3
	mov	(sp)+,r2
	mov	(sp)+,PS
	rts	pc

_unputc:			/ Mike Patrick, June 76
				/ (used in tty.c)
	mov 	2(sp),r1	/ ptr to c_cc into r1
	mov 	PS,-(sp)	/ state onto stack
	mov	r2,-(sp)	/ also r2
	mov	r3,-(sp)
	spl	5

	mov	4(r1),r2	/ c_cl into r2
	beq	5f		/ if 0, empty queue
	dec	r2		/ Last char put in
	movb	(r2),r0		/ char into r0
	dec	(r1)+		/ decrement count, advance r1
	beq	4f		/ if zilch, empty queue now
	bit	$5,r2		/ check if emptied block
	bne	3f		/ if not 010b, return. (can't be 000b)
	bic	$7,r2		/ point to c_next
	mov	_cfreelist,(r2)	/ put empty block on freelist
	mov	r2,_cfreelist
	mov	(r1),r3		/ c_cf into r3
	bic	$7,r3		/ ptr to next block down the line
1:	cmp	(r3),r2		/ block preceding c_cl's ?
	beq	2f
	mov	(r3),r3		/ nope, move down the line
	br	1b
2:				/ yep 
	clr	(r3)		/ end of list
	mov	r3,r2
	add	$10,r2		/ r2 now points past last char put in
3:
	mov	r2,2(r1)	/ New c_cl
	br	9f		/ return

4:	clr	(r1)+		/ c_cf zeroed
	clr	(r1)+		/ c_cl   "
	bic	$7,r2
	mov	_cfreelist,(r2)	/ put block on freelist
	mov	r2,_cfreelist
	br	9f		/ return

5:	mov	$-1,r0		/ error condition

9:
	mov	(sp)+,r3	/ restore state
	mov	(sp)+,r2	
	mov	(sp)+,PS
	rts	pc		/ bye!

.globl	_backup
.globl	_regloc
_backup:
	mov	2(sp),r0
	movb	ssr+2,r1
	jsr	pc,1f
	movb	ssr+3,r1
	jsr	pc,1f
	movb	_regloc+7,r1
	asl	r1
	add	r0,r1
	mov	ssr+4,(r1)
	clr	r0
2:
	rts	pc
1:
	mov	r1,-(sp)
	asr	(sp)
	asr	(sp)
	asr	(sp)
	bic	$!7,r1
	movb	_regloc(r1),r1
	asl	r1
	add	r0,r1
	sub	(sp)+,(r1)
	rts	pc


.globl	_fubyte, _subyte
.globl	_fuword, _suword
.globl	_fuibyte, _suibyte
.globl	_fuiword, _suiword
_fuibyte:
	mov	2(sp),r1
	bic	$1,r1
	jsr	pc,giword
	br	2f

_fubyte:
	mov	2(sp),r1
	bic	$1,r1
	jsr	pc,gword

2:
	cmp	r1,2(sp)
	beq	1f
	swab	r0
1:
	bic	$!377,r0
	rts	pc

_suibyte:
	mov	2(sp),r1
	bic	$1,r1
	jsr	pc,giword
	mov	r0,-(sp)
	cmp	r1,4(sp)
	beq	1f
	movb	6(sp),1(sp)
	br	2f
1:
	movb	6(sp),(sp)
2:
	mov	(sp)+,r0
	jsr	pc,piword
	clr	r0
	rts	pc

_subyte:
	mov	2(sp),r1
	bic	$1,r1
	jsr	pc,gword
	mov	r0,-(sp)
	cmp	r1,4(sp)
	beq	1f
	movb	6(sp),1(sp)
	br	2f
1:
	movb	6(sp),(sp)
2:
	mov	(sp)+,r0
	jsr	pc,pword
	clr	r0
	rts	pc

_fuiword:
	mov	2(sp),r1
fuiword:
	jsr	pc,giword
	rts	pc

_fuword:
	mov	2(sp),r1
fuword:
	jsr	pc,gword
	rts	pc

giword:
	mov	PS,-(sp)
	spl	HIGH
	mov	nofault,-(sp)
	mov	$err,nofault
	mfpi	(r1)
	mov	(sp)+,r0
	br	1f

gword:
	mov	PS,-(sp)
	spl	HIGH
	mov	nofault,-(sp)
	mov	$err,nofault
	mfpd	(r1)
	mov	(sp)+,r0
	br	1f

_suiword:
	mov	2(sp),r1
	mov	4(sp),r0
suiword:
	jsr	pc,piword
	rts	pc

_suword:
	mov	2(sp),r1
	mov	4(sp),r0
suword:
	jsr	pc,pword
	rts	pc

piword:
	mov	PS,-(sp)
	spl	HIGH
	mov	nofault,-(sp)
	mov	$err,nofault
	mov	r0,-(sp)
	mtpi	(r1)
	br	1f

pword:
	mov	PS,-(sp)
	spl	HIGH
	mov	nofault,-(sp)
	mov	$err,nofault
	mov	r0,-(sp)
	mtpd	(r1)
1:
	mov	(sp)+,nofault
	mov	(sp)+,PS
	rts	pc

err:
	mov	(sp)+,nofault
	mov	(sp)+,PS
	tst	(sp)+
	mov	$-1,r0
	rts	pc

.globl	_copyin, _copyout
.globl	_copyiin, _copyiout
_copyiin:
	jsr	pc,copsu
1:
	mfpi	(r0)+
	mov	(sp)+,(r1)+
	sob	r2,1b
	br	2f

_copyin:
	jsr	pc,copsu
1:
	mfpd	(r0)+
	mov	(sp)+,(r1)+
	sob	r2,1b
	br	2f

_copyiout:
	jsr	pc,copsu
1:
	mov	(r0)+,-(sp)
	mtpi	(r1)+
	sob	r2,1b
	br	2f

_copyout:
	jsr	pc,copsu
1:
	mov	(r0)+,-(sp)
	mtpd	(r1)+
	sob	r2,1b
2:
	mov	(sp)+,nofault
	mov	(sp)+,r2
	clr	r0
	rts	pc

copsu:
	mov	(sp)+,r0
	mov	r2,-(sp)
	mov	nofault,-(sp)
	mov	r0,-(sp)
	mov	10(sp),r0
	mov	12(sp),r1
	mov	14(sp),r2
	asr	r2
	mov	$1f,nofault
	rts	pc

1:
	mov	(sp)+,nofault
	mov	(sp)+,r2
	mov	$-1,r0
	rts	pc

.globl	_idle, _waitloc
_idle:
	mov	PS,-(sp)
	spl	0
	wait
_waitloc:
	mov	(sp)+,PS
	rts	pc

.globl	_boot			/ Reboot system from hdw bootstrap
_boot:	jmp	*$173220	/ No return

.globl	_savu, _retu, _aretu
_savu:
	spl	HIGH
	mov	(sp)+,r1
	mov	(sp),r0
	mov	sp,(r0)+
	mov	r5,(r0)+
	spl	0
	jmp	(r1)

_aretu:
	spl	7
	mov	(sp)+,r1
	mov	(sp),r0
	br	1f

_retu:
	spl	7
	mov	(sp)+,r1
	mov	(sp),KDSA6
	mov	$_u,r0
1:
	mov	(r0)+,sp
	mov	(r0)+,r5
	spl	0
	jmp	(r1)

.globl	_spl0, _spl1, _spl4, _spl5, _spl6, _spl7
_spl0:
	spl	0
	rts	pc

_spl1:
	spl	1
	rts	pc

_spl4:
	spl	4
	rts	pc

_spl5:
	spl	5
	rts	pc

_spl6:
	spl	6
	rts	pc

_spl7:
	spl	HIGH
	rts	pc

.globl	_copyseg
_copyseg:
	mov	PS,-(sp)
	mov	4(sp),SISA0
	mov	6(sp),SISA1
	mov	$10000+HIPRI,PS
	mov	r2,-(sp)
	clr	r0
	mov	$8192.,r1
	mov	$32.,r2
1:
	mfpd	(r0)+
	mtpd	(r1)+
	sob	r2,1b
	mov	(sp)+,r2
	mov	(sp)+,PS
	rts	pc

.globl	_clearseg
_clearseg:
	mov	PS,-(sp)
	mov	4(sp),SISA0
	mov	$10000+HIPRI,PS
	clr	r0
	mov	$32.,r1
1:
	clr	-(sp)
	mtpd	(r0)+
	sob	r1,1b
	mov	(sp)+,PS
	rts	pc

.globl	_dpadd
_dpadd:
	mov	2(sp),r0
	add	4(sp),2(r0)
	adc	(r0)
	rts	pc

.globl	_dpcmp
_dpcmp:
	mov	2(sp),r0
	mov	4(sp),r1
	sub	6(sp),r0
	sub	8(sp),r1
	sbc	r0
	bge	1f
	cmp	r0,$-1
	bne	2f
	cmp	r1,$-512.
	bhi	3f
2:
	mov	$-512.,r0
	rts	pc
1:
	bne	2f
	cmp	r1,$512.
	blo	3f
2:
	mov	$512.,r1
3:
	mov	r1,r0
	rts	pc

.globl	_ldiv
_ldiv:
	clr	r0
	mov	2(sp),r1
	div	4(sp),r0
	rts	pc

.globl	_lrem
_lrem:
	clr	r0
	mov	2(sp),r1
	div	4(sp),r0
	mov	r1,r0
	rts	pc

.globl	_lshift
_lshift:
	mov	2(sp),r1
	mov	(r1)+,r0
	mov	(r1),r1
	ashc	4(sp),r0
	mov	r1,r0
	rts	pc

.globl	csv
csv:
	mov	r5,r0
	mov	sp,r5
	mov	r4,-(sp)
	mov	r3,-(sp)
	mov	r2,-(sp)
	jsr	pc,(r0)

.globl cret
cret:
	mov	r5,r2
	mov	-(r2),r4
	mov	-(r2),r3
	mov	-(r2),r2
	mov	r5,sp
	mov	(sp)+,r5
	rts	pc

.globl	_u
_u	= 140000
usize	= 16.

CSW	= 177570
PS	= 177776
SSR0	= 177572
SSR1	= 177574
SSR2	= 177576
SSR3	= 172516
KISA0	= 172340
KISA1	= 172342
KISA7	= 172356
KISD0	= 172300
KISD7	= 172316
KDSA0	= 172360
KDSA6	= 172374
KDSA7	= 172376
KDSD0	= 172320
KDSD5	= 172332
MTC	= 172522
SISA0	= 172240
SISA1	= 172242
SISD0	= 172200
SISD1	= 172202
UBMAP   = 170200        / UNIBUS map registers
MSCR    = 177746        / 11/70 memory control register
IO	= 177600

.data
.globl	_ka6
.globl	_cputype

_ka6:	KDSA6
_cputype:45.
stk:	0

.bss
.globl	nofault, ssr
nofault:.=.+2
ssr:	.=.+6
dispdly:.=.+2
saveps:	.=.+2

.text
/ system profiler
/
/rtt	= 6
/CCSB	= 172542
/CCSR	= 172540
/PS	= 177776
/
/.globl	_sprof, _xprobuf, _probuf, _probsiz, _mode
/_probsiz = 7500.+2048.
/
/_isprof:
/	mov	$_sprof,104	/ interrupt
/	mov	$340,106	/ pri
/	mov	$100.,CCSB	/ count set = 100
/	mov	$113,CCSR	/ count down, 10kHz, repeat
/	rts	pc
/
/_sprof:
/	mov	r0,-(sp)
/	mov	PS,r0
/	ash	$-11.,r0
/	bic	$!14,r0
/	add	$1,_mode+2(r0)
/	adc	_mode(r0)
/	cmp	r0,$14		/ user
/	beq	done
/	mov	2(sp),r0	/ pc
/	asr	r0
/	asr	r0
/	bic	$140001,r0
/	cmp	r0,$_probsiz
/	blo	1f
/	inc	_outside
/	br	done
/1:
/	inc	_probuf(r0)
/	bne	done
/	mov	r1,-(sp)
/	mov	$_xprobuf,r1
/2:
/	cmp	(r1)+,r0
/	bne	3f
/	inc	(r1)
/	br	4f
/3:
/	tst	(r1)+
/	bne	2b
/	sub	$4,r1
/	mov	r0,(r1)+
/	mov	$1,(r1)+
/4:
/	mov	(sp)+,r1
/done:
/	mov	(sp)+,r0
/	mov	$113,CCSR
/	rtt
/
/.bss
/_xprobuf:	.=.+512.
/_probuf:.=.+_probsiz
/_mode:	.=.+16.
/_outside: .=.+2