summaryrefslogtreecommitdiffstats
path: root/src/in/cpu.asm
blob: 7f9497d039a174909c85e8e319fc99ba092832d7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
tpu X0 Y0
	## ${ADDR_CPU}

	# read rip
	mov ${ADDR_RIP}, RIGHT
	mov ${ADDR_CPU}, RIGHT
	mov ${MEM_OP_READ}, RIGHT
	mov 0x00, RIGHT
	mov ${OP_NIL}, RIGHT

	# get ack
	mov UP, NIL
	mov UP, NIL
	mov UP, ACC
	mov UP, NIL

	# read inst
	sav
	shr 6
	add ${ADDR_MEMORY_BASE}
	mov ACC, RIGHT
	swp
	mov ${ADDR_CPU}, RIGHT
	mov ${MEM_OP_READ}, RIGHT
	mov ACC, RIGHT
	mov ${OP_NIL}, RIGHT

	# get ack
	swp
	mov UP, NIL
	mov UP, NIL
	mov UP, ACC
	mov UP, NIL
	swp

	# write rip+1
	add 1
	mov ${ADDR_RIP}, RIGHT
	mov ${ADDR_CPU}, RIGHT
	mov ${MEM_OP_WRITE}, RIGHT
	mov 0x00, RIGHT
	mov ACC, RIGHT

	# get ack
	mov UP, NIL
	mov UP, NIL
	mov UP, NIL
	mov UP, NIL
	swp

	# run inst
	mov ${ADDR_DECODER}, RIGHT
	mov ${ADDR_CPU}, RIGHT
	mov ACC, RIGHT
	mov ${OP_NIL}, RIGHT
	mov ${OP_NIL}, RIGHT

	# get ack
	mov UP, NIL
	mov UP, NIL
	mov UP, NIL
	mov UP, NIL
end

tpu X1 Y0
	mov LEFT, UP
end