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1 | title 'Bank & Move Module for the Modular CP/M 3 BIOS' | |
2 | ||
3 | ; CP/M-80 Version 3 -- Modular BIOS | |
4 | ; Bank and Move Module for Z180-Stamp | |
5 | ; Initial version 1.0 | |
6 | ; Compile with M80, slr180, or compatible | |
7 | ||
8 | public ?move,?xmove,?bank | |
9 | ||
10 | extrn bnk2log,bnk2phy | |
11 | extrn @cbnk | |
12 | ||
13 | ||
14 | include config.inc | |
15 | include z180reg.inc | |
16 | ||
17 | ||
18 | cseg ; must be in common memory | |
19 | ||
20 | ?xmove: | |
21 | if banked | |
22 | ld (src$bnk),bc ; c -> src$bnk, b -> dst$bnk | |
23 | endif | |
24 | ret | |
25 | ||
26 | ?move: | |
27 | ex de,hl ; we are passed source in DE and dest in HL | |
28 | if banked | |
29 | ld a,(src$bnk) ; contains 0FEh if normal block move | |
30 | cp 0FEh | |
31 | jr nz,inter_bank_move | |
32 | endif | |
33 | ldir ; use Z80 block move instruction | |
34 | ex de,hl ; need next address in same regs | |
35 | ret | |
36 | ||
37 | ; select bank in A | |
38 | ||
39 | ?bank: | |
40 | if banked | |
41 | call bnk2log | |
42 | out0 (bbr),a | |
43 | endif | |
44 | ret | |
45 | ||
46 | if banked | |
47 | ||
48 | inter_bank_move: ; source in HL, dest in DE, count in BC | |
49 | if 0 ; *** DOES NOT WORK PROPERLY | |
50 | ; (Crossing Bank boundary problems) | |
51 | push bc | |
52 | push de | |
53 | push hl | |
54 | ||
55 | ;TODO: check if source range crosses bank/common boundary | |
56 | ||
57 | ld a,(src$bnk) | |
58 | call bnk2phy | |
59 | ||
60 | out0 (sar0l),l ; setup DMA src address | |
61 | out0 (sar0h),h | |
62 | out0 (sar0b),a | |
63 | ||
64 | ;TODO: check if destination range crosses bank/common boundary | |
65 | ||
66 | ex de,hl | |
67 | ld a,(dst$bnk) | |
68 | call bnk2phy | |
69 | ||
70 | out0 (dar0l),l ; setup DMA dst address | |
71 | out0 (dar0h),h | |
72 | out0 (dar0b),a | |
73 | ||
74 | ld a,M_MMOD ; DMA burst mode | |
75 | out0 (dmode),a | |
76 | out0 (bcr0l),c ; setup DMA count | |
77 | out0 (bcr0h),b | |
78 | ld a,M_DE0+M_NDWE1 ; enable DMA0 | |
79 | out0 (dstat),a ; move the block | |
80 | ||
81 | pop hl | |
82 | pop de | |
83 | pop bc | |
84 | ||
85 | add hl,bc ; src must point past end block | |
86 | ex de,hl | |
87 | add hl,bc ; and so must dst | |
88 | ld bc,0 | |
89 | ||
90 | ld a,0FEh | |
91 | ld (src$bnk),a | |
92 | ||
93 | ret ; return with src in DE, dst in HL, count = 0 | |
94 | ||
95 | else ; *** INNEFICIENT, BUT WORKS | |
96 | ||
97 | ld (tmp$sp),sp | |
98 | ld sp,tmp$stk | |
99 | ex af,af' ; | |
100 | push af | |
101 | mv$blk: | |
102 | ld a,(src$bnk) ; | |
103 | call ?bank | |
104 | ld a,(hl) | |
105 | ex af,af' ; | |
106 | ld a,(dst$bnk) | |
107 | call ?bank | |
108 | ex af,af' ; | |
109 | ld (de),a | |
110 | inc hl | |
111 | inc de | |
112 | dec bc | |
113 | ld a,b | |
114 | or c | |
115 | jr nz,mv$blk | |
116 | ld a,(@cbnk) | |
117 | call ?bank | |
118 | ld a,0FEh | |
119 | ld (src$bnk),a | |
120 | ex de,hl | |
121 | pop af | |
122 | ex af,af' ; | |
123 | ld sp,(tmp$sp) | |
124 | ret | |
125 | ||
126 | ds 16 | |
127 | tmp$stk: | |
128 | tmp$sp: ds 2 | |
129 | ||
130 | endif | |
131 | ||
132 | src$bnk: db 0FEh | |
133 | dst$bnk: db 0FEh | |
134 | ||
135 | ||
136 | endif ;banked | |
137 | ||
138 | end |