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Commit | Line | Data |
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1 | title 'Boot loader module for CP/M 3.0'\r | |
2 | \r | |
3 | \r | |
4 | \r | |
5 | public hwinit,?init,?ldccp,?rlccp\r | |
6 | \r | |
7 | public f_cpu\r | |
8 | \r | |
9 | extrn ?boot,?pmsg,?conin\r | |
10 | extrn ioini1l,msginit,mmuinit,intinit,cpu_frq\r | |
11 | extrn @civec,@covec,@aivec,@aovec,@lovec\r | |
12 | extrn @cbnk,?bnksl\r | |
13 | \r | |
14 | include config.inc\r | |
15 | include z180reg.inc\r | |
16 | \r | |
17 | \r | |
18 | bdos equ 5\r | |
19 | \r | |
20 | ccpsize equ 0c80h\r | |
21 | \r | |
22 | if banked\r | |
23 | tpa$bank equ 1\r | |
24 | else\r | |
25 | tpa$bank equ 0\r | |
26 | endif\r | |
27 | \r | |
28 | \r | |
29 | dseg ; init done from banked memory\r | |
30 | \r | |
31 | hwinit:\r | |
32 | ld a,(INIDONE)\r | |
33 | cp INIDONEVAL\r | |
34 | jr z,hwini_skip\r | |
35 | ld hl,hwini_tab\r | |
36 | call ioini1l\r | |
37 | ld a,0c3h\r | |
38 | ld hl,?boot\r | |
39 | ld (0),a\r | |
40 | ld (1),hl\r | |
41 | hwini_skip:\r | |
42 | call mmuinit ; setup mmu registers\r | |
43 | call msginit\r | |
44 | call cpu_frq\r | |
45 | ld (f_cpu),de\r | |
46 | ld (f_cpu+2),hl\r | |
47 | ret\r | |
48 | \r | |
49 | ?init:\r | |
50 | ld hl,0100000000000000b ; assign console to ASCI1:\r | |
51 | ld (@civec),hl\r | |
52 | ld (@covec),hl\r | |
53 | ld hl,0000000000000000b ; assign printer to nothing:\r | |
54 | ld (@lovec),hl\r | |
55 | ld hl,0100000000000000b ; assign AUX to ASCI0:\r | |
56 | ld (@aivec),hl\r | |
57 | ld (@aovec),hl\r | |
58 | \r | |
59 | \r | |
60 | call intinit ; setup interrupts and vectors\r | |
61 | \r | |
62 | xor a\r | |
63 | ld (@cbnk),a ; right now in bank 0\r | |
64 | \r | |
65 | ld hl,signon$msg\r | |
66 | call ?pmsg ; print signon message\r | |
67 | ret\r | |
68 | \r | |
69 | \r | |
70 | cseg ; boot loading most be done from resident memory\r | |
71 | \r | |
72 | ; This version of the boot loader loads the CCP from a file\r | |
73 | ; called CCP.COM on the system drive (A:).\r | |
74 | \r | |
75 | \r | |
76 | ?ldccp:\r | |
77 | ; First time, load the A:CCP.COM file into TPA\r | |
78 | xor a\r | |
79 | ld (ccp$fcb+15),a ; zero extent\r | |
80 | ld hl,0\r | |
81 | ld (fcb$nr),hl ; start at beginning of file\r | |
82 | ld de,ccp$fcb\r | |
83 | call open ; open file containing CCP\r | |
84 | inc a\r | |
85 | jp z,no$ccp ; error if no file...\r | |
86 | ld de,0100h\r | |
87 | call setdma ; start of TPA\r | |
88 | ld de,128\r | |
89 | call setmulti ; allow up to 16k bytes\r | |
90 | ld de,ccp$fcb\r | |
91 | call read ; load the thing\r | |
92 | ; now,\r | |
93 | ; copy CCP to bank 0 for reloading\r | |
94 | ld hl,0100h\r | |
95 | ld bc,ccpsize ; clone 3K, just in case\r | |
96 | ld a,(@cbnk)\r | |
97 | push af ; save current bank\r | |
98 | ld$1:\r | |
99 | ld a,tpa$bank\r | |
100 | call ?bnksl ; select TPA\r | |
101 | ld a,(hl)\r | |
102 | push af ; get a byte\r | |
103 | ld a,2\r | |
104 | call ?bnksl ; select extra bank\r | |
105 | pop af\r | |
106 | ld (hl),a ; save the byte\r | |
107 | inc hl\r | |
108 | dec bc ; bump pointer, drop count\r | |
109 | ld a,b\r | |
110 | or c ; test for done\r | |
111 | jp nz,ld$1\r | |
112 | pop af\r | |
113 | call ?bnksl ; restore original bank\r | |
114 | ret\r | |
115 | \r | |
116 | no$ccp: ; here if we couldn't find the file\r | |
117 | ld hl,ccp$msg\r | |
118 | call ?pmsg ; report this...\r | |
119 | call ?conin ; get a response\r | |
120 | jp ?ldccp ; and try again\r | |
121 | \r | |
122 | \r | |
123 | ?rlccp:\r | |
124 | ld hl,0100h\r | |
125 | ld bc,ccpsize ; clone 3K\r | |
126 | rl$1:\r | |
127 | ld a,2\r | |
128 | call ?bnksl ; select extra bank\r | |
129 | ld a,(hl)\r | |
130 | push af ; get a byte\r | |
131 | ld a,tpa$bank\r | |
132 | call ?bnksl ; select TPA\r | |
133 | pop af\r | |
134 | ld (hl),a ; save the byte\r | |
135 | inc hl\r | |
136 | dec bc ; bump pointer, drop count\r | |
137 | ld a,b\r | |
138 | or c ; test for done\r | |
139 | jp nz,rl$1\r | |
140 | ret\r | |
141 | \r | |
142 | \r | |
143 | ; CP/M BDOS Function Interfaces\r | |
144 | \r | |
145 | open:\r | |
146 | ld c,15\r | |
147 | jp bdos ; open file control block\r | |
148 | \r | |
149 | setdma:\r | |
150 | ld c,26\r | |
151 | jp bdos ; set data transfer address\r | |
152 | \r | |
153 | setmulti:\r | |
154 | ld c,44\r | |
155 | jp bdos ; set record count\r | |
156 | \r | |
157 | read:\r | |
158 | ld c,20\r | |
159 | jp bdos ; read records\r | |
160 | \r | |
161 | \r | |
162 | signon$msg:\r | |
163 | db 13,10,13,10,'CP/M Version 3.0, Z180-Stamp BIOS',13,10,0\r | |
164 | \r | |
165 | ccp$msg:db 13,10,'BIOS Err on A: No CCP.COM file',0\r | |
166 | \r | |
167 | \r | |
168 | ccp$fcb:db 1,'CCP ','COM',0,0,0,0\r | |
169 | ds 16\r | |
170 | fcb$nr: db 0,0,0\r | |
171 | \r | |
172 | \r | |
173 | dseg\r | |
174 | hwini_tab:\r | |
175 | db (hwini0_e-$)/2 ;count\r | |
176 | db rcr,CREFSH ;configure DRAM refresh\r | |
177 | db dcntl,CWAITIO ;wait states\r | |
178 | db ccr,M_NCD ;No Clock Divide\r | |
179 | db cmr,PHI_X2 ;X2 Clock Multiplier\r | |
180 | ;TODO: db omr, ;Operation Mode Control Register\r | |
181 | hwini0_e:\r | |
182 | db 0 ;stop mark\r | |
183 | \r | |
184 | cseg\r | |
185 | f_cpu dw 0,0 ;detected CPU clock frequency [Hz]\r | |
186 | \r | |
187 | end\r |