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Changeset 4f508e6 in buchla-68k for vlib/viint.s
- Timestamp:
- 07/01/2017 02:34:46 PM (7 years ago)
- Branches:
- master
- Children:
- 08e1da1
- Parents:
- f40a309
- File:
-
- 1 edited
-
vlib/viint.s (modified) (1 diff)
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- Unmodified
- Added
- Removed
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vlib/viint.s
rf40a309 r4f508e6 1 *------------------------------------------------------------------------------2 *viint.s -- VSDD Vertical Interval interrupt handler for the Buchla 7003 *Version 17 -- 1989-12-19 -- D.N. Lynx Crowe4 * 5 *VIint6 * 7 *VSDD Vertical Interval interrupt handler. Enables display of8 *any object whose bit is set in vi_ctl. Bit 0 = object 0, etc.9 * 10 *SetPri() uses BIOS(B_SETV, 25, VIint) to set the interrupt11 *vector and lets VIint() enable the object. If vi_dis12 *is set, SetPri() won't enable the interrupt or set the vector13 *so that several objects can be started up at once.14 * 15 *This routine also sets the base address and scroll offset16 *for the score display object if vi_sadr is non-zero,17 *after a delay for VSDD FRAMESTOP synchronization.18 *------------------------------------------------------------------------------1 | ------------------------------------------------------------------------------ 2 | viint.s -- VSDD Vertical Interval interrupt handler for the Buchla 700 3 | Version 17 -- 1989-12-19 -- D.N. Lynx Crowe 4 5 | VIint 6 7 | VSDD Vertical Interval interrupt handler. Enables display of 8 | any object whose bit is set in vi_ctl. Bit 0 = object 0, etc. 9 10 | SetPri() uses BIOS(B_SETV, 25, VIint) to set the interrupt 11 | vector and lets VIint() enable the object. If vi_dis 12 | is set, SetPri() won't enable the interrupt or set the vector 13 | so that several objects can be started up at once. 14 15 | This routine also sets the base address and scroll offset 16 | for the score display object if vi_sadr is non-zero, 17 | after a delay for VSDD FRAMESTOP synchronization. 18 | ------------------------------------------------------------------------------ 19 19 .text 20 * 21 .xdef _VIint *Vertical Interval int. handler22 * 23 .xdef _vi_sadr *score object base address24 .xdef _vi_scrl *score object scroll offset25 .xdef lclsadr *local scroll address26 .xdef lclscrl *local scroll offset27 .xdef vdelay *VSDD scroll delay28 * 29 .xdef VIct1 * VSDD interrupt R1130 .xdef VIct2 * VSDD interrupt R1131 .xdef VIct3 * VSDD interrupt R1132 .xdef VIct4 * VSDD interrupt R1133 * 34 .xref _v_regs *VSDD registers35 .xref _v_odtab *VSDD object descriptor table36 * 37 .xref _vi_clk *scroll delay timer38 .xref _vi_ctl *unblank control word39 .xref _vi_tag *VSDD 'needs service' tag40 * 41 .page 42 * 43 *Miscellaneous equates:44 *----------------------45 * 46 DELAY .equ 17 *FRAMESTOP sync delay in Ms47 STACKSR .equ 32 *offset to sr on stack48 V_BLA .equ 4 *V_BLA (blank) bit number49 VSDD_R5 .equ 10 *VSDD R5 byte offset in _v_regs50 VSDD_R11 .equ 22 *VSDD R11 byte offset in _v_regs51 * 52 VT_BASE .equ 128 *word offset of VSDD Access Table53 * 54 VT_1 .equ VT_BASE+300 *high time55 VT_2 .equ VT_BASE+2 *low time56 *------------------------------------------------------------------------------57 * 58 *Stack picture after movem.l at entry:59 *-------------------------------------60 * 61 *LONG PC +3462 *WORD SR +32 STACKSR63 *LONG A6 +2864 *LONG A2 +2465 *LONG A1 +2066 *LONG A0 +1667 *LONG D3 +1268 *LONG D2 +869 *LONG D1 +470 *LONG D0 +071 * 72 *------------------------------------------------------------------------------73 * 74 .page 75 * 76 *_VIint -- Vertical interval interrupt handler77 *------ -----------------------------------78 _VIint: movem.l d0-d3/a0-a2/a6,-(a7) *save registers79 addi.w # $0100,STACKSR(a7) *raise IPL in sr on the stack80 * 81 move.w _v_regs+VSDD_R11,VIct1 *save the VSDD R11 value82 * 83 tst.w _vi_sadr *see if we should scroll84 beq viunbl *jump if not85 * 86 *------------------------------------------------------------------------------87 *setup delayed scroll parameters88 *------------------------------------------------------------------------------89 move.w _v_regs+VSDD_R5,d0 *get VSDD R590 move.w d0,d1 *save it for later91 andi.w # $0180,d0 *see if we're already in bank 092 beq dlyscrl *jump if so93 * 94 clr.w _v_regs+VSDD_R5 *set bank 095 * 96 move.w _v_regs+VSDD_R11,VIct2 *save the VSDD R11 value97 * 98 vw1a: cmp.w #VT_1,_v_regs+VSDD_R11 *wait for FRAMESTOP99 bcc vw1a *...100 * 101 vw2a: cmp.w #VT_1,_v_regs+VSDD_R11 *...102 bcs vw2a *...103 * 104 vw3a: cmp.w #VT_1,_v_regs+VSDD_R11 *...105 bcc vw3a *...106 * 107 vw4a: cmp.w #VT_2,_v_regs+VSDD_R11 *...108 bcs vw4a *...109 * 110 dlyscrl: tst.w _vi_tag *wait for previous scroll111 bne dlyscrl *...112 * 113 move.w _vi_sadr,lclsadr *save address for timeint114 move.w _vi_scrl,lclscrl *save offset for timeint115 clr.w _vi_sadr *reset for next time116 clr.w _vi_scrl *...117 move.w vdelay,_vi_clk *set the scroll delay timer118 st _vi_tag *set the 'need service' tag119 *------------------------------------------------------------------------------120 *check for unblank requests121 *------------------------------------------------------------------------------122 move.w _vi_ctl,d2 *get the unblank control word123 beq viexit *exit if nothing to unblank124 * 125 bra unblnk *go unblank some objects126 * 127 viunbl: move.w _vi_ctl,d2 *get the unblank control word128 beq vidone *exit if nothing to unblank129 * 130 move.w _v_regs+VSDD_R5,d0 *get VSDD R5131 move.w d0,d1 *save it for later132 andi.w # $0180,d0 *see if we're already in bank 0133 beq unblnk *jump if so134 * 135 clr.w _v_regs+VSDD_R5 *set bank 0136 * 137 move.w _v_regs+VSDD_R11,VIct3 *save the VSDD R11 value138 * 139 vw1b: cmp.w #VT_1,_v_regs+VSDD_R11 *wait for FRAMESTOP140 bcc vw1b *...141 * 142 vw2b: cmp.w #VT_1,_v_regs+VSDD_R11 *...143 bcs vw2b *...144 * 145 vw3b: cmp.w #VT_1,_v_regs+VSDD_R11 *...146 bcc vw3b *...147 * 148 vw4b: cmp.w #VT_2,_v_regs+VSDD_R11 *...149 bcs vw4b *...150 * 151 .page 152 * 153 *------------------------------------------------------------------------------154 *unblank objects indicated by contents of d2 (loaded earlier from _vi_ctl)155 *------------------------------------------------------------------------------156 * 157 unblnk: clr.w d3 *clear the counter158 clr.w _vi_ctl *clear the unblank control word159 lea _v_odtab,a1 *point at first object160 * 161 vicheck: btst d3,d2 *check the object bit162 beq vinext *go check next one if not set163 * 164 move.w (a1),d0 *get v_odtab[obj][0]165 bclr #V_BLA,d0 *clear the blanking bit166 move.w d0,(a1) *set v_odtab[obj][0]167 * 168 vinext: cmpi.w #15,d3 *see if we're done169 beq viexit *jump if so170 * 171 addq.l #8,a1 *point at next object172 addq.w #1,d3 *increment object counter173 bra vicheck *go check next object174 * 175 *------------------------------------------------------------------------------176 *switch back to the bank the interrupted code was using if we changed it177 *------------------------------------------------------------------------------178 * 179 viexit: move.w d1,d0 *see if we were in bank 0180 andi.w # $0180,d0 *...181 beq vidone *jump if so182 * 183 viwait: tst.w _vi_tag *wait for timer to run out184 bne viwait *... so timeint sees bank 0185 * 186 move.w d1,_v_regs+VSDD_R5 *restore v_regs[5] to old bank187 * 188 move.w _v_regs+VSDD_R11,VIct4 *save the VSDD R11 value189 * 190 vw1c: cmp.w #VT_1,_v_regs+VSDD_R11 *wait for FRAMESTOP191 bcc vw1c *...192 * 193 vw2c: cmp.w #VT_1,_v_regs+VSDD_R11 *...194 bcs vw2c *...195 * 196 vw3c: cmp.w #VT_1,_v_regs+VSDD_R11 *...197 bcc vw3c *...198 * 199 vw4c: cmp.w #VT_2,_v_regs+VSDD_R11 *...200 bcs vw4c *...201 * 202 *------------------------------------------------------------------------------203 *restore registers and return to interrupted code204 *------------------------------------------------------------------------------205 * 206 vidone: movem.l (a7)+,d0-d3/a0-a2/a6 *restore registers207 rte *return from interrupt208 * 209 .page 210 * 211 *------------------------------------------------------------------------------20 21 .xdef _VIint | Vertical Interval int. handler 22 23 .xdef _vi_sadr | score object base address 24 .xdef _vi_scrl | score object scroll offset 25 .xdef lclsadr | local scroll address 26 .xdef lclscrl | local scroll offset 27 .xdef vdelay | VSDD scroll delay 28 29 .xdef VIct1 | VSDD interrupt R11 30 .xdef VIct2 | VSDD interrupt R11 31 .xdef VIct3 | VSDD interrupt R11 32 .xdef VIct4 | VSDD interrupt R11 33 34 .xref _v_regs | VSDD registers 35 .xref _v_odtab | VSDD object descriptor table 36 37 .xref _vi_clk | scroll delay timer 38 .xref _vi_ctl | unblank control word 39 .xref _vi_tag | VSDD 'needs service' tag 40 41 .page 42 43 | Miscellaneous equates: 44 | ---------------------- 45 46 DELAY = 17 | FRAMESTOP sync delay in Ms 47 STACKSR = 32 | offset to sr on stack 48 V_BLA = 4 | V_BLA (blank) bit number 49 VSDD_R5 = 10 | VSDD R5 byte offset in _v_regs 50 VSDD_R11 = 22 | VSDD R11 byte offset in _v_regs 51 52 VT_BASE = 128 | word offset of VSDD Access Table 53 54 VT_1 = VT_BASE+300 | high time 55 VT_2 = VT_BASE+2 | low time 56 | ------------------------------------------------------------------------------ 57 58 | Stack picture after movem.l at entry: 59 | ------------------------------------- 60 61 | LONG PC +34 62 | WORD SR +32 STACKSR 63 | LONG A6 +28 64 | LONG A2 +24 65 | LONG A1 +20 66 | LONG A0 +16 67 | LONG D3 +12 68 | LONG D2 +8 69 | LONG D1 +4 70 | LONG D0 +0 71 72 | ------------------------------------------------------------------------------ 73 74 .page 75 76 | _VIint -- Vertical interval interrupt handler 77 | ------ ----------------------------------- 78 _VIint: movem.l d0-d3/a0-a2/a6,-(a7) | save registers 79 addi.w #0x0100,STACKSR(a7) | raise IPL in sr on the stack 80 81 move.w _v_regs+VSDD_R11,VIct1 | save the VSDD R11 value 82 83 tst.w _vi_sadr | see if we should scroll 84 beq viunbl | jump if not 85 86 | ------------------------------------------------------------------------------ 87 | setup delayed scroll parameters 88 | ------------------------------------------------------------------------------ 89 move.w _v_regs+VSDD_R5,d0 | get VSDD R5 90 move.w d0,d1 | save it for later 91 andi.w #0x0180,d0 | see if we're already in bank 0 92 beq dlyscrl | jump if so 93 94 clr.w _v_regs+VSDD_R5 | set bank 0 95 96 move.w _v_regs+VSDD_R11,VIct2 | save the VSDD R11 value 97 98 vw1a: cmp.w #VT_1,_v_regs+VSDD_R11 | wait for FRAMESTOP 99 bcc vw1a | ... 100 101 vw2a: cmp.w #VT_1,_v_regs+VSDD_R11 | ... 102 bcs vw2a | ... 103 104 vw3a: cmp.w #VT_1,_v_regs+VSDD_R11 | ... 105 bcc vw3a | ... 106 107 vw4a: cmp.w #VT_2,_v_regs+VSDD_R11 | ... 108 bcs vw4a | ... 109 110 dlyscrl: tst.w _vi_tag | wait for previous scroll 111 bne dlyscrl | ... 112 113 move.w _vi_sadr,lclsadr | save address for timeint 114 move.w _vi_scrl,lclscrl | save offset for timeint 115 clr.w _vi_sadr | reset for next time 116 clr.w _vi_scrl | ... 117 move.w vdelay,_vi_clk | set the scroll delay timer 118 st _vi_tag | set the 'need service' tag 119 | ------------------------------------------------------------------------------ 120 | check for unblank requests 121 | ------------------------------------------------------------------------------ 122 move.w _vi_ctl,d2 | get the unblank control word 123 beq viexit | exit if nothing to unblank 124 125 bra unblnk | go unblank some objects 126 127 viunbl: move.w _vi_ctl,d2 | get the unblank control word 128 beq vidone | exit if nothing to unblank 129 130 move.w _v_regs+VSDD_R5,d0 | get VSDD R5 131 move.w d0,d1 | save it for later 132 andi.w #0x0180,d0 | see if we're already in bank 0 133 beq unblnk | jump if so 134 135 clr.w _v_regs+VSDD_R5 | set bank 0 136 137 move.w _v_regs+VSDD_R11,VIct3 | save the VSDD R11 value 138 139 vw1b: cmp.w #VT_1,_v_regs+VSDD_R11 | wait for FRAMESTOP 140 bcc vw1b | ... 141 142 vw2b: cmp.w #VT_1,_v_regs+VSDD_R11 | ... 143 bcs vw2b | ... 144 145 vw3b: cmp.w #VT_1,_v_regs+VSDD_R11 | ... 146 bcc vw3b | ... 147 148 vw4b: cmp.w #VT_2,_v_regs+VSDD_R11 | ... 149 bcs vw4b | ... 150 151 .page 152 153 | ------------------------------------------------------------------------------ 154 | unblank objects indicated by contents of d2 (loaded earlier from _vi_ctl) 155 | ------------------------------------------------------------------------------ 156 157 unblnk: clr.w d3 | clear the counter 158 clr.w _vi_ctl | clear the unblank control word 159 lea _v_odtab,a1 | point at first object 160 161 vicheck: btst d3,d2 | check the object bit 162 beq vinext | go check next one if not set 163 164 move.w (a1),d0 | get v_odtab[obj][0] 165 bclr #V_BLA,d0 | clear the blanking bit 166 move.w d0,(a1) | set v_odtab[obj][0] 167 168 vinext: cmpi.w #15,d3 | see if we're done 169 beq viexit | jump if so 170 171 addq.l #8,a1 | point at next object 172 addq.w #1,d3 | increment object counter 173 bra vicheck | go check next object 174 175 | ------------------------------------------------------------------------------ 176 | switch back to the bank the interrupted code was using if we changed it 177 | ------------------------------------------------------------------------------ 178 179 viexit: move.w d1,d0 | see if we were in bank 0 180 andi.w #0x0180,d0 | ... 181 beq vidone | jump if so 182 183 viwait: tst.w _vi_tag | wait for timer to run out 184 bne viwait | ... so timeint sees bank 0 185 186 move.w d1,_v_regs+VSDD_R5 | restore v_regs[5] to old bank 187 188 move.w _v_regs+VSDD_R11,VIct4 | save the VSDD R11 value 189 190 vw1c: cmp.w #VT_1,_v_regs+VSDD_R11 | wait for FRAMESTOP 191 bcc vw1c | ... 192 193 vw2c: cmp.w #VT_1,_v_regs+VSDD_R11 | ... 194 bcs vw2c | ... 195 196 vw3c: cmp.w #VT_1,_v_regs+VSDD_R11 | ... 197 bcc vw3c | ... 198 199 vw4c: cmp.w #VT_2,_v_regs+VSDD_R11 | ... 200 bcs vw4c | ... 201 202 | ------------------------------------------------------------------------------ 203 | restore registers and return to interrupted code 204 | ------------------------------------------------------------------------------ 205 206 vidone: movem.l (a7)+,d0-d3/a0-a2/a6 | restore registers 207 rte | return from interrupt 208 209 .page 210 211 | ------------------------------------------------------------------------------ 212 212 .data 213 *------------------------------------------------------------------------------214 * 215 vdelay: .dc.w DELAY *VSDD scroll delay216 * 217 *------------------------------------------------------------------------------213 | ------------------------------------------------------------------------------ 214 215 vdelay: .dc.w DELAY | VSDD scroll delay 216 217 | ------------------------------------------------------------------------------ 218 218 .bss 219 *------------------------------------------------------------------------------220 * 221 _vi_sadr: .ds.w 1 *score object base address222 _vi_scrl: .ds.w 1 *score object scroll offset223 * 224 lclsadr: .ds.w 1 *local copy of vi_sadr225 lclscrl: .ds.w 1 *local copy of vi_scrl226 * 227 VIct1: .ds.w 1 *VSDD R11 value at interrupt228 VIct2: .ds.w 1 *VSDD R11 value at interrupt229 VIct3: .ds.w 1 *VSDD R11 value at interrupt230 VIct4: .ds.w 1 *VSDD R11 value at interrupt231 * 219 | ------------------------------------------------------------------------------ 220 221 _vi_sadr: .ds.w 1 | score object base address 222 _vi_scrl: .ds.w 1 | score object scroll offset 223 224 lclsadr: .ds.w 1 | local copy of vi_sadr 225 lclscrl: .ds.w 1 | local copy of vi_scrl 226 227 VIct1: .ds.w 1 | VSDD R11 value at interrupt 228 VIct2: .ds.w 1 | VSDD R11 value at interrupt 229 VIct3: .ds.w 1 | VSDD R11 value at interrupt 230 VIct4: .ds.w 1 | VSDD R11 value at interrupt 231 232 232 .end
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