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104 lines
2.3 KiB
104 lines
2.3 KiB
;
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;==================================================================================================
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; EZ80 50/60HZ TIMER TICK DRIVER
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;==================================================================================================
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;
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; Communicate with on-chip eZ80 firmware to:
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; 1. Exchange platform version numbers
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; 2. Configure memory banking type
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; 3. Retrieve CPU Frequency
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; 4. Set Memory and I/O Bus Timings
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; 5. Set Timer Tick Frequency
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;
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EZ80_PREINIT:
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EZ80_TMR_INT_DISABLE()
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; PROVIDE THE EZ80 FIRMWARE WITH PLATFORM CONFIGUATIONS
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LD C, 1 ; RomWBW'S ASSIGNED CODE
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LD D, RMJ
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LD E, RMN
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LD H, RUP
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LD L, RTP
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EZ80_UTIL_VER_EXCH()
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; TODO CHECK RETURNED VERSION AND WARN IF NOT GOOD
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; EXPECT A VERSION NUMBER > 0.1.0.0
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LD C, MEMMGR
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LD HL, ROMSIZE
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LD DE, RAMSIZE
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EZ80_UTIL_BNK_HLP() ; INSTAL HIGH PERFORMANCE BANK SWITCHER
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; TODO CHECK RESULT AND USE STANDARD BANK SWITCHER IF NZ RETURNED
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; OTHERWISE USE RST.L %18 FOR BANK SWITCH HELPER
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EZ80_UTIL_GET_CPU_FQ()
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LD A, E
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LD (CB_CPUMHZ), A
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LD (CB_CPUKHZ), HL
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LD (HB_CPUOSC), HL
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#IF (EZ80_ASSIGN == 1)
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LD H, EZ80_MEM_CYCLES
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LD L, EZ80_IO_CYCLES
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EZ80_UTIL_SET_BUSTM()
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#ELSE
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LD HL, EZ80_MEM_FREQ
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LD DE, EZ80_IO_FREQ
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EXX
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LD HL, EZ80_MEM_MINCYC << 8 | EZ80_IO_MINCYC
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EXX
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EZ80_UTIL_SET_BUSFQ()
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#ENDIF
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LD A, H
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LD (EZ80_PLT_C3CYL), A
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LD A, L
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LD (EZ80_PLT_C2CYL), A
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LD C, TICKFREQ
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EZ80_TMR_SET_FREQTICK
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LD A, 5 ; HB_CPUTYPE = 5 FOR eZ80
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LD (HB_CPUTYPE),A
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RET
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EZ80_RPT_TIMINGS:
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LD A,(EZ80_PLT_C3CYL)
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CALL PRTDECB
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CALL PRTSTRD
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.TEXT " MEM B/C, $"
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LD A,(EZ80_PLT_C2CYL)
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CALL PRTDECB
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CALL PRTSTRD
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.TEXT " I/O B/C$"
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RET
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EZ80_PLT_C3CYL:
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.DB EZ80_MEM_CYCLES
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EZ80_PLT_C2CYL:
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.DB EZ80_IO_CYCLES
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; ez80 helper functions/instructions
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_EZ80_CPY_EHL_TO_UHL:
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PUSH IX
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PUSH AF
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.DB $5B, $DD, $21, $00, $00, $00 ; LD.LIL IX, 0
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.DB $49, $DD, $39 ; ADD.L IX, SP
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.DB $49, $E5 ; PUSH.L HL
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.DB $5B, $DD, $73, $FF ; LD.LIL (IX-1), E
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.DB $49, $E1 ; POP.L HL
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POP AF
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POP IX
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RET
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_EZ80_CPY_UHL_TO_EHL:
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PUSH IX
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.DB $5B, $DD, $21, $00, $00, $00 ; LD.LIL IX, 0
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.DB $49, $DD, $39 ; ADD.L IX, SP
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.DB $49, $E5 ; PUSH.L HL
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.DB $5B, $DD, $5E, $FF ; LD.LIL E, (IX-1)
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.DB $49, $E1 ; POP.L HL
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POP IX
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RET
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