mirror of
https://github.com/A2osX/A2osX.git
synced 2024-11-22 00:32:44 +00:00
95 lines
2.3 KiB
Plaintext
95 lines
2.3 KiB
Plaintext
NEW
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AUTO 3,1
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*--------------------------------------
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Z80.pPs .EQ pPs+0F000H
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Z80.pCode .EQ pCode+0F000H
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Z80.pData .EQ pData+0F000H
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Z80.pStack .EQ pStack+0F000H
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Z80.pBase .EQ pBase+0F000H
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*--------------------------------------
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Z80.6502P.N .EQ %10000000
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Z80.6502P.V .EQ %01000000
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Z80.6502P.B .EQ %00010000
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Z80.6502P.D .EQ %00001000
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Z80.6502P.I .EQ %00000100
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Z80.6502P.Z .EQ %00000010
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Z80.6502P.C .EQ %00000001
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*--------------------------------------
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.OP Z80
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.OR 0
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*--------------------------------------
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* First time entry point after reset
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* Called from Kernel.Init2
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*--------------------------------------
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Z80.Init ld SP,000FFH Init Stack to 000FFH ($10ff)
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ld A,0FFH Set Flag...
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ld Z80.6502A,A ...in 6502 A reg
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im 1
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ei
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jr Z80.Exit
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*--------------------------------------
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.BS 00038h-*
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*--------------------------------------
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Z80.Irq push AF
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push BC
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push DE
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push HL
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push IX
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push IY
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ld (Z80.pStack),SP
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*--------------------------------------
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Z80.Exit ld Z80.IOz,A exit to 6502, falling in main loop for next call
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*--------------------------------------
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* Called from :
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* - CORE.PSExec : Z80.6502X = PS.INIT/PS.RUN/PS.DOEVENT/PS.QUIT
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* - CORE.PSExec : Resume
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* - SYSCALL Return
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* - LIBCALL Return
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* -
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*--------------------------------------
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Z80.Enter ld A,(Z80.6502X) get 6502,X
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cp A,PS.RESUME
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jpz Z80.Resume
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ld L,A
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ld H,0 HL=offset in jump table
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ld DE,(Z80.pCode) DE=Code Base
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add DE,4 skip header
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add HL,DE HL=CodeBase+4+X
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ld A,(HL) get jmp lo at X
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inc HL
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ld H,(HL) get jmp hi at X+1
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ld L,A
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call Z80.JumpHL
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ld Z80.6502A,A
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*--------------------------------------
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Z80.Resume ld SP,(Z80.pStack)
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pop IY
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pop IX
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pop HL
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pop DE
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pop BC
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pop AF
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ei
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reti
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*--------------------------------------
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*--------------------------------------
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Z80.SYSCALL ld
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*--------------------------------------
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Z80.LIBCALL
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*--------------------------------------
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Z80.JumpHL jp (HL)
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*--------------------------------------
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Z80.IOz .DA 0E100H
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Z80.6502A .BS 1
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Z80.6502X .BS 1
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Z80.6502Y .BS 1
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Z80.6502P .BS 1
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*--------------------------------------
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MAN
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SAVE usr/src/sys/kernel.s.z80
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LOAD usr/src/sys/kernel.s
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ASM
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