25 lines
529 B
ArmAsm
25 lines
529 B
ArmAsm
// #LAYOUT# STD * #TAKE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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hw_entry_nmi:
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sei // do not allow IRQ to interfere, see https://www.c64-wiki.com/wiki/Interrupt
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#if CONFIG_CPU_MOS_6502 && CONFIG_BCD_SAFE_INTERRUPTS
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cld // clear decimal flag to allow using it without disabling interrupts
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#endif
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// Call interrupt routine (only if initialised)
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pha
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lda NMINV
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ora NMINV+1
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beq !+
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pla
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jmp (NMINV)
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!:
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// Vector not initialized - call default interrupt routine
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pla
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jmp default_nmi_handler
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