40 lines
494 B
NASM
40 lines
494 B
NASM
%include "ponydos.inc"
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cpu 8086
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bits 16
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; 0x0000
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jmp near process_event
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; 0x0003 PROC_INITIALIZE_ENTRYPOINT
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; This needs to preserve ds
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initialize:
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push ds
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call deallocate_own_memory
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pop ds
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retf
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process_event:
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retf
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deallocate_own_memory:
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push bx
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push cx
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push es
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mov bx, PONYDOS_SEG
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mov es, bx
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; Segment 0xn000 corresponds to slot n in the allocation table
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mov bx, cs
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mov cl, 12
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shr bx, cl
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mov byte [es:GLOBAL_MEMORY_ALLOCATION_MAP + bx], 0
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pop es
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pop cx
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pop bx
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ret
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