collapseos/tools/emul/zasm_glue.asm

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NASM
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; Glue code for the emulated environment
.equ RAMSTART 0x4000
.equ USER_CODE 0x4800
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.equ STDIO_PORT 0x00
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.equ STDIN_REWIND 0x01
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jr init ; 2 bytes
; *** JUMP TABLE ***
jp strncmp
jp addDE
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jp addHL
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jp upcase
jp unsetZ
jp intoDE
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jp intoHL
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jp findchar
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jp parseHexPair
jp blkSel
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init:
di
; We put the stack at the end of the kernel memory
ld hl, USER_CODE-1
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ld sp, hl
ld h, 0 ; input blkdev
ld l, 1 ; output blkdev
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call USER_CODE
; signal the emulator we're done
halt
emulGetC:
in a, (STDIO_PORT)
or a ; cp 0
jr z, .eof
cp a ; ensure z
ret
.eof:
call unsetZ
ret
emulPutC:
out (STDIO_PORT), a
ret
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emulSeek:
out (STDIN_REWIND), a
ret
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#include "core.asm"
.equ BLOCKDEV_RAMSTART RAMSTART
.equ BLOCKDEV_COUNT 2
#include "blockdev.asm"
; List of devices
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.dw emulGetC, 0, emulSeek, 0
.dw 0, emulPutC, 0, 0