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34ee91a0d7
This will soon allow use to seek and tell on input, which is necessary for a second pass which is necessary for forward symbol references. This require making `blkSel` a bit more flexible. Rather than having one global selected blkdev, each app can select its own, in its own memory space.
50 lines
747 B
NASM
50 lines
747 B
NASM
; Glue code for the emulated environment
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.equ RAMSTART 0x4000
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.equ USER_CODE 0x4800
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.equ STDIO_PORT 0x00
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jr init ; 2 bytes
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; *** JUMP TABLE ***
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jp strncmp
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jp addDE
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jp addHL
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jp upcase
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jp unsetZ
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jp intoDE
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jp findchar
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jp parseHexPair
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jp blkSel
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init:
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di
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; We put the stack at the end of the kernel memory
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ld hl, USER_CODE-1
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ld sp, hl
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ld h, 0 ; input blkdev
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ld l, 1 ; output blkdev
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call USER_CODE
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; signal the emulator we're done
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halt
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emulGetC:
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in a, (STDIO_PORT)
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or a ; cp 0
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jr z, .eof
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cp a ; ensure z
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ret
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.eof:
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call unsetZ
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ret
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emulPutC:
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out (STDIO_PORT), a
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ret
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#include "core.asm"
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.equ BLOCKDEV_RAMSTART RAMSTART
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.equ BLOCKDEV_COUNT 2
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#include "blockdev.asm"
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; List of devices
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.dw emulGetC, 0, 0, 0
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.dw 0, emulPutC, 0, 0
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