2019-05-10 04:09:40 +10:00
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; Glue code for the emulated environment
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2019-05-11 08:20:43 +10:00
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.equ RAMSTART 0x4000
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2019-05-20 05:03:34 +10:00
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.equ USER_CODE 0x4800
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2019-05-10 04:09:40 +10:00
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.equ STDIO_PORT 0x00
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2019-05-16 03:41:56 +10:00
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.equ STDIN_SEEK 0x01
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2019-05-17 03:23:23 +10:00
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.equ FS_DATA_PORT 0x02
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.equ FS_SEEK_PORT 0x03
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2019-05-18 03:22:45 +10:00
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.equ STDERR_PORT 0x04
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2019-05-10 04:09:40 +10:00
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2019-05-20 02:57:59 +10:00
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jp init ; 3 bytes
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; *** JUMP TABLE ***
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2019-06-01 01:12:29 +10:00
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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 intoHL
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jp writeHLinDE
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jp findchar
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jp parseHex
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jp parseHexPair
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jp blkSel
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2019-06-05 10:45:01 +10:00
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jp blkSet
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2019-06-01 01:12:29 +10:00
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jp fsFindFN
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jp fsOpen
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jp fsGetC
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jp cpHLDE
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2019-06-03 04:05:20 +10:00
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jp parseArgs
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2019-06-05 01:53:02 +10:00
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jp _blkGetC
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jp _blkPutC
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jp _blkSeek
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jp _blkTell
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2019-06-20 01:42:39 +10:00
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jp printstr
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2019-05-10 04:09:40 +10:00
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2019-10-07 05:32:23 +11:00
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.inc "core.asm"
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.inc "err.h"
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.inc "parse.asm"
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2019-05-17 03:23:23 +10:00
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.equ BLOCKDEV_RAMSTART RAMSTART
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.equ BLOCKDEV_COUNT 3
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2019-10-07 05:32:23 +11:00
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.inc "blockdev.asm"
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2019-05-17 03:23:23 +10:00
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; List of devices
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2019-06-05 01:53:02 +10:00
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.dw emulGetC, unsetZ
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.dw unsetZ, emulPutC
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.dw fsdevGetC, fsdevPutC
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2019-05-17 03:23:23 +10:00
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2019-06-20 01:42:39 +10:00
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
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2019-10-07 05:32:23 +11:00
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.inc "stdio.asm"
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2019-06-20 01:42:39 +10:00
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.equ FS_RAMSTART STDIO_RAMEND
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2019-05-17 03:23:23 +10:00
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.equ FS_HANDLE_COUNT 0
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2019-10-07 05:32:23 +11:00
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.inc "fs.asm"
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2019-05-17 03:23:23 +10:00
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2019-05-10 04:09:40 +10:00
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init:
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di
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2019-05-19 23:14:40 +10:00
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ld hl, 0xffff
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2019-05-10 04:09:40 +10:00
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ld sp, hl
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2019-06-20 01:42:39 +10:00
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ld hl, unsetZ
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ld de, stderrPutC
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call stdioInit
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2019-05-17 03:23:23 +10:00
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ld a, 2 ; select fsdev
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2019-06-04 23:56:36 +10:00
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ld de, BLOCKDEV_SEL
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2019-05-17 03:23:23 +10:00
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call blkSel
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call fsOn
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2019-06-03 04:05:20 +10:00
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ld hl, .zasmArgs
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2019-05-20 02:57:59 +10:00
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call USER_CODE
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2019-05-10 04:09:40 +10:00
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; signal the emulator we're done
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halt
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2019-06-03 04:05:20 +10:00
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.zasmArgs:
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2019-06-03 04:46:07 +10:00
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.db "0 1", 0
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2019-06-03 04:05:20 +10:00
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2019-05-18 03:22:45 +10:00
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; *** I/O ***
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2019-05-10 05:36:03 +10:00
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emulGetC:
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2019-06-05 01:53:02 +10:00
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; the STDIN_SEEK port works by poking it twice. First poke is for high
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; byte, second poke is for low one.
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ld a, h
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out (STDIN_SEEK), a
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ld a, l
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out (STDIN_SEEK), a
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2019-05-10 05:36:03 +10:00
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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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2019-06-16 06:48:30 +10:00
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cp a ; ensure Z
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2019-05-10 05:36:03 +10:00
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ret
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2019-06-20 01:42:39 +10:00
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stderrPutC:
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out (STDERR_PORT), a
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cp a ; ensure Z
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ret
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2019-06-05 01:53:02 +10:00
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fsdevGetC:
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ld a, e
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out (FS_SEEK_PORT), a
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2019-05-16 03:41:56 +10:00
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ld a, h
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2019-06-05 01:53:02 +10:00
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out (FS_SEEK_PORT), a
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2019-05-16 03:41:56 +10:00
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ld a, l
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2019-06-05 01:53:02 +10:00
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out (FS_SEEK_PORT), a
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in a, (FS_SEEK_PORT)
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or a
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ret nz
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2019-05-17 03:23:23 +10:00
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in a, (FS_DATA_PORT)
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cp a ; ensure Z
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ret
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fsdevPutC:
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push af
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2019-05-29 05:56:39 +10:00
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ld a, e
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out (FS_SEEK_PORT), a
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2019-05-17 03:23:23 +10:00
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ld a, h
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out (FS_SEEK_PORT), a
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2019-05-17 11:15:00 +10:00
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ld a, l
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out (FS_SEEK_PORT), a
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2019-05-17 03:23:23 +10:00
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in a, (FS_SEEK_PORT)
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2019-06-05 01:53:02 +10:00
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or a
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jr nz, .error
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2019-05-17 03:23:23 +10:00
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pop af
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2019-06-05 01:53:02 +10:00
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out (FS_DATA_PORT), a
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2019-06-16 06:48:30 +10:00
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cp a ; ensure Z
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2019-05-17 03:23:23 +10:00
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ret
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2019-06-05 01:53:02 +10:00
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.error:
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pop af
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jp unsetZ ; returns
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2019-05-17 03:23:23 +10:00
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