collapseos/recipes/sms/romasm/glue.asm
Virgil Dupras 2a55bfd375 stdio: remove a layer of indirection in GetC/PutC
We use zasm's ability to use labels in .equ directive.

We didn't do it before because for a while, we were in between scas
and zasm (scas was used in automated tests) so we needed to use the
lowest common denominator: zasm doesn't have macros and scas can't
use labels in .equ directives.

This forced us to add this layer of indirection. But now that we are
completely cut from scas' dependency, we can use this nice zasm's
ability.
2019-11-04 09:55:12 -05:00

166 lines
2.4 KiB
NASM

; 8K of onboard RAM
.equ RAMSTART 0xc000
.equ USER_RAMSTART 0xc200
; Memory register at the end of RAM. Must not overwrite
.equ RAMEND 0xddd0
jp init
; *** JUMP TABLE ***
jp strncmp
jp addDE
jp addHL
jp upcase
jp unsetZ
jp intoDE
jp intoHL
jp writeHLinDE
jp findchar
jp parseHex
jp parseHexPair
jp blkSel
jp blkSet
jp fsFindFN
jp fsOpen
jp fsGetB
jp fsPutB
jp fsSetSize
jp cpHLDE
jp parseArgs
jp printstr
jp _blkGetB
jp _blkPutB
jp _blkSeek
jp _blkTell
jp printcrlf
jp stdioPutC
jp stdioReadLine
.fill 0x66-$
retn
.inc "err.h"
.inc "core.asm"
.inc "parse.asm"
.inc "sms/kbd.asm"
.equ KBD_RAMSTART RAMSTART
.equ KBD_FETCHKC smskbdFetchKCB
.inc "kbd.asm"
.equ VDP_RAMSTART KBD_RAMEND
.inc "sms/vdp.asm"
.equ STDIO_RAMSTART VDP_RAMEND
.equ STDIO_GETC kbdGetC
.equ STDIO_PUTC vdpPutC
.inc "stdio.asm"
.equ MMAP_START 0xd700
; 0x180 is to leave some space for the stack
.equ MMAP_LEN RAMEND-MMAP_START-0x180
.inc "mmap.asm"
.equ BLOCKDEV_RAMSTART STDIO_RAMEND
.equ BLOCKDEV_COUNT 3
.inc "blockdev.asm"
; List of devices
.dw mmapGetB, mmapPutB
.dw f0GetB, f0PutB
.dw f1GetB, f1PutB
.equ FS_RAMSTART BLOCKDEV_RAMEND
.equ FS_HANDLE_COUNT 2
.inc "fs.asm"
.equ SHELL_RAMSTART FS_RAMEND
.equ SHELL_EXTRA_CMD_COUNT 10
.inc "shell.asm"
.dw edCmd, zasmCmd, fnewCmd, fdelCmd, fopnCmd, flsCmd, blkBselCmd
.dw blkSeekCmd, blkLoadCmd, blkSaveCmd
.inc "blockdev_cmds.asm"
.inc "fs_cmds.asm"
.equ PGM_RAMSTART SHELL_RAMEND
.equ PGM_CODEADDR USER_RAMSTART
.inc "pgm.asm"
.out PGM_RAMEND
init:
di
im 1
ld sp, RAMEND
; init a FS in mmap
ld hl, MMAP_START
ld a, 'C'
ld (hl), a
inc hl
ld a, 'F'
ld (hl), a
inc hl
ld a, 'S'
ld (hl), a
call fsInit
xor a
ld de, BLOCKDEV_SEL
call blkSel
call fsOn
call kbdInit
call vdpInit
call shellInit
ld hl, pgmShellHook
ld (SHELL_CMDHOOK), hl
jp shellLoop
f0GetB:
ld ix, FS_HANDLES
jp fsGetB
f0PutB:
ld ix, FS_HANDLES
jp fsPutB
f1GetB:
ld ix, FS_HANDLES+FS_HANDLE_SIZE
jp fsGetB
f1PutB:
ld ix, FS_HANDLES+FS_HANDLE_SIZE
jp fsPutB
edCmd:
.db "ed", 0, 0, 0b1001, 0, 0
push hl \ pop ix
ld l, (ix)
ld h, (ix+1)
jp 0x1900
zasmCmd:
.db "zasm", 0b1001, 0, 0
push hl \ pop ix
ld l, (ix)
ld h, (ix+1)
jp 0x1d00
; last time I checked, PC at this point was 0x183c. Let's give us a nice margin
; for the start of ed.
.fill 0x1900-$
.bin "ed.bin"
; Last check: 0x1c4e
.fill 0x1d00-$
.bin "zasm.bin"
.fill 0x7ff0-$
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c