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recipes/sms/romasm: first steps

This commit is contained in:
Virgil Dupras 2019-07-21 15:37:03 -04:00
parent 421d881fae
commit 70a42e8c4d
5 changed files with 222 additions and 0 deletions

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recipes/sms/romasm/.gitignore vendored Normal file
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user.h

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ZASM = ../../../tools/zasm.sh
KERNEL = ../../../kernel
APPS = ../../../apps
.PHONY: all
all: os.sms ed.bin
ed.bin: $(APPS)/ed/glue.asm
echo ".equ USER_CODE ED_CODE" | cat user-tmpl.h - > user.h
$(ZASM) $(KERNEL) $(APPS) user.h < $< > $@
zasm.bin: $(APPS)/zasm/glue.asm
echo ".equ USER_CODE ZASM_CODE" | cat user-tmpl.h - > user.h
$(ZASM) $(KERNEL) $(APPS) user.h < $< > $@
os.sms: glue.asm ed.bin zasm.bin
$(ZASM) $(KERNEL) ed.bin zasm.bin < $< > $@

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# zasm and ed from ROM
SMS' RAM is much tighter than in the RC2014, which makes the idea of loading
apps like zasm and ed in memory before using it a bit wasteful. In this recipe,
we'll include zasm and ed code directly in the kernel and expose them as shell
commands.
Moreover, we'll carve ourselves a little 1K memory map to put a filesystem in
there. This will give us a nice little system that can edit small source files
compile them and run them.
## Gathering parts
* A SMS that can run Collapse OS.
* A [PS/2 keyboard adapter](../kbd/README.md)

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recipes/sms/romasm/glue.asm Normal file
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; 8K of onboard RAM
.equ RAMSTART 0xc000
; 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 fsGetC
jp fsPutC
jp fsSetSize
jp cpHLDE
jp parseArgs
jp printstr
jp _blkGetC
jp _blkPutC
jp _blkSeek
jp _blkTell
jp printcrlf
jp stdioPutC
jp stdioReadLine
.fill 0x66-$
retn
#include "err.h"
#include "core.asm"
#include "parse.asm"
#include "sms/kbd.asm"
.equ KBD_RAMSTART RAMSTART
.equ KBD_FETCHKC smskbdFetchKCB
#include "kbd.asm"
.equ VDP_RAMSTART KBD_RAMEND
#include "sms/vdp.asm"
.equ STDIO_RAMSTART VDP_RAMEND
#include "stdio.asm"
.equ MMAP_START 0xd800
#include "mmap.asm"
.equ BLOCKDEV_RAMSTART STDIO_RAMEND
.equ BLOCKDEV_COUNT 3
#include "blockdev.asm"
; List of devices
.dw mmapGetC, mmapPutC
.dw f0GetC, f0PutC
.dw f1GetC, f1PutC
#include "blockdev_cmds.asm"
.equ FS_RAMSTART BLOCKDEV_RAMEND
.equ FS_HANDLE_COUNT 2
#include "fs.asm"
#include "fs_cmds.asm"
.equ SHELL_RAMSTART FS_RAMEND
.equ SHELL_EXTRA_CMD_COUNT 11
#include "shell.asm"
.dw edCmd, zasmCmd, fnewCmd, fdelCmd, fopnCmd, flsCmd, fsOnCmd, blkBselCmd
.dw blkSeekCmd, blkLoadCmd, blkSaveCmd
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
call blkSel
call kbdInit
call vdpInit
ld hl, kbdGetC
ld de, vdpPutC
call stdioInit
call shellInit
jp shellLoop
f0GetC:
ld ix, FS_HANDLES
jp fsGetC
f0PutC:
ld ix, FS_HANDLES
jp fsPutC
f1GetC:
ld ix, FS_HANDLES+FS_HANDLE_SIZE
jp fsGetC
f1PutC:
ld ix, FS_HANDLES+FS_HANDLE_SIZE
jp fsPutC
edCmd:
.db "eded", 0b1001, 0, 0
push hl \ pop ix
ld l, (ix)
ld h, (ix+1)
jp 0x1800
zasmCmd:
.db "zasm", 0b1001, 0, 0
push hl \ pop ix
ld l, (ix)
ld h, (ix+1)
jp 0x1c00
; last time I checked, PC at this point was 0x175a. Let's give us a nice margin
; for the start of ed.
.fill 0x1800-$
.bin "ed.bin"
; Last check: 0x1b4e
.fill 0x1c00-$
.bin "zasm.bin"
.fill 0x7ff0-$
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c

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; USER_CODE is filled in on-the-fly with either ED_CODE or ZASM_CODE
.equ ED_CODE 0x1800
.equ ZASM_CODE 0x1c00
.equ USER_RAMSTART 0xc200
.equ FS_HANDLE_SIZE 6
.equ BLOCKDEV_SIZE 8
; *** JUMP TABLE ***
.equ strncmp 0x03
.equ addDE 0x06
.equ addHL 0x09
.equ upcase 0x0c
.equ unsetZ 0x0f
.equ intoDE 0x12
.equ intoHL 0x15
.equ writeHLinDE 0x18
.equ findchar 0x1b
.equ parseHex 0x1e
.equ parseHexPair 0x21
.equ blkSel 0x24
.equ blkSet 0x27
.equ fsFindFN 0x2a
.equ fsOpen 0x2d
.equ fsGetC 0x30
.equ fsPutC 0x33
.equ fsSetSize 0x36
.equ cpHLDE 0x39
.equ parseArgs 0x3c
.equ printstr 0x3f
.equ _blkGetC 0x42
.equ _blkPutC 0x45
.equ _blkSeek 0x48
.equ _blkTell 0x4b
.equ printcrlf 0x4e
.equ stdioPutC 0x51
.equ stdioReadLine 0x54