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https://github.com/hsoft/collapseos.git
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2a55bfd375
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.
166 lines
2.4 KiB
NASM
166 lines
2.4 KiB
NASM
; 8K of onboard RAM
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.equ RAMSTART 0xc000
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.equ USER_RAMSTART 0xc200
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; Memory register at the end of RAM. Must not overwrite
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.equ RAMEND 0xddd0
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jp init
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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 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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jp blkSet
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jp fsFindFN
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jp fsOpen
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jp fsGetB
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jp fsPutB
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jp fsSetSize
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jp cpHLDE
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jp parseArgs
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jp printstr
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jp _blkGetB
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jp _blkPutB
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jp _blkSeek
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jp _blkTell
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jp printcrlf
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jp stdioPutC
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jp stdioReadLine
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.fill 0x66-$
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retn
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.inc "err.h"
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.inc "core.asm"
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.inc "parse.asm"
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.inc "sms/kbd.asm"
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.equ KBD_RAMSTART RAMSTART
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.equ KBD_FETCHKC smskbdFetchKCB
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.inc "kbd.asm"
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.equ VDP_RAMSTART KBD_RAMEND
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.inc "sms/vdp.asm"
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.equ STDIO_RAMSTART VDP_RAMEND
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.equ STDIO_GETC kbdGetC
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.equ STDIO_PUTC vdpPutC
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.inc "stdio.asm"
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.equ MMAP_START 0xd700
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; 0x180 is to leave some space for the stack
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.equ MMAP_LEN RAMEND-MMAP_START-0x180
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.inc "mmap.asm"
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.equ BLOCKDEV_RAMSTART STDIO_RAMEND
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.equ BLOCKDEV_COUNT 3
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.inc "blockdev.asm"
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; List of devices
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.dw mmapGetB, mmapPutB
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.dw f0GetB, f0PutB
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.dw f1GetB, f1PutB
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.equ FS_RAMSTART BLOCKDEV_RAMEND
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.equ FS_HANDLE_COUNT 2
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.inc "fs.asm"
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.equ SHELL_RAMSTART FS_RAMEND
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.equ SHELL_EXTRA_CMD_COUNT 10
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.inc "shell.asm"
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.dw edCmd, zasmCmd, fnewCmd, fdelCmd, fopnCmd, flsCmd, blkBselCmd
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.dw blkSeekCmd, blkLoadCmd, blkSaveCmd
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.inc "blockdev_cmds.asm"
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.inc "fs_cmds.asm"
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.equ PGM_RAMSTART SHELL_RAMEND
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.equ PGM_CODEADDR USER_RAMSTART
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.inc "pgm.asm"
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.out PGM_RAMEND
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init:
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di
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im 1
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ld sp, RAMEND
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; init a FS in mmap
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ld hl, MMAP_START
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ld a, 'C'
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ld (hl), a
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inc hl
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ld a, 'F'
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ld (hl), a
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inc hl
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ld a, 'S'
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ld (hl), a
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call fsInit
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xor a
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ld de, BLOCKDEV_SEL
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call blkSel
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call fsOn
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call kbdInit
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call vdpInit
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call shellInit
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ld hl, pgmShellHook
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ld (SHELL_CMDHOOK), hl
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jp shellLoop
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f0GetB:
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ld ix, FS_HANDLES
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jp fsGetB
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f0PutB:
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ld ix, FS_HANDLES
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jp fsPutB
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f1GetB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsGetB
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f1PutB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsPutB
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edCmd:
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.db "ed", 0, 0, 0b1001, 0, 0
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push hl \ pop ix
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ld l, (ix)
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ld h, (ix+1)
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jp 0x1900
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zasmCmd:
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.db "zasm", 0b1001, 0, 0
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push hl \ pop ix
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ld l, (ix)
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ld h, (ix+1)
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jp 0x1d00
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; last time I checked, PC at this point was 0x183c. Let's give us a nice margin
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; for the start of ed.
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.fill 0x1900-$
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.bin "ed.bin"
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; Last check: 0x1c4e
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.fill 0x1d00-$
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.bin "zasm.bin"
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.fill 0x7ff0-$
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.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c
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