92a04f4627
Needed if we want to compile the kernel and zasm from within a SD card. I didn't go straight for 32-bit because it was significantly more complex and 24-bit give us 16M. Enough to go on for a while...
135 lines
2.3 KiB
NASM
135 lines
2.3 KiB
NASM
; classic RC2014 setup (8K ROM + 32K RAM) and a stock Serial I/O module
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; The RAM module is selected on A15, so it has the range 0x8000-0xffff
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.equ RAMSTART 0x8000
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; kernel RAM usage, because of SDC, is a bit high and bring us almost to 0x9e00
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; We allocate at least 0x100 bytes for RAM, which is why we have this threshold.
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; for the stack.
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.equ RAMEND 0xa000
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.equ PGM_CODEADDR RAMEND
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.equ ACIA_CTL 0x80 ; Control and status. RS off.
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.equ ACIA_IO 0x81 ; Transmit. RS on.
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jp init ; 3 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 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 fsGetC
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jp cpHLDE ; approaching 0x38...
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; interrupt hook
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.fill 0x38-$
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jp aciaInt
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; *** Jump Table (cont.) ***
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jp parseArgs
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jp printstr
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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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jp printHexPair
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jp sdcGetC
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jp sdcPutC
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jp blkGetC
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#include "err.h"
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#include "core.asm"
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#include "parse.asm"
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.equ ACIA_RAMSTART RAMSTART
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#include "acia.asm"
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.equ BLOCKDEV_RAMSTART ACIA_RAMEND
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.equ BLOCKDEV_COUNT 4
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#include "blockdev.asm"
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; List of devices
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.dw sdcGetC, sdcPutC
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.dw blk1GetC, blk1PutC
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.dw blk2GetC, blk2PutC
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.dw mmapGetC, mmapPutC
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.equ MMAP_START 0xe000
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#include "mmap.asm"
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
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#include "stdio.asm"
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.equ FS_RAMSTART STDIO_RAMEND
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.equ FS_HANDLE_COUNT 2
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#include "fs.asm"
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.equ SHELL_RAMSTART FS_RAMEND
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.equ SHELL_EXTRA_CMD_COUNT 11
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#include "shell.asm"
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.dw sdcInitializeCmd, sdcFlushCmd
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.dw blkBselCmd, blkSeekCmd, blkLoadCmd, blkSaveCmd
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.dw fsOnCmd, flsCmd, fnewCmd, fdelCmd, fopnCmd
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#include "fs_cmds.asm"
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#include "blockdev_cmds.asm"
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.equ PGM_RAMSTART SHELL_RAMEND
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#include "pgm.asm"
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.equ SDC_RAMSTART PGM_RAMEND
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.equ SDC_PORT_CSHIGH 6
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.equ SDC_PORT_CSLOW 5
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.equ SDC_PORT_SPI 4
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#include "sdc.asm"
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.out SDC_RAMEND
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init:
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di
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; setup stack
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ld hl, RAMEND
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ld sp, hl
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im 1
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call aciaInit
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ld hl, aciaGetC
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ld de, aciaPutC
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call stdioInit
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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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xor a
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ld de, BLOCKDEV_SEL
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call blkSel
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ei
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jp shellLoop
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; *** blkdev 1: file handle 0 ***
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blk1GetC:
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ld ix, FS_HANDLES
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jp fsGetC
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blk1PutC:
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ld ix, FS_HANDLES
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jp fsPutC
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; *** blkdev 2: file handle 1 ***
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blk2GetC:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsGetC
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blk2PutC:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsPutC
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