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7cf3ed38da
Most of register fiddling routines (which is now the only thing contained in care.asm) are used by almost all userspace apps, often in inner loops. That makes the penalty of using jump tables for those a bit too high. Moreover, it burdens jump tables needlessly. Because this unit is very small (now that string routines are out), it makes sense to always include it in binaries.
130 lines
2.2 KiB
NASM
130 lines
2.2 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 0x8500
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; We allocate at least 0x200 bytes for the stack, which is why we have this
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; threshold.
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.equ RAMEND 0x8700
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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 upcase
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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 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 printHexPair ; 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 sdcGetB
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jp sdcPutB
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jp blkGetB
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.inc "err.h"
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.inc "ascii.h"
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.inc "core.asm"
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.inc "str.asm"
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.inc "parse.asm"
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.equ ACIA_RAMSTART RAMSTART
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.inc "acia.asm"
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.equ BLOCKDEV_RAMSTART ACIA_RAMEND
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.equ BLOCKDEV_COUNT 4
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.inc "blockdev.asm"
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; List of devices
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.dw sdcGetB, sdcPutB
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.dw blk1GetB, blk1PutB
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.dw blk2GetB, blk2PutB
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.dw mmapGetB, mmapPutB
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.equ MMAP_START 0xe000
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.inc "mmap.asm"
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
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.equ STDIO_GETC aciaGetC
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.equ STDIO_PUTC aciaPutC
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.inc "stdio.asm"
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.equ FS_RAMSTART STDIO_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 11
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.inc "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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.inc "fs_cmds.asm"
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.inc "blockdev_cmds.asm"
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.equ PGM_RAMSTART SHELL_RAMEND
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.inc "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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.inc "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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call fsInit
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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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blk1GetB:
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ld ix, FS_HANDLES
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jp fsGetB
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blk1PutB:
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ld ix, FS_HANDLES
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jp fsPutB
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; *** blkdev 2: file handle 1 ***
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blk2GetB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsGetB
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blk2PutB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsPutB
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