mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-21 00:28:05 +11:00
148 lines
2.5 KiB
NASM
148 lines
2.5 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 RAMEND last check: 0x9933
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; We allocate at least 0x100 bytes for the stack, which is why we have this
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; threshold.
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.equ RAMEND 0x9b00
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.equ USER_CODE RAMEND ; in sync with user.h
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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 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 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 sdcGetB
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jp sdcPutB
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jp blkGetB
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jp stdioPutC
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; interrupt hook
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.fill 0x38-$
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jp aciaInt
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.inc "err.h"
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.inc "ascii.h"
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.inc "blkdev.h"
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.inc "fs.h"
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.inc "core.asm"
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.inc "str.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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; *** BASIC ***
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; RAM space used in different routines for short term processing.
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.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
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.equ SCRATCHPAD FS_RAMEND
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.inc "lib/util.asm"
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.inc "lib/ari.asm"
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.inc "lib/parse.asm"
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.inc "lib/fmt.asm"
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.equ EXPR_PARSE parseLiteralOrVar
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.inc "lib/expr.asm"
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.inc "basic/util.asm"
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.inc "basic/parse.asm"
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.inc "basic/tok.asm"
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.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
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.inc "basic/var.asm"
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.equ BUF_RAMSTART VAR_RAMEND
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.inc "basic/buf.asm"
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.inc "basic/blk.asm"
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.inc "basic/sdc.asm"
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.equ BFS_RAMSTART BUF_RAMEND
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.inc "basic/fs.asm"
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.equ BAS_RAMSTART BFS_RAMEND
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.inc "basic/main.asm"
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.equ SDC_RAMSTART BAS_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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ld sp, RAMEND
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im 1
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call aciaInit
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call fsInit
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call basInit
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ld hl, basFindCmdExtra
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ld (BAS_FINDHOOK), 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 basStart
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basFindCmdExtra:
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ld hl, basFSCmds
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call basFindCmd
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ret z
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ld hl, basBLKCmds
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call basFindCmd
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ret z
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ld hl, basSDCCmds
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call basFindCmd
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ret z
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jp basPgmHook
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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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