mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-27 23:28:05 +11:00
ae028e3a86
This huge refactoring remove the Seek and Tell routine from blockdev implementation requirements and change GetC and PutC's API so that they take an address to read and write (through HL/DE) at each call. The "PTR" approach in blockdev implementation was very redundant from device to device and it made more sense to generalize. It's possible that future device aren't "random access", but we'll be able to add more device types later. Another important change in this commit is that the "blockdev handle" is now opaque. Previously, consumers of the API would happily call routines directly from one of the 4 offsets. We can't do that any more. This makes the API more solid for future improvements. This change forced me to change a lot of things in fs, but overall, things are now simpler. No more `FS_PTR`: the "device handle" now holds the active pointer. Lots, lots of changes, but it also feels a lot cleaner and solid.
120 lines
2.0 KiB
NASM
120 lines
2.0 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 is under 0x300 bytes. We give ourselves at least 0x300 bytes
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; for the stack.
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.equ RAMEND 0x8600
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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 fsFindFN
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jp fsOpen
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jp fsGetC
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jp fsSeek
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jp fsTell ; 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 cpHLDE
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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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#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 3
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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 mmapGetC, mmapPutC
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.dw blk2GetC, blk2PutC
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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 1
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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 2: file handle 0 ***
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blk2GetC:
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ld ix, FS_HANDLES
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jp fsGetC
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blk2PutC:
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ld ix, FS_HANDLES
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jp fsPutC
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