mirror of
https://github.com/hsoft/collapseos.git
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163 lines
2.5 KiB
NASM
163 lines
2.5 KiB
NASM
; named shell_.asm to avoid infinite include loop.
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.equ RAMSTART 0x4000
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; kernel ram is well under 0x100 bytes. We're giving us 0x200 bytes so that we
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; never worry about the stack.
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.equ KERNEL_RAMEND 0x4200
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.equ USERCODE KERNEL_RAMEND
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.equ STDIO_PORT 0x00
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.equ FS_DATA_PORT 0x01
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.equ FS_ADDR_PORT 0x02
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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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.inc "core.asm"
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.inc "err.h"
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.inc "ascii.h"
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.inc "parse.asm"
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.equ BLOCKDEV_RAMSTART RAMSTART
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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 fsdevGetB, fsdevPutB
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.dw stdoutGetB, stdoutPutB
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.dw stdinGetB, stdinPutB
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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 emulGetC
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.equ STDIO_PUTC emulPutC
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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 9
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.inc "shell.asm"
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.dw blkBselCmd, blkSeekCmd, blkLoadCmd, blkSaveCmd
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.dw fsOnCmd, flsCmd, fnewCmd, fdelCmd, fopnCmd
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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 USERCODE
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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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; setup stack
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ld hl, KERNEL_RAMEND
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ld sp, hl
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call fsInit
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ld a, 0 ; select fsdev
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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 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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emulGetC:
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; Blocks until a char is returned
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in a, (STDIO_PORT)
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cp a ; ensure Z
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ret
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emulPutC:
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out (STDIO_PORT), a
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ret
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fsdevGetB:
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ld a, e
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out (FS_ADDR_PORT), a
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ld a, h
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out (FS_ADDR_PORT), a
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ld a, l
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out (FS_ADDR_PORT), a
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in a, (FS_ADDR_PORT)
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or a
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ret nz
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in a, (FS_DATA_PORT)
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cp a ; ensure Z
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ret
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fsdevPutB:
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push af
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ld a, e
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out (FS_ADDR_PORT), a
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ld a, h
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out (FS_ADDR_PORT), a
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ld a, l
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out (FS_ADDR_PORT), a
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in a, (FS_ADDR_PORT)
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cp 2 ; only A > 1 means error
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jr nc, .error ; A >= 2
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pop af
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out (FS_DATA_PORT), a
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cp a ; ensure Z
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ret
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.error:
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pop af
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jp unsetZ ; returns
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.equ STDOUT_HANDLE FS_HANDLES
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stdoutGetB:
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ld ix, STDOUT_HANDLE
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jp fsGetB
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stdoutPutB:
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ld ix, STDOUT_HANDLE
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jp fsPutB
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.equ STDIN_HANDLE FS_HANDLES+FS_HANDLE_SIZE
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stdinGetB:
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ld ix, STDIN_HANDLE
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jp fsGetB
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stdinPutB:
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ld ix, STDIN_HANDLE
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jp fsPutB
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