142 lines
2.1 KiB
NASM
142 lines
2.1 KiB
NASM
; named shell_.asm to avoid infinite include loop.
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.equ RAMSTART 0x4000
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.equ KERNEL_RAMEND 0x5000
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.equ USERCODE 0x9000
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.equ STDIO_PORT 0x00
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.equ FS_DATA_PORT 0x01
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.equ FS_SEEKL_PORT 0x02
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.equ FS_SEEKH_PORT 0x03
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.equ FS_SEEKE_PORT 0x04
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jp init
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; *** JUMP TABLE ***
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jp printstr
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#include "core.asm"
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#include "err.h"
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#include "parse.asm"
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.equ BLOCKDEV_RAMSTART RAMSTART
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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 fsdevGetC, fsdevPutC, fsdevSeek, fsdevTell
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.dw stdoutGetC, stdoutPutC, stdoutSeek, stdoutTell
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.dw stdinGetC, stdinPutC, stdinSeek, stdinTell
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#include "blockdev_cmds.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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#include "fs_cmds.asm"
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.equ SHELL_RAMSTART FS_RAMEND
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.equ SHELL_EXTRA_CMD_COUNT 9
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#include "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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.equ PGM_CODEADDR USERCODE
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#include "pgm.asm"
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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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ld hl, emulGetC
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ld de, emulPutC
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call stdioInit
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call fsInit
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ld a, 0 ; select fsdev
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ld de, BLOCKDEV_GETC
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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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fsdevGetC:
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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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fsdevPutC:
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out (FS_DATA_PORT), a
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ret
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fsdevSeek:
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push af
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ld a, l
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out (FS_SEEKL_PORT), a
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ld a, h
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out (FS_SEEKH_PORT), a
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ld a, e
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out (FS_SEEKE_PORT), a
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pop af
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ret
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fsdevTell:
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push af
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in a, (FS_SEEKL_PORT)
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ld l, a
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in a, (FS_SEEKH_PORT)
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ld h, a
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in a, (FS_SEEKE_PORT)
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ld e, a
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pop af
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ret
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.equ STDOUT_HANDLE FS_HANDLES
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stdoutGetC:
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ld ix, STDOUT_HANDLE
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jp fsGetC
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stdoutPutC:
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ld ix, STDOUT_HANDLE
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jp fsPutC
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stdoutSeek:
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ld ix, STDOUT_HANDLE
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jp fsSeek
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stdoutTell:
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ld ix, STDOUT_HANDLE
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jp fsTell
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.equ STDIN_HANDLE FS_HANDLES+FS_HANDLE_SIZE
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stdinGetC:
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ld ix, STDIN_HANDLE
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jp fsGetC
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stdinPutC:
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ld ix, STDIN_HANDLE
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jp fsPutC
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stdinSeek:
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ld ix, STDIN_HANDLE
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jp fsSeek
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stdinTell:
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ld ix, STDIN_HANDLE
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jp fsTell
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