126 lines
1.6 KiB
NASM
126 lines
1.6 KiB
NASM
CPU 8086
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ORG 0x500
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jmp start
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;Calls
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%include "BYTE2HEX.INC"
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%include "CMPSTR.INC"
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%include "PRINTNL.INC"
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%include "PRINTCH.INC"
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%include "PRINTSTR.INC"
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%include "PRINTLN.INC"
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%include "READCH.INC"
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%include "READSTR.INC"
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%include "READLN.INC"
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;Commands
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%include "ECHO.INC"
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;%include "FILEIFY.INC"
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%include "HELLO.INC"
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%include "HELP.INC"
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%include "KEYCODE.INC"
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start:
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;Set up the stack
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cli
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mov sp, stack
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add sp, 0x100
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sti
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;Get the terminal width
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mov ah, 0xf
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int 0x10
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mov [cpl], ah
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;Print a welcome message
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mov si, welcome
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call println
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loop:
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;Prompt for and read a command
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;Print a prompt
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mov si, prompt
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call printstr
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;Read a command
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mov di, buffer
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mov al, 0xff
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call readln
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;Identify and execute the command
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exec:
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;Check for no command
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cmp byte [buffer], 0x0
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je loop
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.echo:
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;Check
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mov si, buffer
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mov di, cmd.echo
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call cmpstr
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;jnc .fileify
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jnc .hello
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;Execute
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call echo
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jmp loop
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;.fileify:
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;;Check
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;mov si, buffer
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;mov di, cmd.fileify
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;call cmpstr
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;jnc .hello
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;;Execute
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;call fileify
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;jmp loop
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.hello:
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;Check
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mov si, buffer
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mov di, cmd.hello
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call cmpstr
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jnc .help
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;Execute
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call hello
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jmp loop
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.help:
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;Check
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mov si, buffer
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mov di, cmd.help
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call cmpstr
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jnc .keycode
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;Execute
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call help
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jmp loop
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.keycode:
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;Check
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mov si, buffer
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mov di, cmd.keycode
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call cmpstr
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jnc .error
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;Execute
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call keycode
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jmp loop
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.error:
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mov si, error
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call println
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jmp loop
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cpl db 0x0
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welcome db 0xd, 0xa, "Welcome to EttinOS!", 0xd, 0xa, 0x0
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prompt db "> ", 0x0
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cmd:
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.echo db "echo", 0x0
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.fileify db "fileify", 0x0
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.hello db "hello", 0x0
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.help db "help", 0x0
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.keycode db "keycode", 0x0
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error db "Unknown command", 0x0
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buffer times 0xff db 0x0
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stack:
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