Implement entrypoint and table for syscalls

boot/kernel.asm

@@ -14,7 +14,7 @@ init:		cli
 		mov ds, ax
 		mov es, ax
 		mov ss, ax
-		mov sp, ( stack+stacksize )
+		mov sp, ax
 
 		call printf
 %defstr VERSIONSTR VERSION
@@ -31,20 +31,25 @@ init:		cli
 
 		call logdrv
 
-		mov bx, testfcb
-		call open
-		push ax
-		call printf
-		db "AX=",2,0x0A,0x0D,0
+		mov word [0x21*4], int21
+		mov word [0x21*4+2], cs
+		mov word [curpsp], 0x1000
 
+		mov ah, 2
+		mov dl, 0x37
+		int 0x21
+
+restart:
 hlt:		hlt
 		jmp hlt
 
+%include	"kernel/bdos.asm"
 %include	"kernel/far.asm"
 %include	"kernel/fcb.asm"
 %include	"kernel/find.asm"
-%include        "kernel/drive.asm"
+%include	"kernel/drive.asm"
 %include	"kernel/printf.asm"
+%include	"kernel/char.asm"
 
 section .data
 
@@ -54,4 +59,5 @@ testfcb:	db 0
 
 section .bss
 
+		alignb 2
 stack:		resb stacksize