Implement file search in directory

boot/kernel.asm

@@ -35,13 +35,9 @@ relinit:	; print banner
 		push word [version+2]
 		call printf
 		db "RDOS ",2,2, 0x0A, 0x0D, 0
-
-		push dx
-		push ds
+		; initialize the disk i/o
 		call dinit
-		pop ds
-		pop dx
-
+		; init 21h vector
 		mov word [0x21*4], int21
 		mov word [0x21*4+2], cs
 		; set current PSP, directly after us
@@ -49,15 +45,19 @@ relinit:	; print banner
 		mov cl, 4
 		shr ax, cl
 		mov word [curpsp], ax
+		; also the DTA
+		mov bx, dta
+		call setdta
+		; set current drive to boot drive
+		mov al, dl
+		rol al, 1
+		rol al, 1
+		or dl, al
+		and dl, 3
+		call setdd
 
-		cmp dl, 0x80
-		jc .k
-		sub dl, (0x80-2)
-.k:		call setdd
-
-		mov dx, testfcb
-		mov ah, 0xF
-		int 0x21
+		mov bx, testfcb
+		call fndfst
 
 restart:
 hlt:		hlt
@@ -70,6 +70,10 @@ hlt:		hlt
 %include	"kernel/drive.asm"
 %include	"kernel/printf.asm"
 
+section .bss
+
+dta:		resb 128
+
 section .data
 
 testfcb:	db 0