Reorder fat32 bootsector to reduce number of calls/rets

boot/fat32.asm

@@ -198,26 +198,15 @@ l02e:
 
 	ret
 
+	; Load root directory
 loadr:	mov ax, 2
 	xor dx, dx
 	jmp load
 
-loadf:	call search
-	jne fserr
-	mov ax, [si+0x1A]
-	mov dx, [si+0x14]
-
-	; load cluster chain DX:AX to [dest]:0
-load:	mov bx, 0x07C0
-lloop:	call readc
-	call next
-	cmp word dx, 0x0FFF
-	jne lloop
-	ret
-
-	; Search for first entry with matching fsattr
-search:	mov si, (0x7C00-0x20)
-loop:	add si, 0x20
+	; Load file identified by fsattr
+	; Directory data is expected at 0x07C00
+loadf:	mov si, (0x7C00-0x20)
+sloop:	add si, 0x20
 	; check if entry is valid
 	mov al, [si]
 	; unallocated direntry
@@ -225,12 +214,21 @@ loop:	add si, 0x20
 	jz fserr
 	; deleted files
 	cmp al, 0xE2
-	je loop
+	je sloop
 	; check attr
 	mov al, [si+11]
 	and al, 0x5C
 	cmp al, ah
-	jne loop
+	jne sloop
+	mov ax, [si+0x1A]
+	mov dx, [si+0x14]
+
+	; Load cluster chain DX:AX to 0x07C00
+load:	mov bx, 0x07C0
+lloop:	call readc
+	call next
+	cmp word dx, 0x0FFF
+	jne lloop
 	ret
 
 main:	mov bp, bpb
@@ -257,12 +255,6 @@ noebio:	lea di, [bp-2]
 	; search for first system file
 	mov ah, 0x04
 	call loadf
-	; jump
-	xor ax, ax
-	xor cx, cx
-	xor dx, dx
-	xor bx, bx
-	xor di, di
 
 	; restore drive number
 	mov dl, [bp+bpb7_dn]