Use uppercase non-struct constants for BPB

kernel/fat.asm

@@ -1,60 +0,0 @@
-section .text
-
-load_bpb:	mov bx, [drive_ptr]
-		; read word for "sectors per fat"
-		mov ax, [diskbuf+0x016]
-		xor dx, dx
-		; if zero, we need to check dword in BPB 7.1
-		test ax, ax
-		jnz .short_sf
-		; fail if BPB 7.1 signature is not present
-		mov cl, [diskbuf+0x042]
-		or cl, 1
-		cmp cl, 0x29
-		jne .err
-		; load dword
-		mov ax, [diskbuf+0x024]
-		mov dx, [diskbuf+0x026]
-.short_sf:
-		; store local value
-		mov [bx+drive.fat_size], ax
-		mov [bx+drive.fat_size+2], dx
-
-		; copy number of fat's
-		xor ah, ah
-		mov al, [diskbuf+0x010]
-		mov [bx+drive.fat_num], ax
-
-		; copy number of root directory entries
-		mov ax, [diskbuf+0x011]
-		mov cl, 4
-		shr ax, cl
-		mov [bx+drive.dir_size], ax
-
-		; calculate offsets for everything
-		xor ax, ax
-		xor dx, dx
-		; add reserved sectors
-		add ax, [diskbuf+0x0B+bpb_rsc]
-		adc ax, 0
-		; save begin of FAT tables
-		mov [bx+drive.fat_offset], ax
-		mov [bx+drive.fat_offset+2], dx
-		; add FAT size * FAT number
-		mov cx, [bx+drive.fat_num]
-.floop:		add ax, [bx+drive.fat_size]
-		adc dx, [bx+drive.fat_size+2]
-		loop .floop
-		; save begin of root directories
-		mov [bx+drive.dir_offset], ax
-		mov [bx+drive.dir_offset+2], dx
-		; add root directory size (might be zero)
-		add ax, [bx+drive.dir_size]
-		adc dx, 0
-		; save start of data area
-		mov [bx+drive.clus_offset], ax
-		mov [bx+drive.clus_offset+2], dx
-
-		ret
-.err:		stc
-		ret