patch-2.4.25 linux-2.4.25/arch/i386/boot/setup.S

• Lines: 35
• Date: 2004-02-18 05:36:30.000000000 -0800
• Orig file: linux-2.4.24/arch/i386/boot/setup.S
• Orig date: 2003-11-28 10:26:19.000000000 -0800

diff -urN linux-2.4.24/arch/i386/boot/setup.S linux-2.4.25/arch/i386/boot/setup.S
@@ -49,6 +49,8 @@
  * by Matt Domsch <Matt_Domsch@dell.com> October 2002
  * conformant to T13 Committee www.t13.org
  *   projects 1572D, 1484D, 1386D, 1226DT
+ * disk signature read by Matt Domsch <Matt_Domsch@dell.com>
+ *	and Andrew Wilks <Andrew_Wilks@dell.com> September 2003
  */
 
 #include <linux/config.h>
@@ -549,6 +551,25 @@
 #endif
 
 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
+# Read the first sector of device 80h and store the 4-byte signature
+	movl	$0xFFFFFFFF, %eax
+	movl	%eax, (DISK80_SIG_BUFFER)	# assume failure
+	movb	$READ_SECTORS, %ah
+	movb	$1, %al				# read 1 sector
+	movb	$0x80, %dl			# from device 80
+	movb	$0, %dh				# at head 0
+	movw	$1, %cx				# cylinder 0, sector 0
+	pushw	%es
+	pushw	%ds
+	popw	%es
+	movw	$EDDBUF, %bx
+	int	$0x13
+	jc	disk_sig_done
+	movl	(EDDBUF+MBR_SIG_OFFSET), %eax
+	movl	%eax, (DISK80_SIG_BUFFER)	# store success
+disk_sig_done:
+	popw	%es
+
 # Do the BIOS Enhanced Disk Drive calls
 # This consists of two calls:
 #    int 13h ah=41h "Check Extensions Present"