From c89cafc9e4b08e62f6794425295a99f385d0a47b Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 11 Jul 2007 16:14:07 -0700
Subject: [PATCH] Add some comments to the MBR

---
 mbr/mbr.S | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mbr/mbr.S b/mbr/mbr.S
index ecab4e9..854e39b 100644
--- a/mbr/mbr.S
+++ b/mbr/mbr.S
@@ -218,7 +218,7 @@ scan_partition_table:
 	call	scan_partition_table
 11:
 	/* This returned, so we need to reload the current partition table */
-	movl	28(%bp), %eax
+	movl	28(%bp), %eax		/* "Base" */
 	call	read_partition_table
 
 	/* fall through */
@@ -238,10 +238,10 @@ scan_partition_table:
 boot:
 	movl	8(%si), %eax
 	addl	28(%bp), %eax
-	movl	%eax, 8(%si)
+	movl	%eax, 8(%si)	/* Adjust in-memory partition table entry */
 	pushw	%si
 	call	read_sector
-	popw	%si
+	popw	%si		/* ds:si -> partition table entry */
 	jc	disk_error
 	cmpw	$0xaa55, (bootsec+510)
 	jne	missing_os		/* Not a valid boot sector */
-- 
2.7.4