Author: jhb
Date: Tue Mar 6 20:45:13 2012
New Revision: 232623
URL: http://svn.freebsd.org/changeset/base/232623
Log:
Add a note to clarify why we create a relocated copy of boot1 in lower
memory.
Modified:
head/sys/boot/i386/boot2/boot1.S
Modified: head/sys/boot/i386/boot2/boot1.S
==============================================================================
--- head/sys/boot/i386/boot2/boot1.S Tue Mar 6 20:37:06 2012
(r232622)
+++ head/sys/boot/i386/boot2/boot1.S Tue Mar 6 20:45:13 2012
(r232623)
@@ -125,7 +125,10 @@ main: cld #
String ops inc
mov $start,%sp # stack
/*
* Relocate ourself to MEM_REL. Since %cx == 0, the inc %ch sets
- * %cx == 0x100.
+ * %cx == 0x100. Note that boot1 does not use this relocated copy
+ * of itself while loading boot2; however, BTX reclaims the memory
+ * used by boot1 during its initialization. As a result, boot2 uses
+ * xread from the relocated copy.
*/
mov %sp,%si # Source
mov $MEM_REL,%di # Destination
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