Re: [PATCH] restore floppy boot image
From: Timothy Miller
Date: Thu Jul 01 2004 - 09:34:57 EST
Randy.Dunlap wrote:
On Wed, 30 Jun 2004 17:52:30 -0400 (EDT) Joshua wrote:
| Thanks for the time in reading the patch.
|
| Hmm. pop %ax after the jmp is a clear bug. Must have been a zero
| on the stack when I tested it. <g>
|
| For the clobbering of al just before kernel entry, that is badly arranged
| code although it doesn't matter (mov $0, %al turns out to be no-op).
No-op should be some form/variant of xchg %ax,%ax
(not mov to %al -- the latter needs to do something.)
He didn't mean it was a "nop". He meant that the operation had no
effect because moving zero to a register which already contains zero
accomplishes nothing.
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