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From: Mikael Pettersson <mikpe@csd.uu.se>
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Date: Wed, 29 Jan 2003 16:39:25 +0100
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org, discuss@x86-64.org
Subject: Re: two x86_64 fixes for 2.4.21-pre3
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Andi Kleen writes:
 > > It looks as if %gs handling isn't quite right.
 > 
 > You are running vanilla 2.4.21pre3, right? 
 > 
 > I just noticed that my big update which has this all fixed went 
 > only in after pre3.

I got 2.4.21-pre4 which has your x86_64 updates. It works MUCH better.
Still some problems remain:

1. One unknown ioctl is logged from RH8.0 init:

ioctl32(iwconfig:185): Unknown cmd fd(3) cmd(00008b01){00} arg(ffffda90) on socket:[389]

2. gdb still seems broken. gdb ./sleep [where ./sleep is simply main() calling
   nanosleep(), but linked with -lpthread] hangs or loops and takes forever
   to respond to ^C.

3. bootsect.S still needs a patch to prevent 'bzdisk' kernels from
   disabling the FDC

/Mikael

--- linux-2.4.21-pre4/arch/x86_64/boot/bootsect.S.~1~	2002-11-30 17:12:24.000000000 +0100
+++ linux-2.4.21-pre4/arch/x86_64/boot/bootsect.S	2003-01-29 16:08:38.000000000 +0100
@@ -395,9 +395,15 @@
 # NOTE: Doesn't save %ax or %dx; do it yourself if you need to.
 
 kill_motor:
+#if 1
+	xorw	%ax, %ax		# reset FDC
+	xorb	%dl, %dl
+	int	$0x13
+#else
 	movw	$0x3f2, %dx
 	xorb	%al, %al
 	outb	%al, %dx
+#endif
 	ret
 
 sectors:	.word 0