From: Rusty Russell <rusty@rustcorp.com.au>
Date: Wed, 11 Feb 2015 04:45:10 +0000 (+1030)
Subject: lguest: suppress PS/2 keyboard polling.
X-Git-Tag: firefly_0821_release~176^2~2282^2~40
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=48fd6b71d60ef66ef2d791045d750168c0d09201;p=firefly-linux-kernel-4.4.55.git

lguest: suppress PS/2 keyboard polling.

While hacking on getting I/O out to the lguest launcher, I noticed
that returning 0xFF for the PS/2 keyboard status made it spin for a
while thinking there was a key pending.  Fix this by returning 1
instead of 0xFF.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---

diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c
index b2217657f62c..485fe13db12e 100644
--- a/tools/lguest/lguest.c
+++ b/tools/lguest/lguest.c
@@ -1259,6 +1259,10 @@ static void emulate_insn(const u8 insn[])
 	else
 		mask = 0xFFFFFFFF;
 
+	/* This is the PS/2 keyboard status; 1 means ready for output */
+	if (port == 0x64)
+		val = 1;
+
 	/*
 	 * If it was an "IN" instruction, they expect the result to be read
 	 * into %eax, so we change %eax.