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 <[email protected]>
zubinmehta · Feb 11, 2015 · 48fd6b7 · 48fd6b7
1 parent c565650
commit 48fd6b7
Showing 1 changed file with 4 additions and 0 deletions.
diff --git 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.