From: Ben Pfaff <blp@cs.stanford.edu>
Date: Sat, 8 Apr 2006 00:23:31 +0000 (+0000)
Subject: Fix for Bochs 2.2.6.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53b0d95c490021039ac2b5b1b7a80d82cefb2709;p=pintos-anon

Fix for Bochs 2.2.6.
(I think this might actually be a bug in Bochs, though.)
---

diff --git a/src/threads/loader.S b/src/threads/loader.S
index 2d76763..987feb1 100644
--- a/src/threads/loader.S
+++ b/src/threads/loader.S
@@ -220,6 +220,17 @@ start:
 
 	movl $1, %ebx
 	movl $LOADER_KERN_BASE + LOADER_PHYS_BASE, %edi
+
+#### Disable interrupt delivery by IDE controller, because we will be
+#### polling for data.
+#### (If we don't do this, Bochs 2.2.6 will never deliver any IDE
+#### interrupt to us later after we reset the interrupt controller
+#### during boot, even if we also reset the IDE controller.)
+
+	movw $0x3f6, %dx
+	movb $0x02, %al
+	outb %al, %dx
+	
 read_sector:
 
 # Poll status register while controller busy.