X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Floader.S;h=b7842d3840743c6f25ab0bceaafcbd97e74e65fd;hb=8d5f8c112280d6e9eee7da93326ff64b72145963;hp=2d76763cffc3dcdc2aa339404bfb674360e22ae1;hpb=8abbb333aea445641d967befd3ca477502ea770b;p=pintos-anon

diff --git a/src/threads/loader.S b/src/threads/loader.S
index 2d76763..b7842d3 100644
--- a/src/threads/loader.S
+++ b/src/threads/loader.S
@@ -56,14 +56,16 @@
 #define CR0_PG 0x80000000      /* Paging. */
 #define CR0_WP 0x00010000      /* Write-Protect enable in kernel mode. */
 
-# Code runs in real mode, which is a 16-bit segment.
 
 .globl start
 start:
+	
+# Code runs in real mode, which is a 16-bit segment.
 	.code16
 
-# Disable interrupts.
-# String instructions go upward.
+# Disable interrupts, because we will not be prepared to handle them
+# in protected mode until much later.
+# String instructions go upward (e.g. for "rep stosl" below).
 
 	cli
 	cld
@@ -220,6 +222,17 @@ 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.