X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Floader.S;h=b7842d3840743c6f25ab0bceaafcbd97e74e65fd;hb=03f3426d4da28916900a7b811e72b862c5411d0d;hp=987feb1ad1ced9742500198ab77f3f44b4553041;hpb=53b0d95c490021039ac2b5b1b7a80d82cefb2709;p=pintos-anon

diff --git a/src/threads/loader.S b/src/threads/loader.S
index 987feb1..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
@@ -221,11 +223,11 @@ 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.)
+# 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