From 1afc9d3fcaa7c5992659bb8b69f639b746dda2bc Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@nephron.lcs.mit.edu>
Date: Thu, 5 Aug 2010 21:16:55 -0400
Subject: add some comments find out the hard way why user and kernel must have
 separate segment descriptors

---
 asm.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'asm.h')

diff --git a/asm.h b/asm.h
index 0c052db..68210d7 100644
--- a/asm.h
+++ b/asm.h
@@ -6,6 +6,8 @@
         .word 0, 0;                                             \
         .byte 0, 0, 0, 0
 
+// The 0xC0 means the limit is in 4096-byte units
+// and (for executable segments) 32-bit mode.
 #define SEG_ASM(type,base,lim)                                  \
         .word (((lim) >> 12) & 0xffff), ((base) & 0xffff);      \
         .byte (((base) >> 16) & 0xff), (0x90 | (type)),         \
-- 
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