X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fuserprog%2Fexception.h;h=f83e615bb1e010c8723510a99abb01d714c0f275;hb=b908b46a39be7b0906db4e79d69bace755f6dee1;hp=f1a1537b99edbfa05b93d21afb3ba2d5f3623dc8;hpb=34a1a2cf11500505e74ae5796e88de0d8de00958;p=pintos-anon

diff --git a/src/userprog/exception.h b/src/userprog/exception.h
index f1a1537..f83e615 100644
--- a/src/userprog/exception.h
+++ b/src/userprog/exception.h
@@ -1,6 +1,11 @@
 #ifndef USERPROG_EXCEPTION_H
 #define USERPROG_EXCEPTION_H
 
+/* Page fault error code bits that describe the cause of the exception.  */
+#define PF_P 0x1    /* 0: not-present page. 1: access rights violation. */
+#define PF_W 0x2    /* 0: read, 1: write. */
+#define PF_U 0x4    /* 0: kernel, 1: user process. */
+
 void exception_init (void);
 void exception_print_stats (void);