Remove unneeded stuff.

diff --git a/src/threads/mmu.h b/src/threads/mmu.h
index a4f1b3618570f552edddb3d9c83deb66d5f5838a..4a32b7369681015dc984955610005d4c10476ad7 100644 (file)
--- a/src/threads/mmu.h
+++ b/src/threads/mmu.h
@@ -1,42 +1,5 @@
-/*
- * Copyright (C) 1997 Massachusetts Institute of Technology 
- *
- * This software is being provided by the copyright holders under the
- * following license. By obtaining, using and/or copying this software,
- * you agree that you have read, understood, and will comply with the
- * following terms and conditions:
- *
- * Permission to use, copy, modify, distribute, and sell this software
- * and its documentation for any purpose and without fee or royalty is
- * hereby granted, provided that the full text of this NOTICE appears on
- * ALL copies of the software and documentation or portions thereof,
- * including modifications, that you make.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE NO
- * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE,
- * BUT NOT LIMITATION, COPYRIGHT HOLDERS MAKE NO REPRESENTATIONS OR
- * WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR
- * THAT THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY
- * THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS. COPYRIGHT
- * HOLDERS WILL BEAR NO LIABILITY FOR ANY USE OF THIS SOFTWARE OR
- * DOCUMENTATION.
- *
- * The name and trademarks of copyright holders may NOT be used in
- * advertising or publicity pertaining to the software without specific,
- * written prior permission. Title to copyright in this software and any
- * associated documentation will at all times remain with copyright
- * holders. See the file AUTHORS which should have accompanied this software
- * for a list of all copyright holders.
- *
- * This file may be derived from previously copyrighted software. This
- * copyright applies only to those changes made by the copyright
- * holders listed in the AUTHORS file. The rest of this file is covered by
- * the copyright notices, if any, listed below.
- */
-
-
-#ifndef _MMU_H_
-#define _MMU_H_
+#ifndef HEADER_MMU_H
+#define HEADER_MMU_H 1
 
 #ifndef __ASSEMBLER__
 #include <stdint.h>
@@ -93,7 +56,7 @@ static inline void *pg_round_down (void *va) {
 /* Returns kernel virtual address at which physical address PADDR
    is mapped. */
 static inline void *
-ptov (uintptr_t paddr) 
+ptov (uintptr_t paddr)
 {
   ASSERT ((void *) paddr < PHYS_BASE);
 
@@ -103,7 +66,7 @@ ptov (uintptr_t paddr)
 /* Returns physical address at which kernel virtual address VADDR
    is mapped. */
 static inline uintptr_t
-vtop (void *vaddr) 
+vtop (void *vaddr)
 {
   ASSERT (vaddr >= PHYS_BASE);
 
@@ -111,35 +74,15 @@ vtop (void *vaddr)
 }
 #endif
 
-/* Page Table/Directory Entry flags
- *   these are defined by the hardware
- */
-#define PG_P 0x1               /* Present */
-#define PG_W 0x2               /* Writeable */
-#define PG_U 0x4               /* User */
-#define PG_A 0x20              /* Accessed */
-#define PG_D 0x40              /* Dirty */
+/* Page Directory Entry (PDE) and Page Table Entry (PTE) flags. */
+#define PG_P 0x1               /* 1=present, 0=not present. */
+#define PG_W 0x2               /* 1=read/write, 0=read-only. */
+#define PG_U 0x4               /* 1=user/kernel, 0=kernel only. */
+#define PG_A 0x20              /* 1=accessed, 0=not acccessed. */
+#define PG_D 0x40              /* 1=dirty, 0=not dirty. */
 
 /* EFLAGS Register. */
 #define FLAG_MBS  0x00000002    /* Must be set. */
 #define FLAG_IF   0x00000200    /* Interrupt Flag. */
 
-/* Page fault error codes */
-#define FEC_PR 0x1             /* Page fault caused by protection violation */
-#define FEC_WR 0x2             /* Page fault caused by a write */
-#define FEC_U  0x4             /* Page fault occured while in user mode */
-
-
-/* Application segment type bits */
-#define STA_X 0x8              /* Executable segment */
-#define STA_A 0x1              /* Accessed */
-
-#define STA_C 0x4              /* Conforming code segment (executable only) */
-#define STA_R 0x2              /* Readable (executable segments) */
-
-#define STA_E 0x4              /* Expand down (non-executable segments) */
-#define STA_W 0x2              /* Writeable (non-executable segments) */
-
-
-
-#endif /* !_MMU_H_ */
+#endif /* mmu.h */