-/*
- * 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>
-#include "debug.h"
+#include "lib/debug.h"
#endif
#include "loader.h"
/* 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);
/* 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);
}
#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 */
-/*
- * The PG_USER bits are not used by the kernel and they are
- * not interpreted by the hardware. The kernel allows
- * user processes to set them arbitrarily.
- */
+/* 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) */
-
-
-/* Segment selectors. */
-#define SEL_NULL 0x00 /* Null selector. */
-#define SEL_KCSEG 0x08 /* Kernel code selector. */
-#define SEL_KDSEG 0x10 /* Kernel data selector. */
-#define SEL_UCSEG 0x1B /* User code selector. */
-#define SEL_UDSEG 0x23 /* User data selector. */
-#define SEL_TSS 0x28 /* Task-state segment. */
-#define SEL_CNT 6 /* Number of segments. */
-
-#ifndef __ASSEMBLER__
-struct tss
- {
- uint16_t back_link, :16;
- uint32_t esp0;
- uint16_t ss0, :16;
- uint32_t esp1;
- uint16_t ss1, :16;
- uint32_t esp2;
- uint16_t ss2, :16;
- uint32_t cr3;
- uint32_t eip;
- uint32_t eflags;
- uint32_t eax, ecx, edx, ebx;
- uint32_t esp, ebp, esi, edi;
- uint16_t es, :16;
- uint16_t cs, :16;
- uint16_t ss, :16;
- uint16_t ds, :16;
- uint16_t fs, :16;
- uint16_t gs, :16;
- uint16_t ldt, :16;
- uint16_t trace, bitmap;
- };
-
-enum seg_system
- {
- SYS_SYSTEM = 0, /* System segment. */
- SYS_CODE_DATA = 1 /* Code or data segment. */
- };
-
-enum seg_granularity
- {
- GRAN_BYTE = 0, /* Limit has 1-byte granularity. */
- GRAN_PAGE = 1 /* Limit has 4 kB granularity. */
- };
-
-enum seg_type
- {
- /* System segment types. */
- TYPE_TSS_16_A = 1, /* 16-bit TSS (available). */
- TYPE_LDT = 2, /* LDT. */
- TYPE_TSS_16_B = 3, /* 16-bit TSS (busy). */
- TYPE_CALL_16 = 4, /* 16-bit call gate. */
- TYPE_TASK = 5, /* Task gate. */
- TYPE_INT_16 = 6, /* 16-bit interrupt gate. */
- TYPE_TRAP_16 = 7, /* 16-bit trap gate. */
- TYPE_TSS_32_A = 9, /* 32-bit TSS (available). */
- TYPE_TSS_32_B = 11, /* 32-bit TSS (busy). */
- TYPE_CALL_32 = 12, /* 32-bit call gate. */
- TYPE_INT_32 = 14, /* 32-bit interrupt gate. */
- TYPE_TRAP_32 = 15, /* 32-bit trap gate. */
-
- /* Code/data segment types. */
- TYPE_CODE = 8, /* 1=Code segment, 0=data segment. */
- TYPE_ACCESSED = 1, /* Set if accessed. */
-
- /* Data segment types. */
- TYPE_EXPAND_DOWN = 4, /* 1=Expands up, 0=expands down. */
- TYPE_WRITABLE = 2, /* 1=Read/write, 0=read-only. */
-
- /* Code segment types. */
- TYPE_CONFORMING = 4, /* 1=Conforming, 0=nonconforming. */
- TYPE_READABLE = 2 /* 1=Exec/read, 0=exec-only. */
- };
-
-static inline uint64_t
-make_dtr_operand (uint16_t limit, void *base)
-{
- return limit | ((uint64_t) (uint32_t) base << 16);
-}
-#endif
-
-#endif /* !_MMU_H_ */
+#endif /* mmu.h */
projects / pintos-anon / blobdiff