nes-proj/drivers/cpu/x86/mm/paging.h

66 lines
2.5 KiB
C

/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CPU_X86_MM_PAGING_H_
#define CPU_X86_MM_PAGING_H_
#include <stdint.h>
/**
* Page table entry format for PAE mode page table. See Intel Combined Manual,
* Vol. 3, Section 4.4 for more details.
*/
typedef union pte {
struct {
uint64_t present : 1;
uint64_t writable : 1;
uint64_t user_accessible : 1;
uint64_t pwt : 1; /**< Specify write-through cache policy */
uint64_t pcd : 1; /**< Disable caching */
uint64_t accessed : 1;
uint64_t dirty : 1;
uint64_t : 5;
uint64_t addr : 51;
uint64_t exec_disable : 1;
};
uint64_t raw;
} pte_t;
#define ENTRIES_PER_PDPT 4
#define ENTRIES_PER_PAGE_TABLE 512
typedef pte_t pdpt_t[ENTRIES_PER_PDPT];
typedef pte_t page_table_t[ENTRIES_PER_PAGE_TABLE];
#define MIN_PAGE_SIZE_SHAMT 12
#define MIN_PAGE_SIZE (1 << MIN_PAGE_SIZE_SHAMT)
#endif /* CPU_X86_MM_PAGING_H_ */