FreeBSD/Linux Kernel Cross Reference
sys/riscv/include/pte.h

     /*-
      * Copyright (c) 2014 Andrew Turner
      * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * Portions of this software were developed by SRI International and the
      * University of Cambridge Computer Laboratory under DARPA/AFRL contract
      * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
      *
     * Portions of this software were developed by the University of Cambridge
     * Computer Laboratory as part of the CTSRD Project, with support from the
     * UK Higher Education Innovation Fund (HEIF).
     *
     * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_PTE_H_
    #define _MACHINE_PTE_H_
    
    #ifndef LOCORE
    typedef uint64_t        pd_entry_t;             /* page directory entry */
    typedef uint64_t        pt_entry_t;             /* page table entry */
    typedef uint64_t        pn_t;                   /* page number */
    #endif
    
    /* Level 0 table, 512GiB per entry */
    #define L0_SHIFT        39
    
    /* Level 1 table, 1GiB per entry */
    #define L1_SHIFT        30
    #define L1_SIZE         (1 << L1_SHIFT)
    #define L1_OFFSET       (L1_SIZE - 1)
    
    /* Level 2 table, 2MiB per entry */
    #define L2_SHIFT        21
    #define L2_SIZE         (1 << L2_SHIFT)
    #define L2_OFFSET       (L2_SIZE - 1)
    
    /* Level 3 table, 4KiB per entry */
    #define L3_SHIFT        12
    #define L3_SIZE         (1 << L3_SHIFT)
    #define L3_OFFSET       (L3_SIZE - 1)
    
    #define Ln_ENTRIES      (1 << 9)
    #define Ln_ADDR_MASK    (Ln_ENTRIES - 1)
    
    /* Bits 9:7 are reserved for software */
    #define PTE_SW_MANAGED  (1 << 8)
    #define PTE_SW_WIRED    (1 << 7)
    #define PTE_DIRTY       (1 << 6) /* Virtual page is written */
    #define PTE_REF         (1 << 5) /* Virtual page is referenced */
    #define PTE_VALID       (1 << 0) /* Virtual page is valid */
    #define PTE_TYPE_S      1
    #define PTE_TYPE_M      (0xf << PTE_TYPE_S)
    #define PTE_TYPE_PTR    0
    #define PTE_TYPE_PTR_G  1
    #define PTE_TYPE_SROURX 2       /* Supervisor read-only, user read-execute page. */
    #define PTE_TYPE_SRWURWX 3      /* Supervisor read-write, user read-write-execute page. */
    #define PTE_TYPE_SURO   4       /* Supervisor and user read-only page. */
    #define PTE_TYPE_SURW   5       /* Supervisor and user read-write page. */
    #define PTE_TYPE_SURX   6       /* Supervisor and user read-execute page. */
    #define PTE_TYPE_SURWX  7       /* Supervisor and User Read Write Execute */
    #define PTE_TYPE_SRO    8       /* Supervisor read-only page. */
    #define PTE_TYPE_SRW    9       /* Supervisor read-write page. */
    #define PTE_TYPE_SRX    10      /* Supervisor read-execute page. */
    #define PTE_TYPE_SRWX   11      /* Supervisor read-write-execute page. */
    #define PTE_TYPE_SRO_G  12      /* Supervisor read-only page--global mapping. */
    #define PTE_TYPE_SRW_G  13      /* Supervisor read-write page--global mapping. */
    #define PTE_TYPE_SRX_G  14      /* Supervisor read-execute page--global mapping. */
    #define PTE_TYPE_SRWX_G 15      /* Supervisor Read Write Execute Global */
    
    #define PTE_PPN0_S      10
    #define PTE_PPN1_S      19
    #define PTE_PPN2_S      28
    #define PTE_PPN3_S      37
    #define PTE_SIZE        8
    
    #endif /* !_MACHINE_PTE_H_ */
   
   /* End of pte.h */

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