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

     /*-
      * Copyright (c) 2014 Andrew Turner
      * Copyright (c) 2015-2018 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, SV48 only */
    #define L0_SHIFT        39
    #define L0_SIZE         (1UL << L0_SHIFT)
    #define L0_OFFSET       (L0_SIZE - 1)
    
    /* Level 1 table, 1GiB per entry */
    #define L1_SHIFT        30
    #define L1_SIZE         (1UL << L1_SHIFT)
    #define L1_OFFSET       (L1_SIZE - 1)
    
    /* Level 2 table, 2MiB per entry */
    #define L2_SHIFT        21
    #define L2_SIZE         (1UL << L2_SHIFT)
    #define L2_OFFSET       (L2_SIZE - 1)
    
    /* Level 3 table, 4KiB per entry */
    #define L3_SHIFT        12
    #define L3_SIZE         (1UL << L3_SHIFT)
    #define L3_OFFSET       (L3_SIZE - 1)
    
    #define Ln_ENTRIES_SHIFT 9
    #define Ln_ENTRIES      (1 << Ln_ENTRIES_SHIFT)
    #define Ln_ADDR_MASK    (Ln_ENTRIES - 1)
    
    /* Bits 9:8 are reserved for software */
    #define PTE_SW_MANAGED  (1 << 9)
    #define PTE_SW_WIRED    (1 << 8)
    #define PTE_D           (1 << 7) /* Dirty */
    #define PTE_A           (1 << 6) /* Accessed */
    #define PTE_G           (1 << 5) /* Global */
    #define PTE_U           (1 << 4) /* User */
    #define PTE_X           (1 << 3) /* Execute */
    #define PTE_W           (1 << 2) /* Write */
    #define PTE_R           (1 << 1) /* Read */
    #define PTE_V           (1 << 0) /* Valid */
    #define PTE_RWX         (PTE_R | PTE_W | PTE_X)
    #define PTE_RX          (PTE_R | PTE_X)
    #define PTE_KERN        (PTE_V | PTE_R | PTE_W | PTE_A | PTE_D)
    #define PTE_PROMOTE     (PTE_V | PTE_RWX | PTE_D | PTE_A | PTE_G | PTE_U | \
                             PTE_SW_MANAGED | PTE_SW_WIRED)
    
    /* Bits 63 - 54 are reserved for future use. */
    #define PTE_HI_MASK     0xFFC0000000000000ULL
    
    #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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