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

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
      * 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 REGENTS 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 REGENTS 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.
     *
     *      from: @(#)param.h       5.8 (Berkeley) 6/28/91
     * $FreeBSD: releng/11.0/sys/riscv/include/param.h 295972 2016-02-24 16:50:34Z br $
     */
    
    #ifndef _MACHINE_PARAM_H_
    #define _MACHINE_PARAM_H_
    
    /*
     * Machine dependent constants for RISC-V.
     */
    
    #include <machine/_align.h>
    
    #define STACKALIGNBYTES (16 - 1)
    #define STACKALIGN(p)   ((uint64_t)(p) & ~STACKALIGNBYTES)
    
    #ifndef MACHINE
    #define MACHINE         "riscv"
    #endif
    #ifndef MACHINE_ARCH
    #define MACHINE_ARCH    "riscv64"
    #endif
    
    #if defined(SMP) || defined(KLD_MODULE)
    #ifndef MAXCPU
    #define MAXCPU          16
    #endif
    #else
    #define MAXCPU          1
    #endif /* SMP || KLD_MODULE */
    
    #ifndef MAXMEMDOM
    #define MAXMEMDOM       1
    #endif
    
    #define ALIGNBYTES      _ALIGNBYTES
    #define ALIGN(p)        _ALIGN(p)
    /*
     * ALIGNED_POINTER is a boolean macro that checks whether an address
     * is valid to fetch data elements of type t from on this architecture.
     * This does not reflect the optimal alignment, just the possibility
     * (within reasonable limits).
     */
    #define ALIGNED_POINTER(p, t)   ((((u_long)(p)) & (sizeof(t) - 1)) == 0)
    
    /*
     * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
     * architecture.  It should be used with appropriate caution.
     */
    #define CACHE_LINE_SHIFT        6
    #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
    
    #define PAGE_SHIFT      12
    #define PAGE_SIZE       (1 << PAGE_SHIFT)       /* Page size */
    #define PAGE_MASK       (PAGE_SIZE - 1)
    
    #define MAXPAGESIZES    1               /* maximum number of supported page sizes */
    
    #ifndef KSTACK_PAGES
    #define KSTACK_PAGES    4       /* pages of kernel stack (with pcb) */
    #endif
    
    #define KSTACK_GUARD_PAGES      1       /* pages of kstack guard; 0 disables */
    #define PCPU_PAGES              1
    
    /*
     * Mach derived conversion macros
     */
    #define round_page(x)           (((unsigned long)(x) + PAGE_MASK) & ~PAGE_MASK)
    #define trunc_page(x)           ((unsigned long)(x) & ~PAGE_MASK)
    
   #define atop(x)                 ((unsigned long)(x) >> PAGE_SHIFT)
   #define ptoa(x)                 ((unsigned long)(x) << PAGE_SHIFT)
   
   #define riscv_btop(x)           ((unsigned long)(x) >> PAGE_SHIFT)
   #define riscv_ptob(x)           ((unsigned long)(x) << PAGE_SHIFT)
   
   #define pgtok(x)                ((unsigned long)(x) * (PAGE_SIZE / 1024))
   
   #endif /* !_MACHINE_PARAM_H_ */

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