FreeBSD/Linux Kernel Cross Reference
sys/sys/physmem.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
      * 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.
     *
     * 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 _SYS_PHYSMEM_H_
    #define _SYS_PHYSMEM_H_
    
    /*
     * Routines to help configure physical ram.
     *
     * Multiple regions of contiguous physical ram can be added (in any order).
     *
     * Multiple regions of physical ram that should be excluded from crash dumps, or
     * memory allocation, or both, can be added (in any order).
     *
     * After all early kernel init is done and it's time to configure all
     * remainining non-excluded physical ram for use by other parts of the kernel,
     * physmem_init_kernel_globals() processes the hardware regions and
     * exclusion regions to generate the global dump_avail and phys_avail arrays
     * that communicate physical ram configuration to other parts of the kernel.
     */
    
    #define EXFLAG_NODUMP   0x01
    #define EXFLAG_NOALLOC  0x02
    
    void physmem_hardware_region(uint64_t pa, uint64_t sz);
    void physmem_exclude_region(vm_paddr_t pa, vm_size_t sz, uint32_t flags);
    size_t physmem_avail(vm_paddr_t *avail, size_t maxavail);
    void physmem_init_kernel_globals(void);
    void physmem_print_tables(void);
    
    /*
     * Convenience routines for FDT.
     */
    
    #ifdef FDT
    
    #include <machine/ofw_machdep.h>
    
    static inline void
    physmem_hardware_regions(struct mem_region * mrptr, int mrcount)
    {
            while (mrcount--) {
                    physmem_hardware_region(mrptr->mr_start, mrptr->mr_size);
                    ++mrptr;
            }
    }
    
    static inline void
    physmem_exclude_regions(struct mem_region * mrptr, int mrcount,
        uint32_t exflags)
    {
            while (mrcount--) {
                    physmem_exclude_region(mrptr->mr_start, mrptr->mr_size,
                        exflags);
                    ++mrptr;
            }
    }
    
    #endif /* FDT */
    
    #endif /* !_SYS_PHYSMEM_H_ */

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