text: /*
   * 
   * Copyright (c) 2016 Simon Schmidt
   * 
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   * 
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   * 
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  #pragma once
  #include <machine/types.h>
  #include <sys/physmem.h>
  #include <sys/kspinlock.h>
  
  /*
   * A page-allocation-Bitmap.
   */
  struct physmem_bmalloc {
  	struct physmem_range  pmb_range;
  	u_int32_t*            pmb_bitmap;
  	paddr_t               pmb_length;
  };
  
  struct physmem_bmaset {
  	struct physmem_bmalloc** pmb_maps;
  	u_int32_t                pmb_n_maps;
  	kspinlock_t              pmb_lock;
  };
  
  int vm_phys_alloc(struct physmem_bmaset* pmas,paddr_t *res);
  
  int vm_phys_free(struct physmem_bmaset* pmas,paddr_t page);
  
  /*
   * 'vm_phys_bm_bootinit()' initializes a physical memory allocator, without actually
   * allocating any page of memory. This function is called even before initializing
   * the paging subsystem.
   */
  int vm_phys_bm_bootinit(
  		struct physmem_range *rng,
  		u_intptr_t n_ranges,
  		u_intptr_t *Pi,
  		paddr_t *Pt,
  		struct physmem_bmaset** Pbma
  );
  
  