/* vm.c: VIRTUAL MEMORY IMPLEMENTATION
 *
 * $Id: //info.ravenbrook.com/project/mps/master/code/vm.c#4 $
 * Copyright (c) 2014-2020 Ravenbrook Limited.  See end of file for license.
 *
 * This is the portable part of the virtual memory implementation.
 */

#include "mpm.h"
#include "vm.h"

SRCID(vm, "$Id: //info.ravenbrook.com/project/mps/master/code/vm.c#4 $");


/* VMCheck -- check a VM structure */

Bool VMCheck(VM vm)
{
  CHECKS(VM, vm);
  CHECKL(vm->base != (Addr)0);
  CHECKL(vm->limit != (Addr)0);
  CHECKL(vm->base < vm->limit);
  CHECKL(ArenaGrainSizeCheck(vm->pageSize));
  CHECKL(AddrIsAligned(vm->base, vm->pageSize));
  CHECKL(AddrIsAligned(vm->limit, vm->pageSize));
  CHECKL(vm->block != NULL);
  CHECKL((Addr)vm->block <= vm->base);
  CHECKL(vm->mapped <= vm->reserved);
  return TRUE;
}


/* VMPageSize -- return the page size cached in the VM */

Size (VMPageSize)(VM vm)
{
  AVERT(VM, vm);

  return VMPageSize(vm);
}


/* VMBase -- return the base address of the memory reserved */

Addr (VMBase)(VM vm)
{
  AVERT(VM, vm);

  return VMBase(vm);
}


/* VMLimit -- return the limit address of the memory reserved */

Addr (VMLimit)(VM vm)
{
  AVERT(VM, vm);

  return VMLimit(vm);
}


/* VMReserved -- return the amount of address space reserved */

Size (VMReserved)(VM vm)
{
  AVERT(VM, vm);

  return VMReserved(vm);
}


/* VMMapped -- return the amount of memory actually mapped */

Size (VMMapped)(VM vm)
{
  AVERT(VM, vm);

  return VMMapped(vm);
}


/* VMCopy -- copy VM descriptor */

void VMCopy(VM dest, VM src)
{
  AVER(dest != NULL);
  AVERT(VM, src);

  (void)mps_lib_memcpy(dest, src, sizeof(VMStruct));
}


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2014-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
 *
 * 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 COPYRIGHT HOLDERS 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 COPYRIGHT
 * HOLDER 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.
 */