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/* vm.c: VIRTUAL MEMORY IMPLEMENTATION
*
* $Id$
* 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, "$Id$");
/* 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.
*/
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