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121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/* vm.c: VIRTUAL MEMORY IMPLEMENTATION
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*
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* $Id$
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* Copyright (c) 2014-2020 Ravenbrook Limited. See end of file for license.
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*
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* This is the portable part of the virtual memory implementation.
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*/
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#include "mpm.h"
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#include "vm.h"
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SRCID(vm, "$Id$");
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/* VMCheck -- check a VM structure */
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Bool VMCheck(VM vm)
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{
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CHECKS(VM, vm);
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CHECKL(vm->base != (Addr)0);
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CHECKL(vm->limit != (Addr)0);
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CHECKL(vm->base < vm->limit);
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CHECKL(ArenaGrainSizeCheck(vm->pageSize));
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CHECKL(AddrIsAligned(vm->base, vm->pageSize));
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CHECKL(AddrIsAligned(vm->limit, vm->pageSize));
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CHECKL(vm->block != NULL);
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CHECKL((Addr)vm->block <= vm->base);
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CHECKL(vm->mapped <= vm->reserved);
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return TRUE;
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}
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/* VMPageSize -- return the page size cached in the VM */
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Size (VMPageSize)(VM vm)
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{
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AVERT(VM, vm);
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return VMPageSize(vm);
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}
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/* VMBase -- return the base address of the memory reserved */
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Addr (VMBase)(VM vm)
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{
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AVERT(VM, vm);
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return VMBase(vm);
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}
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/* VMLimit -- return the limit address of the memory reserved */
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Addr (VMLimit)(VM vm)
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{
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AVERT(VM, vm);
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return VMLimit(vm);
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}
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/* VMReserved -- return the amount of address space reserved */
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Size (VMReserved)(VM vm)
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{
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AVERT(VM, vm);
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return VMReserved(vm);
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}
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/* VMMapped -- return the amount of memory actually mapped */
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Size (VMMapped)(VM vm)
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{
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AVERT(VM, vm);
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return VMMapped(vm);
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}
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/* VMCopy -- copy VM descriptor */
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void VMCopy(VM dest, VM src)
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{
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AVER(dest != NULL);
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AVERT(VM, src);
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(void)mps_lib_memcpy(dest, src, sizeof(VMStruct));
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2014-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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