mirror of https://github.com/dzavalishin/oskit/
81 lines
2.3 KiB
C
Executable File
81 lines
2.3 KiB
C
Executable File
/*
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* Copyright (c) 1996, 1998, 1999 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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#include "svm_internal.h"
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/*
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* Return information about each page in a region.
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* The region does not have to be part of a previously
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* For each page in the region, one byte in `pagemap' is
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* written indicating whether the page is in core and
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* if so, whether it has been referenced or modified
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* since the last svm_incore call or remapping.
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*
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* Address and len must be page aligned.
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*/
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int
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svm_incore(oskit_addr_t addr, oskit_size_t len, char *pagemap)
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{
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oskit_addr_t base = addr;
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char *p = pagemap;
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oskit_addr_t paddr;
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unsigned int mbits;
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/*
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* Check for page alignment of both address and length.
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*/
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if ((base && !page_aligned(base)) || !page_aligned(len))
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return OSKIT_E_INVALIDARG;
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/* XXX bad scene if we fault writing pagemap */
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SVM_LOCK();
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while (len) {
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if (svm_find_mapping(addr, &paddr, &mbits)) {
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*p = 0;
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}
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else {
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#ifdef DEBUG_SVM
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printf("svm_incore: "
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"vaddr:0x%x paddr:0x%x bits:0x%x\n",
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(int) addr, (int) paddr, mbits);
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#endif
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if (mbits & PTE_MBITS_VALID) {
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*p = SVM_INCORE_INCORE;
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if (mbits & PTE_MBITS_REF)
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*p |= SVM_INCORE_REFERENCED;
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if (mbits & PTE_MBITS_MOD)
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*p |= SVM_INCORE_MODIFIED;
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if (mbits & (PTE_MBITS_REF|PTE_MBITS_MOD)) {
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mbits &= ~(PTE_MBITS_REF|
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PTE_MBITS_MOD);
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svm_change_mapping(addr, paddr, mbits);
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}
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}
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else
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*p = 0;
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}
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addr += PAGE_SIZE;
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len -= PAGE_SIZE;
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++p;
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}
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SVM_UNLOCK();
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return 0;
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}
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