mirror of https://github.com/dzavalishin/oskit/
62 lines
1.8 KiB
C
Executable File
62 lines
1.8 KiB
C
Executable File
/*
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* Copyright (c) 1996-2000 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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* Protect a region. The region does not have to be part of a previously
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* allocation. This allows arbitrary protections within the applications
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* data space.
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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_protect(oskit_addr_t addr, oskit_size_t len, int prot)
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{
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oskit_addr_t base = addr;
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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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/*
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* Allow READ or READ/WRITE only.
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*/
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if (prot != SVM_PROT_READ && prot != (SVM_PROT_READ|SVM_PROT_WRITE))
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return OSKIT_E_INVALIDARG;
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SVM_LOCK();
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/*
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* Make sure the region is one that we know about.
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*/
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if (! amm_find_gen(&svm_amm, &base,
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len, AMM_ALLOCATED, AMM_ALLOCATED,
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0, 0, AMM_EXACT_ADDR)) {
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SVM_UNLOCK();
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return OSKIT_E_INVALIDARG;
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}
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svm_prot_range(addr, len, prot);
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SVM_UNLOCK();
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return 0;
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}
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