mirror of https://github.com/dzavalishin/oskit/
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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/*
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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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* Unmap a region.
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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_dealloc(oskit_addr_t addr, oskit_size_t len)
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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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SVM_LOCK();
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/*
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* Make sure the region is one thats been allocated, but not part
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* of the SVM reserved region.
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*/
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if (! amm_find_gen(&svm_amm, &base,
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len, AMM_ALLOCATED, AMM_ALLOCATED|SVM_PROT_PHYS,
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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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if (amm_deallocate(&svm_amm, addr, len))
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panic("svm_dealloc: Can't AMM unmap range");
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/*
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* Do this in a page loop, finding the actual pte info since
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* we need to know the physical page number so it can be given
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* back to the lmm.
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*/
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while (len > 0) {
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oskit_addr_t pa;
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unsigned int obits;
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if (svm_find_mapping(addr, &pa, &obits))
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panic("svm_protect: No PTE for 0x%x\n", addr);
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#ifdef DEBUG_SVM
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printf("svm_dealloc: Mapping for 0x%x = pa:0x%x bits:0x%x\n",
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addr, pa, obits);
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#endif
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/*
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* Unmap the virtual page first.
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*/
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if (obits & PTE_MBITS_VALID) { /* XXX ? */
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svm_unmap_range(addr, PAGE_SIZE);
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ftlbentry(addr);
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}
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/*
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* The phys page might be a real physical address, or it
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* might be a zfill, or it might be a disk block number.
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*/
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if (obits & (PTE_MBITS_ZFILL|PTE_MBITS_PAGED))
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goto nextpage;
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svm_dealloc_physpage(pa);
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/*
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* Remove translation from the ptov table if paging enabled.
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*/
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if (svm_paging)
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SVM_PTOV(pa) = SVM_NULL_PTOV;
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nextpage:
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addr += PAGE_SIZE;
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len -= PAGE_SIZE;
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}
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SVM_UNLOCK();
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return 0;
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}
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