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/*
* Copyright (c) 1996, 1998, 1999 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
#include "svm_internal.h"
/*
* Unmap a region.
*
* Address and len must be page aligned.
*/
int
svm_dealloc(oskit_addr_t addr, oskit_size_t len)
{
oskit_addr_t base = addr;
/*
* Check for page alignment of both address and length.
*/
if ((base && !page_aligned(base)) || !page_aligned(len))
return OSKIT_E_INVALIDARG;
SVM_LOCK();
/*
* Make sure the region is one thats been allocated.
*/
if (! amm_find_gen(&svm_amm, &base,
len, AMM_ALLOCATED, AMM_ALLOCATED,
0, 0, AMM_EXACT_ADDR)) {
SVM_UNLOCK();
return OSKIT_E_INVALIDARG;
}
if (amm_deallocate(&svm_amm, addr, len))
panic("svm_dealloc: Can't AMM unmap range");
/*
* Do this in a page loop, finding the actual pte info since
* we need to know the physical page number so it can be given
* back to the lmm.
*/
while (len > 0) {
oskit_addr_t pa;
unsigned int obits;
if (svm_find_mapping(addr, &pa, &obits))
panic("svm_protect: No PTE for 0x%x\n", addr);
#ifdef DEBUG_SVM
printf("svm_dealloc: Mapping for 0x%x = pa:0x%x bits:0x%x\n",
addr, pa, obits);
#endif
/*
* Unmap the virtual page first.
*/
if (obits & PTE_MBITS_VALID) { /* XXX ? */
svm_unmap_range(addr, PAGE_SIZE);
ftlbentry(addr);
}
/*
* The phys page might be a real physical address, or it
* might be a zfill, or it might be a disk block number.
*/
if (obits & (PTE_MBITS_ZFILL|PTE_MBITS_PAGED))
goto nextpage;
svm_dealloc_physpage(pa);
/*
* Remove translation from the ptov table if paging enabled.
*/
if (svm_paging)
SVM_PTOV(pa) = SVM_NULL_PTOV;
nextpage:
addr += PAGE_SIZE;
len -= PAGE_SIZE;
}
SVM_UNLOCK();
return 0;
}
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