mirror of https://github.com/dzavalishin/oskit/
89 lines
2.4 KiB
C
Executable File
89 lines
2.4 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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int svm_pagein_count, svm_pagein_time;
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/*
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* Page in a page from disk.
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*
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* NB: Pages are paged through the virtual address.
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*/
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void
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svm_pagein_page(oskit_addr_t vaddr)
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{
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oskit_addr_t paddr;
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unsigned int mbits;
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int diskpage;
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oskit_u64_t before, after;
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before = get_tsc();
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if (svm_find_mapping(vaddr, &paddr, &mbits))
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panic("svm_pagein_page: Invalid vaddr:0x%x", vaddr);
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if ((mbits & PTE_MBITS_PAGED) == 0)
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panic("svm_pagein_page: Page not paged! vaddr:0x%x", vaddr);
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diskpage = btop(paddr);
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/*
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* Allocate a new physical page and plug into the ptov table.
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*/
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paddr = svm_alloc_physpage();
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SVM_PTOV(paddr) = vaddr;
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#ifdef DEBUG_SVM
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printf("svm_pagein_page: "
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"Paging in vaddr 0x%x to paddr 0x%x from diskpage:%d\n",
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vaddr, paddr, diskpage);
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#endif
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/*
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* Change the mapping. Must be writable initially.
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*/
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svm_change_mapping(vaddr, paddr, PTE_MBITS_VALID|PTE_MBITS_RW);
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/*
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* and read the data in from disk through the virtual adress.
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*/
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if (svm_swapread(diskpage, vaddr))
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panic("svm_pagein_page: "
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"Can't pagein page! vaddr:0x%x paddr:0x%x diskpage:%d",
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vaddr, paddr, diskpage);
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/*
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* success. Free the disk page.
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*/
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svm_freediskpage(diskpage);
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/*
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* Restore original mapping. Clear MOD/REF bits.
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*/
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mbits |= PTE_MBITS_VALID;
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mbits &= ~(PTE_MBITS_PAGED|PTE_MBITS_MOD|PTE_MBITS_REF);
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svm_change_mapping(vaddr, paddr, mbits);
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after = get_tsc();
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if (after > before) {
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svm_pagein_time += ((int) (after - before)) / 200;
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svm_pagein_count++;
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}
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}
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