76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
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* The Qubes OS Project, http://www.qubes-os.org
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*
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* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "u2mfn-kernel.h"
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static int u2mfn_fd = -1;
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static int get_fd()
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{
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if (u2mfn_fd == -1) {
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u2mfn_fd = open("/proc/u2mfn", O_RDWR);
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if (u2mfn_fd < 0)
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return -1;
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}
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return 0;
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}
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int u2mfn_get_mfn_for_page(long va, int *mfn)
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{
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if (get_fd())
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return -1;
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*mfn = ioctl(u2mfn_fd, U2MFN_GET_MFN_FOR_PAGE, va);
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if (*mfn == -1)
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return -1;
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return 0;
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}
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int u2mfn_get_last_mfn(int *mfn)
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{
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if (get_fd())
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return -1;
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*mfn = ioctl(u2mfn_fd, U2MFN_GET_LAST_MFN, 0);
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if (*mfn == -1)
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return -1;
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return 0;
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}
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char *u2mfn_alloc_kpage()
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{
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char *ret;
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if (get_fd())
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return MAP_FAILED;
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ret =
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mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, u2mfn_fd, 0);
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return ret;
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}
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