mirror of https://github.com/dzavalishin/oskit/
79 lines
2.1 KiB
C
Executable File
79 lines
2.1 KiB
C
Executable File
/*
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* Copyright (c) 1997-1999 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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/*
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* create a /dev/mem
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*/
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#include <oskit/c/fcntl.h>
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#include <oskit/c/unistd.h>
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#include <oskit/c/stdio.h>
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#include <oskit/c/errno.h>
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#include <oskit/c/assert.h>
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#include <oskit/c/fs.h>
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#include <oskit/c/fd.h>
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#include <oskit/fs/memfs.h>
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#include <oskit/machine/base_multiboot.h>
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/*
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* create a /dev/mem device under dev_name, directory for dev_name must exist!
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*/
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oskit_error_t
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make_dev_mem(char *dev_name)
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{
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int fd;
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oskit_error_t rc;
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oskit_file_t *mfile;
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struct multiboot_info *m = &boot_info;
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void *start = 0;
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oskit_off_t len;
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if (!(m->flags & MULTIBOOT_MEMORY))
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return OSKIT_EINVAL;
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if (m->mem_upper)
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len = (0x100000 + (m->mem_upper << 10));
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else
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len = (m->mem_lower << 10); /* ??? */
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fd = open(dev_name, O_RDWR | O_CREAT, 0x777);
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if (fd == -1)
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return errno;
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assert(fd_array[fd].openfile);
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rc = oskit_openfile_getfile(fd_array[fd].openfile, &mfile);
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if (rc)
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return rc;
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printf(">>> %s %p-%p (%d MBytes)\n", dev_name,
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start, start+len, (unsigned)(len >> 20));
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rc = oskit_memfs_file_set_contents(mfile,
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start /* data */,
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len /* size */,
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len /* allocsize, says writable length */,
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0 /* can_sfree */,
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1 /* inhibit_resize */);
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oskit_file_release(mfile);
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close(fd);
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if (rc)
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return rc;
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return 0;
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}
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