14243f8de7
The values of the d_slice and d_partition fields of a disk_devdesc have a few values with special meanings in the disk_open() routine. Through various evolutions of the loader code over time, a d_partition value of -1 has meant both "use the first ufs partition found in the bsd label" and "don't open a bsd partition at all, open the raw slice." This defines a new special value of -2 to mean open the raw slice, and it gives symbolic names to all the special values used in d_slice and d_partition, and adjusts all existing uses of those fields to use the new constants. The phab review for this timed out without being accepted, but I'm still citing it below because there is useful commentary there. Differential Revision: https://reviews.freebsd.org/D19262
142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/*-
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* Copyright (c) 2013-2014 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <bootstrap.h>
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#include <stdarg.h>
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#include <stand.h>
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#include <disk.h>
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#include <cfi.h>
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static int beri_cfi_disk_init(void);
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static int beri_cfi_disk_open(struct open_file *, ...);
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static int beri_cfi_disk_close(struct open_file *);
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static int beri_cfi_disk_strategy(void *, int, daddr_t, size_t,
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char *, size_t *);
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static int beri_cfi_disk_print(int);
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struct devsw beri_cfi_disk = {
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.dv_name = "cfi",
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.dv_type = DEVT_DISK,
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.dv_init = beri_cfi_disk_init,
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.dv_strategy = beri_cfi_disk_strategy,
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.dv_open = beri_cfi_disk_open,
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.dv_close = beri_cfi_disk_close,
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.dv_ioctl = noioctl,
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.dv_print = beri_cfi_disk_print,
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.dv_cleanup = NULL,
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};
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static int
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beri_cfi_disk_init(void)
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{
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return (0);
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}
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static int
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beri_cfi_disk_strategy(void *devdata, int flag, daddr_t dblk, size_t size,
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char *buf, size_t *rsizep)
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{
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int error;
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flag &= F_MASK;
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if (flag == F_WRITE)
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return (EROFS);
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if (flag != F_READ)
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return (EINVAL);
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if (rsizep != NULL)
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*rsizep = 0;
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error = cfi_read(buf, dblk, size >> 9);
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if (error == 0 && rsizep != NULL)
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*rsizep = size;
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else if (error != 0)
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printf("%s: error %d\n", __func__, error);
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return (error);
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}
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static int
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beri_cfi_disk_open(struct open_file *f, ...)
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{
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va_list ap;
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struct disk_devdesc *dev;
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va_start(ap, f);
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dev = va_arg(ap, struct disk_devdesc *);
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va_end(ap);
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if (dev->dd.d_unit != 0)
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return (EIO);
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return (disk_open(dev, cfi_get_mediasize(), cfi_get_sectorsize()));
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}
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static int
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beri_cfi_disk_close(struct open_file *f)
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{
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struct disk_devdesc *dev;
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dev = (struct disk_devdesc *)f->f_devdata;
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return (disk_close(dev));
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}
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static int
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beri_cfi_disk_print(int verbose)
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{
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struct disk_devdesc dev;
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char line[80];
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int ret;
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printf("%s devices:", beri_cfi_disk.dv_name);
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if ((ret = pager_output("\n")) != 0)
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return (ret);
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snprintf(line, sizeof(line), " cfi%d CFI flash device\n", 0);
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ret = pager_output(line);
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if (ret != 0)
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return (ret);
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dev.dd.d_dev = &beri_cfi_disk;
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dev.dd.d_unit = 0;
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dev.d_slice = D_SLICENONE;
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dev.d_partition = D_PARTNONE;
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if (disk_open(&dev, cfi_get_mediasize(), cfi_get_sectorsize()) == 0) {
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snprintf(line, sizeof(line), " cfi%d", 0);
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ret = disk_print(&dev, line, verbose);
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disk_close(&dev);
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}
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return (ret);
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}
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