1 /*-
2 * Copyright (c) 2013 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * This software was developed by SRI International and the University of
6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
7 * ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33 #include "util.h"
34 #include "mips.h"
35 #include "cfi.h"
36
37 /*
38 * Memory-mapped Intel StrataFlash mini-driver. Very mini. Nothing fancy --
39 * and few seatbelts.
40 *
41 * XXXRW: Should we be making some effort to reset isf to a known-good state
42 * before starting, in case there was a soft reset mid-transaction.
43 *
44 * XXXRW: Would be nice to support multiple devices and also handle SD cards
45 * here ... and probably not too hard.
46 */
47 extern void *__cheri_flash_bootfs_vaddr__;
48 extern void *__cheri_flash_bootfs_len__;
49
50 #define CHERI_BOOTFS_BASE ((uintptr_t)&__cheri_flash_bootfs_vaddr__)
51 #define CHERI_BOOTFS_LENGTH ((uintptr_t)&__cheri_flash_bootfs_len__)
52
53 int
cfi_read(void * buf,unsigned lba,unsigned nblk)54 cfi_read(void *buf, unsigned lba, unsigned nblk)
55 {
56
57 if ((lba << 9) + (nblk << 9) > CHERI_BOOTFS_LENGTH)
58 return (-1);
59 memcpy(buf, (void *)(CHERI_BOOTFS_BASE + (lba << 9)), nblk << 9);
60 return (0);
61 }
62
63 uint64_t
cfi_get_mediasize(void)64 cfi_get_mediasize(void)
65 {
66
67 return (CHERI_BOOTFS_LENGTH);
68 }
69
70 uint64_t
cfi_get_sectorsize(void)71 cfi_get_sectorsize(void)
72 {
73
74 return (512); /* Always a good sector size. */
75 }
76