1 /*-
2 * Copyright (C) 2014 Nathan Whitehorn
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/types.h>
27 #include <fdt_platform.h>
28 #include <libfdt.h>
29 #include "kboot.h"
30
31 /* Fix up wrong values added to the device tree by prom_init() in Linux */
32
33 void
fdt_arch_fixups(void * fdtp)34 fdt_arch_fixups(void *fdtp)
35 {
36 int offset, len;
37 const void *prop;
38
39 /*
40 * Remove /memory/available properties, which reflect long-gone OF
41 * state
42 */
43
44 offset = fdt_path_offset(fdtp, "/memory@0");
45 if (offset > 0)
46 fdt_delprop(fdtp, offset, "available");
47
48 /*
49 * Add reservations for OPAL and RTAS state if present
50 */
51
52 offset = fdt_path_offset(fdtp, "/ibm,opal");
53 if (offset > 0) {
54 const uint64_t *base, *size;
55 base = fdt_getprop(fdtp, offset, "opal-base-address",
56 &len);
57 size = fdt_getprop(fdtp, offset, "opal-runtime-size",
58 &len);
59 if (base != NULL && size != NULL)
60 fdt_add_mem_rsv(fdtp, fdt64_to_cpu(*base),
61 fdt64_to_cpu(*size));
62 }
63 offset = fdt_path_offset(fdtp, "/rtas");
64 if (offset > 0) {
65 const uint32_t *base, *size;
66 base = fdt_getprop(fdtp, offset, "linux,rtas-base", &len);
67 size = fdt_getprop(fdtp, offset, "rtas-size", &len);
68 if (base != NULL && size != NULL)
69 fdt_add_mem_rsv(fdtp, fdt32_to_cpu(*base),
70 fdt32_to_cpu(*size));
71 }
72
73 /*
74 * Patch up /chosen nodes so that the stored handles mean something,
75 * where possible.
76 */
77 offset = fdt_path_offset(fdtp, "/chosen");
78 if (offset > 0) {
79 fdt_delprop(fdtp, offset, "cpu"); /* This node not meaningful */
80
81 offset = fdt_path_offset(fdtp, "/chosen");
82 prop = fdt_getprop(fdtp, offset, "linux,stdout-package", &len);
83 if (prop != NULL) {
84 fdt_setprop(fdtp, offset, "stdout", prop, len);
85 offset = fdt_path_offset(fdtp, "/chosen");
86 fdt_setprop(fdtp, offset, "stdin", prop, len);
87 }
88 }
89 }
90