1 /*-
2 * Copyright (C) 2018 Breno Leitao
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
18 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
19 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
20 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
21 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
22 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25 #include <sys/cdefs.h>
26 #include <sys/param.h>
27 #include <sys/kernel.h>
28 #include <sys/systm.h>
29 #include <sys/module.h>
30 #include <sys/types.h>
31 #include <sys/proc.h>
32
33 #include <vm/vm.h>
34 #include <vm/pmap.h>
35
36 #include <machine/bus.h>
37 #include <machine/elf.h>
38 #include <machine/param.h>
39
40 #include <dev/ofw/openfirm.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
43
44 #include "opt_md.h"
45
46 extern u_char *mfs_root;
47 extern int mfs_root_size;
48
49 static void ofw_initrd_probe_and_attach(void *junk);
50
51 SYSINIT(ofw_initrd_probe_and_attach, SI_SUB_KMEM, SI_ORDER_ANY,
52 ofw_initrd_probe_and_attach, NULL);
53
54 static void
ofw_initrd_probe_and_attach(void * junk)55 ofw_initrd_probe_and_attach(void *junk)
56 {
57 phandle_t chosen;
58 vm_paddr_t start, end;
59 pcell_t cell[2];
60 ssize_t size;
61 u_char *taste;
62 Elf_Ehdr ehdr;
63
64 if (!hw_direct_map)
65 return;
66
67 chosen = OF_finddevice("/chosen");
68 if (chosen <= 0)
69 return;
70
71 if (!OF_hasprop(chosen, "linux,initrd-start") ||
72 !OF_hasprop(chosen, "linux,initrd-end"))
73 return;
74
75 size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell));
76 if (size == 4)
77 start = cell[0];
78 else if (size == 8)
79 start = (uint64_t)cell[0] << 32 | cell[1];
80 else {
81 printf("ofw_initrd: Wrong linux,initrd-start size\n");
82 return;
83 }
84
85 size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell));
86 if (size == 4)
87 end = cell[0];
88 else if (size == 8)
89 end = (uint64_t)cell[0] << 32 | cell[1];
90 else{
91 printf("ofw_initrd: Wrong linux,initrd-end size\n");
92 return;
93 }
94
95 if (end - start > 0) {
96 taste = (u_char*) PHYS_TO_DMAP(start);
97 memcpy(&ehdr, taste, sizeof(ehdr));
98
99 if (IS_ELF(ehdr)) {
100 printf("ofw_initrd: initrd is kernel image!\n");
101 return;
102 }
103
104 mfs_root = taste;
105 mfs_root_size = end - start;
106 printf("ofw_initrd: initrd loaded at 0x%08lx-0x%08lx\n",
107 start, end);
108 }
109 }
110