1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <stand.h>
28 #include <sys/param.h>
29 #include <sys/reboot.h>
30 #include <sys/linker.h>
31 #include <i386/include/bootinfo.h>
32
33 #include "bootstrap.h"
34 #include "modinfo.h"
35 #include "libuserboot.h"
36
37 #ifdef LOADER_GELI_SUPPORT
38 #include "geliboot.h"
39 #endif
40
41 static struct bootinfo bi;
42
43 /*
44 * Load the information expected by an i386 kernel.
45 *
46 * - The 'boothowto' argument is constructed
47 * - The 'bootdev' argument is constructed
48 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
49 * - The kernel environment is copied into kernel space.
50 * - Module metadata are formatted and placed in kernel space.
51 */
52 int
bi_load32(char * args,int * howtop,int * bootdevp,vm_offset_t * bip,vm_offset_t * modulep,vm_offset_t * kernendp)53 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
54 {
55 struct preloaded_file *xp, *kfp;
56 struct devdesc *rootdev;
57 struct file_metadata *md;
58 vm_offset_t addr;
59 vm_offset_t kernend;
60 vm_offset_t envp;
61 vm_offset_t size;
62 vm_offset_t ssym, esym;
63 char *rootdevname;
64 int bootdevnr, howto;
65 char *kernelname;
66 const char *kernelpath;
67 uint64_t lowmem, highmem;
68
69 howto = bi_getboothowto(args);
70
71 /*
72 * Allow the environment variable 'rootdev' to override the supplied device
73 * This should perhaps go to MI code and/or have $rootdev tested/set by
74 * MI code before launching the kernel.
75 */
76 rootdevname = getenv("rootdev");
77 userboot_getdev((void **)(&rootdev), rootdevname, NULL);
78 if (rootdev == NULL) { /* bad $rootdev/$currdev */
79 printf("can't determine root device\n");
80 return(EINVAL);
81 }
82
83 /* Try reading the /etc/fstab file to select the root device */
84 getrootmount(devformat(rootdev));
85
86 bootdevnr = 0;
87 #if 0
88 if (bootdevnr == -1) {
89 printf("root device %s invalid\n", devformat(rootdev));
90 return (EINVAL);
91 }
92 #endif
93 free(rootdev);
94
95 /* find the last module in the chain */
96 addr = 0;
97 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
98 if (addr < (xp->f_addr + xp->f_size))
99 addr = xp->f_addr + xp->f_size;
100 }
101 /* pad to a page boundary */
102 addr = roundup(addr, PAGE_SIZE);
103
104 /* copy our environment */
105 envp = addr;
106 addr = md_copyenv(addr);
107
108 /* pad to a page boundary */
109 addr = roundup(addr, PAGE_SIZE);
110
111 kfp = file_findfile(NULL, "elf kernel");
112 if (kfp == NULL)
113 kfp = file_findfile(NULL, "elf32 kernel");
114 if (kfp == NULL)
115 panic("can't find kernel file");
116 kernend = 0; /* fill it in later */
117 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
118 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
119 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
120 bios_addsmapdata(kfp);
121 #ifdef LOADER_GELI_SUPPORT
122 geli_export_key_metadata(kfp);
123 #endif
124
125 /* Figure out the size and location of the metadata */
126 *modulep = addr;
127 size = md_copymodules(0, false);
128 kernend = roundup(addr + size, PAGE_SIZE);
129 *kernendp = kernend;
130
131 /* patch MODINFOMD_KERNEND */
132 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
133 bcopy(&kernend, md->md_data, sizeof kernend);
134
135 /* copy module list and metadata */
136 (void)md_copymodules(addr, false);
137
138 ssym = esym = 0;
139 md = file_findmetadata(kfp, MODINFOMD_SSYM);
140 if (md != NULL)
141 ssym = *((vm_offset_t *)&(md->md_data));
142 md = file_findmetadata(kfp, MODINFOMD_ESYM);
143 if (md != NULL)
144 esym = *((vm_offset_t *)&(md->md_data));
145 if (ssym == 0 || esym == 0)
146 ssym = esym = 0; /* sanity */
147
148 /* legacy bootinfo structure */
149 kernelname = getenv("kernelname");
150 userboot_getdev(NULL, kernelname, &kernelpath);
151 bi.bi_version = BOOTINFO_VERSION;
152 bi.bi_size = sizeof(bi);
153 CALLBACK(getmem, &lowmem, &highmem);
154 bi.bi_memsizes_valid = 1;
155 bi.bi_basemem = 640;
156 bi.bi_extmem = (lowmem - 0x100000) / 1024;
157 bi.bi_envp = envp;
158 bi.bi_modulep = *modulep;
159 bi.bi_kernend = kernend;
160 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */
161 bi.bi_esymtab = esym;
162
163 /*
164 * Copy the legacy bootinfo and kernel name to the guest at 0x2000
165 */
166 bi.bi_kernelname = 0x2000 + sizeof(bi);
167 CALLBACK(copyin, &bi, 0x2000, sizeof(bi));
168 CALLBACK(copyin, kernelname, 0x2000 + sizeof(bi), strlen(kernelname) + 1);
169
170 /* legacy boot arguments */
171 *howtop = howto | RB_BOOTINFO;
172 *bootdevp = bootdevnr;
173 *bip = 0x2000;
174
175 return(0);
176 }
177