2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/reboot.h>
33 #include <sys/linker.h>
34 #include <i386/include/bootinfo.h>
36 #include "bootstrap.h"
37 #include "libuserboot.h"
39 #ifdef LOADER_GELI_SUPPORT
43 static struct bootinfo bi;
46 * Copy module-related data into the load area, where it can be
47 * used as a directory for loaded modules.
49 * Module data is presented in a self-describing format. Each datum
50 * is preceded by a 32-bit identifier and a 32-bit size field.
52 * Currently, the following data are saved:
54 * MOD_NAME (variable) module name (string)
55 * MOD_TYPE (variable) module type (string)
56 * MOD_ARGS (variable) module parameters (string)
57 * MOD_ADDR sizeof(vm_offset_t) module load address
58 * MOD_SIZE sizeof(size_t) module size
59 * MOD_METADATA (variable) type-specific metadata
61 #define COPY32(v, a, c) { \
64 CALLBACK(copyin, &x, a, sizeof(x)); \
68 #define MOD_STR(t, a, s, c) { \
70 COPY32(strlen(s) + 1, a, c); \
72 CALLBACK(copyin, s, a, strlen(s) + 1); \
73 a += roundup(strlen(s) + 1, sizeof(uint32_t));\
76 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
77 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
78 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
80 #define MOD_VAR(t, a, s, c) { \
82 COPY32(sizeof(s), a, c); \
84 CALLBACK(copyin, &s, a, sizeof(s)); \
85 a += roundup(sizeof(s), sizeof(uint32_t)); \
88 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
89 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
91 #define MOD_METADATA(a, mm, c) { \
92 COPY32(MODINFO_METADATA | mm->md_type, a, c); \
93 COPY32(mm->md_size, a, c); \
95 CALLBACK(copyin, mm->md_data, a, mm->md_size); \
96 a += roundup(mm->md_size, sizeof(uint32_t));\
99 #define MOD_END(a, c) { \
100 COPY32(MODINFO_END, a, c); \
105 bi_copymodules32(vm_offset_t addr)
107 struct preloaded_file *fp;
108 struct file_metadata *md;
112 /* start with the first module on the list, should be the kernel */
113 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
115 MOD_NAME(addr, fp->f_name, c); /* this field must come first */
116 MOD_TYPE(addr, fp->f_type, c);
118 MOD_ARGS(addr, fp->f_args, c);
119 MOD_ADDR(addr, fp->f_addr, c);
120 MOD_SIZE(addr, fp->f_size, c);
121 for (md = fp->f_metadata; md != NULL; md = md->md_next)
122 if (!(md->md_type & MODINFOMD_NOCOPY))
123 MOD_METADATA(addr, md, c);
130 * Load the information expected by an i386 kernel.
132 * - The 'boothowto' argument is constructed
133 * - The 'bootdev' argument is constructed
134 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
135 * - The kernel environment is copied into kernel space.
136 * - Module metadata are formatted and placed in kernel space.
139 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
141 struct preloaded_file *xp, *kfp;
142 struct i386_devdesc *rootdev;
143 struct file_metadata *md;
148 vm_offset_t ssym, esym;
150 int bootdevnr, howto;
152 const char *kernelpath;
153 uint64_t lowmem, highmem;
155 howto = bi_getboothowto(args);
158 * Allow the environment variable 'rootdev' to override the supplied device
159 * This should perhaps go to MI code and/or have $rootdev tested/set by
160 * MI code before launching the kernel.
162 rootdevname = getenv("rootdev");
163 userboot_getdev((void **)(&rootdev), rootdevname, NULL);
164 if (rootdev == NULL) { /* bad $rootdev/$currdev */
165 printf("can't determine root device\n");
169 /* Try reading the /etc/fstab file to select the root device */
170 getrootmount(userboot_fmtdev((void *)rootdev));
174 if (bootdevnr == -1) {
175 printf("root device %s invalid\n", i386_fmtdev(rootdev));
181 /* find the last module in the chain */
183 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
184 if (addr < (xp->f_addr + xp->f_size))
185 addr = xp->f_addr + xp->f_size;
187 /* pad to a page boundary */
188 addr = roundup(addr, PAGE_SIZE);
190 /* copy our environment */
192 addr = bi_copyenv(addr);
194 /* pad to a page boundary */
195 addr = roundup(addr, PAGE_SIZE);
197 kfp = file_findfile(NULL, "elf kernel");
199 kfp = file_findfile(NULL, "elf32 kernel");
201 panic("can't find kernel file");
202 kernend = 0; /* fill it in later */
203 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
204 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
205 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
206 bios_addsmapdata(kfp);
207 #ifdef LOADER_GELI_SUPPORT
208 geli_export_key_metadata(kfp);
211 /* Figure out the size and location of the metadata */
213 size = bi_copymodules32(0);
214 kernend = roundup(addr + size, PAGE_SIZE);
217 /* patch MODINFOMD_KERNEND */
218 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
219 bcopy(&kernend, md->md_data, sizeof kernend);
221 /* copy module list and metadata */
222 (void)bi_copymodules32(addr);
225 md = file_findmetadata(kfp, MODINFOMD_SSYM);
227 ssym = *((vm_offset_t *)&(md->md_data));
228 md = file_findmetadata(kfp, MODINFOMD_ESYM);
230 esym = *((vm_offset_t *)&(md->md_data));
231 if (ssym == 0 || esym == 0)
232 ssym = esym = 0; /* sanity */
234 /* legacy bootinfo structure */
235 kernelname = getenv("kernelname");
236 userboot_getdev(NULL, kernelname, &kernelpath);
237 bi.bi_version = BOOTINFO_VERSION;
238 bi.bi_kernelname = 0; /* XXX char * -> kernel name */
239 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */
240 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */
242 for (i = 0; i < N_BIOS_GEOM; i++)
243 bi.bi_bios_geom[i] = bd_getbigeom(i);
245 bi.bi_size = sizeof(bi);
246 CALLBACK(getmem, &lowmem, &highmem);
247 bi.bi_memsizes_valid = 1;
249 bi.bi_extmem = (lowmem - 0x100000) / 1024;
251 bi.bi_modulep = *modulep;
252 bi.bi_kernend = kernend;
253 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */
254 bi.bi_esymtab = esym;
257 * Copy the legacy bootinfo and kernel name to the guest at 0x2000
259 bi.bi_kernelname = 0x2000 + sizeof(bi);
260 CALLBACK(copyin, &bi, 0x2000, sizeof(bi));
261 CALLBACK(copyin, kernelname, 0x2000 + sizeof(bi), strlen(kernelname) + 1);
263 /* legacy boot arguments */
264 *howtop = howto | RB_BOOTINFO;
265 *bootdevp = bootdevnr;