2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (C) 2006 Semihalf, Piotr Kruszynski <ppk@semihalf.com>
4 * Copyright (C) 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/reboot.h>
35 #include <sys/linker.h>
37 #include <machine/elf.h>
38 #include <machine/metadata.h>
40 #include "api_public.h"
41 #include "bootstrap.h"
44 #if defined(LOADER_FDT_SUPPORT)
45 extern int fdt_fixup(void);
49 * Return a 'boothowto' value corresponding to the kernel arguments in
50 * (kargs) and any relevant environment variables.
57 {"boot_askname", RB_ASKNAME},
58 {"boot_cdrom", RB_CDROM},
60 {"boot_dfltroot", RB_DFLTROOT},
62 {"boot_multicons", RB_MULTIPLE},
63 {"boot_mute", RB_MUTE},
64 {"boot_pause", RB_PAUSE},
65 {"boot_serial", RB_SERIAL},
66 {"boot_single", RB_SINGLE},
67 {"boot_verbose", RB_VERBOSE},
72 md_getboothowto(char *kargs)
85 if (!active && (*cp == '-'))
114 howto |= RB_DFLTROOT;
130 /* get equivalents from the environment */
131 for (i = 0; howto_names[i].ev != NULL; i++) {
132 if (getenv(howto_names[i].ev) != NULL)
133 howto |= howto_names[i].mask;
135 if (!strcmp(getenv("console"), "comconsole"))
137 if (!strcmp(getenv("console"), "nullconsole"))
144 * Copy the environment into the load area starting at (addr).
145 * Each variable is formatted as <name>=<value>, with a single nul
146 * separating each variable, and a double nul terminating the environment.
149 md_copyenv(vm_offset_t addr)
153 /* traverse the environment */
154 for (ep = environ; ep != NULL; ep = ep->ev_next) {
155 archsw.arch_copyin(ep->ev_name, addr, strlen(ep->ev_name));
156 addr += strlen(ep->ev_name);
157 archsw.arch_copyin("=", addr, 1);
159 if (ep->ev_value != NULL) {
160 archsw.arch_copyin(ep->ev_value, addr,
161 strlen(ep->ev_value));
162 addr += strlen(ep->ev_value);
164 archsw.arch_copyin("", addr, 1);
167 archsw.arch_copyin("", addr, 1);
173 * Copy module-related data into the load area, where it can be
174 * used as a directory for loaded modules.
176 * Module data is presented in a self-describing format. Each datum
177 * is preceded by a 32-bit identifier and a 32-bit size field.
179 * Currently, the following data are saved:
181 * MOD_NAME (variable) module name (string)
182 * MOD_TYPE (variable) module type (string)
183 * MOD_ARGS (variable) module parameters (string)
184 * MOD_ADDR sizeof(vm_offset_t) module load address
185 * MOD_SIZE sizeof(size_t) module size
186 * MOD_METADATA (variable) type-specific metadata
188 #define COPY32(v, a, c) { \
191 archsw.arch_copyin(&x, a, sizeof(x)); \
195 #define MOD_STR(t, a, s, c) { \
197 COPY32(strlen(s) + 1, a, c) \
199 archsw.arch_copyin(s, a, strlen(s) + 1);\
200 a += roundup(strlen(s) + 1, sizeof(u_long));\
203 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
204 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
205 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
207 #define MOD_VAR(t, a, s, c) { \
209 COPY32(sizeof(s), a, c); \
211 archsw.arch_copyin(&s, a, sizeof(s)); \
212 a += roundup(sizeof(s), sizeof(u_long)); \
215 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
216 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
218 #define MOD_METADATA(a, mm, c) { \
219 COPY32(MODINFO_METADATA | mm->md_type, a, c);\
220 COPY32(mm->md_size, a, c); \
222 archsw.arch_copyin(mm->md_data, a, mm->md_size);\
223 a += roundup(mm->md_size, sizeof(u_long)); \
226 #define MOD_END(a, c) { \
227 COPY32(MODINFO_END, a, c); \
232 md_copymodules(vm_offset_t addr)
234 struct preloaded_file *fp;
235 struct file_metadata *md;
240 /* start with the first module on the list, should be the kernel */
241 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
243 MOD_NAME(addr, fp->f_name, c); /* this field must be first */
244 MOD_TYPE(addr, fp->f_type, c);
246 MOD_ARGS(addr, fp->f_args, c);
247 a = fp->f_addr - __elfN(relocation_offset);
248 MOD_ADDR(addr, a, c);
249 MOD_SIZE(addr, fp->f_size, c);
250 for (md = fp->f_metadata; md != NULL; md = md->md_next) {
251 if (!(md->md_type & MODINFOMD_NOCOPY))
252 MOD_METADATA(addr, md, c);
260 * Load the information expected by a kernel.
262 * - The 'boothowto' argument is constructed
263 * - The 'bootdev' argument is constructed
264 * - The kernel environment is copied into kernel space.
265 * - Module metadata are formatted and placed in kernel space.
268 md_load(char *args, vm_offset_t *modulep)
270 struct preloaded_file *kfp, *bfp;
271 struct preloaded_file *xp;
272 struct file_metadata *md;
273 struct bootinfo *bip;
285 * These metadata addreses must be converted for kernel after
289 MODINFOMD_SSYM, MODINFOMD_ESYM, MODINFOMD_KERNEND,
291 #if defined(LOADER_FDT_SUPPORT)
296 howto = md_getboothowto(args);
299 * Allow the environment variable 'rootdev' to override the supplied
300 * device. This should perhaps go to MI code and/or have $rootdev
301 * tested/set by MI code before launching the kernel.
303 rootdevname = getenv("rootdev");
304 if (rootdevname == NULL)
305 rootdevname = getenv("currdev");
306 /* Try reading the /etc/fstab file to select the root device */
307 getrootmount(rootdevname);
309 /* Find the last module in the chain */
311 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
312 if (addr < (xp->f_addr + xp->f_size))
313 addr = xp->f_addr + xp->f_size;
315 /* Pad to a page boundary */
316 addr = roundup(addr, PAGE_SIZE);
318 /* Copy our environment */
320 addr = md_copyenv(addr);
322 /* Pad to a page boundary */
323 addr = roundup(addr, PAGE_SIZE);
326 kfp = file_findfile(NULL, "elf32 kernel");
328 kfp = file_findfile(NULL, "elf kernel");
330 panic("can't find kernel file");
331 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
332 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
334 #if defined(LOADER_FDT_SUPPORT)
335 /* Handle device tree blob */
337 if (dtbp != (vm_offset_t)NULL)
338 file_addmetadata(kfp, MODINFOMD_DTBP, sizeof dtbp, &dtbp);
340 pager_output("WARNING! Trying to fire up the kernel, but no "
341 "device tree blob found!\n");
344 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
346 /* Figure out the size and location of the metadata */
348 size = md_copymodules(0);
349 kernend = roundup(addr + size, PAGE_SIZE);
351 /* Provide MODINFOMD_KERNEND */
352 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
353 bcopy(&kernend, md->md_data, sizeof kernend);
355 /* Convert addresses to the final VA */
356 *modulep -= __elfN(relocation_offset);
358 for (i = 0; i < sizeof mdt / sizeof mdt[0]; i++) {
359 md = file_findmetadata(kfp, mdt[i]);
361 bcopy(md->md_data, &vaddr, sizeof vaddr);
362 vaddr -= __elfN(relocation_offset);
363 bcopy(&vaddr, md->md_data, sizeof vaddr);
367 /* Only now copy actual modules and metadata */
368 (void)md_copymodules(addr);