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
26 * $FreeBSD: src/sys/boot/i386/libi386/bootinfo.c,v 1.23.2.6 2002/01/07 07:37:52 jhb Exp $
30 #include <sys/param.h>
31 #include <sys/reboot.h>
32 #include <sys/linker.h>
33 #include <machine/bootinfo.h>
34 #include "bootstrap.h"
38 static struct bootinfo bi;
41 * Return a 'boothowto' value corresponding to the kernel arguments in
42 * (kargs) and any relevant environment variables.
49 {"boot_askname", RB_ASKNAME},
50 {"boot_cdrom", RB_CDROM},
51 {"boot_userconfig", RB_CONFIG},
54 {"boot_single", RB_SINGLE},
55 {"boot_verbose", RB_VERBOSE},
59 vm_offset_t bi_copymodules(vm_offset_t addr);
62 bi_getboothowto(char *kargs)
75 if (!active && (*cp == '-')) {
104 howto |= RB_DFLTROOT;
119 /* get equivalents from the environment */
120 for (i = 0; howto_names[i].ev != NULL; i++)
121 if (getenv(howto_names[i].ev) != NULL)
122 howto |= howto_names[i].mask;
123 if (!strcmp(getenv("console"), "comconsole"))
125 if (!strcmp(getenv("console"), "nullconsole"))
131 * Copy the environment into the load area starting at (addr).
132 * Each variable is formatted as <name>=<value>, with a single nul
133 * separating each variable, and a double nul terminating the environment.
136 bi_copyenv(vm_offset_t addr)
140 /* traverse the environment */
141 for (ep = environ; ep != NULL; ep = ep->ev_next) {
142 i386_copyin(ep->ev_name, addr, strlen(ep->ev_name));
143 addr += strlen(ep->ev_name);
144 i386_copyin("=", addr, 1);
146 if (ep->ev_value != NULL) {
147 i386_copyin(ep->ev_value, addr, strlen(ep->ev_value));
148 addr += strlen(ep->ev_value);
150 i386_copyin("", addr, 1);
153 i386_copyin("", addr, 1);
159 * Copy module-related data into the load area, where it can be
160 * used as a directory for loaded modules.
162 * Module data is presented in a self-describing format. Each datum
163 * is preceeded by a 32-bit identifier and a 32-bit size field.
165 * Currently, the following data are saved:
167 * MOD_NAME (variable) module name (string)
168 * MOD_TYPE (variable) module type (string)
169 * MOD_ARGS (variable) module parameters (string)
170 * MOD_ADDR sizeof(vm_offset_t) module load address
171 * MOD_SIZE sizeof(size_t) module size
172 * MOD_METADATA (variable) type-specific metadata
174 #define COPY32(v, a) { \
176 i386_copyin(&x, a, sizeof(x)); \
180 #define MOD_STR(t, a, s) { \
182 COPY32(strlen(s) + 1, a); \
183 i386_copyin(s, a, strlen(s) + 1); \
184 a += roundup(strlen(s) + 1, sizeof(u_long));\
187 #define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s)
188 #define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s)
189 #define MOD_ARGS(a, s) MOD_STR(MODINFO_ARGS, a, s)
191 #define MOD_VAR(t, a, s) { \
193 COPY32(sizeof(s), a); \
194 i386_copyin(&s, a, sizeof(s)); \
195 a += roundup(sizeof(s), sizeof(u_long)); \
198 #define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s)
199 #define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s)
201 #define MOD_METADATA(a, mm) { \
202 COPY32(MODINFO_METADATA | mm->md_type, a); \
203 COPY32(mm->md_size, a); \
204 i386_copyin(mm->md_data, a, mm->md_size); \
205 a += roundup(mm->md_size, sizeof(u_long));\
208 #define MOD_END(a) { \
209 COPY32(MODINFO_END, a); \
214 bi_copymodules(vm_offset_t addr)
216 struct loaded_module *mp;
217 struct module_metadata *md;
219 /* start with the first module on the list, should be the kernel */
220 for (mp = mod_findmodule(NULL, NULL); mp != NULL; mp = mp->m_next) {
222 MOD_NAME(addr, mp->m_name); /* this field must come first */
223 MOD_TYPE(addr, mp->m_type);
225 MOD_ARGS(addr, mp->m_args);
226 MOD_ADDR(addr, mp->m_addr);
227 MOD_SIZE(addr, mp->m_size);
228 for (md = mp->m_metadata; md != NULL; md = md->md_next)
229 if (!(md->md_type & MODINFOMD_NOCOPY))
230 MOD_METADATA(addr, md);
237 * Load the information expected by an i386 kernel.
239 * - The 'boothowto' argument is constructed
240 * - The 'bootdev' argument is constructed
241 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
242 * - The kernel environment is copied into kernel space.
243 * - Module metadata are formatted and placed in kernel space.
246 bi_load(char *args, int *howtop, int *bootdevp, vm_offset_t *bip)
248 struct loaded_module *xp;
249 struct i386_devdesc *rootdev;
255 const char *kernelpath;
257 *howtop = bi_getboothowto(args);
260 * Allow the environment variable 'rootdev' to override the supplied device
261 * This should perhaps go to MI code and/or have $rootdev tested/set by
262 * MI code before launching the kernel.
264 rootdevname = getenv("rootdev");
265 i386_getdev((void **)(&rootdev), rootdevname, NULL);
266 if (rootdev == NULL) { /* bad $rootdev/$currdev */
267 printf("can't determine root device\n");
271 /* Try reading the /etc/fstab file to select the root device */
272 getrootmount(i386_fmtdev((void *)rootdev));
274 /* Do legacy rootdev guessing */
276 /* XXX - use a default bootdev of 0. Is this ok??? */
279 switch(rootdev->d_type) {
281 /* Pass in BIOS device number. */
282 bi.bi_bios_dev = bc_unit2bios(rootdev->d_kind.bioscd.unit);
283 bootdevnr = bc_getdev(rootdev);
287 /* pass in the BIOS device number of the current disk */
288 bi.bi_bios_dev = bd_unit2bios(rootdev->d_kind.biosdisk.unit);
289 bootdevnr = bd_getdev(rootdev);
296 printf("WARNING - don't know how to boot from device type %d\n", rootdev->d_type);
298 if (bootdevnr == -1) {
299 printf("root device %s invalid\n", i386_fmtdev(rootdev));
303 *bootdevp = bootdevnr;
305 /* legacy bootinfo structure */
306 bi.bi_version = BOOTINFO_VERSION;
307 bi.bi_kernelname = 0; /* XXX char * -> kernel name */
308 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */
309 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */
310 for (i = 0; i < N_BIOS_GEOM; i++)
311 bi.bi_bios_geom[i] = bd_getbigeom(i);
312 bi.bi_size = sizeof(bi);
313 bi.bi_memsizes_valid = 1;
314 bi.bi_basemem = bios_basemem / 1024;
315 bi.bi_extmem = bios_extmem / 1024;
317 /* find the last module in the chain */
319 for (xp = mod_findmodule(NULL, NULL); xp != NULL; xp = xp->m_next) {
320 if (addr < (xp->m_addr + xp->m_size))
321 addr = xp->m_addr + xp->m_size;
323 /* pad to a page boundary */
324 pad = (u_int)addr & PAGE_MASK;
326 pad = PAGE_SIZE - pad;
330 /* copy our environment */
332 addr = bi_copyenv(addr);
334 /* pad to a page boundary */
335 pad = (u_int)addr & PAGE_MASK;
337 pad = PAGE_SIZE - pad;
340 /* copy module list and metadata */
341 bi.bi_modulep = addr;
342 addr = bi_copymodules(addr);
344 /* all done copying stuff in, save end of loaded object space */
345 bi.bi_kernend = addr;
347 *howtop |= RB_BOOTINFO; /* it's there now */
350 * Get the kernel name, strip off any device prefix.
352 kernelname = getenv("kernelname");
353 i386_getdev(NULL, kernelname, &kernelpath);
354 bi.bi_kernelname = VTOP(kernelpath);