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 static struct bootinfo bi;
42 * Copy module-related data into the load area, where it can be
43 * used as a directory for loaded modules.
45 * Module data is presented in a self-describing format. Each datum
46 * is preceded by a 32-bit identifier and a 32-bit size field.
48 * Currently, the following data are saved:
50 * MOD_NAME (variable) module name (string)
51 * MOD_TYPE (variable) module type (string)
52 * MOD_ARGS (variable) module parameters (string)
53 * MOD_ADDR sizeof(vm_offset_t) module load address
54 * MOD_SIZE sizeof(size_t) module size
55 * MOD_METADATA (variable) type-specific metadata
57 #define COPY32(v, a, c) { \
60 CALLBACK(copyin, &x, a, sizeof(x)); \
64 #define MOD_STR(t, a, s, c) { \
66 COPY32(strlen(s) + 1, a, c); \
68 CALLBACK(copyin, s, a, strlen(s) + 1); \
69 a += roundup(strlen(s) + 1, sizeof(uint32_t));\
72 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
73 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
74 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
76 #define MOD_VAR(t, a, s, c) { \
78 COPY32(sizeof(s), a, c); \
80 CALLBACK(copyin, &s, a, sizeof(s)); \
81 a += roundup(sizeof(s), sizeof(uint32_t)); \
84 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
85 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
87 #define MOD_METADATA(a, mm, c) { \
88 COPY32(MODINFO_METADATA | mm->md_type, a, c); \
89 COPY32(mm->md_size, a, c); \
91 CALLBACK(copyin, mm->md_data, a, mm->md_size); \
92 a += roundup(mm->md_size, sizeof(uint32_t));\
95 #define MOD_END(a, c) { \
96 COPY32(MODINFO_END, a, c); \
101 bi_copymodules32(vm_offset_t addr)
103 struct preloaded_file *fp;
104 struct file_metadata *md;
108 /* start with the first module on the list, should be the kernel */
109 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
111 MOD_NAME(addr, fp->f_name, c); /* this field must come first */
112 MOD_TYPE(addr, fp->f_type, c);
114 MOD_ARGS(addr, fp->f_args, c);
115 MOD_ADDR(addr, fp->f_addr, c);
116 MOD_SIZE(addr, fp->f_size, c);
117 for (md = fp->f_metadata; md != NULL; md = md->md_next)
118 if (!(md->md_type & MODINFOMD_NOCOPY))
119 MOD_METADATA(addr, md, c);
126 * Load the information expected by an i386 kernel.
128 * - The 'boothowto' argument is constructed
129 * - The 'bootdev' argument is constructed
130 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
131 * - The kernel environment is copied into kernel space.
132 * - Module metadata are formatted and placed in kernel space.
135 bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
137 struct preloaded_file *xp, *kfp;
138 struct i386_devdesc *rootdev;
139 struct file_metadata *md;
144 vm_offset_t ssym, esym;
146 int bootdevnr, howto;
148 const char *kernelpath;
149 uint64_t lowmem, highmem;
151 howto = bi_getboothowto(args);
154 * Allow the environment variable 'rootdev' to override the supplied device
155 * This should perhaps go to MI code and/or have $rootdev tested/set by
156 * MI code before launching the kernel.
158 rootdevname = getenv("rootdev");
159 userboot_getdev((void **)(&rootdev), rootdevname, NULL);
160 if (rootdev == NULL) { /* bad $rootdev/$currdev */
161 printf("can't determine root device\n");
165 /* Try reading the /etc/fstab file to select the root device */
166 getrootmount(userboot_fmtdev((void *)rootdev));
170 if (bootdevnr == -1) {
171 printf("root device %s invalid\n", i386_fmtdev(rootdev));
177 /* find the last module in the chain */
179 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
180 if (addr < (xp->f_addr + xp->f_size))
181 addr = xp->f_addr + xp->f_size;
183 /* pad to a page boundary */
184 addr = roundup(addr, PAGE_SIZE);
186 /* copy our environment */
188 addr = bi_copyenv(addr);
190 /* pad to a page boundary */
191 addr = roundup(addr, PAGE_SIZE);
193 kfp = file_findfile(NULL, "elf kernel");
195 kfp = file_findfile(NULL, "elf32 kernel");
197 panic("can't find kernel file");
198 kernend = 0; /* fill it in later */
199 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
200 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
201 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
202 bios_addsmapdata(kfp);
204 /* Figure out the size and location of the metadata */
206 size = bi_copymodules32(0);
207 kernend = roundup(addr + size, PAGE_SIZE);
210 /* patch MODINFOMD_KERNEND */
211 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
212 bcopy(&kernend, md->md_data, sizeof kernend);
214 /* copy module list and metadata */
215 (void)bi_copymodules32(addr);
218 md = file_findmetadata(kfp, MODINFOMD_SSYM);
220 ssym = *((vm_offset_t *)&(md->md_data));
221 md = file_findmetadata(kfp, MODINFOMD_ESYM);
223 esym = *((vm_offset_t *)&(md->md_data));
224 if (ssym == 0 || esym == 0)
225 ssym = esym = 0; /* sanity */
227 /* legacy bootinfo structure */
228 kernelname = getenv("kernelname");
229 userboot_getdev(NULL, kernelname, &kernelpath);
230 bi.bi_version = BOOTINFO_VERSION;
231 bi.bi_kernelname = 0; /* XXX char * -> kernel name */
232 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */
233 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */
235 for (i = 0; i < N_BIOS_GEOM; i++)
236 bi.bi_bios_geom[i] = bd_getbigeom(i);
238 bi.bi_size = sizeof(bi);
239 CALLBACK(getmem, &lowmem, &highmem);
240 bi.bi_memsizes_valid = 1;
242 bi.bi_extmem = (lowmem - 0x100000) / 1024;
244 bi.bi_modulep = *modulep;
245 bi.bi_kernend = kernend;
246 bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */
247 bi.bi_esymtab = esym;
250 * Copy the legacy bootinfo and kernel name to the guest at 0x2000
252 bi.bi_kernelname = 0x2000 + sizeof(bi);
253 CALLBACK(copyin, &bi, 0x2000, sizeof(bi));
254 CALLBACK(copyin, kernelname, 0x2000 + sizeof(bi), strlen(kernelname) + 1);
256 /* legacy boot arguments */
257 *howtop = howto | RB_BOOTINFO;
258 *bootdevp = bootdevnr;