2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 2004, 2006 Marcel Moolenaar
4 * Copyright (c) 2014 The FreeBSD Foundation
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("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/reboot.h>
36 #include <sys/linker.h>
38 #include <machine/cpufunc.h>
39 #include <machine/metadata.h>
40 #include <machine/psl.h>
41 #include <machine/specialreg.h>
46 #include "bootstrap.h"
47 #include "framebuffer.h"
52 static const char howto_switches[] = "aCdrgDmphsv";
53 static int howto_masks[] = {
54 RB_ASKNAME, RB_CDROM, RB_KDB, RB_DFLTROOT, RB_GDB, RB_MULTIPLE,
55 RB_MUTE, RB_PAUSE, RB_SERIAL, RB_SINGLE, RB_VERBOSE
59 bi_getboothowto(char *kargs)
67 /* Get the boot options from the environment first. */
68 for (i = 0; howto_names[i].ev != NULL; i++) {
69 if (getenv(howto_names[i].ev) != NULL)
70 howto |= howto_names[i].mask;
77 opts = strchr(kargs, '-');
78 while (opts != NULL) {
79 while (*(++opts) != '\0') {
80 sw = strchr(howto_switches, *opts);
83 howto |= howto_masks[sw - howto_switches];
85 opts = strchr(opts, '-');
92 * Copy the environment into the load area starting at (addr).
93 * Each variable is formatted as <name>=<value>, with a single nul
94 * separating each variable, and a double nul terminating the environment.
97 bi_copyenv(vm_offset_t start)
100 vm_offset_t addr, last;
105 /* Traverse the environment. */
106 for (ep = environ; ep != NULL; ep = ep->ev_next) {
107 len = strlen(ep->ev_name);
108 if (x86_efi_copyin(ep->ev_name, addr, len) != len)
111 if (x86_efi_copyin("=", addr, 1) != 1)
114 if (ep->ev_value != NULL) {
115 len = strlen(ep->ev_value);
116 if (x86_efi_copyin(ep->ev_value, addr, len) != len)
120 if (x86_efi_copyin("", addr, 1) != 1)
125 if (x86_efi_copyin("", last++, 1) != 1)
131 * Copy module-related data into the load area, where it can be
132 * used as a directory for loaded modules.
134 * Module data is presented in a self-describing format. Each datum
135 * is preceded by a 32-bit identifier and a 32-bit size field.
137 * Currently, the following data are saved:
139 * MOD_NAME (variable) module name (string)
140 * MOD_TYPE (variable) module type (string)
141 * MOD_ARGS (variable) module parameters (string)
142 * MOD_ADDR sizeof(vm_offset_t) module load address
143 * MOD_SIZE sizeof(size_t) module size
144 * MOD_METADATA (variable) type-specific metadata
146 #define COPY32(v, a, c) { \
149 x86_efi_copyin(&x, a, sizeof(x)); \
153 #define MOD_STR(t, a, s, c) { \
155 COPY32(strlen(s) + 1, a, c); \
157 x86_efi_copyin(s, a, strlen(s) + 1); \
158 a += roundup(strlen(s) + 1, sizeof(uint64_t)); \
161 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
162 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
163 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
165 #define MOD_VAR(t, a, s, c) { \
167 COPY32(sizeof(s), a, c); \
169 x86_efi_copyin(&s, a, sizeof(s)); \
170 a += roundup(sizeof(s), sizeof(uint64_t)); \
173 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
174 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
176 #define MOD_METADATA(a, mm, c) { \
177 COPY32(MODINFO_METADATA | mm->md_type, a, c); \
178 COPY32(mm->md_size, a, c); \
180 x86_efi_copyin(mm->md_data, a, mm->md_size); \
181 a += roundup(mm->md_size, sizeof(uint64_t)); \
184 #define MOD_END(a, c) { \
185 COPY32(MODINFO_END, a, c); \
190 bi_copymodules(vm_offset_t addr)
192 struct preloaded_file *fp;
193 struct file_metadata *md;
198 /* Start with the first module on the list, should be the kernel. */
199 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
200 MOD_NAME(addr, fp->f_name, c); /* This must come first. */
201 MOD_TYPE(addr, fp->f_type, c);
203 MOD_ARGS(addr, fp->f_args, c);
205 MOD_ADDR(addr, v, c);
207 MOD_SIZE(addr, v, c);
208 for (md = fp->f_metadata; md != NULL; md = md->md_next)
209 if (!(md->md_type & MODINFOMD_NOCOPY))
210 MOD_METADATA(addr, md, c);
217 bi_load_efi_data(struct preloaded_file *kfp)
219 EFI_MEMORY_DESCRIPTOR *mm;
220 EFI_PHYSICAL_ADDRESS addr;
223 UINTN mmsz, pages, sz;
225 struct efi_map_header *efihdr;
228 if (efi_find_framebuffer(&efifb) == 0)
229 file_addmetadata(kfp, MODINFOMD_EFI_FB, sizeof(efifb), &efifb);
231 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
234 * Allocate enough pages to hold the bootinfo block and the memory
235 * map EFI will return to us. The memory map has an unknown size,
236 * so we have to determine that first. Note that the AllocatePages
237 * call can itself modify the memory map, so we have to take that
238 * into account as well. The changes to the memory map are caused
239 * by splitting a range of free memory into two (AFAICT), so that
240 * one is marked as being loader data.
243 BS->GetMemoryMap(&sz, NULL, &x86_efi_mapkey, &mmsz, &mmver);
245 sz = (sz + 0xf) & ~0xf;
246 pages = EFI_SIZE_TO_PAGES(sz + efisz);
247 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, pages,
249 if (EFI_ERROR(status)) {
250 printf("%s: AllocatePages() returned 0x%lx\n", __func__,
256 * Read the memory map and stash it after bootinfo. Align the
257 * memory map on a 16-byte boundary (the bootinfo block is page
260 efihdr = (struct efi_map_header *)addr;
261 mm = (void *)((uint8_t *)efihdr + efisz);
262 sz = (EFI_PAGE_SIZE * pages) - efisz;
263 status = BS->GetMemoryMap(&sz, mm, &x86_efi_mapkey, &mmsz, &mmver);
264 if (EFI_ERROR(status)) {
265 printf("%s: GetMemoryMap() returned 0x%lx\n", __func__,
270 efihdr->memory_size = sz;
271 efihdr->descriptor_size = mmsz;
272 efihdr->descriptor_version = mmver;
274 file_addmetadata(kfp, MODINFOMD_EFI_MAP, efisz + sz, efihdr);
280 * Load the information expected by an amd64 kernel.
282 * - The 'boothowto' argument is constructed.
283 * - The 'bootdev' argument is constructed.
284 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
285 * - The kernel environment is copied into kernel space.
286 * - Module metadata are formatted and placed in kernel space.
289 bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp)
291 struct preloaded_file *xp, *kfp;
292 struct devdesc *rootdev;
293 struct file_metadata *md;
301 howto = bi_getboothowto(args);
304 * Allow the environment variable 'rootdev' to override the supplied
305 * device. This should perhaps go to MI code and/or have $rootdev
306 * tested/set by MI code before launching the kernel.
308 rootdevname = getenv("rootdev");
309 x86_efi_getdev((void**)(&rootdev), rootdevname, NULL);
310 if (rootdev == NULL) {
311 printf("Can't determine root device.\n");
315 /* Try reading the /etc/fstab file to select the root device */
316 getrootmount(x86_efi_fmtdev((void *)rootdev));
319 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
320 if (addr < (xp->f_addr + xp->f_size))
321 addr = xp->f_addr + xp->f_size;
324 /* Pad to a page boundary. */
325 addr = roundup(addr, PAGE_SIZE);
327 /* Copy our environment. */
329 addr = bi_copyenv(addr);
331 /* Pad to a page boundary. */
332 addr = roundup(addr, PAGE_SIZE);
334 kfp = file_findfile(NULL, "elf kernel");
336 kfp = file_findfile(NULL, "elf64 kernel");
338 panic("can't find kernel file");
339 kernend = 0; /* fill it in later */
340 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
341 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
342 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
344 bi_load_efi_data(kfp);
346 /* Figure out the size and location of the metadata. */
348 size = bi_copymodules(0);
349 kernend = roundup(addr + size, PAGE_SIZE);
352 /* patch MODINFOMD_KERNEND */
353 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
354 bcopy(&kernend, md->md_data, sizeof kernend);
356 /* Copy module list and metadata. */
357 (void)bi_copymodules(addr);