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/elf.h>
40 #include <machine/metadata.h>
41 #include <machine/psl.h>
46 #include "bootstrap.h"
47 #include "loader_efi.h"
49 #if defined(__amd64__)
50 #include <machine/specialreg.h>
51 #include "framebuffer.h"
54 #if defined(LOADER_FDT_SUPPORT)
55 #include <fdt_platform.h>
60 static const char howto_switches[] = "aCdrgDmphsv";
61 static int howto_masks[] = {
62 RB_ASKNAME, RB_CDROM, RB_KDB, RB_DFLTROOT, RB_GDB, RB_MULTIPLE,
63 RB_MUTE, RB_PAUSE, RB_SERIAL, RB_SINGLE, RB_VERBOSE
67 bi_getboothowto(char *kargs)
76 /* Get the boot options from the environment first. */
77 for (i = 0; howto_names[i].ev != NULL; i++) {
78 if (getenv(howto_names[i].ev) != NULL)
79 howto |= howto_names[i].mask;
82 console = getenv("console");
83 if (console != NULL) {
84 if (strcmp(console, "comconsole") == 0)
86 if (strcmp(console, "nullconsole") == 0)
94 opts = strchr(kargs, '-');
95 while (opts != NULL) {
96 while (*(++opts) != '\0') {
97 sw = strchr(howto_switches, *opts);
100 howto |= howto_masks[sw - howto_switches];
102 opts = strchr(opts, '-');
109 * Copy the environment into the load area starting at (addr).
110 * Each variable is formatted as <name>=<value>, with a single nul
111 * separating each variable, and a double nul terminating the environment.
114 bi_copyenv(vm_offset_t start)
117 vm_offset_t addr, last;
122 /* Traverse the environment. */
123 for (ep = environ; ep != NULL; ep = ep->ev_next) {
124 len = strlen(ep->ev_name);
125 if (archsw.arch_copyin(ep->ev_name, addr, len) != len)
128 if (archsw.arch_copyin("=", addr, 1) != 1)
131 if (ep->ev_value != NULL) {
132 len = strlen(ep->ev_value);
133 if (archsw.arch_copyin(ep->ev_value, addr, len) != len)
137 if (archsw.arch_copyin("", addr, 1) != 1)
142 if (archsw.arch_copyin("", last++, 1) != 1)
148 * Copy module-related data into the load area, where it can be
149 * used as a directory for loaded modules.
151 * Module data is presented in a self-describing format. Each datum
152 * is preceded by a 32-bit identifier and a 32-bit size field.
154 * Currently, the following data are saved:
156 * MOD_NAME (variable) module name (string)
157 * MOD_TYPE (variable) module type (string)
158 * MOD_ARGS (variable) module parameters (string)
159 * MOD_ADDR sizeof(vm_offset_t) module load address
160 * MOD_SIZE sizeof(size_t) module size
161 * MOD_METADATA (variable) type-specific metadata
163 #define COPY32(v, a, c) { \
166 archsw.arch_copyin(&x, a, sizeof(x)); \
170 #define MOD_STR(t, a, s, c) { \
172 COPY32(strlen(s) + 1, a, c); \
174 archsw.arch_copyin(s, a, strlen(s) + 1); \
175 a += roundup(strlen(s) + 1, sizeof(u_long)); \
178 #define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
179 #define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
180 #define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
182 #define MOD_VAR(t, a, s, c) { \
184 COPY32(sizeof(s), a, c); \
186 archsw.arch_copyin(&s, a, sizeof(s)); \
187 a += roundup(sizeof(s), sizeof(u_long)); \
190 #define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
191 #define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
193 #define MOD_METADATA(a, mm, c) { \
194 COPY32(MODINFO_METADATA | mm->md_type, a, c); \
195 COPY32(mm->md_size, a, c); \
197 archsw.arch_copyin(mm->md_data, a, mm->md_size); \
198 a += roundup(mm->md_size, sizeof(u_long)); \
201 #define MOD_END(a, c) { \
202 COPY32(MODINFO_END, a, c); \
207 bi_copymodules(vm_offset_t addr)
209 struct preloaded_file *fp;
210 struct file_metadata *md;
215 /* Start with the first module on the list, should be the kernel. */
216 for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
217 MOD_NAME(addr, fp->f_name, c); /* This must come first. */
218 MOD_TYPE(addr, fp->f_type, c);
220 MOD_ARGS(addr, fp->f_args, c);
223 v -= __elfN(relocation_offset);
225 MOD_ADDR(addr, v, c);
227 MOD_SIZE(addr, v, c);
228 for (md = fp->f_metadata; md != NULL; md = md->md_next)
229 if (!(md->md_type & MODINFOMD_NOCOPY))
230 MOD_METADATA(addr, md, c);
237 bi_load_efi_data(struct preloaded_file *kfp)
239 EFI_MEMORY_DESCRIPTOR *mm;
240 EFI_PHYSICAL_ADDRESS addr;
243 UINTN mmsz, pages, sz;
245 struct efi_map_header *efihdr;
247 #if defined(__amd64__)
250 if (efi_find_framebuffer(&efifb) == 0) {
251 printf("EFI framebuffer information:\n");
252 printf("addr, size 0x%lx, 0x%lx\n", efifb.fb_addr,
254 printf("dimensions %d x %d\n", efifb.fb_width,
256 printf("stride %d\n", efifb.fb_stride);
257 printf("masks 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",
258 efifb.fb_mask_red, efifb.fb_mask_green, efifb.fb_mask_blue,
259 efifb.fb_mask_reserved);
261 file_addmetadata(kfp, MODINFOMD_EFI_FB, sizeof(efifb), &efifb);
265 efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
268 * Allocate enough pages to hold the bootinfo block and the memory
269 * map EFI will return to us. The memory map has an unknown size,
270 * so we have to determine that first. Note that the AllocatePages
271 * call can itself modify the memory map, so we have to take that
272 * into account as well. The changes to the memory map are caused
273 * by splitting a range of free memory into two (AFAICT), so that
274 * one is marked as being loader data.
277 BS->GetMemoryMap(&sz, NULL, &efi_mapkey, &mmsz, &mmver);
279 sz = (sz + 0xf) & ~0xf;
280 pages = EFI_SIZE_TO_PAGES(sz + efisz);
281 status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData, pages,
283 if (EFI_ERROR(status)) {
284 printf("%s: AllocatePages() returned 0x%lx\n", __func__,
290 * Read the memory map and stash it after bootinfo. Align the
291 * memory map on a 16-byte boundary (the bootinfo block is page
294 efihdr = (struct efi_map_header *)addr;
295 mm = (void *)((uint8_t *)efihdr + efisz);
296 sz = (EFI_PAGE_SIZE * pages) - efisz;
297 status = BS->GetMemoryMap(&sz, mm, &efi_mapkey, &mmsz, &mmver);
298 if (EFI_ERROR(status)) {
299 printf("%s: GetMemoryMap() returned 0x%lx\n", __func__,
304 efihdr->memory_size = sz;
305 efihdr->descriptor_size = mmsz;
306 efihdr->descriptor_version = mmver;
308 file_addmetadata(kfp, MODINFOMD_EFI_MAP, efisz + sz, efihdr);
314 * Load the information expected by an amd64 kernel.
316 * - The 'boothowto' argument is constructed.
317 * - The 'bootdev' argument is constructed.
318 * - The 'bootinfo' struct is constructed, and copied into the kernel space.
319 * - The kernel environment is copied into kernel space.
320 * - Module metadata are formatted and placed in kernel space.
323 bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp)
325 struct preloaded_file *xp, *kfp;
326 struct devdesc *rootdev;
327 struct file_metadata *md;
334 #if defined(LOADER_FDT_SUPPORT)
342 * These metadata addreses must be converted for kernel after
346 MODINFOMD_SSYM, MODINFOMD_ESYM, MODINFOMD_KERNEND,
348 #if defined(LOADER_FDT_SUPPORT)
354 howto = bi_getboothowto(args);
357 * Allow the environment variable 'rootdev' to override the supplied
358 * device. This should perhaps go to MI code and/or have $rootdev
359 * tested/set by MI code before launching the kernel.
361 rootdevname = getenv("rootdev");
362 archsw.arch_getdev((void**)(&rootdev), rootdevname, NULL);
363 if (rootdev == NULL) {
364 printf("Can't determine root device.\n");
368 /* Try reading the /etc/fstab file to select the root device */
369 getrootmount(efi_fmtdev((void *)rootdev));
372 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
373 if (addr < (xp->f_addr + xp->f_size))
374 addr = xp->f_addr + xp->f_size;
377 /* Pad to a page boundary. */
378 addr = roundup(addr, PAGE_SIZE);
380 /* Copy our environment. */
382 addr = bi_copyenv(addr);
384 /* Pad to a page boundary. */
385 addr = roundup(addr, PAGE_SIZE);
387 #if defined(LOADER_FDT_SUPPORT)
388 /* Handle device tree blob */
390 dtb_size = fdt_copy(addr);
392 /* Pad to a page boundary */
394 addr += roundup(dtb_size, PAGE_SIZE);
397 kfp = file_findfile(NULL, "elf kernel");
399 kfp = file_findfile(NULL, "elf64 kernel");
401 panic("can't find kernel file");
402 kernend = 0; /* fill it in later */
403 file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
404 file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
405 #if defined(LOADER_FDT_SUPPORT)
407 file_addmetadata(kfp, MODINFOMD_DTBP, sizeof dtbp, &dtbp);
409 pager_output("WARNING! Trying to fire up the kernel, but no "
410 "device tree blob found!\n");
412 file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
414 bi_load_efi_data(kfp);
416 /* Figure out the size and location of the metadata. */
418 size = bi_copymodules(0);
419 kernend = roundup(addr + size, PAGE_SIZE);
422 /* patch MODINFOMD_KERNEND */
423 md = file_findmetadata(kfp, MODINFOMD_KERNEND);
424 bcopy(&kernend, md->md_data, sizeof kernend);
427 *modulep -= __elfN(relocation_offset);
429 /* Do relocation fixup on metadata of each module. */
430 for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
431 for (i = 0; i < sizeof mdt / sizeof mdt[0]; i++) {
432 md = file_findmetadata(xp, mdt[i]);
434 bcopy(md->md_data, &vaddr, sizeof vaddr);
435 vaddr -= __elfN(relocation_offset);
436 bcopy(&vaddr, md->md_data, sizeof vaddr);
442 /* Copy module list and metadata. */
443 (void)bi_copymodules(addr);