1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Kexec bzImage loader
4 *
5 * Copyright (C) 2014 Red Hat Inc.
6 * Authors:
7 * Vivek Goyal <vgoyal@redhat.com>
8 */
9
10 #define pr_fmt(fmt) "kexec-bzImage64: " fmt
11
12 #include <linux/string.h>
13 #include <linux/printk.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/kexec.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/efi.h>
20 #include <linux/random.h>
21
22 #include <asm/bootparam.h>
23 #include <asm/setup.h>
24 #include <asm/crash.h>
25 #include <asm/efi.h>
26 #include <asm/e820/api.h>
27 #include <asm/kexec-bzimage64.h>
28
29 #define MAX_ELFCOREHDR_STR_LEN 30 /* elfcorehdr=0x<64bit-value> */
30 #define MAX_DMCRYPTKEYS_STR_LEN 31 /* dmcryptkeys=0x<64bit-value> */
31
32
33 /*
34 * Defines lowest physical address for various segments. Not sure where
35 * exactly these limits came from. Current bzimage64 loader in kexec-tools
36 * uses these so I am retaining it. It can be changed over time as we gain
37 * more insight.
38 */
39 #define MIN_PURGATORY_ADDR 0x3000
40 #define MIN_BOOTPARAM_ADDR 0x3000
41 #define MIN_KERNEL_LOAD_ADDR 0x100000
42 #define MIN_INITRD_LOAD_ADDR 0x1000000
43
44 /*
45 * This is a place holder for all boot loader specific data structure which
46 * gets allocated in one call but gets freed much later during cleanup
47 * time. Right now there is only one field but it can grow as need be.
48 */
49 struct bzimage64_data {
50 /*
51 * Temporary buffer to hold bootparams buffer. This should be
52 * freed once the bootparam segment has been loaded.
53 */
54 void *bootparams_buf;
55 };
56
setup_initrd(struct boot_params * params,unsigned long initrd_load_addr,unsigned long initrd_len)57 static int setup_initrd(struct boot_params *params,
58 unsigned long initrd_load_addr, unsigned long initrd_len)
59 {
60 params->hdr.ramdisk_image = initrd_load_addr & 0xffffffffUL;
61 params->hdr.ramdisk_size = initrd_len & 0xffffffffUL;
62
63 params->ext_ramdisk_image = initrd_load_addr >> 32;
64 params->ext_ramdisk_size = initrd_len >> 32;
65
66 return 0;
67 }
68
setup_cmdline(struct kimage * image,struct boot_params * params,unsigned long bootparams_load_addr,unsigned long cmdline_offset,char * cmdline,unsigned long cmdline_len)69 static int setup_cmdline(struct kimage *image, struct boot_params *params,
70 unsigned long bootparams_load_addr,
71 unsigned long cmdline_offset, char *cmdline,
72 unsigned long cmdline_len)
73 {
74 char *cmdline_ptr = ((char *)params) + cmdline_offset;
75 unsigned long cmdline_ptr_phys, len = 0;
76 uint32_t cmdline_low_32, cmdline_ext_32;
77
78 if (image->type == KEXEC_TYPE_CRASH) {
79 len = sprintf(cmdline_ptr,
80 "elfcorehdr=0x%lx ", image->elf_load_addr);
81
82 if (image->dm_crypt_keys_addr != 0)
83 len += sprintf(cmdline_ptr + len,
84 "dmcryptkeys=0x%lx ", image->dm_crypt_keys_addr);
85 }
86 memcpy(cmdline_ptr + len, cmdline, cmdline_len);
87 cmdline_len += len;
88
89 cmdline_ptr[cmdline_len - 1] = '\0';
90
91 kexec_dprintk("Final command line is: %s\n", cmdline_ptr);
92 cmdline_ptr_phys = bootparams_load_addr + cmdline_offset;
93 cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL;
94 cmdline_ext_32 = cmdline_ptr_phys >> 32;
95
96 params->hdr.cmd_line_ptr = cmdline_low_32;
97 if (cmdline_ext_32)
98 params->ext_cmd_line_ptr = cmdline_ext_32;
99
100 return 0;
101 }
102
setup_e820_entries(struct boot_params * params)103 static int setup_e820_entries(struct boot_params *params)
104 {
105 unsigned int nr_e820_entries;
106
107 nr_e820_entries = e820_table_kexec->nr_entries;
108
109 /* TODO: Pass entries more than E820_MAX_ENTRIES_ZEROPAGE in bootparams setup data */
110 if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE)
111 nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE;
112
113 params->e820_entries = nr_e820_entries;
114 memcpy(¶ms->e820_table, &e820_table_kexec->entries, nr_e820_entries*sizeof(struct e820_entry));
115
116 return 0;
117 }
118
119 enum { RNG_SEED_LENGTH = 32 };
120
121 static void
setup_rng_seed(struct boot_params * params,unsigned long params_load_addr,unsigned int rng_seed_setup_data_offset)122 setup_rng_seed(struct boot_params *params, unsigned long params_load_addr,
123 unsigned int rng_seed_setup_data_offset)
124 {
125 struct setup_data *sd = (void *)params + rng_seed_setup_data_offset;
126 unsigned long setup_data_phys;
127
128 if (!rng_is_initialized())
129 return;
130
131 sd->type = SETUP_RNG_SEED;
132 sd->len = RNG_SEED_LENGTH;
133 get_random_bytes(sd->data, RNG_SEED_LENGTH);
134 setup_data_phys = params_load_addr + rng_seed_setup_data_offset;
135 sd->next = params->hdr.setup_data;
136 params->hdr.setup_data = setup_data_phys;
137 }
138
139 #ifdef CONFIG_EFI
setup_efi_info_memmap(struct boot_params * params,unsigned long params_load_addr,unsigned int efi_map_offset,unsigned int efi_map_sz)140 static int setup_efi_info_memmap(struct boot_params *params,
141 unsigned long params_load_addr,
142 unsigned int efi_map_offset,
143 unsigned int efi_map_sz)
144 {
145 void *efi_map = (void *)params + efi_map_offset;
146 unsigned long efi_map_phys_addr = params_load_addr + efi_map_offset;
147 struct efi_info *ei = ¶ms->efi_info;
148
149 if (!efi_map_sz)
150 return 0;
151
152 efi_runtime_map_copy(efi_map, efi_map_sz);
153
154 ei->efi_memmap = efi_map_phys_addr & 0xffffffff;
155 ei->efi_memmap_hi = efi_map_phys_addr >> 32;
156 ei->efi_memmap_size = efi_map_sz;
157
158 return 0;
159 }
160
161 static int
prepare_add_efi_setup_data(struct boot_params * params,unsigned long params_load_addr,unsigned int efi_setup_data_offset)162 prepare_add_efi_setup_data(struct boot_params *params,
163 unsigned long params_load_addr,
164 unsigned int efi_setup_data_offset)
165 {
166 unsigned long setup_data_phys;
167 struct setup_data *sd = (void *)params + efi_setup_data_offset;
168 struct efi_setup_data *esd = (void *)sd + sizeof(struct setup_data);
169
170 esd->fw_vendor = efi_fw_vendor;
171 esd->tables = efi_config_table;
172 esd->smbios = efi.smbios;
173
174 sd->type = SETUP_EFI;
175 sd->len = sizeof(struct efi_setup_data);
176
177 /* Add setup data */
178 setup_data_phys = params_load_addr + efi_setup_data_offset;
179 sd->next = params->hdr.setup_data;
180 params->hdr.setup_data = setup_data_phys;
181
182 return 0;
183 }
184
185 static int
setup_efi_state(struct boot_params * params,unsigned long params_load_addr,unsigned int efi_map_offset,unsigned int efi_map_sz,unsigned int efi_setup_data_offset)186 setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
187 unsigned int efi_map_offset, unsigned int efi_map_sz,
188 unsigned int efi_setup_data_offset)
189 {
190 struct efi_info *current_ei = &boot_params.efi_info;
191 struct efi_info *ei = ¶ms->efi_info;
192
193 if (!efi_enabled(EFI_RUNTIME_SERVICES))
194 return 0;
195
196 if (!current_ei->efi_memmap_size)
197 return 0;
198
199 params->secure_boot = boot_params.secure_boot;
200 ei->efi_loader_signature = current_ei->efi_loader_signature;
201 ei->efi_systab = current_ei->efi_systab;
202 ei->efi_systab_hi = current_ei->efi_systab_hi;
203
204 ei->efi_memdesc_version = current_ei->efi_memdesc_version;
205 ei->efi_memdesc_size = efi_get_runtime_map_desc_size();
206
207 setup_efi_info_memmap(params, params_load_addr, efi_map_offset,
208 efi_map_sz);
209 prepare_add_efi_setup_data(params, params_load_addr,
210 efi_setup_data_offset);
211 return 0;
212 }
213 #endif /* CONFIG_EFI */
214
215 static void
setup_ima_state(const struct kimage * image,struct boot_params * params,unsigned long params_load_addr,unsigned int ima_setup_data_offset)216 setup_ima_state(const struct kimage *image, struct boot_params *params,
217 unsigned long params_load_addr,
218 unsigned int ima_setup_data_offset)
219 {
220 #ifdef CONFIG_IMA_KEXEC
221 struct setup_data *sd = (void *)params + ima_setup_data_offset;
222 unsigned long setup_data_phys;
223 struct ima_setup_data *ima;
224
225 if (!image->ima_buffer_size)
226 return;
227
228 sd->type = SETUP_IMA;
229 sd->len = sizeof(*ima);
230
231 ima = (void *)sd + sizeof(struct setup_data);
232 ima->addr = image->ima_buffer_addr;
233 ima->size = image->ima_buffer_size;
234
235 /* Add setup data */
236 setup_data_phys = params_load_addr + ima_setup_data_offset;
237 sd->next = params->hdr.setup_data;
238 params->hdr.setup_data = setup_data_phys;
239 #endif /* CONFIG_IMA_KEXEC */
240 }
241
setup_kho(const struct kimage * image,struct boot_params * params,unsigned long params_load_addr,unsigned int setup_data_offset)242 static void setup_kho(const struct kimage *image, struct boot_params *params,
243 unsigned long params_load_addr,
244 unsigned int setup_data_offset)
245 {
246 struct setup_data *sd = (void *)params + setup_data_offset;
247 struct kho_data *kho = (void *)sd + sizeof(*sd);
248
249 if (!IS_ENABLED(CONFIG_KEXEC_HANDOVER))
250 return;
251
252 sd->type = SETUP_KEXEC_KHO;
253 sd->len = sizeof(struct kho_data);
254
255 /* Only add if we have all KHO images in place */
256 if (!image->kho.fdt || !image->kho.scratch)
257 return;
258
259 /* Add setup data */
260 kho->fdt_addr = image->kho.fdt;
261 kho->fdt_size = PAGE_SIZE;
262 kho->scratch_addr = image->kho.scratch->mem;
263 kho->scratch_size = image->kho.scratch->bufsz;
264 sd->next = params->hdr.setup_data;
265 params->hdr.setup_data = params_load_addr + setup_data_offset;
266 }
267
268 static int
setup_boot_parameters(struct kimage * image,struct boot_params * params,unsigned long params_load_addr,unsigned int efi_map_offset,unsigned int efi_map_sz,unsigned int setup_data_offset)269 setup_boot_parameters(struct kimage *image, struct boot_params *params,
270 unsigned long params_load_addr,
271 unsigned int efi_map_offset, unsigned int efi_map_sz,
272 unsigned int setup_data_offset)
273 {
274 unsigned int nr_e820_entries;
275 unsigned long long mem_k, start, end;
276 int i, ret = 0;
277
278 /* Get subarch from existing bootparams */
279 params->hdr.hardware_subarch = boot_params.hdr.hardware_subarch;
280
281 /* Copying screen_info will do? */
282 memcpy(¶ms->screen_info, &screen_info, sizeof(struct screen_info));
283
284 /* Fill in memsize later */
285 params->screen_info.ext_mem_k = 0;
286 params->alt_mem_k = 0;
287
288 /* Always fill in RSDP: it is either 0 or a valid value */
289 params->acpi_rsdp_addr = boot_params.acpi_rsdp_addr;
290
291 /* Default APM info */
292 memset(¶ms->apm_bios_info, 0, sizeof(params->apm_bios_info));
293
294 /* Default drive info */
295 memset(¶ms->hd0_info, 0, sizeof(params->hd0_info));
296 memset(¶ms->hd1_info, 0, sizeof(params->hd1_info));
297
298 #ifdef CONFIG_CRASH_DUMP
299 if (image->type == KEXEC_TYPE_CRASH) {
300 ret = crash_setup_memmap_entries(image, params);
301 if (ret)
302 return ret;
303 } else
304 #endif
305 setup_e820_entries(params);
306
307 nr_e820_entries = params->e820_entries;
308
309 kexec_dprintk("E820 memmap:\n");
310 for (i = 0; i < nr_e820_entries; i++) {
311 kexec_dprintk("%016llx-%016llx (%d)\n",
312 params->e820_table[i].addr,
313 params->e820_table[i].addr + params->e820_table[i].size - 1,
314 params->e820_table[i].type);
315 if (params->e820_table[i].type != E820_TYPE_RAM)
316 continue;
317 start = params->e820_table[i].addr;
318 end = params->e820_table[i].addr + params->e820_table[i].size - 1;
319
320 if ((start <= 0x100000) && end > 0x100000) {
321 mem_k = (end >> 10) - (0x100000 >> 10);
322 params->screen_info.ext_mem_k = mem_k;
323 params->alt_mem_k = mem_k;
324 if (mem_k > 0xfc00)
325 params->screen_info.ext_mem_k = 0xfc00; /* 64M*/
326 if (mem_k > 0xffffffff)
327 params->alt_mem_k = 0xffffffff;
328 }
329 }
330
331 #ifdef CONFIG_EFI
332 /* Setup EFI state */
333 setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz,
334 setup_data_offset);
335 setup_data_offset += sizeof(struct setup_data) +
336 sizeof(struct efi_setup_data);
337 #endif
338
339 if (IS_ENABLED(CONFIG_IMA_KEXEC)) {
340 /* Setup IMA log buffer state */
341 setup_ima_state(image, params, params_load_addr,
342 setup_data_offset);
343 setup_data_offset += sizeof(struct setup_data) +
344 sizeof(struct ima_setup_data);
345 }
346
347 if (IS_ENABLED(CONFIG_KEXEC_HANDOVER)) {
348 /* Setup space to store preservation metadata */
349 setup_kho(image, params, params_load_addr, setup_data_offset);
350 setup_data_offset += sizeof(struct setup_data) +
351 sizeof(struct kho_data);
352 }
353
354 /* Setup RNG seed */
355 setup_rng_seed(params, params_load_addr, setup_data_offset);
356
357 /* Setup EDD info */
358 memcpy(params->eddbuf, boot_params.eddbuf,
359 EDDMAXNR * sizeof(struct edd_info));
360 params->eddbuf_entries = boot_params.eddbuf_entries;
361
362 memcpy(params->edd_mbr_sig_buffer, boot_params.edd_mbr_sig_buffer,
363 EDD_MBR_SIG_MAX * sizeof(unsigned int));
364
365 return ret;
366 }
367
bzImage64_probe(const char * buf,unsigned long len)368 static int bzImage64_probe(const char *buf, unsigned long len)
369 {
370 int ret = -ENOEXEC;
371 struct setup_header *header;
372
373 /* kernel should be at least two sectors long */
374 if (len < 2 * 512) {
375 pr_err("File is too short to be a bzImage\n");
376 return ret;
377 }
378
379 header = (struct setup_header *)(buf + offsetof(struct boot_params, hdr));
380 if (memcmp((char *)&header->header, "HdrS", 4) != 0) {
381 pr_err("Not a bzImage\n");
382 return ret;
383 }
384
385 if (header->boot_flag != 0xAA55) {
386 pr_err("No x86 boot sector present\n");
387 return ret;
388 }
389
390 if (header->version < 0x020C) {
391 pr_err("Must be at least protocol version 2.12\n");
392 return ret;
393 }
394
395 if (!(header->loadflags & LOADED_HIGH)) {
396 pr_err("zImage not a bzImage\n");
397 return ret;
398 }
399
400 if (!(header->xloadflags & XLF_KERNEL_64)) {
401 pr_err("Not a bzImage64. XLF_KERNEL_64 is not set.\n");
402 return ret;
403 }
404
405 if (!(header->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)) {
406 pr_err("XLF_CAN_BE_LOADED_ABOVE_4G is not set.\n");
407 return ret;
408 }
409
410 /*
411 * Can't handle 32bit EFI as it does not allow loading kernel
412 * above 4G. This should be handled by 32bit bzImage loader
413 */
414 if (efi_enabled(EFI_RUNTIME_SERVICES) && !efi_enabled(EFI_64BIT)) {
415 pr_debug("EFI is 32 bit. Can't load kernel above 4G.\n");
416 return ret;
417 }
418
419 if (!(header->xloadflags & XLF_5LEVEL) && pgtable_l5_enabled()) {
420 pr_err("bzImage cannot handle 5-level paging mode.\n");
421 return ret;
422 }
423
424 /* I've got a bzImage */
425 pr_debug("It's a relocatable bzImage64\n");
426 ret = 0;
427
428 return ret;
429 }
430
bzImage64_load(struct kimage * image,char * kernel,unsigned long kernel_len,char * initrd,unsigned long initrd_len,char * cmdline,unsigned long cmdline_len)431 static void *bzImage64_load(struct kimage *image, char *kernel,
432 unsigned long kernel_len, char *initrd,
433 unsigned long initrd_len, char *cmdline,
434 unsigned long cmdline_len)
435 {
436
437 struct setup_header *header;
438 int setup_sects, kern16_size, ret = 0;
439 unsigned long setup_header_size, params_cmdline_sz;
440 struct boot_params *params;
441 unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr;
442 struct bzimage64_data *ldata;
443 struct kexec_entry64_regs regs64;
444 void *stack;
445 unsigned int setup_hdr_offset = offsetof(struct boot_params, hdr);
446 unsigned int efi_map_offset, efi_map_sz, efi_setup_data_offset;
447 struct kexec_buf kbuf = { .image = image, .buf_max = ULONG_MAX,
448 .top_down = true };
449 struct kexec_buf pbuf = { .image = image, .buf_min = MIN_PURGATORY_ADDR,
450 .buf_max = ULONG_MAX, .top_down = true };
451
452 header = (struct setup_header *)(kernel + setup_hdr_offset);
453 setup_sects = header->setup_sects;
454 if (setup_sects == 0)
455 setup_sects = 4;
456
457 kern16_size = (setup_sects + 1) * 512;
458 if (kernel_len < kern16_size) {
459 pr_err("bzImage truncated\n");
460 return ERR_PTR(-ENOEXEC);
461 }
462
463 if (cmdline_len > header->cmdline_size) {
464 pr_err("Kernel command line too long\n");
465 return ERR_PTR(-EINVAL);
466 }
467
468 /*
469 * In case of crash dump, we will append elfcorehdr=<addr> to
470 * command line. Make sure it does not overflow
471 */
472 if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
473 pr_err("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
474 return ERR_PTR(-EINVAL);
475 }
476
477 #ifdef CONFIG_CRASH_DUMP
478 /* Allocate and load backup region */
479 if (image->type == KEXEC_TYPE_CRASH) {
480 ret = crash_load_segments(image);
481 if (ret)
482 return ERR_PTR(ret);
483 ret = crash_load_dm_crypt_keys(image);
484 if (ret == -ENOENT) {
485 kexec_dprintk("No dm crypt key to load\n");
486 } else if (ret) {
487 pr_err("Failed to load dm crypt keys\n");
488 return ERR_PTR(ret);
489 }
490 if (image->dm_crypt_keys_addr &&
491 cmdline_len + MAX_ELFCOREHDR_STR_LEN + MAX_DMCRYPTKEYS_STR_LEN >
492 header->cmdline_size) {
493 pr_err("Appending dmcryptkeys=<addr> to command line exceeds maximum allowed length\n");
494 return ERR_PTR(-EINVAL);
495 }
496 }
497 #endif
498
499 /*
500 * Load purgatory. For 64bit entry point, purgatory code can be
501 * anywhere.
502 */
503 ret = kexec_load_purgatory(image, &pbuf);
504 if (ret) {
505 pr_err("Loading purgatory failed\n");
506 return ERR_PTR(ret);
507 }
508
509 kexec_dprintk("Loaded purgatory at 0x%lx\n", pbuf.mem);
510
511
512 /*
513 * Load Bootparams and cmdline and space for efi stuff.
514 *
515 * Allocate memory together for multiple data structures so
516 * that they all can go in single area/segment and we don't
517 * have to create separate segment for each. Keeps things
518 * little bit simple
519 */
520 efi_map_sz = efi_get_runtime_map_size();
521 params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
522 MAX_ELFCOREHDR_STR_LEN;
523 if (image->dm_crypt_keys_addr)
524 params_cmdline_sz += MAX_DMCRYPTKEYS_STR_LEN;
525 params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
526 kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) +
527 sizeof(struct setup_data) +
528 sizeof(struct efi_setup_data) +
529 sizeof(struct setup_data) +
530 RNG_SEED_LENGTH;
531
532 if (IS_ENABLED(CONFIG_IMA_KEXEC))
533 kbuf.bufsz += sizeof(struct setup_data) +
534 sizeof(struct ima_setup_data);
535
536 if (IS_ENABLED(CONFIG_KEXEC_HANDOVER))
537 kbuf.bufsz += sizeof(struct setup_data) +
538 sizeof(struct kho_data);
539
540 params = kzalloc(kbuf.bufsz, GFP_KERNEL);
541 if (!params)
542 return ERR_PTR(-ENOMEM);
543 efi_map_offset = params_cmdline_sz;
544 efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16);
545
546 /* Copy setup header onto bootparams. Documentation/arch/x86/boot.rst */
547 setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;
548
549 /* Is there a limit on setup header size? */
550 memcpy(¶ms->hdr, (kernel + setup_hdr_offset), setup_header_size);
551
552 kbuf.buffer = params;
553 kbuf.memsz = kbuf.bufsz;
554 kbuf.buf_align = 16;
555 kbuf.buf_min = MIN_BOOTPARAM_ADDR;
556 ret = kexec_add_buffer(&kbuf);
557 if (ret)
558 goto out_free_params;
559 bootparam_load_addr = kbuf.mem;
560 kexec_dprintk("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
561 bootparam_load_addr, kbuf.bufsz, kbuf.memsz);
562
563 /* Load kernel */
564 kbuf.buffer = kernel + kern16_size;
565 kbuf.bufsz = kernel_len - kern16_size;
566 kbuf.memsz = PAGE_ALIGN(header->init_size);
567 kbuf.buf_align = header->kernel_alignment;
568 if (header->pref_address < MIN_KERNEL_LOAD_ADDR)
569 kbuf.buf_min = MIN_KERNEL_LOAD_ADDR;
570 else
571 kbuf.buf_min = header->pref_address;
572 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
573 ret = kexec_add_buffer(&kbuf);
574 if (ret)
575 goto out_free_params;
576 kernel_load_addr = kbuf.mem;
577
578 kexec_dprintk("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
579 kernel_load_addr, kbuf.bufsz, kbuf.memsz);
580
581 /* Load initrd high */
582 if (initrd) {
583 kbuf.buffer = initrd;
584 kbuf.bufsz = kbuf.memsz = initrd_len;
585 kbuf.buf_align = PAGE_SIZE;
586 kbuf.buf_min = MIN_INITRD_LOAD_ADDR;
587 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
588 ret = kexec_add_buffer(&kbuf);
589 if (ret)
590 goto out_free_params;
591 initrd_load_addr = kbuf.mem;
592
593 kexec_dprintk("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
594 initrd_load_addr, initrd_len, initrd_len);
595
596 setup_initrd(params, initrd_load_addr, initrd_len);
597 }
598
599 setup_cmdline(image, params, bootparam_load_addr,
600 sizeof(struct boot_params), cmdline, cmdline_len);
601
602 /* bootloader info. Do we need a separate ID for kexec kernel loader? */
603 params->hdr.type_of_loader = 0x0D << 4;
604 params->hdr.loadflags = 0;
605
606 /* Setup purgatory regs for entry */
607 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64,
608 sizeof(regs64), 1);
609 if (ret)
610 goto out_free_params;
611
612 regs64.rbx = 0; /* Bootstrap Processor */
613 regs64.rsi = bootparam_load_addr;
614 regs64.rip = kernel_load_addr + 0x200;
615 stack = kexec_purgatory_get_symbol_addr(image, "stack_end");
616 if (IS_ERR(stack)) {
617 pr_err("Could not find address of symbol stack_end\n");
618 ret = -EINVAL;
619 goto out_free_params;
620 }
621
622 regs64.rsp = (unsigned long)stack;
623 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64,
624 sizeof(regs64), 0);
625 if (ret)
626 goto out_free_params;
627
628 ret = setup_boot_parameters(image, params, bootparam_load_addr,
629 efi_map_offset, efi_map_sz,
630 efi_setup_data_offset);
631 if (ret)
632 goto out_free_params;
633
634 /* Allocate loader specific data */
635 ldata = kzalloc(sizeof(struct bzimage64_data), GFP_KERNEL);
636 if (!ldata) {
637 ret = -ENOMEM;
638 goto out_free_params;
639 }
640
641 /*
642 * Store pointer to params so that it could be freed after loading
643 * params segment has been loaded and contents have been copied
644 * somewhere else.
645 */
646 ldata->bootparams_buf = params;
647 return ldata;
648
649 out_free_params:
650 kfree(params);
651 return ERR_PTR(ret);
652 }
653
654 /* This cleanup function is called after various segments have been loaded */
bzImage64_cleanup(void * loader_data)655 static int bzImage64_cleanup(void *loader_data)
656 {
657 struct bzimage64_data *ldata = loader_data;
658
659 if (!ldata)
660 return 0;
661
662 kfree(ldata->bootparams_buf);
663 ldata->bootparams_buf = NULL;
664
665 return 0;
666 }
667
668 const struct kexec_file_ops kexec_bzImage64_ops = {
669 .probe = bzImage64_probe,
670 .load = bzImage64_load,
671 .cleanup = bzImage64_cleanup,
672 #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
673 .verify_sig = kexec_kernel_verify_pe_sig,
674 #endif
675 };
676