1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 1995 Linus Torvalds |
4 | * |
5 | * This file contains the setup_arch() code, which handles the architecture-dependent |
6 | * parts of early kernel initialization. |
7 | */ |
8 | #include <linux/acpi.h> |
9 | #include <linux/console.h> |
10 | #include <linux/crash_dump.h> |
11 | #include <linux/dma-map-ops.h> |
12 | #include <linux/dmi.h> |
13 | #include <linux/efi.h> |
14 | #include <linux/ima.h> |
15 | #include <linux/init_ohci1394_dma.h> |
16 | #include <linux/initrd.h> |
17 | #include <linux/iscsi_ibft.h> |
18 | #include <linux/memblock.h> |
19 | #include <linux/panic_notifier.h> |
20 | #include <linux/pci.h> |
21 | #include <linux/root_dev.h> |
22 | #include <linux/hugetlb.h> |
23 | #include <linux/tboot.h> |
24 | #include <linux/usb/xhci-dbgp.h> |
25 | #include <linux/static_call.h> |
26 | #include <linux/swiotlb.h> |
27 | #include <linux/random.h> |
28 | |
29 | #include <uapi/linux/mount.h> |
30 | |
31 | #include <xen/xen.h> |
32 | |
33 | #include <asm/apic.h> |
34 | #include <asm/efi.h> |
35 | #include <asm/numa.h> |
36 | #include <asm/bios_ebda.h> |
37 | #include <asm/bugs.h> |
38 | #include <asm/cacheinfo.h> |
39 | #include <asm/cpu.h> |
40 | #include <asm/efi.h> |
41 | #include <asm/gart.h> |
42 | #include <asm/hypervisor.h> |
43 | #include <asm/io_apic.h> |
44 | #include <asm/kasan.h> |
45 | #include <asm/kaslr.h> |
46 | #include <asm/mce.h> |
47 | #include <asm/memtype.h> |
48 | #include <asm/mtrr.h> |
49 | #include <asm/realmode.h> |
50 | #include <asm/olpc_ofw.h> |
51 | #include <asm/pci-direct.h> |
52 | #include <asm/prom.h> |
53 | #include <asm/proto.h> |
54 | #include <asm/thermal.h> |
55 | #include <asm/unwind.h> |
56 | #include <asm/vsyscall.h> |
57 | #include <linux/vmalloc.h> |
58 | |
59 | /* |
60 | * max_low_pfn_mapped: highest directly mapped pfn < 4 GB |
61 | * max_pfn_mapped: highest directly mapped pfn > 4 GB |
62 | * |
63 | * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are |
64 | * represented by pfn_mapped[]. |
65 | */ |
66 | unsigned long max_low_pfn_mapped; |
67 | unsigned long max_pfn_mapped; |
68 | |
69 | #ifdef CONFIG_DMI |
70 | RESERVE_BRK(dmi_alloc, 65536); |
71 | #endif |
72 | |
73 | |
74 | unsigned long _brk_start = (unsigned long)__brk_base; |
75 | unsigned long _brk_end = (unsigned long)__brk_base; |
76 | |
77 | struct boot_params boot_params; |
78 | |
79 | /* |
80 | * These are the four main kernel memory regions, we put them into |
81 | * the resource tree so that kdump tools and other debugging tools |
82 | * recover it: |
83 | */ |
84 | |
85 | static struct resource rodata_resource = { |
86 | .name = "Kernel rodata" , |
87 | .start = 0, |
88 | .end = 0, |
89 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM |
90 | }; |
91 | |
92 | static struct resource data_resource = { |
93 | .name = "Kernel data" , |
94 | .start = 0, |
95 | .end = 0, |
96 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM |
97 | }; |
98 | |
99 | static struct resource code_resource = { |
100 | .name = "Kernel code" , |
101 | .start = 0, |
102 | .end = 0, |
103 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM |
104 | }; |
105 | |
106 | static struct resource bss_resource = { |
107 | .name = "Kernel bss" , |
108 | .start = 0, |
109 | .end = 0, |
110 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM |
111 | }; |
112 | |
113 | |
114 | #ifdef CONFIG_X86_32 |
115 | /* CPU data as detected by the assembly code in head_32.S */ |
116 | struct cpuinfo_x86 new_cpu_data; |
117 | |
118 | struct apm_info apm_info; |
119 | EXPORT_SYMBOL(apm_info); |
120 | |
121 | #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \ |
122 | defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE) |
123 | struct ist_info ist_info; |
124 | EXPORT_SYMBOL(ist_info); |
125 | #else |
126 | struct ist_info ist_info; |
127 | #endif |
128 | |
129 | #endif |
130 | |
131 | struct cpuinfo_x86 boot_cpu_data __read_mostly; |
132 | EXPORT_SYMBOL(boot_cpu_data); |
133 | |
134 | #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64) |
135 | __visible unsigned long mmu_cr4_features __ro_after_init; |
136 | #else |
137 | __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE; |
138 | #endif |
139 | |
140 | #ifdef CONFIG_IMA |
141 | static phys_addr_t ima_kexec_buffer_phys; |
142 | static size_t ima_kexec_buffer_size; |
143 | #endif |
144 | |
145 | /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ |
146 | int bootloader_type, bootloader_version; |
147 | |
148 | /* |
149 | * Setup options |
150 | */ |
151 | struct screen_info screen_info; |
152 | EXPORT_SYMBOL(screen_info); |
153 | struct edid_info edid_info; |
154 | EXPORT_SYMBOL_GPL(edid_info); |
155 | |
156 | extern int root_mountflags; |
157 | |
158 | unsigned long saved_video_mode; |
159 | |
160 | #define RAMDISK_IMAGE_START_MASK 0x07FF |
161 | #define RAMDISK_PROMPT_FLAG 0x8000 |
162 | #define RAMDISK_LOAD_FLAG 0x4000 |
163 | |
164 | static char __initdata command_line[COMMAND_LINE_SIZE]; |
165 | #ifdef CONFIG_CMDLINE_BOOL |
166 | static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; |
167 | #endif |
168 | |
169 | #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE) |
170 | struct edd edd; |
171 | #ifdef CONFIG_EDD_MODULE |
172 | EXPORT_SYMBOL(edd); |
173 | #endif |
174 | /** |
175 | * copy_edd() - Copy the BIOS EDD information |
176 | * from boot_params into a safe place. |
177 | * |
178 | */ |
179 | static inline void __init copy_edd(void) |
180 | { |
181 | memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer, |
182 | sizeof(edd.mbr_signature)); |
183 | memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info)); |
184 | edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries; |
185 | edd.edd_info_nr = boot_params.eddbuf_entries; |
186 | } |
187 | #else |
188 | static inline void __init copy_edd(void) |
189 | { |
190 | } |
191 | #endif |
192 | |
193 | void * __init extend_brk(size_t size, size_t align) |
194 | { |
195 | size_t mask = align - 1; |
196 | void *ret; |
197 | |
198 | BUG_ON(_brk_start == 0); |
199 | BUG_ON(align & mask); |
200 | |
201 | _brk_end = (_brk_end + mask) & ~mask; |
202 | BUG_ON((char *)(_brk_end + size) > __brk_limit); |
203 | |
204 | ret = (void *)_brk_end; |
205 | _brk_end += size; |
206 | |
207 | memset(ret, 0, size); |
208 | |
209 | return ret; |
210 | } |
211 | |
212 | #ifdef CONFIG_X86_32 |
213 | static void __init cleanup_highmap(void) |
214 | { |
215 | } |
216 | #endif |
217 | |
218 | static void __init reserve_brk(void) |
219 | { |
220 | if (_brk_end > _brk_start) |
221 | memblock_reserve(__pa_symbol(_brk_start), |
222 | size: _brk_end - _brk_start); |
223 | |
224 | /* Mark brk area as locked down and no longer taking any |
225 | new allocations */ |
226 | _brk_start = 0; |
227 | } |
228 | |
229 | u64 relocated_ramdisk; |
230 | |
231 | #ifdef CONFIG_BLK_DEV_INITRD |
232 | |
233 | static u64 __init get_ramdisk_image(void) |
234 | { |
235 | u64 ramdisk_image = boot_params.hdr.ramdisk_image; |
236 | |
237 | ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32; |
238 | |
239 | if (ramdisk_image == 0) |
240 | ramdisk_image = phys_initrd_start; |
241 | |
242 | return ramdisk_image; |
243 | } |
244 | static u64 __init get_ramdisk_size(void) |
245 | { |
246 | u64 ramdisk_size = boot_params.hdr.ramdisk_size; |
247 | |
248 | ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32; |
249 | |
250 | if (ramdisk_size == 0) |
251 | ramdisk_size = phys_initrd_size; |
252 | |
253 | return ramdisk_size; |
254 | } |
255 | |
256 | static void __init relocate_initrd(void) |
257 | { |
258 | /* Assume only end is not page aligned */ |
259 | u64 ramdisk_image = get_ramdisk_image(); |
260 | u64 ramdisk_size = get_ramdisk_size(); |
261 | u64 area_size = PAGE_ALIGN(ramdisk_size); |
262 | |
263 | /* We need to move the initrd down into directly mapped mem */ |
264 | relocated_ramdisk = memblock_phys_alloc_range(size: area_size, PAGE_SIZE, start: 0, |
265 | PFN_PHYS(max_pfn_mapped)); |
266 | if (!relocated_ramdisk) |
267 | panic(fmt: "Cannot find place for new RAMDISK of size %lld\n" , |
268 | ramdisk_size); |
269 | |
270 | initrd_start = relocated_ramdisk + PAGE_OFFSET; |
271 | initrd_end = initrd_start + ramdisk_size; |
272 | printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n" , |
273 | relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); |
274 | |
275 | copy_from_early_mem(dest: (void *)initrd_start, src: ramdisk_image, size: ramdisk_size); |
276 | |
277 | printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to" |
278 | " [mem %#010llx-%#010llx]\n" , |
279 | ramdisk_image, ramdisk_image + ramdisk_size - 1, |
280 | relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1); |
281 | } |
282 | |
283 | static void __init early_reserve_initrd(void) |
284 | { |
285 | /* Assume only end is not page aligned */ |
286 | u64 ramdisk_image = get_ramdisk_image(); |
287 | u64 ramdisk_size = get_ramdisk_size(); |
288 | u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); |
289 | |
290 | if (!boot_params.hdr.type_of_loader || |
291 | !ramdisk_image || !ramdisk_size) |
292 | return; /* No initrd provided by bootloader */ |
293 | |
294 | memblock_reserve(base: ramdisk_image, size: ramdisk_end - ramdisk_image); |
295 | } |
296 | |
297 | static void __init reserve_initrd(void) |
298 | { |
299 | /* Assume only end is not page aligned */ |
300 | u64 ramdisk_image = get_ramdisk_image(); |
301 | u64 ramdisk_size = get_ramdisk_size(); |
302 | u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); |
303 | |
304 | if (!boot_params.hdr.type_of_loader || |
305 | !ramdisk_image || !ramdisk_size) |
306 | return; /* No initrd provided by bootloader */ |
307 | |
308 | initrd_start = 0; |
309 | |
310 | printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n" , ramdisk_image, |
311 | ramdisk_end - 1); |
312 | |
313 | if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image), |
314 | PFN_DOWN(ramdisk_end))) { |
315 | /* All are mapped, easy case */ |
316 | initrd_start = ramdisk_image + PAGE_OFFSET; |
317 | initrd_end = initrd_start + ramdisk_size; |
318 | return; |
319 | } |
320 | |
321 | relocate_initrd(); |
322 | |
323 | memblock_phys_free(base: ramdisk_image, size: ramdisk_end - ramdisk_image); |
324 | } |
325 | |
326 | #else |
327 | static void __init early_reserve_initrd(void) |
328 | { |
329 | } |
330 | static void __init reserve_initrd(void) |
331 | { |
332 | } |
333 | #endif /* CONFIG_BLK_DEV_INITRD */ |
334 | |
335 | static void __init add_early_ima_buffer(u64 phys_addr) |
336 | { |
337 | #ifdef CONFIG_IMA |
338 | struct ima_setup_data *data; |
339 | |
340 | data = early_memremap(phys_addr: phys_addr + sizeof(struct setup_data), size: sizeof(*data)); |
341 | if (!data) { |
342 | pr_warn("setup: failed to memremap ima_setup_data entry\n" ); |
343 | return; |
344 | } |
345 | |
346 | if (data->size) { |
347 | memblock_reserve(base: data->addr, size: data->size); |
348 | ima_kexec_buffer_phys = data->addr; |
349 | ima_kexec_buffer_size = data->size; |
350 | } |
351 | |
352 | early_memunmap(addr: data, size: sizeof(*data)); |
353 | #else |
354 | pr_warn("Passed IMA kexec data, but CONFIG_IMA not set. Ignoring.\n" ); |
355 | #endif |
356 | } |
357 | |
358 | #if defined(CONFIG_HAVE_IMA_KEXEC) && !defined(CONFIG_OF_FLATTREE) |
359 | int __init ima_free_kexec_buffer(void) |
360 | { |
361 | if (!ima_kexec_buffer_size) |
362 | return -ENOENT; |
363 | |
364 | memblock_free_late(ima_kexec_buffer_phys, |
365 | ima_kexec_buffer_size); |
366 | |
367 | ima_kexec_buffer_phys = 0; |
368 | ima_kexec_buffer_size = 0; |
369 | |
370 | return 0; |
371 | } |
372 | |
373 | int __init ima_get_kexec_buffer(void **addr, size_t *size) |
374 | { |
375 | if (!ima_kexec_buffer_size) |
376 | return -ENOENT; |
377 | |
378 | *addr = __va(ima_kexec_buffer_phys); |
379 | *size = ima_kexec_buffer_size; |
380 | |
381 | return 0; |
382 | } |
383 | #endif |
384 | |
385 | static void __init parse_setup_data(void) |
386 | { |
387 | struct setup_data *data; |
388 | u64 pa_data, pa_next; |
389 | |
390 | pa_data = boot_params.hdr.setup_data; |
391 | while (pa_data) { |
392 | u32 data_len, data_type; |
393 | |
394 | data = early_memremap(phys_addr: pa_data, size: sizeof(*data)); |
395 | data_len = data->len + sizeof(struct setup_data); |
396 | data_type = data->type; |
397 | pa_next = data->next; |
398 | early_memunmap(addr: data, size: sizeof(*data)); |
399 | |
400 | switch (data_type) { |
401 | case SETUP_E820_EXT: |
402 | e820__memory_setup_extended(phys_addr: pa_data, data_len); |
403 | break; |
404 | case SETUP_DTB: |
405 | add_dtb(data: pa_data); |
406 | break; |
407 | case SETUP_EFI: |
408 | parse_efi_setup(phys_addr: pa_data, data_len); |
409 | break; |
410 | case SETUP_IMA: |
411 | add_early_ima_buffer(phys_addr: pa_data); |
412 | break; |
413 | case SETUP_RNG_SEED: |
414 | data = early_memremap(phys_addr: pa_data, size: data_len); |
415 | add_bootloader_randomness(buf: data->data, len: data->len); |
416 | /* Zero seed for forward secrecy. */ |
417 | memzero_explicit(s: data->data, count: data->len); |
418 | /* Zero length in case we find ourselves back here by accident. */ |
419 | memzero_explicit(s: &data->len, count: sizeof(data->len)); |
420 | early_memunmap(addr: data, size: data_len); |
421 | break; |
422 | default: |
423 | break; |
424 | } |
425 | pa_data = pa_next; |
426 | } |
427 | } |
428 | |
429 | static void __init memblock_x86_reserve_range_setup_data(void) |
430 | { |
431 | struct setup_indirect *indirect; |
432 | struct setup_data *data; |
433 | u64 pa_data, pa_next; |
434 | u32 len; |
435 | |
436 | pa_data = boot_params.hdr.setup_data; |
437 | while (pa_data) { |
438 | data = early_memremap(phys_addr: pa_data, size: sizeof(*data)); |
439 | if (!data) { |
440 | pr_warn("setup: failed to memremap setup_data entry\n" ); |
441 | return; |
442 | } |
443 | |
444 | len = sizeof(*data); |
445 | pa_next = data->next; |
446 | |
447 | memblock_reserve(base: pa_data, size: sizeof(*data) + data->len); |
448 | |
449 | if (data->type == SETUP_INDIRECT) { |
450 | len += data->len; |
451 | early_memunmap(addr: data, size: sizeof(*data)); |
452 | data = early_memremap(phys_addr: pa_data, size: len); |
453 | if (!data) { |
454 | pr_warn("setup: failed to memremap indirect setup_data\n" ); |
455 | return; |
456 | } |
457 | |
458 | indirect = (struct setup_indirect *)data->data; |
459 | |
460 | if (indirect->type != SETUP_INDIRECT) |
461 | memblock_reserve(base: indirect->addr, size: indirect->len); |
462 | } |
463 | |
464 | pa_data = pa_next; |
465 | early_memunmap(addr: data, size: len); |
466 | } |
467 | } |
468 | |
469 | static void __init arch_reserve_crashkernel(void) |
470 | { |
471 | unsigned long long crash_base, crash_size, low_size = 0; |
472 | char *cmdline = boot_command_line; |
473 | bool high = false; |
474 | int ret; |
475 | |
476 | if (!IS_ENABLED(CONFIG_KEXEC_CORE)) |
477 | return; |
478 | |
479 | ret = parse_crashkernel(cmdline, system_ram: memblock_phys_mem_size(), |
480 | crash_size: &crash_size, crash_base: &crash_base, |
481 | low_size: &low_size, high: &high); |
482 | if (ret) |
483 | return; |
484 | |
485 | if (xen_pv_domain()) { |
486 | pr_info("Ignoring crashkernel for a Xen PV domain\n" ); |
487 | return; |
488 | } |
489 | |
490 | reserve_crashkernel_generic(cmdline, crash_size, crash_base, |
491 | crash_low_size: low_size, high); |
492 | } |
493 | |
494 | static struct resource standard_io_resources[] = { |
495 | { .name = "dma1" , .start = 0x00, .end = 0x1f, |
496 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
497 | { .name = "pic1" , .start = 0x20, .end = 0x21, |
498 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
499 | { .name = "timer0" , .start = 0x40, .end = 0x43, |
500 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
501 | { .name = "timer1" , .start = 0x50, .end = 0x53, |
502 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
503 | { .name = "keyboard" , .start = 0x60, .end = 0x60, |
504 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
505 | { .name = "keyboard" , .start = 0x64, .end = 0x64, |
506 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
507 | { .name = "dma page reg" , .start = 0x80, .end = 0x8f, |
508 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
509 | { .name = "pic2" , .start = 0xa0, .end = 0xa1, |
510 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
511 | { .name = "dma2" , .start = 0xc0, .end = 0xdf, |
512 | .flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
513 | { .name = "fpu" , .start = 0xf0, .end = 0xff, |
514 | .flags = IORESOURCE_BUSY | IORESOURCE_IO } |
515 | }; |
516 | |
517 | void __init reserve_standard_io_resources(void) |
518 | { |
519 | int i; |
520 | |
521 | /* request I/O space for devices used on all i[345]86 PCs */ |
522 | for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++) |
523 | request_resource(root: &ioport_resource, new: &standard_io_resources[i]); |
524 | |
525 | } |
526 | |
527 | static bool __init snb_gfx_workaround_needed(void) |
528 | { |
529 | #ifdef CONFIG_PCI |
530 | int i; |
531 | u16 vendor, devid; |
532 | static const __initconst u16 snb_ids[] = { |
533 | 0x0102, |
534 | 0x0112, |
535 | 0x0122, |
536 | 0x0106, |
537 | 0x0116, |
538 | 0x0126, |
539 | 0x010a, |
540 | }; |
541 | |
542 | /* Assume no if something weird is going on with PCI */ |
543 | if (!early_pci_allowed()) |
544 | return false; |
545 | |
546 | vendor = read_pci_config_16(bus: 0, slot: 2, func: 0, PCI_VENDOR_ID); |
547 | if (vendor != 0x8086) |
548 | return false; |
549 | |
550 | devid = read_pci_config_16(bus: 0, slot: 2, func: 0, PCI_DEVICE_ID); |
551 | for (i = 0; i < ARRAY_SIZE(snb_ids); i++) |
552 | if (devid == snb_ids[i]) |
553 | return true; |
554 | #endif |
555 | |
556 | return false; |
557 | } |
558 | |
559 | /* |
560 | * Sandy Bridge graphics has trouble with certain ranges, exclude |
561 | * them from allocation. |
562 | */ |
563 | static void __init trim_snb_memory(void) |
564 | { |
565 | static const __initconst unsigned long bad_pages[] = { |
566 | 0x20050000, |
567 | 0x20110000, |
568 | 0x20130000, |
569 | 0x20138000, |
570 | 0x40004000, |
571 | }; |
572 | int i; |
573 | |
574 | if (!snb_gfx_workaround_needed()) |
575 | return; |
576 | |
577 | printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n" ); |
578 | |
579 | /* |
580 | * SandyBridge integrated graphics devices have a bug that prevents |
581 | * them from accessing certain memory ranges, namely anything below |
582 | * 1M and in the pages listed in bad_pages[] above. |
583 | * |
584 | * To avoid these pages being ever accessed by SNB gfx devices reserve |
585 | * bad_pages that have not already been reserved at boot time. |
586 | * All memory below the 1 MB mark is anyway reserved later during |
587 | * setup_arch(), so there is no need to reserve it here. |
588 | */ |
589 | |
590 | for (i = 0; i < ARRAY_SIZE(bad_pages); i++) { |
591 | if (memblock_reserve(base: bad_pages[i], PAGE_SIZE)) |
592 | printk(KERN_WARNING "failed to reserve 0x%08lx\n" , |
593 | bad_pages[i]); |
594 | } |
595 | } |
596 | |
597 | static void __init trim_bios_range(void) |
598 | { |
599 | /* |
600 | * A special case is the first 4Kb of memory; |
601 | * This is a BIOS owned area, not kernel ram, but generally |
602 | * not listed as such in the E820 table. |
603 | * |
604 | * This typically reserves additional memory (64KiB by default) |
605 | * since some BIOSes are known to corrupt low memory. See the |
606 | * Kconfig help text for X86_RESERVE_LOW. |
607 | */ |
608 | e820__range_update(start: 0, PAGE_SIZE, old_type: E820_TYPE_RAM, new_type: E820_TYPE_RESERVED); |
609 | |
610 | /* |
611 | * special case: Some BIOSes report the PC BIOS |
612 | * area (640Kb -> 1Mb) as RAM even though it is not. |
613 | * take them out. |
614 | */ |
615 | e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, old_type: E820_TYPE_RAM, check_type: 1); |
616 | |
617 | e820__update_table(table: e820_table); |
618 | } |
619 | |
620 | /* called before trim_bios_range() to spare extra sanitize */ |
621 | static void __init e820_add_kernel_range(void) |
622 | { |
623 | u64 start = __pa_symbol(_text); |
624 | u64 size = __pa_symbol(_end) - start; |
625 | |
626 | /* |
627 | * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and |
628 | * attempt to fix it by adding the range. We may have a confused BIOS, |
629 | * or the user may have used memmap=exactmap or memmap=xxM$yyM to |
630 | * exclude kernel range. If we really are running on top non-RAM, |
631 | * we will crash later anyways. |
632 | */ |
633 | if (e820__mapped_all(start, end: start + size, type: E820_TYPE_RAM)) |
634 | return; |
635 | |
636 | pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n" ); |
637 | e820__range_remove(start, size, old_type: E820_TYPE_RAM, check_type: 0); |
638 | e820__range_add(start, size, type: E820_TYPE_RAM); |
639 | } |
640 | |
641 | static void __init early_reserve_memory(void) |
642 | { |
643 | /* |
644 | * Reserve the memory occupied by the kernel between _text and |
645 | * __end_of_kernel_reserve symbols. Any kernel sections after the |
646 | * __end_of_kernel_reserve symbol must be explicitly reserved with a |
647 | * separate memblock_reserve() or they will be discarded. |
648 | */ |
649 | memblock_reserve(__pa_symbol(_text), |
650 | size: (unsigned long)__end_of_kernel_reserve - (unsigned long)_text); |
651 | |
652 | /* |
653 | * The first 4Kb of memory is a BIOS owned area, but generally it is |
654 | * not listed as such in the E820 table. |
655 | * |
656 | * Reserve the first 64K of memory since some BIOSes are known to |
657 | * corrupt low memory. After the real mode trampoline is allocated the |
658 | * rest of the memory below 640k is reserved. |
659 | * |
660 | * In addition, make sure page 0 is always reserved because on |
661 | * systems with L1TF its contents can be leaked to user processes. |
662 | */ |
663 | memblock_reserve(base: 0, SZ_64K); |
664 | |
665 | early_reserve_initrd(); |
666 | |
667 | memblock_x86_reserve_range_setup_data(); |
668 | |
669 | reserve_bios_regions(); |
670 | trim_snb_memory(); |
671 | } |
672 | |
673 | /* |
674 | * Dump out kernel offset information on panic. |
675 | */ |
676 | static int |
677 | dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p) |
678 | { |
679 | if (kaslr_enabled()) { |
680 | pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n" , |
681 | kaslr_offset(), |
682 | __START_KERNEL, |
683 | __START_KERNEL_map, |
684 | MODULES_VADDR-1); |
685 | } else { |
686 | pr_emerg("Kernel Offset: disabled\n" ); |
687 | } |
688 | |
689 | return 0; |
690 | } |
691 | |
692 | void x86_configure_nx(void) |
693 | { |
694 | if (boot_cpu_has(X86_FEATURE_NX)) |
695 | __supported_pte_mask |= _PAGE_NX; |
696 | else |
697 | __supported_pte_mask &= ~_PAGE_NX; |
698 | } |
699 | |
700 | static void __init x86_report_nx(void) |
701 | { |
702 | if (!boot_cpu_has(X86_FEATURE_NX)) { |
703 | printk(KERN_NOTICE "Notice: NX (Execute Disable) protection " |
704 | "missing in CPU!\n" ); |
705 | } else { |
706 | #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) |
707 | printk(KERN_INFO "NX (Execute Disable) protection: active\n" ); |
708 | #else |
709 | /* 32bit non-PAE kernel, NX cannot be used */ |
710 | printk(KERN_NOTICE "Notice: NX (Execute Disable) protection " |
711 | "cannot be enabled: non-PAE kernel!\n" ); |
712 | #endif |
713 | } |
714 | } |
715 | |
716 | /* |
717 | * Determine if we were loaded by an EFI loader. If so, then we have also been |
718 | * passed the efi memmap, systab, etc., so we should use these data structures |
719 | * for initialization. Note, the efi init code path is determined by the |
720 | * global efi_enabled. This allows the same kernel image to be used on existing |
721 | * systems (with a traditional BIOS) as well as on EFI systems. |
722 | */ |
723 | /* |
724 | * setup_arch - architecture-specific boot-time initializations |
725 | * |
726 | * Note: On x86_64, fixmaps are ready for use even before this is called. |
727 | */ |
728 | |
729 | void __init setup_arch(char **cmdline_p) |
730 | { |
731 | #ifdef CONFIG_X86_32 |
732 | memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data)); |
733 | |
734 | /* |
735 | * copy kernel address range established so far and switch |
736 | * to the proper swapper page table |
737 | */ |
738 | clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY, |
739 | initial_page_table + KERNEL_PGD_BOUNDARY, |
740 | KERNEL_PGD_PTRS); |
741 | |
742 | load_cr3(swapper_pg_dir); |
743 | /* |
744 | * Note: Quark X1000 CPUs advertise PGE incorrectly and require |
745 | * a cr3 based tlb flush, so the following __flush_tlb_all() |
746 | * will not flush anything because the CPU quirk which clears |
747 | * X86_FEATURE_PGE has not been invoked yet. Though due to the |
748 | * load_cr3() above the TLB has been flushed already. The |
749 | * quirk is invoked before subsequent calls to __flush_tlb_all() |
750 | * so proper operation is guaranteed. |
751 | */ |
752 | __flush_tlb_all(); |
753 | #else |
754 | printk(KERN_INFO "Command line: %s\n" , boot_command_line); |
755 | boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS; |
756 | #endif |
757 | |
758 | /* |
759 | * If we have OLPC OFW, we might end up relocating the fixmap due to |
760 | * reserve_top(), so do this before touching the ioremap area. |
761 | */ |
762 | olpc_ofw_detect(); |
763 | |
764 | idt_setup_early_traps(); |
765 | early_cpu_init(); |
766 | jump_label_init(); |
767 | static_call_init(); |
768 | early_ioremap_init(); |
769 | |
770 | setup_olpc_ofw_pgd(); |
771 | |
772 | ROOT_DEV = old_decode_dev(val: boot_params.hdr.root_dev); |
773 | screen_info = boot_params.screen_info; |
774 | edid_info = boot_params.edid_info; |
775 | #ifdef CONFIG_X86_32 |
776 | apm_info.bios = boot_params.apm_bios_info; |
777 | ist_info = boot_params.ist_info; |
778 | #endif |
779 | saved_video_mode = boot_params.hdr.vid_mode; |
780 | bootloader_type = boot_params.hdr.type_of_loader; |
781 | if ((bootloader_type >> 4) == 0xe) { |
782 | bootloader_type &= 0xf; |
783 | bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4; |
784 | } |
785 | bootloader_version = bootloader_type & 0xf; |
786 | bootloader_version |= boot_params.hdr.ext_loader_ver << 4; |
787 | |
788 | #ifdef CONFIG_BLK_DEV_RAM |
789 | rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK; |
790 | #endif |
791 | #ifdef CONFIG_EFI |
792 | if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, |
793 | EFI32_LOADER_SIGNATURE, 4)) { |
794 | set_bit(EFI_BOOT, addr: &efi.flags); |
795 | } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature, |
796 | EFI64_LOADER_SIGNATURE, 4)) { |
797 | set_bit(EFI_BOOT, addr: &efi.flags); |
798 | set_bit(EFI_64BIT, addr: &efi.flags); |
799 | } |
800 | #endif |
801 | |
802 | x86_init.oem.arch_setup(); |
803 | |
804 | /* |
805 | * Do some memory reservations *before* memory is added to memblock, so |
806 | * memblock allocations won't overwrite it. |
807 | * |
808 | * After this point, everything still needed from the boot loader or |
809 | * firmware or kernel text should be early reserved or marked not RAM in |
810 | * e820. All other memory is free game. |
811 | * |
812 | * This call needs to happen before e820__memory_setup() which calls the |
813 | * xen_memory_setup() on Xen dom0 which relies on the fact that those |
814 | * early reservations have happened already. |
815 | */ |
816 | early_reserve_memory(); |
817 | |
818 | iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; |
819 | e820__memory_setup(); |
820 | parse_setup_data(); |
821 | |
822 | copy_edd(); |
823 | |
824 | if (!boot_params.hdr.root_flags) |
825 | root_mountflags &= ~MS_RDONLY; |
826 | setup_initial_init_mm(start_code: _text, end_code: _etext, end_data: _edata, brk: (void *)_brk_end); |
827 | |
828 | code_resource.start = __pa_symbol(_text); |
829 | code_resource.end = __pa_symbol(_etext)-1; |
830 | rodata_resource.start = __pa_symbol(__start_rodata); |
831 | rodata_resource.end = __pa_symbol(__end_rodata)-1; |
832 | data_resource.start = __pa_symbol(_sdata); |
833 | data_resource.end = __pa_symbol(_edata)-1; |
834 | bss_resource.start = __pa_symbol(__bss_start); |
835 | bss_resource.end = __pa_symbol(__bss_stop)-1; |
836 | |
837 | #ifdef CONFIG_CMDLINE_BOOL |
838 | #ifdef CONFIG_CMDLINE_OVERRIDE |
839 | strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); |
840 | #else |
841 | if (builtin_cmdline[0]) { |
842 | /* append boot loader cmdline to builtin */ |
843 | strlcat(p: builtin_cmdline, q: " " , COMMAND_LINE_SIZE); |
844 | strlcat(p: builtin_cmdline, q: boot_command_line, COMMAND_LINE_SIZE); |
845 | strscpy(p: boot_command_line, q: builtin_cmdline, COMMAND_LINE_SIZE); |
846 | } |
847 | #endif |
848 | #endif |
849 | |
850 | strscpy(p: command_line, q: boot_command_line, COMMAND_LINE_SIZE); |
851 | *cmdline_p = command_line; |
852 | |
853 | /* |
854 | * x86_configure_nx() is called before parse_early_param() to detect |
855 | * whether hardware doesn't support NX (so that the early EHCI debug |
856 | * console setup can safely call set_fixmap()). |
857 | */ |
858 | x86_configure_nx(); |
859 | |
860 | parse_early_param(); |
861 | |
862 | if (efi_enabled(EFI_BOOT)) |
863 | efi_memblock_x86_reserve_range(); |
864 | |
865 | #ifdef CONFIG_MEMORY_HOTPLUG |
866 | /* |
867 | * Memory used by the kernel cannot be hot-removed because Linux |
868 | * cannot migrate the kernel pages. When memory hotplug is |
869 | * enabled, we should prevent memblock from allocating memory |
870 | * for the kernel. |
871 | * |
872 | * ACPI SRAT records all hotpluggable memory ranges. But before |
873 | * SRAT is parsed, we don't know about it. |
874 | * |
875 | * The kernel image is loaded into memory at very early time. We |
876 | * cannot prevent this anyway. So on NUMA system, we set any |
877 | * node the kernel resides in as un-hotpluggable. |
878 | * |
879 | * Since on modern servers, one node could have double-digit |
880 | * gigabytes memory, we can assume the memory around the kernel |
881 | * image is also un-hotpluggable. So before SRAT is parsed, just |
882 | * allocate memory near the kernel image to try the best to keep |
883 | * the kernel away from hotpluggable memory. |
884 | */ |
885 | if (movable_node_is_enabled()) |
886 | memblock_set_bottom_up(enable: true); |
887 | #endif |
888 | |
889 | x86_report_nx(); |
890 | |
891 | apic_setup_apic_calls(); |
892 | |
893 | if (acpi_mps_check()) { |
894 | #ifdef CONFIG_X86_LOCAL_APIC |
895 | apic_is_disabled = true; |
896 | #endif |
897 | setup_clear_cpu_cap(X86_FEATURE_APIC); |
898 | } |
899 | |
900 | e820__reserve_setup_data(); |
901 | e820__finish_early_params(); |
902 | |
903 | if (efi_enabled(EFI_BOOT)) |
904 | efi_init(); |
905 | |
906 | reserve_ibft_region(); |
907 | dmi_setup(); |
908 | |
909 | /* |
910 | * VMware detection requires dmi to be available, so this |
911 | * needs to be done after dmi_setup(), for the boot CPU. |
912 | * For some guest types (Xen PV, SEV-SNP, TDX) it is required to be |
913 | * called before cache_bp_init() for setting up MTRR state. |
914 | */ |
915 | init_hypervisor_platform(); |
916 | |
917 | tsc_early_init(); |
918 | x86_init.resources.probe_roms(); |
919 | |
920 | /* after parse_early_param, so could debug it */ |
921 | insert_resource(parent: &iomem_resource, new: &code_resource); |
922 | insert_resource(parent: &iomem_resource, new: &rodata_resource); |
923 | insert_resource(parent: &iomem_resource, new: &data_resource); |
924 | insert_resource(parent: &iomem_resource, new: &bss_resource); |
925 | |
926 | e820_add_kernel_range(); |
927 | trim_bios_range(); |
928 | #ifdef CONFIG_X86_32 |
929 | if (ppro_with_ram_bug()) { |
930 | e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM, |
931 | E820_TYPE_RESERVED); |
932 | e820__update_table(e820_table); |
933 | printk(KERN_INFO "fixed physical RAM map:\n" ); |
934 | e820__print_table("bad_ppro" ); |
935 | } |
936 | #else |
937 | early_gart_iommu_check(); |
938 | #endif |
939 | |
940 | /* |
941 | * partially used pages are not usable - thus |
942 | * we are rounding upwards: |
943 | */ |
944 | max_pfn = e820__end_of_ram_pfn(); |
945 | |
946 | /* update e820 for memory not covered by WB MTRRs */ |
947 | cache_bp_init(); |
948 | if (mtrr_trim_uncached_memory(end_pfn: max_pfn)) |
949 | max_pfn = e820__end_of_ram_pfn(); |
950 | |
951 | max_possible_pfn = max_pfn; |
952 | |
953 | /* |
954 | * Define random base addresses for memory sections after max_pfn is |
955 | * defined and before each memory section base is used. |
956 | */ |
957 | kernel_randomize_memory(); |
958 | |
959 | #ifdef CONFIG_X86_32 |
960 | /* max_low_pfn get updated here */ |
961 | find_low_pfn_range(); |
962 | #else |
963 | check_x2apic(); |
964 | |
965 | /* How many end-of-memory variables you have, grandma! */ |
966 | /* need this before calling reserve_initrd */ |
967 | if (max_pfn > (1UL<<(32 - PAGE_SHIFT))) |
968 | max_low_pfn = e820__end_of_low_ram_pfn(); |
969 | else |
970 | max_low_pfn = max_pfn; |
971 | |
972 | high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; |
973 | #endif |
974 | |
975 | /* |
976 | * Find and reserve possible boot-time SMP configuration: |
977 | */ |
978 | find_smp_config(); |
979 | |
980 | early_alloc_pgt_buf(); |
981 | |
982 | /* |
983 | * Need to conclude brk, before e820__memblock_setup() |
984 | * it could use memblock_find_in_range, could overlap with |
985 | * brk area. |
986 | */ |
987 | reserve_brk(); |
988 | |
989 | cleanup_highmap(); |
990 | |
991 | memblock_set_current_limit(ISA_END_ADDRESS); |
992 | e820__memblock_setup(); |
993 | |
994 | /* |
995 | * Needs to run after memblock setup because it needs the physical |
996 | * memory size. |
997 | */ |
998 | mem_encrypt_setup_arch(); |
999 | |
1000 | efi_fake_memmap(); |
1001 | efi_find_mirror(); |
1002 | efi_esrt_init(); |
1003 | efi_mokvar_table_init(); |
1004 | |
1005 | /* |
1006 | * The EFI specification says that boot service code won't be |
1007 | * called after ExitBootServices(). This is, in fact, a lie. |
1008 | */ |
1009 | efi_reserve_boot_services(); |
1010 | |
1011 | /* preallocate 4k for mptable mpc */ |
1012 | e820__memblock_alloc_reserved_mpc_new(); |
1013 | |
1014 | #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION |
1015 | setup_bios_corruption_check(); |
1016 | #endif |
1017 | |
1018 | #ifdef CONFIG_X86_32 |
1019 | printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n" , |
1020 | (max_pfn_mapped<<PAGE_SHIFT) - 1); |
1021 | #endif |
1022 | |
1023 | /* |
1024 | * Find free memory for the real mode trampoline and place it there. If |
1025 | * there is not enough free memory under 1M, on EFI-enabled systems |
1026 | * there will be additional attempt to reclaim the memory for the real |
1027 | * mode trampoline at efi_free_boot_services(). |
1028 | * |
1029 | * Unconditionally reserve the entire first 1M of RAM because BIOSes |
1030 | * are known to corrupt low memory and several hundred kilobytes are not |
1031 | * worth complex detection what memory gets clobbered. Windows does the |
1032 | * same thing for very similar reasons. |
1033 | * |
1034 | * Moreover, on machines with SandyBridge graphics or in setups that use |
1035 | * crashkernel the entire 1M is reserved anyway. |
1036 | */ |
1037 | x86_platform.realmode_reserve(); |
1038 | |
1039 | init_mem_mapping(); |
1040 | |
1041 | idt_setup_early_pf(); |
1042 | |
1043 | /* |
1044 | * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features) |
1045 | * with the current CR4 value. This may not be necessary, but |
1046 | * auditing all the early-boot CR4 manipulation would be needed to |
1047 | * rule it out. |
1048 | * |
1049 | * Mask off features that don't work outside long mode (just |
1050 | * PCIDE for now). |
1051 | */ |
1052 | mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE; |
1053 | |
1054 | memblock_set_current_limit(limit: get_max_mapped()); |
1055 | |
1056 | /* |
1057 | * NOTE: On x86-32, only from this point on, fixmaps are ready for use. |
1058 | */ |
1059 | |
1060 | #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT |
1061 | if (init_ohci1394_dma_early) |
1062 | init_ohci1394_dma_on_all_controllers(); |
1063 | #endif |
1064 | /* Allocate bigger log buffer */ |
1065 | setup_log_buf(1); |
1066 | |
1067 | if (efi_enabled(EFI_BOOT)) { |
1068 | switch (boot_params.secure_boot) { |
1069 | case efi_secureboot_mode_disabled: |
1070 | pr_info("Secure boot disabled\n" ); |
1071 | break; |
1072 | case efi_secureboot_mode_enabled: |
1073 | pr_info("Secure boot enabled\n" ); |
1074 | break; |
1075 | default: |
1076 | pr_info("Secure boot could not be determined\n" ); |
1077 | break; |
1078 | } |
1079 | } |
1080 | |
1081 | reserve_initrd(); |
1082 | |
1083 | acpi_table_upgrade(); |
1084 | /* Look for ACPI tables and reserve memory occupied by them. */ |
1085 | acpi_boot_table_init(); |
1086 | |
1087 | vsmp_init(); |
1088 | |
1089 | io_delay_init(); |
1090 | |
1091 | early_platform_quirks(); |
1092 | |
1093 | early_acpi_boot_init(); |
1094 | |
1095 | x86_flattree_get_config(); |
1096 | |
1097 | initmem_init(); |
1098 | dma_contiguous_reserve(addr_limit: max_pfn_mapped << PAGE_SHIFT); |
1099 | |
1100 | if (boot_cpu_has(X86_FEATURE_GBPAGES)) |
1101 | hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); |
1102 | |
1103 | /* |
1104 | * Reserve memory for crash kernel after SRAT is parsed so that it |
1105 | * won't consume hotpluggable memory. |
1106 | */ |
1107 | arch_reserve_crashkernel(); |
1108 | |
1109 | memblock_find_dma_reserve(); |
1110 | |
1111 | if (!early_xdbc_setup_hardware()) |
1112 | early_xdbc_register_console(); |
1113 | |
1114 | x86_init.paging.pagetable_init(); |
1115 | |
1116 | kasan_init(); |
1117 | |
1118 | /* |
1119 | * Sync back kernel address range. |
1120 | * |
1121 | * FIXME: Can the later sync in setup_cpu_entry_areas() replace |
1122 | * this call? |
1123 | */ |
1124 | sync_initial_page_table(); |
1125 | |
1126 | tboot_probe(); |
1127 | |
1128 | map_vsyscall(); |
1129 | |
1130 | x86_32_probe_apic(); |
1131 | |
1132 | early_quirks(); |
1133 | |
1134 | /* |
1135 | * Read APIC and some other early information from ACPI tables. |
1136 | */ |
1137 | acpi_boot_init(); |
1138 | x86_dtb_init(); |
1139 | |
1140 | /* |
1141 | * get boot-time SMP configuration: |
1142 | */ |
1143 | get_smp_config(); |
1144 | |
1145 | /* |
1146 | * Systems w/o ACPI and mptables might not have it mapped the local |
1147 | * APIC yet, but prefill_possible_map() might need to access it. |
1148 | */ |
1149 | init_apic_mappings(); |
1150 | |
1151 | prefill_possible_map(); |
1152 | |
1153 | init_cpu_to_node(); |
1154 | init_gi_nodes(); |
1155 | |
1156 | io_apic_init_mappings(); |
1157 | |
1158 | x86_init.hyper.guest_late_init(); |
1159 | |
1160 | e820__reserve_resources(); |
1161 | e820__register_nosave_regions(limit_pfn: max_pfn); |
1162 | |
1163 | x86_init.resources.reserve_resources(); |
1164 | |
1165 | e820__setup_pci_gap(); |
1166 | |
1167 | #ifdef CONFIG_VT |
1168 | #if defined(CONFIG_VGA_CONSOLE) |
1169 | if (!efi_enabled(EFI_BOOT) || (efi_mem_type(phys_addr: 0xa0000) != EFI_CONVENTIONAL_MEMORY)) |
1170 | vgacon_register_screen(si: &screen_info); |
1171 | #endif |
1172 | #endif |
1173 | x86_init.oem.banner(); |
1174 | |
1175 | x86_init.timers.wallclock_init(); |
1176 | |
1177 | /* |
1178 | * This needs to run before setup_local_APIC() which soft-disables the |
1179 | * local APIC temporarily and that masks the thermal LVT interrupt, |
1180 | * leading to softlockups on machines which have configured SMI |
1181 | * interrupt delivery. |
1182 | */ |
1183 | therm_lvt_init(); |
1184 | |
1185 | mcheck_init(); |
1186 | |
1187 | register_refined_jiffies(CLOCK_TICK_RATE); |
1188 | |
1189 | #ifdef CONFIG_EFI |
1190 | if (efi_enabled(EFI_BOOT)) |
1191 | efi_apply_memmap_quirks(); |
1192 | #endif |
1193 | |
1194 | unwind_init(); |
1195 | } |
1196 | |
1197 | #ifdef CONFIG_X86_32 |
1198 | |
1199 | static struct resource video_ram_resource = { |
1200 | .name = "Video RAM area" , |
1201 | .start = 0xa0000, |
1202 | .end = 0xbffff, |
1203 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM |
1204 | }; |
1205 | |
1206 | void __init i386_reserve_resources(void) |
1207 | { |
1208 | request_resource(&iomem_resource, &video_ram_resource); |
1209 | reserve_standard_io_resources(); |
1210 | } |
1211 | |
1212 | #endif /* CONFIG_X86_32 */ |
1213 | |
1214 | static struct notifier_block kernel_offset_notifier = { |
1215 | .notifier_call = dump_kernel_offset |
1216 | }; |
1217 | |
1218 | static int __init register_kernel_offset_dumper(void) |
1219 | { |
1220 | atomic_notifier_chain_register(nh: &panic_notifier_list, |
1221 | nb: &kernel_offset_notifier); |
1222 | return 0; |
1223 | } |
1224 | __initcall(register_kernel_offset_dumper); |
1225 | |