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/efi.h>
13 #include <linux/ima.h>
14 #include <linux/init_ohci1394_dma.h>
15 #include <linux/initrd.h>
16 #include <linux/iscsi_ibft.h>
17 #include <linux/memblock.h>
18 #include <linux/panic_notifier.h>
19 #include <linux/pci.h>
20 #include <linux/root_dev.h>
21 #include <linux/hugetlb.h>
22 #include <linux/tboot.h>
23 #include <linux/usb/xhci-dbgp.h>
24 #include <linux/static_call.h>
25 #include <linux/swiotlb.h>
26 #include <linux/random.h>
27
28 #include <uapi/linux/mount.h>
29
30 #include <xen/xen.h>
31
32 #include <asm/apic.h>
33 #include <asm/efi.h>
34 #include <asm/numa.h>
35 #include <asm/bios_ebda.h>
36 #include <asm/bugs.h>
37 #include <asm/cacheinfo.h>
38 #include <asm/coco.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 */
copy_edd(void)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
copy_edd(void)188 static inline void __init copy_edd(void)
189 {
190 }
191 #endif
192
extend_brk(size_t size,size_t align)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
cleanup_highmap(void)213 static void __init cleanup_highmap(void)
214 {
215 }
216 #endif
217
reserve_brk(void)218 static void __init reserve_brk(void)
219 {
220 if (_brk_end > _brk_start)
221 memblock_reserve(__pa_symbol(_brk_start),
222 _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
get_ramdisk_image(void)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 }
get_ramdisk_size(void)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
relocate_initrd(void)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(area_size, PAGE_SIZE, 0,
265 PFN_PHYS(max_pfn_mapped));
266 if (!relocated_ramdisk)
267 panic("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((void *)initrd_start, ramdisk_image, 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
early_reserve_initrd(void)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(ramdisk_image, ramdisk_end - ramdisk_image);
295 }
296
reserve_initrd(void)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(ramdisk_image, ramdisk_end - ramdisk_image);
324 }
325
326 #else
early_reserve_initrd(void)327 static void __init early_reserve_initrd(void)
328 {
329 }
reserve_initrd(void)330 static void __init reserve_initrd(void)
331 {
332 }
333 #endif /* CONFIG_BLK_DEV_INITRD */
334
add_early_ima_buffer(u64 phys_addr)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 + sizeof(struct setup_data), 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(data->addr, data->size);
348 ima_kexec_buffer_phys = data->addr;
349 ima_kexec_buffer_size = data->size;
350 }
351
352 early_memunmap(data, 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)
ima_free_kexec_buffer(void)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
ima_get_kexec_buffer(void ** addr,size_t * size)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
parse_setup_data(void)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(pa_data, sizeof(*data));
395 data_len = data->len + sizeof(struct setup_data);
396 data_type = data->type;
397 pa_next = data->next;
398 early_memunmap(data, sizeof(*data));
399
400 switch (data_type) {
401 case SETUP_E820_EXT:
402 e820__memory_setup_extended(pa_data, data_len);
403 break;
404 case SETUP_DTB:
405 add_dtb(pa_data);
406 break;
407 case SETUP_EFI:
408 parse_efi_setup(pa_data, data_len);
409 break;
410 case SETUP_IMA:
411 add_early_ima_buffer(pa_data);
412 break;
413 case SETUP_RNG_SEED:
414 data = early_memremap(pa_data, data_len);
415 add_bootloader_randomness(data->data, data->len);
416 /* Zero seed for forward secrecy. */
417 memzero_explicit(data->data, data->len);
418 /* Zero length in case we find ourselves back here by accident. */
419 memzero_explicit(&data->len, sizeof(data->len));
420 early_memunmap(data, data_len);
421 break;
422 default:
423 break;
424 }
425 pa_data = pa_next;
426 }
427 }
428
memblock_x86_reserve_range_setup_data(void)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(pa_data, 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(pa_data, sizeof(*data) + data->len);
448
449 if (data->type == SETUP_INDIRECT) {
450 len += data->len;
451 early_memunmap(data, sizeof(*data));
452 data = early_memremap(pa_data, 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(indirect->addr, indirect->len);
462 }
463
464 pa_data = pa_next;
465 early_memunmap(data, len);
466 }
467 }
468
469 /*
470 * --------- Crashkernel reservation ------------------------------
471 */
472
473 /* 16M alignment for crash kernel regions */
474 #define CRASH_ALIGN SZ_16M
475
476 /*
477 * Keep the crash kernel below this limit.
478 *
479 * Earlier 32-bits kernels would limit the kernel to the low 512 MB range
480 * due to mapping restrictions.
481 *
482 * 64-bit kdump kernels need to be restricted to be under 64 TB, which is
483 * the upper limit of system RAM in 4-level paging mode. Since the kdump
484 * jump could be from 5-level paging to 4-level paging, the jump will fail if
485 * the kernel is put above 64 TB, and during the 1st kernel bootup there's
486 * no good way to detect the paging mode of the target kernel which will be
487 * loaded for dumping.
488 */
489 #ifdef CONFIG_X86_32
490 # define CRASH_ADDR_LOW_MAX SZ_512M
491 # define CRASH_ADDR_HIGH_MAX SZ_512M
492 #else
493 # define CRASH_ADDR_LOW_MAX SZ_4G
494 # define CRASH_ADDR_HIGH_MAX SZ_64T
495 #endif
496
reserve_crashkernel_low(void)497 static int __init reserve_crashkernel_low(void)
498 {
499 #ifdef CONFIG_X86_64
500 unsigned long long base, low_base = 0, low_size = 0;
501 unsigned long low_mem_limit;
502 int ret;
503
504 low_mem_limit = min(memblock_phys_mem_size(), CRASH_ADDR_LOW_MAX);
505
506 /* crashkernel=Y,low */
507 ret = parse_crashkernel_low(boot_command_line, low_mem_limit, &low_size, &base);
508 if (ret) {
509 /*
510 * two parts from kernel/dma/swiotlb.c:
511 * -swiotlb size: user-specified with swiotlb= or default.
512 *
513 * -swiotlb overflow buffer: now hardcoded to 32k. We round it
514 * to 8M for other buffers that may need to stay low too. Also
515 * make sure we allocate enough extra low memory so that we
516 * don't run out of DMA buffers for 32-bit devices.
517 */
518 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
519 } else {
520 /* passed with crashkernel=0,low ? */
521 if (!low_size)
522 return 0;
523 }
524
525 low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
526 if (!low_base) {
527 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
528 (unsigned long)(low_size >> 20));
529 return -ENOMEM;
530 }
531
532 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (low RAM limit: %ldMB)\n",
533 (unsigned long)(low_size >> 20),
534 (unsigned long)(low_base >> 20),
535 (unsigned long)(low_mem_limit >> 20));
536
537 crashk_low_res.start = low_base;
538 crashk_low_res.end = low_base + low_size - 1;
539 insert_resource(&iomem_resource, &crashk_low_res);
540 #endif
541 return 0;
542 }
543
reserve_crashkernel(void)544 static void __init reserve_crashkernel(void)
545 {
546 unsigned long long crash_size, crash_base, total_mem;
547 bool high = false;
548 int ret;
549
550 if (!IS_ENABLED(CONFIG_KEXEC_CORE))
551 return;
552
553 total_mem = memblock_phys_mem_size();
554
555 /* crashkernel=XM */
556 ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
557 if (ret != 0 || crash_size <= 0) {
558 /* crashkernel=X,high */
559 ret = parse_crashkernel_high(boot_command_line, total_mem,
560 &crash_size, &crash_base);
561 if (ret != 0 || crash_size <= 0)
562 return;
563 high = true;
564 }
565
566 if (xen_pv_domain()) {
567 pr_info("Ignoring crashkernel for a Xen PV domain\n");
568 return;
569 }
570
571 /* 0 means: find the address automatically */
572 if (!crash_base) {
573 /*
574 * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
575 * crashkernel=x,high reserves memory over 4G, also allocates
576 * 256M extra low memory for DMA buffers and swiotlb.
577 * But the extra memory is not required for all machines.
578 * So try low memory first and fall back to high memory
579 * unless "crashkernel=size[KMG],high" is specified.
580 */
581 if (!high)
582 crash_base = memblock_phys_alloc_range(crash_size,
583 CRASH_ALIGN, CRASH_ALIGN,
584 CRASH_ADDR_LOW_MAX);
585 if (!crash_base)
586 crash_base = memblock_phys_alloc_range(crash_size,
587 CRASH_ALIGN, CRASH_ALIGN,
588 CRASH_ADDR_HIGH_MAX);
589 if (!crash_base) {
590 pr_info("crashkernel reservation failed - No suitable area found.\n");
591 return;
592 }
593 } else {
594 unsigned long long start;
595
596 start = memblock_phys_alloc_range(crash_size, SZ_1M, crash_base,
597 crash_base + crash_size);
598 if (start != crash_base) {
599 pr_info("crashkernel reservation failed - memory is in use.\n");
600 return;
601 }
602 }
603
604 if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
605 memblock_phys_free(crash_base, crash_size);
606 return;
607 }
608
609 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
610 (unsigned long)(crash_size >> 20),
611 (unsigned long)(crash_base >> 20),
612 (unsigned long)(total_mem >> 20));
613
614 crashk_res.start = crash_base;
615 crashk_res.end = crash_base + crash_size - 1;
616 insert_resource(&iomem_resource, &crashk_res);
617 }
618
619 static struct resource standard_io_resources[] = {
620 { .name = "dma1", .start = 0x00, .end = 0x1f,
621 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
622 { .name = "pic1", .start = 0x20, .end = 0x21,
623 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
624 { .name = "timer0", .start = 0x40, .end = 0x43,
625 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
626 { .name = "timer1", .start = 0x50, .end = 0x53,
627 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
628 { .name = "keyboard", .start = 0x60, .end = 0x60,
629 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
630 { .name = "keyboard", .start = 0x64, .end = 0x64,
631 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
632 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
633 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
634 { .name = "pic2", .start = 0xa0, .end = 0xa1,
635 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
636 { .name = "dma2", .start = 0xc0, .end = 0xdf,
637 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
638 { .name = "fpu", .start = 0xf0, .end = 0xff,
639 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
640 };
641
reserve_standard_io_resources(void)642 void __init reserve_standard_io_resources(void)
643 {
644 int i;
645
646 /* request I/O space for devices used on all i[345]86 PCs */
647 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
648 request_resource(&ioport_resource, &standard_io_resources[i]);
649
650 }
651
snb_gfx_workaround_needed(void)652 static bool __init snb_gfx_workaround_needed(void)
653 {
654 #ifdef CONFIG_PCI
655 int i;
656 u16 vendor, devid;
657 static const __initconst u16 snb_ids[] = {
658 0x0102,
659 0x0112,
660 0x0122,
661 0x0106,
662 0x0116,
663 0x0126,
664 0x010a,
665 };
666
667 /* Assume no if something weird is going on with PCI */
668 if (!early_pci_allowed())
669 return false;
670
671 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
672 if (vendor != 0x8086)
673 return false;
674
675 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
676 for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
677 if (devid == snb_ids[i])
678 return true;
679 #endif
680
681 return false;
682 }
683
684 /*
685 * Sandy Bridge graphics has trouble with certain ranges, exclude
686 * them from allocation.
687 */
trim_snb_memory(void)688 static void __init trim_snb_memory(void)
689 {
690 static const __initconst unsigned long bad_pages[] = {
691 0x20050000,
692 0x20110000,
693 0x20130000,
694 0x20138000,
695 0x40004000,
696 };
697 int i;
698
699 if (!snb_gfx_workaround_needed())
700 return;
701
702 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
703
704 /*
705 * SandyBridge integrated graphics devices have a bug that prevents
706 * them from accessing certain memory ranges, namely anything below
707 * 1M and in the pages listed in bad_pages[] above.
708 *
709 * To avoid these pages being ever accessed by SNB gfx devices reserve
710 * bad_pages that have not already been reserved at boot time.
711 * All memory below the 1 MB mark is anyway reserved later during
712 * setup_arch(), so there is no need to reserve it here.
713 */
714
715 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
716 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
717 printk(KERN_WARNING "failed to reserve 0x%08lx\n",
718 bad_pages[i]);
719 }
720 }
721
trim_bios_range(void)722 static void __init trim_bios_range(void)
723 {
724 /*
725 * A special case is the first 4Kb of memory;
726 * This is a BIOS owned area, not kernel ram, but generally
727 * not listed as such in the E820 table.
728 *
729 * This typically reserves additional memory (64KiB by default)
730 * since some BIOSes are known to corrupt low memory. See the
731 * Kconfig help text for X86_RESERVE_LOW.
732 */
733 e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
734
735 /*
736 * special case: Some BIOSes report the PC BIOS
737 * area (640Kb -> 1Mb) as RAM even though it is not.
738 * take them out.
739 */
740 e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);
741
742 e820__update_table(e820_table);
743 }
744
745 /* called before trim_bios_range() to spare extra sanitize */
e820_add_kernel_range(void)746 static void __init e820_add_kernel_range(void)
747 {
748 u64 start = __pa_symbol(_text);
749 u64 size = __pa_symbol(_end) - start;
750
751 /*
752 * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
753 * attempt to fix it by adding the range. We may have a confused BIOS,
754 * or the user may have used memmap=exactmap or memmap=xxM$yyM to
755 * exclude kernel range. If we really are running on top non-RAM,
756 * we will crash later anyways.
757 */
758 if (e820__mapped_all(start, start + size, E820_TYPE_RAM))
759 return;
760
761 pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
762 e820__range_remove(start, size, E820_TYPE_RAM, 0);
763 e820__range_add(start, size, E820_TYPE_RAM);
764 }
765
early_reserve_memory(void)766 static void __init early_reserve_memory(void)
767 {
768 /*
769 * Reserve the memory occupied by the kernel between _text and
770 * __end_of_kernel_reserve symbols. Any kernel sections after the
771 * __end_of_kernel_reserve symbol must be explicitly reserved with a
772 * separate memblock_reserve() or they will be discarded.
773 */
774 memblock_reserve(__pa_symbol(_text),
775 (unsigned long)__end_of_kernel_reserve - (unsigned long)_text);
776
777 /*
778 * The first 4Kb of memory is a BIOS owned area, but generally it is
779 * not listed as such in the E820 table.
780 *
781 * Reserve the first 64K of memory since some BIOSes are known to
782 * corrupt low memory. After the real mode trampoline is allocated the
783 * rest of the memory below 640k is reserved.
784 *
785 * In addition, make sure page 0 is always reserved because on
786 * systems with L1TF its contents can be leaked to user processes.
787 */
788 memblock_reserve(0, SZ_64K);
789
790 early_reserve_initrd();
791
792 memblock_x86_reserve_range_setup_data();
793
794 reserve_bios_regions();
795 trim_snb_memory();
796 }
797
798 /*
799 * Dump out kernel offset information on panic.
800 */
801 static int
dump_kernel_offset(struct notifier_block * self,unsigned long v,void * p)802 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
803 {
804 if (kaslr_enabled()) {
805 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
806 kaslr_offset(),
807 __START_KERNEL,
808 __START_KERNEL_map,
809 MODULES_VADDR-1);
810 } else {
811 pr_emerg("Kernel Offset: disabled\n");
812 }
813
814 return 0;
815 }
816
x86_configure_nx(void)817 void x86_configure_nx(void)
818 {
819 if (boot_cpu_has(X86_FEATURE_NX))
820 __supported_pte_mask |= _PAGE_NX;
821 else
822 __supported_pte_mask &= ~_PAGE_NX;
823 }
824
x86_report_nx(void)825 static void __init x86_report_nx(void)
826 {
827 if (!boot_cpu_has(X86_FEATURE_NX)) {
828 printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
829 "missing in CPU!\n");
830 } else {
831 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
832 printk(KERN_INFO "NX (Execute Disable) protection: active\n");
833 #else
834 /* 32bit non-PAE kernel, NX cannot be used */
835 printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
836 "cannot be enabled: non-PAE kernel!\n");
837 #endif
838 }
839 }
840
841 /*
842 * Determine if we were loaded by an EFI loader. If so, then we have also been
843 * passed the efi memmap, systab, etc., so we should use these data structures
844 * for initialization. Note, the efi init code path is determined by the
845 * global efi_enabled. This allows the same kernel image to be used on existing
846 * systems (with a traditional BIOS) as well as on EFI systems.
847 */
848 /*
849 * setup_arch - architecture-specific boot-time initializations
850 *
851 * Note: On x86_64, fixmaps are ready for use even before this is called.
852 */
853
setup_arch(char ** cmdline_p)854 void __init setup_arch(char **cmdline_p)
855 {
856 #ifdef CONFIG_X86_32
857 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
858
859 /*
860 * copy kernel address range established so far and switch
861 * to the proper swapper page table
862 */
863 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
864 initial_page_table + KERNEL_PGD_BOUNDARY,
865 KERNEL_PGD_PTRS);
866
867 load_cr3(swapper_pg_dir);
868 /*
869 * Note: Quark X1000 CPUs advertise PGE incorrectly and require
870 * a cr3 based tlb flush, so the following __flush_tlb_all()
871 * will not flush anything because the CPU quirk which clears
872 * X86_FEATURE_PGE has not been invoked yet. Though due to the
873 * load_cr3() above the TLB has been flushed already. The
874 * quirk is invoked before subsequent calls to __flush_tlb_all()
875 * so proper operation is guaranteed.
876 */
877 __flush_tlb_all();
878 #else
879 printk(KERN_INFO "Command line: %s\n", boot_command_line);
880 boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS;
881 #endif
882
883 /*
884 * If we have OLPC OFW, we might end up relocating the fixmap due to
885 * reserve_top(), so do this before touching the ioremap area.
886 */
887 olpc_ofw_detect();
888
889 idt_setup_early_traps();
890 early_cpu_init();
891 jump_label_init();
892 static_call_init();
893 early_ioremap_init();
894
895 setup_olpc_ofw_pgd();
896
897 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
898 screen_info = boot_params.screen_info;
899 edid_info = boot_params.edid_info;
900 #ifdef CONFIG_X86_32
901 apm_info.bios = boot_params.apm_bios_info;
902 ist_info = boot_params.ist_info;
903 #endif
904 saved_video_mode = boot_params.hdr.vid_mode;
905 bootloader_type = boot_params.hdr.type_of_loader;
906 if ((bootloader_type >> 4) == 0xe) {
907 bootloader_type &= 0xf;
908 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
909 }
910 bootloader_version = bootloader_type & 0xf;
911 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
912
913 #ifdef CONFIG_BLK_DEV_RAM
914 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
915 #endif
916 #ifdef CONFIG_EFI
917 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
918 EFI32_LOADER_SIGNATURE, 4)) {
919 set_bit(EFI_BOOT, &efi.flags);
920 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
921 EFI64_LOADER_SIGNATURE, 4)) {
922 set_bit(EFI_BOOT, &efi.flags);
923 set_bit(EFI_64BIT, &efi.flags);
924 }
925 #endif
926
927 x86_init.oem.arch_setup();
928
929 /*
930 * Do some memory reservations *before* memory is added to memblock, so
931 * memblock allocations won't overwrite it.
932 *
933 * After this point, everything still needed from the boot loader or
934 * firmware or kernel text should be early reserved or marked not RAM in
935 * e820. All other memory is free game.
936 *
937 * This call needs to happen before e820__memory_setup() which calls the
938 * xen_memory_setup() on Xen dom0 which relies on the fact that those
939 * early reservations have happened already.
940 */
941 early_reserve_memory();
942
943 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
944 e820__memory_setup();
945 parse_setup_data();
946
947 copy_edd();
948
949 if (!boot_params.hdr.root_flags)
950 root_mountflags &= ~MS_RDONLY;
951 setup_initial_init_mm(_text, _etext, _edata, (void *)_brk_end);
952
953 code_resource.start = __pa_symbol(_text);
954 code_resource.end = __pa_symbol(_etext)-1;
955 rodata_resource.start = __pa_symbol(__start_rodata);
956 rodata_resource.end = __pa_symbol(__end_rodata)-1;
957 data_resource.start = __pa_symbol(_sdata);
958 data_resource.end = __pa_symbol(_edata)-1;
959 bss_resource.start = __pa_symbol(__bss_start);
960 bss_resource.end = __pa_symbol(__bss_stop)-1;
961
962 #ifdef CONFIG_CMDLINE_BOOL
963 #ifdef CONFIG_CMDLINE_OVERRIDE
964 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
965 #else
966 if (builtin_cmdline[0]) {
967 /* append boot loader cmdline to builtin */
968 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
969 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
970 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
971 }
972 #endif
973 #endif
974
975 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
976 *cmdline_p = command_line;
977
978 /*
979 * x86_configure_nx() is called before parse_early_param() to detect
980 * whether hardware doesn't support NX (so that the early EHCI debug
981 * console setup can safely call set_fixmap()).
982 */
983 x86_configure_nx();
984
985 parse_early_param();
986
987 if (efi_enabled(EFI_BOOT))
988 efi_memblock_x86_reserve_range();
989
990 #ifdef CONFIG_MEMORY_HOTPLUG
991 /*
992 * Memory used by the kernel cannot be hot-removed because Linux
993 * cannot migrate the kernel pages. When memory hotplug is
994 * enabled, we should prevent memblock from allocating memory
995 * for the kernel.
996 *
997 * ACPI SRAT records all hotpluggable memory ranges. But before
998 * SRAT is parsed, we don't know about it.
999 *
1000 * The kernel image is loaded into memory at very early time. We
1001 * cannot prevent this anyway. So on NUMA system, we set any
1002 * node the kernel resides in as un-hotpluggable.
1003 *
1004 * Since on modern servers, one node could have double-digit
1005 * gigabytes memory, we can assume the memory around the kernel
1006 * image is also un-hotpluggable. So before SRAT is parsed, just
1007 * allocate memory near the kernel image to try the best to keep
1008 * the kernel away from hotpluggable memory.
1009 */
1010 if (movable_node_is_enabled())
1011 memblock_set_bottom_up(true);
1012 #endif
1013
1014 x86_report_nx();
1015
1016 apic_setup_apic_calls();
1017
1018 if (acpi_mps_check()) {
1019 #ifdef CONFIG_X86_LOCAL_APIC
1020 apic_is_disabled = true;
1021 #endif
1022 setup_clear_cpu_cap(X86_FEATURE_APIC);
1023 }
1024
1025 e820__reserve_setup_data();
1026 e820__finish_early_params();
1027
1028 if (efi_enabled(EFI_BOOT))
1029 efi_init();
1030
1031 reserve_ibft_region();
1032 x86_init.resources.dmi_setup();
1033
1034 /*
1035 * VMware detection requires dmi to be available, so this
1036 * needs to be done after dmi_setup(), for the boot CPU.
1037 * For some guest types (Xen PV, SEV-SNP, TDX) it is required to be
1038 * called before cache_bp_init() for setting up MTRR state.
1039 */
1040 init_hypervisor_platform();
1041
1042 tsc_early_init();
1043 x86_init.resources.probe_roms();
1044
1045 /* after parse_early_param, so could debug it */
1046 insert_resource(&iomem_resource, &code_resource);
1047 insert_resource(&iomem_resource, &rodata_resource);
1048 insert_resource(&iomem_resource, &data_resource);
1049 insert_resource(&iomem_resource, &bss_resource);
1050
1051 e820_add_kernel_range();
1052 trim_bios_range();
1053 #ifdef CONFIG_X86_32
1054 if (ppro_with_ram_bug()) {
1055 e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM,
1056 E820_TYPE_RESERVED);
1057 e820__update_table(e820_table);
1058 printk(KERN_INFO "fixed physical RAM map:\n");
1059 e820__print_table("bad_ppro");
1060 }
1061 #else
1062 early_gart_iommu_check();
1063 #endif
1064
1065 /*
1066 * partially used pages are not usable - thus
1067 * we are rounding upwards:
1068 */
1069 max_pfn = e820__end_of_ram_pfn();
1070
1071 /* update e820 for memory not covered by WB MTRRs */
1072 cache_bp_init();
1073 if (mtrr_trim_uncached_memory(max_pfn))
1074 max_pfn = e820__end_of_ram_pfn();
1075
1076 max_possible_pfn = max_pfn;
1077
1078 /*
1079 * Define random base addresses for memory sections after max_pfn is
1080 * defined and before each memory section base is used.
1081 */
1082 kernel_randomize_memory();
1083
1084 #ifdef CONFIG_X86_32
1085 /* max_low_pfn get updated here */
1086 find_low_pfn_range();
1087 #else
1088 check_x2apic();
1089
1090 /* How many end-of-memory variables you have, grandma! */
1091 /* need this before calling reserve_initrd */
1092 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1093 max_low_pfn = e820__end_of_low_ram_pfn();
1094 else
1095 max_low_pfn = max_pfn;
1096
1097 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1098 #endif
1099
1100 /*
1101 * Find and reserve possible boot-time SMP configuration:
1102 */
1103 find_smp_config();
1104
1105 early_alloc_pgt_buf();
1106
1107 /*
1108 * Need to conclude brk, before e820__memblock_setup()
1109 * it could use memblock_find_in_range, could overlap with
1110 * brk area.
1111 */
1112 reserve_brk();
1113
1114 cleanup_highmap();
1115
1116 memblock_set_current_limit(ISA_END_ADDRESS);
1117 e820__memblock_setup();
1118
1119 /*
1120 * Needs to run after memblock setup because it needs the physical
1121 * memory size.
1122 */
1123 sev_setup_arch();
1124 cc_random_init();
1125
1126 efi_fake_memmap();
1127 efi_find_mirror();
1128 efi_esrt_init();
1129 efi_mokvar_table_init();
1130
1131 /*
1132 * The EFI specification says that boot service code won't be
1133 * called after ExitBootServices(). This is, in fact, a lie.
1134 */
1135 efi_reserve_boot_services();
1136
1137 /* preallocate 4k for mptable mpc */
1138 e820__memblock_alloc_reserved_mpc_new();
1139
1140 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1141 setup_bios_corruption_check();
1142 #endif
1143
1144 #ifdef CONFIG_X86_32
1145 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1146 (max_pfn_mapped<<PAGE_SHIFT) - 1);
1147 #endif
1148
1149 /*
1150 * Find free memory for the real mode trampoline and place it there. If
1151 * there is not enough free memory under 1M, on EFI-enabled systems
1152 * there will be additional attempt to reclaim the memory for the real
1153 * mode trampoline at efi_free_boot_services().
1154 *
1155 * Unconditionally reserve the entire first 1M of RAM because BIOSes
1156 * are known to corrupt low memory and several hundred kilobytes are not
1157 * worth complex detection what memory gets clobbered. Windows does the
1158 * same thing for very similar reasons.
1159 *
1160 * Moreover, on machines with SandyBridge graphics or in setups that use
1161 * crashkernel the entire 1M is reserved anyway.
1162 */
1163 x86_platform.realmode_reserve();
1164
1165 init_mem_mapping();
1166
1167 idt_setup_early_pf();
1168
1169 /*
1170 * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1171 * with the current CR4 value. This may not be necessary, but
1172 * auditing all the early-boot CR4 manipulation would be needed to
1173 * rule it out.
1174 *
1175 * Mask off features that don't work outside long mode (just
1176 * PCIDE for now).
1177 */
1178 mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE;
1179
1180 memblock_set_current_limit(get_max_mapped());
1181
1182 /*
1183 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1184 */
1185
1186 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1187 if (init_ohci1394_dma_early)
1188 init_ohci1394_dma_on_all_controllers();
1189 #endif
1190 /* Allocate bigger log buffer */
1191 setup_log_buf(1);
1192
1193 if (efi_enabled(EFI_BOOT)) {
1194 switch (boot_params.secure_boot) {
1195 case efi_secureboot_mode_disabled:
1196 pr_info("Secure boot disabled\n");
1197 break;
1198 case efi_secureboot_mode_enabled:
1199 pr_info("Secure boot enabled\n");
1200 break;
1201 default:
1202 pr_info("Secure boot could not be determined\n");
1203 break;
1204 }
1205 }
1206
1207 reserve_initrd();
1208
1209 acpi_table_upgrade();
1210 /* Look for ACPI tables and reserve memory occupied by them. */
1211 acpi_boot_table_init();
1212
1213 vsmp_init();
1214
1215 io_delay_init();
1216
1217 early_platform_quirks();
1218
1219 early_acpi_boot_init();
1220
1221 initmem_init();
1222 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1223
1224 if (boot_cpu_has(X86_FEATURE_GBPAGES))
1225 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
1226
1227 /*
1228 * Reserve memory for crash kernel after SRAT is parsed so that it
1229 * won't consume hotpluggable memory.
1230 */
1231 reserve_crashkernel();
1232
1233 memblock_find_dma_reserve();
1234
1235 if (!early_xdbc_setup_hardware())
1236 early_xdbc_register_console();
1237
1238 x86_init.paging.pagetable_init();
1239
1240 kasan_init();
1241
1242 /*
1243 * Sync back kernel address range.
1244 *
1245 * FIXME: Can the later sync in setup_cpu_entry_areas() replace
1246 * this call?
1247 */
1248 sync_initial_page_table();
1249
1250 tboot_probe();
1251
1252 map_vsyscall();
1253
1254 x86_32_probe_apic();
1255
1256 early_quirks();
1257
1258 /*
1259 * Read APIC and some other early information from ACPI tables.
1260 */
1261 acpi_boot_init();
1262 x86_dtb_init();
1263
1264 /*
1265 * get boot-time SMP configuration:
1266 */
1267 get_smp_config();
1268
1269 /*
1270 * Systems w/o ACPI and mptables might not have it mapped the local
1271 * APIC yet, but prefill_possible_map() might need to access it.
1272 */
1273 init_apic_mappings();
1274
1275 prefill_possible_map();
1276
1277 init_cpu_to_node();
1278 init_gi_nodes();
1279
1280 io_apic_init_mappings();
1281
1282 x86_init.hyper.guest_late_init();
1283
1284 e820__reserve_resources();
1285 e820__register_nosave_regions(max_pfn);
1286
1287 x86_init.resources.reserve_resources();
1288
1289 e820__setup_pci_gap();
1290
1291 #ifdef CONFIG_VT
1292 #if defined(CONFIG_VGA_CONSOLE)
1293 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1294 conswitchp = &vga_con;
1295 #endif
1296 #endif
1297 x86_init.oem.banner();
1298
1299 x86_init.timers.wallclock_init();
1300
1301 /*
1302 * This needs to run before setup_local_APIC() which soft-disables the
1303 * local APIC temporarily and that masks the thermal LVT interrupt,
1304 * leading to softlockups on machines which have configured SMI
1305 * interrupt delivery.
1306 */
1307 therm_lvt_init();
1308
1309 mcheck_init();
1310
1311 register_refined_jiffies(CLOCK_TICK_RATE);
1312
1313 #ifdef CONFIG_EFI
1314 if (efi_enabled(EFI_BOOT))
1315 efi_apply_memmap_quirks();
1316 #endif
1317
1318 unwind_init();
1319 }
1320
1321 #ifdef CONFIG_X86_32
1322
1323 static struct resource video_ram_resource = {
1324 .name = "Video RAM area",
1325 .start = 0xa0000,
1326 .end = 0xbffff,
1327 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1328 };
1329
i386_reserve_resources(void)1330 void __init i386_reserve_resources(void)
1331 {
1332 request_resource(&iomem_resource, &video_ram_resource);
1333 reserve_standard_io_resources();
1334 }
1335
1336 #endif /* CONFIG_X86_32 */
1337
1338 static struct notifier_block kernel_offset_notifier = {
1339 .notifier_call = dump_kernel_offset
1340 };
1341
register_kernel_offset_dumper(void)1342 static int __init register_kernel_offset_dumper(void)
1343 {
1344 atomic_notifier_chain_register(&panic_notifier_list,
1345 &kernel_offset_notifier);
1346 return 0;
1347 }
1348 __initcall(register_kernel_offset_dumper);
1349