mtd: nand: omap: Fix comment in platform data using wrong Kconfig symbol
[linux/fpc-iii.git] / arch / x86 / kernel / setup.c
blob3d872a527cd966facecec3bd8440677ae1d99204
1 /*
2 * Copyright (C) 1995 Linus Torvalds
4 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
6 * Memory region support
7 * David Parsons <orc@pell.chi.il.us>, July-August 1999
9 * Added E820 sanitization routine (removes overlapping memory regions);
10 * Brian Moyle <bmoyle@mvista.com>, February 2001
12 * Moved CPU detection code to cpu/${cpu}.c
13 * Patrick Mochel <mochel@osdl.org>, March 2002
15 * Provisions for empty E820 memory regions (reported by certain BIOSes).
16 * Alex Achenbach <xela@slit.de>, December 2002.
21 * This file handles the architecture-dependent parts of initialization
24 #include <linux/sched.h>
25 #include <linux/mm.h>
26 #include <linux/mmzone.h>
27 #include <linux/screen_info.h>
28 #include <linux/ioport.h>
29 #include <linux/acpi.h>
30 #include <linux/sfi.h>
31 #include <linux/apm_bios.h>
32 #include <linux/initrd.h>
33 #include <linux/memblock.h>
34 #include <linux/seq_file.h>
35 #include <linux/console.h>
36 #include <linux/root_dev.h>
37 #include <linux/highmem.h>
38 #include <linux/export.h>
39 #include <linux/efi.h>
40 #include <linux/init.h>
41 #include <linux/edd.h>
42 #include <linux/iscsi_ibft.h>
43 #include <linux/nodemask.h>
44 #include <linux/kexec.h>
45 #include <linux/dmi.h>
46 #include <linux/pfn.h>
47 #include <linux/pci.h>
48 #include <asm/pci-direct.h>
49 #include <linux/init_ohci1394_dma.h>
50 #include <linux/kvm_para.h>
51 #include <linux/dma-contiguous.h>
52 #include <xen/xen.h>
53 #include <uapi/linux/mount.h>
55 #include <linux/errno.h>
56 #include <linux/kernel.h>
57 #include <linux/stddef.h>
58 #include <linux/unistd.h>
59 #include <linux/ptrace.h>
60 #include <linux/user.h>
61 #include <linux/delay.h>
63 #include <linux/kallsyms.h>
64 #include <linux/cpufreq.h>
65 #include <linux/dma-mapping.h>
66 #include <linux/ctype.h>
67 #include <linux/uaccess.h>
69 #include <linux/percpu.h>
70 #include <linux/crash_dump.h>
71 #include <linux/tboot.h>
72 #include <linux/jiffies.h>
73 #include <linux/mem_encrypt.h>
75 #include <linux/usb/xhci-dbgp.h>
76 #include <video/edid.h>
78 #include <asm/mtrr.h>
79 #include <asm/apic.h>
80 #include <asm/realmode.h>
81 #include <asm/e820/api.h>
82 #include <asm/mpspec.h>
83 #include <asm/setup.h>
84 #include <asm/efi.h>
85 #include <asm/timer.h>
86 #include <asm/i8259.h>
87 #include <asm/sections.h>
88 #include <asm/io_apic.h>
89 #include <asm/ist.h>
90 #include <asm/setup_arch.h>
91 #include <asm/bios_ebda.h>
92 #include <asm/cacheflush.h>
93 #include <asm/processor.h>
94 #include <asm/bugs.h>
95 #include <asm/kasan.h>
97 #include <asm/vsyscall.h>
98 #include <asm/cpu.h>
99 #include <asm/desc.h>
100 #include <asm/dma.h>
101 #include <asm/iommu.h>
102 #include <asm/gart.h>
103 #include <asm/mmu_context.h>
104 #include <asm/proto.h>
106 #include <asm/paravirt.h>
107 #include <asm/hypervisor.h>
108 #include <asm/olpc_ofw.h>
110 #include <asm/percpu.h>
111 #include <asm/topology.h>
112 #include <asm/apicdef.h>
113 #include <asm/amd_nb.h>
114 #include <asm/mce.h>
115 #include <asm/alternative.h>
116 #include <asm/prom.h>
117 #include <asm/microcode.h>
118 #include <asm/kaslr.h>
119 #include <asm/unwind.h>
122 * max_low_pfn_mapped: highest direct mapped pfn under 4GB
123 * max_pfn_mapped: highest direct mapped pfn over 4GB
125 * The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
126 * represented by pfn_mapped
128 unsigned long max_low_pfn_mapped;
129 unsigned long max_pfn_mapped;
131 #ifdef CONFIG_DMI
132 RESERVE_BRK(dmi_alloc, 65536);
133 #endif
136 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
137 unsigned long _brk_end = (unsigned long)__brk_base;
139 struct boot_params boot_params;
142 * Machine setup..
144 static struct resource data_resource = {
145 .name = "Kernel data",
146 .start = 0,
147 .end = 0,
148 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
151 static struct resource code_resource = {
152 .name = "Kernel code",
153 .start = 0,
154 .end = 0,
155 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
158 static struct resource bss_resource = {
159 .name = "Kernel bss",
160 .start = 0,
161 .end = 0,
162 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
166 #ifdef CONFIG_X86_32
167 /* cpu data as detected by the assembly code in head_32.S */
168 struct cpuinfo_x86 new_cpu_data;
170 /* common cpu data for all cpus */
171 struct cpuinfo_x86 boot_cpu_data __read_mostly;
172 EXPORT_SYMBOL(boot_cpu_data);
174 unsigned int def_to_bigsmp;
176 /* for MCA, but anyone else can use it if they want */
177 unsigned int machine_id;
178 unsigned int machine_submodel_id;
179 unsigned int BIOS_revision;
181 struct apm_info apm_info;
182 EXPORT_SYMBOL(apm_info);
184 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
185 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
186 struct ist_info ist_info;
187 EXPORT_SYMBOL(ist_info);
188 #else
189 struct ist_info ist_info;
190 #endif
192 #else
193 struct cpuinfo_x86 boot_cpu_data __read_mostly;
194 EXPORT_SYMBOL(boot_cpu_data);
195 #endif
198 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
199 __visible unsigned long mmu_cr4_features __ro_after_init;
200 #else
201 __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
202 #endif
204 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
205 int bootloader_type, bootloader_version;
208 * Setup options
210 struct screen_info screen_info;
211 EXPORT_SYMBOL(screen_info);
212 struct edid_info edid_info;
213 EXPORT_SYMBOL_GPL(edid_info);
215 extern int root_mountflags;
217 unsigned long saved_video_mode;
219 #define RAMDISK_IMAGE_START_MASK 0x07FF
220 #define RAMDISK_PROMPT_FLAG 0x8000
221 #define RAMDISK_LOAD_FLAG 0x4000
223 static char __initdata command_line[COMMAND_LINE_SIZE];
224 #ifdef CONFIG_CMDLINE_BOOL
225 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
226 #endif
228 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
229 struct edd edd;
230 #ifdef CONFIG_EDD_MODULE
231 EXPORT_SYMBOL(edd);
232 #endif
234 * copy_edd() - Copy the BIOS EDD information
235 * from boot_params into a safe place.
238 static inline void __init copy_edd(void)
240 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
241 sizeof(edd.mbr_signature));
242 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
243 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
244 edd.edd_info_nr = boot_params.eddbuf_entries;
246 #else
247 static inline void __init copy_edd(void)
250 #endif
252 void * __init extend_brk(size_t size, size_t align)
254 size_t mask = align - 1;
255 void *ret;
257 BUG_ON(_brk_start == 0);
258 BUG_ON(align & mask);
260 _brk_end = (_brk_end + mask) & ~mask;
261 BUG_ON((char *)(_brk_end + size) > __brk_limit);
263 ret = (void *)_brk_end;
264 _brk_end += size;
266 memset(ret, 0, size);
268 return ret;
271 #ifdef CONFIG_X86_32
272 static void __init cleanup_highmap(void)
275 #endif
277 static void __init reserve_brk(void)
279 if (_brk_end > _brk_start)
280 memblock_reserve(__pa_symbol(_brk_start),
281 _brk_end - _brk_start);
283 /* Mark brk area as locked down and no longer taking any
284 new allocations */
285 _brk_start = 0;
288 u64 relocated_ramdisk;
290 #ifdef CONFIG_BLK_DEV_INITRD
292 static u64 __init get_ramdisk_image(void)
294 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
296 ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
298 return ramdisk_image;
300 static u64 __init get_ramdisk_size(void)
302 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
304 ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
306 return ramdisk_size;
309 static void __init relocate_initrd(void)
311 /* Assume only end is not page aligned */
312 u64 ramdisk_image = get_ramdisk_image();
313 u64 ramdisk_size = get_ramdisk_size();
314 u64 area_size = PAGE_ALIGN(ramdisk_size);
316 /* We need to move the initrd down into directly mapped mem */
317 relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
318 area_size, PAGE_SIZE);
320 if (!relocated_ramdisk)
321 panic("Cannot find place for new RAMDISK of size %lld\n",
322 ramdisk_size);
324 /* Note: this includes all the mem currently occupied by
325 the initrd, we rely on that fact to keep the data intact. */
326 memblock_reserve(relocated_ramdisk, area_size);
327 initrd_start = relocated_ramdisk + PAGE_OFFSET;
328 initrd_end = initrd_start + ramdisk_size;
329 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
330 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
332 copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
334 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
335 " [mem %#010llx-%#010llx]\n",
336 ramdisk_image, ramdisk_image + ramdisk_size - 1,
337 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
340 static void __init early_reserve_initrd(void)
342 /* Assume only end is not page aligned */
343 u64 ramdisk_image = get_ramdisk_image();
344 u64 ramdisk_size = get_ramdisk_size();
345 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
347 if (!boot_params.hdr.type_of_loader ||
348 !ramdisk_image || !ramdisk_size)
349 return; /* No initrd provided by bootloader */
351 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
353 static void __init reserve_initrd(void)
355 /* Assume only end is not page aligned */
356 u64 ramdisk_image = get_ramdisk_image();
357 u64 ramdisk_size = get_ramdisk_size();
358 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
359 u64 mapped_size;
361 if (!boot_params.hdr.type_of_loader ||
362 !ramdisk_image || !ramdisk_size)
363 return; /* No initrd provided by bootloader */
365 initrd_start = 0;
367 mapped_size = memblock_mem_size(max_pfn_mapped);
368 if (ramdisk_size >= (mapped_size>>1))
369 panic("initrd too large to handle, "
370 "disabling initrd (%lld needed, %lld available)\n",
371 ramdisk_size, mapped_size>>1);
373 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
374 ramdisk_end - 1);
376 if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
377 PFN_DOWN(ramdisk_end))) {
378 /* All are mapped, easy case */
379 initrd_start = ramdisk_image + PAGE_OFFSET;
380 initrd_end = initrd_start + ramdisk_size;
381 return;
384 relocate_initrd();
386 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
389 #else
390 static void __init early_reserve_initrd(void)
393 static void __init reserve_initrd(void)
396 #endif /* CONFIG_BLK_DEV_INITRD */
398 static void __init parse_setup_data(void)
400 struct setup_data *data;
401 u64 pa_data, pa_next;
403 pa_data = boot_params.hdr.setup_data;
404 while (pa_data) {
405 u32 data_len, data_type;
407 data = early_memremap(pa_data, sizeof(*data));
408 data_len = data->len + sizeof(struct setup_data);
409 data_type = data->type;
410 pa_next = data->next;
411 early_memunmap(data, sizeof(*data));
413 switch (data_type) {
414 case SETUP_E820_EXT:
415 e820__memory_setup_extended(pa_data, data_len);
416 break;
417 case SETUP_DTB:
418 add_dtb(pa_data);
419 break;
420 case SETUP_EFI:
421 parse_efi_setup(pa_data, data_len);
422 break;
423 default:
424 break;
426 pa_data = pa_next;
430 static void __init memblock_x86_reserve_range_setup_data(void)
432 struct setup_data *data;
433 u64 pa_data;
435 pa_data = boot_params.hdr.setup_data;
436 while (pa_data) {
437 data = early_memremap(pa_data, sizeof(*data));
438 memblock_reserve(pa_data, sizeof(*data) + data->len);
439 pa_data = data->next;
440 early_memunmap(data, sizeof(*data));
445 * --------- Crashkernel reservation ------------------------------
448 #ifdef CONFIG_KEXEC_CORE
450 /* 16M alignment for crash kernel regions */
451 #define CRASH_ALIGN (16 << 20)
454 * Keep the crash kernel below this limit. On 32 bits earlier kernels
455 * would limit the kernel to the low 512 MiB due to mapping restrictions.
456 * On 64bit, old kexec-tools need to under 896MiB.
458 #ifdef CONFIG_X86_32
459 # define CRASH_ADDR_LOW_MAX (512 << 20)
460 # define CRASH_ADDR_HIGH_MAX (512 << 20)
461 #else
462 # define CRASH_ADDR_LOW_MAX (896UL << 20)
463 # define CRASH_ADDR_HIGH_MAX MAXMEM
464 #endif
466 static int __init reserve_crashkernel_low(void)
468 #ifdef CONFIG_X86_64
469 unsigned long long base, low_base = 0, low_size = 0;
470 unsigned long total_low_mem;
471 int ret;
473 total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
475 /* crashkernel=Y,low */
476 ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
477 if (ret) {
479 * two parts from lib/swiotlb.c:
480 * -swiotlb size: user-specified with swiotlb= or default.
482 * -swiotlb overflow buffer: now hardcoded to 32k. We round it
483 * to 8M for other buffers that may need to stay low too. Also
484 * make sure we allocate enough extra low memory so that we
485 * don't run out of DMA buffers for 32-bit devices.
487 low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
488 } else {
489 /* passed with crashkernel=0,low ? */
490 if (!low_size)
491 return 0;
494 low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN);
495 if (!low_base) {
496 pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
497 (unsigned long)(low_size >> 20));
498 return -ENOMEM;
501 ret = memblock_reserve(low_base, low_size);
502 if (ret) {
503 pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
504 return ret;
507 pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
508 (unsigned long)(low_size >> 20),
509 (unsigned long)(low_base >> 20),
510 (unsigned long)(total_low_mem >> 20));
512 crashk_low_res.start = low_base;
513 crashk_low_res.end = low_base + low_size - 1;
514 insert_resource(&iomem_resource, &crashk_low_res);
515 #endif
516 return 0;
519 static void __init reserve_crashkernel(void)
521 unsigned long long crash_size, crash_base, total_mem;
522 bool high = false;
523 int ret;
525 total_mem = memblock_phys_mem_size();
527 /* crashkernel=XM */
528 ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
529 if (ret != 0 || crash_size <= 0) {
530 /* crashkernel=X,high */
531 ret = parse_crashkernel_high(boot_command_line, total_mem,
532 &crash_size, &crash_base);
533 if (ret != 0 || crash_size <= 0)
534 return;
535 high = true;
538 if (xen_pv_domain()) {
539 pr_info("Ignoring crashkernel for a Xen PV domain\n");
540 return;
543 /* 0 means: find the address automatically */
544 if (crash_base <= 0) {
546 * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
547 * as old kexec-tools loads bzImage below that, unless
548 * "crashkernel=size[KMG],high" is specified.
550 crash_base = memblock_find_in_range(CRASH_ALIGN,
551 high ? CRASH_ADDR_HIGH_MAX
552 : CRASH_ADDR_LOW_MAX,
553 crash_size, CRASH_ALIGN);
554 if (!crash_base) {
555 pr_info("crashkernel reservation failed - No suitable area found.\n");
556 return;
559 } else {
560 unsigned long long start;
562 start = memblock_find_in_range(crash_base,
563 crash_base + crash_size,
564 crash_size, 1 << 20);
565 if (start != crash_base) {
566 pr_info("crashkernel reservation failed - memory is in use.\n");
567 return;
570 ret = memblock_reserve(crash_base, crash_size);
571 if (ret) {
572 pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
573 return;
576 if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
577 memblock_free(crash_base, crash_size);
578 return;
581 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
582 (unsigned long)(crash_size >> 20),
583 (unsigned long)(crash_base >> 20),
584 (unsigned long)(total_mem >> 20));
586 crashk_res.start = crash_base;
587 crashk_res.end = crash_base + crash_size - 1;
588 insert_resource(&iomem_resource, &crashk_res);
590 #else
591 static void __init reserve_crashkernel(void)
594 #endif
596 static struct resource standard_io_resources[] = {
597 { .name = "dma1", .start = 0x00, .end = 0x1f,
598 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
599 { .name = "pic1", .start = 0x20, .end = 0x21,
600 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
601 { .name = "timer0", .start = 0x40, .end = 0x43,
602 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
603 { .name = "timer1", .start = 0x50, .end = 0x53,
604 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
605 { .name = "keyboard", .start = 0x60, .end = 0x60,
606 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
607 { .name = "keyboard", .start = 0x64, .end = 0x64,
608 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
609 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
610 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
611 { .name = "pic2", .start = 0xa0, .end = 0xa1,
612 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
613 { .name = "dma2", .start = 0xc0, .end = 0xdf,
614 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
615 { .name = "fpu", .start = 0xf0, .end = 0xff,
616 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
619 void __init reserve_standard_io_resources(void)
621 int i;
623 /* request I/O space for devices used on all i[345]86 PCs */
624 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
625 request_resource(&ioport_resource, &standard_io_resources[i]);
629 static __init void reserve_ibft_region(void)
631 unsigned long addr, size = 0;
633 addr = find_ibft_region(&size);
635 if (size)
636 memblock_reserve(addr, size);
639 static bool __init snb_gfx_workaround_needed(void)
641 #ifdef CONFIG_PCI
642 int i;
643 u16 vendor, devid;
644 static const __initconst u16 snb_ids[] = {
645 0x0102,
646 0x0112,
647 0x0122,
648 0x0106,
649 0x0116,
650 0x0126,
651 0x010a,
654 /* Assume no if something weird is going on with PCI */
655 if (!early_pci_allowed())
656 return false;
658 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
659 if (vendor != 0x8086)
660 return false;
662 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
663 for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
664 if (devid == snb_ids[i])
665 return true;
666 #endif
668 return false;
672 * Sandy Bridge graphics has trouble with certain ranges, exclude
673 * them from allocation.
675 static void __init trim_snb_memory(void)
677 static const __initconst unsigned long bad_pages[] = {
678 0x20050000,
679 0x20110000,
680 0x20130000,
681 0x20138000,
682 0x40004000,
684 int i;
686 if (!snb_gfx_workaround_needed())
687 return;
689 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
692 * Reserve all memory below the 1 MB mark that has not
693 * already been reserved.
695 memblock_reserve(0, 1<<20);
697 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
698 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
699 printk(KERN_WARNING "failed to reserve 0x%08lx\n",
700 bad_pages[i]);
705 * Here we put platform-specific memory range workarounds, i.e.
706 * memory known to be corrupt or otherwise in need to be reserved on
707 * specific platforms.
709 * If this gets used more widely it could use a real dispatch mechanism.
711 static void __init trim_platform_memory_ranges(void)
713 trim_snb_memory();
716 static void __init trim_bios_range(void)
719 * A special case is the first 4Kb of memory;
720 * This is a BIOS owned area, not kernel ram, but generally
721 * not listed as such in the E820 table.
723 * This typically reserves additional memory (64KiB by default)
724 * since some BIOSes are known to corrupt low memory. See the
725 * Kconfig help text for X86_RESERVE_LOW.
727 e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
730 * special case: Some BIOSen report the PC BIOS
731 * area (640->1Mb) as ram even though it is not.
732 * take them out.
734 e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);
736 e820__update_table(e820_table);
739 /* called before trim_bios_range() to spare extra sanitize */
740 static void __init e820_add_kernel_range(void)
742 u64 start = __pa_symbol(_text);
743 u64 size = __pa_symbol(_end) - start;
746 * Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
747 * attempt to fix it by adding the range. We may have a confused BIOS,
748 * or the user may have used memmap=exactmap or memmap=xxM$yyM to
749 * exclude kernel range. If we really are running on top non-RAM,
750 * we will crash later anyways.
752 if (e820__mapped_all(start, start + size, E820_TYPE_RAM))
753 return;
755 pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
756 e820__range_remove(start, size, E820_TYPE_RAM, 0);
757 e820__range_add(start, size, E820_TYPE_RAM);
760 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
762 static int __init parse_reservelow(char *p)
764 unsigned long long size;
766 if (!p)
767 return -EINVAL;
769 size = memparse(p, &p);
771 if (size < 4096)
772 size = 4096;
774 if (size > 640*1024)
775 size = 640*1024;
777 reserve_low = size;
779 return 0;
782 early_param("reservelow", parse_reservelow);
784 static void __init trim_low_memory_range(void)
786 memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
790 * Dump out kernel offset information on panic.
792 static int
793 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
795 if (kaslr_enabled()) {
796 pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
797 kaslr_offset(),
798 __START_KERNEL,
799 __START_KERNEL_map,
800 MODULES_VADDR-1);
801 } else {
802 pr_emerg("Kernel Offset: disabled\n");
805 return 0;
809 * Determine if we were loaded by an EFI loader. If so, then we have also been
810 * passed the efi memmap, systab, etc., so we should use these data structures
811 * for initialization. Note, the efi init code path is determined by the
812 * global efi_enabled. This allows the same kernel image to be used on existing
813 * systems (with a traditional BIOS) as well as on EFI systems.
816 * setup_arch - architecture-specific boot-time initializations
818 * Note: On x86_64, fixmaps are ready for use even before this is called.
821 void __init setup_arch(char **cmdline_p)
823 memblock_reserve(__pa_symbol(_text),
824 (unsigned long)__bss_stop - (unsigned long)_text);
827 * Make sure page 0 is always reserved because on systems with
828 * L1TF its contents can be leaked to user processes.
830 memblock_reserve(0, PAGE_SIZE);
832 early_reserve_initrd();
835 * At this point everything still needed from the boot loader
836 * or BIOS or kernel text should be early reserved or marked not
837 * RAM in e820. All other memory is free game.
840 #ifdef CONFIG_X86_32
841 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
844 * copy kernel address range established so far and switch
845 * to the proper swapper page table
847 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
848 initial_page_table + KERNEL_PGD_BOUNDARY,
849 KERNEL_PGD_PTRS);
851 load_cr3(swapper_pg_dir);
853 * Note: Quark X1000 CPUs advertise PGE incorrectly and require
854 * a cr3 based tlb flush, so the following __flush_tlb_all()
855 * will not flush anything because the cpu quirk which clears
856 * X86_FEATURE_PGE has not been invoked yet. Though due to the
857 * load_cr3() above the TLB has been flushed already. The
858 * quirk is invoked before subsequent calls to __flush_tlb_all()
859 * so proper operation is guaranteed.
861 __flush_tlb_all();
862 #else
863 printk(KERN_INFO "Command line: %s\n", boot_command_line);
864 boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS;
865 #endif
868 * If we have OLPC OFW, we might end up relocating the fixmap due to
869 * reserve_top(), so do this before touching the ioremap area.
871 olpc_ofw_detect();
873 idt_setup_early_traps();
874 early_cpu_init();
875 arch_init_ideal_nops();
876 jump_label_init();
877 early_ioremap_init();
879 setup_olpc_ofw_pgd();
881 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
882 screen_info = boot_params.screen_info;
883 edid_info = boot_params.edid_info;
884 #ifdef CONFIG_X86_32
885 apm_info.bios = boot_params.apm_bios_info;
886 ist_info = boot_params.ist_info;
887 #endif
888 saved_video_mode = boot_params.hdr.vid_mode;
889 bootloader_type = boot_params.hdr.type_of_loader;
890 if ((bootloader_type >> 4) == 0xe) {
891 bootloader_type &= 0xf;
892 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
894 bootloader_version = bootloader_type & 0xf;
895 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
897 #ifdef CONFIG_BLK_DEV_RAM
898 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
899 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
900 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
901 #endif
902 #ifdef CONFIG_EFI
903 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
904 EFI32_LOADER_SIGNATURE, 4)) {
905 set_bit(EFI_BOOT, &efi.flags);
906 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
907 EFI64_LOADER_SIGNATURE, 4)) {
908 set_bit(EFI_BOOT, &efi.flags);
909 set_bit(EFI_64BIT, &efi.flags);
911 #endif
913 x86_init.oem.arch_setup();
915 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
916 e820__memory_setup();
917 parse_setup_data();
919 copy_edd();
921 if (!boot_params.hdr.root_flags)
922 root_mountflags &= ~MS_RDONLY;
923 init_mm.start_code = (unsigned long) _text;
924 init_mm.end_code = (unsigned long) _etext;
925 init_mm.end_data = (unsigned long) _edata;
926 init_mm.brk = _brk_end;
928 mpx_mm_init(&init_mm);
930 code_resource.start = __pa_symbol(_text);
931 code_resource.end = __pa_symbol(_etext)-1;
932 data_resource.start = __pa_symbol(_etext);
933 data_resource.end = __pa_symbol(_edata)-1;
934 bss_resource.start = __pa_symbol(__bss_start);
935 bss_resource.end = __pa_symbol(__bss_stop)-1;
937 #ifdef CONFIG_CMDLINE_BOOL
938 #ifdef CONFIG_CMDLINE_OVERRIDE
939 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
940 #else
941 if (builtin_cmdline[0]) {
942 /* append boot loader cmdline to builtin */
943 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
944 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
945 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
947 #endif
948 #endif
950 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
951 *cmdline_p = command_line;
954 * x86_configure_nx() is called before parse_early_param() to detect
955 * whether hardware doesn't support NX (so that the early EHCI debug
956 * console setup can safely call set_fixmap()). It may then be called
957 * again from within noexec_setup() during parsing early parameters
958 * to honor the respective command line option.
960 x86_configure_nx();
962 parse_early_param();
964 if (efi_enabled(EFI_BOOT))
965 efi_memblock_x86_reserve_range();
966 #ifdef CONFIG_MEMORY_HOTPLUG
968 * Memory used by the kernel cannot be hot-removed because Linux
969 * cannot migrate the kernel pages. When memory hotplug is
970 * enabled, we should prevent memblock from allocating memory
971 * for the kernel.
973 * ACPI SRAT records all hotpluggable memory ranges. But before
974 * SRAT is parsed, we don't know about it.
976 * The kernel image is loaded into memory at very early time. We
977 * cannot prevent this anyway. So on NUMA system, we set any
978 * node the kernel resides in as un-hotpluggable.
980 * Since on modern servers, one node could have double-digit
981 * gigabytes memory, we can assume the memory around the kernel
982 * image is also un-hotpluggable. So before SRAT is parsed, just
983 * allocate memory near the kernel image to try the best to keep
984 * the kernel away from hotpluggable memory.
986 if (movable_node_is_enabled())
987 memblock_set_bottom_up(true);
988 #endif
990 x86_report_nx();
992 /* after early param, so could get panic from serial */
993 memblock_x86_reserve_range_setup_data();
995 if (acpi_mps_check()) {
996 #ifdef CONFIG_X86_LOCAL_APIC
997 disable_apic = 1;
998 #endif
999 setup_clear_cpu_cap(X86_FEATURE_APIC);
1002 e820__reserve_setup_data();
1003 e820__finish_early_params();
1005 if (efi_enabled(EFI_BOOT))
1006 efi_init();
1008 dmi_scan_machine();
1009 dmi_memdev_walk();
1010 dmi_set_dump_stack_arch_desc();
1013 * VMware detection requires dmi to be available, so this
1014 * needs to be done after dmi_scan_machine(), for the boot CPU.
1016 init_hypervisor_platform();
1018 tsc_early_init();
1019 x86_init.resources.probe_roms();
1021 /* after parse_early_param, so could debug it */
1022 insert_resource(&iomem_resource, &code_resource);
1023 insert_resource(&iomem_resource, &data_resource);
1024 insert_resource(&iomem_resource, &bss_resource);
1026 e820_add_kernel_range();
1027 trim_bios_range();
1028 #ifdef CONFIG_X86_32
1029 if (ppro_with_ram_bug()) {
1030 e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM,
1031 E820_TYPE_RESERVED);
1032 e820__update_table(e820_table);
1033 printk(KERN_INFO "fixed physical RAM map:\n");
1034 e820__print_table("bad_ppro");
1036 #else
1037 early_gart_iommu_check();
1038 #endif
1041 * partially used pages are not usable - thus
1042 * we are rounding upwards:
1044 max_pfn = e820__end_of_ram_pfn();
1046 /* update e820 for memory not covered by WB MTRRs */
1047 mtrr_bp_init();
1048 if (mtrr_trim_uncached_memory(max_pfn))
1049 max_pfn = e820__end_of_ram_pfn();
1051 max_possible_pfn = max_pfn;
1054 * This call is required when the CPU does not support PAT. If
1055 * mtrr_bp_init() invoked it already via pat_init() the call has no
1056 * effect.
1058 init_cache_modes();
1061 * Define random base addresses for memory sections after max_pfn is
1062 * defined and before each memory section base is used.
1064 kernel_randomize_memory();
1066 #ifdef CONFIG_X86_32
1067 /* max_low_pfn get updated here */
1068 find_low_pfn_range();
1069 #else
1070 check_x2apic();
1072 /* How many end-of-memory variables you have, grandma! */
1073 /* need this before calling reserve_initrd */
1074 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1075 max_low_pfn = e820__end_of_low_ram_pfn();
1076 else
1077 max_low_pfn = max_pfn;
1079 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1080 #endif
1083 * Find and reserve possible boot-time SMP configuration:
1085 find_smp_config();
1087 reserve_ibft_region();
1089 early_alloc_pgt_buf();
1092 * Need to conclude brk, before e820__memblock_setup()
1093 * it could use memblock_find_in_range, could overlap with
1094 * brk area.
1096 reserve_brk();
1098 cleanup_highmap();
1100 memblock_set_current_limit(ISA_END_ADDRESS);
1101 e820__memblock_setup();
1103 reserve_bios_regions();
1105 if (efi_enabled(EFI_MEMMAP)) {
1106 efi_fake_memmap();
1107 efi_find_mirror();
1108 efi_esrt_init();
1111 * The EFI specification says that boot service code won't be
1112 * called after ExitBootServices(). This is, in fact, a lie.
1114 efi_reserve_boot_services();
1117 /* preallocate 4k for mptable mpc */
1118 e820__memblock_alloc_reserved_mpc_new();
1120 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1121 setup_bios_corruption_check();
1122 #endif
1124 #ifdef CONFIG_X86_32
1125 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1126 (max_pfn_mapped<<PAGE_SHIFT) - 1);
1127 #endif
1129 reserve_real_mode();
1131 trim_platform_memory_ranges();
1132 trim_low_memory_range();
1134 init_mem_mapping();
1136 idt_setup_early_pf();
1139 * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
1140 * with the current CR4 value. This may not be necessary, but
1141 * auditing all the early-boot CR4 manipulation would be needed to
1142 * rule it out.
1144 * Mask off features that don't work outside long mode (just
1145 * PCIDE for now).
1147 mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE;
1149 memblock_set_current_limit(get_max_mapped());
1152 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1155 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1156 if (init_ohci1394_dma_early)
1157 init_ohci1394_dma_on_all_controllers();
1158 #endif
1159 /* Allocate bigger log buffer */
1160 setup_log_buf(1);
1162 if (efi_enabled(EFI_BOOT)) {
1163 switch (boot_params.secure_boot) {
1164 case efi_secureboot_mode_disabled:
1165 pr_info("Secure boot disabled\n");
1166 break;
1167 case efi_secureboot_mode_enabled:
1168 pr_info("Secure boot enabled\n");
1169 break;
1170 default:
1171 pr_info("Secure boot could not be determined\n");
1172 break;
1176 reserve_initrd();
1178 acpi_table_upgrade();
1180 vsmp_init();
1182 io_delay_init();
1184 early_platform_quirks();
1187 * Parse the ACPI tables for possible boot-time SMP configuration.
1189 acpi_boot_table_init();
1191 early_acpi_boot_init();
1193 initmem_init();
1194 dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
1197 * Reserve memory for crash kernel after SRAT is parsed so that it
1198 * won't consume hotpluggable memory.
1200 reserve_crashkernel();
1202 memblock_find_dma_reserve();
1204 if (!early_xdbc_setup_hardware())
1205 early_xdbc_register_console();
1207 x86_init.paging.pagetable_init();
1209 kasan_init();
1212 * Sync back kernel address range.
1214 * FIXME: Can the later sync in setup_cpu_entry_areas() replace
1215 * this call?
1217 sync_initial_page_table();
1219 tboot_probe();
1221 map_vsyscall();
1223 generic_apic_probe();
1225 early_quirks();
1228 * Read APIC and some other early information from ACPI tables.
1230 acpi_boot_init();
1231 sfi_init();
1232 x86_dtb_init();
1235 * get boot-time SMP configuration:
1237 get_smp_config();
1240 * Systems w/o ACPI and mptables might not have it mapped the local
1241 * APIC yet, but prefill_possible_map() might need to access it.
1243 init_apic_mappings();
1245 prefill_possible_map();
1247 init_cpu_to_node();
1249 io_apic_init_mappings();
1251 x86_init.hyper.guest_late_init();
1253 e820__reserve_resources();
1254 e820__register_nosave_regions(max_pfn);
1256 x86_init.resources.reserve_resources();
1258 e820__setup_pci_gap();
1260 #ifdef CONFIG_VT
1261 #if defined(CONFIG_VGA_CONSOLE)
1262 if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1263 conswitchp = &vga_con;
1264 #elif defined(CONFIG_DUMMY_CONSOLE)
1265 conswitchp = &dummy_con;
1266 #endif
1267 #endif
1268 x86_init.oem.banner();
1270 x86_init.timers.wallclock_init();
1272 mcheck_init();
1274 register_refined_jiffies(CLOCK_TICK_RATE);
1276 #ifdef CONFIG_EFI
1277 if (efi_enabled(EFI_BOOT))
1278 efi_apply_memmap_quirks();
1279 #endif
1281 unwind_init();
1284 #ifdef CONFIG_X86_32
1286 static struct resource video_ram_resource = {
1287 .name = "Video RAM area",
1288 .start = 0xa0000,
1289 .end = 0xbffff,
1290 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1293 void __init i386_reserve_resources(void)
1295 request_resource(&iomem_resource, &video_ram_resource);
1296 reserve_standard_io_resources();
1299 #endif /* CONFIG_X86_32 */
1301 static struct notifier_block kernel_offset_notifier = {
1302 .notifier_call = dump_kernel_offset
1305 static int __init register_kernel_offset_dumper(void)
1307 atomic_notifier_chain_register(&panic_notifier_list,
1308 &kernel_offset_notifier);
1309 return 0;
1311 __initcall(register_kernel_offset_dumper);