xref: /openbmc/linux/arch/x86/kernel/setup.c (revision b6dcefde)
1 /*
2  *  Copyright (C) 1995  Linus Torvalds
3  *
4  *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
5  *
6  *  Memory region support
7  *	David Parsons <orc@pell.chi.il.us>, July-August 1999
8  *
9  *  Added E820 sanitization routine (removes overlapping memory regions);
10  *  Brian Moyle <bmoyle@mvista.com>, February 2001
11  *
12  * Moved CPU detection code to cpu/${cpu}.c
13  *    Patrick Mochel <mochel@osdl.org>, March 2002
14  *
15  *  Provisions for empty E820 memory regions (reported by certain BIOSes).
16  *  Alex Achenbach <xela@slit.de>, December 2002.
17  *
18  */
19 
20 /*
21  * This file handles the architecture-dependent parts of initialization
22  */
23 
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/bootmem.h>
34 #include <linux/seq_file.h>
35 #include <linux/console.h>
36 #include <linux/mca.h>
37 #include <linux/root_dev.h>
38 #include <linux/highmem.h>
39 #include <linux/module.h>
40 #include <linux/efi.h>
41 #include <linux/init.h>
42 #include <linux/edd.h>
43 #include <linux/iscsi_ibft.h>
44 #include <linux/nodemask.h>
45 #include <linux/kexec.h>
46 #include <linux/dmi.h>
47 #include <linux/pfn.h>
48 #include <linux/pci.h>
49 #include <asm/pci-direct.h>
50 #include <linux/init_ohci1394_dma.h>
51 #include <linux/kvm_para.h>
52 
53 #include <linux/errno.h>
54 #include <linux/kernel.h>
55 #include <linux/stddef.h>
56 #include <linux/unistd.h>
57 #include <linux/ptrace.h>
58 #include <linux/slab.h>
59 #include <linux/user.h>
60 #include <linux/delay.h>
61 
62 #include <linux/kallsyms.h>
63 #include <linux/cpufreq.h>
64 #include <linux/dma-mapping.h>
65 #include <linux/ctype.h>
66 #include <linux/uaccess.h>
67 
68 #include <linux/percpu.h>
69 #include <linux/crash_dump.h>
70 #include <linux/tboot.h>
71 
72 #include <video/edid.h>
73 
74 #include <asm/mtrr.h>
75 #include <asm/apic.h>
76 #include <asm/trampoline.h>
77 #include <asm/e820.h>
78 #include <asm/mpspec.h>
79 #include <asm/setup.h>
80 #include <asm/efi.h>
81 #include <asm/timer.h>
82 #include <asm/i8259.h>
83 #include <asm/sections.h>
84 #include <asm/dmi.h>
85 #include <asm/io_apic.h>
86 #include <asm/ist.h>
87 #include <asm/vmi.h>
88 #include <asm/setup_arch.h>
89 #include <asm/bios_ebda.h>
90 #include <asm/cacheflush.h>
91 #include <asm/processor.h>
92 #include <asm/bugs.h>
93 
94 #include <asm/system.h>
95 #include <asm/vsyscall.h>
96 #include <asm/cpu.h>
97 #include <asm/desc.h>
98 #include <asm/dma.h>
99 #include <asm/iommu.h>
100 #include <asm/gart.h>
101 #include <asm/mmu_context.h>
102 #include <asm/proto.h>
103 
104 #include <asm/paravirt.h>
105 #include <asm/hypervisor.h>
106 
107 #include <asm/percpu.h>
108 #include <asm/topology.h>
109 #include <asm/apicdef.h>
110 #include <asm/k8.h>
111 #ifdef CONFIG_X86_64
112 #include <asm/numa_64.h>
113 #endif
114 #include <asm/mce.h>
115 
116 /*
117  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
118  * The direct mapping extends to max_pfn_mapped, so that we can directly access
119  * apertures, ACPI and other tables without having to play with fixmaps.
120  */
121 unsigned long max_low_pfn_mapped;
122 unsigned long max_pfn_mapped;
123 
124 RESERVE_BRK(dmi_alloc, 65536);
125 
126 unsigned int boot_cpu_id __read_mostly;
127 
128 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
129 unsigned long _brk_end = (unsigned long)__brk_base;
130 
131 #ifdef CONFIG_X86_64
132 int default_cpu_present_to_apicid(int mps_cpu)
133 {
134 	return __default_cpu_present_to_apicid(mps_cpu);
135 }
136 
137 int default_check_phys_apicid_present(int phys_apicid)
138 {
139 	return __default_check_phys_apicid_present(phys_apicid);
140 }
141 #endif
142 
143 #ifndef CONFIG_DEBUG_BOOT_PARAMS
144 struct boot_params __initdata boot_params;
145 #else
146 struct boot_params boot_params;
147 #endif
148 
149 /*
150  * Machine setup..
151  */
152 static struct resource data_resource = {
153 	.name	= "Kernel data",
154 	.start	= 0,
155 	.end	= 0,
156 	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
157 };
158 
159 static struct resource code_resource = {
160 	.name	= "Kernel code",
161 	.start	= 0,
162 	.end	= 0,
163 	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
164 };
165 
166 static struct resource bss_resource = {
167 	.name	= "Kernel bss",
168 	.start	= 0,
169 	.end	= 0,
170 	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
171 };
172 
173 
174 #ifdef CONFIG_X86_32
175 /* cpu data as detected by the assembly code in head.S */
176 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
177 /* common cpu data for all cpus */
178 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
179 EXPORT_SYMBOL(boot_cpu_data);
180 static void set_mca_bus(int x)
181 {
182 #ifdef CONFIG_MCA
183 	MCA_bus = x;
184 #endif
185 }
186 
187 unsigned int def_to_bigsmp;
188 
189 /* for MCA, but anyone else can use it if they want */
190 unsigned int machine_id;
191 unsigned int machine_submodel_id;
192 unsigned int BIOS_revision;
193 
194 struct apm_info apm_info;
195 EXPORT_SYMBOL(apm_info);
196 
197 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
198 	defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
199 struct ist_info ist_info;
200 EXPORT_SYMBOL(ist_info);
201 #else
202 struct ist_info ist_info;
203 #endif
204 
205 #else
206 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
207 	.x86_phys_bits = MAX_PHYSMEM_BITS,
208 };
209 EXPORT_SYMBOL(boot_cpu_data);
210 #endif
211 
212 
213 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
214 unsigned long mmu_cr4_features;
215 #else
216 unsigned long mmu_cr4_features = X86_CR4_PAE;
217 #endif
218 
219 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
220 int bootloader_type, bootloader_version;
221 
222 /*
223  * Setup options
224  */
225 struct screen_info screen_info;
226 EXPORT_SYMBOL(screen_info);
227 struct edid_info edid_info;
228 EXPORT_SYMBOL_GPL(edid_info);
229 
230 extern int root_mountflags;
231 
232 unsigned long saved_video_mode;
233 
234 #define RAMDISK_IMAGE_START_MASK	0x07FF
235 #define RAMDISK_PROMPT_FLAG		0x8000
236 #define RAMDISK_LOAD_FLAG		0x4000
237 
238 static char __initdata command_line[COMMAND_LINE_SIZE];
239 #ifdef CONFIG_CMDLINE_BOOL
240 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
241 #endif
242 
243 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
244 struct edd edd;
245 #ifdef CONFIG_EDD_MODULE
246 EXPORT_SYMBOL(edd);
247 #endif
248 /**
249  * copy_edd() - Copy the BIOS EDD information
250  *              from boot_params into a safe place.
251  *
252  */
253 static inline void __init copy_edd(void)
254 {
255      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
256 	    sizeof(edd.mbr_signature));
257      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
258      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
259      edd.edd_info_nr = boot_params.eddbuf_entries;
260 }
261 #else
262 static inline void __init copy_edd(void)
263 {
264 }
265 #endif
266 
267 void * __init extend_brk(size_t size, size_t align)
268 {
269 	size_t mask = align - 1;
270 	void *ret;
271 
272 	BUG_ON(_brk_start == 0);
273 	BUG_ON(align & mask);
274 
275 	_brk_end = (_brk_end + mask) & ~mask;
276 	BUG_ON((char *)(_brk_end + size) > __brk_limit);
277 
278 	ret = (void *)_brk_end;
279 	_brk_end += size;
280 
281 	memset(ret, 0, size);
282 
283 	return ret;
284 }
285 
286 #ifdef CONFIG_X86_64
287 static void __init init_gbpages(void)
288 {
289 	if (direct_gbpages && cpu_has_gbpages)
290 		printk(KERN_INFO "Using GB pages for direct mapping\n");
291 	else
292 		direct_gbpages = 0;
293 }
294 #else
295 static inline void init_gbpages(void)
296 {
297 }
298 #endif
299 
300 static void __init reserve_brk(void)
301 {
302 	if (_brk_end > _brk_start)
303 		reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");
304 
305 	/* Mark brk area as locked down and no longer taking any
306 	   new allocations */
307 	_brk_start = 0;
308 }
309 
310 #ifdef CONFIG_BLK_DEV_INITRD
311 
312 #define MAX_MAP_CHUNK	(NR_FIX_BTMAPS << PAGE_SHIFT)
313 static void __init relocate_initrd(void)
314 {
315 
316 	u64 ramdisk_image = boot_params.hdr.ramdisk_image;
317 	u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
318 	u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
319 	u64 ramdisk_here;
320 	unsigned long slop, clen, mapaddr;
321 	char *p, *q;
322 
323 	/* We need to move the initrd down into lowmem */
324 	ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
325 					 PAGE_SIZE);
326 
327 	if (ramdisk_here == -1ULL)
328 		panic("Cannot find place for new RAMDISK of size %lld\n",
329 			 ramdisk_size);
330 
331 	/* Note: this includes all the lowmem currently occupied by
332 	   the initrd, we rely on that fact to keep the data intact. */
333 	reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
334 			 "NEW RAMDISK");
335 	initrd_start = ramdisk_here + PAGE_OFFSET;
336 	initrd_end   = initrd_start + ramdisk_size;
337 	printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
338 			 ramdisk_here, ramdisk_here + ramdisk_size);
339 
340 	q = (char *)initrd_start;
341 
342 	/* Copy any lowmem portion of the initrd */
343 	if (ramdisk_image < end_of_lowmem) {
344 		clen = end_of_lowmem - ramdisk_image;
345 		p = (char *)__va(ramdisk_image);
346 		memcpy(q, p, clen);
347 		q += clen;
348 		ramdisk_image += clen;
349 		ramdisk_size  -= clen;
350 	}
351 
352 	/* Copy the highmem portion of the initrd */
353 	while (ramdisk_size) {
354 		slop = ramdisk_image & ~PAGE_MASK;
355 		clen = ramdisk_size;
356 		if (clen > MAX_MAP_CHUNK-slop)
357 			clen = MAX_MAP_CHUNK-slop;
358 		mapaddr = ramdisk_image & PAGE_MASK;
359 		p = early_memremap(mapaddr, clen+slop);
360 		memcpy(q, p+slop, clen);
361 		early_iounmap(p, clen+slop);
362 		q += clen;
363 		ramdisk_image += clen;
364 		ramdisk_size  -= clen;
365 	}
366 	/* high pages is not converted by early_res_to_bootmem */
367 	ramdisk_image = boot_params.hdr.ramdisk_image;
368 	ramdisk_size  = boot_params.hdr.ramdisk_size;
369 	printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
370 		" %08llx - %08llx\n",
371 		ramdisk_image, ramdisk_image + ramdisk_size - 1,
372 		ramdisk_here, ramdisk_here + ramdisk_size - 1);
373 }
374 
375 static void __init reserve_initrd(void)
376 {
377 	u64 ramdisk_image = boot_params.hdr.ramdisk_image;
378 	u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
379 	u64 ramdisk_end   = ramdisk_image + ramdisk_size;
380 	u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
381 
382 	if (!boot_params.hdr.type_of_loader ||
383 	    !ramdisk_image || !ramdisk_size)
384 		return;		/* No initrd provided by bootloader */
385 
386 	initrd_start = 0;
387 
388 	if (ramdisk_size >= (end_of_lowmem>>1)) {
389 		free_early(ramdisk_image, ramdisk_end);
390 		printk(KERN_ERR "initrd too large to handle, "
391 		       "disabling initrd\n");
392 		return;
393 	}
394 
395 	printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", ramdisk_image,
396 			ramdisk_end);
397 
398 
399 	if (ramdisk_end <= end_of_lowmem) {
400 		/* All in lowmem, easy case */
401 		/*
402 		 * don't need to reserve again, already reserved early
403 		 * in i386_start_kernel
404 		 */
405 		initrd_start = ramdisk_image + PAGE_OFFSET;
406 		initrd_end = initrd_start + ramdisk_size;
407 		return;
408 	}
409 
410 	relocate_initrd();
411 
412 	free_early(ramdisk_image, ramdisk_end);
413 }
414 #else
415 static void __init reserve_initrd(void)
416 {
417 }
418 #endif /* CONFIG_BLK_DEV_INITRD */
419 
420 static void __init parse_setup_data(void)
421 {
422 	struct setup_data *data;
423 	u64 pa_data;
424 
425 	if (boot_params.hdr.version < 0x0209)
426 		return;
427 	pa_data = boot_params.hdr.setup_data;
428 	while (pa_data) {
429 		data = early_memremap(pa_data, PAGE_SIZE);
430 		switch (data->type) {
431 		case SETUP_E820_EXT:
432 			parse_e820_ext(data, pa_data);
433 			break;
434 		default:
435 			break;
436 		}
437 		pa_data = data->next;
438 		early_iounmap(data, PAGE_SIZE);
439 	}
440 }
441 
442 static void __init e820_reserve_setup_data(void)
443 {
444 	struct setup_data *data;
445 	u64 pa_data;
446 	int found = 0;
447 
448 	if (boot_params.hdr.version < 0x0209)
449 		return;
450 	pa_data = boot_params.hdr.setup_data;
451 	while (pa_data) {
452 		data = early_memremap(pa_data, sizeof(*data));
453 		e820_update_range(pa_data, sizeof(*data)+data->len,
454 			 E820_RAM, E820_RESERVED_KERN);
455 		found = 1;
456 		pa_data = data->next;
457 		early_iounmap(data, sizeof(*data));
458 	}
459 	if (!found)
460 		return;
461 
462 	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
463 	memcpy(&e820_saved, &e820, sizeof(struct e820map));
464 	printk(KERN_INFO "extended physical RAM map:\n");
465 	e820_print_map("reserve setup_data");
466 }
467 
468 static void __init reserve_early_setup_data(void)
469 {
470 	struct setup_data *data;
471 	u64 pa_data;
472 	char buf[32];
473 
474 	if (boot_params.hdr.version < 0x0209)
475 		return;
476 	pa_data = boot_params.hdr.setup_data;
477 	while (pa_data) {
478 		data = early_memremap(pa_data, sizeof(*data));
479 		sprintf(buf, "setup data %x", data->type);
480 		reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
481 		pa_data = data->next;
482 		early_iounmap(data, sizeof(*data));
483 	}
484 }
485 
486 /*
487  * --------- Crashkernel reservation ------------------------------
488  */
489 
490 #ifdef CONFIG_KEXEC
491 
492 static inline unsigned long long get_total_mem(void)
493 {
494 	unsigned long long total;
495 
496 	total = max_pfn - min_low_pfn;
497 
498 	return total << PAGE_SHIFT;
499 }
500 
501 static void __init reserve_crashkernel(void)
502 {
503 	unsigned long long total_mem;
504 	unsigned long long crash_size, crash_base;
505 	int ret;
506 
507 	total_mem = get_total_mem();
508 
509 	ret = parse_crashkernel(boot_command_line, total_mem,
510 			&crash_size, &crash_base);
511 	if (ret != 0 || crash_size <= 0)
512 		return;
513 
514 	/* 0 means: find the address automatically */
515 	if (crash_base <= 0) {
516 		const unsigned long long alignment = 16<<20;	/* 16M */
517 
518 		crash_base = find_e820_area(alignment, ULONG_MAX, crash_size,
519 				 alignment);
520 		if (crash_base == -1ULL) {
521 			pr_info("crashkernel reservation failed - No suitable area found.\n");
522 			return;
523 		}
524 	} else {
525 		unsigned long long start;
526 
527 		start = find_e820_area(crash_base, ULONG_MAX, crash_size,
528 				 1<<20);
529 		if (start != crash_base) {
530 			pr_info("crashkernel reservation failed - memory is in use.\n");
531 			return;
532 		}
533 	}
534 	reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL");
535 
536 	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
537 			"for crashkernel (System RAM: %ldMB)\n",
538 			(unsigned long)(crash_size >> 20),
539 			(unsigned long)(crash_base >> 20),
540 			(unsigned long)(total_mem >> 20));
541 
542 	crashk_res.start = crash_base;
543 	crashk_res.end   = crash_base + crash_size - 1;
544 	insert_resource(&iomem_resource, &crashk_res);
545 }
546 #else
547 static void __init reserve_crashkernel(void)
548 {
549 }
550 #endif
551 
552 static struct resource standard_io_resources[] = {
553 	{ .name = "dma1", .start = 0x00, .end = 0x1f,
554 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
555 	{ .name = "pic1", .start = 0x20, .end = 0x21,
556 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
557 	{ .name = "timer0", .start = 0x40, .end = 0x43,
558 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
559 	{ .name = "timer1", .start = 0x50, .end = 0x53,
560 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
561 	{ .name = "keyboard", .start = 0x60, .end = 0x60,
562 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
563 	{ .name = "keyboard", .start = 0x64, .end = 0x64,
564 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
565 	{ .name = "dma page reg", .start = 0x80, .end = 0x8f,
566 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
567 	{ .name = "pic2", .start = 0xa0, .end = 0xa1,
568 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
569 	{ .name = "dma2", .start = 0xc0, .end = 0xdf,
570 		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
571 	{ .name = "fpu", .start = 0xf0, .end = 0xff,
572 		.flags = IORESOURCE_BUSY | IORESOURCE_IO }
573 };
574 
575 void __init reserve_standard_io_resources(void)
576 {
577 	int i;
578 
579 	/* request I/O space for devices used on all i[345]86 PCs */
580 	for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
581 		request_resource(&ioport_resource, &standard_io_resources[i]);
582 
583 }
584 
585 /*
586  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
587  * is_kdump_kernel() to determine if we are booting after a panic. Hence
588  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
589  */
590 
591 #ifdef CONFIG_CRASH_DUMP
592 /* elfcorehdr= specifies the location of elf core header
593  * stored by the crashed kernel. This option will be passed
594  * by kexec loader to the capture kernel.
595  */
596 static int __init setup_elfcorehdr(char *arg)
597 {
598 	char *end;
599 	if (!arg)
600 		return -EINVAL;
601 	elfcorehdr_addr = memparse(arg, &end);
602 	return end > arg ? 0 : -EINVAL;
603 }
604 early_param("elfcorehdr", setup_elfcorehdr);
605 #endif
606 
607 #ifdef CONFIG_X86_RESERVE_LOW_64K
608 static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
609 {
610 	printk(KERN_NOTICE
611 		"%s detected: BIOS may corrupt low RAM, working around it.\n",
612 		d->ident);
613 
614 	e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
615 	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
616 
617 	return 0;
618 }
619 #endif
620 
621 /* List of systems that have known low memory corruption BIOS problems */
622 static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
623 #ifdef CONFIG_X86_RESERVE_LOW_64K
624 	{
625 		.callback = dmi_low_memory_corruption,
626 		.ident = "AMI BIOS",
627 		.matches = {
628 			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
629 		},
630 	},
631 	{
632 		.callback = dmi_low_memory_corruption,
633 		.ident = "Phoenix BIOS",
634 		.matches = {
635 			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
636 		},
637 	},
638 	{
639 		.callback = dmi_low_memory_corruption,
640 		.ident = "Phoenix/MSC BIOS",
641 		.matches = {
642 			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix/MSC"),
643 		},
644 	},
645 	/*
646 	 * AMI BIOS with low memory corruption was found on Intel DG45ID and
647 	 * DG45FC boards.
648 	 * It has a different DMI_BIOS_VENDOR = "Intel Corp.", for now we will
649 	 * match only DMI_BOARD_NAME and see if there is more bad products
650 	 * with this vendor.
651 	 */
652 	{
653 		.callback = dmi_low_memory_corruption,
654 		.ident = "AMI BIOS",
655 		.matches = {
656 			DMI_MATCH(DMI_BOARD_NAME, "DG45ID"),
657 		},
658 	},
659 	{
660 		.callback = dmi_low_memory_corruption,
661 		.ident = "AMI BIOS",
662 		.matches = {
663 			DMI_MATCH(DMI_BOARD_NAME, "DG45FC"),
664 		},
665 	},
666 #endif
667 	{}
668 };
669 
670 /*
671  * Determine if we were loaded by an EFI loader.  If so, then we have also been
672  * passed the efi memmap, systab, etc., so we should use these data structures
673  * for initialization.  Note, the efi init code path is determined by the
674  * global efi_enabled. This allows the same kernel image to be used on existing
675  * systems (with a traditional BIOS) as well as on EFI systems.
676  */
677 /*
678  * setup_arch - architecture-specific boot-time initializations
679  *
680  * Note: On x86_64, fixmaps are ready for use even before this is called.
681  */
682 
683 void __init setup_arch(char **cmdline_p)
684 {
685 	int acpi = 0;
686 	int k8 = 0;
687 
688 #ifdef CONFIG_X86_32
689 	memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
690 	visws_early_detect();
691 #else
692 	printk(KERN_INFO "Command line: %s\n", boot_command_line);
693 #endif
694 
695 	/* VMI may relocate the fixmap; do this before touching ioremap area */
696 	vmi_init();
697 
698 	early_cpu_init();
699 	early_ioremap_init();
700 
701 	ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
702 	screen_info = boot_params.screen_info;
703 	edid_info = boot_params.edid_info;
704 #ifdef CONFIG_X86_32
705 	apm_info.bios = boot_params.apm_bios_info;
706 	ist_info = boot_params.ist_info;
707 	if (boot_params.sys_desc_table.length != 0) {
708 		set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
709 		machine_id = boot_params.sys_desc_table.table[0];
710 		machine_submodel_id = boot_params.sys_desc_table.table[1];
711 		BIOS_revision = boot_params.sys_desc_table.table[2];
712 	}
713 #endif
714 	saved_video_mode = boot_params.hdr.vid_mode;
715 	bootloader_type = boot_params.hdr.type_of_loader;
716 	if ((bootloader_type >> 4) == 0xe) {
717 		bootloader_type &= 0xf;
718 		bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
719 	}
720 	bootloader_version  = bootloader_type & 0xf;
721 	bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
722 
723 #ifdef CONFIG_BLK_DEV_RAM
724 	rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
725 	rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
726 	rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
727 #endif
728 #ifdef CONFIG_EFI
729 	if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
730 #ifdef CONFIG_X86_32
731 		     "EL32",
732 #else
733 		     "EL64",
734 #endif
735 	 4)) {
736 		efi_enabled = 1;
737 		efi_reserve_early();
738 	}
739 #endif
740 
741 	x86_init.oem.arch_setup();
742 
743 	setup_memory_map();
744 	parse_setup_data();
745 	/* update the e820_saved too */
746 	e820_reserve_setup_data();
747 
748 	copy_edd();
749 
750 	if (!boot_params.hdr.root_flags)
751 		root_mountflags &= ~MS_RDONLY;
752 	init_mm.start_code = (unsigned long) _text;
753 	init_mm.end_code = (unsigned long) _etext;
754 	init_mm.end_data = (unsigned long) _edata;
755 	init_mm.brk = _brk_end;
756 
757 	code_resource.start = virt_to_phys(_text);
758 	code_resource.end = virt_to_phys(_etext)-1;
759 	data_resource.start = virt_to_phys(_etext);
760 	data_resource.end = virt_to_phys(_edata)-1;
761 	bss_resource.start = virt_to_phys(&__bss_start);
762 	bss_resource.end = virt_to_phys(&__bss_stop)-1;
763 
764 #ifdef CONFIG_CMDLINE_BOOL
765 #ifdef CONFIG_CMDLINE_OVERRIDE
766 	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
767 #else
768 	if (builtin_cmdline[0]) {
769 		/* append boot loader cmdline to builtin */
770 		strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
771 		strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
772 		strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
773 	}
774 #endif
775 #endif
776 
777 	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
778 	*cmdline_p = command_line;
779 
780 	/*
781 	 * x86_configure_nx() is called before parse_early_param() to detect
782 	 * whether hardware doesn't support NX (so that the early EHCI debug
783 	 * console setup can safely call set_fixmap()). It may then be called
784 	 * again from within noexec_setup() during parsing early parameters
785 	 * to honor the respective command line option.
786 	 */
787 	x86_configure_nx();
788 
789 	parse_early_param();
790 
791 	x86_report_nx();
792 
793 	/* Must be before kernel pagetables are setup */
794 	vmi_activate();
795 
796 	/* after early param, so could get panic from serial */
797 	reserve_early_setup_data();
798 
799 	if (acpi_mps_check()) {
800 #ifdef CONFIG_X86_LOCAL_APIC
801 		disable_apic = 1;
802 #endif
803 		setup_clear_cpu_cap(X86_FEATURE_APIC);
804 	}
805 
806 #ifdef CONFIG_PCI
807 	if (pci_early_dump_regs)
808 		early_dump_pci_devices();
809 #endif
810 
811 	finish_e820_parsing();
812 
813 	if (efi_enabled)
814 		efi_init();
815 
816 	dmi_scan_machine();
817 
818 	dmi_check_system(bad_bios_dmi_table);
819 
820 	/*
821 	 * VMware detection requires dmi to be available, so this
822 	 * needs to be done after dmi_scan_machine, for the BP.
823 	 */
824 	init_hypervisor_platform();
825 
826 	x86_init.resources.probe_roms();
827 
828 	/* after parse_early_param, so could debug it */
829 	insert_resource(&iomem_resource, &code_resource);
830 	insert_resource(&iomem_resource, &data_resource);
831 	insert_resource(&iomem_resource, &bss_resource);
832 
833 
834 #ifdef CONFIG_X86_32
835 	if (ppro_with_ram_bug()) {
836 		e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
837 				  E820_RESERVED);
838 		sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
839 		printk(KERN_INFO "fixed physical RAM map:\n");
840 		e820_print_map("bad_ppro");
841 	}
842 #else
843 	early_gart_iommu_check();
844 #endif
845 
846 	/*
847 	 * partially used pages are not usable - thus
848 	 * we are rounding upwards:
849 	 */
850 	max_pfn = e820_end_of_ram_pfn();
851 
852 	/* preallocate 4k for mptable mpc */
853 	early_reserve_e820_mpc_new();
854 	/* update e820 for memory not covered by WB MTRRs */
855 	mtrr_bp_init();
856 	if (mtrr_trim_uncached_memory(max_pfn))
857 		max_pfn = e820_end_of_ram_pfn();
858 
859 #ifdef CONFIG_X86_32
860 	/* max_low_pfn get updated here */
861 	find_low_pfn_range();
862 #else
863 	num_physpages = max_pfn;
864 
865 	check_x2apic();
866 
867 	/* How many end-of-memory variables you have, grandma! */
868 	/* need this before calling reserve_initrd */
869 	if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
870 		max_low_pfn = e820_end_of_low_ram_pfn();
871 	else
872 		max_low_pfn = max_pfn;
873 
874 	high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
875 	max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
876 #endif
877 
878 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
879 	setup_bios_corruption_check();
880 #endif
881 
882 	printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
883 			max_pfn_mapped<<PAGE_SHIFT);
884 
885 	reserve_brk();
886 
887 	/*
888 	 * Find and reserve possible boot-time SMP configuration:
889 	 */
890 	find_smp_config();
891 
892 	reserve_trampoline_memory();
893 
894 #ifdef CONFIG_ACPI_SLEEP
895 	/*
896 	 * Reserve low memory region for sleep support.
897 	 * even before init_memory_mapping
898 	 */
899 	acpi_reserve_wakeup_memory();
900 #endif
901 	init_gbpages();
902 
903 	/* max_pfn_mapped is updated here */
904 	max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
905 	max_pfn_mapped = max_low_pfn_mapped;
906 
907 #ifdef CONFIG_X86_64
908 	if (max_pfn > max_low_pfn) {
909 		max_pfn_mapped = init_memory_mapping(1UL<<32,
910 						     max_pfn<<PAGE_SHIFT);
911 		/* can we preseve max_low_pfn ?*/
912 		max_low_pfn = max_pfn;
913 	}
914 #endif
915 
916 	/*
917 	 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
918 	 */
919 
920 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
921 	if (init_ohci1394_dma_early)
922 		init_ohci1394_dma_on_all_controllers();
923 #endif
924 
925 	reserve_initrd();
926 
927 	reserve_crashkernel();
928 
929 	vsmp_init();
930 
931 	io_delay_init();
932 
933 	/*
934 	 * Parse the ACPI tables for possible boot-time SMP configuration.
935 	 */
936 	acpi_boot_table_init();
937 
938 	early_acpi_boot_init();
939 
940 #ifdef CONFIG_ACPI_NUMA
941 	/*
942 	 * Parse SRAT to discover nodes.
943 	 */
944 	acpi = acpi_numa_init();
945 #endif
946 
947 #ifdef CONFIG_K8_NUMA
948 	if (!acpi)
949 		k8 = !k8_numa_init(0, max_pfn);
950 #endif
951 
952 	initmem_init(0, max_pfn, acpi, k8);
953 
954 #ifdef CONFIG_X86_64
955 	/*
956 	 * dma32_reserve_bootmem() allocates bootmem which may conflict
957 	 * with the crashkernel command line, so do that after
958 	 * reserve_crashkernel()
959 	 */
960 	dma32_reserve_bootmem();
961 #endif
962 
963 	reserve_ibft_region();
964 
965 #ifdef CONFIG_KVM_CLOCK
966 	kvmclock_init();
967 #endif
968 
969 	x86_init.paging.pagetable_setup_start(swapper_pg_dir);
970 	paging_init();
971 	x86_init.paging.pagetable_setup_done(swapper_pg_dir);
972 
973 	tboot_probe();
974 
975 #ifdef CONFIG_X86_64
976 	map_vsyscall();
977 #endif
978 
979 	generic_apic_probe();
980 
981 	early_quirks();
982 
983 	/*
984 	 * Read APIC and some other early information from ACPI tables.
985 	 */
986 	acpi_boot_init();
987 
988 	sfi_init();
989 
990 	/*
991 	 * get boot-time SMP configuration:
992 	 */
993 	if (smp_found_config)
994 		get_smp_config();
995 
996 	prefill_possible_map();
997 
998 #ifdef CONFIG_X86_64
999 	init_cpu_to_node();
1000 #endif
1001 
1002 	init_apic_mappings();
1003 	ioapic_init_mappings();
1004 
1005 	/* need to wait for io_apic is mapped */
1006 	probe_nr_irqs_gsi();
1007 
1008 	kvm_guest_init();
1009 
1010 	e820_reserve_resources();
1011 	e820_mark_nosave_regions(max_low_pfn);
1012 
1013 	x86_init.resources.reserve_resources();
1014 
1015 	e820_setup_gap();
1016 
1017 #ifdef CONFIG_VT
1018 #if defined(CONFIG_VGA_CONSOLE)
1019 	if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1020 		conswitchp = &vga_con;
1021 #elif defined(CONFIG_DUMMY_CONSOLE)
1022 	conswitchp = &dummy_con;
1023 #endif
1024 #endif
1025 	x86_init.oem.banner();
1026 
1027 	mcheck_init();
1028 }
1029 
1030 #ifdef CONFIG_X86_32
1031 
1032 static struct resource video_ram_resource = {
1033 	.name	= "Video RAM area",
1034 	.start	= 0xa0000,
1035 	.end	= 0xbffff,
1036 	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
1037 };
1038 
1039 void __init i386_reserve_resources(void)
1040 {
1041 	request_resource(&iomem_resource, &video_ram_resource);
1042 	reserve_standard_io_resources();
1043 }
1044 
1045 #endif /* CONFIG_X86_32 */
1046