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Linux/arch/x86/kernel/setup.c

  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/memblock.h>
 35 #include <linux/seq_file.h>
 36 #include <linux/console.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 #include <linux/dma-contiguous.h>
 53 
 54 #include <linux/errno.h>
 55 #include <linux/kernel.h>
 56 #include <linux/stddef.h>
 57 #include <linux/unistd.h>
 58 #include <linux/ptrace.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 #include <linux/jiffies.h>
 72 
 73 #include <video/edid.h>
 74 
 75 #include <asm/mtrr.h>
 76 #include <asm/apic.h>
 77 #include <asm/realmode.h>
 78 #include <asm/e820.h>
 79 #include <asm/mpspec.h>
 80 #include <asm/setup.h>
 81 #include <asm/efi.h>
 82 #include <asm/timer.h>
 83 #include <asm/i8259.h>
 84 #include <asm/sections.h>
 85 #include <asm/io_apic.h>
 86 #include <asm/ist.h>
 87 #include <asm/setup_arch.h>
 88 #include <asm/bios_ebda.h>
 89 #include <asm/cacheflush.h>
 90 #include <asm/processor.h>
 91 #include <asm/bugs.h>
 92 
 93 #include <asm/vsyscall.h>
 94 #include <asm/cpu.h>
 95 #include <asm/desc.h>
 96 #include <asm/dma.h>
 97 #include <asm/iommu.h>
 98 #include <asm/gart.h>
 99 #include <asm/mmu_context.h>
100 #include <asm/proto.h>
101 
102 #include <asm/paravirt.h>
103 #include <asm/hypervisor.h>
104 #include <asm/olpc_ofw.h>
105 
106 #include <asm/percpu.h>
107 #include <asm/topology.h>
108 #include <asm/apicdef.h>
109 #include <asm/amd_nb.h>
110 #include <asm/mce.h>
111 #include <asm/alternative.h>
112 #include <asm/prom.h>
113 
114 /*
115  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
116  * max_pfn_mapped:     highest direct mapped pfn over 4GB
117  *
118  * The direct mapping only covers E820_RAM regions, so the ranges and gaps are
119  * represented by pfn_mapped
120  */
121 unsigned long max_low_pfn_mapped;
122 unsigned long max_pfn_mapped;
123 
124 #ifdef CONFIG_DMI
125 RESERVE_BRK(dmi_alloc, 65536);
126 #endif
127 
128 
129 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
130 unsigned long _brk_end = (unsigned long)__brk_base;
131 
132 #ifdef CONFIG_X86_64
133 int default_cpu_present_to_apicid(int mps_cpu)
134 {
135         return __default_cpu_present_to_apicid(mps_cpu);
136 }
137 
138 int default_check_phys_apicid_present(int phys_apicid)
139 {
140         return __default_check_phys_apicid_present(phys_apicid);
141 }
142 #endif
143 
144 struct boot_params boot_params;
145 
146 /*
147  * Machine setup..
148  */
149 static struct resource data_resource = {
150         .name   = "Kernel data",
151         .start  = 0,
152         .end    = 0,
153         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
154 };
155 
156 static struct resource code_resource = {
157         .name   = "Kernel code",
158         .start  = 0,
159         .end    = 0,
160         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
161 };
162 
163 static struct resource bss_resource = {
164         .name   = "Kernel bss",
165         .start  = 0,
166         .end    = 0,
167         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
168 };
169 
170 
171 #ifdef CONFIG_X86_32
172 /* cpu data as detected by the assembly code in head.S */
173 struct cpuinfo_x86 new_cpu_data = {
174         .wp_works_ok = -1,
175 };
176 /* common cpu data for all cpus */
177 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
178         .wp_works_ok = -1,
179 };
180 EXPORT_SYMBOL(boot_cpu_data);
181 
182 unsigned int def_to_bigsmp;
183 
184 /* for MCA, but anyone else can use it if they want */
185 unsigned int machine_id;
186 unsigned int machine_submodel_id;
187 unsigned int BIOS_revision;
188 
189 struct apm_info apm_info;
190 EXPORT_SYMBOL(apm_info);
191 
192 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
193         defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
194 struct ist_info ist_info;
195 EXPORT_SYMBOL(ist_info);
196 #else
197 struct ist_info ist_info;
198 #endif
199 
200 #else
201 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
202         .x86_phys_bits = MAX_PHYSMEM_BITS,
203 };
204 EXPORT_SYMBOL(boot_cpu_data);
205 #endif
206 
207 
208 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
209 __visible unsigned long mmu_cr4_features;
210 #else
211 __visible unsigned long mmu_cr4_features = X86_CR4_PAE;
212 #endif
213 
214 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
215 int bootloader_type, bootloader_version;
216 
217 /*
218  * Setup options
219  */
220 struct screen_info screen_info;
221 EXPORT_SYMBOL(screen_info);
222 struct edid_info edid_info;
223 EXPORT_SYMBOL_GPL(edid_info);
224 
225 extern int root_mountflags;
226 
227 unsigned long saved_video_mode;
228 
229 #define RAMDISK_IMAGE_START_MASK        0x07FF
230 #define RAMDISK_PROMPT_FLAG             0x8000
231 #define RAMDISK_LOAD_FLAG               0x4000
232 
233 static char __initdata command_line[COMMAND_LINE_SIZE];
234 #ifdef CONFIG_CMDLINE_BOOL
235 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
236 #endif
237 
238 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
239 struct edd edd;
240 #ifdef CONFIG_EDD_MODULE
241 EXPORT_SYMBOL(edd);
242 #endif
243 /**
244  * copy_edd() - Copy the BIOS EDD information
245  *              from boot_params into a safe place.
246  *
247  */
248 static inline void __init copy_edd(void)
249 {
250      memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
251             sizeof(edd.mbr_signature));
252      memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
253      edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
254      edd.edd_info_nr = boot_params.eddbuf_entries;
255 }
256 #else
257 static inline void __init copy_edd(void)
258 {
259 }
260 #endif
261 
262 void * __init extend_brk(size_t size, size_t align)
263 {
264         size_t mask = align - 1;
265         void *ret;
266 
267         BUG_ON(_brk_start == 0);
268         BUG_ON(align & mask);
269 
270         _brk_end = (_brk_end + mask) & ~mask;
271         BUG_ON((char *)(_brk_end + size) > __brk_limit);
272 
273         ret = (void *)_brk_end;
274         _brk_end += size;
275 
276         memset(ret, 0, size);
277 
278         return ret;
279 }
280 
281 #ifdef CONFIG_X86_32
282 static void __init cleanup_highmap(void)
283 {
284 }
285 #endif
286 
287 static void __init reserve_brk(void)
288 {
289         if (_brk_end > _brk_start)
290                 memblock_reserve(__pa_symbol(_brk_start),
291                                  _brk_end - _brk_start);
292 
293         /* Mark brk area as locked down and no longer taking any
294            new allocations */
295         _brk_start = 0;
296 }
297 
298 u64 relocated_ramdisk;
299 
300 #ifdef CONFIG_BLK_DEV_INITRD
301 
302 static u64 __init get_ramdisk_image(void)
303 {
304         u64 ramdisk_image = boot_params.hdr.ramdisk_image;
305 
306         ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
307 
308         return ramdisk_image;
309 }
310 static u64 __init get_ramdisk_size(void)
311 {
312         u64 ramdisk_size = boot_params.hdr.ramdisk_size;
313 
314         ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
315 
316         return ramdisk_size;
317 }
318 
319 #define MAX_MAP_CHUNK   (NR_FIX_BTMAPS << PAGE_SHIFT)
320 static void __init relocate_initrd(void)
321 {
322         /* Assume only end is not page aligned */
323         u64 ramdisk_image = get_ramdisk_image();
324         u64 ramdisk_size  = get_ramdisk_size();
325         u64 area_size     = PAGE_ALIGN(ramdisk_size);
326         unsigned long slop, clen, mapaddr;
327         char *p, *q;
328 
329         /* We need to move the initrd down into directly mapped mem */
330         relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
331                                                    area_size, PAGE_SIZE);
332 
333         if (!relocated_ramdisk)
334                 panic("Cannot find place for new RAMDISK of size %lld\n",
335                       ramdisk_size);
336 
337         /* Note: this includes all the mem currently occupied by
338            the initrd, we rely on that fact to keep the data intact. */
339         memblock_reserve(relocated_ramdisk, area_size);
340         initrd_start = relocated_ramdisk + PAGE_OFFSET;
341         initrd_end   = initrd_start + ramdisk_size;
342         printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
343                relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
344 
345         q = (char *)initrd_start;
346 
347         /* Copy the initrd */
348         while (ramdisk_size) {
349                 slop = ramdisk_image & ~PAGE_MASK;
350                 clen = ramdisk_size;
351                 if (clen > MAX_MAP_CHUNK-slop)
352                         clen = MAX_MAP_CHUNK-slop;
353                 mapaddr = ramdisk_image & PAGE_MASK;
354                 p = early_memremap(mapaddr, clen+slop);
355                 memcpy(q, p+slop, clen);
356                 early_iounmap(p, clen+slop);
357                 q += clen;
358                 ramdisk_image += clen;
359                 ramdisk_size  -= clen;
360         }
361 
362         ramdisk_image = get_ramdisk_image();
363         ramdisk_size  = get_ramdisk_size();
364         printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
365                 " [mem %#010llx-%#010llx]\n",
366                 ramdisk_image, ramdisk_image + ramdisk_size - 1,
367                 relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
368 }
369 
370 static void __init early_reserve_initrd(void)
371 {
372         /* Assume only end is not page aligned */
373         u64 ramdisk_image = get_ramdisk_image();
374         u64 ramdisk_size  = get_ramdisk_size();
375         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
376 
377         if (!boot_params.hdr.type_of_loader ||
378             !ramdisk_image || !ramdisk_size)
379                 return;         /* No initrd provided by bootloader */
380 
381         memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
382 }
383 static void __init reserve_initrd(void)
384 {
385         /* Assume only end is not page aligned */
386         u64 ramdisk_image = get_ramdisk_image();
387         u64 ramdisk_size  = get_ramdisk_size();
388         u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
389         u64 mapped_size;
390 
391         if (!boot_params.hdr.type_of_loader ||
392             !ramdisk_image || !ramdisk_size)
393                 return;         /* No initrd provided by bootloader */
394 
395         initrd_start = 0;
396 
397         mapped_size = memblock_mem_size(max_pfn_mapped);
398         if (ramdisk_size >= (mapped_size>>1))
399                 panic("initrd too large to handle, "
400                        "disabling initrd (%lld needed, %lld available)\n",
401                        ramdisk_size, mapped_size>>1);
402 
403         printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
404                         ramdisk_end - 1);
405 
406         if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
407                                 PFN_DOWN(ramdisk_end))) {
408                 /* All are mapped, easy case */
409                 initrd_start = ramdisk_image + PAGE_OFFSET;
410                 initrd_end = initrd_start + ramdisk_size;
411                 return;
412         }
413 
414         relocate_initrd();
415 
416         memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
417 }
418 #else
419 static void __init early_reserve_initrd(void)
420 {
421 }
422 static void __init reserve_initrd(void)
423 {
424 }
425 #endif /* CONFIG_BLK_DEV_INITRD */
426 
427 static void __init parse_setup_data(void)
428 {
429         struct setup_data *data;
430         u64 pa_data, pa_next;
431 
432         pa_data = boot_params.hdr.setup_data;
433         while (pa_data) {
434                 u32 data_len, map_len, data_type;
435 
436                 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
437                               (u64)sizeof(struct setup_data));
438                 data = early_memremap(pa_data, map_len);
439                 data_len = data->len + sizeof(struct setup_data);
440                 data_type = data->type;
441                 pa_next = data->next;
442                 early_iounmap(data, map_len);
443 
444                 switch (data_type) {
445                 case SETUP_E820_EXT:
446                         parse_e820_ext(pa_data, data_len);
447                         break;
448                 case SETUP_DTB:
449                         add_dtb(pa_data);
450                         break;
451                 case SETUP_EFI:
452                         parse_efi_setup(pa_data, data_len);
453                         break;
454                 default:
455                         break;
456                 }
457                 pa_data = pa_next;
458         }
459 }
460 
461 static void __init e820_reserve_setup_data(void)
462 {
463         struct setup_data *data;
464         u64 pa_data;
465         int found = 0;
466 
467         pa_data = boot_params.hdr.setup_data;
468         while (pa_data) {
469                 data = early_memremap(pa_data, sizeof(*data));
470                 e820_update_range(pa_data, sizeof(*data)+data->len,
471                          E820_RAM, E820_RESERVED_KERN);
472                 found = 1;
473                 pa_data = data->next;
474                 early_iounmap(data, sizeof(*data));
475         }
476         if (!found)
477                 return;
478 
479         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
480         memcpy(&e820_saved, &e820, sizeof(struct e820map));
481         printk(KERN_INFO "extended physical RAM map:\n");
482         e820_print_map("reserve setup_data");
483 }
484 
485 static void __init memblock_x86_reserve_range_setup_data(void)
486 {
487         struct setup_data *data;
488         u64 pa_data;
489 
490         pa_data = boot_params.hdr.setup_data;
491         while (pa_data) {
492                 data = early_memremap(pa_data, sizeof(*data));
493                 memblock_reserve(pa_data, sizeof(*data) + data->len);
494                 pa_data = data->next;
495                 early_iounmap(data, sizeof(*data));
496         }
497 }
498 
499 /*
500  * --------- Crashkernel reservation ------------------------------
501  */
502 
503 #ifdef CONFIG_KEXEC
504 
505 /*
506  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
507  * would limit the kernel to the low 512 MiB due to mapping restrictions.
508  * On 64bit, old kexec-tools need to under 896MiB.
509  */
510 #ifdef CONFIG_X86_32
511 # define CRASH_KERNEL_ADDR_LOW_MAX      (512 << 20)
512 # define CRASH_KERNEL_ADDR_HIGH_MAX     (512 << 20)
513 #else
514 # define CRASH_KERNEL_ADDR_LOW_MAX      (896UL<<20)
515 # define CRASH_KERNEL_ADDR_HIGH_MAX     MAXMEM
516 #endif
517 
518 static void __init reserve_crashkernel_low(void)
519 {
520 #ifdef CONFIG_X86_64
521         const unsigned long long alignment = 16<<20;    /* 16M */
522         unsigned long long low_base = 0, low_size = 0;
523         unsigned long total_low_mem;
524         unsigned long long base;
525         bool auto_set = false;
526         int ret;
527 
528         total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT));
529         /* crashkernel=Y,low */
530         ret = parse_crashkernel_low(boot_command_line, total_low_mem,
531                                                 &low_size, &base);
532         if (ret != 0) {
533                 /*
534                  * two parts from lib/swiotlb.c:
535                  *      swiotlb size: user specified with swiotlb= or default.
536                  *      swiotlb overflow buffer: now is hardcoded to 32k.
537                  *              We round it to 8M for other buffers that
538                  *              may need to stay low too.
539                  */
540                 low_size = swiotlb_size_or_default() + (8UL<<20);
541                 auto_set = true;
542         } else {
543                 /* passed with crashkernel=0,low ? */
544                 if (!low_size)
545                         return;
546         }
547 
548         low_base = memblock_find_in_range(low_size, (1ULL<<32),
549                                         low_size, alignment);
550 
551         if (!low_base) {
552                 if (!auto_set)
553                         pr_info("crashkernel low reservation failed - No suitable area found.\n");
554 
555                 return;
556         }
557 
558         memblock_reserve(low_base, low_size);
559         pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
560                         (unsigned long)(low_size >> 20),
561                         (unsigned long)(low_base >> 20),
562                         (unsigned long)(total_low_mem >> 20));
563         crashk_low_res.start = low_base;
564         crashk_low_res.end   = low_base + low_size - 1;
565         insert_resource(&iomem_resource, &crashk_low_res);
566 #endif
567 }
568 
569 static void __init reserve_crashkernel(void)
570 {
571         const unsigned long long alignment = 16<<20;    /* 16M */
572         unsigned long long total_mem;
573         unsigned long long crash_size, crash_base;
574         bool high = false;
575         int ret;
576 
577         total_mem = memblock_phys_mem_size();
578 
579         /* crashkernel=XM */
580         ret = parse_crashkernel(boot_command_line, total_mem,
581                         &crash_size, &crash_base);
582         if (ret != 0 || crash_size <= 0) {
583                 /* crashkernel=X,high */
584                 ret = parse_crashkernel_high(boot_command_line, total_mem,
585                                 &crash_size, &crash_base);
586                 if (ret != 0 || crash_size <= 0)
587                         return;
588                 high = true;
589         }
590 
591         /* 0 means: find the address automatically */
592         if (crash_base <= 0) {
593                 /*
594                  *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
595                  */
596                 crash_base = memblock_find_in_range(alignment,
597                                         high ? CRASH_KERNEL_ADDR_HIGH_MAX :
598                                                CRASH_KERNEL_ADDR_LOW_MAX,
599                                         crash_size, alignment);
600 
601                 if (!crash_base) {
602                         pr_info("crashkernel reservation failed - No suitable area found.\n");
603                         return;
604                 }
605 
606         } else {
607                 unsigned long long start;
608 
609                 start = memblock_find_in_range(crash_base,
610                                  crash_base + crash_size, crash_size, 1<<20);
611                 if (start != crash_base) {
612                         pr_info("crashkernel reservation failed - memory is in use.\n");
613                         return;
614                 }
615         }
616         memblock_reserve(crash_base, crash_size);
617 
618         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
619                         "for crashkernel (System RAM: %ldMB)\n",
620                         (unsigned long)(crash_size >> 20),
621                         (unsigned long)(crash_base >> 20),
622                         (unsigned long)(total_mem >> 20));
623 
624         crashk_res.start = crash_base;
625         crashk_res.end   = crash_base + crash_size - 1;
626         insert_resource(&iomem_resource, &crashk_res);
627 
628         if (crash_base >= (1ULL<<32))
629                 reserve_crashkernel_low();
630 }
631 #else
632 static void __init reserve_crashkernel(void)
633 {
634 }
635 #endif
636 
637 static struct resource standard_io_resources[] = {
638         { .name = "dma1", .start = 0x00, .end = 0x1f,
639                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
640         { .name = "pic1", .start = 0x20, .end = 0x21,
641                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
642         { .name = "timer0", .start = 0x40, .end = 0x43,
643                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
644         { .name = "timer1", .start = 0x50, .end = 0x53,
645                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
646         { .name = "keyboard", .start = 0x60, .end = 0x60,
647                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
648         { .name = "keyboard", .start = 0x64, .end = 0x64,
649                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
650         { .name = "dma page reg", .start = 0x80, .end = 0x8f,
651                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
652         { .name = "pic2", .start = 0xa0, .end = 0xa1,
653                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
654         { .name = "dma2", .start = 0xc0, .end = 0xdf,
655                 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
656         { .name = "fpu", .start = 0xf0, .end = 0xff,
657                 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
658 };
659 
660 void __init reserve_standard_io_resources(void)
661 {
662         int i;
663 
664         /* request I/O space for devices used on all i[345]86 PCs */
665         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
666                 request_resource(&ioport_resource, &standard_io_resources[i]);
667 
668 }
669 
670 static __init void reserve_ibft_region(void)
671 {
672         unsigned long addr, size = 0;
673 
674         addr = find_ibft_region(&size);
675 
676         if (size)
677                 memblock_reserve(addr, size);
678 }
679 
680 static bool __init snb_gfx_workaround_needed(void)
681 {
682 #ifdef CONFIG_PCI
683         int i;
684         u16 vendor, devid;
685         static const __initconst u16 snb_ids[] = {
686                 0x0102,
687                 0x0112,
688                 0x0122,
689                 0x0106,
690                 0x0116,
691                 0x0126,
692                 0x010a,
693         };
694 
695         /* Assume no if something weird is going on with PCI */
696         if (!early_pci_allowed())
697                 return false;
698 
699         vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
700         if (vendor != 0x8086)
701                 return false;
702 
703         devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
704         for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
705                 if (devid == snb_ids[i])
706                         return true;
707 #endif
708 
709         return false;
710 }
711 
712 /*
713  * Sandy Bridge graphics has trouble with certain ranges, exclude
714  * them from allocation.
715  */
716 static void __init trim_snb_memory(void)
717 {
718         static const __initconst unsigned long bad_pages[] = {
719                 0x20050000,
720                 0x20110000,
721                 0x20130000,
722                 0x20138000,
723                 0x40004000,
724         };
725         int i;
726 
727         if (!snb_gfx_workaround_needed())
728                 return;
729 
730         printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
731 
732         /*
733          * Reserve all memory below the 1 MB mark that has not
734          * already been reserved.
735          */
736         memblock_reserve(0, 1<<20);
737         
738         for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
739                 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
740                         printk(KERN_WARNING "failed to reserve 0x%08lx\n",
741                                bad_pages[i]);
742         }
743 }
744 
745 /*
746  * Here we put platform-specific memory range workarounds, i.e.
747  * memory known to be corrupt or otherwise in need to be reserved on
748  * specific platforms.
749  *
750  * If this gets used more widely it could use a real dispatch mechanism.
751  */
752 static void __init trim_platform_memory_ranges(void)
753 {
754         trim_snb_memory();
755 }
756 
757 static void __init trim_bios_range(void)
758 {
759         /*
760          * A special case is the first 4Kb of memory;
761          * This is a BIOS owned area, not kernel ram, but generally
762          * not listed as such in the E820 table.
763          *
764          * This typically reserves additional memory (64KiB by default)
765          * since some BIOSes are known to corrupt low memory.  See the
766          * Kconfig help text for X86_RESERVE_LOW.
767          */
768         e820_update_range(0, PAGE_SIZE, E820_RAM, E820_RESERVED);
769 
770         /*
771          * special case: Some BIOSen report the PC BIOS
772          * area (640->1Mb) as ram even though it is not.
773          * take them out.
774          */
775         e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
776 
777         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
778 }
779 
780 /* called before trim_bios_range() to spare extra sanitize */
781 static void __init e820_add_kernel_range(void)
782 {
783         u64 start = __pa_symbol(_text);
784         u64 size = __pa_symbol(_end) - start;
785 
786         /*
787          * Complain if .text .data and .bss are not marked as E820_RAM and
788          * attempt to fix it by adding the range. We may have a confused BIOS,
789          * or the user may have used memmap=exactmap or memmap=xxM$yyM to
790          * exclude kernel range. If we really are running on top non-RAM,
791          * we will crash later anyways.
792          */
793         if (e820_all_mapped(start, start + size, E820_RAM))
794                 return;
795 
796         pr_warn(".text .data .bss are not marked as E820_RAM!\n");
797         e820_remove_range(start, size, E820_RAM, 0);
798         e820_add_region(start, size, E820_RAM);
799 }
800 
801 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
802 
803 static int __init parse_reservelow(char *p)
804 {
805         unsigned long long size;
806 
807         if (!p)
808                 return -EINVAL;
809 
810         size = memparse(p, &p);
811 
812         if (size < 4096)
813                 size = 4096;
814 
815         if (size > 640*1024)
816                 size = 640*1024;
817 
818         reserve_low = size;
819 
820         return 0;
821 }
822 
823 early_param("reservelow", parse_reservelow);
824 
825 static void __init trim_low_memory_range(void)
826 {
827         memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
828 }
829         
830 /*
831  * Dump out kernel offset information on panic.
832  */
833 static int
834 dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
835 {
836         pr_emerg("Kernel Offset: 0x%lx from 0x%lx "
837                  "(relocation range: 0x%lx-0x%lx)\n",
838                  (unsigned long)&_text - __START_KERNEL, __START_KERNEL,
839                  __START_KERNEL_map, MODULES_VADDR-1);
840 
841         return 0;
842 }
843 
844 /*
845  * Determine if we were loaded by an EFI loader.  If so, then we have also been
846  * passed the efi memmap, systab, etc., so we should use these data structures
847  * for initialization.  Note, the efi init code path is determined by the
848  * global efi_enabled. This allows the same kernel image to be used on existing
849  * systems (with a traditional BIOS) as well as on EFI systems.
850  */
851 /*
852  * setup_arch - architecture-specific boot-time initializations
853  *
854  * Note: On x86_64, fixmaps are ready for use even before this is called.
855  */
856 
857 void __init setup_arch(char **cmdline_p)
858 {
859         memblock_reserve(__pa_symbol(_text),
860                          (unsigned long)__bss_stop - (unsigned long)_text);
861 
862         early_reserve_initrd();
863 
864         /*
865          * At this point everything still needed from the boot loader
866          * or BIOS or kernel text should be early reserved or marked not
867          * RAM in e820. All other memory is free game.
868          */
869 
870 #ifdef CONFIG_X86_32
871         memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
872         visws_early_detect();
873 
874         /*
875          * copy kernel address range established so far and switch
876          * to the proper swapper page table
877          */
878         clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
879                         initial_page_table + KERNEL_PGD_BOUNDARY,
880                         KERNEL_PGD_PTRS);
881 
882         load_cr3(swapper_pg_dir);
883         __flush_tlb_all();
884 #else
885         printk(KERN_INFO "Command line: %s\n", boot_command_line);
886 #endif
887 
888         /*
889          * If we have OLPC OFW, we might end up relocating the fixmap due to
890          * reserve_top(), so do this before touching the ioremap area.
891          */
892         olpc_ofw_detect();
893 
894         early_trap_init();
895         early_cpu_init();
896         early_ioremap_init();
897 
898         setup_olpc_ofw_pgd();
899 
900         ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
901         screen_info = boot_params.screen_info;
902         edid_info = boot_params.edid_info;
903 #ifdef CONFIG_X86_32
904         apm_info.bios = boot_params.apm_bios_info;
905         ist_info = boot_params.ist_info;
906         if (boot_params.sys_desc_table.length != 0) {
907                 machine_id = boot_params.sys_desc_table.table[0];
908                 machine_submodel_id = boot_params.sys_desc_table.table[1];
909                 BIOS_revision = boot_params.sys_desc_table.table[2];
910         }
911 #endif
912         saved_video_mode = boot_params.hdr.vid_mode;
913         bootloader_type = boot_params.hdr.type_of_loader;
914         if ((bootloader_type >> 4) == 0xe) {
915                 bootloader_type &= 0xf;
916                 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
917         }
918         bootloader_version  = bootloader_type & 0xf;
919         bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
920 
921 #ifdef CONFIG_BLK_DEV_RAM
922         rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
923         rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
924         rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
925 #endif
926 #ifdef CONFIG_EFI
927         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
928                      "EL32", 4)) {
929                 set_bit(EFI_BOOT, &x86_efi_facility);
930         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
931                      "EL64", 4)) {
932                 set_bit(EFI_BOOT, &x86_efi_facility);
933                 set_bit(EFI_64BIT, &x86_efi_facility);
934         }
935 
936         if (efi_enabled(EFI_BOOT))
937                 efi_memblock_x86_reserve_range();
938 #endif
939 
940         x86_init.oem.arch_setup();
941 
942         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
943         setup_memory_map();
944         parse_setup_data();
945 
946         copy_edd();
947 
948         if (!boot_params.hdr.root_flags)
949                 root_mountflags &= ~MS_RDONLY;
950         init_mm.start_code = (unsigned long) _text;
951         init_mm.end_code = (unsigned long) _etext;
952         init_mm.end_data = (unsigned long) _edata;
953         init_mm.brk = _brk_end;
954 
955         code_resource.start = __pa_symbol(_text);
956         code_resource.end = __pa_symbol(_etext)-1;
957         data_resource.start = __pa_symbol(_etext);
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         strlcpy(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                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
971         }
972 #endif
973 #endif
974 
975         strlcpy(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()). It may then be called
982          * again from within noexec_setup() during parsing early parameters
983          * to honor the respective command line option.
984          */
985         x86_configure_nx();
986 
987         parse_early_param();
988 
989         x86_report_nx();
990 
991         /* after early param, so could get panic from serial */
992         memblock_x86_reserve_range_setup_data();
993 
994         if (acpi_mps_check()) {
995 #ifdef CONFIG_X86_LOCAL_APIC
996                 disable_apic = 1;
997 #endif
998                 setup_clear_cpu_cap(X86_FEATURE_APIC);
999         }
1000 
1001 #ifdef CONFIG_PCI
1002         if (pci_early_dump_regs)
1003                 early_dump_pci_devices();
1004 #endif
1005 
1006         /* update the e820_saved too */
1007         e820_reserve_setup_data();
1008         finish_e820_parsing();
1009 
1010         if (efi_enabled(EFI_BOOT))
1011                 efi_init();
1012 
1013         dmi_scan_machine();
1014         dmi_memdev_walk();
1015         dmi_set_dump_stack_arch_desc();
1016 
1017         /*
1018          * VMware detection requires dmi to be available, so this
1019          * needs to be done after dmi_scan_machine, for the BP.
1020          */
1021         init_hypervisor_platform();
1022 
1023         x86_init.resources.probe_roms();
1024 
1025         /* after parse_early_param, so could debug it */
1026         insert_resource(&iomem_resource, &code_resource);
1027         insert_resource(&iomem_resource, &data_resource);
1028         insert_resource(&iomem_resource, &bss_resource);
1029 
1030         e820_add_kernel_range();
1031         trim_bios_range();
1032 #ifdef CONFIG_X86_32
1033         if (ppro_with_ram_bug()) {
1034                 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
1035                                   E820_RESERVED);
1036                 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
1037                 printk(KERN_INFO "fixed physical RAM map:\n");
1038                 e820_print_map("bad_ppro");
1039         }
1040 #else
1041         early_gart_iommu_check();
1042 #endif
1043 
1044         /*
1045          * partially used pages are not usable - thus
1046          * we are rounding upwards:
1047          */
1048         max_pfn = e820_end_of_ram_pfn();
1049 
1050         /* update e820 for memory not covered by WB MTRRs */
1051         mtrr_bp_init();
1052         if (mtrr_trim_uncached_memory(max_pfn))
1053                 max_pfn = e820_end_of_ram_pfn();
1054 
1055 #ifdef CONFIG_X86_32
1056         /* max_low_pfn get updated here */
1057         find_low_pfn_range();
1058 #else
1059         check_x2apic();
1060 
1061         /* How many end-of-memory variables you have, grandma! */
1062         /* need this before calling reserve_initrd */
1063         if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
1064                 max_low_pfn = e820_end_of_low_ram_pfn();
1065         else
1066                 max_low_pfn = max_pfn;
1067 
1068         high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
1069 #endif
1070 
1071         /*
1072          * Find and reserve possible boot-time SMP configuration:
1073          */
1074         find_smp_config();
1075 
1076         reserve_ibft_region();
1077 
1078         early_alloc_pgt_buf();
1079 
1080         /*
1081          * Need to conclude brk, before memblock_x86_fill()
1082          *  it could use memblock_find_in_range, could overlap with
1083          *  brk area.
1084          */
1085         reserve_brk();
1086 
1087         cleanup_highmap();
1088 
1089         memblock_set_current_limit(ISA_END_ADDRESS);
1090         memblock_x86_fill();
1091 
1092         /*
1093          * The EFI specification says that boot service code won't be called
1094          * after ExitBootServices(). This is, in fact, a lie.
1095          */
1096         if (efi_enabled(EFI_MEMMAP))
1097                 efi_reserve_boot_services();
1098 
1099         /* preallocate 4k for mptable mpc */
1100         early_reserve_e820_mpc_new();
1101 
1102 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
1103         setup_bios_corruption_check();
1104 #endif
1105 
1106 #ifdef CONFIG_X86_32
1107         printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
1108                         (max_pfn_mapped<<PAGE_SHIFT) - 1);
1109 #endif
1110 
1111         reserve_real_mode();
1112 
1113         trim_platform_memory_ranges();
1114         trim_low_memory_range();
1115 
1116         init_mem_mapping();
1117 
1118         early_trap_pf_init();
1119 
1120         setup_real_mode();
1121 
1122         memblock_set_current_limit(get_max_mapped());
1123         dma_contiguous_reserve(0);
1124 
1125         /*
1126          * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1127          */
1128 
1129 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1130         if (init_ohci1394_dma_early)
1131                 init_ohci1394_dma_on_all_controllers();
1132 #endif
1133         /* Allocate bigger log buffer */
1134         setup_log_buf(1);
1135 
1136         reserve_initrd();
1137 
1138 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1139         acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1140 #endif
1141 
1142         vsmp_init();
1143 
1144         io_delay_init();
1145 
1146         /*
1147          * Parse the ACPI tables for possible boot-time SMP configuration.
1148          */
1149         acpi_boot_table_init();
1150 
1151         early_acpi_boot_init();
1152 
1153         initmem_init();
1154 
1155         /*
1156          * Reserve memory for crash kernel after SRAT is parsed so that it
1157          * won't consume hotpluggable memory.
1158          */
1159         reserve_crashkernel();
1160 
1161         memblock_find_dma_reserve();
1162 
1163 #ifdef CONFIG_KVM_GUEST
1164         kvmclock_init();
1165 #endif
1166 
1167         x86_init.paging.pagetable_init();
1168 
1169         if (boot_cpu_data.cpuid_level >= 0) {
1170                 /* A CPU has %cr4 if and only if it has CPUID */
1171                 mmu_cr4_features = read_cr4();
1172                 if (trampoline_cr4_features)
1173                         *trampoline_cr4_features = mmu_cr4_features;
1174         }
1175 
1176 #ifdef CONFIG_X86_32
1177         /* sync back kernel address range */
1178         clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1179                         swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
1180                         KERNEL_PGD_PTRS);
1181 #endif
1182 
1183         tboot_probe();
1184 
1185 #ifdef CONFIG_X86_64
1186         map_vsyscall();
1187 #endif
1188 
1189         generic_apic_probe();
1190 
1191         early_quirks();
1192 
1193         /*
1194          * Read APIC and some other early information from ACPI tables.
1195          */
1196         acpi_boot_init();
1197         sfi_init();
1198         x86_dtb_init();
1199 
1200         /*
1201          * get boot-time SMP configuration:
1202          */
1203         if (smp_found_config)
1204                 get_smp_config();
1205 
1206         prefill_possible_map();
1207 
1208         init_cpu_to_node();
1209 
1210         init_apic_mappings();
1211         if (x86_io_apic_ops.init)
1212                 x86_io_apic_ops.init();
1213 
1214         kvm_guest_init();
1215 
1216         e820_reserve_resources();
1217         e820_mark_nosave_regions(max_low_pfn);
1218 
1219         x86_init.resources.reserve_resources();
1220 
1221         e820_setup_gap();
1222 
1223 #ifdef CONFIG_VT
1224 #if defined(CONFIG_VGA_CONSOLE)
1225         if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1226                 conswitchp = &vga_con;
1227 #elif defined(CONFIG_DUMMY_CONSOLE)
1228         conswitchp = &dummy_con;
1229 #endif
1230 #endif
1231         x86_init.oem.banner();
1232 
1233         x86_init.timers.wallclock_init();
1234 
1235         mcheck_init();
1236 
1237         arch_init_ideal_nops();
1238 
1239         register_refined_jiffies(CLOCK_TICK_RATE);
1240 
1241 #ifdef CONFIG_EFI
1242         if (efi_enabled(EFI_BOOT))
1243                 efi_apply_memmap_quirks();
1244 #endif
1245 }
1246 
1247 #ifdef CONFIG_X86_32
1248 
1249 static struct resource video_ram_resource = {
1250         .name   = "Video RAM area",
1251         .start  = 0xa0000,
1252         .end    = 0xbffff,
1253         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
1254 };
1255 
1256 void __init i386_reserve_resources(void)
1257 {
1258         request_resource(&iomem_resource, &video_ram_resource);
1259         reserve_standard_io_resources();
1260 }
1261 
1262 #endif /* CONFIG_X86_32 */
1263 
1264 static struct notifier_block kernel_offset_notifier = {
1265         .notifier_call = dump_kernel_offset
1266 };
1267 
1268 static int __init register_kernel_offset_dumper(void)
1269 {
1270         atomic_notifier_chain_register(&panic_notifier_list,
1271                                         &kernel_offset_notifier);
1272         return 0;
1273 }
1274 __initcall(register_kernel_offset_dumper);
1275 

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