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x86, boot: Sanitize boot_params if not zeroed on creation
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / 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/dmi.h>
86 #include <asm/io_apic.h>
87 #include <asm/ist.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/vsyscall.h>
95 #include <asm/cpu.h>
96 #include <asm/desc.h>
97 #include <asm/dma.h>
98 #include <asm/iommu.h>
99 #include <asm/gart.h>
100 #include <asm/mmu_context.h>
101 #include <asm/proto.h>
102
103 #include <asm/paravirt.h>
104 #include <asm/hypervisor.h>
105 #include <asm/olpc_ofw.h>
106
107 #include <asm/percpu.h>
108 #include <asm/topology.h>
109 #include <asm/apicdef.h>
110 #include <asm/amd_nb.h>
111 #ifdef CONFIG_X86_64
112 #include <asm/numa_64.h>
113 #endif
114 #include <asm/mce.h>
115 #include <asm/alternative.h>
116 #include <asm/prom.h>
117
118 /*
119 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
120 * The direct mapping extends to max_pfn_mapped, so that we can directly access
121 * apertures, ACPI and other tables without having to play with fixmaps.
122 */
123 unsigned long max_low_pfn_mapped;
124 unsigned long max_pfn_mapped;
125
126 #ifdef CONFIG_DMI
127 RESERVE_BRK(dmi_alloc, 65536);
128 #endif
129
130
131 static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
132 unsigned long _brk_end = (unsigned long)__brk_base;
133
134 #ifdef CONFIG_X86_64
135 int default_cpu_present_to_apicid(int mps_cpu)
136 {
137 return __default_cpu_present_to_apicid(mps_cpu);
138 }
139
140 int default_check_phys_apicid_present(int phys_apicid)
141 {
142 return __default_check_phys_apicid_present(phys_apicid);
143 }
144 #endif
145
146 struct boot_params boot_params;
147
148 /*
149 * Machine setup..
150 */
151 static struct resource data_resource = {
152 .name = "Kernel data",
153 .start = 0,
154 .end = 0,
155 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
156 };
157
158 static struct resource code_resource = {
159 .name = "Kernel code",
160 .start = 0,
161 .end = 0,
162 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
163 };
164
165 static struct resource bss_resource = {
166 .name = "Kernel bss",
167 .start = 0,
168 .end = 0,
169 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
170 };
171
172
173 #ifdef CONFIG_X86_32
174 /* cpu data as detected by the assembly code in head.S */
175 struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
176 /* common cpu data for all cpus */
177 struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
178 EXPORT_SYMBOL(boot_cpu_data);
179
180 unsigned int def_to_bigsmp;
181
182 /* for MCA, but anyone else can use it if they want */
183 unsigned int machine_id;
184 unsigned int machine_submodel_id;
185 unsigned int BIOS_revision;
186
187 struct apm_info apm_info;
188 EXPORT_SYMBOL(apm_info);
189
190 #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
191 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
192 struct ist_info ist_info;
193 EXPORT_SYMBOL(ist_info);
194 #else
195 struct ist_info ist_info;
196 #endif
197
198 #else
199 struct cpuinfo_x86 boot_cpu_data __read_mostly = {
200 .x86_phys_bits = MAX_PHYSMEM_BITS,
201 };
202 EXPORT_SYMBOL(boot_cpu_data);
203 #endif
204
205
206 #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
207 unsigned long mmu_cr4_features;
208 #else
209 unsigned long mmu_cr4_features = X86_CR4_PAE;
210 #endif
211
212 /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
213 int bootloader_type, bootloader_version;
214
215 /*
216 * Setup options
217 */
218 struct screen_info screen_info;
219 EXPORT_SYMBOL(screen_info);
220 struct edid_info edid_info;
221 EXPORT_SYMBOL_GPL(edid_info);
222
223 extern int root_mountflags;
224
225 unsigned long saved_video_mode;
226
227 #define RAMDISK_IMAGE_START_MASK 0x07FF
228 #define RAMDISK_PROMPT_FLAG 0x8000
229 #define RAMDISK_LOAD_FLAG 0x4000
230
231 static char __initdata command_line[COMMAND_LINE_SIZE];
232 #ifdef CONFIG_CMDLINE_BOOL
233 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
234 #endif
235
236 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
237 struct edd edd;
238 #ifdef CONFIG_EDD_MODULE
239 EXPORT_SYMBOL(edd);
240 #endif
241 /**
242 * copy_edd() - Copy the BIOS EDD information
243 * from boot_params into a safe place.
244 *
245 */
246 static inline void __init copy_edd(void)
247 {
248 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
249 sizeof(edd.mbr_signature));
250 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
251 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
252 edd.edd_info_nr = boot_params.eddbuf_entries;
253 }
254 #else
255 static inline void __init copy_edd(void)
256 {
257 }
258 #endif
259
260 void * __init extend_brk(size_t size, size_t align)
261 {
262 size_t mask = align - 1;
263 void *ret;
264
265 BUG_ON(_brk_start == 0);
266 BUG_ON(align & mask);
267
268 _brk_end = (_brk_end + mask) & ~mask;
269 BUG_ON((char *)(_brk_end + size) > __brk_limit);
270
271 ret = (void *)_brk_end;
272 _brk_end += size;
273
274 memset(ret, 0, size);
275
276 return ret;
277 }
278
279 #ifdef CONFIG_X86_64
280 static void __init init_gbpages(void)
281 {
282 if (direct_gbpages && cpu_has_gbpages)
283 printk(KERN_INFO "Using GB pages for direct mapping\n");
284 else
285 direct_gbpages = 0;
286 }
287 #else
288 static inline void init_gbpages(void)
289 {
290 }
291 static void __init cleanup_highmap(void)
292 {
293 }
294 #endif
295
296 static void __init reserve_brk(void)
297 {
298 if (_brk_end > _brk_start)
299 memblock_reserve(__pa(_brk_start),
300 __pa(_brk_end) - __pa(_brk_start));
301
302 /* Mark brk area as locked down and no longer taking any
303 new allocations */
304 _brk_start = 0;
305 }
306
307 #ifdef CONFIG_BLK_DEV_INITRD
308
309 #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
310 static void __init relocate_initrd(void)
311 {
312 /* Assume only end is not page aligned */
313 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
314 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
315 u64 area_size = PAGE_ALIGN(ramdisk_size);
316 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
317 u64 ramdisk_here;
318 unsigned long slop, clen, mapaddr;
319 char *p, *q;
320
321 /* We need to move the initrd down into lowmem */
322 ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size,
323 PAGE_SIZE);
324
325 if (!ramdisk_here)
326 panic("Cannot find place for new RAMDISK of size %lld\n",
327 ramdisk_size);
328
329 /* Note: this includes all the lowmem currently occupied by
330 the initrd, we rely on that fact to keep the data intact. */
331 memblock_reserve(ramdisk_here, area_size);
332 initrd_start = ramdisk_here + PAGE_OFFSET;
333 initrd_end = initrd_start + ramdisk_size;
334 printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
335 ramdisk_here, ramdisk_here + ramdisk_size - 1);
336
337 q = (char *)initrd_start;
338
339 /* Copy any lowmem portion of the initrd */
340 if (ramdisk_image < end_of_lowmem) {
341 clen = end_of_lowmem - ramdisk_image;
342 p = (char *)__va(ramdisk_image);
343 memcpy(q, p, clen);
344 q += clen;
345 ramdisk_image += clen;
346 ramdisk_size -= clen;
347 }
348
349 /* Copy the highmem portion of the initrd */
350 while (ramdisk_size) {
351 slop = ramdisk_image & ~PAGE_MASK;
352 clen = ramdisk_size;
353 if (clen > MAX_MAP_CHUNK-slop)
354 clen = MAX_MAP_CHUNK-slop;
355 mapaddr = ramdisk_image & PAGE_MASK;
356 p = early_memremap(mapaddr, clen+slop);
357 memcpy(q, p+slop, clen);
358 early_iounmap(p, clen+slop);
359 q += clen;
360 ramdisk_image += clen;
361 ramdisk_size -= clen;
362 }
363 /* high pages is not converted by early_res_to_bootmem */
364 ramdisk_image = boot_params.hdr.ramdisk_image;
365 ramdisk_size = boot_params.hdr.ramdisk_size;
366 printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
367 " [mem %#010llx-%#010llx]\n",
368 ramdisk_image, ramdisk_image + ramdisk_size - 1,
369 ramdisk_here, ramdisk_here + ramdisk_size - 1);
370 }
371
372 static void __init reserve_initrd(void)
373 {
374 /* Assume only end is not page aligned */
375 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
376 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
377 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
378 u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;
379
380 if (!boot_params.hdr.type_of_loader ||
381 !ramdisk_image || !ramdisk_size)
382 return; /* No initrd provided by bootloader */
383
384 initrd_start = 0;
385
386 if (ramdisk_size >= (end_of_lowmem>>1)) {
387 panic("initrd too large to handle, "
388 "disabling initrd (%lld needed, %lld available)\n",
389 ramdisk_size, end_of_lowmem>>1);
390 }
391
392 printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
393 ramdisk_end - 1);
394
395
396 if (ramdisk_end <= end_of_lowmem) {
397 /* All in lowmem, easy case */
398 /*
399 * don't need to reserve again, already reserved early
400 * in i386_start_kernel
401 */
402 initrd_start = ramdisk_image + PAGE_OFFSET;
403 initrd_end = initrd_start + ramdisk_size;
404 return;
405 }
406
407 relocate_initrd();
408
409 memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
410 }
411 #else
412 static void __init reserve_initrd(void)
413 {
414 }
415 #endif /* CONFIG_BLK_DEV_INITRD */
416
417 static void __init parse_setup_data(void)
418 {
419 struct setup_data *data;
420 u64 pa_data;
421
422 if (boot_params.hdr.version < 0x0209)
423 return;
424 pa_data = boot_params.hdr.setup_data;
425 while (pa_data) {
426 u32 data_len, map_len;
427
428 map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
429 (u64)sizeof(struct setup_data));
430 data = early_memremap(pa_data, map_len);
431 data_len = data->len + sizeof(struct setup_data);
432 if (data_len > map_len) {
433 early_iounmap(data, map_len);
434 data = early_memremap(pa_data, data_len);
435 map_len = data_len;
436 }
437
438 switch (data->type) {
439 case SETUP_E820_EXT:
440 parse_e820_ext(data);
441 break;
442 case SETUP_DTB:
443 add_dtb(pa_data);
444 break;
445 default:
446 break;
447 }
448 pa_data = data->next;
449 early_iounmap(data, map_len);
450 }
451 }
452
453 static void __init e820_reserve_setup_data(void)
454 {
455 struct setup_data *data;
456 u64 pa_data;
457 int found = 0;
458
459 if (boot_params.hdr.version < 0x0209)
460 return;
461 pa_data = boot_params.hdr.setup_data;
462 while (pa_data) {
463 data = early_memremap(pa_data, sizeof(*data));
464 e820_update_range(pa_data, sizeof(*data)+data->len,
465 E820_RAM, E820_RESERVED_KERN);
466 found = 1;
467 pa_data = data->next;
468 early_iounmap(data, sizeof(*data));
469 }
470 if (!found)
471 return;
472
473 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
474 memcpy(&e820_saved, &e820, sizeof(struct e820map));
475 printk(KERN_INFO "extended physical RAM map:\n");
476 e820_print_map("reserve setup_data");
477 }
478
479 static void __init memblock_x86_reserve_range_setup_data(void)
480 {
481 struct setup_data *data;
482 u64 pa_data;
483
484 if (boot_params.hdr.version < 0x0209)
485 return;
486 pa_data = boot_params.hdr.setup_data;
487 while (pa_data) {
488 data = early_memremap(pa_data, sizeof(*data));
489 memblock_reserve(pa_data, sizeof(*data) + data->len);
490 pa_data = data->next;
491 early_iounmap(data, sizeof(*data));
492 }
493 }
494
495 /*
496 * --------- Crashkernel reservation ------------------------------
497 */
498
499 #ifdef CONFIG_KEXEC
500
501 /*
502 * Keep the crash kernel below this limit. On 32 bits earlier kernels
503 * would limit the kernel to the low 512 MiB due to mapping restrictions.
504 * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
505 * limit once kexec-tools are fixed.
506 */
507 #ifdef CONFIG_X86_32
508 # define CRASH_KERNEL_ADDR_MAX (512 << 20)
509 #else
510 # define CRASH_KERNEL_ADDR_MAX (896 << 20)
511 #endif
512
513 static void __init reserve_crashkernel(void)
514 {
515 unsigned long long total_mem;
516 unsigned long long crash_size, crash_base;
517 int ret;
518
519 total_mem = memblock_phys_mem_size();
520
521 ret = parse_crashkernel(boot_command_line, total_mem,
522 &crash_size, &crash_base);
523 if (ret != 0 || crash_size <= 0)
524 return;
525
526 /* 0 means: find the address automatically */
527 if (crash_base <= 0) {
528 const unsigned long long alignment = 16<<20; /* 16M */
529
530 /*
531 * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
532 */
533 crash_base = memblock_find_in_range(alignment,
534 CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
535
536 if (!crash_base) {
537 pr_info("crashkernel reservation failed - No suitable area found.\n");
538 return;
539 }
540 } else {
541 unsigned long long start;
542
543 start = memblock_find_in_range(crash_base,
544 crash_base + crash_size, crash_size, 1<<20);
545 if (start != crash_base) {
546 pr_info("crashkernel reservation failed - memory is in use.\n");
547 return;
548 }
549 }
550 memblock_reserve(crash_base, crash_size);
551
552 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
553 "for crashkernel (System RAM: %ldMB)\n",
554 (unsigned long)(crash_size >> 20),
555 (unsigned long)(crash_base >> 20),
556 (unsigned long)(total_mem >> 20));
557
558 crashk_res.start = crash_base;
559 crashk_res.end = crash_base + crash_size - 1;
560 insert_resource(&iomem_resource, &crashk_res);
561 }
562 #else
563 static void __init reserve_crashkernel(void)
564 {
565 }
566 #endif
567
568 static struct resource standard_io_resources[] = {
569 { .name = "dma1", .start = 0x00, .end = 0x1f,
570 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
571 { .name = "pic1", .start = 0x20, .end = 0x21,
572 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
573 { .name = "timer0", .start = 0x40, .end = 0x43,
574 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
575 { .name = "timer1", .start = 0x50, .end = 0x53,
576 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
577 { .name = "keyboard", .start = 0x60, .end = 0x60,
578 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
579 { .name = "keyboard", .start = 0x64, .end = 0x64,
580 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
581 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
582 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
583 { .name = "pic2", .start = 0xa0, .end = 0xa1,
584 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
585 { .name = "dma2", .start = 0xc0, .end = 0xdf,
586 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
587 { .name = "fpu", .start = 0xf0, .end = 0xff,
588 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
589 };
590
591 void __init reserve_standard_io_resources(void)
592 {
593 int i;
594
595 /* request I/O space for devices used on all i[345]86 PCs */
596 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
597 request_resource(&ioport_resource, &standard_io_resources[i]);
598
599 }
600
601 static __init void reserve_ibft_region(void)
602 {
603 unsigned long addr, size = 0;
604
605 addr = find_ibft_region(&size);
606
607 if (size)
608 memblock_reserve(addr, size);
609 }
610
611 static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
612
613 static bool __init snb_gfx_workaround_needed(void)
614 {
615 #ifdef CONFIG_PCI
616 int i;
617 u16 vendor, devid;
618 static const __initconst u16 snb_ids[] = {
619 0x0102,
620 0x0112,
621 0x0122,
622 0x0106,
623 0x0116,
624 0x0126,
625 0x010a,
626 };
627
628 /* Assume no if something weird is going on with PCI */
629 if (!early_pci_allowed())
630 return false;
631
632 vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
633 if (vendor != 0x8086)
634 return false;
635
636 devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
637 for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
638 if (devid == snb_ids[i])
639 return true;
640 #endif
641
642 return false;
643 }
644
645 /*
646 * Sandy Bridge graphics has trouble with certain ranges, exclude
647 * them from allocation.
648 */
649 static void __init trim_snb_memory(void)
650 {
651 static const __initconst unsigned long bad_pages[] = {
652 0x20050000,
653 0x20110000,
654 0x20130000,
655 0x20138000,
656 0x40004000,
657 };
658 int i;
659
660 if (!snb_gfx_workaround_needed())
661 return;
662
663 printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
664
665 /*
666 * Reserve all memory below the 1 MB mark that has not
667 * already been reserved.
668 */
669 memblock_reserve(0, 1<<20);
670
671 for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
672 if (memblock_reserve(bad_pages[i], PAGE_SIZE))
673 printk(KERN_WARNING "failed to reserve 0x%08lx\n",
674 bad_pages[i]);
675 }
676 }
677
678 /*
679 * Here we put platform-specific memory range workarounds, i.e.
680 * memory known to be corrupt or otherwise in need to be reserved on
681 * specific platforms.
682 *
683 * If this gets used more widely it could use a real dispatch mechanism.
684 */
685 static void __init trim_platform_memory_ranges(void)
686 {
687 trim_snb_memory();
688 }
689
690 static void __init trim_bios_range(void)
691 {
692 /*
693 * A special case is the first 4Kb of memory;
694 * This is a BIOS owned area, not kernel ram, but generally
695 * not listed as such in the E820 table.
696 *
697 * This typically reserves additional memory (64KiB by default)
698 * since some BIOSes are known to corrupt low memory. See the
699 * Kconfig help text for X86_RESERVE_LOW.
700 */
701 e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
702 E820_RAM, E820_RESERVED);
703
704 /*
705 * special case: Some BIOSen report the PC BIOS
706 * area (640->1Mb) as ram even though it is not.
707 * take them out.
708 */
709 e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
710
711 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
712 }
713
714 static int __init parse_reservelow(char *p)
715 {
716 unsigned long long size;
717
718 if (!p)
719 return -EINVAL;
720
721 size = memparse(p, &p);
722
723 if (size < 4096)
724 size = 4096;
725
726 if (size > 640*1024)
727 size = 640*1024;
728
729 reserve_low = size;
730
731 return 0;
732 }
733
734 early_param("reservelow", parse_reservelow);
735
736 /*
737 * Determine if we were loaded by an EFI loader. If so, then we have also been
738 * passed the efi memmap, systab, etc., so we should use these data structures
739 * for initialization. Note, the efi init code path is determined by the
740 * global efi_enabled. This allows the same kernel image to be used on existing
741 * systems (with a traditional BIOS) as well as on EFI systems.
742 */
743 /*
744 * setup_arch - architecture-specific boot-time initializations
745 *
746 * Note: On x86_64, fixmaps are ready for use even before this is called.
747 */
748
749 void __init setup_arch(char **cmdline_p)
750 {
751 #ifdef CONFIG_X86_32
752 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
753 visws_early_detect();
754
755 /*
756 * copy kernel address range established so far and switch
757 * to the proper swapper page table
758 */
759 clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
760 initial_page_table + KERNEL_PGD_BOUNDARY,
761 KERNEL_PGD_PTRS);
762
763 load_cr3(swapper_pg_dir);
764 __flush_tlb_all();
765 #else
766 printk(KERN_INFO "Command line: %s\n", boot_command_line);
767 #endif
768
769 /*
770 * If we have OLPC OFW, we might end up relocating the fixmap due to
771 * reserve_top(), so do this before touching the ioremap area.
772 */
773 olpc_ofw_detect();
774
775 early_trap_init();
776 early_cpu_init();
777 early_ioremap_init();
778
779 setup_olpc_ofw_pgd();
780
781 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
782 screen_info = boot_params.screen_info;
783 edid_info = boot_params.edid_info;
784 #ifdef CONFIG_X86_32
785 apm_info.bios = boot_params.apm_bios_info;
786 ist_info = boot_params.ist_info;
787 if (boot_params.sys_desc_table.length != 0) {
788 machine_id = boot_params.sys_desc_table.table[0];
789 machine_submodel_id = boot_params.sys_desc_table.table[1];
790 BIOS_revision = boot_params.sys_desc_table.table[2];
791 }
792 #endif
793 saved_video_mode = boot_params.hdr.vid_mode;
794 bootloader_type = boot_params.hdr.type_of_loader;
795 if ((bootloader_type >> 4) == 0xe) {
796 bootloader_type &= 0xf;
797 bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
798 }
799 bootloader_version = bootloader_type & 0xf;
800 bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
801
802 #ifdef CONFIG_BLK_DEV_RAM
803 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
804 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
805 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
806 #endif
807 #ifdef CONFIG_EFI
808 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
809 "EL32", 4)) {
810 efi_enabled = 1;
811 efi_64bit = false;
812 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
813 "EL64", 4)) {
814 efi_enabled = 1;
815 efi_64bit = true;
816 }
817 if (efi_enabled && efi_memblock_x86_reserve_range())
818 efi_enabled = 0;
819 #endif
820
821 x86_init.oem.arch_setup();
822
823 iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
824 setup_memory_map();
825 parse_setup_data();
826 /* update the e820_saved too */
827 e820_reserve_setup_data();
828
829 copy_edd();
830
831 if (!boot_params.hdr.root_flags)
832 root_mountflags &= ~MS_RDONLY;
833 init_mm.start_code = (unsigned long) _text;
834 init_mm.end_code = (unsigned long) _etext;
835 init_mm.end_data = (unsigned long) _edata;
836 init_mm.brk = _brk_end;
837
838 code_resource.start = virt_to_phys(_text);
839 code_resource.end = virt_to_phys(_etext)-1;
840 data_resource.start = virt_to_phys(_etext);
841 data_resource.end = virt_to_phys(_edata)-1;
842 bss_resource.start = virt_to_phys(&__bss_start);
843 bss_resource.end = virt_to_phys(&__bss_stop)-1;
844
845 #ifdef CONFIG_CMDLINE_BOOL
846 #ifdef CONFIG_CMDLINE_OVERRIDE
847 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
848 #else
849 if (builtin_cmdline[0]) {
850 /* append boot loader cmdline to builtin */
851 strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
852 strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
853 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
854 }
855 #endif
856 #endif
857
858 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
859 *cmdline_p = command_line;
860
861 /*
862 * x86_configure_nx() is called before parse_early_param() to detect
863 * whether hardware doesn't support NX (so that the early EHCI debug
864 * console setup can safely call set_fixmap()). It may then be called
865 * again from within noexec_setup() during parsing early parameters
866 * to honor the respective command line option.
867 */
868 x86_configure_nx();
869
870 parse_early_param();
871
872 x86_report_nx();
873
874 /* after early param, so could get panic from serial */
875 memblock_x86_reserve_range_setup_data();
876
877 if (acpi_mps_check()) {
878 #ifdef CONFIG_X86_LOCAL_APIC
879 disable_apic = 1;
880 #endif
881 setup_clear_cpu_cap(X86_FEATURE_APIC);
882 }
883
884 #ifdef CONFIG_PCI
885 if (pci_early_dump_regs)
886 early_dump_pci_devices();
887 #endif
888
889 finish_e820_parsing();
890
891 if (efi_enabled)
892 efi_init();
893
894 dmi_scan_machine();
895
896 /*
897 * VMware detection requires dmi to be available, so this
898 * needs to be done after dmi_scan_machine, for the BP.
899 */
900 init_hypervisor_platform();
901
902 x86_init.resources.probe_roms();
903
904 /* after parse_early_param, so could debug it */
905 insert_resource(&iomem_resource, &code_resource);
906 insert_resource(&iomem_resource, &data_resource);
907 insert_resource(&iomem_resource, &bss_resource);
908
909 trim_bios_range();
910 #ifdef CONFIG_X86_32
911 if (ppro_with_ram_bug()) {
912 e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
913 E820_RESERVED);
914 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
915 printk(KERN_INFO "fixed physical RAM map:\n");
916 e820_print_map("bad_ppro");
917 }
918 #else
919 early_gart_iommu_check();
920 #endif
921
922 /*
923 * partially used pages are not usable - thus
924 * we are rounding upwards:
925 */
926 max_pfn = e820_end_of_ram_pfn();
927
928 /* update e820 for memory not covered by WB MTRRs */
929 mtrr_bp_init();
930 if (mtrr_trim_uncached_memory(max_pfn))
931 max_pfn = e820_end_of_ram_pfn();
932
933 #ifdef CONFIG_X86_32
934 /* max_low_pfn get updated here */
935 find_low_pfn_range();
936 #else
937 num_physpages = max_pfn;
938
939 check_x2apic();
940
941 /* How many end-of-memory variables you have, grandma! */
942 /* need this before calling reserve_initrd */
943 if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
944 max_low_pfn = e820_end_of_low_ram_pfn();
945 else
946 max_low_pfn = max_pfn;
947
948 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
949 #endif
950
951 /*
952 * Find and reserve possible boot-time SMP configuration:
953 */
954 find_smp_config();
955
956 reserve_ibft_region();
957
958 /*
959 * Need to conclude brk, before memblock_x86_fill()
960 * it could use memblock_find_in_range, could overlap with
961 * brk area.
962 */
963 reserve_brk();
964
965 cleanup_highmap();
966
967 memblock.current_limit = get_max_mapped();
968 memblock_x86_fill();
969
970 /*
971 * The EFI specification says that boot service code won't be called
972 * after ExitBootServices(). This is, in fact, a lie.
973 */
974 if (efi_enabled)
975 efi_reserve_boot_services();
976
977 /* preallocate 4k for mptable mpc */
978 early_reserve_e820_mpc_new();
979
980 #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
981 setup_bios_corruption_check();
982 #endif
983
984 printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
985 (max_pfn_mapped<<PAGE_SHIFT) - 1);
986
987 setup_real_mode();
988
989 trim_platform_memory_ranges();
990
991 init_gbpages();
992
993 /* max_pfn_mapped is updated here */
994 max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
995 max_pfn_mapped = max_low_pfn_mapped;
996
997 #ifdef CONFIG_X86_64
998 if (max_pfn > max_low_pfn) {
999 int i;
1000 unsigned long start, end;
1001 unsigned long start_pfn, end_pfn;
1002
1003 for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn,
1004 NULL) {
1005
1006 end = PFN_PHYS(end_pfn);
1007 if (end <= (1UL<<32))
1008 continue;
1009
1010 start = PFN_PHYS(start_pfn);
1011 max_pfn_mapped = init_memory_mapping(
1012 max((1UL<<32), start), end);
1013 }
1014
1015 /* can we preseve max_low_pfn ?*/
1016 max_low_pfn = max_pfn;
1017 }
1018 #endif
1019 memblock.current_limit = get_max_mapped();
1020 dma_contiguous_reserve(0);
1021
1022 /*
1023 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
1024 */
1025
1026 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
1027 if (init_ohci1394_dma_early)
1028 init_ohci1394_dma_on_all_controllers();
1029 #endif
1030 /* Allocate bigger log buffer */
1031 setup_log_buf(1);
1032
1033 reserve_initrd();
1034
1035 #if defined(CONFIG_ACPI) && defined(CONFIG_BLK_DEV_INITRD)
1036 acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
1037 #endif
1038
1039 reserve_crashkernel();
1040
1041 vsmp_init();
1042
1043 io_delay_init();
1044
1045 /*
1046 * Parse the ACPI tables for possible boot-time SMP configuration.
1047 */
1048 acpi_boot_table_init();
1049
1050 early_acpi_boot_init();
1051
1052 initmem_init();
1053 memblock_find_dma_reserve();
1054
1055 #ifdef CONFIG_KVM_GUEST
1056 kvmclock_init();
1057 #endif
1058
1059 x86_init.paging.pagetable_init();
1060
1061 if (boot_cpu_data.cpuid_level >= 0) {
1062 /* A CPU has %cr4 if and only if it has CPUID */
1063 mmu_cr4_features = read_cr4();
1064 if (trampoline_cr4_features)
1065 *trampoline_cr4_features = mmu_cr4_features;
1066 }
1067
1068 #ifdef CONFIG_X86_32
1069 /* sync back kernel address range */
1070 clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
1071 swapper_pg_dir + KERNEL_PGD_BOUNDARY,
1072 KERNEL_PGD_PTRS);
1073 #endif
1074
1075 tboot_probe();
1076
1077 #ifdef CONFIG_X86_64
1078 map_vsyscall();
1079 #endif
1080
1081 generic_apic_probe();
1082
1083 early_quirks();
1084
1085 /*
1086 * Read APIC and some other early information from ACPI tables.
1087 */
1088 acpi_boot_init();
1089 sfi_init();
1090 x86_dtb_init();
1091
1092 /*
1093 * get boot-time SMP configuration:
1094 */
1095 if (smp_found_config)
1096 get_smp_config();
1097
1098 prefill_possible_map();
1099
1100 init_cpu_to_node();
1101
1102 init_apic_mappings();
1103 if (x86_io_apic_ops.init)
1104 x86_io_apic_ops.init();
1105
1106 kvm_guest_init();
1107
1108 e820_reserve_resources();
1109 e820_mark_nosave_regions(max_low_pfn);
1110
1111 x86_init.resources.reserve_resources();
1112
1113 e820_setup_gap();
1114
1115 #ifdef CONFIG_VT
1116 #if defined(CONFIG_VGA_CONSOLE)
1117 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
1118 conswitchp = &vga_con;
1119 #elif defined(CONFIG_DUMMY_CONSOLE)
1120 conswitchp = &dummy_con;
1121 #endif
1122 #endif
1123 x86_init.oem.banner();
1124
1125 x86_init.timers.wallclock_init();
1126
1127 mcheck_init();
1128
1129 arch_init_ideal_nops();
1130
1131 register_refined_jiffies(CLOCK_TICK_RATE);
1132
1133 #ifdef CONFIG_EFI
1134 /* Once setup is done above, disable efi_enabled on mismatched
1135 * firmware/kernel archtectures since there is no support for
1136 * runtime services.
1137 */
1138 if (efi_enabled && IS_ENABLED(CONFIG_X86_64) != efi_64bit) {
1139 pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
1140 efi_unmap_memmap();
1141 efi_enabled = 0;
1142 }
1143 #endif
1144 }
1145
1146 #ifdef CONFIG_X86_32
1147
1148 static struct resource video_ram_resource = {
1149 .name = "Video RAM area",
1150 .start = 0xa0000,
1151 .end = 0xbffff,
1152 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
1153 };
1154
1155 void __init i386_reserve_resources(void)
1156 {
1157 request_resource(&iomem_resource, &video_ram_resource);
1158 reserve_standard_io_resources();
1159 }
1160
1161 #endif /* CONFIG_X86_32 */
kernel source for telekom puls (alcatel/mediatek)