projects / linux-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
x86: coding style fixes to arch/x86/kernel/acpi/sleep.c
[linux-block.git] / arch / x86 / kernel / setup_32.c
... / ...
CommitLineData
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/apm_bios.h>
31#include <linux/initrd.h>
32#include <linux/bootmem.h>
33#include <linux/seq_file.h>
34#include <linux/console.h>
35#include <linux/mca.h>
36#include <linux/root_dev.h>
37#include <linux/highmem.h>
38#include <linux/module.h>
39#include <linux/efi.h>
40#include <linux/init.h>
41#include <linux/edd.h>
42#include <linux/nodemask.h>
43#include <linux/kexec.h>
44#include <linux/crash_dump.h>
45#include <linux/dmi.h>
46#include <linux/pfn.h>
47#include <linux/pci.h>
48#include <linux/init_ohci1394_dma.h>
49
50#include <video/edid.h>
51
52#include <asm/mtrr.h>
53#include <asm/apic.h>
54#include <asm/e820.h>
55#include <asm/mpspec.h>
56#include <asm/mmzone.h>
57#include <asm/setup.h>
58#include <asm/arch_hooks.h>
59#include <asm/sections.h>
60#include <asm/io_apic.h>
61#include <asm/ist.h>
62#include <asm/io.h>
63#include <asm/vmi.h>
64#include <setup_arch.h>
65#include <asm/bios_ebda.h>
66#include <asm/cacheflush.h>
67#include <asm/processor.h>
68
69/* This value is set up by the early boot code to point to the value
70 immediately after the boot time page tables. It contains a *physical*
71 address, and must not be in the .bss segment! */
72unsigned long init_pg_tables_end __initdata = ~0UL;
73
74/*
75 * Machine setup..
76 */
77static struct resource data_resource = {
78 .name = "Kernel data",
79 .start = 0,
80 .end = 0,
81 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
82};
83
84static struct resource code_resource = {
85 .name = "Kernel code",
86 .start = 0,
87 .end = 0,
88 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
89};
90
91static struct resource bss_resource = {
92 .name = "Kernel bss",
93 .start = 0,
94 .end = 0,
95 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
96};
97
98static struct resource video_ram_resource = {
99 .name = "Video RAM area",
100 .start = 0xa0000,
101 .end = 0xbffff,
102 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
103};
104
105static struct resource standard_io_resources[] = { {
106 .name = "dma1",
107 .start = 0x0000,
108 .end = 0x001f,
109 .flags = IORESOURCE_BUSY | IORESOURCE_IO
110}, {
111 .name = "pic1",
112 .start = 0x0020,
113 .end = 0x0021,
114 .flags = IORESOURCE_BUSY | IORESOURCE_IO
115}, {
116 .name = "timer0",
117 .start = 0x0040,
118 .end = 0x0043,
119 .flags = IORESOURCE_BUSY | IORESOURCE_IO
120}, {
121 .name = "timer1",
122 .start = 0x0050,
123 .end = 0x0053,
124 .flags = IORESOURCE_BUSY | IORESOURCE_IO
125}, {
126 .name = "keyboard",
127 .start = 0x0060,
128 .end = 0x006f,
129 .flags = IORESOURCE_BUSY | IORESOURCE_IO
130}, {
131 .name = "dma page reg",
132 .start = 0x0080,
133 .end = 0x008f,
134 .flags = IORESOURCE_BUSY | IORESOURCE_IO
135}, {
136 .name = "pic2",
137 .start = 0x00a0,
138 .end = 0x00a1,
139 .flags = IORESOURCE_BUSY | IORESOURCE_IO
140}, {
141 .name = "dma2",
142 .start = 0x00c0,
143 .end = 0x00df,
144 .flags = IORESOURCE_BUSY | IORESOURCE_IO
145}, {
146 .name = "fpu",
147 .start = 0x00f0,
148 .end = 0x00ff,
149 .flags = IORESOURCE_BUSY | IORESOURCE_IO
150} };
151
152/* cpu data as detected by the assembly code in head.S */
153struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
154/* common cpu data for all cpus */
155struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
156EXPORT_SYMBOL(boot_cpu_data);
157
158unsigned int def_to_bigsmp;
159
160#ifndef CONFIG_X86_PAE
161unsigned long mmu_cr4_features;
162#else
163unsigned long mmu_cr4_features = X86_CR4_PAE;
164#endif
165
166/* for MCA, but anyone else can use it if they want */
167unsigned int machine_id;
168unsigned int machine_submodel_id;
169unsigned int BIOS_revision;
170
171/* Boot loader ID as an integer, for the benefit of proc_dointvec */
172int bootloader_type;
173
174/* user-defined highmem size */
175static unsigned int highmem_pages = -1;
176
177/*
178 * Setup options
179 */
180struct screen_info screen_info;
181EXPORT_SYMBOL(screen_info);
182struct apm_info apm_info;
183EXPORT_SYMBOL(apm_info);
184struct edid_info edid_info;
185EXPORT_SYMBOL_GPL(edid_info);
186struct ist_info ist_info;
187#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
188 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
189EXPORT_SYMBOL(ist_info);
190#endif
191
192extern void early_cpu_init(void);
193extern int root_mountflags;
194
195unsigned long saved_videomode;
196
197#define RAMDISK_IMAGE_START_MASK 0x07FF
198#define RAMDISK_PROMPT_FLAG 0x8000
199#define RAMDISK_LOAD_FLAG 0x4000
200
201static char __initdata command_line[COMMAND_LINE_SIZE];
202
203#ifndef CONFIG_DEBUG_BOOT_PARAMS
204struct boot_params __initdata boot_params;
205#else
206struct boot_params boot_params;
207#endif
208
209#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
210struct edd edd;
211#ifdef CONFIG_EDD_MODULE
212EXPORT_SYMBOL(edd);
213#endif
214/**
215 * copy_edd() - Copy the BIOS EDD information
216 * from boot_params into a safe place.
217 *
218 */
219static inline void copy_edd(void)
220{
221 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
222 sizeof(edd.mbr_signature));
223 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
224 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
225 edd.edd_info_nr = boot_params.eddbuf_entries;
226}
227#else
228static inline void copy_edd(void)
229{
230}
231#endif
232
233int __initdata user_defined_memmap;
234
235/*
236 * "mem=nopentium" disables the 4MB page tables.
237 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
238 * to <mem>, overriding the bios size.
239 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
240 * <start> to <start>+<mem>, overriding the bios size.
241 *
242 * HPA tells me bootloaders need to parse mem=, so no new
243 * option should be mem= [also see Documentation/i386/boot.txt]
244 */
245static int __init parse_mem(char *arg)
246{
247 if (!arg)
248 return -EINVAL;
249
250 if (strcmp(arg, "nopentium") == 0) {
251 setup_clear_cpu_cap(X86_FEATURE_PSE);
252 } else {
253 /* If the user specifies memory size, we
254 * limit the BIOS-provided memory map to
255 * that size. exactmap can be used to specify
256 * the exact map. mem=number can be used to
257 * trim the existing memory map.
258 */
259 unsigned long long mem_size;
260
261 mem_size = memparse(arg, &arg);
262 limit_regions(mem_size);
263 user_defined_memmap = 1;
264 }
265 return 0;
266}
267early_param("mem", parse_mem);
268
269#ifdef CONFIG_PROC_VMCORE
270/* elfcorehdr= specifies the location of elf core header
271 * stored by the crashed kernel.
272 */
273static int __init parse_elfcorehdr(char *arg)
274{
275 if (!arg)
276 return -EINVAL;
277
278 elfcorehdr_addr = memparse(arg, &arg);
279 return 0;
280}
281early_param("elfcorehdr", parse_elfcorehdr);
282#endif /* CONFIG_PROC_VMCORE */
283
284/*
285 * highmem=size forces highmem to be exactly 'size' bytes.
286 * This works even on boxes that have no highmem otherwise.
287 * This also works to reduce highmem size on bigger boxes.
288 */
289static int __init parse_highmem(char *arg)
290{
291 if (!arg)
292 return -EINVAL;
293
294 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
295 return 0;
296}
297early_param("highmem", parse_highmem);
298
299/*
300 * vmalloc=size forces the vmalloc area to be exactly 'size'
301 * bytes. This can be used to increase (or decrease) the
302 * vmalloc area - the default is 128m.
303 */
304static int __init parse_vmalloc(char *arg)
305{
306 if (!arg)
307 return -EINVAL;
308
309 __VMALLOC_RESERVE = memparse(arg, &arg);
310 return 0;
311}
312early_param("vmalloc", parse_vmalloc);
313
314/*
315 * reservetop=size reserves a hole at the top of the kernel address space which
316 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
317 * so relocating the fixmap can be done before paging initialization.
318 */
319static int __init parse_reservetop(char *arg)
320{
321 unsigned long address;
322
323 if (!arg)
324 return -EINVAL;
325
326 address = memparse(arg, &arg);
327 reserve_top_address(address);
328 return 0;
329}
330early_param("reservetop", parse_reservetop);
331
332/*
333 * Determine low and high memory ranges:
334 */
335unsigned long __init find_max_low_pfn(void)
336{
337 unsigned long max_low_pfn;
338
339 max_low_pfn = max_pfn;
340 if (max_low_pfn > MAXMEM_PFN) {
341 if (highmem_pages == -1)
342 highmem_pages = max_pfn - MAXMEM_PFN;
343 if (highmem_pages + MAXMEM_PFN < max_pfn)
344 max_pfn = MAXMEM_PFN + highmem_pages;
345 if (highmem_pages + MAXMEM_PFN > max_pfn) {
346 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
347 highmem_pages = 0;
348 }
349 max_low_pfn = MAXMEM_PFN;
350#ifndef CONFIG_HIGHMEM
351 /* Maximum memory usable is what is directly addressable */
352 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
353 MAXMEM>>20);
354 if (max_pfn > MAX_NONPAE_PFN)
355 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
356 else
357 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
358 max_pfn = MAXMEM_PFN;
359#else /* !CONFIG_HIGHMEM */
360#ifndef CONFIG_HIGHMEM64G
361 if (max_pfn > MAX_NONPAE_PFN) {
362 max_pfn = MAX_NONPAE_PFN;
363 printk(KERN_WARNING "Warning only 4GB will be used.\n");
364 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
365 }
366#endif /* !CONFIG_HIGHMEM64G */
367#endif /* !CONFIG_HIGHMEM */
368 } else {
369 if (highmem_pages == -1)
370 highmem_pages = 0;
371#ifdef CONFIG_HIGHMEM
372 if (highmem_pages >= max_pfn) {
373 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
374 highmem_pages = 0;
375 }
376 if (highmem_pages) {
377 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
378 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
379 highmem_pages = 0;
380 }
381 max_low_pfn -= highmem_pages;
382 }
383#else
384 if (highmem_pages)
385 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
386#endif
387 }
388 return max_low_pfn;
389}
390
391#define BIOS_EBDA_SEGMENT 0x40E
392#define BIOS_LOWMEM_KILOBYTES 0x413
393
394/*
395 * The BIOS places the EBDA/XBDA at the top of conventional
396 * memory, and usually decreases the reported amount of
397 * conventional memory (int 0x12) too. This also contains a
398 * workaround for Dell systems that neglect to reserve EBDA.
399 * The same workaround also avoids a problem with the AMD768MPX
400 * chipset: reserve a page before VGA to prevent PCI prefetch
401 * into it (errata #56). Usually the page is reserved anyways,
402 * unless you have no PS/2 mouse plugged in.
403 */
404static void __init reserve_ebda_region(void)
405{
406 unsigned int lowmem, ebda_addr;
407
408 /* To determine the position of the EBDA and the */
409 /* end of conventional memory, we need to look at */
410 /* the BIOS data area. In a paravirtual environment */
411 /* that area is absent. We'll just have to assume */
412 /* that the paravirt case can handle memory setup */
413 /* correctly, without our help. */
414 if (paravirt_enabled())
415 return;
416
417 /* end of low (conventional) memory */
418 lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
419 lowmem <<= 10;
420
421 /* start of EBDA area */
422 ebda_addr = *(unsigned short *)__va(BIOS_EBDA_SEGMENT);
423 ebda_addr <<= 4;
424
425 /* Fixup: bios puts an EBDA in the top 64K segment */
426 /* of conventional memory, but does not adjust lowmem. */
427 if ((lowmem - ebda_addr) <= 0x10000)
428 lowmem = ebda_addr;
429
430 /* Fixup: bios does not report an EBDA at all. */
431 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
432 if ((ebda_addr == 0) && (lowmem >= 0x9f000))
433 lowmem = 0x9f000;
434
435 /* Paranoia: should never happen, but... */
436 if ((lowmem == 0) || (lowmem >= 0x100000))
437 lowmem = 0x9f000;
438
439 /* reserve all memory between lowmem and the 1MB mark */
440 reserve_bootmem(lowmem, 0x100000 - lowmem, BOOTMEM_DEFAULT);
441}
442
443#ifndef CONFIG_NEED_MULTIPLE_NODES
444void __init setup_bootmem_allocator(void);
445static unsigned long __init setup_memory(void)
446{
447 /*
448 * partially used pages are not usable - thus
449 * we are rounding upwards:
450 */
451 min_low_pfn = PFN_UP(init_pg_tables_end);
452
453 max_low_pfn = find_max_low_pfn();
454
455#ifdef CONFIG_HIGHMEM
456 highstart_pfn = highend_pfn = max_pfn;
457 if (max_pfn > max_low_pfn) {
458 highstart_pfn = max_low_pfn;
459 }
460 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
461 pages_to_mb(highend_pfn - highstart_pfn));
462 num_physpages = highend_pfn;
463 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
464#else
465 num_physpages = max_low_pfn;
466 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
467#endif
468#ifdef CONFIG_FLATMEM
469 max_mapnr = num_physpages;
470#endif
471 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
472 pages_to_mb(max_low_pfn));
473
474 setup_bootmem_allocator();
475
476 return max_low_pfn;
477}
478
479void __init zone_sizes_init(void)
480{
481 unsigned long max_zone_pfns[MAX_NR_ZONES];
482 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
483 max_zone_pfns[ZONE_DMA] =
484 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
485 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
486#ifdef CONFIG_HIGHMEM
487 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
488 add_active_range(0, 0, highend_pfn);
489#else
490 add_active_range(0, 0, max_low_pfn);
491#endif
492
493 free_area_init_nodes(max_zone_pfns);
494}
495#else
496extern unsigned long __init setup_memory(void);
497extern void zone_sizes_init(void);
498#endif /* !CONFIG_NEED_MULTIPLE_NODES */
499
500static inline unsigned long long get_total_mem(void)
501{
502 unsigned long long total;
503
504 total = max_low_pfn - min_low_pfn;
505#ifdef CONFIG_HIGHMEM
506 total += highend_pfn - highstart_pfn;
507#endif
508
509 return total << PAGE_SHIFT;
510}
511
512#ifdef CONFIG_KEXEC
513static 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 = get_total_mem();
520
521 ret = parse_crashkernel(boot_command_line, total_mem,
522 &crash_size, &crash_base);
523 if (ret == 0 && crash_size > 0) {
524 if (crash_base > 0) {
525 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
526 "for crashkernel (System RAM: %ldMB)\n",
527 (unsigned long)(crash_size >> 20),
528 (unsigned long)(crash_base >> 20),
529 (unsigned long)(total_mem >> 20));
530 crashk_res.start = crash_base;
531 crashk_res.end = crash_base + crash_size - 1;
532 reserve_bootmem(crash_base, crash_size,
533 BOOTMEM_DEFAULT);
534 } else
535 printk(KERN_INFO "crashkernel reservation failed - "
536 "you have to specify a base address\n");
537 }
538}
539#else
540static inline void __init reserve_crashkernel(void)
541{}
542#endif
543
544#ifdef CONFIG_BLK_DEV_INITRD
545
546static bool do_relocate_initrd = false;
547
548static void __init reserve_initrd(void)
549{
550 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
551 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
552 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
553 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
554 unsigned long ramdisk_here;
555
556 initrd_start = 0;
557
558 if (!boot_params.hdr.type_of_loader ||
559 !ramdisk_image || !ramdisk_size)
560 return; /* No initrd provided by bootloader */
561
562 if (ramdisk_end < ramdisk_image) {
563 printk(KERN_ERR "initrd wraps around end of memory, "
564 "disabling initrd\n");
565 return;
566 }
567 if (ramdisk_size >= end_of_lowmem/2) {
568 printk(KERN_ERR "initrd too large to handle, "
569 "disabling initrd\n");
570 return;
571 }
572 if (ramdisk_end <= end_of_lowmem) {
573 /* All in lowmem, easy case */
574 reserve_bootmem(ramdisk_image, ramdisk_size, BOOTMEM_DEFAULT);
575 initrd_start = ramdisk_image + PAGE_OFFSET;
576 initrd_end = initrd_start+ramdisk_size;
577 return;
578 }
579
580 /* We need to move the initrd down into lowmem */
581 ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
582
583 /* Note: this includes all the lowmem currently occupied by
584 the initrd, we rely on that fact to keep the data intact. */
585 reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
586 initrd_start = ramdisk_here + PAGE_OFFSET;
587 initrd_end = initrd_start + ramdisk_size;
588
589 do_relocate_initrd = true;
590}
591
592#define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
593
594static void __init relocate_initrd(void)
595{
596 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
597 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
598 unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
599 unsigned long ramdisk_here;
600 unsigned long slop, clen, mapaddr;
601 char *p, *q;
602
603 if (!do_relocate_initrd)
604 return;
605
606 ramdisk_here = initrd_start - PAGE_OFFSET;
607
608 q = (char *)initrd_start;
609
610 /* Copy any lowmem portion of the initrd */
611 if (ramdisk_image < end_of_lowmem) {
612 clen = end_of_lowmem - ramdisk_image;
613 p = (char *)__va(ramdisk_image);
614 memcpy(q, p, clen);
615 q += clen;
616 ramdisk_image += clen;
617 ramdisk_size -= clen;
618 }
619
620 /* Copy the highmem portion of the initrd */
621 while (ramdisk_size) {
622 slop = ramdisk_image & ~PAGE_MASK;
623 clen = ramdisk_size;
624 if (clen > MAX_MAP_CHUNK-slop)
625 clen = MAX_MAP_CHUNK-slop;
626 mapaddr = ramdisk_image & PAGE_MASK;
627 p = early_ioremap(mapaddr, clen+slop);
628 memcpy(q, p+slop, clen);
629 early_iounmap(p, clen+slop);
630 q += clen;
631 ramdisk_image += clen;
632 ramdisk_size -= clen;
633 }
634}
635
636#endif /* CONFIG_BLK_DEV_INITRD */
637
638void __init setup_bootmem_allocator(void)
639{
640 unsigned long bootmap_size;
641 /*
642 * Initialize the boot-time allocator (with low memory only):
643 */
644 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
645
646 register_bootmem_low_pages(max_low_pfn);
647
648 /*
649 * Reserve the bootmem bitmap itself as well. We do this in two
650 * steps (first step was init_bootmem()) because this catches
651 * the (very unlikely) case of us accidentally initializing the
652 * bootmem allocator with an invalid RAM area.
653 */
654 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
655 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text),
656 BOOTMEM_DEFAULT);
657
658 /*
659 * reserve physical page 0 - it's a special BIOS page on many boxes,
660 * enabling clean reboots, SMP operation, laptop functions.
661 */
662 reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
663
664 /* reserve EBDA region */
665 reserve_ebda_region();
666
667#ifdef CONFIG_SMP
668 /*
669 * But first pinch a few for the stack/trampoline stuff
670 * FIXME: Don't need the extra page at 4K, but need to fix
671 * trampoline before removing it. (see the GDT stuff)
672 */
673 reserve_bootmem(PAGE_SIZE, PAGE_SIZE, BOOTMEM_DEFAULT);
674#endif
675#ifdef CONFIG_ACPI_SLEEP
676 /*
677 * Reserve low memory region for sleep support.
678 */
679 acpi_reserve_bootmem();
680#endif
681#ifdef CONFIG_X86_FIND_SMP_CONFIG
682 /*
683 * Find and reserve possible boot-time SMP configuration:
684 */
685 find_smp_config();
686#endif
687#ifdef CONFIG_BLK_DEV_INITRD
688 reserve_initrd();
689#endif
690 numa_kva_reserve();
691 reserve_crashkernel();
692}
693
694/*
695 * The node 0 pgdat is initialized before all of these because
696 * it's needed for bootmem. node>0 pgdats have their virtual
697 * space allocated before the pagetables are in place to access
698 * them, so they can't be cleared then.
699 *
700 * This should all compile down to nothing when NUMA is off.
701 */
702static void __init remapped_pgdat_init(void)
703{
704 int nid;
705
706 for_each_online_node(nid) {
707 if (nid != 0)
708 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
709 }
710}
711
712#ifdef CONFIG_MCA
713static void set_mca_bus(int x)
714{
715 MCA_bus = x;
716}
717#else
718static void set_mca_bus(int x) { }
719#endif
720
721/* Overridden in paravirt.c if CONFIG_PARAVIRT */
722char * __init __attribute__((weak)) memory_setup(void)
723{
724 return machine_specific_memory_setup();
725}
726
727#ifdef CONFIG_NUMA
728/*
729 * In the golden day, when everything among i386 and x86_64 will be
730 * integrated, this will not live here
731 */
732void *x86_cpu_to_node_map_early_ptr;
733int x86_cpu_to_node_map_init[NR_CPUS] = {
734 [0 ... NR_CPUS-1] = NUMA_NO_NODE
735};
736DEFINE_PER_CPU(int, x86_cpu_to_node_map) = NUMA_NO_NODE;
737#endif
738
739/*
740 * Determine if we were loaded by an EFI loader. If so, then we have also been
741 * passed the efi memmap, systab, etc., so we should use these data structures
742 * for initialization. Note, the efi init code path is determined by the
743 * global efi_enabled. This allows the same kernel image to be used on existing
744 * systems (with a traditional BIOS) as well as on EFI systems.
745 */
746void __init setup_arch(char **cmdline_p)
747{
748 unsigned long max_low_pfn;
749
750 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
751 pre_setup_arch_hook();
752 early_cpu_init();
753 early_ioremap_init();
754
755#ifdef CONFIG_EFI
756 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
757 "EL32", 4))
758 efi_enabled = 1;
759#endif
760
761 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
762 screen_info = boot_params.screen_info;
763 edid_info = boot_params.edid_info;
764 apm_info.bios = boot_params.apm_bios_info;
765 ist_info = boot_params.ist_info;
766 saved_videomode = boot_params.hdr.vid_mode;
767 if( boot_params.sys_desc_table.length != 0 ) {
768 set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
769 machine_id = boot_params.sys_desc_table.table[0];
770 machine_submodel_id = boot_params.sys_desc_table.table[1];
771 BIOS_revision = boot_params.sys_desc_table.table[2];
772 }
773 bootloader_type = boot_params.hdr.type_of_loader;
774
775#ifdef CONFIG_BLK_DEV_RAM
776 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
777 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
778 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
779#endif
780 ARCH_SETUP
781
782 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
783 print_memory_map(memory_setup());
784
785 copy_edd();
786
787 if (!boot_params.hdr.root_flags)
788 root_mountflags &= ~MS_RDONLY;
789 init_mm.start_code = (unsigned long) _text;
790 init_mm.end_code = (unsigned long) _etext;
791 init_mm.end_data = (unsigned long) _edata;
792 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
793
794 code_resource.start = virt_to_phys(_text);
795 code_resource.end = virt_to_phys(_etext)-1;
796 data_resource.start = virt_to_phys(_etext);
797 data_resource.end = virt_to_phys(_edata)-1;
798 bss_resource.start = virt_to_phys(&__bss_start);
799 bss_resource.end = virt_to_phys(&__bss_stop)-1;
800
801 parse_early_param();
802
803 if (user_defined_memmap) {
804 printk(KERN_INFO "user-defined physical RAM map:\n");
805 print_memory_map("user");
806 }
807
808 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
809 *cmdline_p = command_line;
810
811 if (efi_enabled)
812 efi_init();
813
814 /* update e820 for memory not covered by WB MTRRs */
815 find_max_pfn();
816 mtrr_bp_init();
817 if (mtrr_trim_uncached_memory(max_pfn))
818 find_max_pfn();
819
820 max_low_pfn = setup_memory();
821
822#ifdef CONFIG_VMI
823 /*
824 * Must be after max_low_pfn is determined, and before kernel
825 * pagetables are setup.
826 */
827 vmi_init();
828#endif
829
830 /*
831 * NOTE: before this point _nobody_ is allowed to allocate
832 * any memory using the bootmem allocator. Although the
833 * allocator is now initialised only the first 8Mb of the kernel
834 * virtual address space has been mapped. All allocations before
835 * paging_init() has completed must use the alloc_bootmem_low_pages()
836 * variant (which allocates DMA'able memory) and care must be taken
837 * not to exceed the 8Mb limit.
838 */
839
840#ifdef CONFIG_SMP
841 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
842#endif
843 paging_init();
844
845 /*
846 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
847 */
848
849#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
850 if (init_ohci1394_dma_early)
851 init_ohci1394_dma_on_all_controllers();
852#endif
853
854 remapped_pgdat_init();
855 sparse_init();
856 zone_sizes_init();
857
858 /*
859 * NOTE: at this point the bootmem allocator is fully available.
860 */
861
862#ifdef CONFIG_BLK_DEV_INITRD
863 relocate_initrd();
864#endif
865
866 paravirt_post_allocator_init();
867
868 dmi_scan_machine();
869
870 io_delay_init();
871
872#ifdef CONFIG_X86_SMP
873 /*
874 * setup to use the early static init tables during kernel startup
875 * X86_SMP will exclude sub-arches that don't deal well with it.
876 */
877 x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
878 x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
879#ifdef CONFIG_NUMA
880 x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
881#endif
882#endif
883
884#ifdef CONFIG_X86_GENERICARCH
885 generic_apic_probe();
886#endif
887
888#ifdef CONFIG_ACPI
889 /*
890 * Parse the ACPI tables for possible boot-time SMP configuration.
891 */
892 acpi_boot_table_init();
893#endif
894
895 early_quirks();
896
897#ifdef CONFIG_ACPI
898 acpi_boot_init();
899
900#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
901 if (def_to_bigsmp)
902 printk(KERN_WARNING "More than 8 CPUs detected and "
903 "CONFIG_X86_PC cannot handle it.\nUse "
904 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
905#endif
906#endif
907#ifdef CONFIG_X86_LOCAL_APIC
908 if (smp_found_config)
909 get_smp_config();
910#endif
911
912 e820_register_memory();
913 e820_mark_nosave_regions();
914
915#ifdef CONFIG_VT
916#if defined(CONFIG_VGA_CONSOLE)
917 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
918 conswitchp = &vga_con;
919#elif defined(CONFIG_DUMMY_CONSOLE)
920 conswitchp = &dummy_con;
921#endif
922#endif
923}
924
925/*
926 * Request address space for all standard resources
927 *
928 * This is called just before pcibios_init(), which is also a
929 * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
930 */
931static int __init request_standard_resources(void)
932{
933 int i;
934
935 printk(KERN_INFO "Setting up standard PCI resources\n");
936 init_iomem_resources(&code_resource, &data_resource, &bss_resource);
937
938 request_resource(&iomem_resource, &video_ram_resource);
939
940 /* request I/O space for devices used on all i[345]86 PCs */
941 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
942 request_resource(&ioport_resource, &standard_io_resources[i]);
943 return 0;
944}
945
946subsys_initcall(request_standard_resources);
Linux 6.x block layer and io_uring tree(s)