blob: d474cd639bcb8ece22f706d285950926a50541ac [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/i386/kernel/setup.c
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 *
6 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
7 *
8 * Memory region support
9 * David Parsons <orc@pell.chi.il.us>, July-August 1999
10 *
11 * Added E820 sanitization routine (removes overlapping memory regions);
12 * Brian Moyle <bmoyle@mvista.com>, February 2001
13 *
14 * Moved CPU detection code to cpu/${cpu}.c
15 * Patrick Mochel <mochel@osdl.org>, March 2002
16 *
17 * Provisions for empty E820 memory regions (reported by certain BIOSes).
18 * Alex Achenbach <xela@slit.de>, December 2002.
19 *
20 */
21
22/*
23 * This file handles the architecture-dependent parts of initialization
24 */
25
26#include <linux/sched.h>
27#include <linux/mm.h>
Andy Whitcroft05b79bd2005-06-23 00:07:57 -070028#include <linux/mmzone.h>
Jon Smirl894673e2006-07-10 04:44:13 -070029#include <linux/screen_info.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/ioport.h>
31#include <linux/acpi.h>
32#include <linux/apm_bios.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/seq_file.h>
36#include <linux/console.h>
37#include <linux/mca.h>
38#include <linux/root_dev.h>
39#include <linux/highmem.h>
40#include <linux/module.h>
41#include <linux/efi.h>
42#include <linux/init.h>
43#include <linux/edd.h>
44#include <linux/nodemask.h>
Eric W. Biederman1bc3b912005-06-25 14:58:01 -070045#include <linux/kexec.h>
Vivek Goyal2030eae2005-06-25 14:58:20 -070046#include <linux/crash_dump.h>
Andi Kleene9928672006-01-11 22:43:33 +010047#include <linux/dmi.h>
Dave Hansen22a98352006-03-27 01:16:04 -080048#include <linux/pfn.h>
Eric W. Biederman1bc3b912005-06-25 14:58:01 -070049
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <video/edid.h>
Eric W. Biederman1bc3b912005-06-25 14:58:01 -070051
Eric W. Biederman9635b472005-06-25 14:57:41 -070052#include <asm/apic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <asm/e820.h>
54#include <asm/mpspec.h>
keith mannthey91023302006-09-25 23:31:03 -070055#include <asm/mmzone.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <asm/setup.h>
57#include <asm/arch_hooks.h>
58#include <asm/sections.h>
59#include <asm/io_apic.h>
60#include <asm/ist.h>
61#include <asm/io.h>
Zachary Amsden7ce0bcf2007-02-13 13:26:21 +010062#include <asm/vmi.h>
Jeremy Fitzhardingee75eac32006-06-25 05:46:50 -070063#include <setup_arch.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <bios_ebda.h>
65
66/* This value is set up by the early boot code to point to the value
67 immediately after the boot time page tables. It contains a *physical*
68 address, and must not be in the .bss segment! */
69unsigned long init_pg_tables_end __initdata = ~0UL;
70
Li Shaohua0bb31842005-06-25 14:54:55 -070071int disable_pse __devinitdata = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73/*
74 * Machine setup..
75 */
bibo,mao269c2d82006-12-07 02:14:06 +010076extern struct resource code_resource;
77extern struct resource data_resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79/* cpu data as detected by the assembly code in head.S */
Vivek Goyal4a5d1072007-01-11 01:52:44 +010080struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/* common cpu data for all cpus */
Christoph Lameterc3d8c142005-09-06 15:16:33 -070082struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
Alexey Dobriyan129f6942005-06-23 00:08:33 -070083EXPORT_SYMBOL(boot_cpu_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85unsigned long mmu_cr4_features;
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087/* for MCA, but anyone else can use it if they want */
88unsigned int machine_id;
Alexey Dobriyan129f6942005-06-23 00:08:33 -070089#ifdef CONFIG_MCA
90EXPORT_SYMBOL(machine_id);
91#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070092unsigned int machine_submodel_id;
93unsigned int BIOS_revision;
94unsigned int mca_pentium_flag;
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* Boot loader ID as an integer, for the benefit of proc_dointvec */
97int bootloader_type;
98
99/* user-defined highmem size */
100static unsigned int highmem_pages = -1;
101
102/*
103 * Setup options
104 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105struct screen_info screen_info;
Alexey Dobriyan129f6942005-06-23 00:08:33 -0700106EXPORT_SYMBOL(screen_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107struct apm_info apm_info;
Alexey Dobriyan129f6942005-06-23 00:08:33 -0700108EXPORT_SYMBOL(apm_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109struct edid_info edid_info;
Antonino A. Daplas5e518d72005-09-09 13:04:34 -0700110EXPORT_SYMBOL_GPL(edid_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111struct ist_info ist_info;
Alexey Dobriyan129f6942005-06-23 00:08:33 -0700112#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
113 defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
114EXPORT_SYMBOL(ist_info);
115#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117extern void early_cpu_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118extern int root_mountflags;
119
120unsigned long saved_videomode;
121
122#define RAMDISK_IMAGE_START_MASK 0x07FF
123#define RAMDISK_PROMPT_FLAG 0x8000
124#define RAMDISK_LOAD_FLAG 0x4000
125
Alon Bar-Lev4e498b62007-02-12 00:54:11 -0800126static char __initdata command_line[COMMAND_LINE_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
H. Peter Anvin48c7ae62007-07-11 12:18:35 -0700128struct boot_params __initdata boot_params;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
131struct edd edd;
132#ifdef CONFIG_EDD_MODULE
133EXPORT_SYMBOL(edd);
134#endif
135/**
136 * copy_edd() - Copy the BIOS EDD information
137 * from boot_params into a safe place.
138 *
139 */
140static inline void copy_edd(void)
141{
142 memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
143 memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
144 edd.mbr_signature_nr = EDD_MBR_SIG_NR;
145 edd.edd_info_nr = EDD_NR;
146}
147#else
148static inline void copy_edd(void)
149{
150}
151#endif
152
bibo,maocef518e2006-12-07 02:14:06 +0100153int __initdata user_defined_memmap = 0;
Rusty Russell1a3f2392006-09-26 10:52:32 +0200154
155/*
156 * "mem=nopentium" disables the 4MB page tables.
157 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
158 * to <mem>, overriding the bios size.
159 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
160 * <start> to <start>+<mem>, overriding the bios size.
161 *
162 * HPA tells me bootloaders need to parse mem=, so no new
163 * option should be mem= [also see Documentation/i386/boot.txt]
164 */
165static int __init parse_mem(char *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Rusty Russell1a3f2392006-09-26 10:52:32 +0200167 if (!arg)
168 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Rusty Russell1a3f2392006-09-26 10:52:32 +0200170 if (strcmp(arg, "nopentium") == 0) {
171 clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
172 disable_pse = 1;
173 } else {
174 /* If the user specifies memory size, we
175 * limit the BIOS-provided memory map to
176 * that size. exactmap can be used to specify
177 * the exact map. mem=number can be used to
178 * trim the existing memory map.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 */
Rusty Russell1a3f2392006-09-26 10:52:32 +0200180 unsigned long long mem_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Rusty Russell1a3f2392006-09-26 10:52:32 +0200182 mem_size = memparse(arg, &arg);
183 limit_regions(mem_size);
184 user_defined_memmap = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
Rusty Russell1a3f2392006-09-26 10:52:32 +0200186 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
Rusty Russell1a3f2392006-09-26 10:52:32 +0200188early_param("mem", parse_mem);
189
Rusty Russell1a3f2392006-09-26 10:52:32 +0200190#ifdef CONFIG_PROC_VMCORE
191/* elfcorehdr= specifies the location of elf core header
192 * stored by the crashed kernel.
193 */
194static int __init parse_elfcorehdr(char *arg)
195{
196 if (!arg)
197 return -EINVAL;
198
199 elfcorehdr_addr = memparse(arg, &arg);
200 return 0;
201}
202early_param("elfcorehdr", parse_elfcorehdr);
203#endif /* CONFIG_PROC_VMCORE */
204
205/*
206 * highmem=size forces highmem to be exactly 'size' bytes.
207 * This works even on boxes that have no highmem otherwise.
208 * This also works to reduce highmem size on bigger boxes.
209 */
210static int __init parse_highmem(char *arg)
211{
212 if (!arg)
213 return -EINVAL;
214
215 highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
216 return 0;
217}
218early_param("highmem", parse_highmem);
219
220/*
221 * vmalloc=size forces the vmalloc area to be exactly 'size'
222 * bytes. This can be used to increase (or decrease) the
223 * vmalloc area - the default is 128m.
224 */
225static int __init parse_vmalloc(char *arg)
226{
227 if (!arg)
228 return -EINVAL;
229
230 __VMALLOC_RESERVE = memparse(arg, &arg);
231 return 0;
232}
233early_param("vmalloc", parse_vmalloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235/*
Zachary Amsden461a9af2006-09-25 23:32:25 -0700236 * reservetop=size reserves a hole at the top of the kernel address space which
237 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
238 * so relocating the fixmap can be done before paging initialization.
239 */
240static int __init parse_reservetop(char *arg)
241{
242 unsigned long address;
243
244 if (!arg)
245 return -EINVAL;
246
247 address = memparse(arg, &arg);
248 reserve_top_address(address);
249 return 0;
250}
251early_param("reservetop", parse_reservetop);
252
253/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 * Determine low and high memory ranges:
255 */
256unsigned long __init find_max_low_pfn(void)
257{
258 unsigned long max_low_pfn;
259
260 max_low_pfn = max_pfn;
261 if (max_low_pfn > MAXMEM_PFN) {
262 if (highmem_pages == -1)
263 highmem_pages = max_pfn - MAXMEM_PFN;
264 if (highmem_pages + MAXMEM_PFN < max_pfn)
265 max_pfn = MAXMEM_PFN + highmem_pages;
266 if (highmem_pages + MAXMEM_PFN > max_pfn) {
267 printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
268 highmem_pages = 0;
269 }
270 max_low_pfn = MAXMEM_PFN;
271#ifndef CONFIG_HIGHMEM
272 /* Maximum memory usable is what is directly addressable */
273 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
274 MAXMEM>>20);
275 if (max_pfn > MAX_NONPAE_PFN)
William Lee Irwin IIIc673f1a2007-07-21 17:11:13 +0200276 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 else
278 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
279 max_pfn = MAXMEM_PFN;
280#else /* !CONFIG_HIGHMEM */
William Lee Irwin IIIc673f1a2007-07-21 17:11:13 +0200281#ifndef CONFIG_HIGHMEM64G
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (max_pfn > MAX_NONPAE_PFN) {
283 max_pfn = MAX_NONPAE_PFN;
284 printk(KERN_WARNING "Warning only 4GB will be used.\n");
William Lee Irwin IIIc673f1a2007-07-21 17:11:13 +0200285 printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
William Lee Irwin IIIc673f1a2007-07-21 17:11:13 +0200287#endif /* !CONFIG_HIGHMEM64G */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288#endif /* !CONFIG_HIGHMEM */
289 } else {
290 if (highmem_pages == -1)
291 highmem_pages = 0;
292#ifdef CONFIG_HIGHMEM
293 if (highmem_pages >= max_pfn) {
294 printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
295 highmem_pages = 0;
296 }
297 if (highmem_pages) {
298 if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
299 printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
300 highmem_pages = 0;
301 }
302 max_low_pfn -= highmem_pages;
303 }
304#else
305 if (highmem_pages)
306 printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
307#endif
308 }
309 return max_low_pfn;
310}
311
312/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * workaround for Dell systems that neglect to reserve EBDA
314 */
315static void __init reserve_ebda_region(void)
316{
317 unsigned int addr;
318 addr = get_bios_ebda();
319 if (addr)
320 reserve_bootmem(addr, PAGE_SIZE);
321}
322
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700323#ifndef CONFIG_NEED_MULTIPLE_NODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324void __init setup_bootmem_allocator(void);
325static unsigned long __init setup_memory(void)
326{
327 /*
328 * partially used pages are not usable - thus
329 * we are rounding upwards:
330 */
331 min_low_pfn = PFN_UP(init_pg_tables_end);
332
333 find_max_pfn();
334
335 max_low_pfn = find_max_low_pfn();
336
337#ifdef CONFIG_HIGHMEM
338 highstart_pfn = highend_pfn = max_pfn;
339 if (max_pfn > max_low_pfn) {
340 highstart_pfn = max_low_pfn;
341 }
342 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
343 pages_to_mb(highend_pfn - highstart_pfn));
Jan Beulichba9c2312006-09-26 10:52:31 +0200344 num_physpages = highend_pfn;
345 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
346#else
347 num_physpages = max_low_pfn;
348 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
349#endif
350#ifdef CONFIG_FLATMEM
351 max_mapnr = num_physpages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352#endif
353 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
354 pages_to_mb(max_low_pfn));
355
356 setup_bootmem_allocator();
357
358 return max_low_pfn;
359}
360
361void __init zone_sizes_init(void)
362{
Mel Gorman6391af12006-10-11 01:20:39 -0700363 unsigned long max_zone_pfns[MAX_NR_ZONES];
364 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
365 max_zone_pfns[ZONE_DMA] =
366 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
367 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368#ifdef CONFIG_HIGHMEM
Mel Gorman6391af12006-10-11 01:20:39 -0700369 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
Mel Gorman4cfee882006-09-27 01:49:51 -0700370 add_active_range(0, 0, highend_pfn);
371#else
Mel Gorman4cfee882006-09-27 01:49:51 -0700372 add_active_range(0, 0, max_low_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373#endif
Mel Gorman4cfee882006-09-27 01:49:51 -0700374
375 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377#else
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700378extern unsigned long __init setup_memory(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379extern void zone_sizes_init(void);
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700380#endif /* !CONFIG_NEED_MULTIPLE_NODES */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382void __init setup_bootmem_allocator(void)
383{
384 unsigned long bootmap_size;
385 /*
386 * Initialize the boot-time allocator (with low memory only):
387 */
388 bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
389
390 register_bootmem_low_pages(max_low_pfn);
391
392 /*
393 * Reserve the bootmem bitmap itself as well. We do this in two
394 * steps (first step was init_bootmem()) because this catches
395 * the (very unlikely) case of us accidentally initializing the
396 * bootmem allocator with an invalid RAM area.
397 */
Eric W. Biederman8621b812006-12-07 02:14:03 +0100398 reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
399 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 /*
402 * reserve physical page 0 - it's a special BIOS page on many boxes,
403 * enabling clean reboots, SMP operation, laptop functions.
404 */
405 reserve_bootmem(0, PAGE_SIZE);
406
407 /* reserve EBDA region, it's a 4K region */
408 reserve_ebda_region();
409
410 /* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent
411 PCI prefetch into it (errata #56). Usually the page is reserved anyways,
412 unless you have no PS/2 mouse plugged in. */
413 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
414 boot_cpu_data.x86 == 6)
415 reserve_bootmem(0xa0000 - 4096, 4096);
416
417#ifdef CONFIG_SMP
418 /*
419 * But first pinch a few for the stack/trampoline stuff
420 * FIXME: Don't need the extra page at 4K, but need to fix
421 * trampoline before removing it. (see the GDT stuff)
422 */
423 reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
424#endif
Len Brown673d5b42007-07-28 03:33:16 -0400425#ifdef CONFIG_ACPI_SLEEP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 /*
427 * Reserve low memory region for sleep support.
428 */
429 acpi_reserve_bootmem();
430#endif
431#ifdef CONFIG_X86_FIND_SMP_CONFIG
432 /*
433 * Find and reserve possible boot-time SMP configuration:
434 */
435 find_smp_config();
436#endif
keith mannthey91023302006-09-25 23:31:03 -0700437 numa_kva_reserve();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438#ifdef CONFIG_BLK_DEV_INITRD
439 if (LOADER_TYPE && INITRD_START) {
440 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
441 reserve_bootmem(INITRD_START, INITRD_SIZE);
Henry Nestler19e5d9c2006-12-06 20:37:45 -0800442 initrd_start = INITRD_START + PAGE_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 initrd_end = initrd_start+INITRD_SIZE;
444 }
445 else {
446 printk(KERN_ERR "initrd extends beyond end of memory "
447 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
448 INITRD_START + INITRD_SIZE,
449 max_low_pfn << PAGE_SHIFT);
450 initrd_start = 0;
451 }
452 }
453#endif
Eric W. Biederman1bc3b912005-06-25 14:58:01 -0700454#ifdef CONFIG_KEXEC
455 if (crashk_res.start != crashk_res.end)
456 reserve_bootmem(crashk_res.start,
457 crashk_res.end - crashk_res.start + 1);
458#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
460
461/*
462 * The node 0 pgdat is initialized before all of these because
463 * it's needed for bootmem. node>0 pgdats have their virtual
464 * space allocated before the pagetables are in place to access
465 * them, so they can't be cleared then.
466 *
467 * This should all compile down to nothing when NUMA is off.
468 */
Adrian Bunk10079ae2007-07-21 17:10:27 +0200469static void __init remapped_pgdat_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
471 int nid;
472
473 for_each_online_node(nid) {
474 if (nid != 0)
475 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
476 }
477}
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479#ifdef CONFIG_MCA
480static void set_mca_bus(int x)
481{
482 MCA_bus = x;
483}
484#else
485static void set_mca_bus(int x) { }
486#endif
487
Rusty Russelld3561b72006-12-07 02:14:07 +0100488/* Overridden in paravirt.c if CONFIG_PARAVIRT */
Vivek Goyal88d20322007-01-11 01:52:44 +0100489char * __init __attribute__((weak)) memory_setup(void)
Rusty Russelld3561b72006-12-07 02:14:07 +0100490{
491 return machine_specific_memory_setup();
492}
493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494/*
495 * Determine if we were loaded by an EFI loader. If so, then we have also been
496 * passed the efi memmap, systab, etc., so we should use these data structures
497 * for initialization. Note, the efi init code path is determined by the
498 * global efi_enabled. This allows the same kernel image to be used on existing
499 * systems (with a traditional BIOS) as well as on EFI systems.
500 */
501void __init setup_arch(char **cmdline_p)
502{
503 unsigned long max_low_pfn;
504
505 memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
506 pre_setup_arch_hook();
507 early_cpu_init();
508
509 /*
510 * FIXME: This isn't an official loader_type right
511 * now but does currently work with elilo.
512 * If we were configured as an EFI kernel, check to make
513 * sure that we were loaded correctly from elilo and that
514 * the system table is valid. If not, then initialize normally.
515 */
516#ifdef CONFIG_EFI
517 if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
518 efi_enabled = 1;
519#endif
520
521 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 screen_info = SCREEN_INFO;
523 edid_info = EDID_INFO;
524 apm_info.bios = APM_BIOS_INFO;
525 ist_info = IST_INFO;
526 saved_videomode = VIDEO_MODE;
527 if( SYS_DESC_TABLE.length != 0 ) {
528 set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
529 machine_id = SYS_DESC_TABLE.table[0];
530 machine_submodel_id = SYS_DESC_TABLE.table[1];
531 BIOS_revision = SYS_DESC_TABLE.table[2];
532 }
533 bootloader_type = LOADER_TYPE;
534
535#ifdef CONFIG_BLK_DEV_RAM
536 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
537 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
538 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
539#endif
540 ARCH_SETUP
541 if (efi_enabled)
542 efi_init();
543 else {
544 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
Rusty Russelld3561b72006-12-07 02:14:07 +0100545 print_memory_map(memory_setup());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 }
547
548 copy_edd();
549
550 if (!MOUNT_ROOT_RDONLY)
551 root_mountflags &= ~MS_RDONLY;
552 init_mm.start_code = (unsigned long) _text;
553 init_mm.end_code = (unsigned long) _etext;
554 init_mm.end_data = (unsigned long) _edata;
555 init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
556
557 code_resource.start = virt_to_phys(_text);
558 code_resource.end = virt_to_phys(_etext)-1;
559 data_resource.start = virt_to_phys(_etext);
560 data_resource.end = virt_to_phys(_edata)-1;
561
Rusty Russell1a3f2392006-09-26 10:52:32 +0200562 parse_early_param();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Rusty Russell1a3f2392006-09-26 10:52:32 +0200564 if (user_defined_memmap) {
565 printk(KERN_INFO "user-defined physical RAM map:\n");
566 print_memory_map("user");
Stas Sergeev99b7de32006-03-23 02:59:41 -0800567 }
Rusty Russell1a3f2392006-09-26 10:52:32 +0200568
Alon Bar-Lev4e498b62007-02-12 00:54:11 -0800569 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
Rusty Russell1a3f2392006-09-26 10:52:32 +0200570 *cmdline_p = command_line;
Stas Sergeev99b7de32006-03-23 02:59:41 -0800571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 max_low_pfn = setup_memory();
573
Zachary Amsden7ce0bcf2007-02-13 13:26:21 +0100574#ifdef CONFIG_VMI
575 /*
576 * Must be after max_low_pfn is determined, and before kernel
577 * pagetables are setup.
578 */
579 vmi_init();
580#endif
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 /*
583 * NOTE: before this point _nobody_ is allowed to allocate
584 * any memory using the bootmem allocator. Although the
585 * alloctor is now initialised only the first 8Mb of the kernel
586 * virtual address space has been mapped. All allocations before
587 * paging_init() has completed must use the alloc_bootmem_low_pages()
588 * variant (which allocates DMA'able memory) and care must be taken
589 * not to exceed the 8Mb limit.
590 */
591
592#ifdef CONFIG_SMP
593 smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
594#endif
595 paging_init();
596 remapped_pgdat_init();
Andy Whitcroft05b79bd2005-06-23 00:07:57 -0700597 sparse_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 zone_sizes_init();
599
600 /*
601 * NOTE: at this point the bootmem allocator is fully available.
602 */
603
Jeremy Fitzhardinge6996d3b2007-07-17 18:37:03 -0700604 paravirt_post_allocator_init();
605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 dmi_scan_machine();
607
608#ifdef CONFIG_X86_GENERICARCH
Rusty Russell1a3f2392006-09-26 10:52:32 +0200609 generic_apic_probe();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610#endif
611 if (efi_enabled)
612 efi_map_memmap();
613
Len Brown888ba6c2005-08-24 12:07:20 -0400614#ifdef CONFIG_ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 /*
616 * Parse the ACPI tables for possible boot-time SMP configuration.
617 */
618 acpi_boot_table_init();
Andy Curridd44647b2006-06-08 00:43:38 -0700619#endif
620
Andi Kleenf157cbb2006-09-26 10:52:41 +0200621#ifdef CONFIG_PCI
Andy Curridd44647b2006-06-08 00:43:38 -0700622#ifdef CONFIG_X86_IO_APIC
623 check_acpi_pci(); /* Checks more than just ACPI actually */
624#endif
Andi Kleenf157cbb2006-09-26 10:52:41 +0200625#endif
Andy Curridd44647b2006-06-08 00:43:38 -0700626
627#ifdef CONFIG_ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 acpi_boot_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Venkatesh Pallipadi911a62d2005-09-03 15:56:31 -0700630#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
631 if (def_to_bigsmp)
632 printk(KERN_WARNING "More than 8 CPUs detected and "
633 "CONFIG_X86_PC cannot handle it.\nUse "
634 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
635#endif
636#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637#ifdef CONFIG_X86_LOCAL_APIC
638 if (smp_found_config)
639 get_smp_config();
640#endif
641
Yasunori Goto5c95da92006-12-22 01:09:54 -0800642 e820_register_memory();
Rafael J. Wysocki1c100702007-07-21 17:11:09 +0200643 e820_mark_nosave_regions();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645#ifdef CONFIG_VT
646#if defined(CONFIG_VGA_CONSOLE)
647 if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
648 conswitchp = &vga_con;
649#elif defined(CONFIG_DUMMY_CONSOLE)
650 conswitchp = &dummy_con;
651#endif
652#endif
653}