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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Jones835c34a2007-10-12 21:10:53 -04002 * prepare to run common code
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 */
6
7#include <linux/init.h>
8#include <linux/linkage.h>
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/string.h>
12#include <linux/percpu.h>
Thomas Gleixnereaf76e82008-01-30 13:30:19 +010013#include <linux/start_kernel.h>
Huang, Ying8b664aa2008-03-28 10:49:44 +080014#include <linux/io.h>
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070015#include <linux/memblock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#include <asm/processor.h>
18#include <asm/proto.h>
19#include <asm/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <asm/setup.h>
21#include <asm/desc.h>
Siddha, Suresh Bf6c2e332005-11-05 17:25:53 +010022#include <asm/pgtable.h>
Vivek Goyalcfd243d2007-05-02 19:27:07 +020023#include <asm/tlbflush.h>
Andi Kleen2bc04142005-11-05 17:25:53 +010024#include <asm/sections.h>
Thomas Gleixner718fc132008-01-30 13:30:17 +010025#include <asm/kdebug.h>
Andi Kleen75175272008-01-30 13:33:17 +010026#include <asm/e820.h>
Rafael J. Wysocki3e1e9002008-12-08 00:50:22 +010027#include <asm/trampoline.h>
Thomas Gleixner47a3d5d2009-08-29 15:03:59 +020028#include <asm/bios_ebda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Vivek Goyalcfd243d2007-05-02 19:27:07 +020030static void __init zap_identity_mappings(void)
31{
32 pgd_t *pgd = pgd_offset_k(0UL);
33 pgd_clear(pgd);
Ingo Molnarcd582892008-01-30 13:33:54 +010034 __flush_tlb_all();
Vivek Goyalcfd243d2007-05-02 19:27:07 +020035}
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037/* Don't add a printk in there. printk relies on the PDA which is not initialized
38 yet. */
39static void __init clear_bss(void)
40{
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 memset(__bss_start, 0,
Andi Kleen2bc04142005-11-05 17:25:53 +010042 (unsigned long) __bss_stop - (unsigned long) __bss_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043}
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045static void __init copy_bootdata(char *real_mode_data)
46{
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 char * command_line;
48
H. Peter Anvin30c82642007-10-15 17:13:22 -070049 memcpy(&boot_params, real_mode_data, sizeof boot_params);
50 if (boot_params.hdr.cmd_line_ptr) {
51 command_line = __va(boot_params.hdr.cmd_line_ptr);
52 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070054}
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056void __init x86_64_start_kernel(char * real_mode_data)
57{
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 int i;
59
Ingo Molnarb4e04092008-02-21 13:45:16 +010060 /*
61 * Build-time sanity checks on the kernel image and module
62 * area mappings. (these are purely build-time and produce no code)
63 */
64 BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START);
65 BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE);
66 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
67 BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0);
68 BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
69 BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
70 BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
71 (__START_KERNEL & PGDIR_MASK)));
Jan Beulich66d4bdf2008-07-31 16:48:31 +010072 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
Ingo Molnarb4e04092008-02-21 13:45:16 +010073
Yinghai Lu3df0af02006-12-07 02:14:12 +010074 /* clear bss before set_intr_gate with early_idt_handler */
75 clear_bss();
76
Vivek Goyalcfd243d2007-05-02 19:27:07 +020077 /* Make NULL pointers segfault */
78 zap_identity_mappings();
79
Thomas Gleixner31eedd82008-02-15 17:29:12 +010080 /* Cleanup the over mapped high alias */
81 cleanup_highmap();
82
Jeremy Fitzhardinge67e87f02010-10-13 16:34:15 -070083 max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
84
Andi Kleen5524ea32008-03-11 02:23:20 +010085 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
Ingo Molnar076f9772008-01-30 13:33:06 +010086#ifdef CONFIG_EARLY_PRINTK
Roland McGrath8866cd92008-01-30 13:33:06 +010087 set_intr_gate(i, &early_idt_handlers[i]);
Ingo Molnar076f9772008-01-30 13:33:06 +010088#else
89 set_intr_gate(i, early_idt_handler);
90#endif
91 }
Glauber de Oliveira Costa9d1c6e72007-10-19 20:35:03 +020092 load_idt((const struct desc_ptr *)&idt_descr);
Siddha, Suresh Bf6c2e332005-11-05 17:25:53 +010093
dcg12544692008-09-28 18:49:46 +020094 if (console_loglevel == 10)
95 early_printk("Kernel alive\n");
Ingo Molnar21482702006-07-03 00:24:57 -070096
Jeremy Fitzhardingef97013f2008-06-25 00:19:18 -040097 x86_64_start_reservations(real_mode_data);
98}
99
100void __init x86_64_start_reservations(char *real_mode_data)
101{
Vivek Goyal278c0eb2007-05-02 19:27:07 +0200102 copy_bootdata(__va(real_mode_data));
Yinghai Lu9de819f2008-01-30 13:30:46 +0100103
Yinghai Lu72d7c3b2010-08-25 13:39:17 -0700104 memblock_init();
105
Yinghai Lua9ce6bc2010-08-25 13:39:17 -0700106 memblock_x86_reserve_range(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
Andi Kleen75175272008-01-30 13:33:17 +0100107
Yinghai Lu2b8106a2008-03-18 12:51:22 -0700108#ifdef CONFIG_BLK_DEV_INITRD
Andi Kleen75175272008-01-30 13:33:17 +0100109 /* Reserve INITRD */
110 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
Yinghai Luc967da62010-03-28 19:42:55 -0700111 /* Assume only end is not page aligned */
Andi Kleen75175272008-01-30 13:33:17 +0100112 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
113 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
Yinghai Luc967da62010-03-28 19:42:55 -0700114 unsigned long ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
Yinghai Lua9ce6bc2010-08-25 13:39:17 -0700115 memblock_x86_reserve_range(ramdisk_image, ramdisk_end, "RAMDISK");
Andi Kleen75175272008-01-30 13:33:17 +0100116 }
Yinghai Lu2b8106a2008-03-18 12:51:22 -0700117#endif
Andi Kleen75175272008-01-30 13:33:17 +0100118
Thomas Gleixner47a3d5d2009-08-29 15:03:59 +0200119 reserve_ebda_region();
Andi Kleen75175272008-01-30 13:33:17 +0100120
121 /*
122 * At this point everything still needed from the boot loader
123 * or BIOS or kernel text should be early reserved or marked not
124 * RAM in e820. All other memory is free game.
125 */
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 start_kernel();
128}