Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Dave Jones | 835c34a | 2007-10-12 21:10:53 -0400 | [diff] [blame] | 2 | * prepare to run common code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | */ |
| 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 Gleixner | eaf76e8 | 2008-01-30 13:30:19 +0100 | [diff] [blame] | 13 | #include <linux/start_kernel.h> |
Huang, Ying | 8b664aa | 2008-03-28 10:49:44 +0800 | [diff] [blame] | 14 | #include <linux/io.h> |
Yinghai Lu | 72d7c3b | 2010-08-25 13:39:17 -0700 | [diff] [blame] | 15 | #include <linux/memblock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | #include <asm/processor.h> |
| 18 | #include <asm/proto.h> |
| 19 | #include <asm/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/setup.h> |
| 21 | #include <asm/desc.h> |
Siddha, Suresh B | f6c2e33 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 22 | #include <asm/pgtable.h> |
Vivek Goyal | cfd243d | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 23 | #include <asm/tlbflush.h> |
Andi Kleen | 2bc0414 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 24 | #include <asm/sections.h> |
Thomas Gleixner | 718fc13 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 25 | #include <asm/kdebug.h> |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 26 | #include <asm/e820.h> |
Rafael J. Wysocki | 3e1e900 | 2008-12-08 00:50:22 +0100 | [diff] [blame] | 27 | #include <asm/trampoline.h> |
Thomas Gleixner | 47a3d5d | 2009-08-29 15:03:59 +0200 | [diff] [blame] | 28 | #include <asm/bios_ebda.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Vivek Goyal | cfd243d | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 30 | static void __init zap_identity_mappings(void) |
| 31 | { |
| 32 | pgd_t *pgd = pgd_offset_k(0UL); |
| 33 | pgd_clear(pgd); |
Ingo Molnar | cd58289 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 34 | __flush_tlb_all(); |
Vivek Goyal | cfd243d | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 35 | } |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
| 38 | yet. */ |
| 39 | static void __init clear_bss(void) |
| 40 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | memset(__bss_start, 0, |
Andi Kleen | 2bc0414 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 42 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | } |
| 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | static void __init copy_bootdata(char *real_mode_data) |
| 46 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | char * command_line; |
| 48 | |
H. Peter Anvin | 30c8264 | 2007-10-15 17:13:22 -0700 | [diff] [blame] | 49 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | } |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | void __init x86_64_start_kernel(char * real_mode_data) |
| 57 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | int i; |
| 59 | |
Ingo Molnar | b4e0409 | 2008-02-21 13:45:16 +0100 | [diff] [blame] | 60 | /* |
| 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 Beulich | 66d4bdf | 2008-07-31 16:48:31 +0100 | [diff] [blame] | 72 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
Ingo Molnar | b4e0409 | 2008-02-21 13:45:16 +0100 | [diff] [blame] | 73 | |
Yinghai Lu | 3df0af0 | 2006-12-07 02:14:12 +0100 | [diff] [blame] | 74 | /* clear bss before set_intr_gate with early_idt_handler */ |
| 75 | clear_bss(); |
| 76 | |
Vivek Goyal | cfd243d | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 77 | /* Make NULL pointers segfault */ |
| 78 | zap_identity_mappings(); |
| 79 | |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 80 | /* Cleanup the over mapped high alias */ |
| 81 | cleanup_highmap(); |
| 82 | |
Jeremy Fitzhardinge | 67e87f0 | 2010-10-13 16:34:15 -0700 | [diff] [blame] | 83 | max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT; |
| 84 | |
Andi Kleen | 5524ea3 | 2008-03-11 02:23:20 +0100 | [diff] [blame] | 85 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { |
Ingo Molnar | 076f977 | 2008-01-30 13:33:06 +0100 | [diff] [blame] | 86 | #ifdef CONFIG_EARLY_PRINTK |
Roland McGrath | 8866cd9 | 2008-01-30 13:33:06 +0100 | [diff] [blame] | 87 | set_intr_gate(i, &early_idt_handlers[i]); |
Ingo Molnar | 076f977 | 2008-01-30 13:33:06 +0100 | [diff] [blame] | 88 | #else |
| 89 | set_intr_gate(i, early_idt_handler); |
| 90 | #endif |
| 91 | } |
Glauber de Oliveira Costa | 9d1c6e7 | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 92 | load_idt((const struct desc_ptr *)&idt_descr); |
Siddha, Suresh B | f6c2e33 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 93 | |
dcg | 1254469 | 2008-09-28 18:49:46 +0200 | [diff] [blame] | 94 | if (console_loglevel == 10) |
| 95 | early_printk("Kernel alive\n"); |
Ingo Molnar | 2148270 | 2006-07-03 00:24:57 -0700 | [diff] [blame] | 96 | |
Jeremy Fitzhardinge | f97013f | 2008-06-25 00:19:18 -0400 | [diff] [blame] | 97 | x86_64_start_reservations(real_mode_data); |
| 98 | } |
| 99 | |
| 100 | void __init x86_64_start_reservations(char *real_mode_data) |
| 101 | { |
Vivek Goyal | 278c0eb | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 102 | copy_bootdata(__va(real_mode_data)); |
Yinghai Lu | 9de819f | 2008-01-30 13:30:46 +0100 | [diff] [blame] | 103 | |
Yinghai Lu | 72d7c3b | 2010-08-25 13:39:17 -0700 | [diff] [blame] | 104 | memblock_init(); |
| 105 | |
Yinghai Lu | a9ce6bc | 2010-08-25 13:39:17 -0700 | [diff] [blame] | 106 | memblock_x86_reserve_range(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 107 | |
Yinghai Lu | 2b8106a | 2008-03-18 12:51:22 -0700 | [diff] [blame] | 108 | #ifdef CONFIG_BLK_DEV_INITRD |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 109 | /* Reserve INITRD */ |
| 110 | if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { |
Yinghai Lu | c967da6 | 2010-03-28 19:42:55 -0700 | [diff] [blame] | 111 | /* Assume only end is not page aligned */ |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 112 | unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; |
| 113 | unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; |
Yinghai Lu | c967da6 | 2010-03-28 19:42:55 -0700 | [diff] [blame] | 114 | unsigned long ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); |
Yinghai Lu | a9ce6bc | 2010-08-25 13:39:17 -0700 | [diff] [blame] | 115 | memblock_x86_reserve_range(ramdisk_image, ramdisk_end, "RAMDISK"); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 116 | } |
Yinghai Lu | 2b8106a | 2008-03-18 12:51:22 -0700 | [diff] [blame] | 117 | #endif |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 118 | |
Thomas Gleixner | 47a3d5d | 2009-08-29 15:03:59 +0200 | [diff] [blame] | 119 | reserve_ebda_region(); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 120 | |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | start_kernel(); |
| 128 | } |