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Commit | Line | Data |
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1da177e4 | 1 | /* |
835c34a1 | 2 | * prepare to run common code |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
1da177e4 LT |
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> | |
eaf76e8b | 13 | #include <linux/start_kernel.h> |
8b664aa6 | 14 | #include <linux/io.h> |
1da177e4 LT |
15 | |
16 | #include <asm/processor.h> | |
17 | #include <asm/proto.h> | |
18 | #include <asm/smp.h> | |
1da177e4 LT |
19 | #include <asm/setup.h> |
20 | #include <asm/desc.h> | |
f6c2e333 | 21 | #include <asm/pgtable.h> |
cfd243d4 | 22 | #include <asm/tlbflush.h> |
2bc0414e | 23 | #include <asm/sections.h> |
718fc13b | 24 | #include <asm/kdebug.h> |
75175278 | 25 | #include <asm/e820.h> |
3e1e9002 | 26 | #include <asm/trampoline.h> |
1da177e4 | 27 | |
cfd243d4 VG |
28 | static void __init zap_identity_mappings(void) |
29 | { | |
30 | pgd_t *pgd = pgd_offset_k(0UL); | |
31 | pgd_clear(pgd); | |
cd582896 | 32 | __flush_tlb_all(); |
cfd243d4 VG |
33 | } |
34 | ||
1da177e4 LT |
35 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
36 | yet. */ | |
37 | static void __init clear_bss(void) | |
38 | { | |
1da177e4 | 39 | memset(__bss_start, 0, |
2bc0414e | 40 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
41 | } |
42 | ||
1da177e4 LT |
43 | static void __init copy_bootdata(char *real_mode_data) |
44 | { | |
1da177e4 LT |
45 | char * command_line; |
46 | ||
30c82645 PA |
47 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
48 | if (boot_params.hdr.cmd_line_ptr) { | |
49 | command_line = __va(boot_params.hdr.cmd_line_ptr); | |
50 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); | |
1da177e4 | 51 | } |
1da177e4 LT |
52 | } |
53 | ||
1da177e4 LT |
54 | void __init x86_64_start_kernel(char * real_mode_data) |
55 | { | |
1da177e4 LT |
56 | int i; |
57 | ||
b4e0409a IM |
58 | /* |
59 | * Build-time sanity checks on the kernel image and module | |
60 | * area mappings. (these are purely build-time and produce no code) | |
61 | */ | |
62 | BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START); | |
63 | BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE); | |
64 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); | |
65 | BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0); | |
66 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); | |
67 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
68 | BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == | |
69 | (__START_KERNEL & PGDIR_MASK))); | |
66d4bdf2 | 70 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 71 | |
3df0af0e YL |
72 | /* clear bss before set_intr_gate with early_idt_handler */ |
73 | clear_bss(); | |
74 | ||
cfd243d4 VG |
75 | /* Make NULL pointers segfault */ |
76 | zap_identity_mappings(); | |
77 | ||
31eedd82 TG |
78 | /* Cleanup the over mapped high alias */ |
79 | cleanup_highmap(); | |
80 | ||
5524ea32 | 81 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { |
076f9776 | 82 | #ifdef CONFIG_EARLY_PRINTK |
8866cd9d | 83 | set_intr_gate(i, &early_idt_handlers[i]); |
076f9776 IM |
84 | #else |
85 | set_intr_gate(i, early_idt_handler); | |
86 | #endif | |
87 | } | |
9d1c6e7c | 88 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 89 | |
12544697 | 90 | if (console_loglevel == 10) |
91 | early_printk("Kernel alive\n"); | |
2148270c | 92 | |
f97013fd JF |
93 | x86_64_start_reservations(real_mode_data); |
94 | } | |
95 | ||
96 | void __init x86_64_start_reservations(char *real_mode_data) | |
97 | { | |
278c0eb7 | 98 | copy_bootdata(__va(real_mode_data)); |
9de819fe | 99 | |
3e1e9002 RW |
100 | reserve_trampoline_memory(); |
101 | ||
93dbda7c | 102 | reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); |
75175278 | 103 | |
2b8106a0 | 104 | #ifdef CONFIG_BLK_DEV_INITRD |
75175278 AK |
105 | /* Reserve INITRD */ |
106 | if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { | |
107 | unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; | |
108 | unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; | |
109 | unsigned long ramdisk_end = ramdisk_image + ramdisk_size; | |
25eff8d4 | 110 | reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); |
75175278 | 111 | } |
2b8106a0 | 112 | #endif |
75175278 | 113 | |
816c25e7 | 114 | x86_init.resources.reserve_ebda_region(); |
75175278 AK |
115 | |
116 | /* | |
117 | * At this point everything still needed from the boot loader | |
118 | * or BIOS or kernel text should be early reserved or marked not | |
119 | * RAM in e820. All other memory is free game. | |
120 | */ | |
121 | ||
1da177e4 LT |
122 | start_kernel(); |
123 | } |