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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> |
356fa0c6 | 26 | #include <asm/bios_ebda.h> |
1da177e4 | 27 | |
3461b0af MT |
28 | /* boot cpu pda */ |
29 | static struct x8664_pda _boot_cpu_pda __read_mostly; | |
30 | ||
31 | #ifdef CONFIG_SMP | |
3461b0af | 32 | /* |
5deb0b2a MT |
33 | * We install an empty cpu_pda pointer table to indicate to early users |
34 | * (numa_set_node) that the cpu_pda pointer table for cpus other than | |
35 | * the boot cpu is not yet setup. | |
3461b0af MT |
36 | */ |
37 | static struct x8664_pda *__cpu_pda[NR_CPUS] __initdata; | |
38 | #else | |
3461b0af MT |
39 | static struct x8664_pda *__cpu_pda[NR_CPUS] __read_mostly; |
40 | #endif | |
41 | ||
cfd243d4 VG |
42 | static void __init zap_identity_mappings(void) |
43 | { | |
44 | pgd_t *pgd = pgd_offset_k(0UL); | |
45 | pgd_clear(pgd); | |
cd582896 | 46 | __flush_tlb_all(); |
cfd243d4 VG |
47 | } |
48 | ||
1da177e4 LT |
49 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
50 | yet. */ | |
51 | static void __init clear_bss(void) | |
52 | { | |
1da177e4 | 53 | memset(__bss_start, 0, |
2bc0414e | 54 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
55 | } |
56 | ||
1da177e4 LT |
57 | static void __init copy_bootdata(char *real_mode_data) |
58 | { | |
1da177e4 LT |
59 | char * command_line; |
60 | ||
30c82645 PA |
61 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
62 | if (boot_params.hdr.cmd_line_ptr) { | |
63 | command_line = __va(boot_params.hdr.cmd_line_ptr); | |
64 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); | |
1da177e4 | 65 | } |
1da177e4 LT |
66 | } |
67 | ||
1da177e4 LT |
68 | void __init x86_64_start_kernel(char * real_mode_data) |
69 | { | |
1da177e4 LT |
70 | int i; |
71 | ||
b4e0409a IM |
72 | /* |
73 | * Build-time sanity checks on the kernel image and module | |
74 | * area mappings. (these are purely build-time and produce no code) | |
75 | */ | |
76 | BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START); | |
77 | BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE); | |
78 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); | |
79 | BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0); | |
80 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); | |
81 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
82 | BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == | |
83 | (__START_KERNEL & PGDIR_MASK))); | |
84 | ||
3df0af0e YL |
85 | /* clear bss before set_intr_gate with early_idt_handler */ |
86 | clear_bss(); | |
87 | ||
cfd243d4 VG |
88 | /* Make NULL pointers segfault */ |
89 | zap_identity_mappings(); | |
90 | ||
31eedd82 TG |
91 | /* Cleanup the over mapped high alias */ |
92 | cleanup_highmap(); | |
93 | ||
5524ea32 | 94 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { |
076f9776 | 95 | #ifdef CONFIG_EARLY_PRINTK |
8866cd9d | 96 | set_intr_gate(i, &early_idt_handlers[i]); |
076f9776 IM |
97 | #else |
98 | set_intr_gate(i, early_idt_handler); | |
99 | #endif | |
100 | } | |
9d1c6e7c | 101 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 102 | |
43c85c9c | 103 | early_printk("Kernel alive\n"); |
2148270c | 104 | |
3461b0af MT |
105 | _cpu_pda = __cpu_pda; |
106 | cpu_pda(0) = &_boot_cpu_pda; | |
1da177e4 | 107 | pda_init(0); |
3461b0af MT |
108 | |
109 | early_printk("Kernel really alive\n"); | |
110 | ||
278c0eb7 | 111 | copy_bootdata(__va(real_mode_data)); |
9de819fe | 112 | |
25eff8d4 | 113 | reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS"); |
75175278 | 114 | |
2b8106a0 | 115 | #ifdef CONFIG_BLK_DEV_INITRD |
75175278 AK |
116 | /* Reserve INITRD */ |
117 | if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { | |
118 | unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; | |
119 | unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; | |
120 | unsigned long ramdisk_end = ramdisk_image + ramdisk_size; | |
25eff8d4 | 121 | reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); |
75175278 | 122 | } |
2b8106a0 | 123 | #endif |
75175278 | 124 | |
320a6b2e | 125 | reserve_ebda_region(); |
8b664aa6 | 126 | reserve_setup_data(); |
75175278 AK |
127 | |
128 | /* | |
129 | * At this point everything still needed from the boot loader | |
130 | * or BIOS or kernel text should be early reserved or marked not | |
131 | * RAM in e820. All other memory is free game. | |
132 | */ | |
133 | ||
1da177e4 LT |
134 | start_kernel(); |
135 | } |