Commit | Line | Data |
---|---|---|
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 | ||
5b09b287 JF |
42 | void __init x86_64_init_pda(void) |
43 | { | |
44 | _cpu_pda = __cpu_pda; | |
45 | cpu_pda(0) = &_boot_cpu_pda; | |
46 | pda_init(0); | |
47 | } | |
48 | ||
cfd243d4 VG |
49 | static void __init zap_identity_mappings(void) |
50 | { | |
51 | pgd_t *pgd = pgd_offset_k(0UL); | |
52 | pgd_clear(pgd); | |
cd582896 | 53 | __flush_tlb_all(); |
cfd243d4 VG |
54 | } |
55 | ||
1da177e4 LT |
56 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
57 | yet. */ | |
58 | static void __init clear_bss(void) | |
59 | { | |
1da177e4 | 60 | memset(__bss_start, 0, |
2bc0414e | 61 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
62 | } |
63 | ||
1da177e4 LT |
64 | static void __init copy_bootdata(char *real_mode_data) |
65 | { | |
1da177e4 LT |
66 | char * command_line; |
67 | ||
30c82645 PA |
68 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
69 | if (boot_params.hdr.cmd_line_ptr) { | |
70 | command_line = __va(boot_params.hdr.cmd_line_ptr); | |
71 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); | |
1da177e4 | 72 | } |
1da177e4 LT |
73 | } |
74 | ||
1da177e4 LT |
75 | void __init x86_64_start_kernel(char * real_mode_data) |
76 | { | |
1da177e4 LT |
77 | int i; |
78 | ||
b4e0409a IM |
79 | /* |
80 | * Build-time sanity checks on the kernel image and module | |
81 | * area mappings. (these are purely build-time and produce no code) | |
82 | */ | |
83 | BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START); | |
84 | BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE); | |
85 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); | |
86 | BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0); | |
87 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); | |
88 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
89 | BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == | |
90 | (__START_KERNEL & PGDIR_MASK))); | |
91 | ||
3df0af0e YL |
92 | /* clear bss before set_intr_gate with early_idt_handler */ |
93 | clear_bss(); | |
94 | ||
cfd243d4 VG |
95 | /* Make NULL pointers segfault */ |
96 | zap_identity_mappings(); | |
97 | ||
31eedd82 TG |
98 | /* Cleanup the over mapped high alias */ |
99 | cleanup_highmap(); | |
100 | ||
5524ea32 | 101 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { |
076f9776 | 102 | #ifdef CONFIG_EARLY_PRINTK |
8866cd9d | 103 | set_intr_gate(i, &early_idt_handlers[i]); |
076f9776 IM |
104 | #else |
105 | set_intr_gate(i, early_idt_handler); | |
106 | #endif | |
107 | } | |
9d1c6e7c | 108 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 109 | |
43c85c9c | 110 | early_printk("Kernel alive\n"); |
2148270c | 111 | |
5b09b287 | 112 | x86_64_init_pda(); |
3461b0af MT |
113 | |
114 | early_printk("Kernel really alive\n"); | |
115 | ||
f97013fd JF |
116 | x86_64_start_reservations(real_mode_data); |
117 | } | |
118 | ||
119 | void __init x86_64_start_reservations(char *real_mode_data) | |
120 | { | |
278c0eb7 | 121 | copy_bootdata(__va(real_mode_data)); |
9de819fe | 122 | |
25eff8d4 | 123 | reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS"); |
75175278 | 124 | |
2b8106a0 | 125 | #ifdef CONFIG_BLK_DEV_INITRD |
75175278 AK |
126 | /* Reserve INITRD */ |
127 | if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { | |
128 | unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; | |
129 | unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; | |
130 | unsigned long ramdisk_end = ramdisk_image + ramdisk_size; | |
25eff8d4 | 131 | reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); |
75175278 | 132 | } |
2b8106a0 | 133 | #endif |
75175278 | 134 | |
320a6b2e | 135 | reserve_ebda_region(); |
75175278 AK |
136 | |
137 | /* | |
138 | * At this point everything still needed from the boot loader | |
139 | * or BIOS or kernel text should be early reserved or marked not | |
140 | * RAM in e820. All other memory is free game. | |
141 | */ | |
142 | ||
1da177e4 LT |
143 | start_kernel(); |
144 | } |