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> |
1da177e4 LT |
14 | |
15 | #include <asm/processor.h> | |
16 | #include <asm/proto.h> | |
17 | #include <asm/smp.h> | |
1da177e4 LT |
18 | #include <asm/setup.h> |
19 | #include <asm/desc.h> | |
f6c2e333 | 20 | #include <asm/pgtable.h> |
cfd243d4 | 21 | #include <asm/tlbflush.h> |
2bc0414e | 22 | #include <asm/sections.h> |
718fc13b | 23 | #include <asm/kdebug.h> |
75175278 | 24 | #include <asm/e820.h> |
1da177e4 | 25 | |
cfd243d4 VG |
26 | static void __init zap_identity_mappings(void) |
27 | { | |
28 | pgd_t *pgd = pgd_offset_k(0UL); | |
29 | pgd_clear(pgd); | |
cd582896 | 30 | __flush_tlb_all(); |
cfd243d4 VG |
31 | } |
32 | ||
1da177e4 LT |
33 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
34 | yet. */ | |
35 | static void __init clear_bss(void) | |
36 | { | |
1da177e4 | 37 | memset(__bss_start, 0, |
2bc0414e | 38 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
39 | } |
40 | ||
1da177e4 LT |
41 | static void __init copy_bootdata(char *real_mode_data) |
42 | { | |
1da177e4 LT |
43 | char * command_line; |
44 | ||
30c82645 PA |
45 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
46 | if (boot_params.hdr.cmd_line_ptr) { | |
47 | command_line = __va(boot_params.hdr.cmd_line_ptr); | |
48 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); | |
1da177e4 | 49 | } |
1da177e4 LT |
50 | } |
51 | ||
75175278 AK |
52 | #define EBDA_ADDR_POINTER 0x40E |
53 | ||
54 | static __init void reserve_ebda(void) | |
55 | { | |
56 | unsigned ebda_addr, ebda_size; | |
57 | ||
58 | /* | |
59 | * there is a real-mode segmented pointer pointing to the | |
60 | * 4K EBDA area at 0x40E | |
61 | */ | |
62 | ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER); | |
63 | ebda_addr <<= 4; | |
64 | ||
65 | if (!ebda_addr) | |
66 | return; | |
67 | ||
68 | ebda_size = *(unsigned short *)__va(ebda_addr); | |
69 | ||
70 | /* Round EBDA up to pages */ | |
71 | if (ebda_size == 0) | |
72 | ebda_size = 1; | |
73 | ebda_size <<= 10; | |
74 | ebda_size = round_up(ebda_size + (ebda_addr & ~PAGE_MASK), PAGE_SIZE); | |
75 | if (ebda_size > 64*1024) | |
76 | ebda_size = 64*1024; | |
77 | ||
78 | reserve_early(ebda_addr, ebda_addr + ebda_size); | |
79 | } | |
80 | ||
1da177e4 LT |
81 | void __init x86_64_start_kernel(char * real_mode_data) |
82 | { | |
1da177e4 LT |
83 | int i; |
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 | ||
076f9776 IM |
91 | for (i = 0; i < IDT_ENTRIES; i++) { |
92 | #ifdef CONFIG_EARLY_PRINTK | |
8866cd9d | 93 | set_intr_gate(i, &early_idt_handlers[i]); |
076f9776 IM |
94 | #else |
95 | set_intr_gate(i, early_idt_handler); | |
96 | #endif | |
97 | } | |
9d1c6e7c | 98 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 99 | |
43c85c9c | 100 | early_printk("Kernel alive\n"); |
2148270c | 101 | |
365ba917 RT |
102 | for (i = 0; i < NR_CPUS; i++) |
103 | cpu_pda(i) = &boot_cpu_pda[i]; | |
104 | ||
1da177e4 | 105 | pda_init(0); |
278c0eb7 | 106 | copy_bootdata(__va(real_mode_data)); |
9de819fe | 107 | |
75175278 AK |
108 | reserve_early(__pa_symbol(&_text), __pa_symbol(&_end)); |
109 | ||
110 | /* Reserve INITRD */ | |
111 | if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { | |
112 | unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; | |
113 | unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; | |
114 | unsigned long ramdisk_end = ramdisk_image + ramdisk_size; | |
115 | reserve_early(ramdisk_image, ramdisk_end); | |
116 | } | |
117 | ||
118 | reserve_ebda(); | |
119 | ||
120 | /* | |
121 | * At this point everything still needed from the boot loader | |
122 | * or BIOS or kernel text should be early reserved or marked not | |
123 | * RAM in e820. All other memory is free game. | |
124 | */ | |
125 | ||
1da177e4 LT |
126 | start_kernel(); |
127 | } |