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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> | |
13 | ||
14 | #include <asm/processor.h> | |
15 | #include <asm/proto.h> | |
16 | #include <asm/smp.h> | |
1da177e4 LT |
17 | #include <asm/setup.h> |
18 | #include <asm/desc.h> | |
f6c2e333 | 19 | #include <asm/pgtable.h> |
cfd243d4 | 20 | #include <asm/tlbflush.h> |
2bc0414e | 21 | #include <asm/sections.h> |
1da177e4 | 22 | |
cfd243d4 VG |
23 | static void __init zap_identity_mappings(void) |
24 | { | |
25 | pgd_t *pgd = pgd_offset_k(0UL); | |
26 | pgd_clear(pgd); | |
27 | __flush_tlb(); | |
28 | } | |
29 | ||
1da177e4 LT |
30 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
31 | yet. */ | |
32 | static void __init clear_bss(void) | |
33 | { | |
1da177e4 | 34 | memset(__bss_start, 0, |
2bc0414e | 35 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
36 | } |
37 | ||
1da177e4 LT |
38 | static void __init copy_bootdata(char *real_mode_data) |
39 | { | |
1da177e4 LT |
40 | char * command_line; |
41 | ||
30c82645 PA |
42 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
43 | if (boot_params.hdr.cmd_line_ptr) { | |
44 | command_line = __va(boot_params.hdr.cmd_line_ptr); | |
45 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); | |
1da177e4 | 46 | } |
1da177e4 LT |
47 | } |
48 | ||
1da177e4 LT |
49 | void __init x86_64_start_kernel(char * real_mode_data) |
50 | { | |
1da177e4 LT |
51 | int i; |
52 | ||
3df0af0e YL |
53 | /* clear bss before set_intr_gate with early_idt_handler */ |
54 | clear_bss(); | |
55 | ||
cfd243d4 VG |
56 | /* Make NULL pointers segfault */ |
57 | zap_identity_mappings(); | |
58 | ||
3df0af0e | 59 | for (i = 0; i < IDT_ENTRIES; i++) |
1da177e4 LT |
60 | set_intr_gate(i, early_idt_handler); |
61 | asm volatile("lidt %0" :: "m" (idt_descr)); | |
f6c2e333 | 62 | |
43c85c9c | 63 | early_printk("Kernel alive\n"); |
2148270c | 64 | |
365ba917 RT |
65 | for (i = 0; i < NR_CPUS; i++) |
66 | cpu_pda(i) = &boot_cpu_pda[i]; | |
67 | ||
1da177e4 | 68 | pda_init(0); |
278c0eb7 | 69 | copy_bootdata(__va(real_mode_data)); |
1da177e4 LT |
70 | #ifdef CONFIG_SMP |
71 | cpu_set(0, cpu_online_map); | |
72 | #endif | |
1da177e4 LT |
73 | start_kernel(); |
74 | } |