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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/kernel/head64.c -- prepare to run common code | |
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> | |
17 | #include <asm/bootsetup.h> | |
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> |
1da177e4 | 23 | |
cfd243d4 VG |
24 | static void __init zap_identity_mappings(void) |
25 | { | |
26 | pgd_t *pgd = pgd_offset_k(0UL); | |
27 | pgd_clear(pgd); | |
28 | __flush_tlb(); | |
29 | } | |
30 | ||
1da177e4 LT |
31 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
32 | yet. */ | |
33 | static void __init clear_bss(void) | |
34 | { | |
1da177e4 | 35 | memset(__bss_start, 0, |
2bc0414e | 36 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
37 | } |
38 | ||
1da177e4 | 39 | #define NEW_CL_POINTER 0x228 /* Relative to real mode data */ |
278c0eb7 | 40 | #define OLD_CL_MAGIC_ADDR 0x20 |
1da177e4 | 41 | #define OLD_CL_MAGIC 0xA33F |
278c0eb7 | 42 | #define OLD_CL_OFFSET 0x22 |
1da177e4 | 43 | |
1da177e4 LT |
44 | static void __init copy_bootdata(char *real_mode_data) |
45 | { | |
278c0eb7 | 46 | unsigned long new_data; |
1da177e4 LT |
47 | char * command_line; |
48 | ||
f9ba7053 | 49 | memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE); |
278c0eb7 | 50 | new_data = *(u32 *) (x86_boot_params + NEW_CL_POINTER); |
1da177e4 | 51 | if (!new_data) { |
278c0eb7 | 52 | if (OLD_CL_MAGIC != *(u16 *)(real_mode_data + OLD_CL_MAGIC_ADDR)) { |
1da177e4 LT |
53 | return; |
54 | } | |
278c0eb7 | 55 | new_data = __pa(real_mode_data) + *(u16 *)(real_mode_data + OLD_CL_OFFSET); |
1da177e4 | 56 | } |
278c0eb7 | 57 | command_line = __va(new_data); |
adf48856 | 58 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 LT |
59 | } |
60 | ||
1da177e4 LT |
61 | void __init x86_64_start_kernel(char * real_mode_data) |
62 | { | |
1da177e4 LT |
63 | int i; |
64 | ||
3df0af0e YL |
65 | /* clear bss before set_intr_gate with early_idt_handler */ |
66 | clear_bss(); | |
67 | ||
cfd243d4 VG |
68 | /* Make NULL pointers segfault */ |
69 | zap_identity_mappings(); | |
70 | ||
3df0af0e | 71 | for (i = 0; i < IDT_ENTRIES; i++) |
1da177e4 LT |
72 | set_intr_gate(i, early_idt_handler); |
73 | asm volatile("lidt %0" :: "m" (idt_descr)); | |
f6c2e333 | 74 | |
43c85c9c | 75 | early_printk("Kernel alive\n"); |
2148270c | 76 | |
365ba917 RT |
77 | for (i = 0; i < NR_CPUS; i++) |
78 | cpu_pda(i) = &boot_cpu_pda[i]; | |
79 | ||
1da177e4 | 80 | pda_init(0); |
278c0eb7 | 81 | copy_bootdata(__va(real_mode_data)); |
1da177e4 LT |
82 | #ifdef CONFIG_SMP |
83 | cpu_set(0, cpu_online_map); | |
84 | #endif | |
1da177e4 LT |
85 | start_kernel(); |
86 | } |