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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 | |
5 | * | |
6 | * $Id: head64.c,v 1.22 2001/07/06 14:28:20 ak Exp $ | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/linkage.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/percpu.h> | |
15 | ||
16 | #include <asm/processor.h> | |
17 | #include <asm/proto.h> | |
18 | #include <asm/smp.h> | |
19 | #include <asm/bootsetup.h> | |
20 | #include <asm/setup.h> | |
21 | #include <asm/desc.h> | |
22 | ||
23 | /* Don't add a printk in there. printk relies on the PDA which is not initialized | |
24 | yet. */ | |
25 | static void __init clear_bss(void) | |
26 | { | |
27 | extern char __bss_start[], __bss_end[]; | |
28 | memset(__bss_start, 0, | |
29 | (unsigned long) __bss_end - (unsigned long) __bss_start); | |
30 | } | |
31 | ||
32 | extern char x86_boot_params[2048]; | |
33 | ||
34 | #define NEW_CL_POINTER 0x228 /* Relative to real mode data */ | |
35 | #define OLD_CL_MAGIC_ADDR 0x90020 | |
36 | #define OLD_CL_MAGIC 0xA33F | |
37 | #define OLD_CL_BASE_ADDR 0x90000 | |
38 | #define OLD_CL_OFFSET 0x90022 | |
39 | ||
40 | extern char saved_command_line[]; | |
41 | ||
42 | static void __init copy_bootdata(char *real_mode_data) | |
43 | { | |
44 | int new_data; | |
45 | char * command_line; | |
46 | ||
47 | memcpy(x86_boot_params, real_mode_data, 2048); | |
48 | new_data = *(int *) (x86_boot_params + NEW_CL_POINTER); | |
49 | if (!new_data) { | |
50 | if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) { | |
51 | printk("so old bootloader that it does not support commandline?!\n"); | |
52 | return; | |
53 | } | |
54 | new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET; | |
55 | printk("old bootloader convention, maybe loadlin?\n"); | |
56 | } | |
57 | command_line = (char *) ((u64)(new_data)); | |
58 | memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); | |
59 | printk("Bootdata ok (command line is %s)\n", saved_command_line); | |
60 | } | |
61 | ||
62 | static void __init setup_boot_cpu_data(void) | |
63 | { | |
64 | unsigned int dummy, eax; | |
65 | ||
66 | /* get vendor info */ | |
67 | cpuid(0, (unsigned int *)&boot_cpu_data.cpuid_level, | |
68 | (unsigned int *)&boot_cpu_data.x86_vendor_id[0], | |
69 | (unsigned int *)&boot_cpu_data.x86_vendor_id[8], | |
70 | (unsigned int *)&boot_cpu_data.x86_vendor_id[4]); | |
71 | ||
72 | /* get cpu type */ | |
73 | cpuid(1, &eax, &dummy, &dummy, | |
74 | (unsigned int *) &boot_cpu_data.x86_capability); | |
75 | boot_cpu_data.x86 = (eax >> 8) & 0xf; | |
76 | boot_cpu_data.x86_model = (eax >> 4) & 0xf; | |
77 | boot_cpu_data.x86_mask = eax & 0xf; | |
78 | } | |
79 | ||
80 | extern char _end[]; | |
81 | ||
82 | void __init x86_64_start_kernel(char * real_mode_data) | |
83 | { | |
84 | char *s; | |
85 | int i; | |
86 | ||
87 | for (i = 0; i < 256; i++) | |
88 | set_intr_gate(i, early_idt_handler); | |
89 | asm volatile("lidt %0" :: "m" (idt_descr)); | |
90 | clear_bss(); | |
91 | pda_init(0); | |
92 | copy_bootdata(real_mode_data); | |
93 | #ifdef CONFIG_SMP | |
94 | cpu_set(0, cpu_online_map); | |
95 | #endif | |
96 | /* default console: */ | |
97 | if (!strstr(saved_command_line, "console=")) | |
98 | strcat(saved_command_line, " console=tty0"); | |
99 | s = strstr(saved_command_line, "earlyprintk="); | |
100 | if (s != NULL) | |
101 | setup_early_printk(s); | |
102 | #ifdef CONFIG_DISCONTIGMEM | |
103 | s = strstr(saved_command_line, "numa="); | |
104 | if (s != NULL) | |
105 | numa_setup(s+5); | |
106 | #endif | |
107 | #ifdef CONFIG_X86_IO_APIC | |
108 | if (strstr(saved_command_line, "disableapic")) | |
109 | disable_apic = 1; | |
110 | #endif | |
111 | /* You need early console to see that */ | |
112 | if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE) | |
113 | panic("Kernel too big for kernel mapping\n"); | |
114 | ||
115 | setup_boot_cpu_data(); | |
116 | start_kernel(); | |
117 | } |