2 * linux/arch/x86_64/kernel/head64.c -- prepare to run common code
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
6 * $Id: head64.c,v 1.22 2001/07/06 14:28:20 ak Exp $
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>
16 #include <asm/processor.h>
17 #include <asm/proto.h>
19 #include <asm/bootsetup.h>
20 #include <asm/setup.h>
23 /* Don't add a printk in there. printk relies on the PDA which is not initialized
25 static void __init clear_bss(void)
27 extern char __bss_start[], __bss_end[];
28 memset(__bss_start, 0,
29 (unsigned long) __bss_end - (unsigned long) __bss_start);
32 extern char x86_boot_params[2048];
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
40 extern char saved_command_line[];
42 static void __init copy_bootdata(char *real_mode_data)
47 memcpy(x86_boot_params, real_mode_data, 2048);
48 new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
50 if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
51 printk("so old bootloader that it does not support commandline?!\n");
54 new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
55 printk("old bootloader convention, maybe loadlin?\n");
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);
62 static void __init setup_boot_cpu_data(void)
67 cpuid(0, &boot_cpu_data.cpuid_level,
68 (int *)&boot_cpu_data.x86_vendor_id[0],
69 (int *)&boot_cpu_data.x86_vendor_id[8],
70 (int *)&boot_cpu_data.x86_vendor_id[4]);
73 cpuid(1, &eax, &dummy, &dummy, (int *) &boot_cpu_data.x86_capability);
74 boot_cpu_data.x86 = (eax >> 8) & 0xf;
75 boot_cpu_data.x86_model = (eax >> 4) & 0xf;
76 boot_cpu_data.x86_mask = eax & 0xf;
81 void __init x86_64_start_kernel(char * real_mode_data)
86 for (i = 0; i < 256; i++)
87 set_intr_gate(i, early_idt_handler);
88 asm volatile("lidt %0" :: "m" (idt_descr));
91 copy_bootdata(real_mode_data);
93 cpu_set(0, cpu_online_map);
95 /* default console: */
96 if (!strstr(saved_command_line, "console="))
97 strcat(saved_command_line, " console=tty0");
98 s = strstr(saved_command_line, "earlyprintk=");
100 setup_early_printk(s);
101 #ifdef CONFIG_DISCONTIGMEM
102 s = strstr(saved_command_line, "numa=");
106 #ifdef CONFIG_X86_IO_APIC
107 if (strstr(saved_command_line, "disableapic"))
110 /* You need early console to see that */
111 if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
112 panic("Kernel too big for kernel mapping\n");
114 setup_boot_cpu_data();