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 $
8 * Jun Nakajima <jun.nakajima@intel.com>
12 #include <linux/init.h>
13 #include <linux/linkage.h>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/percpu.h>
19 #include <asm/processor.h>
20 #include <asm/proto.h>
22 #include <asm/bootsetup.h>
23 #include <asm/setup.h>
26 unsigned long start_pfn;
28 /* Don't add a printk in there. printk relies on the PDA which is not initialized
31 static void __init clear_bss(void)
33 extern char __bss_start[], __bss_end[];
34 memset(__bss_start, 0,
35 (unsigned long) __bss_end - (unsigned long) __bss_start);
39 extern char x86_boot_params[2048];
41 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */
42 #define OLD_CL_MAGIC_ADDR 0x90020
43 #define OLD_CL_MAGIC 0xA33F
44 #define OLD_CL_BASE_ADDR 0x90000
45 #define OLD_CL_OFFSET 0x90022
47 extern char saved_command_line[];
50 static void __init copy_bootdata(char *real_mode_data)
55 memcpy(x86_boot_params, real_mode_data, 2048);
56 new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
58 if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
59 printk("so old bootloader that it does not support commandline?!\n");
62 new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
63 printk("old bootloader convention, maybe loadlin?\n");
65 command_line = (char *) ((u64)(new_data));
66 memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
67 printk("Bootdata ok (command line is %s)\n", saved_command_line);
71 static void __init setup_boot_cpu_data(void)
76 cpuid(0, &boot_cpu_data.cpuid_level,
77 (int *)&boot_cpu_data.x86_vendor_id[0],
78 (int *)&boot_cpu_data.x86_vendor_id[8],
79 (int *)&boot_cpu_data.x86_vendor_id[4]);
82 cpuid(1, &eax, &dummy, &dummy,
83 (unsigned int *) &boot_cpu_data.x86_capability);
84 boot_cpu_data.x86 = (eax >> 8) & 0xf;
85 boot_cpu_data.x86_model = (eax >> 4) & 0xf;
86 boot_cpu_data.x86_mask = eax & 0xf;
91 void __init x86_64_start_kernel(char * real_mode_data)
95 phys_to_machine_mapping = (u32 *)xen_start_info.mfn_list;
96 start_pfn = (__pa(xen_start_info.pt_base) >> PAGE_SHIFT) + xen_start_info.nr_pt_frames;
98 for (i = 0; i < 256; i++)
99 set_intr_gate(i, early_idt_handler);
101 asm volatile("lidt %0" :: "m" (idt_descr));
104 /* copy_bootdata(real_mode_data); */
106 cpu_set(0, cpu_online_map);
108 /* default console: */
109 if (!strstr(saved_command_line, "console="))
110 strcat(saved_command_line, " console=tty0");
112 s = strstr(saved_command_line, "earlyprintk=");
114 setup_early_printk(s);
117 #ifdef CONFIG_DISCONTIGMEM
118 s = strstr(saved_command_line, "numa=");
122 #ifdef CONFIG_X86_IO_APIC
123 if (strstr(saved_command_line, "disableapic"))
126 /* You need early console to see that */
127 if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
128 panic("Kernel too big for kernel mapping\n");
130 setup_boot_cpu_data();