2 * linux/arch/x86_64/kernel/head64.c -- prepare to run common code
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
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>
14 #include <asm/processor.h>
15 #include <asm/proto.h>
17 #include <asm/bootsetup.h>
18 #include <asm/setup.h>
20 #include <asm/pgtable.h>
21 #include <asm/sections.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 memset(__bss_start, 0,
28 (unsigned long) __bss_stop - (unsigned long) __bss_start);
31 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */
32 #define OLD_CL_MAGIC_ADDR 0x90020
33 #define OLD_CL_MAGIC 0xA33F
34 #define OLD_CL_BASE_ADDR 0x90000
35 #define OLD_CL_OFFSET 0x90022
37 extern char saved_command_line[];
39 static void __init copy_bootdata(char *real_mode_data)
44 memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE);
45 new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
47 if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
48 printk("so old bootloader that it does not support commandline?!\n");
51 new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
52 printk("old bootloader convention, maybe loadlin?\n");
54 command_line = (char *) ((u64)(new_data));
55 memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
56 printk("Bootdata ok (command line is %s)\n", saved_command_line);
59 static void __init setup_boot_cpu_data(void)
61 unsigned int dummy, eax;
64 cpuid(0, (unsigned int *)&boot_cpu_data.cpuid_level,
65 (unsigned int *)&boot_cpu_data.x86_vendor_id[0],
66 (unsigned int *)&boot_cpu_data.x86_vendor_id[8],
67 (unsigned int *)&boot_cpu_data.x86_vendor_id[4]);
70 cpuid(1, &eax, &dummy, &dummy,
71 (unsigned int *) &boot_cpu_data.x86_capability);
72 boot_cpu_data.x86 = (eax >> 8) & 0xf;
73 boot_cpu_data.x86_model = (eax >> 4) & 0xf;
74 boot_cpu_data.x86_mask = eax & 0xf;
77 void __init x86_64_start_kernel(char * real_mode_data)
82 for (i = 0; i < 256; i++)
83 set_intr_gate(i, early_idt_handler);
84 asm volatile("lidt %0" :: "m" (idt_descr));
88 * switch to init_level4_pgt from boot_level4_pgt
90 memcpy(init_level4_pgt, boot_level4_pgt, PTRS_PER_PGD*sizeof(pgd_t));
91 asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt)));
93 for (i = 0; i < NR_CPUS; i++)
94 cpu_pda(i) = &boot_cpu_pda[i];
97 copy_bootdata(real_mode_data);
99 cpu_set(0, cpu_online_map);
101 s = strstr(saved_command_line, "earlyprintk=");
103 setup_early_printk(strchr(s, '=') + 1);
105 s = strstr(saved_command_line, "numa=");
109 #ifdef CONFIG_X86_IO_APIC
110 if (strstr(saved_command_line, "disableapic"))
113 /* You need early console to see that */
114 if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
115 panic("Kernel too big for kernel mapping\n");
117 setup_boot_cpu_data();