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>
18 #include <linux/module.h>
20 #include <asm/processor.h>
21 #include <asm/proto.h>
23 #include <asm/bootsetup.h>
24 #include <asm/setup.h>
26 #include <asm/pgtable.h>
27 #include <asm/sections.h>
29 unsigned long start_pfn;
31 /* Don't add a printk in there. printk relies on the PDA which is not initialized
34 static void __init clear_bss(void)
36 memset(__bss_start, 0,
37 (unsigned long) __bss_stop - (unsigned long) __bss_start);
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[];
49 static void __init copy_bootdata(char *real_mode_data)
55 memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE);
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);
70 if ((max_cmdline = MAX_GUEST_CMDLINE) > COMMAND_LINE_SIZE)
71 max_cmdline = COMMAND_LINE_SIZE;
72 memcpy(saved_command_line, xen_start_info->cmd_line, max_cmdline);
73 saved_command_line[max_cmdline-1] = '\0';
75 printk("Bootdata ok (command line is %s)\n", saved_command_line);
78 static void __init setup_boot_cpu_data(void)
80 unsigned int dummy, eax;
83 cpuid(0, (unsigned int *)&boot_cpu_data.cpuid_level,
84 (unsigned int *)&boot_cpu_data.x86_vendor_id[0],
85 (unsigned int *)&boot_cpu_data.x86_vendor_id[8],
86 (unsigned int *)&boot_cpu_data.x86_vendor_id[4]);
89 cpuid(1, &eax, &dummy, &dummy,
90 (unsigned int *) &boot_cpu_data.x86_capability);
91 boot_cpu_data.x86 = (eax >> 8) & 0xf;
92 boot_cpu_data.x86_model = (eax >> 4) & 0xf;
93 boot_cpu_data.x86_mask = eax & 0xf;
96 #include <xen/interface/memory.h>
97 unsigned long *machine_to_phys_mapping;
98 EXPORT_SYMBOL(machine_to_phys_mapping);
99 unsigned int machine_to_phys_order;
100 EXPORT_SYMBOL(machine_to_phys_order);
102 void __init x86_64_start_kernel(char * real_mode_data)
104 struct xen_machphys_mapping mapping;
105 unsigned long machine_to_phys_nr_ents;
109 xen_start_info = (struct start_info *)real_mode_data;
110 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
111 phys_to_machine_mapping =
112 (unsigned long *)xen_start_info->mfn_list;
113 start_pfn = (__pa(xen_start_info->pt_base) >> PAGE_SHIFT) +
114 xen_start_info->nr_pt_frames;
118 machine_to_phys_mapping = (unsigned long *)MACH2PHYS_VIRT_START;
119 machine_to_phys_nr_ents = MACH2PHYS_NR_ENTRIES;
120 if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
121 machine_to_phys_mapping = (unsigned long *)mapping.v_start;
122 machine_to_phys_nr_ents = mapping.max_mfn + 1;
124 while ((1UL << machine_to_phys_order) < machine_to_phys_nr_ents )
125 machine_to_phys_order++;
128 for (i = 0; i < 256; i++)
129 set_intr_gate(i, early_idt_handler);
130 asm volatile("lidt %0" :: "m" (idt_descr));
133 for (i = 0; i < NR_CPUS; i++)
134 cpu_pda(i) = &boot_cpu_pda[i];
137 copy_bootdata(real_mode_data);
139 cpu_set(0, cpu_online_map);
141 s = strstr(saved_command_line, "earlyprintk=");
143 setup_early_printk(strchr(s, '=') + 1);
145 s = strstr(saved_command_line, "numa=");
149 #ifdef CONFIG_X86_IO_APIC
150 if (strstr(saved_command_line, "disableapic"))
153 /* You need early console to see that */
154 if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
155 panic("Kernel too big for kernel mapping\n");
157 setup_boot_cpu_data();