2 * linux/arch/x86_64/kernel/head64.c -- prepare to run common code
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
6 * Jun Nakajima <jun.nakajima@intel.com>
10 #include <linux/init.h>
11 #include <linux/linkage.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/percpu.h>
16 #include <linux/module.h>
18 #include <asm/processor.h>
19 #include <asm/proto.h>
21 #include <asm/bootsetup.h>
22 #include <asm/setup.h>
24 #include <asm/pgtable.h>
25 #include <asm/sections.h>
27 unsigned long start_pfn;
29 /* Don't add a printk in there. printk relies on the PDA which is not initialized
32 static void __init clear_bss(void)
34 memset(__bss_start, 0,
35 (unsigned long) __bss_stop - (unsigned long) __bss_start);
39 #define NEW_CL_POINTER 0x228 /* Relative to real mode data */
40 #define OLD_CL_MAGIC_ADDR 0x90020
41 #define OLD_CL_MAGIC 0xA33F
42 #define OLD_CL_BASE_ADDR 0x90000
43 #define OLD_CL_OFFSET 0x90022
45 extern char saved_command_line[];
47 static void __init copy_bootdata(char *real_mode_data)
53 memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE);
54 new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
56 if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
57 printk("so old bootloader that it does not support commandline?!\n");
60 new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
61 printk("old bootloader convention, maybe loadlin?\n");
63 command_line = (char *) ((u64)(new_data));
64 memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
68 if ((max_cmdline = MAX_GUEST_CMDLINE) > COMMAND_LINE_SIZE)
69 max_cmdline = COMMAND_LINE_SIZE;
70 memcpy(saved_command_line, xen_start_info->cmd_line, max_cmdline);
71 saved_command_line[max_cmdline-1] = '\0';
73 printk("Bootdata ok (command line is %s)\n", saved_command_line);
76 static void __init setup_boot_cpu_data(void)
78 unsigned int dummy, eax;
81 cpuid(0, (unsigned int *)&boot_cpu_data.cpuid_level,
82 (unsigned int *)&boot_cpu_data.x86_vendor_id[0],
83 (unsigned int *)&boot_cpu_data.x86_vendor_id[8],
84 (unsigned int *)&boot_cpu_data.x86_vendor_id[4]);
87 cpuid(1, &eax, &dummy, &dummy,
88 (unsigned int *) &boot_cpu_data.x86_capability);
89 boot_cpu_data.x86 = (eax >> 8) & 0xf;
90 boot_cpu_data.x86_model = (eax >> 4) & 0xf;
91 boot_cpu_data.x86_mask = eax & 0xf;
94 #include <xen/interface/memory.h>
95 unsigned long *machine_to_phys_mapping;
96 EXPORT_SYMBOL(machine_to_phys_mapping);
97 unsigned int machine_to_phys_order;
98 EXPORT_SYMBOL(machine_to_phys_order);
100 void __init x86_64_start_kernel(char * real_mode_data)
102 struct xen_machphys_mapping mapping;
103 unsigned long machine_to_phys_nr_ents;
107 xen_start_info = (struct start_info *)real_mode_data;
108 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
109 phys_to_machine_mapping =
110 (unsigned long *)xen_start_info->mfn_list;
111 start_pfn = (__pa(xen_start_info->pt_base) >> PAGE_SHIFT) +
112 xen_start_info->nr_pt_frames;
115 machine_to_phys_mapping = (unsigned long *)MACH2PHYS_VIRT_START;
116 machine_to_phys_nr_ents = MACH2PHYS_NR_ENTRIES;
117 if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
118 machine_to_phys_mapping = (unsigned long *)mapping.v_start;
119 machine_to_phys_nr_ents = mapping.max_mfn + 1;
121 while ((1UL << machine_to_phys_order) < machine_to_phys_nr_ents )
122 machine_to_phys_order++;
125 for (i = 0; i < 256; i++)
126 set_intr_gate(i, early_idt_handler);
127 asm volatile("lidt %0" :: "m" (idt_descr));
131 * This must be called really, really early:
135 for (i = 0; i < NR_CPUS; i++)
136 cpu_pda(i) = &boot_cpu_pda[i];
139 copy_bootdata(real_mode_data);
141 cpu_set(0, cpu_online_map);
143 s = strstr(saved_command_line, "earlyprintk=");
145 setup_early_printk(strchr(s, '=') + 1);
147 s = strstr(saved_command_line, "numa=");
151 #ifdef CONFIG_X86_IO_APIC
152 if (strstr(saved_command_line, "disableapic"))
155 /* You need early console to see that */
156 if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
157 panic("Kernel too big for kernel mapping\n");
159 setup_boot_cpu_data();