mirror of https://gitee.com/openkylin/linux.git
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/*
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* linux/arch/x86_64/kernel/head64.c -- prepare to run common code
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*
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* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
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*
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* $Id: head64.c,v 1.22 2001/07/06 14:28:20 ak Exp $
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/percpu.h>
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#include <asm/processor.h>
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#include <asm/proto.h>
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#include <asm/smp.h>
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#include <asm/bootsetup.h>
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#include <asm/setup.h>
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#include <asm/desc.h>
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#include <asm/pgtable.h>
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#include <asm/sections.h>
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/* Don't add a printk in there. printk relies on the PDA which is not initialized
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yet. */
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static void __init clear_bss(void)
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{
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memset(__bss_start, 0,
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(unsigned long) __bss_stop - (unsigned long) __bss_start);
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}
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#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
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#define OLD_CL_MAGIC_ADDR 0x90020
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#define OLD_CL_MAGIC 0xA33F
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#define OLD_CL_BASE_ADDR 0x90000
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#define OLD_CL_OFFSET 0x90022
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extern char saved_command_line[];
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static void __init copy_bootdata(char *real_mode_data)
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{
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int new_data;
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char * command_line;
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memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE);
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new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
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if (!new_data) {
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if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
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printk("so old bootloader that it does not support commandline?!\n");
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return;
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}
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new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
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printk("old bootloader convention, maybe loadlin?\n");
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}
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command_line = (char *) ((u64)(new_data));
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memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
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printk("Bootdata ok (command line is %s)\n", saved_command_line);
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}
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static void __init setup_boot_cpu_data(void)
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{
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unsigned int dummy, eax;
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/* get vendor info */
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cpuid(0, (unsigned int *)&boot_cpu_data.cpuid_level,
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(unsigned int *)&boot_cpu_data.x86_vendor_id[0],
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(unsigned int *)&boot_cpu_data.x86_vendor_id[8],
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(unsigned int *)&boot_cpu_data.x86_vendor_id[4]);
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/* get cpu type */
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cpuid(1, &eax, &dummy, &dummy,
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(unsigned int *) &boot_cpu_data.x86_capability);
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boot_cpu_data.x86 = (eax >> 8) & 0xf;
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boot_cpu_data.x86_model = (eax >> 4) & 0xf;
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boot_cpu_data.x86_mask = eax & 0xf;
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}
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void __init x86_64_start_kernel(char * real_mode_data)
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{
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char *s;
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int i;
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for (i = 0; i < 256; i++)
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set_intr_gate(i, early_idt_handler);
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asm volatile("lidt %0" :: "m" (idt_descr));
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clear_bss();
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/*
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* switch to init_level4_pgt from boot_level4_pgt
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*/
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memcpy(init_level4_pgt, boot_level4_pgt, PTRS_PER_PGD*sizeof(pgd_t));
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asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt)));
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pda_init(0);
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copy_bootdata(real_mode_data);
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#ifdef CONFIG_SMP
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cpu_set(0, cpu_online_map);
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#endif
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s = strstr(saved_command_line, "earlyprintk=");
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if (s != NULL)
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setup_early_printk(s);
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#ifdef CONFIG_NUMA
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s = strstr(saved_command_line, "numa=");
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if (s != NULL)
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numa_setup(s+5);
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#endif
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#ifdef CONFIG_X86_IO_APIC
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if (strstr(saved_command_line, "disableapic"))
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disable_apic = 1;
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#endif
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/* You need early console to see that */
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if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
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panic("Kernel too big for kernel mapping\n");
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setup_boot_cpu_data();
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start_kernel();
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}
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