Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  prepare to run common code

 *

 *  Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE

 */

#include <linux/init.h>

#include <linux/linkage.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/percpu.h>

#include <asm/processor.h>

#include <asm/proto.h>

#include <asm/smp.h>

#include <asm/setup.h>

#include <asm/desc.h>

#include <asm/pgtable.h>

#include <asm/tlbflush.h>

#include <asm/sections.h>

static void __init zap_identity_mappings(void)

{

        pgd_t *pgd = pgd_offset_k(0UL);

        pgd_clear(pgd);

        __flush_tlb();

}

/* Don't add a printk in there. printk relies on the PDA which is not initialized

   yet. */

static void __init clear_bss(void)

{

        memset(__bss_start, 0,

               (unsigned long) __bss_stop - (unsigned long) __bss_start);

}

static void __init copy_bootdata(char *real_mode_data)

{

        char * command_line;

        memcpy(&boot_params, real_mode_data, sizeof boot_params);

        if (boot_params.hdr.cmd_line_ptr) {

                command_line = __va(boot_params.hdr.cmd_line_ptr);

                memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);

        }

}

void __init x86_64_start_kernel(char * real_mode_data)

{

        int i;

        /* clear bss before set_intr_gate with early_idt_handler */

        clear_bss();

        /* Make NULL pointers segfault */

        zap_identity_mappings();

        for (i = 0; i < IDT_ENTRIES; i++)

                set_intr_gate(i, early_idt_handler);

        load_idt((const struct desc_ptr *)&idt_descr);

        early_printk("Kernel alive\n");

        for (i = 0; i < NR_CPUS; i++)

                cpu_pda(i) = &boot_cpu_pda[i];

        pda_init(0);

        copy_bootdata(__va(real_mode_data));

#ifdef CONFIG_SMP

        cpu_set(0, cpu_online_map);

#endif

        start_kernel();

}