setup.c

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/*
 * Arch related setup for Hexagon
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/console.h>
#include <linux/of_fdt.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/processor.h>
#include <asm/hexagon_vm.h>
#include <asm/vm_mmu.h>
#include <asm/time.h>
#ifdef CONFIG_OF
#include <asm/prom.h>
#endif

char cmd_line[COMMAND_LINE_SIZE];
static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;

int on_simulator;

void __cpuinit calibrate_delay(void)
{
    loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
}

/*
 * setup_arch -  high level architectural setup routine
 * @cmdline_p: pointer to pointer to command-line arguments
 */

void __init setup_arch(char **cmdline_p)
{
    char *p = &external_cmdline_buffer;

    /*
     * These will eventually be pulled in via either some hypervisor
     * or devicetree description.  Hardwiring for now.
     */
    pcycle_freq_mhz = 600;
    thread_freq_mhz = 100;
    sleep_clk_freq = 32000;

    /*
     * Set up event bindings to handle exceptions and interrupts.
     */
    __vmsetvec(_K_VM_event_vector);

    /*
     * Simulator has a few differences from the hardware.
     * For now, check uninitialized-but-mapped memory
     * prior to invoking setup_arch_memory().
     */
    if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
        on_simulator = 1;
    else
        on_simulator = 0;

    if (p[0] != '\0')
        strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
    else
        strlcpy(boot_command_line, default_command_line,
            COMMAND_LINE_SIZE);

    /*
     * boot_command_line and the value set up by setup_arch
     * are both picked up by the init code. If no reason to
     * make them different, pass the same pointer back.
     */
    strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
    *cmdline_p = cmd_line;

    parse_early_param();

    setup_arch_memory();

#ifdef CONFIG_SMP
    smp_start_cpus();
#endif
}

/*
 * Functions for dumping CPU info via /proc
 * Probably should move to kernel/proc.c or something.
 */
static void *c_start(struct seq_file *m, loff_t *pos)
{
    return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
    ++*pos;
    return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

/*
 * Eventually this will dump information about
 * CPU properties like ISA level, TLB size, etc.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
    int cpu = (unsigned long) v - 1;

    seq_printf(m, "processor\t: %d\n", cpu);
    seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
    seq_printf(m, "BogoMips\t: %lu.%02lu\n",
        (loops_per_jiffy * HZ) / 500000,
        ((loops_per_jiffy * HZ) / 5000) % 100);
    seq_printf(m, "\n");
    return 0;
}

const struct seq_operations cpuinfo_op = {
    .start  = &c_start,
    .next   = &c_next,
    .stop   = &c_stop,
    .show   = &show_cpuinfo,
};