LXR linux/arch/score/kernel/setup.c

   1/*
   2 * arch/score/kernel/setup.c
   3 *
   4 * Score Processor version.
   5 *
   6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   7 *  Chen Liqin <liqin.chen@sunplusct.com>
   8 *  Lennox Wu <lennox.wu@sunplusct.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, see the file COPYING, or write
  22 * to the Free Software Foundation, Inc.,
  23 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24 */
  25
  26#include <linux/bootmem.h>
  27#include <linux/initrd.h>
  28#include <linux/ioport.h>
  29#include <linux/mm.h>
  30#include <linux/seq_file.h>
  31#include <linux/screen_info.h>
  32
  33#include <asm-generic/sections.h>
  34#include <asm/setup.h>
  35
  36struct screen_info screen_info;
  37unsigned long kernelsp;
  38
  39static char command_line[COMMAND_LINE_SIZE];
  40static struct resource code_resource = { .name = "Kernel code",};
  41static struct resource data_resource = { .name = "Kernel data",};
  42
  43static void __init bootmem_init(void)
  44{
  45        unsigned long start_pfn, bootmap_size;
  46        unsigned long size = initrd_end - initrd_start;
  47
  48        start_pfn = PFN_UP(__pa(&_end));
  49
  50        min_low_pfn = PFN_UP(MEMORY_START);
  51        max_low_pfn = PFN_UP(MEMORY_START + MEMORY_SIZE);
  52
  53        /* Initialize the boot-time allocator with low memory only. */
  54        bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
  55                                         min_low_pfn, max_low_pfn);
  56        add_active_range(0, min_low_pfn, max_low_pfn);
  57
  58        free_bootmem(PFN_PHYS(start_pfn),
  59                     (max_low_pfn - start_pfn) << PAGE_SHIFT);
  60        memory_present(0, start_pfn, max_low_pfn);
  61
  62        /* Reserve space for the bootmem bitmap. */
  63        reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
  64
  65        if (size == 0) {
  66                printk(KERN_INFO "Initrd not found or empty");
  67                goto disable;
  68        }
  69
  70        if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
  71                printk(KERN_ERR "Initrd extends beyond end of memory");
  72                goto disable;
  73        }
  74
  75        /* Reserve space for the initrd bitmap. */
  76        reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
  77        initrd_below_start_ok = 1;
  78
  79        pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
  80                 initrd_start, size);
  81        return;
  82disable:
  83        printk(KERN_CONT " - disabling initrd\n");
  84        initrd_start = 0;
  85        initrd_end = 0;
  86}
  87
  88static void __init resource_init(void)
  89{
  90        struct resource *res;
  91
  92        code_resource.start = __pa(&_text);
  93        code_resource.end = __pa(&_etext) - 1;
  94        data_resource.start = __pa(&_etext);
  95        data_resource.end = __pa(&_edata) - 1;
  96
  97        res = alloc_bootmem(sizeof(struct resource));
  98        res->name = "System RAM";
  99        res->start = MEMORY_START;
 100        res->end = MEMORY_START + MEMORY_SIZE - 1;
 101        res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 102        request_resource(&iomem_resource, res);
 103
 104        request_resource(res, &code_resource);
 105        request_resource(res, &data_resource);
 106}
 107
 108void __init setup_arch(char **cmdline_p)
 109{
 110        randomize_va_space = 0;
 111        *cmdline_p = command_line;
 112
 113        cpu_cache_init();
 114        tlb_init();
 115        bootmem_init();
 116        paging_init();
 117        resource_init();
 118}
 119
 120static int show_cpuinfo(struct seq_file *m, void *v)
 121{
 122        unsigned long n = (unsigned long) v - 1;
 123
 124        seq_printf(m, "processor\t\t: %ld\n", n);
 125        seq_printf(m, "\n");
 126
 127        return 0;
 128}
 129
 130static void *c_start(struct seq_file *m, loff_t *pos)
 131{
 132        unsigned long i = *pos;
 133
 134        return i < 1 ? (void *) (i + 1) : NULL;
 135}
 136
 137static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 138{
 139        ++*pos;
 140        return c_start(m, pos);
 141}
 142
 143static void c_stop(struct seq_file *m, void *v)
 144{
 145}
 146
 147const struct seq_operations cpuinfo_op = {
 148        .start  = c_start,
 149        .next   = c_next,
 150        .stop   = c_stop,
 151        .show   = show_cpuinfo,
 152};
 153
 154static int __init topology_init(void)
 155{
 156        return 0;
 157}
 158
 159subsys_initcall(topology_init);
 160