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/memblock.h>
  30#include <linux/mm.h>
  31#include <linux/seq_file.h>
  32#include <linux/screen_info.h>
  33
  34#include <asm-generic/sections.h>
  35#include <asm/setup.h>
  36
  37struct screen_info screen_info;
  38unsigned long kernelsp;
  39
  40static char command_line[COMMAND_LINE_SIZE];
  41static struct resource code_resource = { .name = "Kernel code",};
  42static struct resource data_resource = { .name = "Kernel data",};
  43
  44static void __init bootmem_init(void)
  45{
  46        unsigned long start_pfn, bootmap_size;
  47        unsigned long size = initrd_end - initrd_start;
  48
  49        start_pfn = PFN_UP(__pa(&_end));
  50
  51        min_low_pfn = PFN_UP(MEMORY_START);
  52        max_low_pfn = PFN_UP(MEMORY_START + MEMORY_SIZE);
  53        max_mapnr = max_low_pfn - min_low_pfn;
  54
  55        /* Initialize the boot-time allocator with low memory only. */
  56        bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
  57                                         min_low_pfn, max_low_pfn);
  58        memblock_add_node(PFN_PHYS(min_low_pfn),
  59                          PFN_PHYS(max_low_pfn - min_low_pfn), 0);
  60
  61        free_bootmem(PFN_PHYS(start_pfn),
  62                     (max_low_pfn - start_pfn) << PAGE_SHIFT);
  63        memory_present(0, start_pfn, max_low_pfn);
  64
  65        /* Reserve space for the bootmem bitmap. */
  66        reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
  67
  68        if (size == 0) {
  69                printk(KERN_INFO "Initrd not found or empty");
  70                goto disable;
  71        }
  72
  73        if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
  74                printk(KERN_ERR "Initrd extends beyond end of memory");
  75                goto disable;
  76        }
  77
  78        /* Reserve space for the initrd bitmap. */
  79        reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
  80        initrd_below_start_ok = 1;
  81
  82        pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
  83                 initrd_start, size);
  84        return;
  85disable:
  86        printk(KERN_CONT " - disabling initrd\n");
  87        initrd_start = 0;
  88        initrd_end = 0;
  89}
  90
  91static void __init resource_init(void)
  92{
  93        struct resource *res;
  94
  95        code_resource.start = __pa(&_text);
  96        code_resource.end = __pa(&_etext) - 1;
  97        data_resource.start = __pa(&_etext);
  98        data_resource.end = __pa(&_edata) - 1;
  99
 100        res = alloc_bootmem(sizeof(struct resource));
 101        res->name = "System RAM";
 102        res->start = MEMORY_START;
 103        res->end = MEMORY_START + MEMORY_SIZE - 1;
 104        res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 105        request_resource(&iomem_resource, res);
 106
 107        request_resource(res, &code_resource);
 108        request_resource(res, &data_resource);
 109}
 110
 111void __init setup_arch(char **cmdline_p)
 112{
 113        randomize_va_space = 0;
 114        *cmdline_p = command_line;
 115
 116        cpu_cache_init();
 117        tlb_init();
 118        bootmem_init();
 119        paging_init();
 120        resource_init();
 121}
 122
 123static int show_cpuinfo(struct seq_file *m, void *v)
 124{
 125        unsigned long n = (unsigned long) v - 1;
 126
 127        seq_printf(m, "processor\t\t: %ld\n", n);
 128        seq_printf(m, "\n");
 129
 130        return 0;
 131}
 132
 133static void *c_start(struct seq_file *m, loff_t *pos)
 134{
 135        unsigned long i = *pos;
 136
 137        return i < 1 ? (void *) (i + 1) : NULL;
 138}
 139
 140static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 141{
 142        ++*pos;
 143        return c_start(m, pos);
 144}
 145
 146static void c_stop(struct seq_file *m, void *v)
 147{
 148}
 149
 150const struct seq_operations cpuinfo_op = {
 151        .start  = c_start,
 152        .next   = c_next,
 153        .stop   = c_stop,
 154        .show   = show_cpuinfo,
 155};
 156
 157static int __init topology_init(void)
 158{
 159        return 0;
 160}
 161
 162subsys_initcall(topology_init);
 163