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