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
  37 struct screen_info screen_info;
  38 unsigned long kernelsp;
  39
  40 static char command_line[COMMAND_LINE_SIZE];
  41 static struct resource code_resource = { .name = "Kernel code",};
  42 static struct resource data_resource = { .name = "Kernel data",};
  43
  44 static 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;
  85 disable:
  86         printk(KERN_CONT " - disabling initrd\n");
  87         initrd_start = 0;
  88         initrd_end = 0;
  89 }
  90
  91 static 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_SYSTEM_RAM | IORESOURCE_BUSY;
 105         request_resource(&iomem_resource, res);
 106
 107         request_resource(res, &code_resource);
 108         request_resource(res, &data_resource);
 109 }
 110
 111 void __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
 123 static 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
 133 static 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
 140 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 141 {
 142         ++*pos;
 143         return c_start(m, pos);
 144 }
 145
 146 static void c_stop(struct seq_file *m, void *v)
 147 {
 148 }
 149
 150 const struct seq_operations cpuinfo_op = {
 151         .start  = c_start,
 152         .next   = c_next,
 153         .stop   = c_stop,
 154         .show   = show_cpuinfo,
 155 };
 156
 157 static int __init topology_init(void)
 158 {
 159         return 0;
 160 }
 161
 162 subsys_initcall(topology_init);