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Linux/arch/score/kernel/setup.c

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  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);
163 

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