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);