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
bootmem_init(void)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
resource_init(void)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_MEM | IORESOURCE_BUSY;
105 request_resource(&iomem_resource, res);
106
107 request_resource(res, &code_resource);
108 request_resource(res, &data_resource);
109 }
110
setup_arch(char ** cmdline_p)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
show_cpuinfo(struct seq_file * m,void * v)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
c_start(struct seq_file * m,loff_t * pos)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
c_next(struct seq_file * m,void * v,loff_t * pos)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
c_stop(struct seq_file * m,void * v)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
topology_init(void)157 static int __init topology_init(void)
158 {
159 return 0;
160 }
161
162 subsys_initcall(topology_init);
163