Linux Kernel  3.7.1
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setup.c
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1 /*
2  * arch/sh/kernel/setup.c
3  *
4  * This file handles the architecture-dependent parts of initialization
5  *
6  * Copyright (C) 1999 Niibe Yutaka
7  * Copyright (C) 2002 - 2010 Paul Mundt
8  */
9 #include <linux/screen_info.h>
10 #include <linux/ioport.h>
11 #include <linux/init.h>
12 #include <linux/initrd.h>
13 #include <linux/bootmem.h>
14 #include <linux/console.h>
15 #include <linux/root_dev.h>
16 #include <linux/utsname.h>
17 #include <linux/nodemask.h>
18 #include <linux/cpu.h>
19 #include <linux/pfn.h>
20 #include <linux/fs.h>
21 #include <linux/mm.h>
22 #include <linux/kexec.h>
23 #include <linux/module.h>
24 #include <linux/smp.h>
25 #include <linux/err.h>
26 #include <linux/crash_dump.h>
27 #include <linux/mmzone.h>
28 #include <linux/clk.h>
29 #include <linux/delay.h>
30 #include <linux/platform_device.h>
31 #include <linux/memblock.h>
32 #include <asm/uaccess.h>
33 #include <asm/io.h>
34 #include <asm/page.h>
35 #include <asm/elf.h>
36 #include <asm/sections.h>
37 #include <asm/irq.h>
38 #include <asm/setup.h>
39 #include <asm/clock.h>
40 #include <asm/smp.h>
41 #include <asm/mmu_context.h>
42 #include <asm/mmzone.h>
43 #include <asm/sparsemem.h>
44 
45 /*
46  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
47  * This value will be used at the very early stage of serial setup.
48  * The bigger value means no problem.
49  */
51  [0] = {
52  .type = CPU_SH_NONE,
53  .family = CPU_FAMILY_UNKNOWN,
54  .loops_per_jiffy = 10000000,
55  .phys_bits = MAX_PHYSMEM_BITS,
56  },
57 };
59 
60 /*
61  * The machine vector. First entry in .machvec.init, or clobbered by
62  * sh_mv= on the command line, prior to .machvec.init teardown.
63  */
64 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
65 EXPORT_SYMBOL(sh_mv);
66 
67 #ifdef CONFIG_VT
69 #endif
70 
71 extern int root_mountflags;
72 
73 #define RAMDISK_IMAGE_START_MASK 0x07FF
74 #define RAMDISK_PROMPT_FLAG 0x8000
75 #define RAMDISK_LOAD_FLAG 0x4000
76 
77 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
78 
79 static struct resource code_resource = {
80  .name = "Kernel code",
82 };
83 
84 static struct resource data_resource = {
85  .name = "Kernel data",
87 };
88 
89 static struct resource bss_resource = {
90  .name = "Kernel bss",
92 };
93 
94 unsigned long memory_start;
96 unsigned long memory_end = 0;
98 unsigned long memory_limit = 0;
99 
100 static struct resource mem_resources[MAX_NUMNODES];
101 
103 
104 static int __init early_parse_mem(char *p)
105 {
106  if (!p)
107  return 1;
108 
109  memory_limit = PAGE_ALIGN(memparse(p, &p));
110 
111  pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
112 
113  return 0;
114 }
115 early_param("mem", early_parse_mem);
116 
118 {
119 #ifdef CONFIG_BLK_DEV_INITRD
120  unsigned long start, end;
121 
122  /*
123  * Check for the rare cases where boot loaders adhere to the boot
124  * ABI.
125  */
126  if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
127  goto disable;
128 
129  start = INITRD_START + __MEMORY_START;
130  end = start + INITRD_SIZE;
131 
132  if (unlikely(end <= start))
133  goto disable;
134  if (unlikely(start & ~PAGE_MASK)) {
135  pr_err("initrd must be page aligned\n");
136  goto disable;
137  }
138 
139  if (unlikely(start < __MEMORY_START)) {
140  pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
141  start, __MEMORY_START);
142  goto disable;
143  }
144 
145  if (unlikely(end > memblock_end_of_DRAM())) {
146  pr_err("initrd extends beyond end of memory "
147  "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
148  end, (unsigned long)memblock_end_of_DRAM());
149  goto disable;
150  }
151 
152  /*
153  * If we got this far in spite of the boot loader's best efforts
154  * to the contrary, assume we actually have a valid initrd and
155  * fix up the root dev.
156  */
158 
159  /*
160  * Address sanitization
161  */
162  initrd_start = (unsigned long)__va(start);
164 
165  memblock_reserve(__pa(initrd_start), INITRD_SIZE);
166 
167  return;
168 
169 disable:
170  pr_info("initrd disabled\n");
171  initrd_start = initrd_end = 0;
172 #endif
173 }
174 
176 {
177  struct clk *clk = clk_get(NULL, "cpu_clk");
178 
179  if (IS_ERR(clk))
180  panic("Need a sane CPU clock definition!");
181 
182  loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
183 
184  printk(KERN_INFO "Calibrating delay loop (skipped)... "
185  "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
186  loops_per_jiffy/(500000/HZ),
187  (loops_per_jiffy/(5000/HZ)) % 100,
189 }
190 
191 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
192  unsigned long end_pfn)
193 {
194  struct resource *res = &mem_resources[nid];
195  unsigned long start, end;
196 
197  WARN_ON(res->name); /* max one active range per node for now */
198 
199  start = start_pfn << PAGE_SHIFT;
200  end = end_pfn << PAGE_SHIFT;
201 
202  res->name = "System RAM";
203  res->start = start;
204  res->end = end - 1;
206 
207  if (request_resource(&iomem_resource, res)) {
208  pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
209  start_pfn, end_pfn);
210  return;
211  }
212 
213  /*
214  * We don't know which RAM region contains kernel data or
215  * the reserved crashkernel region, so try it repeatedly
216  * and let the resource manager test it.
217  */
218  request_resource(res, &code_resource);
219  request_resource(res, &data_resource);
220  request_resource(res, &bss_resource);
221 #ifdef CONFIG_KEXEC
223 #endif
224 
225  /*
226  * Also make sure that there is a PMB mapping that covers this
227  * range before we attempt to activate it, to avoid reset by MMU.
228  * We can hit this path with NUMA or memory hot-add.
229  */
230  pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
231  PAGE_KERNEL);
232 
233  memblock_set_node(PFN_PHYS(start_pfn),
234  PFN_PHYS(end_pfn - start_pfn), nid);
235 }
236 
238 {
239 }
240 
241 void __init setup_arch(char **cmdline_p)
242 {
243  enable_mmu();
244 
245  ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
246 
247  printk(KERN_NOTICE "Boot params:\n"
248  "... MOUNT_ROOT_RDONLY - %08lx\n"
249  "... RAMDISK_FLAGS - %08lx\n"
250  "... ORIG_ROOT_DEV - %08lx\n"
251  "... LOADER_TYPE - %08lx\n"
252  "... INITRD_START - %08lx\n"
253  "... INITRD_SIZE - %08lx\n",
257 
258 #ifdef CONFIG_BLK_DEV_RAM
262 #endif
263 
264  if (!MOUNT_ROOT_RDONLY)
266  init_mm.start_code = (unsigned long) _text;
267  init_mm.end_code = (unsigned long) _etext;
268  init_mm.end_data = (unsigned long) _edata;
269  init_mm.brk = (unsigned long) _end;
270 
271  code_resource.start = virt_to_phys(_text);
272  code_resource.end = virt_to_phys(_etext)-1;
273  data_resource.start = virt_to_phys(_etext);
274  data_resource.end = virt_to_phys(_edata)-1;
275  bss_resource.start = virt_to_phys(__bss_start);
276  bss_resource.end = virt_to_phys(__bss_stop)-1;
277 
278 #ifdef CONFIG_CMDLINE_OVERWRITE
279  strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
280 #else
282 #ifdef CONFIG_CMDLINE_EXTEND
283  strlcat(command_line, " ", sizeof(command_line));
284  strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
285 #endif
286 #endif
287 
288  /* Save unparsed command line copy for /proc/cmdline */
290  *cmdline_p = command_line;
291 
293 
295 
296  sh_mv_setup();
297 
298  /* Let earlyprintk output early console messages */
299  early_platform_driver_probe("earlyprintk", 1, 1);
300 
301  paging_init();
302 
303 #ifdef CONFIG_DUMMY_CONSOLE
305 #endif
306 
307  /* Perform the machine specific initialisation */
308  if (likely(sh_mv.mv_setup))
309  sh_mv.mv_setup(cmdline_p);
310 
311  plat_smp_setup();
312 }
313 
314 /* processor boot mode configuration */
316 {
317  pr_warning("generic_mode_pins(): missing mode pin configuration\n");
318  return 0;
319 }
320 
322 {
323  return sh_mv.mv_mode_pins() & pin;
324 }