2 * arch/sh/kernel/setup.c
4 * This file handles the architecture-dependent parts of initialization
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 - 2007 Paul Mundt
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/seq_file.h>
16 #include <linux/root_dev.h>
17 #include <linux/utsname.h>
18 #include <linux/nodemask.h>
19 #include <linux/cpu.h>
20 #include <linux/pfn.h>
23 #include <linux/kexec.h>
24 #include <linux/module.h>
25 #include <linux/smp.h>
26 #include <linux/err.h>
27 #include <linux/debugfs.h>
28 #include <asm/uaccess.h>
32 #include <asm/sections.h>
34 #include <asm/setup.h>
35 #include <asm/clock.h>
36 #include <asm/mmu_context.h>
39 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
40 * This value will be used at the very early stage of serial setup.
41 * The bigger value means no problem.
43 struct sh_cpuinfo cpu_data
[NR_CPUS
] __read_mostly
= {
46 .loops_per_jiffy
= 10000000,
49 EXPORT_SYMBOL(cpu_data
);
52 * The machine vector. First entry in .machvec.init, or clobbered by
53 * sh_mv= on the command line, prior to .machvec.init teardown.
55 struct sh_machine_vector sh_mv
= { .mv_name
= "generic", };
58 struct screen_info screen_info
;
61 extern int root_mountflags
;
63 #define RAMDISK_IMAGE_START_MASK 0x07FF
64 #define RAMDISK_PROMPT_FLAG 0x8000
65 #define RAMDISK_LOAD_FLAG 0x4000
67 static char __initdata command_line
[COMMAND_LINE_SIZE
] = { 0, };
69 static struct resource code_resource
= {
70 .name
= "Kernel code",
71 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
74 static struct resource data_resource
= {
75 .name
= "Kernel data",
76 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
79 unsigned long memory_start
;
80 EXPORT_SYMBOL(memory_start
);
81 unsigned long memory_end
= 0;
82 EXPORT_SYMBOL(memory_end
);
84 int l1i_cache_shape
, l1d_cache_shape
, l2_cache_shape
;
86 static int __init
early_parse_mem(char *p
)
90 memory_start
= (unsigned long)__va(__MEMORY_START
);
91 size
= memparse(p
, &p
);
93 if (size
> __MEMORY_SIZE
) {
94 static char msg
[] __initdata
= KERN_ERR
95 "Using mem= to increase the size of kernel memory "
97 " Recompile the kernel with the correct value for "
98 "CONFIG_MEMORY_SIZE.\n";
103 memory_end
= memory_start
+ size
;
107 early_param("mem", early_parse_mem
);
110 * Register fully available low RAM pages with the bootmem allocator.
112 static void __init
register_bootmem_low_pages(void)
114 unsigned long curr_pfn
, last_pfn
, pages
;
117 * We are rounding up the start address of usable memory:
119 curr_pfn
= PFN_UP(__MEMORY_START
);
122 * ... and at the end of the usable range downwards:
124 last_pfn
= PFN_DOWN(__pa(memory_end
));
126 if (last_pfn
> max_low_pfn
)
127 last_pfn
= max_low_pfn
;
129 pages
= last_pfn
- curr_pfn
;
130 free_bootmem(PFN_PHYS(curr_pfn
), PFN_PHYS(pages
));
134 static void __init
reserve_crashkernel(void)
136 unsigned long long free_mem
;
137 unsigned long long crash_size
, crash_base
;
140 free_mem
= ((unsigned long long)max_low_pfn
- min_low_pfn
) << PAGE_SHIFT
;
142 ret
= parse_crashkernel(boot_command_line
, free_mem
,
143 &crash_size
, &crash_base
);
144 if (ret
== 0 && crash_size
) {
145 if (crash_base
<= 0) {
146 printk(KERN_INFO
"crashkernel reservation failed - "
147 "you have to specify a base address\n");
151 if (reserve_bootmem(crash_base
, crash_size
,
152 BOOTMEM_EXCLUSIVE
) < 0) {
153 printk(KERN_INFO
"crashkernel reservation failed - "
154 "memory is in use\n");
158 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
159 "for crashkernel (System RAM: %ldMB)\n",
160 (unsigned long)(crash_size
>> 20),
161 (unsigned long)(crash_base
>> 20),
162 (unsigned long)(free_mem
>> 20));
163 crashk_res
.start
= crash_base
;
164 crashk_res
.end
= crash_base
+ crash_size
- 1;
168 static inline void __init
reserve_crashkernel(void)
172 void __init
setup_bootmem_allocator(unsigned long free_pfn
)
174 unsigned long bootmap_size
;
177 * Find a proper area for the bootmem bitmap. After this
178 * bootstrap step all allocations (until the page allocator
179 * is intact) must be done via bootmem_alloc().
181 bootmap_size
= init_bootmem_node(NODE_DATA(0), free_pfn
,
182 min_low_pfn
, max_low_pfn
);
184 add_active_range(0, min_low_pfn
, max_low_pfn
);
185 register_bootmem_low_pages();
190 * Reserve the kernel text and
191 * Reserve the bootmem bitmap. We do this in two steps (first step
192 * was init_bootmem()), because this catches the (definitely buggy)
193 * case of us accidentally initializing the bootmem allocator with
194 * an invalid RAM area.
196 reserve_bootmem(__MEMORY_START
+PAGE_SIZE
,
197 (PFN_PHYS(free_pfn
)+bootmap_size
+PAGE_SIZE
-1)-__MEMORY_START
,
201 * reserve physical page 0 - it's a special BIOS page on many boxes,
202 * enabling clean reboots, SMP operation, laptop functions.
204 reserve_bootmem(__MEMORY_START
, PAGE_SIZE
, BOOTMEM_DEFAULT
);
206 sparse_memory_present_with_active_regions(0);
208 #ifdef CONFIG_BLK_DEV_INITRD
209 ROOT_DEV
= Root_RAM0
;
211 if (LOADER_TYPE
&& INITRD_START
) {
212 if (INITRD_START
+ INITRD_SIZE
<= (max_low_pfn
<< PAGE_SHIFT
)) {
213 reserve_bootmem(INITRD_START
+ __MEMORY_START
,
214 INITRD_SIZE
, BOOTMEM_DEFAULT
);
215 initrd_start
= INITRD_START
+ PAGE_OFFSET
+
217 initrd_end
= initrd_start
+ INITRD_SIZE
;
219 printk("initrd extends beyond end of memory "
220 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
221 INITRD_START
+ INITRD_SIZE
,
222 max_low_pfn
<< PAGE_SHIFT
);
228 reserve_crashkernel();
231 #ifndef CONFIG_NEED_MULTIPLE_NODES
232 static void __init
setup_memory(void)
234 unsigned long start_pfn
;
237 * Partially used pages are not usable - thus
238 * we are rounding upwards:
240 start_pfn
= PFN_UP(__pa(_end
));
241 setup_bootmem_allocator(start_pfn
);
244 extern void __init
setup_memory(void);
247 void __init
setup_arch(char **cmdline_p
)
251 ROOT_DEV
= old_decode_dev(ORIG_ROOT_DEV
);
253 #ifdef CONFIG_BLK_DEV_RAM
254 rd_image_start
= RAMDISK_FLAGS
& RAMDISK_IMAGE_START_MASK
;
255 rd_prompt
= ((RAMDISK_FLAGS
& RAMDISK_PROMPT_FLAG
) != 0);
256 rd_doload
= ((RAMDISK_FLAGS
& RAMDISK_LOAD_FLAG
) != 0);
259 if (!MOUNT_ROOT_RDONLY
)
260 root_mountflags
&= ~MS_RDONLY
;
261 init_mm
.start_code
= (unsigned long) _text
;
262 init_mm
.end_code
= (unsigned long) _etext
;
263 init_mm
.end_data
= (unsigned long) _edata
;
264 init_mm
.brk
= (unsigned long) _end
;
266 code_resource
.start
= virt_to_phys(_text
);
267 code_resource
.end
= virt_to_phys(_etext
)-1;
268 data_resource
.start
= virt_to_phys(_etext
);
269 data_resource
.end
= virt_to_phys(_edata
)-1;
271 memory_start
= (unsigned long)__va(__MEMORY_START
);
273 memory_end
= memory_start
+ __MEMORY_SIZE
;
275 #ifdef CONFIG_CMDLINE_BOOL
276 strlcpy(command_line
, CONFIG_CMDLINE
, sizeof(command_line
));
278 strlcpy(command_line
, COMMAND_LINE
, sizeof(command_line
));
281 /* Save unparsed command line copy for /proc/cmdline */
282 memcpy(boot_command_line
, command_line
, COMMAND_LINE_SIZE
);
283 *cmdline_p
= command_line
;
290 * Find the highest page frame number we have available
292 max_pfn
= PFN_DOWN(__pa(memory_end
));
295 * Determine low and high memory ranges:
297 max_low_pfn
= max_pfn
;
298 min_low_pfn
= __MEMORY_START
>> PAGE_SHIFT
;
300 nodes_clear(node_online_map
);
302 /* Setup bootmem with available RAM */
306 #ifdef CONFIG_DUMMY_CONSOLE
307 conswitchp
= &dummy_con
;
310 /* Perform the machine specific initialisation */
311 if (likely(sh_mv
.mv_setup
))
312 sh_mv
.mv_setup(cmdline_p
);
321 static const char *cpu_name
[] = {
322 [CPU_SH7203
] = "SH7203", [CPU_SH7263
] = "SH7263",
323 [CPU_SH7206
] = "SH7206", [CPU_SH7619
] = "SH7619",
324 [CPU_SH7705
] = "SH7705", [CPU_SH7706
] = "SH7706",
325 [CPU_SH7707
] = "SH7707", [CPU_SH7708
] = "SH7708",
326 [CPU_SH7709
] = "SH7709", [CPU_SH7710
] = "SH7710",
327 [CPU_SH7712
] = "SH7712", [CPU_SH7720
] = "SH7720",
328 [CPU_SH7721
] = "SH7721", [CPU_SH7729
] = "SH7729",
329 [CPU_SH7750
] = "SH7750", [CPU_SH7750S
] = "SH7750S",
330 [CPU_SH7750R
] = "SH7750R", [CPU_SH7751
] = "SH7751",
331 [CPU_SH7751R
] = "SH7751R", [CPU_SH7760
] = "SH7760",
332 [CPU_SH4_202
] = "SH4-202", [CPU_SH4_501
] = "SH4-501",
333 [CPU_SH7763
] = "SH7763", [CPU_SH7770
] = "SH7770",
334 [CPU_SH7780
] = "SH7780", [CPU_SH7781
] = "SH7781",
335 [CPU_SH7343
] = "SH7343", [CPU_SH7785
] = "SH7785",
336 [CPU_SH7722
] = "SH7722", [CPU_SHX3
] = "SH-X3",
337 [CPU_SH5_101
] = "SH5-101", [CPU_SH5_103
] = "SH5-103",
338 [CPU_MXG
] = "MX-G", [CPU_SH7723
] = "SH7723",
339 [CPU_SH7366
] = "SH7366", [CPU_SH_NONE
] = "Unknown"
342 const char *get_cpu_subtype(struct sh_cpuinfo
*c
)
344 return cpu_name
[c
->type
];
347 #ifdef CONFIG_PROC_FS
348 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
349 static const char *cpu_flags
[] = {
350 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
351 "ptea", "llsc", "l2", "op32", NULL
354 static void show_cpuflags(struct seq_file
*m
, struct sh_cpuinfo
*c
)
358 seq_printf(m
, "cpu flags\t:");
361 seq_printf(m
, " %s\n", cpu_flags
[0]);
365 for (i
= 0; cpu_flags
[i
]; i
++)
366 if ((c
->flags
& (1 << i
)))
367 seq_printf(m
, " %s", cpu_flags
[i
+1]);
372 static void show_cacheinfo(struct seq_file
*m
, const char *type
,
373 struct cache_info info
)
375 unsigned int cache_size
;
377 cache_size
= info
.ways
* info
.sets
* info
.linesz
;
379 seq_printf(m
, "%s size\t: %2dKiB (%d-way)\n",
380 type
, cache_size
>> 10, info
.ways
);
384 * Get CPU information for use by the procfs.
386 static int show_cpuinfo(struct seq_file
*m
, void *v
)
388 struct sh_cpuinfo
*c
= v
;
389 unsigned int cpu
= c
- cpu_data
;
391 if (!cpu_online(cpu
))
395 seq_printf(m
, "machine\t\t: %s\n", get_system_type());
397 seq_printf(m
, "processor\t: %d\n", cpu
);
398 seq_printf(m
, "cpu family\t: %s\n", init_utsname()->machine
);
399 seq_printf(m
, "cpu type\t: %s\n", get_cpu_subtype(c
));
403 seq_printf(m
, "cache type\t: ");
406 * Check for what type of cache we have, we support both the
407 * unified cache on the SH-2 and SH-3, as well as the harvard
408 * style cache on the SH-4.
410 if (c
->icache
.flags
& SH_CACHE_COMBINED
) {
411 seq_printf(m
, "unified\n");
412 show_cacheinfo(m
, "cache", c
->icache
);
414 seq_printf(m
, "split (harvard)\n");
415 show_cacheinfo(m
, "icache", c
->icache
);
416 show_cacheinfo(m
, "dcache", c
->dcache
);
419 /* Optional secondary cache */
420 if (c
->flags
& CPU_HAS_L2_CACHE
)
421 show_cacheinfo(m
, "scache", c
->scache
);
423 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
424 c
->loops_per_jiffy
/(500000/HZ
),
425 (c
->loops_per_jiffy
/(5000/HZ
)) % 100);
430 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
432 return *pos
< NR_CPUS
? cpu_data
+ *pos
: NULL
;
434 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
437 return c_start(m
, pos
);
439 static void c_stop(struct seq_file
*m
, void *v
)
442 const struct seq_operations cpuinfo_op
= {
446 .show
= show_cpuinfo
,
448 #endif /* CONFIG_PROC_FS */
450 struct dentry
*sh_debugfs_root
;
452 static int __init
sh_debugfs_init(void)
454 sh_debugfs_root
= debugfs_create_dir("sh", NULL
);
455 if (IS_ERR(sh_debugfs_root
))
456 return PTR_ERR(sh_debugfs_root
);
460 arch_initcall(sh_debugfs_init
);