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 <asm/uaccess.h>
28 #include <asm/sections.h>
30 #include <asm/setup.h>
31 #include <asm/clock.h>
32 #include <asm/mmu_context.h>
34 extern void * __rd_start, * __rd_end;
41 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
42 * This value will be used at the very early stage of serial setup.
43 * The bigger value means no problem.
45 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
48 .loops_per_jiffy = 10000000,
51 EXPORT_SYMBOL(cpu_data);
54 * The machine vector. First entry in .machvec.init, or clobbered by
55 * sh_mv= on the command line, prior to .machvec.init teardown.
57 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
60 struct screen_info screen_info;
63 extern int root_mountflags;
66 * This is set up by the setup-routine at boot-time
68 #define PARAM ((unsigned char *)empty_zero_page)
70 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
71 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
72 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
73 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
74 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
75 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
77 #define COMMAND_LINE ((char *) (PARAM+0x100))
79 #define RAMDISK_IMAGE_START_MASK 0x07FF
80 #define RAMDISK_PROMPT_FLAG 0x8000
81 #define RAMDISK_LOAD_FLAG 0x4000
83 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
85 static struct resource code_resource = { .name = "Kernel code", };
86 static struct resource data_resource = { .name = "Kernel data", };
88 unsigned long memory_start;
89 EXPORT_SYMBOL(memory_start);
91 unsigned long memory_end;
92 EXPORT_SYMBOL(memory_end);
94 static int __init early_parse_mem(char *p)
98 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
99 size = memparse(p, &p);
100 memory_end = memory_start + size;
104 early_param("mem", early_parse_mem);
107 * Register fully available low RAM pages with the bootmem allocator.
109 static void __init register_bootmem_low_pages(void)
111 unsigned long curr_pfn, last_pfn, pages;
114 * We are rounding up the start address of usable memory:
116 curr_pfn = PFN_UP(__MEMORY_START);
119 * ... and at the end of the usable range downwards:
121 last_pfn = PFN_DOWN(__pa(memory_end));
123 if (last_pfn > max_low_pfn)
124 last_pfn = max_low_pfn;
126 pages = last_pfn - curr_pfn;
127 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
130 void __init setup_bootmem_allocator(unsigned long free_pfn)
132 unsigned long bootmap_size;
135 * Find a proper area for the bootmem bitmap. After this
136 * bootstrap step all allocations (until the page allocator
137 * is intact) must be done via bootmem_alloc().
139 bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
140 min_low_pfn, max_low_pfn);
142 add_active_range(0, min_low_pfn, max_low_pfn);
143 register_bootmem_low_pages();
148 * Reserve the kernel text and
149 * Reserve the bootmem bitmap. We do this in two steps (first step
150 * was init_bootmem()), because this catches the (definitely buggy)
151 * case of us accidentally initializing the bootmem allocator with
152 * an invalid RAM area.
154 reserve_bootmem(__MEMORY_START+PAGE_SIZE,
155 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
158 * reserve physical page 0 - it's a special BIOS page on many boxes,
159 * enabling clean reboots, SMP operation, laptop functions.
161 reserve_bootmem(__MEMORY_START, PAGE_SIZE);
163 sparse_memory_present_with_active_regions(0);
165 #ifdef CONFIG_BLK_DEV_INITRD
166 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
167 if (&__rd_start != &__rd_end) {
169 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
171 INITRD_SIZE = (unsigned long)&__rd_end -
172 (unsigned long)&__rd_start;
175 if (LOADER_TYPE && INITRD_START) {
176 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
177 reserve_bootmem(INITRD_START + __MEMORY_START,
179 initrd_start = INITRD_START + PAGE_OFFSET +
181 initrd_end = initrd_start + INITRD_SIZE;
183 printk("initrd extends beyond end of memory "
184 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
185 INITRD_START + INITRD_SIZE,
186 max_low_pfn << PAGE_SHIFT);
192 if (crashk_res.start != crashk_res.end)
193 reserve_bootmem(crashk_res.start,
194 crashk_res.end - crashk_res.start + 1);
198 #ifndef CONFIG_NEED_MULTIPLE_NODES
199 static void __init setup_memory(void)
201 unsigned long start_pfn;
204 * Partially used pages are not usable - thus
205 * we are rounding upwards:
207 start_pfn = PFN_UP(__pa(_end));
208 setup_bootmem_allocator(start_pfn);
211 extern void __init setup_memory(void);
214 void __init setup_arch(char **cmdline_p)
218 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
220 #ifdef CONFIG_BLK_DEV_RAM
221 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
222 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
223 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
226 if (!MOUNT_ROOT_RDONLY)
227 root_mountflags &= ~MS_RDONLY;
228 init_mm.start_code = (unsigned long) _text;
229 init_mm.end_code = (unsigned long) _etext;
230 init_mm.end_data = (unsigned long) _edata;
231 init_mm.brk = (unsigned long) _end;
233 code_resource.start = virt_to_phys(_text);
234 code_resource.end = virt_to_phys(_etext)-1;
235 data_resource.start = virt_to_phys(_etext);
236 data_resource.end = virt_to_phys(_edata)-1;
238 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
239 memory_end = memory_start + __MEMORY_SIZE;
241 #ifdef CONFIG_CMDLINE_BOOL
242 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
244 strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
247 /* Save unparsed command line copy for /proc/cmdline */
248 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
249 *cmdline_p = command_line;
256 * Find the highest page frame number we have available
258 max_pfn = PFN_DOWN(__pa(memory_end));
261 * Determine low and high memory ranges:
263 max_low_pfn = max_pfn;
264 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
266 nodes_clear(node_online_map);
268 /* Setup bootmem with available RAM */
272 #ifdef CONFIG_DUMMY_CONSOLE
273 conswitchp = &dummy_con;
276 /* Perform the machine specific initialisation */
277 if (likely(sh_mv.mv_setup))
278 sh_mv.mv_setup(cmdline_p);
283 static const char *cpu_name[] = {
284 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
285 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
286 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
287 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
288 [CPU_SH7712] = "SH7712", [CPU_SH7720] = "SH7720",
289 [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750",
290 [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R",
291 [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R",
292 [CPU_SH7760] = "SH7760",
293 [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1",
294 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
295 [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780",
296 [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343",
297 [CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722",
298 [CPU_SHX3] = "SH-X3", [CPU_SH_NONE] = "Unknown"
301 const char *get_cpu_subtype(struct sh_cpuinfo *c)
303 return cpu_name[c->type];
306 #ifdef CONFIG_PROC_FS
307 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
308 static const char *cpu_flags[] = {
309 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
310 "ptea", "llsc", "l2", "op32", NULL
313 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
317 seq_printf(m, "cpu flags\t:");
320 seq_printf(m, " %s\n", cpu_flags[0]);
324 for (i = 0; cpu_flags[i]; i++)
325 if ((c->flags & (1 << i)))
326 seq_printf(m, " %s", cpu_flags[i+1]);
331 static void show_cacheinfo(struct seq_file *m, const char *type,
332 struct cache_info info)
334 unsigned int cache_size;
336 cache_size = info.ways * info.sets * info.linesz;
338 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
339 type, cache_size >> 10, info.ways);
343 * Get CPU information for use by the procfs.
345 static int show_cpuinfo(struct seq_file *m, void *v)
347 struct sh_cpuinfo *c = v;
348 unsigned int cpu = c - cpu_data;
350 if (!cpu_online(cpu))
354 seq_printf(m, "machine\t\t: %s\n", get_system_type());
356 seq_printf(m, "processor\t: %d\n", cpu);
357 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
358 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
362 seq_printf(m, "cache type\t: ");
365 * Check for what type of cache we have, we support both the
366 * unified cache on the SH-2 and SH-3, as well as the harvard
367 * style cache on the SH-4.
369 if (c->icache.flags & SH_CACHE_COMBINED) {
370 seq_printf(m, "unified\n");
371 show_cacheinfo(m, "cache", c->icache);
373 seq_printf(m, "split (harvard)\n");
374 show_cacheinfo(m, "icache", c->icache);
375 show_cacheinfo(m, "dcache", c->dcache);
378 /* Optional secondary cache */
379 if (c->flags & CPU_HAS_L2_CACHE)
380 show_cacheinfo(m, "scache", c->scache);
382 seq_printf(m, "bogomips\t: %lu.%02lu\n",
383 c->loops_per_jiffy/(500000/HZ),
384 (c->loops_per_jiffy/(5000/HZ)) % 100);
389 static void *c_start(struct seq_file *m, loff_t *pos)
391 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
393 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
396 return c_start(m, pos);
398 static void c_stop(struct seq_file *m, void *v)
401 struct seq_operations cpuinfo_op = {
405 .show = show_cpuinfo,
407 #endif /* CONFIG_PROC_FS */