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 <asm/uaccess.h>
27 #include <asm/sections.h>
29 #include <asm/setup.h>
30 #include <asm/clock.h>
31 #include <asm/mmu_context.h>
33 extern void * __rd_start, * __rd_end;
40 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
41 * This value will be used at the very early stage of serial setup.
42 * The bigger value means no problem.
44 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
47 * The machine vector. First entry in .machvec.init, or clobbered by
48 * sh_mv= on the command line, prior to .machvec.init teardown.
50 struct sh_machine_vector sh_mv = { .mv_name = "Unknown", };
53 struct screen_info screen_info;
56 extern int root_mountflags;
59 * This is set up by the setup-routine at boot-time
61 #define PARAM ((unsigned char *)empty_zero_page)
63 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
64 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
65 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
66 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
67 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
68 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
70 #define COMMAND_LINE ((char *) (PARAM+0x100))
72 #define RAMDISK_IMAGE_START_MASK 0x07FF
73 #define RAMDISK_PROMPT_FLAG 0x8000
74 #define RAMDISK_LOAD_FLAG 0x4000
76 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
78 static struct resource code_resource = { .name = "Kernel code", };
79 static struct resource data_resource = { .name = "Kernel data", };
81 unsigned long memory_start, memory_end;
83 static int __init early_parse_mem(char *p)
87 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
88 size = memparse(p, &p);
89 memory_end = memory_start + size;
93 early_param("mem", early_parse_mem);
96 * Register fully available low RAM pages with the bootmem allocator.
98 static void __init register_bootmem_low_pages(void)
100 unsigned long curr_pfn, last_pfn, pages;
103 * We are rounding up the start address of usable memory:
105 curr_pfn = PFN_UP(__MEMORY_START);
108 * ... and at the end of the usable range downwards:
110 last_pfn = PFN_DOWN(__pa(memory_end));
112 if (last_pfn > max_low_pfn)
113 last_pfn = max_low_pfn;
115 pages = last_pfn - curr_pfn;
116 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
119 void __init setup_bootmem_allocator(unsigned long start_pfn)
121 unsigned long bootmap_size;
124 * Find a proper area for the bootmem bitmap. After this
125 * bootstrap step all allocations (until the page allocator
126 * is intact) must be done via bootmem_alloc().
128 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
129 min_low_pfn, max_low_pfn);
131 register_bootmem_low_pages();
136 * Reserve the kernel text and
137 * Reserve the bootmem bitmap. We do this in two steps (first step
138 * was init_bootmem()), because this catches the (definitely buggy)
139 * case of us accidentally initializing the bootmem allocator with
140 * an invalid RAM area.
142 reserve_bootmem(__MEMORY_START+PAGE_SIZE,
143 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
146 * reserve physical page 0 - it's a special BIOS page on many boxes,
147 * enabling clean reboots, SMP operation, laptop functions.
149 reserve_bootmem(__MEMORY_START, PAGE_SIZE);
151 #ifdef CONFIG_BLK_DEV_INITRD
152 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
153 if (&__rd_start != &__rd_end) {
155 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
157 INITRD_SIZE = (unsigned long)&__rd_end -
158 (unsigned long)&__rd_start;
161 if (LOADER_TYPE && INITRD_START) {
162 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
163 reserve_bootmem(INITRD_START + __MEMORY_START,
165 initrd_start = INITRD_START + PAGE_OFFSET +
167 initrd_end = initrd_start + INITRD_SIZE;
169 printk("initrd extends beyond end of memory "
170 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
171 INITRD_START + INITRD_SIZE,
172 max_low_pfn << PAGE_SHIFT);
178 if (crashk_res.start != crashk_res.end)
179 reserve_bootmem(crashk_res.start,
180 crashk_res.end - crashk_res.start + 1);
184 #ifndef CONFIG_NEED_MULTIPLE_NODES
185 static void __init setup_memory(void)
187 unsigned long start_pfn;
190 * Partially used pages are not usable - thus
191 * we are rounding upwards:
193 start_pfn = PFN_UP(__pa(_end));
194 setup_bootmem_allocator(start_pfn);
197 extern void __init setup_memory(void);
200 void __init setup_arch(char **cmdline_p)
204 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
206 #ifdef CONFIG_BLK_DEV_RAM
207 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
208 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
209 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
212 if (!MOUNT_ROOT_RDONLY)
213 root_mountflags &= ~MS_RDONLY;
214 init_mm.start_code = (unsigned long) _text;
215 init_mm.end_code = (unsigned long) _etext;
216 init_mm.end_data = (unsigned long) _edata;
217 init_mm.brk = (unsigned long) _end;
219 code_resource.start = virt_to_phys(_text);
220 code_resource.end = virt_to_phys(_etext)-1;
221 data_resource.start = virt_to_phys(_etext);
222 data_resource.end = virt_to_phys(_edata)-1;
224 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
225 memory_end = memory_start + __MEMORY_SIZE;
227 #ifdef CONFIG_CMDLINE_BOOL
228 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
230 strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
233 /* Save unparsed command line copy for /proc/cmdline */
234 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
235 *cmdline_p = command_line;
242 * Find the highest page frame number we have available
244 max_pfn = PFN_DOWN(__pa(memory_end));
247 * Determine low and high memory ranges:
249 max_low_pfn = max_pfn;
250 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
252 nodes_clear(node_online_map);
257 #ifdef CONFIG_DUMMY_CONSOLE
258 conswitchp = &dummy_con;
261 /* Perform the machine specific initialisation */
262 if (likely(sh_mv.mv_setup))
263 sh_mv.mv_setup(cmdline_p);
267 static const char *cpu_name[] = {
268 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
269 [CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300",
270 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
271 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
272 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
273 [CPU_SH7712] = "SH7712",
274 [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750",
275 [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R",
276 [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R",
277 [CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180",
278 [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1",
279 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
280 [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780",
281 [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343",
282 [CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722",
283 [CPU_SH_NONE] = "Unknown"
286 const char *get_cpu_subtype(struct sh_cpuinfo *c)
288 return cpu_name[c->type];
291 #ifdef CONFIG_PROC_FS
292 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
293 static const char *cpu_flags[] = {
294 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
295 "ptea", "llsc", "l2", "op32", NULL
298 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
302 seq_printf(m, "cpu flags\t:");
305 seq_printf(m, " %s\n", cpu_flags[0]);
309 for (i = 0; cpu_flags[i]; i++)
310 if ((c->flags & (1 << i)))
311 seq_printf(m, " %s", cpu_flags[i+1]);
316 static void show_cacheinfo(struct seq_file *m, const char *type,
317 struct cache_info info)
319 unsigned int cache_size;
321 cache_size = info.ways * info.sets * info.linesz;
323 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
324 type, cache_size >> 10, info.ways);
328 * Get CPU information for use by the procfs.
330 static int show_cpuinfo(struct seq_file *m, void *v)
332 struct sh_cpuinfo *c = v;
333 unsigned int cpu = c - cpu_data;
335 if (!cpu_online(cpu))
339 seq_printf(m, "machine\t\t: %s\n", get_system_type());
341 seq_printf(m, "processor\t: %d\n", cpu);
342 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
343 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
347 seq_printf(m, "cache type\t: ");
350 * Check for what type of cache we have, we support both the
351 * unified cache on the SH-2 and SH-3, as well as the harvard
352 * style cache on the SH-4.
354 if (c->icache.flags & SH_CACHE_COMBINED) {
355 seq_printf(m, "unified\n");
356 show_cacheinfo(m, "cache", c->icache);
358 seq_printf(m, "split (harvard)\n");
359 show_cacheinfo(m, "icache", c->icache);
360 show_cacheinfo(m, "dcache", c->dcache);
363 /* Optional secondary cache */
364 if (c->flags & CPU_HAS_L2_CACHE)
365 show_cacheinfo(m, "scache", c->scache);
367 seq_printf(m, "bogomips\t: %lu.%02lu\n",
368 c->loops_per_jiffy/(500000/HZ),
369 (c->loops_per_jiffy/(5000/HZ)) % 100);
374 static void *c_start(struct seq_file *m, loff_t *pos)
376 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
378 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
381 return c_start(m, pos);
383 static void c_stop(struct seq_file *m, void *v)
386 struct seq_operations cpuinfo_op = {
390 .show = show_cpuinfo,
392 #endif /* CONFIG_PROC_FS */