2 * arch/xtensa/kernel/setup.c
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 1995 Linus Torvalds
9 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 * Chris Zankel <chris@zankel.net>
12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
14 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
17 #include <linux/errno.h>
18 #include <linux/init.h>
20 #include <linux/proc_fs.h>
21 #include <linux/screen_info.h>
22 #include <linux/bootmem.h>
23 #include <linux/kernel.h>
25 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
26 # include <linux/console.h>
30 # include <linux/timex.h>
34 # include <linux/seq_file.h>
37 #include <asm/bootparam.h>
38 #include <asm/pgtable.h>
39 #include <asm/processor.h>
40 #include <asm/timex.h>
41 #include <asm/platform.h>
43 #include <asm/setup.h>
44 #include <asm/param.h>
46 #include <platform/hardware.h>
48 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
49 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
52 #ifdef CONFIG_BLK_DEV_FD
53 extern struct fd_ops no_fd_ops;
54 struct fd_ops *fd_ops;
57 extern struct rtc_ops no_rtc_ops;
58 struct rtc_ops *rtc_ops;
60 #ifdef CONFIG_BLK_DEV_INITRD
61 extern void *initrd_start;
62 extern void *initrd_end;
63 extern void *__initrd_start;
64 extern void *__initrd_end;
65 int initrd_is_mapped = 0;
66 extern int initrd_below_start_ok;
69 unsigned char aux_device_present;
70 extern unsigned long loops_per_jiffy;
72 /* Command line specified as configuration option. */
74 static char __initdata command_line[COMMAND_LINE_SIZE];
76 #ifdef CONFIG_CMDLINE_BOOL
77 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
80 sysmem_info_t __initdata sysmem;
82 #ifdef CONFIG_BLK_DEV_INITRD
87 extern void init_mmu(void);
89 static inline void init_mmu(void) { }
92 extern void zones_init(void);
95 * Boot parameter parsing.
97 * The Xtensa port uses a list of variable-sized tags to pass data to
98 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
99 * to be recognised. The list is terminated with a zero-sized
103 typedef struct tagtable {
105 int (*parse)(const bp_tag_t*);
108 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
109 __attribute__((unused, __section__(".taglist"))) = { tag, fn }
111 /* parse current tag */
113 static int __init parse_tag_mem(const bp_tag_t *tag)
115 meminfo_t *mi = (meminfo_t*)(tag->data);
117 if (mi->type != MEMORY_TYPE_CONVENTIONAL)
120 if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
122 "Ignoring memory bank 0x%08lx size %ldKB\n",
123 (unsigned long)mi->start,
124 (unsigned long)mi->end - (unsigned long)mi->start);
127 sysmem.bank[sysmem.nr_banks].type = mi->type;
128 sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
129 sysmem.bank[sysmem.nr_banks].end = mi->end & PAGE_SIZE;
135 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
137 #ifdef CONFIG_BLK_DEV_INITRD
139 static int __init parse_tag_initrd(const bp_tag_t* tag)
142 mi = (meminfo_t*)(tag->data);
143 initrd_start = (void*)(mi->start);
144 initrd_end = (void*)(mi->end);
149 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
151 #endif /* CONFIG_BLK_DEV_INITRD */
153 static int __init parse_tag_cmdline(const bp_tag_t* tag)
155 strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
156 command_line[COMMAND_LINE_SIZE - 1] = '\0';
160 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
162 static int __init parse_bootparam(const bp_tag_t* tag)
164 extern tagtable_t __tagtable_begin, __tagtable_end;
167 /* Boot parameters must start with a BP_TAG_FIRST tag. */
169 if (tag->id != BP_TAG_FIRST) {
170 printk(KERN_WARNING "Invalid boot parameters!\n");
174 tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
176 /* Parse all tags. */
178 while (tag != NULL && tag->id != BP_TAG_LAST) {
179 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
180 if (tag->id == t->tag) {
185 if (t == &__tagtable_end)
186 printk(KERN_WARNING "Ignoring tag "
187 "0x%08x\n", tag->id);
188 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
195 * Initialize architecture. (Early stage)
198 void __init init_arch(bp_tag_t *bp_start)
201 #ifdef CONFIG_BLK_DEV_INITRD
202 initrd_start = &__initrd_start;
203 initrd_end = &__initrd_end;
208 #ifdef CONFIG_CMDLINE_BOOL
209 strcpy(command_line, default_command_line);
212 /* Parse boot parameters */
215 parse_bootparam(bp_start);
217 if (sysmem.nr_banks == 0) {
219 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
220 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
221 + PLATFORM_DEFAULT_MEM_SIZE;
224 /* Early hook for platforms */
226 platform_init(bp_start);
228 /* Initialize MMU. */
234 * Initialize system. Setup memory and reserve regions.
239 extern char _WindowVectors_text_start;
240 extern char _WindowVectors_text_end;
241 extern char _DebugInterruptVector_literal_start;
242 extern char _DebugInterruptVector_text_end;
243 extern char _KernelExceptionVector_literal_start;
244 extern char _KernelExceptionVector_text_end;
245 extern char _UserExceptionVector_literal_start;
246 extern char _UserExceptionVector_text_end;
247 extern char _DoubleExceptionVector_literal_start;
248 extern char _DoubleExceptionVector_text_end;
250 void __init setup_arch(char **cmdline_p)
252 extern int mem_reserve(unsigned long, unsigned long, int);
253 extern void bootmem_init(void);
255 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
256 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
257 *cmdline_p = command_line;
259 /* Reserve some memory regions */
261 #ifdef CONFIG_BLK_DEV_INITRD
262 if (initrd_start < initrd_end) {
263 initrd_is_mapped = mem_reserve(__pa(initrd_start),
264 __pa(initrd_end), 0);
265 initrd_below_start_ok = 1;
271 mem_reserve(__pa(&_stext),__pa(&_end), 1);
273 mem_reserve(__pa(&_WindowVectors_text_start),
274 __pa(&_WindowVectors_text_end), 0);
276 mem_reserve(__pa(&_DebugInterruptVector_literal_start),
277 __pa(&_DebugInterruptVector_text_end), 0);
279 mem_reserve(__pa(&_KernelExceptionVector_literal_start),
280 __pa(&_KernelExceptionVector_text_end), 0);
282 mem_reserve(__pa(&_UserExceptionVector_literal_start),
283 __pa(&_UserExceptionVector_text_end), 0);
285 mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
286 __pa(&_DoubleExceptionVector_text_end), 0);
290 platform_setup(cmdline_p);
297 # if defined(CONFIG_VGA_CONSOLE)
298 conswitchp = &vga_con;
299 # elif defined(CONFIG_DUMMY_CONSOLE)
300 conswitchp = &dummy_con;
305 platform_pcibios_init();
309 void machine_restart(char * cmd)
314 void machine_halt(void)
320 void machine_power_off(void)
322 platform_power_off();
325 #ifdef CONFIG_PROC_FS
328 * Display some core information through /proc/cpuinfo.
332 c_show(struct seq_file *f, void *slot)
334 /* high-level stuff */
335 seq_printf(f,"processor\t: 0\n"
336 "vendor_id\t: Tensilica\n"
337 "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
338 "core ID\t\t: " XCHAL_CORE_ID "\n"
341 "cpu MHz\t\t: %lu.%02lu\n"
342 "bogomips\t: %lu.%02lu\n",
343 XCHAL_BUILD_UNIQUE_ID,
344 XCHAL_HAVE_BE ? "big" : "little",
345 CCOUNT_PER_JIFFY/(1000000/HZ),
346 (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
347 loops_per_jiffy/(500000/HZ),
348 (loops_per_jiffy/(5000/HZ)) % 100);
350 seq_printf(f,"flags\t\t: "
360 #if XCHAL_HAVE_DENSITY
363 #if XCHAL_HAVE_BOOLEANS
372 #if XCHAL_HAVE_MINMAX
378 #if XCHAL_HAVE_CLAMPS
390 #if XCHAL_HAVE_MUL32_HIGH
399 seq_printf(f,"physical aregs\t: %d\n"
410 seq_printf(f,"num ints\t: %d\n"
414 "debug level\t: %d\n",
415 XCHAL_NUM_INTERRUPTS,
416 XCHAL_NUM_EXTINTERRUPTS,
422 seq_printf(f,"icache line size: %d\n"
423 "icache ways\t: %d\n"
424 "icache size\t: %d\n"
426 #if XCHAL_ICACHE_LINE_LOCKABLE
430 "dcache line size: %d\n"
431 "dcache ways\t: %d\n"
432 "dcache size\t: %d\n"
434 #if XCHAL_DCACHE_IS_WRITEBACK
437 #if XCHAL_DCACHE_LINE_LOCKABLE
441 XCHAL_ICACHE_LINESIZE,
444 XCHAL_DCACHE_LINESIZE,
452 * We show only CPU #0 info.
455 c_start(struct seq_file *f, loff_t *pos)
457 return (void *) ((*pos == 0) ? (void *)1 : NULL);
461 c_next(struct seq_file *f, void *v, loff_t *pos)
467 c_stop(struct seq_file *f, void *v)
471 const struct seq_operations cpuinfo_op =
479 #endif /* CONFIG_PROC_FS */