tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * arch/xtensa/kernel/setup.c
3 *
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
6 * for more details.
7 *
8 * Copyright (C) 1995 Linus Torvalds
9 * Copyright (C) 2001 - 2005 Tensilica Inc.
10 *
11 * Chris Zankel <chris@zankel.net>
12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
13 * Kevin Chea
14 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
15 */
16
17#include <linux/errno.h>
18#include <linux/init.h>
19#include <linux/mm.h>
20#include <linux/proc_fs.h>
21#include <linux/screen_info.h>
22#include <linux/bootmem.h>
23#include <linux/kernel.h>
24
25#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
26# include <linux/console.h>
27#endif
28
29#ifdef CONFIG_RTC
30# include <linux/timex.h>
31#endif
32
33#ifdef CONFIG_PROC_FS
34# include <linux/seq_file.h>
35#endif
36
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>
42#include <asm/page.h>
43#include <asm/setup.h>
44#include <asm/param.h>
45
46#include <platform/hardware.h>
47
48#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
49struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
50#endif
51
52#ifdef CONFIG_BLK_DEV_FD
53extern struct fd_ops no_fd_ops;
54struct fd_ops *fd_ops;
55#endif
56
57extern struct rtc_ops no_rtc_ops;
58struct rtc_ops *rtc_ops;
59
60#ifdef CONFIG_BLK_DEV_INITRD
61extern void *initrd_start;
62extern void *initrd_end;
63extern void *__initrd_start;
64extern void *__initrd_end;
65int initrd_is_mapped = 0;
66extern int initrd_below_start_ok;
67#endif
68
69unsigned char aux_device_present;
70extern unsigned long loops_per_jiffy;
71
72/* Command line specified as configuration option. */
73
74static char __initdata command_line[COMMAND_LINE_SIZE];
75
76#ifdef CONFIG_CMDLINE_BOOL
77static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
78#endif
79
80sysmem_info_t __initdata sysmem;
81
82#ifdef CONFIG_BLK_DEV_INITRD
83int initrd_is_mapped;
84#endif
85
86#ifdef CONFIG_MMU
87extern void init_mmu(void);
88#else
89static inline void init_mmu(void) { }
90#endif
91
92extern void zones_init(void);
93
94/*
95 * Boot parameter parsing.
96 *
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
100 * BP_TAG_LAST tag.
101 */
102
103typedef struct tagtable {
104 u32 tag;
105 int (*parse)(const bp_tag_t*);
106} tagtable_t;
107
108#define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
109 __attribute__((unused, __section__(".taglist"))) = { tag, fn }
110
111/* parse current tag */
112
113static int __init parse_tag_mem(const bp_tag_t *tag)
114{
115 meminfo_t *mi = (meminfo_t*)(tag->data);
116
117 if (mi->type != MEMORY_TYPE_CONVENTIONAL)
118 return -1;
119
120 if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
121 printk(KERN_WARNING
122 "Ignoring memory bank 0x%08lx size %ldKB\n",
123 (unsigned long)mi->start,
124 (unsigned long)mi->end - (unsigned long)mi->start);
125 return -EINVAL;
126 }
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;
130 sysmem.nr_banks++;
131
132 return 0;
133}
134
135__tagtable(BP_TAG_MEMORY, parse_tag_mem);
136
137#ifdef CONFIG_BLK_DEV_INITRD
138
139static int __init parse_tag_initrd(const bp_tag_t* tag)
140{
141 meminfo_t* mi;
142 mi = (meminfo_t*)(tag->data);
143 initrd_start = (void*)(mi->start);
144 initrd_end = (void*)(mi->end);
145
146 return 0;
147}
148
149__tagtable(BP_TAG_INITRD, parse_tag_initrd);
150
151#endif /* CONFIG_BLK_DEV_INITRD */
152
153static int __init parse_tag_cmdline(const bp_tag_t* tag)
154{
155 strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
156 command_line[COMMAND_LINE_SIZE - 1] = '\0';
157 return 0;
158}
159
160__tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
161
162static int __init parse_bootparam(const bp_tag_t* tag)
163{
164 extern tagtable_t __tagtable_begin, __tagtable_end;
165 tagtable_t *t;
166
167 /* Boot parameters must start with a BP_TAG_FIRST tag. */
168
169 if (tag->id != BP_TAG_FIRST) {
170 printk(KERN_WARNING "Invalid boot parameters!\n");
171 return 0;
172 }
173
174 tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
175
176 /* Parse all tags. */
177
178 while (tag != NULL && tag->id != BP_TAG_LAST) {
179 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
180 if (tag->id == t->tag) {
181 t->parse(tag);
182 break;
183 }
184 }
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);
189 }
190
191 return 0;
192}
193
194/*
195 * Initialize architecture. (Early stage)
196 */
197
198void __init init_arch(bp_tag_t *bp_start)
199{
200
201#ifdef CONFIG_BLK_DEV_INITRD
202 initrd_start = &__initrd_start;
203 initrd_end = &__initrd_end;
204#endif
205
206 sysmem.nr_banks = 0;
207
208#ifdef CONFIG_CMDLINE_BOOL
209 strcpy(command_line, default_command_line);
210#endif
211
212 /* Parse boot parameters */
213
214 if (bp_start)
215 parse_bootparam(bp_start);
216
217 if (sysmem.nr_banks == 0) {
218 sysmem.nr_banks = 1;
219 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
220 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
221 + PLATFORM_DEFAULT_MEM_SIZE;
222 }
223
224 /* Early hook for platforms */
225
226 platform_init(bp_start);
227
228 /* Initialize MMU. */
229
230 init_mmu();
231}
232
233/*
234 * Initialize system. Setup memory and reserve regions.
235 */
236
237extern char _end;
238extern char _stext;
239extern char _WindowVectors_text_start;
240extern char _WindowVectors_text_end;
241extern char _DebugInterruptVector_literal_start;
242extern char _DebugInterruptVector_text_end;
243extern char _KernelExceptionVector_literal_start;
244extern char _KernelExceptionVector_text_end;
245extern char _UserExceptionVector_literal_start;
246extern char _UserExceptionVector_text_end;
247extern char _DoubleExceptionVector_literal_start;
248extern char _DoubleExceptionVector_text_end;
249
250void __init setup_arch(char **cmdline_p)
251{
252 extern int mem_reserve(unsigned long, unsigned long, int);
253 extern void bootmem_init(void);
254
255 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
256 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
257 *cmdline_p = command_line;
258
259 /* Reserve some memory regions */
260
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;
266 } else {
267 initrd_start = 0;
268 }
269#endif
270
271 mem_reserve(__pa(&_stext),__pa(&_end), 1);
272
273 mem_reserve(__pa(&_WindowVectors_text_start),
274 __pa(&_WindowVectors_text_end), 0);
275
276 mem_reserve(__pa(&_DebugInterruptVector_literal_start),
277 __pa(&_DebugInterruptVector_text_end), 0);
278
279 mem_reserve(__pa(&_KernelExceptionVector_literal_start),
280 __pa(&_KernelExceptionVector_text_end), 0);
281
282 mem_reserve(__pa(&_UserExceptionVector_literal_start),
283 __pa(&_UserExceptionVector_text_end), 0);
284
285 mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
286 __pa(&_DoubleExceptionVector_text_end), 0);
287
288 bootmem_init();
289
290 platform_setup(cmdline_p);
291
292
293 paging_init();
294 zones_init();
295
296#ifdef CONFIG_VT
297# if defined(CONFIG_VGA_CONSOLE)
298 conswitchp = &vga_con;
299# elif defined(CONFIG_DUMMY_CONSOLE)
300 conswitchp = &dummy_con;
301# endif
302#endif
303
304#ifdef CONFIG_PCI
305 platform_pcibios_init();
306#endif
307}
308
309void machine_restart(char * cmd)
310{
311 platform_restart();
312}
313
314void machine_halt(void)
315{
316 platform_halt();
317 while (1);
318}
319
320void machine_power_off(void)
321{
322 platform_power_off();
323 while (1);
324}
325#ifdef CONFIG_PROC_FS
326
327/*
328 * Display some core information through /proc/cpuinfo.
329 */
330
331static int
332c_show(struct seq_file *f, void *slot)
333{
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"
339 "build ID\t: 0x%x\n"
340 "byte order\t: %s\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);
349
350 seq_printf(f,"flags\t\t: "
351#if XCHAL_HAVE_NMI
352 "nmi "
353#endif
354#if XCHAL_HAVE_DEBUG
355 "debug "
356# if XCHAL_HAVE_OCD
357 "ocd "
358# endif
359#endif
360#if XCHAL_HAVE_DENSITY
361 "density "
362#endif
363#if XCHAL_HAVE_BOOLEANS
364 "boolean "
365#endif
366#if XCHAL_HAVE_LOOPS
367 "loop "
368#endif
369#if XCHAL_HAVE_NSA
370 "nsa "
371#endif
372#if XCHAL_HAVE_MINMAX
373 "minmax "
374#endif
375#if XCHAL_HAVE_SEXT
376 "sext "
377#endif
378#if XCHAL_HAVE_CLAMPS
379 "clamps "
380#endif
381#if XCHAL_HAVE_MAC16
382 "mac16 "
383#endif
384#if XCHAL_HAVE_MUL16
385 "mul16 "
386#endif
387#if XCHAL_HAVE_MUL32
388 "mul32 "
389#endif
390#if XCHAL_HAVE_MUL32_HIGH
391 "mul32h "
392#endif
393#if XCHAL_HAVE_FP
394 "fpu "
395#endif
396 "\n");
397
398 /* Registers. */
399 seq_printf(f,"physical aregs\t: %d\n"
400 "misc regs\t: %d\n"
401 "ibreak\t\t: %d\n"
402 "dbreak\t\t: %d\n",
403 XCHAL_NUM_AREGS,
404 XCHAL_NUM_MISC_REGS,
405 XCHAL_NUM_IBREAK,
406 XCHAL_NUM_DBREAK);
407
408
409 /* Interrupt. */
410 seq_printf(f,"num ints\t: %d\n"
411 "ext ints\t: %d\n"
412 "int levels\t: %d\n"
413 "timers\t\t: %d\n"
414 "debug level\t: %d\n",
415 XCHAL_NUM_INTERRUPTS,
416 XCHAL_NUM_EXTINTERRUPTS,
417 XCHAL_NUM_INTLEVELS,
418 XCHAL_NUM_TIMERS,
419 XCHAL_DEBUGLEVEL);
420
421 /* Cache */
422 seq_printf(f,"icache line size: %d\n"
423 "icache ways\t: %d\n"
424 "icache size\t: %d\n"
425 "icache flags\t: "
426#if XCHAL_ICACHE_LINE_LOCKABLE
427 "lock"
428#endif
429 "\n"
430 "dcache line size: %d\n"
431 "dcache ways\t: %d\n"
432 "dcache size\t: %d\n"
433 "dcache flags\t: "
434#if XCHAL_DCACHE_IS_WRITEBACK
435 "writeback"
436#endif
437#if XCHAL_DCACHE_LINE_LOCKABLE
438 "lock"
439#endif
440 "\n",
441 XCHAL_ICACHE_LINESIZE,
442 XCHAL_ICACHE_WAYS,
443 XCHAL_ICACHE_SIZE,
444 XCHAL_DCACHE_LINESIZE,
445 XCHAL_DCACHE_WAYS,
446 XCHAL_DCACHE_SIZE);
447
448 return 0;
449}
450
451/*
452 * We show only CPU #0 info.
453 */
454static void *
455c_start(struct seq_file *f, loff_t *pos)
456{
457 return (void *) ((*pos == 0) ? (void *)1 : NULL);
458}
459
460static void *
461c_next(struct seq_file *f, void *v, loff_t *pos)
462{
463 return NULL;
464}
465
466static void
467c_stop(struct seq_file *f, void *v)
468{
469}
470
471const struct seq_operations cpuinfo_op =
472{
473 start: c_start,
474 next: c_next,
475 stop: c_stop,
476 show: c_show
477};
478
479#endif /* CONFIG_PROC_FS */
480