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1da177e4 LT |
1 | /* |
2 | * linux/arch/m32r/kernel/smpboot.c | |
3 | * orig : i386 2.4.10 | |
4 | * | |
5 | * M32R SMP booting functions | |
6 | * | |
7 | * Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto | |
8 | * | |
9 | * Taken from i386 version. | |
10 | * (c) 1995 Alan Cox, Building #3 <alan@redhat.com> | |
11 | * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com> | |
12 | * | |
13 | * Much of the core SMP work is based on previous work by Thomas Radke, to | |
14 | * whom a great many thanks are extended. | |
15 | * | |
16 | * Thanks to Intel for making available several different Pentium, | |
17 | * Pentium Pro and Pentium-II/Xeon MP machines. | |
18 | * Original development of Linux SMP code supported by Caldera. | |
19 | * | |
20 | * This code is released under the GNU General Public License version 2 or | |
21 | * later. | |
22 | * | |
23 | * Fixes | |
24 | * Felix Koop : NR_CPUS used properly | |
25 | * Jose Renau : Handle single CPU case. | |
26 | * Alan Cox : By repeated request | |
27 | * 8) - Total BogoMIP report. | |
28 | * Greg Wright : Fix for kernel stacks panic. | |
29 | * Erich Boleyn : MP v1.4 and additional changes. | |
30 | * Matthias Sattler : Changes for 2.1 kernel map. | |
31 | * Michel Lespinasse : Changes for 2.1 kernel map. | |
32 | * Michael Chastain : Change trampoline.S to gnu as. | |
33 | * Alan Cox : Dumb bug: 'B' step PPro's are fine | |
34 | * Ingo Molnar : Added APIC timers, based on code | |
35 | * from Jose Renau | |
36 | * Ingo Molnar : various cleanups and rewrites | |
37 | * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug. | |
38 | * Maciej W. Rozycki : Bits for genuine 82489DX APICs | |
39 | * Martin J. Bligh : Added support for multi-quad systems | |
40 | */ | |
41 | ||
7c1c4e54 | 42 | #include <linux/module.h> |
1da177e4 LT |
43 | #include <linux/config.h> |
44 | #include <linux/init.h> | |
7c1c4e54 | 45 | #include <linux/kernel.h> |
1da177e4 LT |
46 | #include <linux/mm.h> |
47 | #include <linux/smp_lock.h> | |
48 | #include <linux/irq.h> | |
49 | #include <linux/bootmem.h> | |
50 | #include <linux/delay.h> | |
51 | ||
52 | #include <asm/io.h> | |
53 | #include <asm/pgalloc.h> | |
54 | #include <asm/tlbflush.h> | |
55 | ||
56 | #define DEBUG_SMP | |
57 | #ifdef DEBUG_SMP | |
58 | #define Dprintk(x...) printk(x) | |
59 | #else | |
60 | #define Dprintk(x...) | |
61 | #endif | |
62 | ||
63 | extern cpumask_t cpu_initialized; | |
64 | ||
65 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
66 | /* Data structures and variables */ | |
67 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
68 | ||
69 | /* Processor that is doing the boot up */ | |
70 | static unsigned int bsp_phys_id = -1; | |
71 | ||
72 | /* Bitmask of physically existing CPUs */ | |
73 | physid_mask_t phys_cpu_present_map; | |
74 | ||
75 | /* Bitmask of currently online CPUs */ | |
76 | cpumask_t cpu_online_map; | |
7c1c4e54 | 77 | EXPORT_SYMBOL(cpu_online_map); |
1da177e4 LT |
78 | |
79 | cpumask_t cpu_bootout_map; | |
80 | cpumask_t cpu_bootin_map; | |
1da177e4 | 81 | static cpumask_t cpu_callin_map; |
7c1c4e54 HT |
82 | cpumask_t cpu_callout_map; |
83 | EXPORT_SYMBOL(cpu_callout_map); | |
84 | cpumask_t cpu_possible_map = CPU_MASK_ALL; | |
85 | EXPORT_SYMBOL(cpu_possible_map); | |
1da177e4 LT |
86 | |
87 | /* Per CPU bogomips and other parameters */ | |
88 | struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned; | |
89 | ||
90 | static int cpucount; | |
91 | static cpumask_t smp_commenced_mask; | |
92 | ||
93 | extern struct { | |
94 | void * spi; | |
95 | unsigned short ss; | |
96 | } stack_start; | |
97 | ||
98 | /* which physical physical ID maps to which logical CPU number */ | |
99 | static volatile int physid_2_cpu[NR_CPUS]; | |
e231a9c4 | 100 | #define physid_to_cpu(physid) physid_2_cpu[physid] |
1da177e4 LT |
101 | |
102 | /* which logical CPU number maps to which physical ID */ | |
103 | volatile int cpu_2_physid[NR_CPUS]; | |
104 | ||
105 | DEFINE_PER_CPU(int, prof_multiplier) = 1; | |
106 | DEFINE_PER_CPU(int, prof_old_multiplier) = 1; | |
107 | DEFINE_PER_CPU(int, prof_counter) = 1; | |
108 | ||
109 | spinlock_t ipi_lock[NR_IPIS]; | |
110 | ||
111 | static unsigned int calibration_result; | |
112 | ||
113 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
114 | /* Function Prototypes */ | |
115 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
116 | ||
117 | void smp_prepare_boot_cpu(void); | |
118 | void smp_prepare_cpus(unsigned int); | |
1da177e4 LT |
119 | static void init_ipi_lock(void); |
120 | static void do_boot_cpu(int); | |
121 | int __cpu_up(unsigned int); | |
122 | void smp_cpus_done(unsigned int); | |
123 | ||
124 | int start_secondary(void *); | |
125 | static void smp_callin(void); | |
126 | static void smp_online(void); | |
127 | ||
128 | static void show_mp_info(int); | |
129 | static void smp_store_cpu_info(int); | |
130 | static void show_cpu_info(int); | |
131 | int setup_profiling_timer(unsigned int); | |
132 | static void init_cpu_to_physid(void); | |
133 | static void map_cpu_to_physid(int, int); | |
134 | static void unmap_cpu_to_physid(int, int); | |
135 | ||
136 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
137 | /* Boot up APs Routins : BSP */ | |
138 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
139 | void __devinit smp_prepare_boot_cpu(void) | |
140 | { | |
141 | bsp_phys_id = hard_smp_processor_id(); | |
142 | physid_set(bsp_phys_id, phys_cpu_present_map); | |
143 | cpu_set(0, cpu_online_map); /* BSP's cpu_id == 0 */ | |
144 | cpu_set(0, cpu_callout_map); | |
145 | cpu_set(0, cpu_callin_map); | |
146 | ||
147 | /* | |
148 | * Initialize the logical to physical CPU number mapping | |
149 | */ | |
150 | init_cpu_to_physid(); | |
151 | map_cpu_to_physid(0, bsp_phys_id); | |
152 | current_thread_info()->cpu = 0; | |
153 | } | |
154 | ||
155 | /*==========================================================================* | |
156 | * Name: smp_prepare_cpus (old smp_boot_cpus) | |
157 | * | |
158 | * Description: This routine boot up APs. | |
159 | * | |
160 | * Born on Date: 2002.02.05 | |
161 | * | |
162 | * Arguments: NONE | |
163 | * | |
164 | * Returns: void (cannot fail) | |
165 | * | |
166 | * Modification log: | |
167 | * Date Who Description | |
168 | * ---------- --- -------------------------------------------------------- | |
169 | * 2003-06-24 hy modify for linux-2.5.69 | |
170 | * | |
171 | *==========================================================================*/ | |
172 | void __init smp_prepare_cpus(unsigned int max_cpus) | |
173 | { | |
174 | int phys_id; | |
175 | unsigned long nr_cpu; | |
176 | ||
177 | nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL); | |
178 | if (nr_cpu > NR_CPUS) { | |
179 | printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]", | |
180 | nr_cpu, NR_CPUS); | |
181 | goto smp_done; | |
182 | } | |
183 | for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++) | |
184 | physid_set(phys_id, phys_cpu_present_map); | |
7c1c4e54 HT |
185 | #ifndef CONFIG_HOTPLUG_CPU |
186 | cpu_present_map = cpu_possible_map; | |
187 | #endif | |
1da177e4 LT |
188 | |
189 | show_mp_info(nr_cpu); | |
190 | ||
191 | init_ipi_lock(); | |
192 | ||
193 | /* | |
194 | * Setup boot CPU information | |
195 | */ | |
196 | smp_store_cpu_info(0); /* Final full version of the data */ | |
1da177e4 LT |
197 | |
198 | /* | |
199 | * If SMP should be disabled, then really disable it! | |
200 | */ | |
201 | if (!max_cpus) { | |
202 | printk(KERN_INFO "SMP mode deactivated by commandline.\n"); | |
203 | goto smp_done; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Now scan the CPU present map and fire up the other CPUs. | |
208 | */ | |
209 | Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map)); | |
210 | ||
211 | for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) { | |
212 | /* | |
213 | * Don't even attempt to start the boot CPU! | |
214 | */ | |
215 | if (phys_id == bsp_phys_id) | |
216 | continue; | |
217 | ||
218 | if (!physid_isset(phys_id, phys_cpu_present_map)) | |
219 | continue; | |
220 | ||
221 | if ((max_cpus >= 0) && (max_cpus <= cpucount + 1)) | |
222 | continue; | |
223 | ||
224 | do_boot_cpu(phys_id); | |
225 | ||
226 | /* | |
227 | * Make sure we unmap all failed CPUs | |
228 | */ | |
229 | if (physid_to_cpu(phys_id) == -1) { | |
230 | physid_clear(phys_id, phys_cpu_present_map); | |
231 | printk("phys CPU#%d not responding - " \ | |
232 | "cannot use it.\n", phys_id); | |
233 | } | |
234 | } | |
235 | ||
236 | smp_done: | |
237 | Dprintk("Boot done.\n"); | |
238 | } | |
239 | ||
1da177e4 LT |
240 | /* |
241 | * init_ipi_lock : Initialize IPI locks. | |
242 | */ | |
243 | static void __init init_ipi_lock(void) | |
244 | { | |
245 | int ipi; | |
246 | ||
247 | for (ipi = 0 ; ipi < NR_IPIS ; ipi++) | |
248 | spin_lock_init(&ipi_lock[ipi]); | |
249 | } | |
250 | ||
251 | /*==========================================================================* | |
252 | * Name: do_boot_cpu | |
253 | * | |
254 | * Description: This routine boot up one AP. | |
255 | * | |
256 | * Born on Date: 2002.02.05 | |
257 | * | |
258 | * Arguments: phys_id - Target CPU physical ID | |
259 | * | |
260 | * Returns: void (cannot fail) | |
261 | * | |
262 | * Modification log: | |
263 | * Date Who Description | |
264 | * ---------- --- -------------------------------------------------------- | |
265 | * 2003-06-24 hy modify for linux-2.5.69 | |
266 | * | |
267 | *==========================================================================*/ | |
268 | static void __init do_boot_cpu(int phys_id) | |
269 | { | |
270 | struct task_struct *idle; | |
271 | unsigned long send_status, boot_status; | |
272 | int timeout, cpu_id; | |
273 | ||
274 | cpu_id = ++cpucount; | |
275 | ||
276 | /* | |
277 | * We can't use kernel_thread since we must avoid to | |
278 | * reschedule the child. | |
279 | */ | |
280 | idle = fork_idle(cpu_id); | |
281 | if (IS_ERR(idle)) | |
282 | panic("failed fork for CPU#%d.", cpu_id); | |
283 | ||
284 | idle->thread.lr = (unsigned long)start_secondary; | |
285 | ||
286 | map_cpu_to_physid(cpu_id, phys_id); | |
287 | ||
288 | /* So we see what's up */ | |
289 | printk("Booting processor %d/%d\n", phys_id, cpu_id); | |
290 | stack_start.spi = (void *)idle->thread.sp; | |
6c3559fc | 291 | task_thread_info(idle)->cpu = cpu_id; |
1da177e4 LT |
292 | |
293 | /* | |
294 | * Send Startup IPI | |
295 | * 1.IPI received by CPU#(phys_id). | |
296 | * 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S) | |
297 | * 3.CPU#(phys_id) enter start_secondary() | |
298 | */ | |
299 | send_status = 0; | |
300 | boot_status = 0; | |
301 | ||
302 | cpu_set(phys_id, cpu_bootout_map); | |
303 | ||
304 | /* Send Startup IPI */ | |
305 | send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0); | |
306 | ||
307 | Dprintk("Waiting for send to finish...\n"); | |
308 | timeout = 0; | |
309 | ||
310 | /* Wait 100[ms] */ | |
311 | do { | |
312 | Dprintk("+"); | |
313 | udelay(1000); | |
314 | send_status = !cpu_isset(phys_id, cpu_bootin_map); | |
315 | } while (send_status && (timeout++ < 100)); | |
316 | ||
317 | Dprintk("After Startup.\n"); | |
318 | ||
319 | if (!send_status) { | |
320 | /* | |
321 | * allow APs to start initializing. | |
322 | */ | |
323 | Dprintk("Before Callout %d.\n", cpu_id); | |
324 | cpu_set(cpu_id, cpu_callout_map); | |
325 | Dprintk("After Callout %d.\n", cpu_id); | |
326 | ||
327 | /* | |
328 | * Wait 5s total for a response | |
329 | */ | |
330 | for (timeout = 0; timeout < 5000; timeout++) { | |
331 | if (cpu_isset(cpu_id, cpu_callin_map)) | |
332 | break; /* It has booted */ | |
333 | udelay(1000); | |
334 | } | |
335 | ||
336 | if (cpu_isset(cpu_id, cpu_callin_map)) { | |
337 | /* number CPUs logically, starting from 1 (BSP is 0) */ | |
338 | Dprintk("OK.\n"); | |
339 | } else { | |
340 | boot_status = 1; | |
341 | printk("Not responding.\n"); | |
342 | } | |
343 | } else | |
344 | printk("IPI never delivered???\n"); | |
345 | ||
346 | if (send_status || boot_status) { | |
347 | unmap_cpu_to_physid(cpu_id, phys_id); | |
348 | cpu_clear(cpu_id, cpu_callout_map); | |
349 | cpu_clear(cpu_id, cpu_callin_map); | |
350 | cpu_clear(cpu_id, cpu_initialized); | |
351 | cpucount--; | |
352 | } | |
353 | } | |
354 | ||
355 | int __devinit __cpu_up(unsigned int cpu_id) | |
356 | { | |
357 | int timeout; | |
358 | ||
359 | cpu_set(cpu_id, smp_commenced_mask); | |
360 | ||
361 | /* | |
362 | * Wait 5s total for a response | |
363 | */ | |
364 | for (timeout = 0; timeout < 5000; timeout++) { | |
365 | if (cpu_isset(cpu_id, cpu_online_map)) | |
366 | break; | |
367 | udelay(1000); | |
368 | } | |
369 | if (!cpu_isset(cpu_id, cpu_online_map)) | |
370 | BUG(); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | void __init smp_cpus_done(unsigned int max_cpus) | |
376 | { | |
377 | int cpu_id, timeout; | |
378 | unsigned long bogosum = 0; | |
379 | ||
380 | for (timeout = 0; timeout < 5000; timeout++) { | |
381 | if (cpus_equal(cpu_callin_map, cpu_online_map)) | |
382 | break; | |
383 | udelay(1000); | |
384 | } | |
385 | if (!cpus_equal(cpu_callin_map, cpu_online_map)) | |
386 | BUG(); | |
387 | ||
388 | for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++) | |
389 | show_cpu_info(cpu_id); | |
390 | ||
391 | /* | |
392 | * Allow the user to impress friends. | |
393 | */ | |
394 | Dprintk("Before bogomips.\n"); | |
395 | if (cpucount) { | |
396 | for_each_cpu_mask(cpu_id, cpu_online_map) | |
397 | bogosum += cpu_data[cpu_id].loops_per_jiffy; | |
398 | ||
399 | printk(KERN_INFO "Total of %d processors activated " \ | |
400 | "(%lu.%02lu BogoMIPS).\n", cpucount + 1, | |
401 | bogosum / (500000 / HZ), | |
402 | (bogosum / (5000 / HZ)) % 100); | |
403 | Dprintk("Before bogocount - setting activated=1.\n"); | |
404 | } | |
405 | } | |
406 | ||
407 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
408 | /* Activate a secondary processor Routins */ | |
409 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
410 | ||
411 | /*==========================================================================* | |
412 | * Name: start_secondary | |
413 | * | |
414 | * Description: This routine activate a secondary processor. | |
415 | * | |
416 | * Born on Date: 2002.02.05 | |
417 | * | |
418 | * Arguments: *unused - currently unused. | |
419 | * | |
420 | * Returns: void (cannot fail) | |
421 | * | |
422 | * Modification log: | |
423 | * Date Who Description | |
424 | * ---------- --- -------------------------------------------------------- | |
425 | * 2003-06-24 hy modify for linux-2.5.69 | |
426 | * | |
427 | *==========================================================================*/ | |
428 | int __init start_secondary(void *unused) | |
429 | { | |
430 | cpu_init(); | |
5bfb5d69 | 431 | preempt_disable(); |
1da177e4 LT |
432 | smp_callin(); |
433 | while (!cpu_isset(smp_processor_id(), smp_commenced_mask)) | |
434 | cpu_relax(); | |
435 | ||
436 | smp_online(); | |
437 | ||
438 | /* | |
439 | * low-memory mappings have been cleared, flush them from | |
440 | * the local TLBs too. | |
441 | */ | |
442 | local_flush_tlb_all(); | |
443 | ||
444 | cpu_idle(); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | /*==========================================================================* | |
449 | * Name: smp_callin | |
450 | * | |
451 | * Description: This routine activate a secondary processor. | |
452 | * | |
453 | * Born on Date: 2002.02.05 | |
454 | * | |
455 | * Arguments: NONE | |
456 | * | |
457 | * Returns: void (cannot fail) | |
458 | * | |
459 | * Modification log: | |
460 | * Date Who Description | |
461 | * ---------- --- -------------------------------------------------------- | |
462 | * 2003-06-24 hy modify for linux-2.5.69 | |
463 | * | |
464 | *==========================================================================*/ | |
465 | static void __init smp_callin(void) | |
466 | { | |
467 | int phys_id = hard_smp_processor_id(); | |
468 | int cpu_id = smp_processor_id(); | |
469 | unsigned long timeout; | |
470 | ||
471 | if (cpu_isset(cpu_id, cpu_callin_map)) { | |
472 | printk("huh, phys CPU#%d, CPU#%d already present??\n", | |
473 | phys_id, cpu_id); | |
474 | BUG(); | |
475 | } | |
476 | Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id); | |
477 | ||
478 | /* Waiting 2s total for startup (udelay is not yet working) */ | |
479 | timeout = jiffies + (2 * HZ); | |
480 | while (time_before(jiffies, timeout)) { | |
481 | /* Has the boot CPU finished it's STARTUP sequence ? */ | |
482 | if (cpu_isset(cpu_id, cpu_callout_map)) | |
483 | break; | |
484 | cpu_relax(); | |
485 | } | |
486 | ||
487 | if (!time_before(jiffies, timeout)) { | |
488 | printk("BUG: CPU#%d started up but did not get a callout!\n", | |
489 | cpu_id); | |
490 | BUG(); | |
491 | } | |
492 | ||
493 | /* Allow the master to continue. */ | |
494 | cpu_set(cpu_id, cpu_callin_map); | |
495 | } | |
496 | ||
497 | static void __init smp_online(void) | |
498 | { | |
499 | int cpu_id = smp_processor_id(); | |
500 | ||
501 | local_irq_enable(); | |
502 | ||
503 | /* Get our bogomips. */ | |
504 | calibrate_delay(); | |
505 | ||
506 | /* Save our processor parameters */ | |
507 | smp_store_cpu_info(cpu_id); | |
508 | ||
509 | cpu_set(cpu_id, cpu_online_map); | |
510 | } | |
511 | ||
512 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
513 | /* Boot up CPUs common Routins */ | |
514 | /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ | |
515 | static void __init show_mp_info(int nr_cpu) | |
516 | { | |
517 | int i; | |
518 | char cpu_model0[17], cpu_model1[17], cpu_ver[9]; | |
519 | ||
520 | strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16); | |
521 | strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16); | |
522 | strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8); | |
523 | ||
524 | cpu_model0[16] = '\0'; | |
525 | for (i = 15 ; i >= 0 ; i--) { | |
526 | if (cpu_model0[i] != ' ') | |
527 | break; | |
528 | cpu_model0[i] = '\0'; | |
529 | } | |
530 | cpu_model1[16] = '\0'; | |
531 | for (i = 15 ; i >= 0 ; i--) { | |
532 | if (cpu_model1[i] != ' ') | |
533 | break; | |
534 | cpu_model1[i] = '\0'; | |
535 | } | |
536 | cpu_ver[8] = '\0'; | |
537 | for (i = 7 ; i >= 0 ; i--) { | |
538 | if (cpu_ver[i] != ' ') | |
539 | break; | |
540 | cpu_ver[i] = '\0'; | |
541 | } | |
542 | ||
543 | printk(KERN_INFO "M32R-mp information\n"); | |
544 | printk(KERN_INFO " On-chip CPUs : %d\n", nr_cpu); | |
545 | printk(KERN_INFO " CPU model : %s/%s(%s)\n", cpu_model0, | |
546 | cpu_model1, cpu_ver); | |
547 | } | |
548 | ||
549 | /* | |
550 | * The bootstrap kernel entry code has set these up. Save them for | |
551 | * a given CPU | |
552 | */ | |
553 | static void __init smp_store_cpu_info(int cpu_id) | |
554 | { | |
555 | struct cpuinfo_m32r *ci = cpu_data + cpu_id; | |
556 | ||
557 | *ci = boot_cpu_data; | |
558 | ci->loops_per_jiffy = loops_per_jiffy; | |
559 | } | |
560 | ||
561 | static void __init show_cpu_info(int cpu_id) | |
562 | { | |
563 | struct cpuinfo_m32r *ci = &cpu_data[cpu_id]; | |
564 | ||
565 | printk("CPU#%d : ", cpu_id); | |
566 | ||
567 | #define PRINT_CLOCK(name, value) \ | |
568 | printk(name " clock %d.%02dMHz", \ | |
569 | ((value) / 1000000), ((value) % 1000000) / 10000) | |
570 | ||
571 | PRINT_CLOCK("CPU", (int)ci->cpu_clock); | |
572 | PRINT_CLOCK(", Bus", (int)ci->bus_clock); | |
573 | printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy); | |
574 | } | |
575 | ||
576 | /* | |
577 | * the frequency of the profiling timer can be changed | |
578 | * by writing a multiplier value into /proc/profile. | |
579 | */ | |
580 | int setup_profiling_timer(unsigned int multiplier) | |
581 | { | |
582 | int i; | |
583 | ||
584 | /* | |
585 | * Sanity check. [at least 500 APIC cycles should be | |
586 | * between APIC interrupts as a rule of thumb, to avoid | |
587 | * irqs flooding us] | |
588 | */ | |
589 | if ( (!multiplier) || (calibration_result / multiplier < 500)) | |
590 | return -EINVAL; | |
591 | ||
592 | /* | |
593 | * Set the new multiplier for each CPU. CPUs don't start using the | |
594 | * new values until the next timer interrupt in which they do process | |
595 | * accounting. At that time they also adjust their APIC timers | |
596 | * accordingly. | |
597 | */ | |
598 | for (i = 0; i < NR_CPUS; ++i) | |
599 | per_cpu(prof_multiplier, i) = multiplier; | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | /* Initialize all maps between cpu number and apicids */ | |
605 | static void __init init_cpu_to_physid(void) | |
606 | { | |
607 | int i; | |
608 | ||
609 | for (i = 0 ; i < NR_CPUS ; i++) { | |
610 | cpu_2_physid[i] = -1; | |
611 | physid_2_cpu[i] = -1; | |
612 | } | |
613 | } | |
614 | ||
615 | /* | |
616 | * set up a mapping between cpu and apicid. Uses logical apicids for multiquad, | |
617 | * else physical apic ids | |
618 | */ | |
619 | static void __init map_cpu_to_physid(int cpu_id, int phys_id) | |
620 | { | |
621 | physid_2_cpu[phys_id] = cpu_id; | |
622 | cpu_2_physid[cpu_id] = phys_id; | |
623 | } | |
624 | ||
625 | /* | |
626 | * undo a mapping between cpu and apicid. Uses logical apicids for multiquad, | |
627 | * else physical apic ids | |
628 | */ | |
629 | static void __init unmap_cpu_to_physid(int cpu_id, int phys_id) | |
630 | { | |
631 | physid_2_cpu[phys_id] = -1; | |
632 | cpu_2_physid[cpu_id] = -1; | |
633 | } |