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