2 * linux/arch/m32r/kernel/smpboot.c
5 * M32R SMP booting functions
7 * Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto
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>
13 * Much of the core SMP work is based on previous work by Thomas Radke, to
14 * whom a great many thanks are extended.
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.
20 * This code is released under the GNU General Public License version 2 or
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
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
42 #include <linux/module.h>
43 #include <linux/config.h>
44 #include <linux/init.h>
45 #include <linux/kernel.h>
47 #include <linux/smp_lock.h>
48 #include <linux/irq.h>
49 #include <linux/bootmem.h>
50 #include <linux/delay.h>
53 #include <asm/pgalloc.h>
54 #include <asm/tlbflush.h>
58 #define Dprintk(x...) printk(x)
63 extern cpumask_t cpu_initialized;
65 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
66 /* Data structures and variables */
67 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
69 /* Processor that is doing the boot up */
70 static unsigned int bsp_phys_id = -1;
72 /* Bitmask of physically existing CPUs */
73 physid_mask_t phys_cpu_present_map;
75 /* Bitmask of currently online CPUs */
76 cpumask_t cpu_online_map;
77 EXPORT_SYMBOL(cpu_online_map);
79 cpumask_t cpu_bootout_map;
80 cpumask_t cpu_bootin_map;
81 static cpumask_t cpu_callin_map;
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);
87 /* Per CPU bogomips and other parameters */
88 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
91 static cpumask_t smp_commenced_mask;
98 /* which physical physical ID maps to which logical CPU number */
99 static volatile int physid_2_cpu[NR_CPUS];
100 #define physid_to_cpu(physid) physid_2_cpu[physid]
102 /* which logical CPU number maps to which physical ID */
103 volatile int cpu_2_physid[NR_CPUS];
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;
109 spinlock_t ipi_lock[NR_IPIS];
111 static unsigned int calibration_result;
113 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
114 /* Function Prototypes */
115 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
117 void smp_prepare_boot_cpu(void);
118 void smp_prepare_cpus(unsigned int);
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);
124 int start_secondary(void *);
125 static void smp_callin(void);
126 static void smp_online(void);
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);
136 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
137 /* Boot up APs Routins : BSP */
138 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
139 void __devinit smp_prepare_boot_cpu(void)
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);
148 * Initialize the logical to physical CPU number mapping
150 init_cpu_to_physid();
151 map_cpu_to_physid(0, bsp_phys_id);
152 current_thread_info()->cpu = 0;
155 /*==========================================================================*
156 * Name: smp_prepare_cpus (old smp_boot_cpus)
158 * Description: This routine boot up APs.
160 * Born on Date: 2002.02.05
164 * Returns: void (cannot fail)
167 * Date Who Description
168 * ---------- --- --------------------------------------------------------
169 * 2003-06-24 hy modify for linux-2.5.69
171 *==========================================================================*/
172 void __init smp_prepare_cpus(unsigned int max_cpus)
175 unsigned long nr_cpu;
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]",
183 for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
184 physid_set(phys_id, phys_cpu_present_map);
185 #ifndef CONFIG_HOTPLUG_CPU
186 cpu_present_map = cpu_possible_map;
189 show_mp_info(nr_cpu);
194 * Setup boot CPU information
196 smp_store_cpu_info(0); /* Final full version of the data */
199 * If SMP should be disabled, then really disable it!
202 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
207 * Now scan the CPU present map and fire up the other CPUs.
209 Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
211 for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
213 * Don't even attempt to start the boot CPU!
215 if (phys_id == bsp_phys_id)
218 if (!physid_isset(phys_id, phys_cpu_present_map))
221 if ((max_cpus >= 0) && (max_cpus <= cpucount + 1))
224 do_boot_cpu(phys_id);
227 * Make sure we unmap all failed CPUs
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);
237 Dprintk("Boot done.\n");
241 * init_ipi_lock : Initialize IPI locks.
243 static void __init init_ipi_lock(void)
247 for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
248 spin_lock_init(&ipi_lock[ipi]);
251 /*==========================================================================*
254 * Description: This routine boot up one AP.
256 * Born on Date: 2002.02.05
258 * Arguments: phys_id - Target CPU physical ID
260 * Returns: void (cannot fail)
263 * Date Who Description
264 * ---------- --- --------------------------------------------------------
265 * 2003-06-24 hy modify for linux-2.5.69
267 *==========================================================================*/
268 static void __init do_boot_cpu(int phys_id)
270 struct task_struct *idle;
271 unsigned long send_status, boot_status;
277 * We can't use kernel_thread since we must avoid to
278 * reschedule the child.
280 idle = fork_idle(cpu_id);
282 panic("failed fork for CPU#%d.", cpu_id);
284 idle->thread.lr = (unsigned long)start_secondary;
286 map_cpu_to_physid(cpu_id, phys_id);
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;
291 task_thread_info(idle)->cpu = cpu_id;
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()
302 cpu_set(phys_id, cpu_bootout_map);
304 /* Send Startup IPI */
305 send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0);
307 Dprintk("Waiting for send to finish...\n");
314 send_status = !cpu_isset(phys_id, cpu_bootin_map);
315 } while (send_status && (timeout++ < 100));
317 Dprintk("After Startup.\n");
321 * allow APs to start initializing.
323 Dprintk("Before Callout %d.\n", cpu_id);
324 cpu_set(cpu_id, cpu_callout_map);
325 Dprintk("After Callout %d.\n", cpu_id);
328 * Wait 5s total for a response
330 for (timeout = 0; timeout < 5000; timeout++) {
331 if (cpu_isset(cpu_id, cpu_callin_map))
332 break; /* It has booted */
336 if (cpu_isset(cpu_id, cpu_callin_map)) {
337 /* number CPUs logically, starting from 1 (BSP is 0) */
341 printk("Not responding.\n");
344 printk("IPI never delivered???\n");
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);
355 int __devinit __cpu_up(unsigned int cpu_id)
359 cpu_set(cpu_id, smp_commenced_mask);
362 * Wait 5s total for a response
364 for (timeout = 0; timeout < 5000; timeout++) {
365 if (cpu_isset(cpu_id, cpu_online_map))
369 if (!cpu_isset(cpu_id, cpu_online_map))
375 void __init smp_cpus_done(unsigned int max_cpus)
378 unsigned long bogosum = 0;
380 for (timeout = 0; timeout < 5000; timeout++) {
381 if (cpus_equal(cpu_callin_map, cpu_online_map))
385 if (!cpus_equal(cpu_callin_map, cpu_online_map))
388 for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
389 show_cpu_info(cpu_id);
392 * Allow the user to impress friends.
394 Dprintk("Before bogomips.\n");
396 for_each_cpu_mask(cpu_id, cpu_online_map)
397 bogosum += cpu_data[cpu_id].loops_per_jiffy;
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");
407 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
408 /* Activate a secondary processor Routins */
409 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
411 /*==========================================================================*
412 * Name: start_secondary
414 * Description: This routine activate a secondary processor.
416 * Born on Date: 2002.02.05
418 * Arguments: *unused - currently unused.
420 * Returns: void (cannot fail)
423 * Date Who Description
424 * ---------- --- --------------------------------------------------------
425 * 2003-06-24 hy modify for linux-2.5.69
427 *==========================================================================*/
428 int __init start_secondary(void *unused)
433 while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
439 * low-memory mappings have been cleared, flush them from
440 * the local TLBs too.
442 local_flush_tlb_all();
448 /*==========================================================================*
451 * Description: This routine activate a secondary processor.
453 * Born on Date: 2002.02.05
457 * Returns: void (cannot fail)
460 * Date Who Description
461 * ---------- --- --------------------------------------------------------
462 * 2003-06-24 hy modify for linux-2.5.69
464 *==========================================================================*/
465 static void __init smp_callin(void)
467 int phys_id = hard_smp_processor_id();
468 int cpu_id = smp_processor_id();
469 unsigned long timeout;
471 if (cpu_isset(cpu_id, cpu_callin_map)) {
472 printk("huh, phys CPU#%d, CPU#%d already present??\n",
476 Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
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))
487 if (!time_before(jiffies, timeout)) {
488 printk("BUG: CPU#%d started up but did not get a callout!\n",
493 /* Allow the master to continue. */
494 cpu_set(cpu_id, cpu_callin_map);
497 static void __init smp_online(void)
499 int cpu_id = smp_processor_id();
503 /* Get our bogomips. */
506 /* Save our processor parameters */
507 smp_store_cpu_info(cpu_id);
509 cpu_set(cpu_id, cpu_online_map);
512 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
513 /* Boot up CPUs common Routins */
514 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
515 static void __init show_mp_info(int nr_cpu)
518 char cpu_model0[17], cpu_model1[17], cpu_ver[9];
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);
524 cpu_model0[16] = '\0';
525 for (i = 15 ; i >= 0 ; i--) {
526 if (cpu_model0[i] != ' ')
528 cpu_model0[i] = '\0';
530 cpu_model1[16] = '\0';
531 for (i = 15 ; i >= 0 ; i--) {
532 if (cpu_model1[i] != ' ')
534 cpu_model1[i] = '\0';
537 for (i = 7 ; i >= 0 ; i--) {
538 if (cpu_ver[i] != ' ')
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);
550 * The bootstrap kernel entry code has set these up. Save them for
553 static void __init smp_store_cpu_info(int cpu_id)
555 struct cpuinfo_m32r *ci = cpu_data + cpu_id;
558 ci->loops_per_jiffy = loops_per_jiffy;
561 static void __init show_cpu_info(int cpu_id)
563 struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
565 printk("CPU#%d : ", cpu_id);
567 #define PRINT_CLOCK(name, value) \
568 printk(name " clock %d.%02dMHz", \
569 ((value) / 1000000), ((value) % 1000000) / 10000)
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);
577 * the frequency of the profiling timer can be changed
578 * by writing a multiplier value into /proc/profile.
580 int setup_profiling_timer(unsigned int multiplier)
585 * Sanity check. [at least 500 APIC cycles should be
586 * between APIC interrupts as a rule of thumb, to avoid
589 if ( (!multiplier) || (calibration_result / multiplier < 500))
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
598 for (i = 0; i < NR_CPUS; ++i)
599 per_cpu(prof_multiplier, i) = multiplier;
604 /* Initialize all maps between cpu number and apicids */
605 static void __init init_cpu_to_physid(void)
609 for (i = 0 ; i < NR_CPUS ; i++) {
610 cpu_2_physid[i] = -1;
611 physid_2_cpu[i] = -1;
616 * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
617 * else physical apic ids
619 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
621 physid_2_cpu[phys_id] = cpu_id;
622 cpu_2_physid[cpu_id] = phys_id;
626 * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
627 * else physical apic ids
629 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
631 physid_2_cpu[phys_id] = -1;
632 cpu_2_physid[cpu_id] = -1;