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/init.h>
44 #include <linux/kernel.h>
46 #include <linux/smp_lock.h>
47 #include <linux/irq.h>
48 #include <linux/bootmem.h>
49 #include <linux/delay.h>
52 #include <asm/pgalloc.h>
53 #include <asm/tlbflush.h>
57 #define Dprintk(x...) printk(x)
62 extern cpumask_t cpu_initialized;
64 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
65 /* Data structures and variables */
66 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
68 /* Processor that is doing the boot up */
69 static unsigned int bsp_phys_id = -1;
71 /* Bitmask of physically existing CPUs */
72 physid_mask_t phys_cpu_present_map;
74 /* Bitmask of currently online CPUs */
75 cpumask_t cpu_online_map;
76 EXPORT_SYMBOL(cpu_online_map);
78 cpumask_t cpu_bootout_map;
79 cpumask_t cpu_bootin_map;
80 static cpumask_t cpu_callin_map;
81 cpumask_t cpu_callout_map;
82 EXPORT_SYMBOL(cpu_callout_map);
83 cpumask_t cpu_possible_map = CPU_MASK_ALL;
84 EXPORT_SYMBOL(cpu_possible_map);
86 /* Per CPU bogomips and other parameters */
87 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
90 static cpumask_t smp_commenced_mask;
97 /* which physical physical ID maps to which logical CPU number */
98 static volatile int physid_2_cpu[NR_CPUS];
99 #define physid_to_cpu(physid) physid_2_cpu[physid]
101 /* which logical CPU number maps to which physical ID */
102 volatile int cpu_2_physid[NR_CPUS];
104 DEFINE_PER_CPU(int, prof_multiplier) = 1;
105 DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
106 DEFINE_PER_CPU(int, prof_counter) = 1;
108 spinlock_t ipi_lock[NR_IPIS];
110 static unsigned int calibration_result;
112 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
113 /* Function Prototypes */
114 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
116 void smp_prepare_boot_cpu(void);
117 void smp_prepare_cpus(unsigned int);
118 static void init_ipi_lock(void);
119 static void do_boot_cpu(int);
120 int __cpu_up(unsigned int);
121 void smp_cpus_done(unsigned int);
123 int start_secondary(void *);
124 static void smp_callin(void);
125 static void smp_online(void);
127 static void show_mp_info(int);
128 static void smp_store_cpu_info(int);
129 static void show_cpu_info(int);
130 int setup_profiling_timer(unsigned int);
131 static void init_cpu_to_physid(void);
132 static void map_cpu_to_physid(int, int);
133 static void unmap_cpu_to_physid(int, int);
135 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
136 /* Boot up APs Routins : BSP */
137 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
138 void __devinit smp_prepare_boot_cpu(void)
140 bsp_phys_id = hard_smp_processor_id();
141 physid_set(bsp_phys_id, phys_cpu_present_map);
142 cpu_set(0, cpu_online_map); /* BSP's cpu_id == 0 */
143 cpu_set(0, cpu_callout_map);
144 cpu_set(0, cpu_callin_map);
147 * Initialize the logical to physical CPU number mapping
149 init_cpu_to_physid();
150 map_cpu_to_physid(0, bsp_phys_id);
151 current_thread_info()->cpu = 0;
154 /*==========================================================================*
155 * Name: smp_prepare_cpus (old smp_boot_cpus)
157 * Description: This routine boot up APs.
159 * Born on Date: 2002.02.05
163 * Returns: void (cannot fail)
166 * Date Who Description
167 * ---------- --- --------------------------------------------------------
168 * 2003-06-24 hy modify for linux-2.5.69
170 *==========================================================================*/
171 void __init smp_prepare_cpus(unsigned int max_cpus)
174 unsigned long nr_cpu;
176 nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
177 if (nr_cpu > NR_CPUS) {
178 printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
182 for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
183 physid_set(phys_id, phys_cpu_present_map);
184 #ifndef CONFIG_HOTPLUG_CPU
185 cpu_present_map = cpu_possible_map;
188 show_mp_info(nr_cpu);
193 * Setup boot CPU information
195 smp_store_cpu_info(0); /* Final full version of the data */
198 * If SMP should be disabled, then really disable it!
201 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
206 * Now scan the CPU present map and fire up the other CPUs.
208 Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
210 for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
212 * Don't even attempt to start the boot CPU!
214 if (phys_id == bsp_phys_id)
217 if (!physid_isset(phys_id, phys_cpu_present_map))
220 if ((max_cpus >= 0) && (max_cpus <= cpucount + 1))
223 do_boot_cpu(phys_id);
226 * Make sure we unmap all failed CPUs
228 if (physid_to_cpu(phys_id) == -1) {
229 physid_clear(phys_id, phys_cpu_present_map);
230 printk("phys CPU#%d not responding - " \
231 "cannot use it.\n", phys_id);
236 Dprintk("Boot done.\n");
240 * init_ipi_lock : Initialize IPI locks.
242 static void __init init_ipi_lock(void)
246 for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
247 spin_lock_init(&ipi_lock[ipi]);
250 /*==========================================================================*
253 * Description: This routine boot up one AP.
255 * Born on Date: 2002.02.05
257 * Arguments: phys_id - Target CPU physical ID
259 * Returns: void (cannot fail)
262 * Date Who Description
263 * ---------- --- --------------------------------------------------------
264 * 2003-06-24 hy modify for linux-2.5.69
266 *==========================================================================*/
267 static void __init do_boot_cpu(int phys_id)
269 struct task_struct *idle;
270 unsigned long send_status, boot_status;
276 * We can't use kernel_thread since we must avoid to
277 * reschedule the child.
279 idle = fork_idle(cpu_id);
281 panic("failed fork for CPU#%d.", cpu_id);
283 idle->thread.lr = (unsigned long)start_secondary;
285 map_cpu_to_physid(cpu_id, phys_id);
287 /* So we see what's up */
288 printk("Booting processor %d/%d\n", phys_id, cpu_id);
289 stack_start.spi = (void *)idle->thread.sp;
290 task_thread_info(idle)->cpu = cpu_id;
294 * 1.IPI received by CPU#(phys_id).
295 * 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
296 * 3.CPU#(phys_id) enter start_secondary()
301 cpu_set(phys_id, cpu_bootout_map);
303 /* Send Startup IPI */
304 send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0);
306 Dprintk("Waiting for send to finish...\n");
313 send_status = !cpu_isset(phys_id, cpu_bootin_map);
314 } while (send_status && (timeout++ < 100));
316 Dprintk("After Startup.\n");
320 * allow APs to start initializing.
322 Dprintk("Before Callout %d.\n", cpu_id);
323 cpu_set(cpu_id, cpu_callout_map);
324 Dprintk("After Callout %d.\n", cpu_id);
327 * Wait 5s total for a response
329 for (timeout = 0; timeout < 5000; timeout++) {
330 if (cpu_isset(cpu_id, cpu_callin_map))
331 break; /* It has booted */
335 if (cpu_isset(cpu_id, cpu_callin_map)) {
336 /* number CPUs logically, starting from 1 (BSP is 0) */
340 printk("Not responding.\n");
343 printk("IPI never delivered???\n");
345 if (send_status || boot_status) {
346 unmap_cpu_to_physid(cpu_id, phys_id);
347 cpu_clear(cpu_id, cpu_callout_map);
348 cpu_clear(cpu_id, cpu_callin_map);
349 cpu_clear(cpu_id, cpu_initialized);
354 int __cpuinit __cpu_up(unsigned int cpu_id)
358 cpu_set(cpu_id, smp_commenced_mask);
361 * Wait 5s total for a response
363 for (timeout = 0; timeout < 5000; timeout++) {
364 if (cpu_isset(cpu_id, cpu_online_map))
368 if (!cpu_isset(cpu_id, cpu_online_map))
374 void __init smp_cpus_done(unsigned int max_cpus)
377 unsigned long bogosum = 0;
379 for (timeout = 0; timeout < 5000; timeout++) {
380 if (cpus_equal(cpu_callin_map, cpu_online_map))
384 if (!cpus_equal(cpu_callin_map, cpu_online_map))
387 for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
388 show_cpu_info(cpu_id);
391 * Allow the user to impress friends.
393 Dprintk("Before bogomips.\n");
395 for_each_cpu_mask(cpu_id, cpu_online_map)
396 bogosum += cpu_data[cpu_id].loops_per_jiffy;
398 printk(KERN_INFO "Total of %d processors activated " \
399 "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
400 bogosum / (500000 / HZ),
401 (bogosum / (5000 / HZ)) % 100);
402 Dprintk("Before bogocount - setting activated=1.\n");
406 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
407 /* Activate a secondary processor Routins */
408 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
410 /*==========================================================================*
411 * Name: start_secondary
413 * Description: This routine activate a secondary processor.
415 * Born on Date: 2002.02.05
417 * Arguments: *unused - currently unused.
419 * Returns: void (cannot fail)
422 * Date Who Description
423 * ---------- --- --------------------------------------------------------
424 * 2003-06-24 hy modify for linux-2.5.69
426 *==========================================================================*/
427 int __init start_secondary(void *unused)
432 while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
438 * low-memory mappings have been cleared, flush them from
439 * the local TLBs too.
441 local_flush_tlb_all();
447 /*==========================================================================*
450 * Description: This routine activate a secondary processor.
452 * Born on Date: 2002.02.05
456 * Returns: void (cannot fail)
459 * Date Who Description
460 * ---------- --- --------------------------------------------------------
461 * 2003-06-24 hy modify for linux-2.5.69
463 *==========================================================================*/
464 static void __init smp_callin(void)
466 int phys_id = hard_smp_processor_id();
467 int cpu_id = smp_processor_id();
468 unsigned long timeout;
470 if (cpu_isset(cpu_id, cpu_callin_map)) {
471 printk("huh, phys CPU#%d, CPU#%d already present??\n",
475 Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
477 /* Waiting 2s total for startup (udelay is not yet working) */
478 timeout = jiffies + (2 * HZ);
479 while (time_before(jiffies, timeout)) {
480 /* Has the boot CPU finished it's STARTUP sequence ? */
481 if (cpu_isset(cpu_id, cpu_callout_map))
486 if (!time_before(jiffies, timeout)) {
487 printk("BUG: CPU#%d started up but did not get a callout!\n",
492 /* Allow the master to continue. */
493 cpu_set(cpu_id, cpu_callin_map);
496 static void __init smp_online(void)
498 int cpu_id = smp_processor_id();
502 /* Get our bogomips. */
505 /* Save our processor parameters */
506 smp_store_cpu_info(cpu_id);
508 cpu_set(cpu_id, cpu_online_map);
511 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
512 /* Boot up CPUs common Routins */
513 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
514 static void __init show_mp_info(int nr_cpu)
517 char cpu_model0[17], cpu_model1[17], cpu_ver[9];
519 strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
520 strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
521 strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
523 cpu_model0[16] = '\0';
524 for (i = 15 ; i >= 0 ; i--) {
525 if (cpu_model0[i] != ' ')
527 cpu_model0[i] = '\0';
529 cpu_model1[16] = '\0';
530 for (i = 15 ; i >= 0 ; i--) {
531 if (cpu_model1[i] != ' ')
533 cpu_model1[i] = '\0';
536 for (i = 7 ; i >= 0 ; i--) {
537 if (cpu_ver[i] != ' ')
542 printk(KERN_INFO "M32R-mp information\n");
543 printk(KERN_INFO " On-chip CPUs : %d\n", nr_cpu);
544 printk(KERN_INFO " CPU model : %s/%s(%s)\n", cpu_model0,
545 cpu_model1, cpu_ver);
549 * The bootstrap kernel entry code has set these up. Save them for
552 static void __init smp_store_cpu_info(int cpu_id)
554 struct cpuinfo_m32r *ci = cpu_data + cpu_id;
557 ci->loops_per_jiffy = loops_per_jiffy;
560 static void __init show_cpu_info(int cpu_id)
562 struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
564 printk("CPU#%d : ", cpu_id);
566 #define PRINT_CLOCK(name, value) \
567 printk(name " clock %d.%02dMHz", \
568 ((value) / 1000000), ((value) % 1000000) / 10000)
570 PRINT_CLOCK("CPU", (int)ci->cpu_clock);
571 PRINT_CLOCK(", Bus", (int)ci->bus_clock);
572 printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
576 * the frequency of the profiling timer can be changed
577 * by writing a multiplier value into /proc/profile.
579 int setup_profiling_timer(unsigned int multiplier)
584 * Sanity check. [at least 500 APIC cycles should be
585 * between APIC interrupts as a rule of thumb, to avoid
588 if ( (!multiplier) || (calibration_result / multiplier < 500))
592 * Set the new multiplier for each CPU. CPUs don't start using the
593 * new values until the next timer interrupt in which they do process
594 * accounting. At that time they also adjust their APIC timers
597 for (i = 0; i < NR_CPUS; ++i)
598 per_cpu(prof_multiplier, i) = multiplier;
603 /* Initialize all maps between cpu number and apicids */
604 static void __init init_cpu_to_physid(void)
608 for (i = 0 ; i < NR_CPUS ; i++) {
609 cpu_2_physid[i] = -1;
610 physid_2_cpu[i] = -1;
615 * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
616 * else physical apic ids
618 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
620 physid_2_cpu[phys_id] = cpu_id;
621 cpu_2_physid[cpu_id] = phys_id;
625 * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
626 * else physical apic ids
628 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
630 physid_2_cpu[phys_id] = -1;
631 cpu_2_physid[cpu_id] = -1;