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TOMOYO Linux Cross Reference
Linux/arch/parisc/kernel/processor.c

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  1 /*
  2  *    Initial setup-routines for HP 9000 based hardware.
  3  *
  4  *    Copyright (C) 1991, 1992, 1995  Linus Torvalds
  5  *    Modifications for PA-RISC (C) 1999-2008 Helge Deller <deller@gmx.de>
  6  *    Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
  7  *    Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net>
  8  *    Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org>
  9  *    Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net>
 10  *
 11  *    Initial PA-RISC Version: 04-23-1999 by Helge Deller
 12  *
 13  *    This program is free software; you can redistribute it and/or modify
 14  *    it under the terms of the GNU General Public License as published by
 15  *    the Free Software Foundation; either version 2, or (at your option)
 16  *    any later version.
 17  *
 18  *    This program is distributed in the hope that it will be useful,
 19  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *    GNU General Public License for more details.
 22  *
 23  *    You should have received a copy of the GNU General Public License
 24  *    along with this program; if not, write to the Free Software
 25  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 26  *
 27  */
 28 #include <linux/delay.h>
 29 #include <linux/init.h>
 30 #include <linux/mm.h>
 31 #include <linux/module.h>
 32 #include <linux/seq_file.h>
 33 #include <linux/random.h>
 34 #include <linux/slab.h>
 35 #include <linux/cpu.h>
 36 #include <asm/param.h>
 37 #include <asm/cache.h>
 38 #include <asm/hardware.h>       /* for register_parisc_driver() stuff */
 39 #include <asm/processor.h>
 40 #include <asm/page.h>
 41 #include <asm/pdc.h>
 42 #include <asm/pdcpat.h>
 43 #include <asm/irq.h>            /* for struct irq_region */
 44 #include <asm/parisc-device.h>
 45 
 46 struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
 47 EXPORT_SYMBOL(boot_cpu_data);
 48 #ifdef CONFIG_PA8X00
 49 int _parisc_requires_coherency __read_mostly;
 50 EXPORT_SYMBOL(_parisc_requires_coherency);
 51 #endif
 52 
 53 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 54 
 55 /*
 56 **      PARISC CPU driver - claim "device" and initialize CPU data structures.
 57 **
 58 ** Consolidate per CPU initialization into (mostly) one module.
 59 ** Monarch CPU will initialize boot_cpu_data which shouldn't
 60 ** change once the system has booted.
 61 **
 62 ** The callback *should* do per-instance initialization of
 63 ** everything including the monarch. "Per CPU" init code in
 64 ** setup.c:start_parisc() has migrated here and start_parisc()
 65 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
 66 **
 67 ** The goal of consolidating CPU initialization into one place is
 68 ** to make sure all CPUs get initialized the same way.
 69 ** The code path not shared is how PDC hands control of the CPU to the OS.
 70 ** The initialization of OS data structures is the same (done below).
 71 */
 72 
 73 /**
 74  * init_cpu_profiler - enable/setup per cpu profiling hooks.
 75  * @cpunum: The processor instance.
 76  *
 77  * FIXME: doesn't do much yet...
 78  */
 79 static void
 80 init_percpu_prof(unsigned long cpunum)
 81 {
 82 }
 83 
 84 
 85 /**
 86  * processor_probe - Determine if processor driver should claim this device.
 87  * @dev: The device which has been found.
 88  *
 89  * Determine if processor driver should claim this chip (return 0) or not 
 90  * (return 1).  If so, initialize the chip and tell other partners in crime 
 91  * they have work to do.
 92  */
 93 static int __init processor_probe(struct parisc_device *dev)
 94 {
 95         unsigned long txn_addr;
 96         unsigned long cpuid;
 97         struct cpuinfo_parisc *p;
 98         struct pdc_pat_cpu_num cpu_info = { };
 99 
100 #ifdef CONFIG_SMP
101         if (num_online_cpus() >= nr_cpu_ids) {
102                 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
103                 return 1;
104         }
105 #else
106         if (boot_cpu_data.cpu_count > 0) {
107                 printk(KERN_INFO "CONFIG_SMP=n  ignoring additional CPUs\n");
108                 return 1;
109         }
110 #endif
111 
112         /* logical CPU ID and update global counter
113          * May get overwritten by PAT code.
114          */
115         cpuid = boot_cpu_data.cpu_count;
116         txn_addr = dev->hpa.start;      /* for legacy PDC */
117         cpu_info.cpu_num = cpu_info.cpu_loc = cpuid;
118 
119 #ifdef CONFIG_64BIT
120         if (is_pdc_pat()) {
121                 ulong status;
122                 unsigned long bytecnt;
123                 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
124 
125                 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
126                 if (!pa_pdc_cell)
127                         panic("couldn't allocate memory for PDC_PAT_CELL!");
128 
129                 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
130                         dev->mod_index, PA_VIEW, pa_pdc_cell);
131 
132                 BUG_ON(PDC_OK != status);
133 
134                 /* verify it's the same as what do_pat_inventory() found */
135                 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
136                 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
137 
138                 txn_addr = pa_pdc_cell->mod[0];   /* id_eid for IO sapic */
139 
140                 kfree(pa_pdc_cell);
141 
142                 /* get the cpu number */
143                 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
144                 BUG_ON(PDC_OK != status);
145 
146                 pr_info("Logical CPU #%lu is physical cpu #%lu at location "
147                         "0x%lx with hpa %pa\n",
148                         cpuid, cpu_info.cpu_num, cpu_info.cpu_loc,
149                         &dev->hpa.start);
150 
151 #undef USE_PAT_CPUID
152 #ifdef USE_PAT_CPUID
153 /* We need contiguous numbers for cpuid. Firmware's notion
154  * of cpuid is for physical CPUs and we just don't care yet.
155  * We'll care when we need to query PAT PDC about a CPU *after*
156  * boot time (ie shutdown a CPU from an OS perspective).
157  */
158                 if (cpu_info.cpu_num >= NR_CPUS) {
159                         printk(KERN_WARNING "IGNORING CPU at %pa,"
160                                 " cpu_slot_id > NR_CPUS"
161                                 " (%ld > %d)\n",
162                                 &dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
163                         /* Ignore CPU since it will only crash */
164                         boot_cpu_data.cpu_count--;
165                         return 1;
166                 } else {
167                         cpuid = cpu_info.cpu_num;
168                 }
169 #endif
170         }
171 #endif
172 
173         p = &per_cpu(cpu_data, cpuid);
174         boot_cpu_data.cpu_count++;
175 
176         /* initialize counters - CPU 0 gets it_value set in time_init() */
177         if (cpuid)
178                 memset(p, 0, sizeof(struct cpuinfo_parisc));
179 
180         p->loops_per_jiffy = loops_per_jiffy;
181         p->dev = dev;           /* Save IODC data in case we need it */
182         p->hpa = dev->hpa.start;        /* save CPU hpa */
183         p->cpuid = cpuid;       /* save CPU id */
184         p->txn_addr = txn_addr; /* save CPU IRQ address */
185         p->cpu_num = cpu_info.cpu_num;
186         p->cpu_loc = cpu_info.cpu_loc;
187 
188         store_cpu_topology(cpuid);
189 
190 #ifdef CONFIG_SMP
191         /*
192         ** FIXME: review if any other initialization is clobbered
193         **        for boot_cpu by the above memset().
194         */
195         init_percpu_prof(cpuid);
196 #endif
197 
198         /*
199         ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
200         ** OS control. RENDEZVOUS is the default state - see mem_set above.
201         **      p->state = STATE_RENDEZVOUS;
202         */
203 
204 #if 0
205         /* CPU 0 IRQ table is statically allocated/initialized */
206         if (cpuid) {
207                 struct irqaction actions[];
208 
209                 /*
210                 ** itimer and ipi IRQ handlers are statically initialized in
211                 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
212                 */
213                 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
214                 if (!actions) {
215                         /* not getting it's own table, share with monarch */
216                         actions = cpu_irq_actions[0];
217                 }
218 
219                 cpu_irq_actions[cpuid] = actions;
220         }
221 #endif
222 
223         /* 
224          * Bring this CPU up now! (ignore bootstrap cpuid == 0)
225          */
226 #ifdef CONFIG_SMP
227         if (cpuid) {
228                 set_cpu_present(cpuid, true);
229                 cpu_up(cpuid);
230         }
231 #endif
232 
233         return 0;
234 }
235 
236 /**
237  * collect_boot_cpu_data - Fill the boot_cpu_data structure.
238  *
239  * This function collects and stores the generic processor information
240  * in the boot_cpu_data structure.
241  */
242 void __init collect_boot_cpu_data(void)
243 {
244         unsigned long cr16_seed;
245 
246         memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
247 
248         cr16_seed = get_cycles();
249         add_device_randomness(&cr16_seed, sizeof(cr16_seed));
250 
251         boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
252 
253         /* get CPU-Model Information... */
254 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
255         if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) {
256                 printk(KERN_INFO 
257                         "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
258                         p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
259 
260                 add_device_randomness(&boot_cpu_data.pdc.model,
261                         sizeof(boot_cpu_data.pdc.model));
262         }
263 #undef p
264 
265         if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) {
266                 printk(KERN_INFO "vers  %08lx\n", 
267                         boot_cpu_data.pdc.versions);
268 
269                 add_device_randomness(&boot_cpu_data.pdc.versions,
270                         sizeof(boot_cpu_data.pdc.versions));
271         }
272 
273         if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) {
274                 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
275                         (boot_cpu_data.pdc.cpuid >> 5) & 127,
276                         boot_cpu_data.pdc.cpuid & 31,
277                         boot_cpu_data.pdc.cpuid);
278 
279                 add_device_randomness(&boot_cpu_data.pdc.cpuid,
280                         sizeof(boot_cpu_data.pdc.cpuid));
281         }
282 
283         if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
284                 printk(KERN_INFO "capabilities 0x%lx\n",
285                         boot_cpu_data.pdc.capabilities);
286 
287         if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
288                 printk(KERN_INFO "model %s\n",
289                         boot_cpu_data.pdc.sys_model_name);
290 
291         dump_stack_set_arch_desc("%s", boot_cpu_data.pdc.sys_model_name);
292 
293         boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
294         boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;
295 
296         boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
297         boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
298         boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
299 
300 #ifdef CONFIG_PA8X00
301         _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
302                                 (boot_cpu_data.cpu_type == mako2);
303 #endif
304 }
305 
306 
307 /**
308  * init_per_cpu - Handle individual processor initializations.
309  * @cpunum: logical processor number.
310  *
311  * This function handles initialization for *every* CPU
312  * in the system:
313  *
314  * o Set "default" CPU width for trap handlers
315  *
316  * o Enable FP coprocessor
317  *   REVISIT: this could be done in the "code 22" trap handler.
318  *      (frowands idea - that way we know which processes need FP
319  *      registers saved on the interrupt stack.)
320  *   NEWS FLASH: wide kernels need FP coprocessor enabled to handle
321  *      formatted printing of %lx for example (double divides I think)
322  *
323  * o Enable CPU profiling hooks.
324  */
325 int __init init_per_cpu(int cpunum)
326 {
327         int ret;
328         struct pdc_coproc_cfg coproc_cfg;
329 
330         set_firmware_width();
331         ret = pdc_coproc_cfg(&coproc_cfg);
332 
333         store_cpu_topology(cpunum);
334 
335         if(ret >= 0 && coproc_cfg.ccr_functional) {
336                 mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */
337 
338                 /* FWIW, FP rev/model is a more accurate way to determine
339                 ** CPU type. CPU rev/model has some ambiguous cases.
340                 */
341                 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
342                 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
343 
344                 if (cpunum == 0)
345                         printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
346                                 cpunum, coproc_cfg.revision, coproc_cfg.model);
347 
348                 /*
349                 ** store status register to stack (hopefully aligned)
350                 ** and clear the T-bit.
351                 */
352                 asm volatile ("fstd    %fr0,8(%sp)");
353 
354         } else {
355                 printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
356                         " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
357 #ifdef CONFIG_64BIT
358                         "Halting Machine - FP required\n"
359 #endif
360                         , coproc_cfg.ccr_functional);
361 #ifdef CONFIG_64BIT
362                 mdelay(100);    /* previous chars get pushed to console */
363                 panic("FP CoProc not reported");
364 #endif
365         }
366 
367         /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
368         init_percpu_prof(cpunum);
369 
370         return ret;
371 }
372 
373 /*
374  * Display CPU info for all CPUs.
375  */
376 int
377 show_cpuinfo (struct seq_file *m, void *v)
378 {
379         unsigned long cpu;
380 
381         for_each_online_cpu(cpu) {
382                 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
383 #ifdef CONFIG_SMP
384                 if (0 == cpuinfo->hpa)
385                         continue;
386 #endif
387                 seq_printf(m, "processor\t: %lu\n"
388                                 "cpu family\t: PA-RISC %s\n",
389                                  cpu, boot_cpu_data.family_name);
390 
391                 seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );
392 
393                 /* cpu MHz */
394                 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
395                                  boot_cpu_data.cpu_hz / 1000000,
396                                  boot_cpu_data.cpu_hz % 1000000  );
397 
398 #ifdef CONFIG_PARISC_CPU_TOPOLOGY
399                 seq_printf(m, "physical id\t: %d\n",
400                                 topology_physical_package_id(cpu));
401                 seq_printf(m, "siblings\t: %d\n",
402                                 cpumask_weight(topology_core_cpumask(cpu)));
403                 seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu));
404 #endif
405 
406                 seq_printf(m, "capabilities\t:");
407                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
408                         seq_puts(m, " os32");
409                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
410                         seq_puts(m, " os64");
411                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)
412                         seq_puts(m, " iopdir_fdc");
413                 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) {
414                 case PDC_MODEL_NVA_SUPPORTED:
415                         seq_puts(m, " nva_supported");
416                         break;
417                 case PDC_MODEL_NVA_SLOW:
418                         seq_puts(m, " nva_slow");
419                         break;
420                 case PDC_MODEL_NVA_UNSUPPORTED:
421                         seq_puts(m, " needs_equivalent_aliasing");
422                         break;
423                 }
424                 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities);
425 
426                 seq_printf(m, "model\t\t: %s\n"
427                                 "model name\t: %s\n",
428                                  boot_cpu_data.pdc.sys_model_name,
429                                  cpuinfo->dev ?
430                                  cpuinfo->dev->name : "Unknown");
431 
432                 seq_printf(m, "hversion\t: 0x%08x\n"
433                                 "sversion\t: 0x%08x\n",
434                                  boot_cpu_data.hversion,
435                                  boot_cpu_data.sversion );
436 
437                 /* print cachesize info */
438                 show_cache_info(m);
439 
440                 seq_printf(m, "bogomips\t: %lu.%02lu\n",
441                              cpuinfo->loops_per_jiffy / (500000 / HZ),
442                              (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100);
443 
444                 seq_printf(m, "software id\t: %ld\n\n",
445                                 boot_cpu_data.pdc.model.sw_id);
446         }
447         return 0;
448 }
449 
450 static const struct parisc_device_id processor_tbl[] __initconst = {
451         { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
452         { 0, }
453 };
454 
455 static struct parisc_driver cpu_driver __refdata = {
456         .name           = "CPU",
457         .id_table       = processor_tbl,
458         .probe          = processor_probe
459 };
460 
461 /**
462  * processor_init - Processor initialization procedure.
463  *
464  * Register this driver.
465  */
466 void __init processor_init(void)
467 {
468         register_parisc_driver(&cpu_driver);
469 }
470 

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