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Linux 4.19.133
[linux/fpc-iii.git] / drivers / acpi / acpi_processor.c
bloba448cdf567188ea50f533a2cbfdb4d527c7a2576
1 /*
2 * acpi_processor.c - ACPI processor enumeration support
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * Copyright (C) 2013, Intel Corporation
9 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License version 2 as published
13 * by the Free Software Foundation.
14 */
15
16 #include <linux/acpi.h>
17 #include <linux/device.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/pci.h>
21
22 #include <acpi/processor.h>
23
24 #include <asm/cpu.h>
25
26 #include "internal.h"
27
28 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
29
30 ACPI_MODULE_NAME("processor");
31
32 DEFINE_PER_CPU(struct acpi_processor *, processors);
33 EXPORT_PER_CPU_SYMBOL(processors);
34
35 /* --------------------------------------------------------------------------
36 Errata Handling
37 -------------------------------------------------------------------------- */
38
39 struct acpi_processor_errata errata __read_mostly;
40 EXPORT_SYMBOL_GPL(errata);
41
42 static int acpi_processor_errata_piix4(struct pci_dev *dev)
43 {
44 u8 value1 = 0;
45 u8 value2 = 0;
46
47
48 if (!dev)
49 return -EINVAL;
50
51 /*
52 * Note that 'dev' references the PIIX4 ACPI Controller.
53 */
54
55 switch (dev->revision) {
56 case 0:
57 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
58 break;
59 case 1:
60 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
61 break;
62 case 2:
63 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
64 break;
65 case 3:
66 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
67 break;
68 default:
69 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
70 break;
71 }
72
73 switch (dev->revision) {
74
75 case 0: /* PIIX4 A-step */
76 case 1: /* PIIX4 B-step */
77 /*
78 * See specification changes #13 ("Manual Throttle Duty Cycle")
79 * and #14 ("Enabling and Disabling Manual Throttle"), plus
80 * erratum #5 ("STPCLK# Deassertion Time") from the January
81 * 2002 PIIX4 specification update. Applies to only older
82 * PIIX4 models.
83 */
84 errata.piix4.throttle = 1;
85 /* fall through*/
86
87 case 2: /* PIIX4E */
88 case 3: /* PIIX4M */
89 /*
90 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
91 * Livelock") from the January 2002 PIIX4 specification update.
92 * Applies to all PIIX4 models.
93 */
94
95 /*
96 * BM-IDE
97 * ------
98 * Find the PIIX4 IDE Controller and get the Bus Master IDE
99 * Status register address. We'll use this later to read
100 * each IDE controller's DMA status to make sure we catch all
101 * DMA activity.
102 */
103 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
104 PCI_DEVICE_ID_INTEL_82371AB,
105 PCI_ANY_ID, PCI_ANY_ID, NULL);
106 if (dev) {
107 errata.piix4.bmisx = pci_resource_start(dev, 4);
108 pci_dev_put(dev);
109 }
110
111 /*
112 * Type-F DMA
113 * ----------
114 * Find the PIIX4 ISA Controller and read the Motherboard
115 * DMA controller's status to see if Type-F (Fast) DMA mode
116 * is enabled (bit 7) on either channel. Note that we'll
117 * disable C3 support if this is enabled, as some legacy
118 * devices won't operate well if fast DMA is disabled.
119 */
120 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
121 PCI_DEVICE_ID_INTEL_82371AB_0,
122 PCI_ANY_ID, PCI_ANY_ID, NULL);
123 if (dev) {
124 pci_read_config_byte(dev, 0x76, &value1);
125 pci_read_config_byte(dev, 0x77, &value2);
126 if ((value1 & 0x80) || (value2 & 0x80))
127 errata.piix4.fdma = 1;
128 pci_dev_put(dev);
129 }
130
131 break;
132 }
133
134 if (errata.piix4.bmisx)
135 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
136 "Bus master activity detection (BM-IDE) erratum enabled\n"));
137 if (errata.piix4.fdma)
138 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
139 "Type-F DMA livelock erratum (C3 disabled)\n"));
140
141 return 0;
142 }
143
144 static int acpi_processor_errata(void)
145 {
146 int result = 0;
147 struct pci_dev *dev = NULL;
148
149 /*
150 * PIIX4
151 */
152 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
153 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
154 PCI_ANY_ID, NULL);
155 if (dev) {
156 result = acpi_processor_errata_piix4(dev);
157 pci_dev_put(dev);
158 }
159
160 return result;
161 }
162
163 /* --------------------------------------------------------------------------
164 Initialization
165 -------------------------------------------------------------------------- */
166
167 #ifdef CONFIG_ACPI_HOTPLUG_CPU
168 int __weak acpi_map_cpu(acpi_handle handle,
169 phys_cpuid_t physid, u32 acpi_id, int *pcpu)
170 {
171 return -ENODEV;
172 }
173
174 int __weak acpi_unmap_cpu(int cpu)
175 {
176 return -ENODEV;
177 }
178
179 int __weak arch_register_cpu(int cpu)
180 {
181 return -ENODEV;
182 }
183
184 void __weak arch_unregister_cpu(int cpu) {}
185
186 static int acpi_processor_hotadd_init(struct acpi_processor *pr)
187 {
188 unsigned long long sta;
189 acpi_status status;
190 int ret;
191
192 if (invalid_phys_cpuid(pr->phys_id))
193 return -ENODEV;
194
195 status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
196 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
197 return -ENODEV;
198
199 cpu_maps_update_begin();
200 cpu_hotplug_begin();
201
202 ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);
203 if (ret)
204 goto out;
205
206 ret = arch_register_cpu(pr->id);
207 if (ret) {
208 acpi_unmap_cpu(pr->id);
209 goto out;
210 }
211
212 /*
213 * CPU got hot-added, but cpu_data is not initialized yet. Set a flag
214 * to delay cpu_idle/throttling initialization and do it when the CPU
215 * gets online for the first time.
216 */
217 pr_info("CPU%d has been hot-added\n", pr->id);
218 pr->flags.need_hotplug_init = 1;
219
220 out:
221 cpu_hotplug_done();
222 cpu_maps_update_done();
223 return ret;
224 }
225 #else
226 static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
227 {
228 return -ENODEV;
229 }
230 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
231
232 static int acpi_processor_get_info(struct acpi_device *device)
233 {
234 union acpi_object object = { 0 };
235 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
236 struct acpi_processor *pr = acpi_driver_data(device);
237 int device_declaration = 0;
238 acpi_status status = AE_OK;
239 static int cpu0_initialized;
240 unsigned long long value;
241
242 acpi_processor_errata();
243
244 /*
245 * Check to see if we have bus mastering arbitration control. This
246 * is required for proper C3 usage (to maintain cache coherency).
247 */
248 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
249 pr->flags.bm_control = 1;
250 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
251 "Bus mastering arbitration control present\n"));
252 } else
253 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
254 "No bus mastering arbitration control\n"));
255
256 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
257 /* Declared with "Processor" statement; match ProcessorID */
258 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
259 if (ACPI_FAILURE(status)) {
260 dev_err(&device->dev,
261 "Failed to evaluate processor object (0x%x)\n",
262 status);
263 return -ENODEV;
264 }
265
266 pr->acpi_id = object.processor.proc_id;
267 } else {
268 /*
269 * Declared with "Device" statement; match _UID.
270 * Note that we don't handle string _UIDs yet.
271 */
272 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
273 NULL, &value);
274 if (ACPI_FAILURE(status)) {
275 dev_err(&device->dev,
276 "Failed to evaluate processor _UID (0x%x)\n",
277 status);
278 return -ENODEV;
279 }
280 device_declaration = 1;
281 pr->acpi_id = value;
282 }
283
284 if (acpi_duplicate_processor_id(pr->acpi_id)) {
285 if (pr->acpi_id == 0xff)
286 dev_info_once(&device->dev,
287 "Entry not well-defined, consider updating BIOS\n");
288 else
289 dev_err(&device->dev,
290 "Failed to get unique processor _UID (0x%x)\n",
291 pr->acpi_id);
292 return -ENODEV;
293 }
294
295 pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
296 pr->acpi_id);
297 if (invalid_phys_cpuid(pr->phys_id))
298 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
299
300 pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
301 if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
302 cpu0_initialized = 1;
303 /*
304 * Handle UP system running SMP kernel, with no CPU
305 * entry in MADT
306 */
307 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
308 pr->id = 0;
309 }
310
311 /*
312 * Extra Processor objects may be enumerated on MP systems with
313 * less than the max # of CPUs. They should be ignored _iff
314 * they are physically not present.
315 *
316 * NOTE: Even if the processor has a cpuid, it may not be present
317 * because cpuid <-> apicid mapping is persistent now.
318 */
319 if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
320 int ret = acpi_processor_hotadd_init(pr);
321 if (ret)
322 return ret;
323 }
324
325 /*
326 * On some boxes several processors use the same processor bus id.
327 * But they are located in different scope. For example:
328 * \_SB.SCK0.CPU0
329 * \_SB.SCK1.CPU0
330 * Rename the processor device bus id. And the new bus id will be
331 * generated as the following format:
332 * CPU+CPU ID.
333 */
334 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
335 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
336 pr->acpi_id));
337
338 if (!object.processor.pblk_address)
339 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
340 else if (object.processor.pblk_length != 6)
341 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
342 object.processor.pblk_length);
343 else {
344 pr->throttling.address = object.processor.pblk_address;
345 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
346 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
347
348 pr->pblk = object.processor.pblk_address;
349 }
350
351 /*
352 * If ACPI describes a slot number for this CPU, we can use it to
353 * ensure we get the right value in the "physical id" field
354 * of /proc/cpuinfo
355 */
356 status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
357 if (ACPI_SUCCESS(status))
358 arch_fix_phys_package_id(pr->id, value);
359
360 return 0;
361 }
362
363 /*
364 * Do not put anything in here which needs the core to be online.
365 * For example MSR access or setting up things which check for cpuinfo_x86
366 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
367 * Such things have to be put in and set up by the processor driver's .probe().
368 */
369 static DEFINE_PER_CPU(void *, processor_device_array);
370
371 static int acpi_processor_add(struct acpi_device *device,
372 const struct acpi_device_id *id)
373 {
374 struct acpi_processor *pr;
375 struct device *dev;
376 int result = 0;
377
378 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
379 if (!pr)
380 return -ENOMEM;
381
382 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
383 result = -ENOMEM;
384 goto err_free_pr;
385 }
386
387 pr->handle = device->handle;
388 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
389 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
390 device->driver_data = pr;
391
392 result = acpi_processor_get_info(device);
393 if (result) /* Processor is not physically present or unavailable */
394 return 0;
395
396 BUG_ON(pr->id >= nr_cpu_ids);
397
398 /*
399 * Buggy BIOS check.
400 * ACPI id of processors can be reported wrongly by the BIOS.
401 * Don't trust it blindly
402 */
403 if (per_cpu(processor_device_array, pr->id) != NULL &&
404 per_cpu(processor_device_array, pr->id) != device) {
405 dev_warn(&device->dev,
406 "BIOS reported wrong ACPI id %d for the processor\n",
407 pr->id);
408 /* Give up, but do not abort the namespace scan. */
409 goto err;
410 }
411 /*
412 * processor_device_array is not cleared on errors to allow buggy BIOS
413 * checks.
414 */
415 per_cpu(processor_device_array, pr->id) = device;
416 per_cpu(processors, pr->id) = pr;
417
418 dev = get_cpu_device(pr->id);
419 if (!dev) {
420 result = -ENODEV;
421 goto err;
422 }
423
424 result = acpi_bind_one(dev, device);
425 if (result)
426 goto err;
427
428 pr->dev = dev;
429
430 /* Trigger the processor driver's .probe() if present. */
431 if (device_attach(dev) >= 0)
432 return 1;
433
434 dev_err(dev, "Processor driver could not be attached\n");
435 acpi_unbind_one(dev);
436
437 err:
438 free_cpumask_var(pr->throttling.shared_cpu_map);
439 device->driver_data = NULL;
440 per_cpu(processors, pr->id) = NULL;
441 err_free_pr:
442 kfree(pr);
443 return result;
444 }
445
446 #ifdef CONFIG_ACPI_HOTPLUG_CPU
447 /* --------------------------------------------------------------------------
448 Removal
449 -------------------------------------------------------------------------- */
450
451 static void acpi_processor_remove(struct acpi_device *device)
452 {
453 struct acpi_processor *pr;
454
455 if (!device || !acpi_driver_data(device))
456 return;
457
458 pr = acpi_driver_data(device);
459 if (pr->id >= nr_cpu_ids)
460 goto out;
461
462 /*
463 * The only reason why we ever get here is CPU hot-removal. The CPU is
464 * already offline and the ACPI device removal locking prevents it from
465 * being put back online at this point.
466 *
467 * Unbind the driver from the processor device and detach it from the
468 * ACPI companion object.
469 */
470 device_release_driver(pr->dev);
471 acpi_unbind_one(pr->dev);
472
473 /* Clean up. */
474 per_cpu(processor_device_array, pr->id) = NULL;
475 per_cpu(processors, pr->id) = NULL;
476
477 cpu_maps_update_begin();
478 cpu_hotplug_begin();
479
480 /* Remove the CPU. */
481 arch_unregister_cpu(pr->id);
482 acpi_unmap_cpu(pr->id);
483
484 cpu_hotplug_done();
485 cpu_maps_update_done();
486
487 try_offline_node(cpu_to_node(pr->id));
488
489 out:
490 free_cpumask_var(pr->throttling.shared_cpu_map);
491 kfree(pr);
492 }
493 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
494
495 #ifdef CONFIG_X86
496 static bool acpi_hwp_native_thermal_lvt_set;
497 static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
498 u32 lvl,
499 void *context,
500 void **rv)
501 {
502 u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
503 u32 capbuf[2];
504 struct acpi_osc_context osc_context = {
505 .uuid_str = sb_uuid_str,
506 .rev = 1,
507 .cap.length = 8,
508 .cap.pointer = capbuf,
509 };
510
511 if (acpi_hwp_native_thermal_lvt_set)
512 return AE_CTRL_TERMINATE;
513
514 capbuf[0] = 0x0000;
515 capbuf[1] = 0x1000; /* set bit 12 */
516
517 if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
518 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
519 u32 *capbuf_ret = osc_context.ret.pointer;
520
521 if (capbuf_ret[1] & 0x1000) {
522 acpi_handle_info(handle,
523 "_OSC native thermal LVT Acked\n");
524 acpi_hwp_native_thermal_lvt_set = true;
525 }
526 }
527 kfree(osc_context.ret.pointer);
528 }
529
530 return AE_OK;
531 }
532
533 void __init acpi_early_processor_osc(void)
534 {
535 if (boot_cpu_has(X86_FEATURE_HWP)) {
536 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
537 ACPI_UINT32_MAX,
538 acpi_hwp_native_thermal_lvt_osc,
539 NULL, NULL, NULL);
540 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
541 acpi_hwp_native_thermal_lvt_osc,
542 NULL, NULL);
543 }
544 }
545 #endif
546
547 /*
548 * The following ACPI IDs are known to be suitable for representing as
549 * processor devices.
550 */
551 static const struct acpi_device_id processor_device_ids[] = {
552
553 { ACPI_PROCESSOR_OBJECT_HID, },
554 { ACPI_PROCESSOR_DEVICE_HID, },
555
556 { }
557 };
558
559 static struct acpi_scan_handler processor_handler = {
560 .ids = processor_device_ids,
561 .attach = acpi_processor_add,
562 #ifdef CONFIG_ACPI_HOTPLUG_CPU
563 .detach = acpi_processor_remove,
564 #endif
565 .hotplug = {
566 .enabled = true,
567 },
568 };
569
570 static int acpi_processor_container_attach(struct acpi_device *dev,
571 const struct acpi_device_id *id)
572 {
573 return 1;
574 }
575
576 static const struct acpi_device_id processor_container_ids[] = {
577 { ACPI_PROCESSOR_CONTAINER_HID, },
578 { }
579 };
580
581 static struct acpi_scan_handler processor_container_handler = {
582 .ids = processor_container_ids,
583 .attach = acpi_processor_container_attach,
584 };
585
586 /* The number of the unique processor IDs */
587 static int nr_unique_ids __initdata;
588
589 /* The number of the duplicate processor IDs */
590 static int nr_duplicate_ids;
591
592 /* Used to store the unique processor IDs */
593 static int unique_processor_ids[] __initdata = {
594 [0 ... NR_CPUS - 1] = -1,
595 };
596
597 /* Used to store the duplicate processor IDs */
598 static int duplicate_processor_ids[] = {
599 [0 ... NR_CPUS - 1] = -1,
600 };
601
602 static void __init processor_validated_ids_update(int proc_id)
603 {
604 int i;
605
606 if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
607 return;
608
609 /*
610 * Firstly, compare the proc_id with duplicate IDs, if the proc_id is
611 * already in the IDs, do nothing.
612 */
613 for (i = 0; i < nr_duplicate_ids; i++) {
614 if (duplicate_processor_ids[i] == proc_id)
615 return;
616 }
617
618 /*
619 * Secondly, compare the proc_id with unique IDs, if the proc_id is in
620 * the IDs, put it in the duplicate IDs.
621 */
622 for (i = 0; i < nr_unique_ids; i++) {
623 if (unique_processor_ids[i] == proc_id) {
624 duplicate_processor_ids[nr_duplicate_ids] = proc_id;
625 nr_duplicate_ids++;
626 return;
627 }
628 }
629
630 /*
631 * Lastly, the proc_id is a unique ID, put it in the unique IDs.
632 */
633 unique_processor_ids[nr_unique_ids] = proc_id;
634 nr_unique_ids++;
635 }
636
637 static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
638 u32 lvl,
639 void *context,
640 void **rv)
641 {
642 acpi_status status;
643 acpi_object_type acpi_type;
644 unsigned long long uid;
645 union acpi_object object = { 0 };
646 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
647
648 status = acpi_get_type(handle, &acpi_type);
649 if (ACPI_FAILURE(status))
650 return status;
651
652 switch (acpi_type) {
653 case ACPI_TYPE_PROCESSOR:
654 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
655 if (ACPI_FAILURE(status))
656 goto err;
657 uid = object.processor.proc_id;
658 break;
659
660 case ACPI_TYPE_DEVICE:
661 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
662 if (ACPI_FAILURE(status))
663 goto err;
664 break;
665 default:
666 goto err;
667 }
668
669 processor_validated_ids_update(uid);
670 return AE_OK;
671
672 err:
673 /* Exit on error, but don't abort the namespace walk */
674 acpi_handle_info(handle, "Invalid processor object\n");
675 return AE_OK;
676
677 }
678
679 static void __init acpi_processor_check_duplicates(void)
680 {
681 /* check the correctness for all processors in ACPI namespace */
682 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
683 ACPI_UINT32_MAX,
684 acpi_processor_ids_walk,
685 NULL, NULL, NULL);
686 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_ids_walk,
687 NULL, NULL);
688 }
689
690 bool acpi_duplicate_processor_id(int proc_id)
691 {
692 int i;
693
694 /*
695 * compare the proc_id with duplicate IDs, if the proc_id is already
696 * in the duplicate IDs, return true, otherwise, return false.
697 */
698 for (i = 0; i < nr_duplicate_ids; i++) {
699 if (duplicate_processor_ids[i] == proc_id)
700 return true;
701 }
702 return false;
703 }
704
705 void __init acpi_processor_init(void)
706 {
707 acpi_processor_check_duplicates();
708 acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
709 acpi_scan_add_handler(&processor_container_handler);
710 }
Linux with added FPC-III support