aboutsummaryrefslogtreecommitdiff
path: root/arch/ia64/sn/kernel/setup.c
blob: 44bfc7f318cbd611752fcede5459ee3182807191 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1999,2001-2005 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/kdev_t.h>
#include <linux/string.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/timex.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/serial.h>
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/interrupt.h>
#include <linux/acpi.h>
#include <linux/compiler.h>
#include <linux/sched.h>
#include <linux/root_dev.h>
#include <linux/nodemask.h>
#include <linux/pm.h>

#include <asm/io.h>
#include <asm/sal.h>
#include <asm/machvec.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/sn/arch.h>
#include <asm/sn/addrs.h>
#include <asm/sn/pda.h>
#include <asm/sn/nodepda.h>
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/simulator.h>
#include <asm/sn/leds.h>
#include <asm/sn/bte.h>
#include <asm/sn/shub_mmr.h>
#include <asm/sn/clksupport.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/geo.h>
#include "xtalk/xwidgetdev.h"
#include "xtalk/hubdev.h"
#include <asm/sn/klconfig.h>


DEFINE_PER_CPU(struct pda_s, pda_percpu);

#define MAX_PHYS_MEMORY		(1UL << 49)	/* 1 TB */

lboard_t *root_lboard[MAX_COMPACT_NODES];

extern void bte_init_node(nodepda_t *, cnodeid_t);

extern void sn_timer_init(void);
extern unsigned long last_time_offset;
extern void (*ia64_mark_idle) (int);
extern void snidle(int);
extern unsigned char acpi_kbd_controller_present;

unsigned long sn_rtc_cycles_per_second;
EXPORT_SYMBOL(sn_rtc_cycles_per_second);

DEFINE_PER_CPU(struct sn_hub_info_s, __sn_hub_info);
EXPORT_PER_CPU_SYMBOL(__sn_hub_info);

DEFINE_PER_CPU(short, __sn_cnodeid_to_nasid[MAX_NUMNODES]);
EXPORT_PER_CPU_SYMBOL(__sn_cnodeid_to_nasid);

DEFINE_PER_CPU(struct nodepda_s *, __sn_nodepda);
EXPORT_PER_CPU_SYMBOL(__sn_nodepda);

partid_t sn_partid = -1;
EXPORT_SYMBOL(sn_partid);
char sn_system_serial_number_string[128];
EXPORT_SYMBOL(sn_system_serial_number_string);
u64 sn_partition_serial_number;
EXPORT_SYMBOL(sn_partition_serial_number);
u8 sn_partition_id;
EXPORT_SYMBOL(sn_partition_id);
u8 sn_system_size;
EXPORT_SYMBOL(sn_system_size);
u8 sn_sharing_domain_size;
EXPORT_SYMBOL(sn_sharing_domain_size);
u8 sn_coherency_id;
EXPORT_SYMBOL(sn_coherency_id);
u8 sn_region_size;
EXPORT_SYMBOL(sn_region_size);

short physical_node_map[MAX_PHYSNODE_ID];

EXPORT_SYMBOL(physical_node_map);

int numionodes;

static void sn_init_pdas(char **);
static void scan_for_ionodes(void);

static nodepda_t *nodepdaindr[MAX_COMPACT_NODES];

/*
 * The format of "screen_info" is strange, and due to early i386-setup
 * code. This is just enough to make the console code think we're on a
 * VGA color display.
 */
struct screen_info sn_screen_info = {
	.orig_x = 0,
	.orig_y = 0,
	.orig_video_mode = 3,
	.orig_video_cols = 80,
	.orig_video_ega_bx = 3,
	.orig_video_lines = 25,
	.orig_video_isVGA = 1,
	.orig_video_points = 16
};

/*
 * This is here so we can use the CMOS detection in ide-probe.c to
 * determine what drives are present.  In theory, we don't need this
 * as the auto-detection could be done via ide-probe.c:do_probe() but
 * in practice that would be much slower, which is painful when
 * running in the simulator.  Note that passing zeroes in DRIVE_INFO
 * is sufficient (the IDE driver will autodetect the drive geometry).
 */
#ifdef CONFIG_IA64_GENERIC
extern char drive_info[4 * 16];
#else
char drive_info[4 * 16];
#endif

/*
 * Get nasid of current cpu early in boot before nodepda is initialized
 */
static int
boot_get_nasid(void)
{
	int nasid;

	if (ia64_sn_get_sapic_info(get_sapicid(), &nasid, NULL, NULL))
		BUG();
	return nasid;
}

/*
 * This routine can only be used during init, since
 * smp_boot_data is an init data structure.
 * We have to use smp_boot_data.cpu_phys_id to find
 * the physical id of the processor because the normal
 * cpu_physical_id() relies on data structures that
 * may not be initialized yet.
 */

static int __init pxm_to_nasid(int pxm)
{
	int i;
	int nid;

	nid = pxm_to_nid_map[pxm];
	for (i = 0; i < num_node_memblks; i++) {
		if (node_memblk[i].nid == nid) {
			return NASID_GET(node_memblk[i].start_paddr);
		}
	}
	return -1;
}

/**
 * early_sn_setup - early setup routine for SN platforms
 *
 * Sets up an initial console to aid debugging.  Intended primarily
 * for bringup.  See start_kernel() in init/main.c.
 */

void __init early_sn_setup(void)
{
	efi_system_table_t *efi_systab;
	efi_config_table_t *config_tables;
	struct ia64_sal_systab *sal_systab;
	struct ia64_sal_desc_entry_point *ep;
	char *p;
	int i, j;

	/*
	 * Parse enough of the SAL tables to locate the SAL entry point. Since, console
	 * IO on SN2 is done via SAL calls, early_printk won't work without this.
	 *
	 * This code duplicates some of the ACPI table parsing that is in efi.c & sal.c.
	 * Any changes to those file may have to be made hereas well.
	 */
	efi_systab = (efi_system_table_t *) __va(ia64_boot_param->efi_systab);
	config_tables = __va(efi_systab->tables);
	for (i = 0; i < efi_systab->nr_tables; i++) {
		if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) ==
		    0) {
			sal_systab = __va(config_tables[i].table);
			p = (char *)(sal_systab + 1);
			for (j = 0; j < sal_systab->entry_count; j++) {
				if (*p == SAL_DESC_ENTRY_POINT) {
					ep = (struct ia64_sal_desc_entry_point
					      *)p;
					ia64_sal_handler_init(__va
							      (ep->sal_proc),
							      __va(ep->gp));
					return;
				}
				p += SAL_DESC_SIZE(*p);
			}
		}
	}
	/* Uh-oh, SAL not available?? */
	printk(KERN_ERR "failed to find SAL entry point\n");
}

extern int platform_intr_list[];
extern nasid_t master_nasid;
static int __initdata shub_1_1_found = 0;

/*
 * sn_check_for_wars
 *
 * Set flag for enabling shub specific wars
 */

static inline int __init is_shub_1_1(int nasid)
{
	unsigned long id;
	int rev;

	if (is_shub2())
		return 0;
	id = REMOTE_HUB_L(nasid, SH1_SHUB_ID);
	rev = (id & SH1_SHUB_ID_REVISION_MASK) >> SH1_SHUB_ID_REVISION_SHFT;
	return rev <= 2;
}

static void __init sn_check_for_wars(void)
{
	int cnode;

	if (is_shub2()) {
		/* none yet */
	} else {
		for_each_online_node(cnode) {
			if (is_shub_1_1(cnodeid_to_nasid(cnode)))
				shub_1_1_found = 1;
		}
	}
}

/**
 * sn_setup - SN platform setup routine
 * @cmdline_p: kernel command line
 *
 * Handles platform setup for SN machines.  This includes determining
 * the RTC frequency (via a SAL call), initializing secondary CPUs, and
 * setting up per-node data areas.  The console is also initialized here.
 */
void __init sn_setup(char **cmdline_p)
{
	long status, ticks_per_sec, drift;
	int pxm;
	int major = sn_sal_rev_major(), minor = sn_sal_rev_minor();
	extern void sn_cpu_init(void);

	ia64_sn_plat_set_error_handling_features();

	/*
	 * If the generic code has enabled vga console support - lets
	 * get rid of it again. This is a kludge for the fact that ACPI
	 * currtently has no way of informing us if legacy VGA is available
	 * or not.
	 */
#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
	if (conswitchp == &vga_con) {
		printk(KERN_DEBUG "SGI: Disabling VGA console\n");
#ifdef CONFIG_DUMMY_CONSOLE
		conswitchp = &dummy_con;
#else
		conswitchp = NULL;
#endif				/* CONFIG_DUMMY_CONSOLE */
	}
#endif				/* def(CONFIG_VT) && def(CONFIG_VGA_CONSOLE) */

	MAX_DMA_ADDRESS = PAGE_OFFSET + MAX_PHYS_MEMORY;

	memset(physical_node_map, -1, sizeof(physical_node_map));
	for (pxm = 0; pxm < MAX_PXM_DOMAINS; pxm++)
		if (pxm_to_nid_map[pxm] != -1)
			physical_node_map[pxm_to_nasid(pxm)] =
			    pxm_to_nid_map[pxm];

	/*
	 * Old PROMs do not provide an ACPI FADT. Disable legacy keyboard
	 * support here so we don't have to listen to failed keyboard probe
	 * messages.
	 */
	if ((major < 2 || (major == 2 && minor <= 9)) &&
	    acpi_kbd_controller_present) {
		printk(KERN_INFO "Disabling legacy keyboard support as prom "
		       "is too old and doesn't provide FADT\n");
		acpi_kbd_controller_present = 0;
	}

	printk("SGI SAL version %x.%02x\n", major, minor);

	/*
	 * Confirm the SAL we're running on is recent enough...
	 */
	if ((major < SN_SAL_MIN_MAJOR) || (major == SN_SAL_MIN_MAJOR &&
					   minor < SN_SAL_MIN_MINOR)) {
		printk(KERN_ERR "This kernel needs SGI SAL version >= "
		       "%x.%02x\n", SN_SAL_MIN_MAJOR, SN_SAL_MIN_MINOR);
		panic("PROM version too old\n");
	}

	master_nasid = boot_get_nasid();

	status =
	    ia64_sal_freq_base(SAL_FREQ_BASE_REALTIME_CLOCK, &ticks_per_sec,
			       &drift);
	if (status != 0 || ticks_per_sec < 100000) {
		printk(KERN_WARNING
		       "unable to determine platform RTC clock frequency, guessing.\n");
		/* PROM gives wrong value for clock freq. so guess */
		sn_rtc_cycles_per_second = 1000000000000UL / 30000UL;
	} else
		sn_rtc_cycles_per_second = ticks_per_sec;

	platform_intr_list[ACPI_INTERRUPT_CPEI] = IA64_CPE_VECTOR;

	/*
	 * we set the default root device to /dev/hda
	 * to make simulation easy
	 */
	ROOT_DEV = Root_HDA1;

	/*
	 * Create the PDAs and NODEPDAs for all the cpus.
	 */
	sn_init_pdas(cmdline_p);

	ia64_mark_idle = &snidle;

	/* 
	 * For the bootcpu, we do this here. All other cpus will make the
	 * call as part of cpu_init in slave cpu initialization.
	 */
	sn_cpu_init();

#ifdef CONFIG_SMP
	init_smp_config();
#endif
	screen_info = sn_screen_info;

	sn_timer_init();

	/*
	 * set pm_power_off to a SAL call to allow
	 * sn machines to power off. The SAL call can be replaced
	 * by an ACPI interface call when ACPI is fully implemented
	 * for sn.
	 */
	pm_power_off = ia64_sn_power_down;
}

/**
 * sn_init_pdas - setup node data areas
 *
 * One time setup for Node Data Area.  Called by sn_setup().
 */
static void __init sn_init_pdas(char **cmdline_p)
{
	cnodeid_t cnode;

	memset(sn_cnodeid_to_nasid, -1,
			sizeof(__ia64_per_cpu_var(__sn_cnodeid_to_nasid)));
	for_each_online_node(cnode)
		sn_cnodeid_to_nasid[cnode] =
				pxm_to_nasid(nid_to_pxm_map[cnode]);

	numionodes = num_online_nodes();
	scan_for_ionodes();

	/*
	 * Allocate & initalize the nodepda for each node.
	 */
	for_each_online_node(cnode) {
		nodepdaindr[cnode] =
		    alloc_bootmem_node(NODE_DATA(cnode), sizeof(nodepda_t));
		memset(nodepdaindr[cnode], 0, sizeof(nodepda_t));
		memset(nodepdaindr[cnode]->phys_cpuid, -1, 
		    sizeof(nodepdaindr[cnode]->phys_cpuid));
	}

	/*
	 * Allocate & initialize nodepda for TIOs.  For now, put them on node 0.
	 */
	for (cnode = num_online_nodes(); cnode < numionodes; cnode++) {
		nodepdaindr[cnode] =
		    alloc_bootmem_node(NODE_DATA(0), sizeof(nodepda_t));
		memset(nodepdaindr[cnode], 0, sizeof(nodepda_t));
	}

	/*
	 * Now copy the array of nodepda pointers to each nodepda.
	 */
	for (cnode = 0; cnode < numionodes; cnode++)
		memcpy(nodepdaindr[cnode]->pernode_pdaindr, nodepdaindr,
		       sizeof(nodepdaindr));

	/*
	 * Set up IO related platform-dependent nodepda fields.
	 * The following routine actually sets up the hubinfo struct
	 * in nodepda.
	 */
	for_each_online_node(cnode) {
		bte_init_node(nodepdaindr[cnode], cnode);
	}

	/*
	 * Initialize the per node hubdev.  This includes IO Nodes and 
	 * headless/memless nodes.
	 */
	for (cnode = 0; cnode < numionodes; cnode++) {
		hubdev_init_node(nodepdaindr[cnode], cnode);
	}
}

/**
 * sn_cpu_init - initialize per-cpu data areas
 * @cpuid: cpuid of the caller
 *
 * Called during cpu initialization on each cpu as it starts.
 * Currently, initializes the per-cpu data area for SNIA.
 * Also sets up a few fields in the nodepda.  Also known as
 * platform_cpu_init() by the ia64 machvec code.
 */
void __init sn_cpu_init(void)
{
	int cpuid;
	int cpuphyid;
	int nasid;
	int subnode;
	int slice;
	int cnode;
	int i;
	static int wars_have_been_checked;

	memset(pda, 0, sizeof(pda));
	if (ia64_sn_get_sn_info(0, &sn_hub_info->shub2, &sn_hub_info->nasid_bitmask, &sn_hub_info->nasid_shift,
				&sn_system_size, &sn_sharing_domain_size, &sn_partition_id,
				&sn_coherency_id, &sn_region_size))
		BUG();
	sn_hub_info->as_shift = sn_hub_info->nasid_shift - 2;

	/*
	 * The boot cpu makes this call again after platform initialization is
	 * complete.
	 */
	if (nodepdaindr[0] == NULL)
		return;

	cpuid = smp_processor_id();
	cpuphyid = get_sapicid();

	if (ia64_sn_get_sapic_info(cpuphyid, &nasid, &subnode, &slice))
		BUG();

	for (i=0; i < MAX_NUMNODES; i++) {
		if (nodepdaindr[i]) {
			nodepdaindr[i]->phys_cpuid[cpuid].nasid = nasid;
			nodepdaindr[i]->phys_cpuid[cpuid].slice = slice;
			nodepdaindr[i]->phys_cpuid[cpuid].subnode = subnode;
		}
	}

	cnode = nasid_to_cnodeid(nasid);

	sn_nodepda = nodepdaindr[cnode];

	pda->led_address =
	    (typeof(pda->led_address)) (LED0 + (slice << LED_CPU_SHIFT));
	pda->led_state = LED_ALWAYS_SET;
	pda->hb_count = HZ / 2;
	pda->hb_state = 0;
	pda->idle_flag = 0;

	if (cpuid != 0) {
		/* copy cpu 0's sn_cnodeid_to_nasid table to this cpu's */
		memcpy(sn_cnodeid_to_nasid,
		       (&per_cpu(__sn_cnodeid_to_nasid, 0)),
		       sizeof(__ia64_per_cpu_var(__sn_cnodeid_to_nasid)));
	}

	/*
	 * Check for WARs.
	 * Only needs to be done once, on BSP.
	 * Has to be done after loop above, because it uses this cpu's
	 * sn_cnodeid_to_nasid table which was just initialized if this
	 * isn't cpu 0.
	 * Has to be done before assignment below.
	 */
	if (!wars_have_been_checked) {
		sn_check_for_wars();
		wars_have_been_checked = 1;
	}
	sn_hub_info->shub_1_1_found = shub_1_1_found;

	/*
	 * Set up addresses of PIO/MEM write status registers.
	 */
	{
		u64 pio1[] = {SH1_PIO_WRITE_STATUS_0, 0, SH1_PIO_WRITE_STATUS_1, 0};
		u64 pio2[] = {SH2_PIO_WRITE_STATUS_0, SH2_PIO_WRITE_STATUS_1, 
			SH2_PIO_WRITE_STATUS_2, SH2_PIO_WRITE_STATUS_3};
		u64 *pio;
		pio = is_shub1() ? pio1 : pio2;
		pda->pio_write_status_addr = (volatile unsigned long *) LOCAL_MMR_ADDR(pio[slice]);
		pda->pio_write_status_val = is_shub1() ? SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK : 0;
	}

	/*
	 * WAR addresses for SHUB 1.x.
	 */
	if (local_node_data->active_cpu_count++ == 0 && is_shub1()) {
		int buddy_nasid;
		buddy_nasid =
		    cnodeid_to_nasid(numa_node_id() ==
				     num_online_nodes() - 1 ? 0 : numa_node_id() + 1);
		pda->pio_shub_war_cam_addr =
		    (volatile unsigned long *)GLOBAL_MMR_ADDR(nasid,
							      SH1_PI_CAM_CONTROL);
	}
}

/*
 * Scan klconfig for ionodes.  Add the nasids to the
 * physical_node_map and the pda and increment numionodes.
 */

static void __init scan_for_ionodes(void)
{
	int nasid = 0;
	lboard_t *brd;

	/* Setup ionodes with memory */
	for (nasid = 0; nasid < MAX_PHYSNODE_ID; nasid += 2) {
		char *klgraph_header;
		cnodeid_t cnodeid;

		if (physical_node_map[nasid] == -1)
			continue;

		cnodeid = -1;
		klgraph_header = __va(ia64_sn_get_klconfig_addr(nasid));
		if (!klgraph_header) {
			if (IS_RUNNING_ON_SIMULATOR())
				continue;
			BUG();	/* All nodes must have klconfig tables! */
		}
		cnodeid = nasid_to_cnodeid(nasid);
		root_lboard[cnodeid] = (lboard_t *)
		    NODE_OFFSET_TO_LBOARD((nasid),
					  ((kl_config_hdr_t
					    *) (klgraph_header))->
					  ch_board_info);
	}

	/* Scan headless/memless IO Nodes. */
	for (nasid = 0; nasid < MAX_PHYSNODE_ID; nasid += 2) {
		/* if there's no nasid, don't try to read the klconfig on the node */
		if (physical_node_map[nasid] == -1)
			continue;
		brd = find_lboard_any((lboard_t *)
				      root_lboard[nasid_to_cnodeid(nasid)],
				      KLTYPE_SNIA);
		if (brd) {
			brd = KLCF_NEXT_ANY(brd);	/* Skip this node's lboard */
			if (!brd)
				continue;
		}

		brd = find_lboard_any(brd, KLTYPE_SNIA);

		while (brd) {
			sn_cnodeid_to_nasid[numionodes] = brd->brd_nasid;
			physical_node_map[brd->brd_nasid] = numionodes;
			root_lboard[numionodes] = brd;
			numionodes++;
			brd = KLCF_NEXT_ANY(brd);
			if (!brd)
				break;

			brd = find_lboard_any(brd, KLTYPE_SNIA);
		}
	}

	/* Scan for TIO nodes. */
	for (nasid = 0; nasid < MAX_PHYSNODE_ID; nasid += 2) {
		/* if there's no nasid, don't try to read the klconfig on the node */
		if (physical_node_map[nasid] == -1)
			continue;
		brd = find_lboard_any((lboard_t *)
				      root_lboard[nasid_to_cnodeid(nasid)],
				      KLTYPE_TIO);
		while (brd) {
			sn_cnodeid_to_nasid[numionodes] = brd->brd_nasid;
			physical_node_map[brd->brd_nasid] = numionodes;
			root_lboard[numionodes] = brd;
			numionodes++;
			brd = KLCF_NEXT_ANY(brd);
			if (!brd)
				break;

			brd = find_lboard_any(brd, KLTYPE_TIO);
		}
	}
}

int
nasid_slice_to_cpuid(int nasid, int slice)
{
	long cpu;
	
	for (cpu=0; cpu < NR_CPUS; cpu++) 
		if (cpuid_to_nasid(cpu) == nasid &&
					cpuid_to_slice(cpu) == slice)
			return cpu;

	return -1;
}