aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/kernel/cps-vec.S
blob: e6e97d2a5c9e68cccde81ab0f181184d1e27fd13 (plain) (blame)
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
/*
 * Copyright (C) 2013 Imagination Technologies
 * Author: Paul Burton <paul.burton@imgtec.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <asm/addrspace.h>
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/asmmacro.h>
#include <asm/cacheops.h>
#include <asm/eva.h>
#include <asm/mipsregs.h>
#include <asm/mipsmtregs.h>
#include <asm/pm.h>

#define GCR_CL_COHERENCE_OFS	0x2008
#define GCR_CL_ID_OFS		0x2028

.extern mips_cm_base

.set noreorder

	/*
	 * Set dest to non-zero if the core supports the MT ASE, else zero. If
	 * MT is not supported then branch to nomt.
	 */
	.macro	has_mt	dest, nomt
	mfc0	\dest, CP0_CONFIG
	bgez	\dest, \nomt
	 mfc0	\dest, CP0_CONFIG, 1
	bgez	\dest, \nomt
	 mfc0	\dest, CP0_CONFIG, 2
	bgez	\dest, \nomt
	 mfc0	\dest, CP0_CONFIG, 3
	andi	\dest, \dest, MIPS_CONF3_MT
	beqz	\dest, \nomt
	.endm

.section .text.cps-vec
.balign 0x1000

LEAF(mips_cps_core_entry)
	/*
	 * These first 12 bytes will be patched by cps_smp_setup to load the
	 * base address of the CM GCRs into register v1 and the CCA to use into
	 * register s0.
	 */
	.quad	0
	.word	0

	/* Check whether we're here due to an NMI */
	mfc0	k0, CP0_STATUS
	and	k0, k0, ST0_NMI
	beqz	k0, not_nmi
	 nop

	/* This is an NMI */
	la	k0, nmi_handler
	jr	k0
	 nop

not_nmi:
	/* Setup Cause */
	li	t0, CAUSEF_IV
	mtc0	t0, CP0_CAUSE

	/* Setup Status */
	li	t0, ST0_CU1 | ST0_CU0
	mtc0	t0, CP0_STATUS

	/*
	 * Clear the bits used to index the caches. Note that the architecture
	 * dictates that writing to any of TagLo or TagHi selects 0 or 2 should
	 * be valid for all MIPS32 CPUs, even those for which said writes are
	 * unnecessary.
	 */
	mtc0	zero, CP0_TAGLO, 0
	mtc0	zero, CP0_TAGHI, 0
	mtc0	zero, CP0_TAGLO, 2
	mtc0	zero, CP0_TAGHI, 2
	ehb

	/* Primary cache configuration is indicated by Config1 */
	mfc0	v0, CP0_CONFIG, 1

	/* Detect I-cache line size */
	_EXT	t0, v0, MIPS_CONF1_IL_SHF, MIPS_CONF1_IL_SZ
	beqz	t0, icache_done
	 li	t1, 2
	sllv	t0, t1, t0

	/* Detect I-cache size */
	_EXT	t1, v0, MIPS_CONF1_IS_SHF, MIPS_CONF1_IS_SZ
	xori	t2, t1, 0x7
	beqz	t2, 1f
	 li	t3, 32
	addi	t1, t1, 1
	sllv	t1, t3, t1
1:	/* At this point t1 == I-cache sets per way */
	_EXT	t2, v0, MIPS_CONF1_IA_SHF, MIPS_CONF1_IA_SZ
	addi	t2, t2, 1
	mul	t1, t1, t0
	mul	t1, t1, t2

	li	a0, KSEG0
	add	a1, a0, t1
1:	cache	Index_Store_Tag_I, 0(a0)
	add	a0, a0, t0
	bne	a0, a1, 1b
	 nop
icache_done:

	/* Detect D-cache line size */
	_EXT	t0, v0, MIPS_CONF1_DL_SHF, MIPS_CONF1_DL_SZ
	beqz	t0, dcache_done
	 li	t1, 2
	sllv	t0, t1, t0

	/* Detect D-cache size */
	_EXT	t1, v0, MIPS_CONF1_DS_SHF, MIPS_CONF1_DS_SZ
	xori	t2, t1, 0x7
	beqz	t2, 1f
	 li	t3, 32
	addi	t1, t1, 1
	sllv	t1, t3, t1
1:	/* At this point t1 == D-cache sets per way */
	_EXT	t2, v0, MIPS_CONF1_DA_SHF, MIPS_CONF1_DA_SZ
	addi	t2, t2, 1
	mul	t1, t1, t0
	mul	t1, t1, t2

	li	a0, KSEG0
	addu	a1, a0, t1
	subu	a1, a1, t0
1:	cache	Index_Store_Tag_D, 0(a0)
	bne	a0, a1, 1b
	 add	a0, a0, t0
dcache_done:

	/* Set Kseg0 CCA to that in s0 */
	mfc0	t0, CP0_CONFIG
	ori	t0, 0x7
	xori	t0, 0x7
	or	t0, t0, s0
	mtc0	t0, CP0_CONFIG
	ehb

	/* Enter the coherent domain */
	li	t0, 0xff
	sw	t0, GCR_CL_COHERENCE_OFS(v1)
	ehb

	/* Jump to kseg0 */
	la	t0, 1f
	jr	t0
	 nop

	/*
	 * We're up, cached & coherent. Perform any further required core-level
	 * initialisation.
	 */
1:	jal	mips_cps_core_init
	 nop

	/* Do any EVA initialization if necessary */
	eva_init

	/*
	 * Boot any other VPEs within this core that should be online, and
	 * deactivate this VPE if it should be offline.
	 */
	jal	mips_cps_boot_vpes
	 nop

	/* Off we go! */
	lw	t1, VPEBOOTCFG_PC(v0)
	lw	gp, VPEBOOTCFG_GP(v0)
	lw	sp, VPEBOOTCFG_SP(v0)
	jr	t1
	 nop
	END(mips_cps_core_entry)

.org 0x200
LEAF(excep_tlbfill)
	b	.
	 nop
	END(excep_tlbfill)

.org 0x280
LEAF(excep_xtlbfill)
	b	.
	 nop
	END(excep_xtlbfill)

.org 0x300
LEAF(excep_cache)
	b	.
	 nop
	END(excep_cache)

.org 0x380
LEAF(excep_genex)
	b	.
	 nop
	END(excep_genex)

.org 0x400
LEAF(excep_intex)
	b	.
	 nop
	END(excep_intex)

.org 0x480
LEAF(excep_ejtag)
	la	k0, ejtag_debug_handler
	jr	k0
	 nop
	END(excep_ejtag)

LEAF(mips_cps_core_init)
#ifdef CONFIG_MIPS_MT
	/* Check that the core implements the MT ASE */
	has_mt	t0, 3f
	 nop

	.set	push
	.set	mt

	/* Only allow 1 TC per VPE to execute... */
	dmt

	/* ...and for the moment only 1 VPE */
	dvpe
	la	t1, 1f
	jr.hb	t1
	 nop

	/* Enter VPE configuration state */
1:	mfc0	t0, CP0_MVPCONTROL
	ori	t0, t0, MVPCONTROL_VPC
	mtc0	t0, CP0_MVPCONTROL

	/* Retrieve the number of VPEs within the core */
	mfc0	t0, CP0_MVPCONF0
	srl	t0, t0, MVPCONF0_PVPE_SHIFT
	andi	t0, t0, (MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT)
	addi	t7, t0, 1

	/* If there's only 1, we're done */
	beqz	t0, 2f
	 nop

	/* Loop through each VPE within this core */
	li	t5, 1

1:	/* Operate on the appropriate TC */
	mtc0	t5, CP0_VPECONTROL
	ehb

	/* Bind TC to VPE (1:1 TC:VPE mapping) */
	mttc0	t5, CP0_TCBIND

	/* Set exclusive TC, non-active, master */
	li	t0, VPECONF0_MVP
	sll	t1, t5, VPECONF0_XTC_SHIFT
	or	t0, t0, t1
	mttc0	t0, CP0_VPECONF0

	/* Set TC non-active, non-allocatable */
	mttc0	zero, CP0_TCSTATUS

	/* Set TC halted */
	li	t0, TCHALT_H
	mttc0	t0, CP0_TCHALT

	/* Next VPE */
	addi	t5, t5, 1
	slt	t0, t5, t7
	bnez	t0, 1b
	 nop

	/* Leave VPE configuration state */
2:	mfc0	t0, CP0_MVPCONTROL
	xori	t0, t0, MVPCONTROL_VPC
	mtc0	t0, CP0_MVPCONTROL

3:	.set	pop
#endif
	jr	ra
	 nop
	END(mips_cps_core_init)

LEAF(mips_cps_boot_vpes)
	/* Retrieve CM base address */
	la	t0, mips_cm_base
	lw	t0, 0(t0)

	/* Calculate a pointer to this cores struct core_boot_config */
	lw	t0, GCR_CL_ID_OFS(t0)
	li	t1, COREBOOTCFG_SIZE
	mul	t0, t0, t1
	la	t1, mips_cps_core_bootcfg
	lw	t1, 0(t1)
	addu	t0, t0, t1

	/* Calculate this VPEs ID. If the core doesn't support MT use 0 */
	has_mt	t6, 1f
	 li	t9, 0

	/* Find the number of VPEs present in the core */
	mfc0	t1, CP0_MVPCONF0
	srl	t1, t1, MVPCONF0_PVPE_SHIFT
	andi	t1, t1, MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT
	addi	t1, t1, 1

	/* Calculate a mask for the VPE ID from EBase.CPUNum */
	clz	t1, t1
	li	t2, 31
	subu	t1, t2, t1
	li	t2, 1
	sll	t1, t2, t1
	addiu	t1, t1, -1

	/* Retrieve the VPE ID from EBase.CPUNum */
	mfc0	t9, $15, 1
	and	t9, t9, t1

1:	/* Calculate a pointer to this VPEs struct vpe_boot_config */
	li	t1, VPEBOOTCFG_SIZE
	mul	v0, t9, t1
	lw	t7, COREBOOTCFG_VPECONFIG(t0)
	addu	v0, v0, t7

#ifdef CONFIG_MIPS_MT

	/* If the core doesn't support MT then return */
	bnez	t6, 1f
	 nop
	jr	ra
	 nop

	.set	push
	.set	mt

1:	/* Enter VPE configuration state */
	dvpe
	la	t1, 1f
	jr.hb	t1
	 nop
1:	mfc0	t1, CP0_MVPCONTROL
	ori	t1, t1, MVPCONTROL_VPC
	mtc0	t1, CP0_MVPCONTROL
	ehb

	/* Loop through each VPE */
	lw	t6, COREBOOTCFG_VPEMASK(t0)
	move	t8, t6
	li	t5, 0

	/* Check whether the VPE should be running. If not, skip it */
1:	andi	t0, t6, 1
	beqz	t0, 2f
	 nop

	/* Operate on the appropriate TC */
	mfc0	t0, CP0_VPECONTROL
	ori	t0, t0, VPECONTROL_TARGTC
	xori	t0, t0, VPECONTROL_TARGTC
	or	t0, t0, t5
	mtc0	t0, CP0_VPECONTROL
	ehb

	/* Skip the VPE if its TC is not halted */
	mftc0	t0, CP0_TCHALT
	beqz	t0, 2f
	 nop

	/* Calculate a pointer to the VPEs struct vpe_boot_config */
	li	t0, VPEBOOTCFG_SIZE
	mul	t0, t0, t5
	addu	t0, t0, t7

	/* Set the TC restart PC */
	lw	t1, VPEBOOTCFG_PC(t0)
	mttc0	t1, CP0_TCRESTART

	/* Set the TC stack pointer */
	lw	t1, VPEBOOTCFG_SP(t0)
	mttgpr	t1, sp

	/* Set the TC global pointer */
	lw	t1, VPEBOOTCFG_GP(t0)
	mttgpr	t1, gp

	/* Copy config from this VPE */
	mfc0	t0, CP0_CONFIG
	mttc0	t0, CP0_CONFIG

	/* Ensure no software interrupts are pending */
	mttc0	zero, CP0_CAUSE
	mttc0	zero, CP0_STATUS

	/* Set TC active, not interrupt exempt */
	mftc0	t0, CP0_TCSTATUS
	li	t1, ~TCSTATUS_IXMT
	and	t0, t0, t1
	ori	t0, t0, TCSTATUS_A
	mttc0	t0, CP0_TCSTATUS

	/* Clear the TC halt bit */
	mttc0	zero, CP0_TCHALT

	/* Set VPE active */
	mftc0	t0, CP0_VPECONF0
	ori	t0, t0, VPECONF0_VPA
	mttc0	t0, CP0_VPECONF0

	/* Next VPE */
2:	srl	t6, t6, 1
	addi	t5, t5, 1
	bnez	t6, 1b
	 nop

	/* Leave VPE configuration state */
	mfc0	t1, CP0_MVPCONTROL
	xori	t1, t1, MVPCONTROL_VPC
	mtc0	t1, CP0_MVPCONTROL
	ehb
	evpe

	/* Check whether this VPE is meant to be running */
	li	t0, 1
	sll	t0, t0, t9
	and	t0, t0, t8
	bnez	t0, 2f
	 nop

	/* This VPE should be offline, halt the TC */
	li	t0, TCHALT_H
	mtc0	t0, CP0_TCHALT
	la	t0, 1f
1:	jr.hb	t0
	 nop

2:	.set	pop

#endif /* CONFIG_MIPS_MT */

	/* Return */
	jr	ra
	 nop
	END(mips_cps_boot_vpes)

#if defined(CONFIG_MIPS_CPS_PM) && defined(CONFIG_CPU_PM)

	/* Calculate a pointer to this CPUs struct mips_static_suspend_state */
	.macro	psstate	dest
	.set	push
	.set	noat
	lw	$1, TI_CPU(gp)
	sll	$1, $1, LONGLOG
	la	\dest, __per_cpu_offset
	addu	$1, $1, \dest
	lw	$1, 0($1)
	la	\dest, cps_cpu_state
	addu	\dest, \dest, $1
	.set	pop
	.endm

LEAF(mips_cps_pm_save)
	/* Save CPU state */
	SUSPEND_SAVE_REGS
	psstate	t1
	SUSPEND_SAVE_STATIC
	jr	v0
	 nop
	END(mips_cps_pm_save)

LEAF(mips_cps_pm_restore)
	/* Restore CPU state */
	psstate	t1
	RESUME_RESTORE_STATIC
	RESUME_RESTORE_REGS_RETURN
	END(mips_cps_pm_restore)

#endif /* CONFIG_MIPS_CPS_PM && CONFIG_CPU_PM */