xref: /titanic_41/usr/src/uts/sun4u/opl/ml/drmach_asm.s (revision 68ae785055658995f54cb50bc0a4e120c882f11b) 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28/*
29 * This file is through cpp before being used as
30 * an inline.  It contains support routines used
31 * only by DR for the copy-rename sequence.
32 */
33
34#if defined(lint)
35#include <sys/types.h>
36#else
37#include "assym.h"
38#include "drmach_offsets.h"
39#endif /* lint */
40
41#include <sys/asm_linkage.h>
42#include <sys/param.h>
43#include <sys/privregs.h>
44#include <sys/spitregs.h>
45#include <sys/mmu.h>
46#include <sys/machthread.h>
47#include <sys/pte.h>
48#include <sys/stack.h>
49#include <sys/vis.h>
50#include <sys/intreg.h>
51#include <sys/cheetahregs.h>
52#include <sys/drmach.h>
53
54#if !defined(lint)
55
56/*
57 * turn off speculative mode to prevent unwanted memory access
58 * when we are in the FMEM loops
59 */
60
61#define	FJSV_SPECULATIVE_OFF(reg, tmp1, tmp2)				\
62	rdpr	%pstate, reg						;\
63	andn	reg, PSTATE_IE, tmp1					;\
64	wrpr	%g0, tmp1, %pstate					;\
65	ldxa	[%g0]ASI_MCNTL, tmp1					;\
66	set	1, tmp2							;\
67	sllx	tmp2, MCNTL_SPECULATIVE_SHIFT, tmp2						;\
68	or	tmp1, tmp2, tmp1					;\
69	stxa	tmp1, [%g0]ASI_MCNTL					;\
70	membar #Sync
71#endif
72
73
74#if defined(lint)
75/*ARGSUSED*/
76void
77drmach_fmem_loop_script(caddr_t critical, int size, caddr_t stat)
78{ return; }
79#else /* lint */
80	.align  8
81	ENTRY_NP(drmach_fmem_loop_script)
82	/* turn off speculative mode */
83	FJSV_SPECULATIVE_OFF(%o5, %o3, %o4);
84
85	/* read the critical region to get everything in the cache */
86	mov	%o0, %o3
870:
88	ldx	[%o3], %o4
89	sub	%o1, 8, %o1
90	brnz	%o1, 0b
91	 add	%o3, 8, %o3
92
93	/* clear L2_CTRL_UGE_TRAP error bit */
94	mov	ASI_L2_CTRL_RW_ADDR, %o1
95	ldxa	[%o1]ASI_L2_CTRL, %o3
96	sethi	%hi(ASI_L2_CTRL_UGE_TRAP), %o4
97	btst	%o3, %o4
98	bz,pn	%xcc, 1f
99	 nop
100	stxa	%o4, [%o1]ASI_L2_CTRL
101
102	/* now tell the master CPU that we are ready */
1031:
104	set	FMEM_LOOP_FMEM_READY, %o3
105	stb	%o3, [%o2]
106	membar #Sync
107	ba	 5f
108	 nop
109
110	/*
111	 * note that we branch to 5f, which branches right back to 2 here.
112	 * The trick is that when that branch instruction has already been
113	 * patched to a branch to itself - an infinite loop.
114	 * The master thread will patch it back to "ba 2b" when it
115	 * completes.
116	 */
117
118	/* Once we are back, we first check if there has been any
119	 * L2_CTRL_UGE_TRAP errors, if so we have to fail the
120	 * operation.  This will cause a panic because the system
121	 * is already in inconsistent state.
122	 */
1232:
124	mov	%g0, %o1
125	mov	ASI_L2_CTRL_RW_ADDR, %o3
126	ldxa	[%o3]ASI_L2_CTRL, %o3
127	sethi	%hi(ASI_L2_CTRL_UGE_TRAP), %o4
128	btst	%o3, %o4
129	bz,pn	%xcc, 3f
130	 mov	%g0, %o4
131	set	FMEM_HW_ERROR, %o4
132
133	/* set error code and stat code */
1343:
135	set	FMEM_LOOP_DONE, %o3
136	stb	%o3, [%o2]
137
138	/* turn on speculative mode again */
139	ldxa	[%g0]ASI_MCNTL, %o0
140	set	1, %o1
141	sllx	%o1, MCNTL_SPECULATIVE_SHIFT, %o1
142	andn	%o0, %o1, %o0
143	ba	4f
144	 nop
145.align 32
1464:
147	stxa	%o0, [%g0]ASI_MCNTL
148	membar	#Sync
149	wrpr	%g0, %o5, %pstate
150	retl
151	 mov	%o4, %o0
152.align 8
1535:
154	ALTENTRY(drmach_fmem_loop_script_rtn)
155	/*
156	 * busy wait will affect sibling strands so
157	 * we put sleep instruction in the delay slot
158	 */
159	ba	2b
160.word	 0x81b01060
161	 nop
162	SET_SIZE(drmach_fmem_loop_script)
163#endif /* lint */
164
165#if defined(lint)
166/*ARGSUSED*/
167void
168drmach_flush_icache(void)
169{ return; }
170#else /* lint */
171	.align  8
172	ENTRY_NP(drmach_flush_icache)
173	stxa	%g0, [%g0]ASI_ALL_FLUSH_L1I
174	membar	#Sync
175	retl
176	 nop
177	SET_SIZE(drmach_flush_icache)
178#endif
179
180#if defined(lint)
181/*ARGSUSED*/
182int
183drmach_fmem_exec_script(caddr_t critical, int size)
184{ return (0); }
185#else /* lint */
186.align 32
187	ENTRY_NP(drmach_fmem_exec_script)
188	/* turn off speculative mode */
189	FJSV_SPECULATIVE_OFF(%o5, %o3, %o4);
190	/* save locals to save area */
191	add	%o0, SAVE_LOCAL, %o2
192	stx	%l0, [%o2+8*0]
193	stx	%l1, [%o2+8*1]
194	stx	%l2, [%o2+8*2]
195	stx	%l3, [%o2+8*3]
196	stx	%l4, [%o2+8*4]
197	stx	%l5, [%o2+8*5]
198	stx	%l6, [%o2+8*6]
199	stx	%l7, [%o2+8*7]
200	mov	%o5, %l6
201	/* l7 is set only when FMEM cmd is issued to SCF */
202	mov	%g0, %l7
203
204	/* read the critical region to put everything in the cache */
205	mov	%o0, %o2
2060:
207	ldx	[%o2], %o4
208	sub	%o1, 8, %o1
209	brnz	%o1, 0b
210	 add	%o2, 8, %o2
211	ba	4f
212	 nop
213
214	/* we branch to 4f but eventually we branch back here to finish up */
2151:
216	mov	%l6, %o5
217	/*
218	 * save some registers for debugging
219	 * l0 - SCF_REG_BASE
220	 * l1 - SCF_TD
221	 * l2 - SCF_TD + 8
222	 * l5 - DELAY
223	 */
224	add	%o0, SAVE_LOG, %o1
225	stx	%l0, [%o1+8*0]
226	stx	%l1, [%o1+8*1]
227	stx	%l2, [%o1+8*2]
228	stx	%l5, [%o1+8*3]
229
230	add	%o0, FMEM_ISSUED, %o1
231	st	%l7, [%o1]
232
233	/* Check for L2_CTRL_UGE_TRAP error */
234	mov	ASI_L2_CTRL_RW_ADDR, %l0
235	ldxa	[%l0]ASI_L2_CTRL, %l1
236	sethi	%hi(ASI_L2_CTRL_UGE_TRAP), %l2
237	btst	%l1, %l2
238	bz,pn	%xcc, 2f
239	 nop
240	mov	FMEM_HW_ERROR, %o4
2412:
242	/* restore all locals */
243	add	%o0, SAVE_LOCAL, %o1
244	ldx	[%o1+8*0], %l0
245	ldx	[%o1+8*1], %l1
246	ldx	[%o1+8*2], %l2
247	ldx	[%o1+8*3], %l3
248	ldx	[%o1+8*4], %l4
249	ldx	[%o1+8*5], %l5
250	ldx	[%o1+8*6], %l6
251	ldx	[%o1+8*7], %l7
252
253	/* turn on speculative mode */
254	ldxa	[%g0]ASI_MCNTL, %o1
255	set	1, %o2
256	sllx	%o2, MCNTL_SPECULATIVE_SHIFT, %o2
257	andn	%o1, %o2, %o1
258	ba	3f
259	 nop
260.align 32
2613:
262	stxa	%o1, [%g0]ASI_MCNTL
263	membar	#Sync
264	/* return error code here */
265	mov	%o4, %o0
266	retl
267	 wrpr	%g0, %o5, %pstate
268
269	/* clear L2_CTRL_UGE_TRAP error bit */
2704:
271	mov	ASI_L2_CTRL_RW_ADDR, %l0
272	ldxa	[%l0]ASI_L2_CTRL, %l1
273	sethi	%hi(ASI_L2_CTRL_UGE_TRAP), %l2
274	btst	%l1, %l2
275	bz,pn	%xcc, 5f
276	 nop
277	stxa	%l2, [%l0]ASI_L2_CTRL
2785:
279	/* set up the register locations and parameters */
280	ldx	[%o0 + SCF_REG_BASE], %l0
281	ldx	[%o0 + SCF_TD], %l1
282	ldx	[%o0 + SCF_TD+8], %l2
283	ldx	[%o0 + DELAY], %l5
284
285	/* check if SCF is busy */
286	add	%l0, SCF_COMMAND, %o1
287	lduha	[%o1]ASI_IO, %o2
288	sethi	%hi(SCF_CMD_BUSY), %o3
289	btst	%o2, %o3
290	be	%xcc, 6f
291	 nop
292	ba	1b
293	 mov	FMEM_SCF_BUSY, %o4
294
295	/* clear STATUS bit */
2966:
297	add	%l0, SCF_STATUS, %o1
298	lduha	[%o1]ASI_IO, %o2
299	sethi	%hi(SCF_STATUS_READY), %o3
300	btst	%o2, %o3
301	be	%xcc, 7f
302	 nop
303	stha	%o3, [%o1]ASI_IO
304
305	/* clear CMD_COMPLETE bit */
3067:
307	mov	SCF_STATUS_CMD_COMPLETE, %o3
308	btst	%o2, %o3
309	be,a	%xcc, 8f
310	 nop
311	stha	%o3, [%o1]ASI_IO
3128:
313	add	%l0, (SCF_TDATA+0xe), %o1
314	mov	%l2, %o4
315	mov	SCF_RETRY_CNT, %o5
316
317	sethi	%hi(0xffff), %l2
318	or	%l2, %lo(0xffff), %l2
319
320	and	%o4, %l2, %o3
321
322	/*
323	 * o1 points to SCFBASE.SCF_TDATA[0xe]
324	 * l0 points to SCFBASE
325	 * crticial->SCF_TD[0] = source board #
326	 * crticial->SCF_TD[1] = target board #
327	 * l1 = critical->SCF_TD[0 - 7]
328	 * l2 = 0xffff
329	 * o4 = critical->SCF_TD[8 - 15]
330	 * o3 = (*o4) & 0xffff
331
332	/*
333	 * Because there is no parity protection on the ebus
334	 * we read the data back after the write to verify
335	 * we write 2 bytes at a time.
336	 * If the data read is not the same as data written
337	 * we retry up to a limit of FMEM_RETRY_OUT
338	 */
3399:
340	stha	%o3, [%o1]ASI_IO
341	lduha	[%o1]ASI_IO, %o2
342	sub	%o5, 1, %o5
343	brz,a	%o5, 1b
344	 mov	FMEM_RETRY_OUT, %o4
345	cmp	%o2, %o3
346	bne,a	9b
347	 nop
348
349	sub	%o1, %l0, %o2
350	cmp	%o2, (SCF_TDATA+0x8)
351	bne	%xcc, 2f
352	 srlx	%o4, 16, %o4
353	mov	%l1, %o4
354
355	/* if we have reach TDATA+8, we switch to l1 */
356	/* XXX: Why we need 2 loops??? */
3572:
358	sub	%o1, 2, %o1
359	mov	SCF_RETRY_CNT, %o5
360	and	%o4, %l2, %o3
361
362	sub	%o1, %l0, %o2
363	cmp	%o2, (SCF_TDATA)
364	bge,a	9b
365	 nop
366
367	/* if we reach TDATA, we are done */
368
369	/* read from SCF back to our buffer for debugging */
370	add	%l0, (SCF_TDATA), %o1
371	ldxa	[%o1]ASI_IO, %o2
372	stx	%o2, [%o0+SCF_TD]
373
374	add	%l0, (SCF_TDATA+8), %o1
375	ldxa	[%o1]ASI_IO, %o2
376	stx	%o2, [%o0+SCF_TD+8]
377
378
379	rd	STICK, %l1
380	add	%l5, %l1, %l5
381
382	/* Now tell SCF to do it */
383	add	%l0, SCF_COMMAND, %o1
384
385	/* 0x10A6 is the magic command */
386	sethi	%hi(0x10A6), %o2
387	or	%o2, %lo(0x10A6), %o2
388	stha	%o2, [%o1]ASI_IO
389
390	mov	1, %l7			! FMEM is issued
391
392	add	%l0, SCF_STATUS, %o1
393	sethi	%hi(SCF_STATUS_READY), %o2
394	mov	SCF_STATUS_CMD_COMPLETE, %o3
395
396	/* read STATUS_READY bit and clear it only if it is set */
397	/* XXX: this STATUS_READY checking seems meaningless */
3983:
399	lduha	[%o1]ASI_IO, %o4
400	btst	%o2, %o4
401	be	%xcc, 4f		! STATUS_READY is not set
402	 nop
403	stha	%o2, [%o1]ASI_IO	! Clear if the bit is set
404
405	/* check CMD_COMPLETE bit and clear */
4064:
407	btst	%o3, %o4
408	be	%xcc, 5f		! CMD_COMPLETE is not set
409	 nop
410	stha	%o3, [%o1]ASI_IO	! Now we are done and clear it
411	mov	FMEM_NO_ERROR, %o4
412	ba	%xcc, 6f
413	 nop
414
415	/* timeout delay checking */
4165:
417	rd	STICK, %l2
418	cmp	%l5, %l2
419	bge	%xcc, 3b
420	 nop
421	mov	FMEM_TIMEOUT, %o4
422
423	/* we are done or timed out */
4246:
425	ba,a	1b
426	 nop
427	SET_SIZE(drmach_fmem_exec_script)
428#endif /* lint */
429
430#if defined(lint)
431/*ARGSUSED*/
432void
433drmach_fmem_exec_script_end(caddr_t critical, int size)
434{ return; }
435#else /* lint */
436	ENTRY_NP(drmach_fmem_exec_script_end)
437	nop
438	SET_SIZE(drmach_fmem_exec_script_end)
439#endif /* lint */
440
441#if defined(lint)
442uint64_t
443patch_inst(uint64_t *x, uint64_t y)
444{
445	*x = y;
446	return (0);
447}
448
449#else   /* lint */
450
451	ENTRY_NP(patch_inst)
452	ldx	[%o0], %o2
453	casx	[%o0], %o2, %o1
454	flush	%o0
455	membar #Sync
456	ldx	[%o0], %o2
457	retl
458	 mov	%o2, %o0
459	SET_SIZE(patch_inst)
460
461#endif /* lint */
462
463#if defined(lint)
464void
465drmach_sys_trap()
466{
467}
468#else   /* lint */
469	ENTRY_NP(drmach_sys_trap)
470	mov	-1, %g4
471	set	sys_trap, %g5
472	jmp	%g5
473	 nop
474	SET_SIZE(drmach_sys_trap)
475#endif /* lint */
476
477#if defined(lint)
478uint64_t
479drmach_get_stick()
480{
481	return (0);
482}
483#else   /* lint */
484	ENTRY_NP(drmach_get_stick)
485	retl
486	rd	STICK, %o0
487	SET_SIZE(drmach_get_stick)
488#endif /* lint */
489
490#if defined(lint)
491/*ARGSUSED*/
492void
493drmach_flush(void)
494{}
495
496#else /* lint */
497	ENTRY_NP(drmach_flush)
498	mov	%o0, %o2
4990:
500	flush	%o2
501	sub	%o1, 8, %o1
502	brnz	%o1, 0b
503	 add	%o2, 8, %o2
504	retl
505	 nop
506	SET_SIZE(drmach_flush)
507#endif /* lint */
508