xref: /titanic_50/usr/src/uts/sun4u/opl/ml/drmach_asm.s (revision 8668df41d90e075636bc3817b28ad77cbd470959) 
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 2007 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	ASI_L2_CTRL_RW_ADDR, %o3
125	ldxa	[%o3]ASI_L2_CTRL, %o3
126	sethi	%hi(ASI_L2_CTRL_UGE_TRAP), %o4
127	btst	%o3, %o4
128	bz,pn	%xcc, 3f
129	 mov	%g0, %o4
130	set	FMEM_HW_ERROR, %o4
131
132	/* set error code and stat code */
1333:
134	set	FMEM_LOOP_DONE, %o3
135	stb	%o3, [%o2]
136
137	/* turn on speculative mode again */
138	ldxa	[%g0]ASI_MCNTL, %o0
139	set	1, %o1
140	sllx	%o1, MCNTL_SPECULATIVE_SHIFT, %o1
141	andn	%o0, %o1, %o0
142	ba	4f
143	 nop
144.align 32
1454:
146	stxa	%o0, [%g0]ASI_MCNTL
147	membar	#Sync
148	wrpr	%g0, %o5, %pstate
149	retl
150	 mov	%o4, %o0
151.align 8
1525:
153	ALTENTRY(drmach_fmem_loop_script_rtn)
154	/*
155	 * busy wait will affect sibling strands so
156	 * we put sleep instruction in the delay slot
157	 */
158	ba	2b
159.word	 0x81b01060
160	SET_SIZE(drmach_fmem_loop_script)
161#endif /* lint */
162
163#if defined(lint)
164/*ARGSUSED*/
165void
166drmach_flush_icache(void)
167{ return; }
168#else /* lint */
169	.align  8
170	ENTRY_NP(drmach_flush_icache)
171	stxa	%g0, [%g0]ASI_ALL_FLUSH_L1I
172	membar	#Sync
173	retl
174	 nop
175	SET_SIZE(drmach_flush_icache)
176#endif
177
178#if defined(lint)
179/*ARGSUSED*/
180int
181drmach_fmem_exec_script(caddr_t critical, int size)
182{ return (0); }
183#else /* lint */
184.align 32
185	ENTRY_NP(drmach_fmem_exec_script)
186	/* turn off speculative mode */
187	FJSV_SPECULATIVE_OFF(%o5, %o3, %o4);
188	/* save locals to save area */
189	add	%o0, SAVE_LOCAL, %o2
190	stx	%l0, [%o2+8*0]
191	stx	%l1, [%o2+8*1]
192	stx	%l2, [%o2+8*2]
193	stx	%l3, [%o2+8*3]
194	stx	%l4, [%o2+8*4]
195	stx	%l5, [%o2+8*5]
196	stx	%l6, [%o2+8*6]
197	stx	%l7, [%o2+8*7]
198	mov	%o5, %l6
199	/* l7 is set only when FMEM cmd is issued to SCF */
200	mov	%g0, %l7
201
202	/* read the critical region to put everything in the cache */
203	mov	%o0, %o2
2040:
205	ldx	[%o2], %o4
206	sub	%o1, 8, %o1
207	brnz	%o1, 0b
208	 add	%o2, 8, %o2
209	ba	4f
210	 nop
211
212	/* we branch to 4f but eventually we branch back here to finish up */
2131:
214	mov	%l6, %o5
215	/*
216	 * save some registers for debugging
217	 * l0 - SCF_REG_BASE
218	 * l1 - SCF_TD
219	 * l2 - SCF_TD + 8
220	 * l5 - DELAY
221	 */
222	add	%o0, SAVE_LOG, %o1
223	stx	%l0, [%o1+8*0]
224	stx	%l1, [%o1+8*1]
225	stx	%l2, [%o1+8*2]
226	stx	%l5, [%o1+8*3]
227
228	add	%o0, FMEM_ISSUED, %o1
229	st	%l7, [%o1]
230
231	/* Check for L2_CTRL_UGE_TRAP error */
232	mov	ASI_L2_CTRL_RW_ADDR, %l0
233	ldxa	[%l0]ASI_L2_CTRL, %l1
234	sethi	%hi(ASI_L2_CTRL_UGE_TRAP), %l2
235	btst	%l1, %l2
236	bz,pn	%xcc, 2f
237	 nop
238	mov	FMEM_HW_ERROR, %o4
2392:
240	/* restore all locals */
241	add	%o0, SAVE_LOCAL, %o1
242	ldx	[%o1+8*0], %l0
243	ldx	[%o1+8*1], %l1
244	ldx	[%o1+8*2], %l2
245	ldx	[%o1+8*3], %l3
246	ldx	[%o1+8*4], %l4
247	ldx	[%o1+8*5], %l5
248	ldx	[%o1+8*6], %l6
249	ldx	[%o1+8*7], %l7
250
251	/* turn on speculative mode */
252	ldxa	[%g0]ASI_MCNTL, %o1
253	set	1, %o2
254	sllx	%o2, MCNTL_SPECULATIVE_SHIFT, %o2
255	andn	%o1, %o2, %o1
256	ba	3f
257	 nop
258.align 32
2593:
260	stxa	%o1, [%g0]ASI_MCNTL
261	membar	#Sync
262	/* return error code here */
263	mov	%o4, %o0
264	retl
265	 wrpr	%g0, %o5, %pstate
266
267	/* clear L2_CTRL_UGE_TRAP error bit */
2684:
269	mov	ASI_L2_CTRL_RW_ADDR, %l0
270	ldxa	[%l0]ASI_L2_CTRL, %l1
271	sethi	%hi(ASI_L2_CTRL_UGE_TRAP), %l2
272	btst	%l1, %l2
273	bz,pn	%xcc, 5f
274	 nop
275	stxa	%l2, [%l0]ASI_L2_CTRL
2765:
277	/* set up the register locations and parameters */
278	ldx	[%o0 + SCF_REG_BASE], %l0
279	ldx	[%o0 + SCF_TD], %l1
280	ldx	[%o0 + SCF_TD+8], %l2
281	ldx	[%o0 + DELAY], %l5
282
283	/* check if SCF is busy */
284	add	%l0, SCF_COMMAND, %o1
285	lduha	[%o1]ASI_IO, %o2
286	sethi	%hi(SCF_CMD_BUSY), %o3
287	btst	%o2, %o3
288	be	%xcc, 6f
289	 nop
290	ba	1b
291	 mov	FMEM_SCF_BUSY, %o4
292
293	/* clear STATUS bit */
2946:
295	add	%l0, SCF_STATUS, %o1
296	lduha	[%o1]ASI_IO, %o2
297	sethi	%hi(SCF_STATUS_READY), %o3
298	btst	%o2, %o3
299	be	%xcc, 7f
300	 nop
301	stha	%o3, [%o1]ASI_IO
302
303	/* clear CMD_COMPLETE bit */
3047:
305	mov	SCF_STATUS_CMD_COMPLETE, %o3
306	btst	%o2, %o3
307	be,a	%xcc, 8f
308	 nop
309	stha	%o3, [%o1]ASI_IO
3108:
311	add	%l0, (SCF_TDATA+0xe), %o1
312	mov	%l2, %o4
313	mov	SCF_RETRY_CNT, %o5
314
315	sethi	%hi(0xffff), %l2
316	or	%l2, %lo(0xffff), %l2
317
318	and	%o4, %l2, %o3
319
320	/*
321	 * o1 points to SCFBASE.SCF_TDATA[0xe]
322	 * l0 points to SCFBASE
323	 * crticial->SCF_TD[0] = source board #
324	 * crticial->SCF_TD[1] = target board #
325	 * l1 = critical->SCF_TD[0 - 7]
326	 * l2 = 0xffff
327	 * o4 = critical->SCF_TD[8 - 15]
328	 * o3 = (*o4) & 0xffff
329
330	/*
331	 * Because there is no parity protection on the ebus
332	 * we read the data back after the write to verify
333	 * we write 2 bytes at a time.
334	 * If the data read is not the same as data written
335	 * we retry up to a limit of FMEM_RETRY_OUT
336	 */
3379:
338	stha	%o3, [%o1]ASI_IO
339	lduha	[%o1]ASI_IO, %o2
340	sub	%o5, 1, %o5
341	brz,a	%o5, 1b
342	 mov	FMEM_RETRY_OUT, %o4
343	cmp	%o2, %o3
344	bne,a	9b
345	 nop
346
347	sub	%o1, %l0, %o2
348	cmp	%o2, (SCF_TDATA+0x8)
349	bne	%xcc, 2f
350	 srlx	%o4, 16, %o4
351	mov	%l1, %o4
352
353	/* if we have reach TDATA+8, we switch to l1 */
354	/* XXX: Why we need 2 loops??? */
3552:
356	sub	%o1, 2, %o1
357	mov	SCF_RETRY_CNT, %o5
358	and	%o4, %l2, %o3
359
360	sub	%o1, %l0, %o2
361	cmp	%o2, (SCF_TDATA)
362	bge,a	9b
363	 nop
364
365	/* if we reach TDATA, we are done */
366
367	/* read from SCF back to our buffer for debugging */
368	add	%l0, (SCF_TDATA), %o1
369	ldxa	[%o1]ASI_IO, %o2
370	stx	%o2, [%o0+SCF_TD]
371
372	add	%l0, (SCF_TDATA+8), %o1
373	ldxa	[%o1]ASI_IO, %o2
374	stx	%o2, [%o0+SCF_TD+8]
375
376
377	rd	STICK, %l1
378	add	%l5, %l1, %l5
379
380	/* Now tell SCF to do it */
381	add	%l0, SCF_COMMAND, %o1
382
383	/* 0x10A6 is the magic command */
384	sethi	%hi(0x10A6), %o2
385	or	%o2, %lo(0x10A6), %o2
386	stha	%o2, [%o1]ASI_IO
387
388	mov	1, %l7			! FMEM is issued
389
390	add	%l0, SCF_STATUS, %o1
391	sethi	%hi(SCF_STATUS_READY), %o2
392	mov	SCF_STATUS_CMD_COMPLETE, %o3
393
394	/* read STATUS_READY bit and clear it only if it is set */
395	/* XXX: this STATUS_READY checking seems meaningless */
3963:
397	lduha	[%o1]ASI_IO, %o4
398	btst	%o2, %o4
399	be	%xcc, 4f		! STATUS_READY is not set
400	 nop
401	stha	%o2, [%o1]ASI_IO	! Clear if the bit is set
402
403	/* check CMD_COMPLETE bit and clear */
4044:
405	btst	%o3, %o4
406	be	%xcc, 5f		! CMD_COMPLETE is not set
407	 nop
408	stha	%o3, [%o1]ASI_IO	! Now we are done and clear it
409	mov	FMEM_NO_ERROR, %o4
410	ba	%xcc, 6f
411	 nop
412
413	/* timeout delay checking */
4145:
415	rd	STICK, %l2
416	cmp	%l5, %l2
417	bge	%xcc, 3b
418	 nop
419	mov	FMEM_TIMEOUT, %o4
420
421	/* we are done or timed out */
4226:
423	ba,a	1b
424	 nop
425	SET_SIZE(drmach_fmem_exec_script)
426#endif /* lint */
427
428#if defined(lint)
429/*ARGSUSED*/
430void
431drmach_fmem_exec_script_end(caddr_t critical, int size)
432{ return; }
433#else /* lint */
434	ENTRY_NP(drmach_fmem_exec_script_end)
435	nop
436	SET_SIZE(drmach_fmem_exec_script_end)
437#endif /* lint */
438
439#if defined(lint)
440uint64_t
441patch_inst(uint64_t *x, uint64_t y)
442{
443	*x = y;
444	return (0);
445}
446
447#else   /* lint */
448
449	ENTRY_NP(patch_inst)
450	ldx	[%o0], %o2
451	casx	[%o0], %o2, %o1
452	flush	%o0
453	membar #Sync
454	ldx	[%o0], %o2
455	retl
456	 mov	%o2, %o0
457	SET_SIZE(patch_inst)
458
459#endif /* lint */
460
461#if defined(lint)
462void
463drmach_sys_trap()
464{
465}
466#else   /* lint */
467	ENTRY_NP(drmach_sys_trap)
468	mov	-1, %g4
469	set	sys_trap, %g5
470	jmp	%g5
471	 nop
472	SET_SIZE(drmach_sys_trap)
473#endif /* lint */
474
475#if defined(lint)
476uint64_t
477drmach_get_stick()
478{
479	return (0);
480}
481#else   /* lint */
482	ENTRY_NP(drmach_get_stick)
483	retl
484	rd	STICK, %o0
485	SET_SIZE(drmach_get_stick)
486#endif /* lint */
487
488#if defined(lint)
489/*ARGSUSED*/
490void
491drmach_flush(void)
492{}
493
494#else /* lint */
495	ENTRY_NP(drmach_flush)
496	mov	%o0, %o2
4970:
498	flush	%o2
499	sub	%o1, 8, %o1
500	brnz	%o1, 0b
501	 add	%o2, 8, %o2
502	retl
503	 nop
504	SET_SIZE(drmach_flush)
505#endif /* lint */
506