xref: /linux/arch/sparc/kernel/sun4v_tlb_miss.S (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2) 
1/* SPDX-License-Identifier: GPL-2.0 */
2/* sun4v_tlb_miss.S: Sun4v TLB miss handlers.
3 *
4 * Copyright (C) 2006 <davem@davemloft.net>
5 */
6
7	.text
8	.align	32
9
10	/* Load ITLB fault information into VADDR and CTX, using BASE.  */
11#define LOAD_ITLB_INFO(BASE, VADDR, CTX) \
12	ldx	[BASE + HV_FAULT_I_ADDR_OFFSET], VADDR; \
13	ldx	[BASE + HV_FAULT_I_CTX_OFFSET], CTX;
14
15	/* Load DTLB fault information into VADDR and CTX, using BASE.  */
16#define LOAD_DTLB_INFO(BASE, VADDR, CTX) \
17	ldx	[BASE + HV_FAULT_D_ADDR_OFFSET], VADDR; \
18	ldx	[BASE + HV_FAULT_D_CTX_OFFSET], CTX;
19
20	/* DEST = (VADDR >> 22)
21	 *
22	 * Branch to ZERO_CTX_LABEL if context is zero.
23	 */
24#define	COMPUTE_TAG_TARGET(DEST, VADDR, CTX, ZERO_CTX_LABEL) \
25	srlx	VADDR, 22, DEST; \
26	brz,pn	CTX, ZERO_CTX_LABEL; \
27	 nop;
28
29	/* Create TSB pointer.  This is something like:
30	 *
31	 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
32	 * tsb_base = tsb_reg & ~0x7UL;
33	 * tsb_index = ((vaddr >> HASH_SHIFT) & tsb_mask);
34	 * tsb_ptr = tsb_base + (tsb_index * 16);
35	 */
36#define COMPUTE_TSB_PTR(TSB_PTR, VADDR, HASH_SHIFT, TMP1, TMP2) \
37	and	TSB_PTR, 0x7, TMP1;			\
38	mov	512, TMP2;				\
39	andn	TSB_PTR, 0x7, TSB_PTR;			\
40	sllx	TMP2, TMP1, TMP2;			\
41	srlx	VADDR, HASH_SHIFT, TMP1;		\
42	sub	TMP2, 1, TMP2;				\
43	and	TMP1, TMP2, TMP1;			\
44	sllx	TMP1, 4, TMP1;				\
45	add	TSB_PTR, TMP1, TSB_PTR;
46
47sun4v_itlb_miss:
48	/* Load MMU Miss base into %g2.  */
49	ldxa	[%g0] ASI_SCRATCHPAD, %g2
50
51	/* Load UTSB reg into %g1.  */
52	mov	SCRATCHPAD_UTSBREG1, %g1
53	ldxa	[%g1] ASI_SCRATCHPAD, %g1
54
55	LOAD_ITLB_INFO(%g2, %g4, %g5)
56	COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_itlb_4v)
57	COMPUTE_TSB_PTR(%g1, %g4, PAGE_SHIFT, %g3, %g7)
58
59	/* Load TSB tag/pte into %g2/%g3 and compare the tag.  */
60	ldda	[%g1] ASI_QUAD_LDD_PHYS_4V, %g2
61	cmp	%g2, %g6
62	bne,a,pn %xcc, tsb_miss_page_table_walk
63	 mov	FAULT_CODE_ITLB, %g3
64	andcc	%g3, _PAGE_EXEC_4V, %g0
65	be,a,pn	%xcc, tsb_do_fault
66	 mov	FAULT_CODE_ITLB, %g3
67
68	/* We have a valid entry, make hypervisor call to load
69	 * I-TLB and return from trap.
70	 *
71	 * %g3:	PTE
72	 * %g4:	vaddr
73	 */
74sun4v_itlb_load:
75	ldxa	[%g0] ASI_SCRATCHPAD, %g6
76	mov	%o0, %g1		! save %o0
77	mov	%o1, %g2		! save %o1
78	mov	%o2, %g5		! save %o2
79	mov	%o3, %g7		! save %o3
80	mov	%g4, %o0		! vaddr
81	ldx	[%g6 + HV_FAULT_I_CTX_OFFSET], %o1	! ctx
82	mov	%g3, %o2		! PTE
83	mov	HV_MMU_IMMU, %o3	! flags
84	ta	HV_MMU_MAP_ADDR_TRAP
85	brnz,pn	%o0, sun4v_itlb_error
86	 mov	%g2, %o1		! restore %o1
87	mov	%g1, %o0		! restore %o0
88	mov	%g5, %o2		! restore %o2
89	mov	%g7, %o3		! restore %o3
90
91	retry
92
93sun4v_dtlb_miss:
94	/* Load MMU Miss base into %g2.  */
95	ldxa	[%g0] ASI_SCRATCHPAD, %g2
96
97	/* Load UTSB reg into %g1.  */
98	mov	SCRATCHPAD_UTSBREG1, %g1
99	ldxa	[%g1] ASI_SCRATCHPAD, %g1
100
101	LOAD_DTLB_INFO(%g2, %g4, %g5)
102	COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_dtlb_4v)
103	COMPUTE_TSB_PTR(%g1, %g4, PAGE_SHIFT, %g3, %g7)
104
105	/* Load TSB tag/pte into %g2/%g3 and compare the tag.  */
106	ldda	[%g1] ASI_QUAD_LDD_PHYS_4V, %g2
107	cmp	%g2, %g6
108	bne,a,pn %xcc, tsb_miss_page_table_walk
109	 mov	FAULT_CODE_DTLB, %g3
110
111	/* We have a valid entry, make hypervisor call to load
112	 * D-TLB and return from trap.
113	 *
114	 * %g3:	PTE
115	 * %g4:	vaddr
116	 */
117sun4v_dtlb_load:
118	ldxa	[%g0] ASI_SCRATCHPAD, %g6
119	mov	%o0, %g1		! save %o0
120	mov	%o1, %g2		! save %o1
121	mov	%o2, %g5		! save %o2
122	mov	%o3, %g7		! save %o3
123	mov	%g4, %o0		! vaddr
124	ldx	[%g6 + HV_FAULT_D_CTX_OFFSET], %o1	! ctx
125	mov	%g3, %o2		! PTE
126	mov	HV_MMU_DMMU, %o3	! flags
127	ta	HV_MMU_MAP_ADDR_TRAP
128	brnz,pn	%o0, sun4v_dtlb_error
129	 mov	%g2, %o1		! restore %o1
130	mov	%g1, %o0		! restore %o0
131	mov	%g5, %o2		! restore %o2
132	mov	%g7, %o3		! restore %o3
133
134	retry
135
136sun4v_dtlb_prot:
137	SET_GL(1)
138
139	/* Load MMU Miss base into %g5.  */
140	ldxa	[%g0] ASI_SCRATCHPAD, %g5
141
142	ldx	[%g5 + HV_FAULT_D_ADDR_OFFSET], %g5
143	rdpr	%tl, %g1
144	cmp	%g1, 1
145	bgu,pn	%xcc, winfix_trampoline
146	 mov	FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
147	ba,pt	%xcc, sparc64_realfault_common
148	 nop
149
150	/* Called from trap table:
151	 * %g4:	vaddr
152	 * %g5:	context
153	 * %g6: TAG TARGET
154	 */
155sun4v_itsb_miss:
156	mov	SCRATCHPAD_UTSBREG1, %g1
157	ldxa	[%g1] ASI_SCRATCHPAD, %g1
158	brz,pn	%g5, kvmap_itlb_4v
159	 mov	FAULT_CODE_ITLB, %g3
160	ba,a,pt	%xcc, sun4v_tsb_miss_common
161
162	/* Called from trap table:
163	 * %g4:	vaddr
164	 * %g5:	context
165	 * %g6: TAG TARGET
166	 */
167sun4v_dtsb_miss:
168	mov	SCRATCHPAD_UTSBREG1, %g1
169	ldxa	[%g1] ASI_SCRATCHPAD, %g1
170	brz,pn	%g5, kvmap_dtlb_4v
171	 mov	FAULT_CODE_DTLB, %g3
172
173	/* fallthrough */
174
175sun4v_tsb_miss_common:
176	COMPUTE_TSB_PTR(%g1, %g4, PAGE_SHIFT, %g5, %g7)
177
178	sub	%g2, TRAP_PER_CPU_FAULT_INFO, %g2
179
180#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
181	mov	SCRATCHPAD_UTSBREG2, %g5
182	ldxa	[%g5] ASI_SCRATCHPAD, %g5
183	cmp	%g5, -1
184	be,pt	%xcc, 80f
185	 nop
186	COMPUTE_TSB_PTR(%g5, %g4, REAL_HPAGE_SHIFT, %g2, %g7)
187
188	/* That clobbered %g2, reload it.  */
189	ldxa	[%g0] ASI_SCRATCHPAD, %g2
190	sub	%g2, TRAP_PER_CPU_FAULT_INFO, %g2
191
19280:	stx	%g5, [%g2 + TRAP_PER_CPU_TSB_HUGE_TEMP]
193#endif
194
195	ba,pt	%xcc, tsb_miss_page_table_walk_sun4v_fastpath
196	 ldx	[%g2 + TRAP_PER_CPU_PGD_PADDR], %g7
197
198sun4v_itlb_error:
199	rdpr	%tl, %g1
200	cmp	%g1, 1
201	ble,pt	%icc, sun4v_bad_ra
202	 or	%g0, FAULT_CODE_BAD_RA | FAULT_CODE_ITLB, %g1
203
204	sethi	%hi(sun4v_err_itlb_vaddr), %g1
205	stx	%g4, [%g1 + %lo(sun4v_err_itlb_vaddr)]
206	sethi	%hi(sun4v_err_itlb_ctx), %g1
207	ldxa	[%g0] ASI_SCRATCHPAD, %g6
208	ldx	[%g6 + HV_FAULT_I_CTX_OFFSET], %o1
209	stx	%o1, [%g1 + %lo(sun4v_err_itlb_ctx)]
210	sethi	%hi(sun4v_err_itlb_pte), %g1
211	stx	%g3, [%g1 + %lo(sun4v_err_itlb_pte)]
212	sethi	%hi(sun4v_err_itlb_error), %g1
213	stx	%o0, [%g1 + %lo(sun4v_err_itlb_error)]
214
215	sethi	%hi(1f), %g7
216	rdpr	%tl, %g4
217	ba,pt	%xcc, etraptl1
2181:	 or	%g7, %lo(1f), %g7
219	mov	%l4, %o1
220	call	sun4v_itlb_error_report
221	 add	%sp, PTREGS_OFF, %o0
222
223	/* NOTREACHED */
224
225sun4v_dtlb_error:
226	rdpr	%tl, %g1
227	cmp	%g1, 1
228	ble,pt	%icc, sun4v_bad_ra
229	 or	%g0, FAULT_CODE_BAD_RA | FAULT_CODE_DTLB, %g1
230
231	sethi	%hi(sun4v_err_dtlb_vaddr), %g1
232	stx	%g4, [%g1 + %lo(sun4v_err_dtlb_vaddr)]
233	sethi	%hi(sun4v_err_dtlb_ctx), %g1
234	ldxa	[%g0] ASI_SCRATCHPAD, %g6
235	ldx	[%g6 + HV_FAULT_D_CTX_OFFSET], %o1
236	stx	%o1, [%g1 + %lo(sun4v_err_dtlb_ctx)]
237	sethi	%hi(sun4v_err_dtlb_pte), %g1
238	stx	%g3, [%g1 + %lo(sun4v_err_dtlb_pte)]
239	sethi	%hi(sun4v_err_dtlb_error), %g1
240	stx	%o0, [%g1 + %lo(sun4v_err_dtlb_error)]
241
242	sethi	%hi(1f), %g7
243	rdpr	%tl, %g4
244	ba,pt	%xcc, etraptl1
2451:	 or	%g7, %lo(1f), %g7
246	mov	%l4, %o1
247	call	sun4v_dtlb_error_report
248	 add	%sp, PTREGS_OFF, %o0
249
250	/* NOTREACHED */
251
252sun4v_bad_ra:
253	or	%g0, %g4, %g5
254	ba,pt	%xcc, sparc64_realfault_common
255	 or	%g1, %g0, %g4
256
257	/* NOTREACHED */
258
259	/* Instruction Access Exception, tl0. */
260sun4v_iacc:
261	ldxa	[%g0] ASI_SCRATCHPAD, %g2
262	ldx	[%g2 + HV_FAULT_I_TYPE_OFFSET], %g3
263	ldx	[%g2 + HV_FAULT_I_ADDR_OFFSET], %g4
264	ldx	[%g2 + HV_FAULT_I_CTX_OFFSET], %g5
265	sllx	%g3, 16, %g3
266	or	%g5, %g3, %g5
267	ba,pt	%xcc, etrap
268	 rd	%pc, %g7
269	mov	%l4, %o1
270	mov	%l5, %o2
271	call	sun4v_insn_access_exception
272	 add	%sp, PTREGS_OFF, %o0
273	ba,a,pt	%xcc, rtrap
274
275	/* Instruction Access Exception, tl1. */
276sun4v_iacc_tl1:
277	ldxa	[%g0] ASI_SCRATCHPAD, %g2
278	ldx	[%g2 + HV_FAULT_I_TYPE_OFFSET], %g3
279	ldx	[%g2 + HV_FAULT_I_ADDR_OFFSET], %g4
280	ldx	[%g2 + HV_FAULT_I_CTX_OFFSET], %g5
281	sllx	%g3, 16, %g3
282	or	%g5, %g3, %g5
283	ba,pt	%xcc, etraptl1
284	 rd	%pc, %g7
285	mov	%l4, %o1
286	mov	%l5, %o2
287	call	sun4v_insn_access_exception_tl1
288	 add	%sp, PTREGS_OFF, %o0
289	ba,a,pt	%xcc, rtrap
290
291	/* Data Access Exception, tl0. */
292sun4v_dacc:
293	ldxa	[%g0] ASI_SCRATCHPAD, %g2
294	ldx	[%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
295	ldx	[%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
296	ldx	[%g2 + HV_FAULT_D_CTX_OFFSET], %g5
297	sllx	%g3, 16, %g3
298	or	%g5, %g3, %g5
299	ba,pt	%xcc, etrap
300	 rd	%pc, %g7
301	mov	%l4, %o1
302	mov	%l5, %o2
303	call	sun4v_data_access_exception
304	 add	%sp, PTREGS_OFF, %o0
305	ba,a,pt	%xcc, rtrap
306
307	/* Data Access Exception, tl1. */
308sun4v_dacc_tl1:
309	ldxa	[%g0] ASI_SCRATCHPAD, %g2
310	ldx	[%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
311	ldx	[%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
312	ldx	[%g2 + HV_FAULT_D_CTX_OFFSET], %g5
313	sllx	%g3, 16, %g3
314	or	%g5, %g3, %g5
315	ba,pt	%xcc, etraptl1
316	 rd	%pc, %g7
317	mov	%l4, %o1
318	mov	%l5, %o2
319	call	sun4v_data_access_exception_tl1
320	 add	%sp, PTREGS_OFF, %o0
321	ba,a,pt	%xcc, rtrap
322
323	/* Memory Address Unaligned.  */
324sun4v_mna:
325	/* Window fixup? */
326	rdpr	%tl, %g2
327	cmp	%g2, 1
328	ble,pt	%icc, 1f
329	 nop
330
331	SET_GL(1)
332	ldxa	[%g0] ASI_SCRATCHPAD, %g2
333	ldx	[%g2 + HV_FAULT_D_ADDR_OFFSET], %g5
334	mov	HV_FAULT_TYPE_UNALIGNED, %g3
335	ldx	[%g2 + HV_FAULT_D_CTX_OFFSET], %g4
336	sllx	%g3, 16, %g3
337	or	%g4, %g3, %g4
338	ba,pt	%xcc, winfix_mna
339	 rdpr	%tpc, %g3
340	/* not reached */
341
3421:	ldxa	[%g0] ASI_SCRATCHPAD, %g2
343	mov	HV_FAULT_TYPE_UNALIGNED, %g3
344	ldx	[%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
345	ldx	[%g2 + HV_FAULT_D_CTX_OFFSET], %g5
346	sllx	%g3, 16, %g3
347	or	%g5, %g3, %g5
348
349	ba,pt	%xcc, etrap
350	 rd	%pc, %g7
351	mov	%l4, %o1
352	mov	%l5, %o2
353	call	sun4v_do_mna
354	 add	%sp, PTREGS_OFF, %o0
355	ba,a,pt	%xcc, rtrap
356	 nop
357
358	/* Privileged Action.  */
359sun4v_privact:
360	ba,pt	%xcc, etrap
361	 rd	%pc, %g7
362	call	do_privact
363	 add	%sp, PTREGS_OFF, %o0
364	ba,a,pt	%xcc, rtrap
365
366	/* Unaligned ldd float, tl0. */
367sun4v_lddfmna:
368	ldxa	[%g0] ASI_SCRATCHPAD, %g2
369	ldx	[%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
370	ldx	[%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
371	ldx	[%g2 + HV_FAULT_D_CTX_OFFSET], %g5
372	sllx	%g3, 16, %g3
373	or	%g5, %g3, %g5
374	ba,pt	%xcc, etrap
375	 rd	%pc, %g7
376	mov	%l4, %o1
377	mov	%l5, %o2
378	call	handle_lddfmna
379	 add	%sp, PTREGS_OFF, %o0
380	ba,a,pt	%xcc, rtrap
381
382	/* Unaligned std float, tl0. */
383sun4v_stdfmna:
384	ldxa	[%g0] ASI_SCRATCHPAD, %g2
385	ldx	[%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
386	ldx	[%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
387	ldx	[%g2 + HV_FAULT_D_CTX_OFFSET], %g5
388	sllx	%g3, 16, %g3
389	or	%g5, %g3, %g5
390	ba,pt	%xcc, etrap
391	 rd	%pc, %g7
392	mov	%l4, %o1
393	mov	%l5, %o2
394	call	handle_stdfmna
395	 add	%sp, PTREGS_OFF, %o0
396	ba,a,pt	%xcc, rtrap
397
398#define BRANCH_ALWAYS	0x10680000
399#define NOP		0x01000000
400#define SUN4V_DO_PATCH(OLD, NEW)	\
401	sethi	%hi(NEW), %g1; \
402	or	%g1, %lo(NEW), %g1; \
403	sethi	%hi(OLD), %g2; \
404	or	%g2, %lo(OLD), %g2; \
405	sub	%g1, %g2, %g1; \
406	sethi	%hi(BRANCH_ALWAYS), %g3; \
407	sll	%g1, 11, %g1; \
408	srl	%g1, 11 + 2, %g1; \
409	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
410	or	%g3, %g1, %g3; \
411	stw	%g3, [%g2]; \
412	sethi	%hi(NOP), %g3; \
413	or	%g3, %lo(NOP), %g3; \
414	stw	%g3, [%g2 + 0x4]; \
415	flush	%g2;
416
417	.globl	sun4v_patch_tlb_handlers
418	.type	sun4v_patch_tlb_handlers,#function
419sun4v_patch_tlb_handlers:
420	SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss)
421	SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss)
422	SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss)
423	SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss)
424	SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot)
425	SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot)
426	SUN4V_DO_PATCH(tl0_iax, sun4v_iacc)
427	SUN4V_DO_PATCH(tl1_iax, sun4v_iacc_tl1)
428	SUN4V_DO_PATCH(tl0_dax, sun4v_dacc)
429	SUN4V_DO_PATCH(tl1_dax, sun4v_dacc_tl1)
430	SUN4V_DO_PATCH(tl0_mna, sun4v_mna)
431	SUN4V_DO_PATCH(tl1_mna, sun4v_mna)
432	SUN4V_DO_PATCH(tl0_lddfmna, sun4v_lddfmna)
433	SUN4V_DO_PATCH(tl0_stdfmna, sun4v_stdfmna)
434	SUN4V_DO_PATCH(tl0_privact, sun4v_privact)
435	retl
436	 nop
437	.size	sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers
438