1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * trampoline.S: Jump start slave processors on sparc64.
4 *
5 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8
9#include <linux/pgtable.h>
10#include <asm/head.h>
11#include <asm/asi.h>
12#include <asm/lsu.h>
13#include <asm/dcr.h>
14#include <asm/dcu.h>
15#include <asm/pstate.h>
16#include <asm/page.h>
17#include <asm/spitfire.h>
18#include <asm/processor.h>
19#include <asm/thread_info.h>
20#include <asm/mmu.h>
21#include <asm/hypervisor.h>
22#include <asm/cpudata.h>
23
24	.data
25	.align	8
26call_method:
27	.asciz	"call-method"
28	.align	8
29itlb_load:
30	.asciz	"SUNW,itlb-load"
31	.align	8
32dtlb_load:
33	.asciz	"SUNW,dtlb-load"
34
35#define TRAMP_STACK_SIZE	1024
36	.align	16
37tramp_stack:
38	.skip	TRAMP_STACK_SIZE
39
40	.align		8
41	.globl		sparc64_cpu_startup, sparc64_cpu_startup_end
42sparc64_cpu_startup:
43	BRANCH_IF_SUN4V(g1, niagara_startup)
44	BRANCH_IF_CHEETAH_BASE(g1, g5, cheetah_startup)
45	BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1, g5, cheetah_plus_startup)
46
47	ba,pt	%xcc, spitfire_startup
48	 nop
49
50cheetah_plus_startup:
51	/* Preserve OBP chosen DCU and DCR register settings.  */
52	ba,pt	%xcc, cheetah_generic_startup
53	 nop
54
55cheetah_startup:
56	mov	DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
57	wr	%g1, %asr18
58
59	sethi	%uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g5
60	or	%g5, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g5
61	sllx	%g5, 32, %g5
62	or	%g5, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g5
63	stxa	%g5, [%g0] ASI_DCU_CONTROL_REG
64	membar	#Sync
65	/* fallthru */
66
67cheetah_generic_startup:
68	mov	TSB_EXTENSION_P, %g3
69	stxa	%g0, [%g3] ASI_DMMU
70	stxa	%g0, [%g3] ASI_IMMU
71	membar	#Sync
72
73	mov	TSB_EXTENSION_S, %g3
74	stxa	%g0, [%g3] ASI_DMMU
75	membar	#Sync
76
77	mov	TSB_EXTENSION_N, %g3
78	stxa	%g0, [%g3] ASI_DMMU
79	stxa	%g0, [%g3] ASI_IMMU
80	membar	#Sync
81	/* fallthru */
82
83niagara_startup:
84	/* Disable STICK_INT interrupts. */
85	sethi		%hi(0x80000000), %g5
86	sllx		%g5, 32, %g5
87	wr		%g5, %asr25
88
89	ba,pt		%xcc, startup_continue
90	 nop
91
92spitfire_startup:
93	mov		(LSU_CONTROL_IC | LSU_CONTROL_DC | LSU_CONTROL_IM | LSU_CONTROL_DM), %g1
94	stxa		%g1, [%g0] ASI_LSU_CONTROL
95	membar		#Sync
96
97startup_continue:
98	mov		%o0, %l0
99	BRANCH_IF_SUN4V(g1, niagara_lock_tlb)
100
101	sethi		%hi(0x80000000), %g2
102	sllx		%g2, 32, %g2
103	wr		%g2, 0, %tick_cmpr
104
105	/* Call OBP by hand to lock KERNBASE into i/d tlbs.
106	 * We lock 'num_kernel_image_mappings' consequetive entries.
107	 */
108	sethi		%hi(prom_entry_lock), %g2
1091:	ldstub		[%g2 + %lo(prom_entry_lock)], %g1
110	brnz,pn		%g1, 1b
111	 nop
112
113	/* Get onto temporary stack which will be in the locked
114	 * kernel image.
115	 */
116	sethi		%hi(tramp_stack), %g1
117	or		%g1, %lo(tramp_stack), %g1
118	add		%g1, TRAMP_STACK_SIZE, %g1
119	sub		%g1, STACKFRAME_SZ + STACK_BIAS + 256, %sp
120	flushw
121
122	/* Setup the loop variables:
123	 * %l3: VADDR base
124	 * %l4: TTE base
125	 * %l5: Loop iterator, iterates from 0 to 'num_kernel_image_mappings'
126	 * %l6: Number of TTE entries to map
127	 * %l7: Highest TTE entry number, we count down
128	 */
129	sethi		%hi(KERNBASE), %l3
130	sethi		%hi(kern_locked_tte_data), %l4
131	ldx		[%l4 + %lo(kern_locked_tte_data)], %l4
132	clr		%l5
133	sethi		%hi(num_kernel_image_mappings), %l6
134	lduw		[%l6 + %lo(num_kernel_image_mappings)], %l6
135
136	mov		15, %l7
137	BRANCH_IF_ANY_CHEETAH(g1,g5,2f)
138
139	mov		63, %l7
1402:
141
1423:
143	/* Lock into I-MMU */
144	sethi		%hi(call_method), %g2
145	or		%g2, %lo(call_method), %g2
146	stx		%g2, [%sp + 2047 + 128 + 0x00]
147	mov		5, %g2
148	stx		%g2, [%sp + 2047 + 128 + 0x08]
149	mov		1, %g2
150	stx		%g2, [%sp + 2047 + 128 + 0x10]
151	sethi		%hi(itlb_load), %g2
152	or		%g2, %lo(itlb_load), %g2
153	stx		%g2, [%sp + 2047 + 128 + 0x18]
154	sethi		%hi(prom_mmu_ihandle_cache), %g2
155	lduw		[%g2 + %lo(prom_mmu_ihandle_cache)], %g2
156	stx		%g2, [%sp + 2047 + 128 + 0x20]
157
158	/* Each TTE maps 4MB, convert index to offset.  */
159	sllx		%l5, 22, %g1
160
161	add		%l3, %g1, %g2
162	stx		%g2, [%sp + 2047 + 128 + 0x28]	! VADDR
163	add		%l4, %g1, %g2
164	stx		%g2, [%sp + 2047 + 128 + 0x30]	! TTE
165
166	/* TTE index is highest minus loop index.  */
167	sub		%l7, %l5, %g2
168	stx		%g2, [%sp + 2047 + 128 + 0x38]
169
170	sethi		%hi(p1275buf), %g2
171	or		%g2, %lo(p1275buf), %g2
172	ldx		[%g2 + 0x08], %o1
173	call		%o1
174	 add		%sp, (2047 + 128), %o0
175
176	/* Lock into D-MMU */
177	sethi		%hi(call_method), %g2
178	or		%g2, %lo(call_method), %g2
179	stx		%g2, [%sp + 2047 + 128 + 0x00]
180	mov		5, %g2
181	stx		%g2, [%sp + 2047 + 128 + 0x08]
182	mov		1, %g2
183	stx		%g2, [%sp + 2047 + 128 + 0x10]
184	sethi		%hi(dtlb_load), %g2
185	or		%g2, %lo(dtlb_load), %g2
186	stx		%g2, [%sp + 2047 + 128 + 0x18]
187	sethi		%hi(prom_mmu_ihandle_cache), %g2
188	lduw		[%g2 + %lo(prom_mmu_ihandle_cache)], %g2
189	stx		%g2, [%sp + 2047 + 128 + 0x20]
190
191	/* Each TTE maps 4MB, convert index to offset.  */
192	sllx		%l5, 22, %g1
193
194	add		%l3, %g1, %g2
195	stx		%g2, [%sp + 2047 + 128 + 0x28]	! VADDR
196	add		%l4, %g1, %g2
197	stx		%g2, [%sp + 2047 + 128 + 0x30]	! TTE
198
199	/* TTE index is highest minus loop index.  */
200	sub		%l7, %l5, %g2
201	stx		%g2, [%sp + 2047 + 128 + 0x38]
202
203	sethi		%hi(p1275buf), %g2
204	or		%g2, %lo(p1275buf), %g2
205	ldx		[%g2 + 0x08], %o1
206	call		%o1
207	 add		%sp, (2047 + 128), %o0
208
209	add		%l5, 1, %l5
210	cmp		%l5, %l6
211	bne,pt		%xcc, 3b
212	 nop
213
214	sethi		%hi(prom_entry_lock), %g2
215	stb		%g0, [%g2 + %lo(prom_entry_lock)]
216
217	ba,pt		%xcc, after_lock_tlb
218	 nop
219
220niagara_lock_tlb:
221	sethi		%hi(KERNBASE), %l3
222	sethi		%hi(kern_locked_tte_data), %l4
223	ldx		[%l4 + %lo(kern_locked_tte_data)], %l4
224	clr		%l5
225	sethi		%hi(num_kernel_image_mappings), %l6
226	lduw		[%l6 + %lo(num_kernel_image_mappings)], %l6
227
2281:
229	mov		HV_FAST_MMU_MAP_PERM_ADDR, %o5
230	sllx		%l5, 22, %g2
231	add		%l3, %g2, %o0
232	clr		%o1
233	add		%l4, %g2, %o2
234	mov		HV_MMU_IMMU, %o3
235	ta		HV_FAST_TRAP
236
237	mov		HV_FAST_MMU_MAP_PERM_ADDR, %o5
238	sllx		%l5, 22, %g2
239	add		%l3, %g2, %o0
240	clr		%o1
241	add		%l4, %g2, %o2
242	mov		HV_MMU_DMMU, %o3
243	ta		HV_FAST_TRAP
244
245	add		%l5, 1, %l5
246	cmp		%l5, %l6
247	bne,pt		%xcc, 1b
248	 nop
249
250after_lock_tlb:
251	wrpr		%g0, (PSTATE_PRIV | PSTATE_PEF), %pstate
252	wr		%g0, 0, %fprs
253
254	wr		%g0, ASI_P, %asi
255
256	mov		PRIMARY_CONTEXT, %g7
257
258661:	stxa		%g0, [%g7] ASI_DMMU
259	.section	.sun4v_1insn_patch, "ax"
260	.word		661b
261	stxa		%g0, [%g7] ASI_MMU
262	.previous
263
264	membar		#Sync
265	mov		SECONDARY_CONTEXT, %g7
266
267661:	stxa		%g0, [%g7] ASI_DMMU
268	.section	.sun4v_1insn_patch, "ax"
269	.word		661b
270	stxa		%g0, [%g7] ASI_MMU
271	.previous
272
273	membar		#Sync
274
275	/* Everything we do here, until we properly take over the
276	 * trap table, must be done with extreme care.  We cannot
277	 * make any references to %g6 (current thread pointer),
278	 * %g4 (current task pointer), or %g5 (base of current cpu's
279	 * per-cpu area) until we properly take over the trap table
280	 * from the firmware and hypervisor.
281	 *
282	 * Get onto temporary stack which is in the locked kernel image.
283	 */
284	sethi		%hi(tramp_stack), %g1
285	or		%g1, %lo(tramp_stack), %g1
286	add		%g1, TRAMP_STACK_SIZE, %g1
287	sub		%g1, STACKFRAME_SZ + STACK_BIAS + 256, %sp
288	mov		0, %fp
289
290	/* Put garbage in these registers to trap any access to them.  */
291	set		0xdeadbeef, %g4
292	set		0xdeadbeef, %g5
293	set		0xdeadbeef, %g6
294
295	call		init_irqwork_curcpu
296	 nop
297
298	sethi		%hi(tlb_type), %g3
299	lduw		[%g3 + %lo(tlb_type)], %g2
300	cmp		%g2, 3
301	bne,pt		%icc, 1f
302	 nop
303
304	call		hard_smp_processor_id
305	 nop
306
307	call		sun4v_register_mondo_queues
308	 nop
309
3101:	call		init_cur_cpu_trap
311	 ldx		[%l0], %o0
312
313	/* Start using proper page size encodings in ctx register.  */
314	sethi		%hi(sparc64_kern_pri_context), %g3
315	ldx		[%g3 + %lo(sparc64_kern_pri_context)], %g2
316	mov		PRIMARY_CONTEXT, %g1
317
318661:	stxa		%g2, [%g1] ASI_DMMU
319	.section	.sun4v_1insn_patch, "ax"
320	.word		661b
321	stxa		%g2, [%g1] ASI_MMU
322	.previous
323
324	membar		#Sync
325
326	wrpr		%g0, 0, %wstate
327
328	sethi		%hi(prom_entry_lock), %g2
3291:	ldstub		[%g2 + %lo(prom_entry_lock)], %g1
330	brnz,pn		%g1, 1b
331	 nop
332
333	/* As a hack, put &init_thread_union into %g6.
334	 * prom_world() loads from here to restore the %asi
335	 * register.
336	 */
337	sethi		%hi(init_thread_union), %g6
338	or		%g6, %lo(init_thread_union), %g6
339
340	sethi		%hi(is_sun4v), %o0
341	lduw		[%o0 + %lo(is_sun4v)], %o0
342	brz,pt		%o0, 2f
343	 nop
344
345	TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
346	add		%g2, TRAP_PER_CPU_FAULT_INFO, %g2
347	stxa		%g2, [%g0] ASI_SCRATCHPAD
348
349	/* Compute physical address:
350	 *
351	 * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
352	 */
353	sethi		%hi(KERNBASE), %g3
354	sub		%g2, %g3, %g2
355	sethi		%hi(kern_base), %g3
356	ldx		[%g3 + %lo(kern_base)], %g3
357	add		%g2, %g3, %o1
358	sethi		%hi(sparc64_ttable_tl0), %o0
359
360	set		prom_set_trap_table_name, %g2
361	stx		%g2, [%sp + 2047 + 128 + 0x00]
362	mov		2, %g2
363	stx		%g2, [%sp + 2047 + 128 + 0x08]
364	mov		0, %g2
365	stx		%g2, [%sp + 2047 + 128 + 0x10]
366	stx		%o0, [%sp + 2047 + 128 + 0x18]
367	stx		%o1, [%sp + 2047 + 128 + 0x20]
368	sethi		%hi(p1275buf), %g2
369	or		%g2, %lo(p1275buf), %g2
370	ldx		[%g2 + 0x08], %o1
371	call		%o1
372	 add		%sp, (2047 + 128), %o0
373
374	ba,pt		%xcc, 3f
375	 nop
376
3772:	sethi		%hi(sparc64_ttable_tl0), %o0
378	set		prom_set_trap_table_name, %g2
379	stx		%g2, [%sp + 2047 + 128 + 0x00]
380	mov		1, %g2
381	stx		%g2, [%sp + 2047 + 128 + 0x08]
382	mov		0, %g2
383	stx		%g2, [%sp + 2047 + 128 + 0x10]
384	stx		%o0, [%sp + 2047 + 128 + 0x18]
385	sethi		%hi(p1275buf), %g2
386	or		%g2, %lo(p1275buf), %g2
387	ldx		[%g2 + 0x08], %o1
388	call		%o1
389	 add		%sp, (2047 + 128), %o0
390
3913:	sethi		%hi(prom_entry_lock), %g2
392	stb		%g0, [%g2 + %lo(prom_entry_lock)]
393
394	ldx		[%l0], %g6
395	ldx		[%g6 + TI_TASK], %g4
396
397	mov		1, %g5
398	sllx		%g5, THREAD_SHIFT, %g5
399	sub		%g5, (STACKFRAME_SZ + STACK_BIAS), %g5
400	add		%g6, %g5, %sp
401
402	rdpr		%pstate, %o1
403	or		%o1, PSTATE_IE, %o1
404	wrpr		%o1, 0, %pstate
405
406	call		smp_callin
407	 nop
408
409	call		cpu_panic
410	 nop
4111:	b,a,pt		%xcc, 1b
412
413	.align		8
414sparc64_cpu_startup_end:
415