1 /* SPDX-License-Identifier: GPL-2.0 */
3 * trampoline.S: Jump start slave processors on sparc64.
5 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
9 #include <linux/pgtable.h>
15 #include <asm/pstate.h>
17 #include <asm/spitfire.h>
18 #include <asm/processor.h>
19 #include <asm/thread_info.h>
21 #include <asm/hypervisor.h>
22 #include <asm/cpudata.h>
30 .asciz "SUNW,itlb-load"
33 .asciz "SUNW,dtlb-load"
35 #define TRAMP_STACK_SIZE 1024
38 .skip TRAMP_STACK_SIZE
41 .globl sparc64_cpu_startup, sparc64_cpu_startup_end
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)
47 ba,pt %xcc, spitfire_startup
51 /* Preserve OBP chosen DCU and DCR register settings. */
52 ba,pt %xcc, cheetah_generic_startup
56 mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
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
62 or %g5, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g5
63 stxa %g5, [%g0] ASI_DCU_CONTROL_REG
67 cheetah_generic_startup:
68 mov TSB_EXTENSION_P, %g3
69 stxa %g0, [%g3] ASI_DMMU
70 stxa %g0, [%g3] ASI_IMMU
73 mov TSB_EXTENSION_S, %g3
74 stxa %g0, [%g3] ASI_DMMU
77 mov TSB_EXTENSION_N, %g3
78 stxa %g0, [%g3] ASI_DMMU
79 stxa %g0, [%g3] ASI_IMMU
84 /* Disable STICK_INT interrupts. */
85 sethi %hi(0x80000000), %g5
89 ba,pt %xcc, startup_continue
93 mov (LSU_CONTROL_IC | LSU_CONTROL_DC | LSU_CONTROL_IM | LSU_CONTROL_DM), %g1
94 stxa %g1, [%g0] ASI_LSU_CONTROL
99 BRANCH_IF_SUN4V(g1, niagara_lock_tlb)
101 sethi %hi(0x80000000), %g2
103 wr %g2, 0, %tick_cmpr
105 /* Call OBP by hand to lock KERNBASE into i/d tlbs.
106 * We lock 'num_kernel_image_mappings' consequetive entries.
108 sethi %hi(prom_entry_lock), %g2
109 1: ldstub [%g2 + %lo(prom_entry_lock)], %g1
113 /* Get onto temporary stack which will be in the locked
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
122 /* Setup the loop variables:
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
129 sethi %hi(KERNBASE), %l3
130 sethi %hi(kern_locked_tte_data), %l4
131 ldx [%l4 + %lo(kern_locked_tte_data)], %l4
133 sethi %hi(num_kernel_image_mappings), %l6
134 lduw [%l6 + %lo(num_kernel_image_mappings)], %l6
137 BRANCH_IF_ANY_CHEETAH(g1,g5,2f)
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]
148 stx %g2, [%sp + 2047 + 128 + 0x08]
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]
158 /* Each TTE maps 4MB, convert index to offset. */
162 stx %g2, [%sp + 2047 + 128 + 0x28] ! VADDR
164 stx %g2, [%sp + 2047 + 128 + 0x30] ! TTE
166 /* TTE index is highest minus loop index. */
168 stx %g2, [%sp + 2047 + 128 + 0x38]
170 sethi %hi(p1275buf), %g2
171 or %g2, %lo(p1275buf), %g2
172 ldx [%g2 + 0x08], %o1
174 add %sp, (2047 + 128), %o0
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]
181 stx %g2, [%sp + 2047 + 128 + 0x08]
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]
191 /* Each TTE maps 4MB, convert index to offset. */
195 stx %g2, [%sp + 2047 + 128 + 0x28] ! VADDR
197 stx %g2, [%sp + 2047 + 128 + 0x30] ! TTE
199 /* TTE index is highest minus loop index. */
201 stx %g2, [%sp + 2047 + 128 + 0x38]
203 sethi %hi(p1275buf), %g2
204 or %g2, %lo(p1275buf), %g2
205 ldx [%g2 + 0x08], %o1
207 add %sp, (2047 + 128), %o0
214 sethi %hi(prom_entry_lock), %g2
215 stb %g0, [%g2 + %lo(prom_entry_lock)]
217 ba,pt %xcc, after_lock_tlb
221 sethi %hi(KERNBASE), %l3
222 sethi %hi(kern_locked_tte_data), %l4
223 ldx [%l4 + %lo(kern_locked_tte_data)], %l4
225 sethi %hi(num_kernel_image_mappings), %l6
226 lduw [%l6 + %lo(num_kernel_image_mappings)], %l6
229 mov HV_FAST_MMU_MAP_PERM_ADDR, %o5
237 mov HV_FAST_MMU_MAP_PERM_ADDR, %o5
251 wrpr %g0, (PSTATE_PRIV | PSTATE_PEF), %pstate
256 mov PRIMARY_CONTEXT, %g7
258 661: stxa %g0, [%g7] ASI_DMMU
259 .section .sun4v_1insn_patch, "ax"
261 stxa %g0, [%g7] ASI_MMU
265 mov SECONDARY_CONTEXT, %g7
267 661: stxa %g0, [%g7] ASI_DMMU
268 .section .sun4v_1insn_patch, "ax"
270 stxa %g0, [%g7] ASI_MMU
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.
282 * Get onto temporary stack which is in the locked kernel image.
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
290 /* Put garbage in these registers to trap any access to them. */
295 call init_irqwork_curcpu
298 sethi %hi(tlb_type), %g3
299 lduw [%g3 + %lo(tlb_type)], %g2
304 call hard_smp_processor_id
307 call sun4v_register_mondo_queues
310 1: call init_cur_cpu_trap
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
318 661: stxa %g2, [%g1] ASI_DMMU
319 .section .sun4v_1insn_patch, "ax"
321 stxa %g2, [%g1] ASI_MMU
328 sethi %hi(prom_entry_lock), %g2
329 1: ldstub [%g2 + %lo(prom_entry_lock)], %g1
333 /* As a hack, put &init_thread_union into %g6.
334 * prom_world() loads from here to restore the %asi
337 sethi %hi(init_thread_union), %g6
338 or %g6, %lo(init_thread_union), %g6
340 sethi %hi(is_sun4v), %o0
341 lduw [%o0 + %lo(is_sun4v)], %o0
345 TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
346 add %g2, TRAP_PER_CPU_FAULT_INFO, %g2
347 stxa %g2, [%g0] ASI_SCRATCHPAD
349 /* Compute physical address:
351 * paddr = kern_base + (mmfsa_vaddr - KERNBASE)
353 sethi %hi(KERNBASE), %g3
355 sethi %hi(kern_base), %g3
356 ldx [%g3 + %lo(kern_base)], %g3
358 sethi %hi(sparc64_ttable_tl0), %o0
360 set prom_set_trap_table_name, %g2
361 stx %g2, [%sp + 2047 + 128 + 0x00]
363 stx %g2, [%sp + 2047 + 128 + 0x08]
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
372 add %sp, (2047 + 128), %o0
377 2: sethi %hi(sparc64_ttable_tl0), %o0
378 set prom_set_trap_table_name, %g2
379 stx %g2, [%sp + 2047 + 128 + 0x00]
381 stx %g2, [%sp + 2047 + 128 + 0x08]
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
389 add %sp, (2047 + 128), %o0
391 3: sethi %hi(prom_entry_lock), %g2
392 stb %g0, [%g2 + %lo(prom_entry_lock)]
395 ldx [%g6 + TI_TASK], %g4
398 sllx %g5, THREAD_SHIFT, %g5
399 sub %g5, (STACKFRAME_SZ + STACK_BIAS), %g5
403 or %o1, PSTATE_IE, %o1
414 sparc64_cpu_startup_end: