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1da177e4 LT |
1 | /* $Id: head.S,v 1.87 2002/02/09 19:49:31 davem Exp $ |
2 | * head.S: Initial boot code for the Sparc64 port of Linux. | |
3 | * | |
4 | * Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au) | |
6 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx) | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/version.h> |
11 | #include <linux/errno.h> | |
951bc82c | 12 | #include <linux/threads.h> |
1da177e4 LT |
13 | #include <asm/thread_info.h> |
14 | #include <asm/asi.h> | |
15 | #include <asm/pstate.h> | |
16 | #include <asm/ptrace.h> | |
17 | #include <asm/spitfire.h> | |
18 | #include <asm/page.h> | |
19 | #include <asm/pgtable.h> | |
20 | #include <asm/errno.h> | |
21 | #include <asm/signal.h> | |
22 | #include <asm/processor.h> | |
23 | #include <asm/lsu.h> | |
24 | #include <asm/dcr.h> | |
25 | #include <asm/dcu.h> | |
26 | #include <asm/head.h> | |
27 | #include <asm/ttable.h> | |
28 | #include <asm/mmu.h> | |
56fb4df6 | 29 | #include <asm/cpudata.h> |
1da177e4 LT |
30 | |
31 | /* This section from from _start to sparc64_boot_end should fit into | |
c9c10830 | 32 | * 0x0000000000404000 to 0x0000000000408000. |
1da177e4 | 33 | */ |
1da177e4 LT |
34 | .text |
35 | .globl start, _start, stext, _stext | |
36 | _start: | |
37 | start: | |
38 | _stext: | |
39 | stext: | |
1da177e4 LT |
40 | ! 0x0000000000404000 |
41 | b sparc64_boot | |
42 | flushw /* Flush register file. */ | |
43 | ||
44 | /* This stuff has to be in sync with SILO and other potential boot loaders | |
45 | * Fields should be kept upward compatible and whenever any change is made, | |
46 | * HdrS version should be incremented. | |
47 | */ | |
48 | .global root_flags, ram_flags, root_dev | |
49 | .global sparc_ramdisk_image, sparc_ramdisk_size | |
50 | .global sparc_ramdisk_image64 | |
51 | ||
52 | .ascii "HdrS" | |
53 | .word LINUX_VERSION_CODE | |
54 | ||
55 | /* History: | |
56 | * | |
57 | * 0x0300 : Supports being located at other than 0x4000 | |
58 | * 0x0202 : Supports kernel params string | |
59 | * 0x0201 : Supports reboot_command | |
60 | */ | |
61 | .half 0x0301 /* HdrS version */ | |
62 | ||
63 | root_flags: | |
64 | .half 1 | |
65 | root_dev: | |
66 | .half 0 | |
67 | ram_flags: | |
68 | .half 0 | |
69 | sparc_ramdisk_image: | |
70 | .word 0 | |
71 | sparc_ramdisk_size: | |
72 | .word 0 | |
73 | .xword reboot_command | |
74 | .xword bootstr_info | |
75 | sparc_ramdisk_image64: | |
76 | .xword 0 | |
77 | .word _end | |
78 | ||
bff06d55 DM |
79 | /* PROM cif handler code address is in %o4. */ |
80 | sparc64_boot: | |
15f14834 | 81 | mov %o4, %l7 |
bff06d55 DM |
82 | |
83 | /* We need to remap the kernel. Use position independant | |
84 | * code to remap us to KERNBASE. | |
1da177e4 | 85 | * |
bff06d55 DM |
86 | * SILO can invoke us with 32-bit address masking enabled, |
87 | * so make sure that's clear. | |
1da177e4 | 88 | */ |
bff06d55 DM |
89 | rdpr %pstate, %g1 |
90 | andn %g1, PSTATE_AM, %g1 | |
91 | wrpr %g1, 0x0, %pstate | |
92 | ba,a,pt %xcc, 1f | |
93 | ||
d82ace7d DM |
94 | .globl prom_finddev_name, prom_chosen_path, prom_root_node |
95 | .globl prom_getprop_name, prom_mmu_name, prom_peer_name | |
96 | .globl prom_callmethod_name, prom_translate_name, prom_root_compatible | |
bff06d55 DM |
97 | .globl prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache |
98 | .globl prom_boot_mapped_pc, prom_boot_mapping_mode | |
99 | .globl prom_boot_mapping_phys_high, prom_boot_mapping_phys_low | |
d82ace7d DM |
100 | .globl is_sun4v |
101 | prom_peer_name: | |
102 | .asciz "peer" | |
103 | prom_compatible_name: | |
104 | .asciz "compatible" | |
bff06d55 DM |
105 | prom_finddev_name: |
106 | .asciz "finddevice" | |
107 | prom_chosen_path: | |
108 | .asciz "/chosen" | |
109 | prom_getprop_name: | |
110 | .asciz "getprop" | |
111 | prom_mmu_name: | |
112 | .asciz "mmu" | |
113 | prom_callmethod_name: | |
114 | .asciz "call-method" | |
115 | prom_translate_name: | |
116 | .asciz "translate" | |
117 | prom_map_name: | |
118 | .asciz "map" | |
119 | prom_unmap_name: | |
120 | .asciz "unmap" | |
d82ace7d | 121 | prom_sun4v_name: |
6cebb520 | 122 | .asciz "sun4v" |
bff06d55 | 123 | .align 4 |
d82ace7d DM |
124 | prom_root_compatible: |
125 | .skip 64 | |
126 | prom_root_node: | |
127 | .word 0 | |
bff06d55 DM |
128 | prom_mmu_ihandle_cache: |
129 | .word 0 | |
130 | prom_boot_mapped_pc: | |
131 | .word 0 | |
132 | prom_boot_mapping_mode: | |
133 | .word 0 | |
134 | .align 8 | |
135 | prom_boot_mapping_phys_high: | |
136 | .xword 0 | |
137 | prom_boot_mapping_phys_low: | |
138 | .xword 0 | |
d82ace7d DM |
139 | is_sun4v: |
140 | .word 0 | |
bff06d55 DM |
141 | 1: |
142 | rd %pc, %l0 | |
d82ace7d DM |
143 | |
144 | mov (1b - prom_peer_name), %l1 | |
145 | sub %l0, %l1, %l1 | |
146 | mov 0, %l2 | |
147 | ||
148 | /* prom_root_node = prom_peer(0) */ | |
149 | stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "peer" | |
150 | mov 1, %l3 | |
151 | stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1 | |
152 | stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1 | |
153 | stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, 0 | |
154 | stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1 | |
155 | call %l7 | |
156 | add %sp, (2047 + 128), %o0 ! argument array | |
157 | ||
158 | ldx [%sp + 2047 + 128 + 0x20], %l4 ! prom root node | |
159 | mov (1b - prom_root_node), %l1 | |
160 | sub %l0, %l1, %l1 | |
161 | stw %l4, [%l1] | |
162 | ||
163 | mov (1b - prom_getprop_name), %l1 | |
164 | mov (1b - prom_compatible_name), %l2 | |
165 | mov (1b - prom_root_compatible), %l5 | |
166 | sub %l0, %l1, %l1 | |
167 | sub %l0, %l2, %l2 | |
168 | sub %l0, %l5, %l5 | |
169 | ||
170 | /* prom_getproperty(prom_root_node, "compatible", | |
171 | * &prom_root_compatible, 64) | |
172 | */ | |
173 | stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop" | |
174 | mov 4, %l3 | |
175 | stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4 | |
176 | mov 1, %l3 | |
177 | stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1 | |
178 | stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, prom_root_node | |
179 | stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible" | |
180 | stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_root_compatible | |
181 | mov 64, %l3 | |
182 | stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size | |
183 | stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1 | |
184 | call %l7 | |
185 | add %sp, (2047 + 128), %o0 ! argument array | |
186 | ||
bff06d55 DM |
187 | mov (1b - prom_finddev_name), %l1 |
188 | mov (1b - prom_chosen_path), %l2 | |
189 | mov (1b - prom_boot_mapped_pc), %l3 | |
190 | sub %l0, %l1, %l1 | |
191 | sub %l0, %l2, %l2 | |
192 | sub %l0, %l3, %l3 | |
193 | stw %l0, [%l3] | |
194 | sub %sp, (192 + 128), %sp | |
195 | ||
196 | /* chosen_node = prom_finddevice("/chosen") */ | |
197 | stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice" | |
198 | mov 1, %l3 | |
199 | stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1 | |
200 | stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1 | |
201 | stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/chosen" | |
202 | stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1 | |
203 | call %l7 | |
204 | add %sp, (2047 + 128), %o0 ! argument array | |
205 | ||
206 | ldx [%sp + 2047 + 128 + 0x20], %l4 ! chosen device node | |
207 | ||
208 | mov (1b - prom_getprop_name), %l1 | |
209 | mov (1b - prom_mmu_name), %l2 | |
210 | mov (1b - prom_mmu_ihandle_cache), %l5 | |
211 | sub %l0, %l1, %l1 | |
212 | sub %l0, %l2, %l2 | |
213 | sub %l0, %l5, %l5 | |
214 | ||
215 | /* prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu") */ | |
216 | stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop" | |
217 | mov 4, %l3 | |
218 | stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4 | |
219 | mov 1, %l3 | |
220 | stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1 | |
221 | stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, chosen_node | |
222 | stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "mmu" | |
223 | stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_mmu_ihandle_cache | |
224 | mov 4, %l3 | |
225 | stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, sizeof(arg3) | |
226 | stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1 | |
227 | call %l7 | |
228 | add %sp, (2047 + 128), %o0 ! argument array | |
229 | ||
230 | mov (1b - prom_callmethod_name), %l1 | |
231 | mov (1b - prom_translate_name), %l2 | |
232 | sub %l0, %l1, %l1 | |
233 | sub %l0, %l2, %l2 | |
234 | lduw [%l5], %l5 ! prom_mmu_ihandle_cache | |
235 | ||
236 | stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "call-method" | |
237 | mov 3, %l3 | |
238 | stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 3 | |
239 | mov 5, %l3 | |
240 | stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 5 | |
241 | stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1: "translate" | |
242 | stx %l5, [%sp + 2047 + 128 + 0x20] ! arg2: prom_mmu_ihandle_cache | |
b1b510aa DM |
243 | /* PAGE align */ |
244 | srlx %l0, 13, %l3 | |
245 | sllx %l3, 13, %l3 | |
bff06d55 DM |
246 | stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: vaddr, our PC |
247 | stx %g0, [%sp + 2047 + 128 + 0x30] ! res1 | |
248 | stx %g0, [%sp + 2047 + 128 + 0x38] ! res2 | |
249 | stx %g0, [%sp + 2047 + 128 + 0x40] ! res3 | |
250 | stx %g0, [%sp + 2047 + 128 + 0x48] ! res4 | |
251 | stx %g0, [%sp + 2047 + 128 + 0x50] ! res5 | |
252 | call %l7 | |
253 | add %sp, (2047 + 128), %o0 ! argument array | |
254 | ||
255 | ldx [%sp + 2047 + 128 + 0x40], %l1 ! translation mode | |
256 | mov (1b - prom_boot_mapping_mode), %l4 | |
257 | sub %l0, %l4, %l4 | |
258 | stw %l1, [%l4] | |
259 | mov (1b - prom_boot_mapping_phys_high), %l4 | |
260 | sub %l0, %l4, %l4 | |
261 | ldx [%sp + 2047 + 128 + 0x48], %l2 ! physaddr high | |
262 | stx %l2, [%l4 + 0x0] | |
263 | ldx [%sp + 2047 + 128 + 0x50], %l3 ! physaddr low | |
b1b510aa DM |
264 | /* 4MB align */ |
265 | srlx %l3, 22, %l3 | |
266 | sllx %l3, 22, %l3 | |
bff06d55 DM |
267 | stx %l3, [%l4 + 0x8] |
268 | ||
269 | /* Leave service as-is, "call-method" */ | |
270 | mov 7, %l3 | |
271 | stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 7 | |
272 | mov 1, %l3 | |
a8201c61 | 273 | stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1 |
bff06d55 DM |
274 | mov (1b - prom_map_name), %l3 |
275 | sub %l0, %l3, %l3 | |
276 | stx %l3, [%sp + 2047 + 128 + 0x18] ! arg1: "map" | |
277 | /* Leave arg2 as-is, prom_mmu_ihandle_cache */ | |
278 | mov -1, %l3 | |
279 | stx %l3, [%sp + 2047 + 128 + 0x28] ! arg3: mode (-1 default) | |
280 | sethi %hi(8 * 1024 * 1024), %l3 | |
281 | stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4: size (8MB) | |
282 | sethi %hi(KERNBASE), %l3 | |
283 | stx %l3, [%sp + 2047 + 128 + 0x38] ! arg5: vaddr (KERNBASE) | |
284 | stx %g0, [%sp + 2047 + 128 + 0x40] ! arg6: empty | |
285 | mov (1b - prom_boot_mapping_phys_low), %l3 | |
286 | sub %l0, %l3, %l3 | |
287 | ldx [%l3], %l3 | |
288 | stx %l3, [%sp + 2047 + 128 + 0x48] ! arg7: phys addr | |
289 | call %l7 | |
290 | add %sp, (2047 + 128), %o0 ! argument array | |
291 | ||
292 | add %sp, (192 + 128), %sp | |
293 | ||
d82ace7d DM |
294 | sethi %hi(prom_root_compatible), %g1 |
295 | or %g1, %lo(prom_root_compatible), %g1 | |
296 | sethi %hi(prom_sun4v_name), %g7 | |
297 | or %g7, %lo(prom_sun4v_name), %g7 | |
6cebb520 | 298 | mov 5, %g3 |
d82ace7d DM |
299 | 1: ldub [%g7], %g2 |
300 | ldub [%g1], %g4 | |
301 | cmp %g2, %g4 | |
302 | bne,pn %icc, 2f | |
303 | add %g7, 1, %g7 | |
304 | subcc %g3, 1, %g3 | |
305 | bne,pt %xcc, 1b | |
306 | add %g1, 1, %g1 | |
307 | ||
308 | sethi %hi(is_sun4v), %g1 | |
309 | or %g1, %lo(is_sun4v), %g1 | |
310 | mov 1, %g7 | |
311 | stw %g7, [%g1] | |
312 | ||
313 | 2: | |
314 | BRANCH_IF_SUN4V(g1, jump_to_sun4u_init) | |
1da177e4 LT |
315 | BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot) |
316 | BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot) | |
317 | ba,pt %xcc, spitfire_boot | |
318 | nop | |
319 | ||
320 | cheetah_plus_boot: | |
321 | /* Preserve OBP chosen DCU and DCR register settings. */ | |
322 | ba,pt %xcc, cheetah_generic_boot | |
323 | nop | |
324 | ||
325 | cheetah_boot: | |
326 | mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1 | |
327 | wr %g1, %asr18 | |
328 | ||
329 | sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7 | |
330 | or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7 | |
331 | sllx %g7, 32, %g7 | |
332 | or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7 | |
333 | stxa %g7, [%g0] ASI_DCU_CONTROL_REG | |
334 | membar #Sync | |
335 | ||
336 | cheetah_generic_boot: | |
337 | mov TSB_EXTENSION_P, %g3 | |
338 | stxa %g0, [%g3] ASI_DMMU | |
339 | stxa %g0, [%g3] ASI_IMMU | |
340 | membar #Sync | |
341 | ||
342 | mov TSB_EXTENSION_S, %g3 | |
343 | stxa %g0, [%g3] ASI_DMMU | |
344 | membar #Sync | |
345 | ||
346 | mov TSB_EXTENSION_N, %g3 | |
347 | stxa %g0, [%g3] ASI_DMMU | |
348 | stxa %g0, [%g3] ASI_IMMU | |
349 | membar #Sync | |
350 | ||
bff06d55 | 351 | ba,a,pt %xcc, jump_to_sun4u_init |
1da177e4 LT |
352 | |
353 | spitfire_boot: | |
354 | /* Typically PROM has already enabled both MMU's and both on-chip | |
355 | * caches, but we do it here anyway just to be paranoid. | |
356 | */ | |
357 | mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1 | |
358 | stxa %g1, [%g0] ASI_LSU_CONTROL | |
359 | membar #Sync | |
360 | ||
bff06d55 | 361 | jump_to_sun4u_init: |
1da177e4 LT |
362 | /* |
363 | * Make sure we are in privileged mode, have address masking, | |
364 | * using the ordinary globals and have enabled floating | |
365 | * point. | |
366 | * | |
367 | * Again, typically PROM has left %pil at 13 or similar, and | |
368 | * (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate. | |
369 | */ | |
370 | wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate | |
371 | wr %g0, 0, %fprs | |
372 | ||
1da177e4 LT |
373 | set sun4u_init, %g2 |
374 | jmpl %g2 + %g0, %g0 | |
375 | nop | |
376 | ||
377 | sun4u_init: | |
6cebb520 DM |
378 | BRANCH_IF_SUN4V(g1, sun4v_init) |
379 | ||
1da177e4 | 380 | /* Set ctx 0 */ |
8b11bd12 | 381 | mov PRIMARY_CONTEXT, %g7 |
6cebb520 | 382 | stxa %g0, [%g7] ASI_DMMU |
8b11bd12 DM |
383 | membar #Sync |
384 | ||
385 | mov SECONDARY_CONTEXT, %g7 | |
6cebb520 DM |
386 | stxa %g0, [%g7] ASI_DMMU |
387 | membar #Sync | |
388 | ||
389 | ba,pt %xcc, sun4u_continue | |
390 | nop | |
8b11bd12 | 391 | |
6cebb520 DM |
392 | sun4v_init: |
393 | /* Set ctx 0 */ | |
394 | mov PRIMARY_CONTEXT, %g7 | |
8b11bd12 | 395 | stxa %g0, [%g7] ASI_MMU |
6cebb520 | 396 | membar #Sync |
1da177e4 | 397 | |
6cebb520 DM |
398 | mov SECONDARY_CONTEXT, %g7 |
399 | stxa %g0, [%g7] ASI_MMU | |
400 | membar #Sync | |
401 | ba,pt %xcc, niagara_tlb_fixup | |
402 | nop | |
1da177e4 | 403 | |
6cebb520 | 404 | sun4u_continue: |
d82ace7d | 405 | BRANCH_IF_ANY_CHEETAH(g1, g7, cheetah_tlb_fixup) |
1da177e4 LT |
406 | |
407 | ba,pt %xcc, spitfire_tlb_fixup | |
408 | nop | |
409 | ||
8591e302 DM |
410 | niagara_tlb_fixup: |
411 | mov 3, %g2 /* Set TLB type to hypervisor. */ | |
412 | sethi %hi(tlb_type), %g1 | |
413 | stw %g2, [%g1 + %lo(tlb_type)] | |
414 | ||
415 | /* Patch copy/clear ops. */ | |
416 | call niagara_patch_copyops | |
417 | nop | |
8ca2557c DM |
418 | call niagara_patch_bzero |
419 | nop | |
8591e302 DM |
420 | call niagara_patch_pageops |
421 | nop | |
422 | ||
423 | /* Patch TLB/cache ops. */ | |
424 | call hypervisor_patch_cachetlbops | |
425 | nop | |
426 | ||
d82ace7d DM |
427 | ba,pt %xcc, tlb_fixup_done |
428 | nop | |
429 | ||
1da177e4 | 430 | cheetah_tlb_fixup: |
1da177e4 LT |
431 | mov 2, %g2 /* Set TLB type to cheetah+. */ |
432 | BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f) | |
433 | ||
434 | mov 1, %g2 /* Set TLB type to cheetah. */ | |
435 | ||
436 | 1: sethi %hi(tlb_type), %g1 | |
437 | stw %g2, [%g1 + %lo(tlb_type)] | |
438 | ||
0835ae0f | 439 | /* Patch copy/page operations to cheetah optimized versions. */ |
1da177e4 LT |
440 | call cheetah_patch_copyops |
441 | nop | |
dbd2fdf5 DM |
442 | call cheetah_patch_copy_page |
443 | nop | |
1da177e4 LT |
444 | call cheetah_patch_cachetlbops |
445 | nop | |
446 | ||
447 | ba,pt %xcc, tlb_fixup_done | |
448 | nop | |
449 | ||
450 | spitfire_tlb_fixup: | |
1da177e4 LT |
451 | /* Set TLB type to spitfire. */ |
452 | mov 0, %g2 | |
453 | sethi %hi(tlb_type), %g1 | |
454 | stw %g2, [%g1 + %lo(tlb_type)] | |
455 | ||
456 | tlb_fixup_done: | |
457 | sethi %hi(init_thread_union), %g6 | |
458 | or %g6, %lo(init_thread_union), %g6 | |
459 | ldx [%g6 + TI_TASK], %g4 | |
460 | mov %sp, %l6 | |
1da177e4 | 461 | |
1da177e4 LT |
462 | wr %g0, ASI_P, %asi |
463 | mov 1, %g1 | |
464 | sllx %g1, THREAD_SHIFT, %g1 | |
465 | sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1 | |
466 | add %g6, %g1, %sp | |
467 | mov 0, %fp | |
468 | ||
469 | /* Set per-cpu pointer initially to zero, this makes | |
470 | * the boot-cpu use the in-kernel-image per-cpu areas | |
471 | * before setup_per_cpu_area() is invoked. | |
472 | */ | |
473 | clr %g5 | |
474 | ||
475 | wrpr %g0, 0, %wstate | |
476 | wrpr %g0, 0x0, %tl | |
477 | ||
478 | /* Clear the bss */ | |
479 | sethi %hi(__bss_start), %o0 | |
480 | or %o0, %lo(__bss_start), %o0 | |
481 | sethi %hi(_end), %o1 | |
482 | or %o1, %lo(_end), %o1 | |
483 | call __bzero | |
484 | sub %o1, %o0, %o1 | |
485 | ||
10e26723 DM |
486 | #ifdef CONFIG_LOCKDEP |
487 | /* We have this call this super early, as even prom_init can grab | |
488 | * spinlocks and thus call into the lockdep code. | |
489 | */ | |
490 | call lockdep_init | |
491 | nop | |
492 | #endif | |
493 | ||
1da177e4 LT |
494 | mov %l6, %o1 ! OpenPROM stack |
495 | call prom_init | |
496 | mov %l7, %o0 ! OpenPROM cif handler | |
497 | ||
951bc82c DM |
498 | /* Initialize current_thread_info()->cpu as early as possible. |
499 | * In order to do that accurately we have to patch up the get_cpuid() | |
500 | * assembler sequences. And that, in turn, requires that we know | |
501 | * if we are on a Starfire box or not. While we're here, patch up | |
502 | * the sun4v sequences as well. | |
503 | */ | |
504 | call check_if_starfire | |
505 | nop | |
506 | call per_cpu_patch | |
507 | nop | |
508 | call sun4v_patch | |
509 | nop | |
510 | ||
511 | #ifdef CONFIG_SMP | |
512 | call hard_smp_processor_id | |
513 | nop | |
514 | cmp %o0, NR_CPUS | |
515 | blu,pt %xcc, 1f | |
516 | nop | |
517 | call boot_cpu_id_too_large | |
518 | nop | |
519 | /* Not reached... */ | |
520 | ||
521 | 1: | |
522 | #else | |
523 | mov 0, %o0 | |
524 | #endif | |
22adb358 | 525 | sth %o0, [%g6 + TI_CPU] |
951bc82c | 526 | |
1da177e4 LT |
527 | /* Off we go.... */ |
528 | call start_kernel | |
529 | nop | |
530 | /* Not reached... */ | |
531 | ||
5d8e1b18 DM |
532 | /* This is meant to allow the sharing of this code between |
533 | * boot processor invocation (via setup_tba() below) and | |
534 | * secondary processor startup (via trampoline.S). The | |
535 | * former does use this code, the latter does not yet due | |
536 | * to some complexities. That should be fixed up at some | |
537 | * point. | |
c9c10830 DM |
538 | * |
539 | * There used to be enormous complexity wrt. transferring | |
540 | * over from the firwmare's trap table to the Linux kernel's. | |
541 | * For example, there was a chicken & egg problem wrt. building | |
542 | * the OBP page tables, yet needing to be on the Linux kernel | |
543 | * trap table (to translate PAGE_OFFSET addresses) in order to | |
544 | * do that. | |
545 | * | |
546 | * We now handle OBP tlb misses differently, via linear lookups | |
547 | * into the prom_trans[] array. So that specific problem no | |
548 | * longer exists. Yet, unfortunately there are still some issues | |
549 | * preventing trampoline.S from using this code... ho hum. | |
5d8e1b18 DM |
550 | */ |
551 | .globl setup_trap_table | |
552 | setup_trap_table: | |
553 | save %sp, -192, %sp | |
554 | ||
c9c10830 | 555 | /* Force interrupts to be disabled. */ |
d8573e20 DM |
556 | rdpr %pstate, %l0 |
557 | andn %l0, PSTATE_IE, %o1 | |
5d8e1b18 | 558 | wrpr %o1, 0x0, %pstate |
d8573e20 | 559 | rdpr %pil, %l1 |
5d8e1b18 | 560 | wrpr %g0, 15, %pil |
1da177e4 | 561 | |
c9c10830 | 562 | /* Make the firmware call to jump over to the Linux trap table. */ |
12eaa328 DM |
563 | sethi %hi(is_sun4v), %o0 |
564 | lduw [%o0 + %lo(is_sun4v)], %o0 | |
565 | brz,pt %o0, 1f | |
566 | nop | |
567 | ||
568 | TRAP_LOAD_TRAP_BLOCK(%g2, %g3) | |
569 | add %g2, TRAP_PER_CPU_FAULT_INFO, %g2 | |
570 | stxa %g2, [%g0] ASI_SCRATCHPAD | |
571 | ||
572 | /* Compute physical address: | |
573 | * | |
574 | * paddr = kern_base + (mmfsa_vaddr - KERNBASE) | |
575 | */ | |
576 | sethi %hi(KERNBASE), %g3 | |
577 | sub %g2, %g3, %g2 | |
578 | sethi %hi(kern_base), %g3 | |
579 | ldx [%g3 + %lo(kern_base)], %g3 | |
580 | add %g2, %g3, %o1 | |
581 | ||
582 | call prom_set_trap_table_sun4v | |
583 | sethi %hi(sparc64_ttable_tl0), %o0 | |
584 | ||
585 | ba,pt %xcc, 2f | |
586 | nop | |
587 | ||
588 | 1: call prom_set_trap_table | |
5d8e1b18 DM |
589 | sethi %hi(sparc64_ttable_tl0), %o0 |
590 | ||
591 | /* Start using proper page size encodings in ctx register. */ | |
12eaa328 | 592 | 2: sethi %hi(sparc64_kern_pri_context), %g3 |
5d8e1b18 | 593 | ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2 |
8b11bd12 DM |
594 | |
595 | mov PRIMARY_CONTEXT, %g1 | |
596 | ||
597 | 661: stxa %g2, [%g1] ASI_DMMU | |
598 | .section .sun4v_1insn_patch, "ax" | |
599 | .word 661b | |
600 | stxa %g2, [%g1] ASI_MMU | |
601 | .previous | |
602 | ||
5d8e1b18 DM |
603 | membar #Sync |
604 | ||
1da177e4 LT |
605 | /* Kill PROM timer */ |
606 | sethi %hi(0x80000000), %o2 | |
607 | sllx %o2, 32, %o2 | |
608 | wr %o2, 0, %tick_cmpr | |
609 | ||
d82ace7d DM |
610 | BRANCH_IF_SUN4V(o2, 1f) |
611 | BRANCH_IF_ANY_CHEETAH(o2, o3, 1f) | |
1da177e4 LT |
612 | |
613 | ba,pt %xcc, 2f | |
614 | nop | |
615 | ||
616 | /* Disable STICK_INT interrupts. */ | |
617 | 1: | |
618 | sethi %hi(0x80000000), %o2 | |
619 | sllx %o2, 32, %o2 | |
620 | wr %o2, %asr25 | |
621 | ||
1da177e4 LT |
622 | 2: |
623 | wrpr %g0, %g0, %wstate | |
1da177e4 LT |
624 | |
625 | call init_irqwork_curcpu | |
626 | nop | |
627 | ||
d8573e20 DM |
628 | /* Now we can restore interrupt state. */ |
629 | wrpr %l0, 0, %pstate | |
630 | wrpr %l1, 0x0, %pil | |
5d8e1b18 DM |
631 | |
632 | ret | |
633 | restore | |
634 | ||
635 | .globl setup_tba | |
a8b900d8 | 636 | setup_tba: |
5d8e1b18 DM |
637 | save %sp, -192, %sp |
638 | ||
639 | /* The boot processor is the only cpu which invokes this | |
640 | * routine, the other cpus set things up via trampoline.S. | |
641 | * So save the OBP trap table address here. | |
642 | */ | |
643 | rdpr %tba, %g7 | |
644 | sethi %hi(prom_tba), %o1 | |
645 | or %o1, %lo(prom_tba), %o1 | |
646 | stx %g7, [%o1] | |
647 | ||
648 | call setup_trap_table | |
649 | nop | |
1da177e4 LT |
650 | |
651 | ret | |
652 | restore | |
c9c10830 DM |
653 | sparc64_boot_end: |
654 | ||
c9c10830 DM |
655 | #include "etrap.S" |
656 | #include "rtrap.S" | |
657 | #include "winfixup.S" | |
658 | #include "entry.S" | |
5b0c0572 DM |
659 | #include "sun4v_tlb_miss.S" |
660 | #include "sun4v_ivec.S" | |
2d9e2763 DM |
661 | #include "ktlb.S" |
662 | #include "tsb.S" | |
1da177e4 LT |
663 | |
664 | /* | |
c9c10830 | 665 | * The following skip makes sure the trap table in ttable.S is aligned |
1da177e4 | 666 | * on a 32K boundary as required by the v9 specs for TBA register. |
2f7ee7c6 DM |
667 | * |
668 | * We align to a 32K boundary, then we have the 32K kernel TSB, | |
2d9e2763 | 669 | * the 64K kernel 4MB TSB, and then the 32K aligned trap table. |
1da177e4 | 670 | */ |
c9c10830 DM |
671 | 1: |
672 | .skip 0x4000 + _start - 1b | |
1da177e4 | 673 | |
2d9e2763 DM |
674 | ! 0x0000000000408000 |
675 | ||
2f7ee7c6 DM |
676 | .globl swapper_tsb |
677 | swapper_tsb: | |
678 | .skip (32 * 1024) | |
1da177e4 | 679 | |
2d9e2763 DM |
680 | .globl swapper_4m_tsb |
681 | swapper_4m_tsb: | |
682 | .skip (64 * 1024) | |
683 | ||
684 | ! 0x0000000000420000 | |
1da177e4 | 685 | |
2d9e2763 DM |
686 | /* Some care needs to be exercised if you try to move the |
687 | * location of the trap table relative to other things. For | |
688 | * one thing there are br* instructions in some of the | |
689 | * trap table entires which branch back to code in ktlb.S | |
690 | * Those instructions can only handle a signed 16-bit | |
691 | * displacement. | |
692 | * | |
693 | * There is a binutils bug (bugzilla #4558) which causes | |
694 | * the relocation overflow checks for such instructions to | |
695 | * not be done correctly. So bintuils will not notice the | |
696 | * error and will instead write junk into the relocation and | |
697 | * you'll have an unbootable kernel. | |
698 | */ | |
1da177e4 | 699 | #include "ttable.S" |
1da177e4 | 700 | |
2d9e2763 DM |
701 | ! 0x0000000000428000 |
702 | ||
074d82cf DM |
703 | #include "systbls.S" |
704 | ||
1da177e4 LT |
705 | .data |
706 | .align 8 | |
707 | .globl prom_tba, tlb_type | |
708 | prom_tba: .xword 0 | |
709 | tlb_type: .word 0 /* Must NOT end up in BSS */ | |
710 | .section ".fixup",#alloc,#execinstr | |
5fd29752 DM |
711 | |
712 | .globl __ret_efault, __retl_efault | |
1da177e4 LT |
713 | __ret_efault: |
714 | ret | |
715 | restore %g0, -EFAULT, %o0 | |
5fd29752 DM |
716 | __retl_efault: |
717 | retl | |
718 | mov -EFAULT, %o0 |