Commit | Line | Data |
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40ef8cbc PM |
1 | /* |
2 | * | |
3 | * Common boot and setup code. | |
4 | * | |
5 | * Copyright (C) 2001 PPC64 Team, IBM Corp | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #undef DEBUG | |
14 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/reboot.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/initrd.h> | |
24 | #include <linux/ide.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/ioport.h> | |
27 | #include <linux/console.h> | |
28 | #include <linux/utsname.h> | |
29 | #include <linux/tty.h> | |
30 | #include <linux/root_dev.h> | |
31 | #include <linux/notifier.h> | |
32 | #include <linux/cpu.h> | |
33 | #include <linux/unistd.h> | |
34 | #include <linux/serial.h> | |
35 | #include <linux/serial_8250.h> | |
36 | #include <asm/io.h> | |
0cc4746c | 37 | #include <asm/kdump.h> |
40ef8cbc PM |
38 | #include <asm/prom.h> |
39 | #include <asm/processor.h> | |
40 | #include <asm/pgtable.h> | |
40ef8cbc PM |
41 | #include <asm/smp.h> |
42 | #include <asm/elf.h> | |
43 | #include <asm/machdep.h> | |
44 | #include <asm/paca.h> | |
40ef8cbc PM |
45 | #include <asm/time.h> |
46 | #include <asm/cputable.h> | |
47 | #include <asm/sections.h> | |
48 | #include <asm/btext.h> | |
49 | #include <asm/nvram.h> | |
50 | #include <asm/setup.h> | |
51 | #include <asm/system.h> | |
52 | #include <asm/rtas.h> | |
53 | #include <asm/iommu.h> | |
54 | #include <asm/serial.h> | |
55 | #include <asm/cache.h> | |
56 | #include <asm/page.h> | |
57 | #include <asm/mmu.h> | |
58 | #include <asm/lmb.h> | |
f218aab5 | 59 | #include <asm/iseries/it_lp_naca.h> |
40ef8cbc | 60 | #include <asm/firmware.h> |
f78541dc | 61 | #include <asm/xmon.h> |
dcad47fc | 62 | #include <asm/udbg.h> |
593e537b | 63 | #include <asm/kexec.h> |
40ef8cbc | 64 | |
66ba135c SR |
65 | #include "setup.h" |
66 | ||
40ef8cbc PM |
67 | #ifdef DEBUG |
68 | #define DBG(fmt...) udbg_printf(fmt) | |
69 | #else | |
70 | #define DBG(fmt...) | |
71 | #endif | |
72 | ||
73 | /* | |
74 | * Here are some early debugging facilities. You can enable one | |
75 | * but your kernel will not boot on anything else if you do so | |
76 | */ | |
77 | ||
78 | /* This one is for use on LPAR machines that support an HVC console | |
79 | * on vterm 0 | |
80 | */ | |
81 | extern void udbg_init_debug_lpar(void); | |
82 | /* This one is for use on Apple G5 machines | |
83 | */ | |
84 | extern void udbg_init_pmac_realmode(void); | |
85 | /* That's RTAS panel debug */ | |
86 | extern void call_rtas_display_status_delay(unsigned char c); | |
87 | /* Here's maple real mode debug */ | |
88 | extern void udbg_init_maple_realmode(void); | |
89 | ||
90 | #define EARLY_DEBUG_INIT() do {} while(0) | |
91 | ||
92 | #if 0 | |
93 | #define EARLY_DEBUG_INIT() udbg_init_debug_lpar() | |
94 | #define EARLY_DEBUG_INIT() udbg_init_maple_realmode() | |
95 | #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode() | |
96 | #define EARLY_DEBUG_INIT() \ | |
97 | do { udbg_putc = call_rtas_display_status_delay; } while(0) | |
98 | #endif | |
99 | ||
40ef8cbc PM |
100 | int have_of = 1; |
101 | int boot_cpuid = 0; | |
102 | int boot_cpuid_phys = 0; | |
103 | dev_t boot_dev; | |
104 | u64 ppc64_pft_size; | |
105 | ||
dabcafd3 OJ |
106 | /* Pick defaults since we might want to patch instructions |
107 | * before we've read this from the device tree. | |
108 | */ | |
109 | struct ppc64_caches ppc64_caches = { | |
110 | .dline_size = 0x80, | |
111 | .log_dline_size = 7, | |
112 | .iline_size = 0x80, | |
113 | .log_iline_size = 7 | |
114 | }; | |
40ef8cbc PM |
115 | EXPORT_SYMBOL_GPL(ppc64_caches); |
116 | ||
117 | /* | |
118 | * These are used in binfmt_elf.c to put aux entries on the stack | |
119 | * for each elf executable being started. | |
120 | */ | |
121 | int dcache_bsize; | |
122 | int icache_bsize; | |
123 | int ucache_bsize; | |
124 | ||
125 | /* The main machine-dep calls structure | |
126 | */ | |
127 | struct machdep_calls ppc_md; | |
128 | EXPORT_SYMBOL(ppc_md); | |
129 | ||
130 | #ifdef CONFIG_MAGIC_SYSRQ | |
131 | unsigned long SYSRQ_KEY; | |
132 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
133 | ||
134 | ||
135 | static int ppc64_panic_event(struct notifier_block *, unsigned long, void *); | |
136 | static struct notifier_block ppc64_panic_block = { | |
137 | .notifier_call = ppc64_panic_event, | |
138 | .priority = INT_MIN /* may not return; must be done last */ | |
139 | }; | |
140 | ||
40ef8cbc PM |
141 | #ifdef CONFIG_SMP |
142 | ||
143 | static int smt_enabled_cmdline; | |
144 | ||
145 | /* Look for ibm,smt-enabled OF option */ | |
146 | static void check_smt_enabled(void) | |
147 | { | |
148 | struct device_node *dn; | |
149 | char *smt_option; | |
150 | ||
151 | /* Allow the command line to overrule the OF option */ | |
152 | if (smt_enabled_cmdline) | |
153 | return; | |
154 | ||
155 | dn = of_find_node_by_path("/options"); | |
156 | ||
157 | if (dn) { | |
158 | smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL); | |
159 | ||
160 | if (smt_option) { | |
161 | if (!strcmp(smt_option, "on")) | |
162 | smt_enabled_at_boot = 1; | |
163 | else if (!strcmp(smt_option, "off")) | |
164 | smt_enabled_at_boot = 0; | |
165 | } | |
166 | } | |
167 | } | |
168 | ||
169 | /* Look for smt-enabled= cmdline option */ | |
170 | static int __init early_smt_enabled(char *p) | |
171 | { | |
172 | smt_enabled_cmdline = 1; | |
173 | ||
174 | if (!p) | |
175 | return 0; | |
176 | ||
177 | if (!strcmp(p, "on") || !strcmp(p, "1")) | |
178 | smt_enabled_at_boot = 1; | |
179 | else if (!strcmp(p, "off") || !strcmp(p, "0")) | |
180 | smt_enabled_at_boot = 0; | |
181 | ||
182 | return 0; | |
183 | } | |
184 | early_param("smt-enabled", early_smt_enabled); | |
185 | ||
5ad57078 PM |
186 | #else |
187 | #define check_smt_enabled() | |
40ef8cbc PM |
188 | #endif /* CONFIG_SMP */ |
189 | ||
190 | extern struct machdep_calls pSeries_md; | |
191 | extern struct machdep_calls pmac_md; | |
192 | extern struct machdep_calls maple_md; | |
f3f66f59 | 193 | extern struct machdep_calls cell_md; |
40ef8cbc PM |
194 | extern struct machdep_calls iseries_md; |
195 | ||
196 | /* Ultimately, stuff them in an elf section like initcalls... */ | |
197 | static struct machdep_calls __initdata *machines[] = { | |
198 | #ifdef CONFIG_PPC_PSERIES | |
199 | &pSeries_md, | |
200 | #endif /* CONFIG_PPC_PSERIES */ | |
201 | #ifdef CONFIG_PPC_PMAC | |
202 | &pmac_md, | |
203 | #endif /* CONFIG_PPC_PMAC */ | |
204 | #ifdef CONFIG_PPC_MAPLE | |
205 | &maple_md, | |
206 | #endif /* CONFIG_PPC_MAPLE */ | |
f3f66f59 AB |
207 | #ifdef CONFIG_PPC_CELL |
208 | &cell_md, | |
40ef8cbc PM |
209 | #endif |
210 | #ifdef CONFIG_PPC_ISERIES | |
211 | &iseries_md, | |
212 | #endif | |
213 | NULL | |
214 | }; | |
215 | ||
216 | /* | |
217 | * Early initialization entry point. This is called by head.S | |
218 | * with MMU translation disabled. We rely on the "feature" of | |
219 | * the CPU that ignores the top 2 bits of the address in real | |
220 | * mode so we can access kernel globals normally provided we | |
221 | * only toy with things in the RMO region. From here, we do | |
222 | * some early parsing of the device-tree to setup out LMB | |
223 | * data structures, and allocate & initialize the hash table | |
224 | * and segment tables so we can start running with translation | |
225 | * enabled. | |
226 | * | |
227 | * It is this function which will call the probe() callback of | |
228 | * the various platform types and copy the matching one to the | |
229 | * global ppc_md structure. Your platform can eventually do | |
230 | * some very early initializations from the probe() routine, but | |
231 | * this is not recommended, be very careful as, for example, the | |
232 | * device-tree is not accessible via normal means at this point. | |
233 | */ | |
234 | ||
235 | void __init early_setup(unsigned long dt_ptr) | |
236 | { | |
237 | struct paca_struct *lpaca = get_paca(); | |
238 | static struct machdep_calls **mach; | |
239 | ||
240 | /* | |
241 | * Enable early debugging if any specified (see top of | |
242 | * this file) | |
243 | */ | |
244 | EARLY_DEBUG_INIT(); | |
245 | ||
246 | DBG(" -> early_setup()\n"); | |
247 | ||
40ef8cbc PM |
248 | /* |
249 | * Do early initializations using the flattened device | |
250 | * tree, like retreiving the physical memory map or | |
251 | * calculating/retreiving the hash table size | |
252 | */ | |
253 | early_init_devtree(__va(dt_ptr)); | |
254 | ||
255 | /* | |
256 | * Iterate all ppc_md structures until we find the proper | |
257 | * one for the current machine type | |
258 | */ | |
799d6046 | 259 | DBG("Probing machine type for platform %x...\n", _machine); |
40ef8cbc PM |
260 | |
261 | for (mach = machines; *mach; mach++) { | |
799d6046 | 262 | if ((*mach)->probe(_machine)) |
40ef8cbc PM |
263 | break; |
264 | } | |
265 | /* What can we do if we didn't find ? */ | |
266 | if (*mach == NULL) { | |
267 | DBG("No suitable machine found !\n"); | |
268 | for (;;); | |
269 | } | |
270 | ppc_md = **mach; | |
271 | ||
0cc4746c ME |
272 | #ifdef CONFIG_CRASH_DUMP |
273 | kdump_setup(); | |
274 | #endif | |
275 | ||
40ef8cbc PM |
276 | DBG("Found, Initializing memory management...\n"); |
277 | ||
278 | /* | |
3c726f8d BH |
279 | * Initialize the MMU Hash table and create the linear mapping |
280 | * of memory. Has to be done before stab/slb initialization as | |
281 | * this is currently where the page size encoding is obtained | |
40ef8cbc | 282 | */ |
3c726f8d | 283 | htab_initialize(); |
40ef8cbc PM |
284 | |
285 | /* | |
3c726f8d | 286 | * Initialize stab / SLB management except on iSeries |
40ef8cbc | 287 | */ |
3c726f8d BH |
288 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) { |
289 | if (cpu_has_feature(CPU_FTR_SLB)) | |
290 | slb_initialize(); | |
291 | else | |
292 | stab_initialize(lpaca->stab_real); | |
293 | } | |
40ef8cbc PM |
294 | |
295 | DBG(" <- early_setup()\n"); | |
296 | } | |
297 | ||
799d6046 PM |
298 | #ifdef CONFIG_SMP |
299 | void early_setup_secondary(void) | |
300 | { | |
301 | struct paca_struct *lpaca = get_paca(); | |
302 | ||
303 | /* Mark enabled in PACA */ | |
304 | lpaca->proc_enabled = 0; | |
305 | ||
306 | /* Initialize hash table for that CPU */ | |
307 | htab_initialize_secondary(); | |
308 | ||
309 | /* Initialize STAB/SLB. We use a virtual address as it works | |
310 | * in real mode on pSeries and we want a virutal address on | |
311 | * iSeries anyway | |
312 | */ | |
313 | if (cpu_has_feature(CPU_FTR_SLB)) | |
314 | slb_initialize(); | |
315 | else | |
316 | stab_initialize(lpaca->stab_addr); | |
317 | } | |
318 | ||
319 | #endif /* CONFIG_SMP */ | |
40ef8cbc | 320 | |
b8f51021 ME |
321 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
322 | void smp_release_cpus(void) | |
323 | { | |
324 | extern unsigned long __secondary_hold_spinloop; | |
325 | ||
326 | DBG(" -> smp_release_cpus()\n"); | |
327 | ||
328 | /* All secondary cpus are spinning on a common spinloop, release them | |
329 | * all now so they can start to spin on their individual paca | |
330 | * spinloops. For non SMP kernels, the secondary cpus never get out | |
331 | * of the common spinloop. | |
332 | * This is useless but harmless on iSeries, secondaries are already | |
333 | * waiting on their paca spinloops. */ | |
334 | ||
335 | __secondary_hold_spinloop = 1; | |
336 | mb(); | |
337 | ||
338 | DBG(" <- smp_release_cpus()\n"); | |
339 | } | |
5ad57078 PM |
340 | #else |
341 | #define smp_release_cpus() | |
b8f51021 ME |
342 | #endif /* CONFIG_SMP || CONFIG_KEXEC */ |
343 | ||
40ef8cbc | 344 | /* |
799d6046 PM |
345 | * Initialize some remaining members of the ppc64_caches and systemcfg |
346 | * structures | |
40ef8cbc PM |
347 | * (at least until we get rid of them completely). This is mostly some |
348 | * cache informations about the CPU that will be used by cache flush | |
349 | * routines and/or provided to userland | |
350 | */ | |
351 | static void __init initialize_cache_info(void) | |
352 | { | |
353 | struct device_node *np; | |
354 | unsigned long num_cpus = 0; | |
355 | ||
356 | DBG(" -> initialize_cache_info()\n"); | |
357 | ||
358 | for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { | |
359 | num_cpus += 1; | |
360 | ||
361 | /* We're assuming *all* of the CPUs have the same | |
362 | * d-cache and i-cache sizes... -Peter | |
363 | */ | |
364 | ||
365 | if ( num_cpus == 1 ) { | |
366 | u32 *sizep, *lsizep; | |
367 | u32 size, lsize; | |
368 | const char *dc, *ic; | |
369 | ||
370 | /* Then read cache informations */ | |
799d6046 | 371 | if (_machine == PLATFORM_POWERMAC) { |
40ef8cbc PM |
372 | dc = "d-cache-block-size"; |
373 | ic = "i-cache-block-size"; | |
374 | } else { | |
375 | dc = "d-cache-line-size"; | |
376 | ic = "i-cache-line-size"; | |
377 | } | |
378 | ||
379 | size = 0; | |
380 | lsize = cur_cpu_spec->dcache_bsize; | |
381 | sizep = (u32 *)get_property(np, "d-cache-size", NULL); | |
382 | if (sizep != NULL) | |
383 | size = *sizep; | |
384 | lsizep = (u32 *) get_property(np, dc, NULL); | |
385 | if (lsizep != NULL) | |
386 | lsize = *lsizep; | |
387 | if (sizep == 0 || lsizep == 0) | |
388 | DBG("Argh, can't find dcache properties ! " | |
389 | "sizep: %p, lsizep: %p\n", sizep, lsizep); | |
390 | ||
a7f290da BH |
391 | ppc64_caches.dsize = size; |
392 | ppc64_caches.dline_size = lsize; | |
40ef8cbc PM |
393 | ppc64_caches.log_dline_size = __ilog2(lsize); |
394 | ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; | |
395 | ||
396 | size = 0; | |
397 | lsize = cur_cpu_spec->icache_bsize; | |
398 | sizep = (u32 *)get_property(np, "i-cache-size", NULL); | |
399 | if (sizep != NULL) | |
400 | size = *sizep; | |
401 | lsizep = (u32 *)get_property(np, ic, NULL); | |
402 | if (lsizep != NULL) | |
403 | lsize = *lsizep; | |
404 | if (sizep == 0 || lsizep == 0) | |
405 | DBG("Argh, can't find icache properties ! " | |
406 | "sizep: %p, lsizep: %p\n", sizep, lsizep); | |
407 | ||
a7f290da BH |
408 | ppc64_caches.isize = size; |
409 | ppc64_caches.iline_size = lsize; | |
40ef8cbc PM |
410 | ppc64_caches.log_iline_size = __ilog2(lsize); |
411 | ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; | |
412 | } | |
413 | } | |
414 | ||
40ef8cbc PM |
415 | DBG(" <- initialize_cache_info()\n"); |
416 | } | |
417 | ||
40ef8cbc PM |
418 | |
419 | /* | |
420 | * Do some initial setup of the system. The parameters are those which | |
421 | * were passed in from the bootloader. | |
422 | */ | |
423 | void __init setup_system(void) | |
424 | { | |
425 | DBG(" -> setup_system()\n"); | |
426 | ||
427 | /* | |
428 | * Unflatten the device-tree passed by prom_init or kexec | |
429 | */ | |
430 | unflatten_device_tree(); | |
431 | ||
593e537b ME |
432 | #ifdef CONFIG_KEXEC |
433 | kexec_setup(); /* requires unflattened device tree. */ | |
434 | #endif | |
435 | ||
40ef8cbc PM |
436 | /* |
437 | * Fill the ppc64_caches & systemcfg structures with informations | |
438 | * retreived from the device-tree. Need to be called before | |
439 | * finish_device_tree() since the later requires some of the | |
440 | * informations filled up here to properly parse the interrupt | |
441 | * tree. | |
442 | * It also sets up the cache line sizes which allows to call | |
443 | * routines like flush_icache_range (used by the hash init | |
444 | * later on). | |
445 | */ | |
446 | initialize_cache_info(); | |
447 | ||
448 | #ifdef CONFIG_PPC_RTAS | |
449 | /* | |
450 | * Initialize RTAS if available | |
451 | */ | |
452 | rtas_initialize(); | |
453 | #endif /* CONFIG_PPC_RTAS */ | |
40ef8cbc PM |
454 | |
455 | /* | |
456 | * Check if we have an initrd provided via the device-tree | |
457 | */ | |
458 | check_for_initrd(); | |
40ef8cbc PM |
459 | |
460 | /* | |
461 | * Do some platform specific early initializations, that includes | |
462 | * setting up the hash table pointers. It also sets up some interrupt-mapping | |
463 | * related options that will be used by finish_device_tree() | |
464 | */ | |
465 | ppc_md.init_early(); | |
40ef8cbc | 466 | |
463ce0e1 BH |
467 | /* |
468 | * We can discover serial ports now since the above did setup the | |
469 | * hash table management for us, thus ioremap works. We do that early | |
470 | * so that further code can be debugged | |
471 | */ | |
472 | #ifdef CONFIG_PPC_MULTIPLATFORM | |
473 | find_legacy_serial_ports(); | |
474 | #endif | |
475 | ||
40ef8cbc PM |
476 | /* |
477 | * "Finish" the device-tree, that is do the actual parsing of | |
478 | * some of the properties like the interrupt map | |
479 | */ | |
480 | finish_device_tree(); | |
40ef8cbc PM |
481 | |
482 | /* | |
483 | * Initialize xmon | |
484 | */ | |
485 | #ifdef CONFIG_XMON_DEFAULT | |
486 | xmon_init(1); | |
487 | #endif | |
40ef8cbc PM |
488 | /* |
489 | * Register early console | |
490 | */ | |
491 | register_early_udbg_console(); | |
40ef8cbc PM |
492 | |
493 | /* Save unparsed command line copy for /proc/cmdline */ | |
494 | strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); | |
495 | ||
496 | parse_early_param(); | |
40ef8cbc | 497 | |
5ad57078 PM |
498 | check_smt_enabled(); |
499 | smp_setup_cpu_maps(); | |
40ef8cbc PM |
500 | |
501 | /* Release secondary cpus out of their spinloops at 0x60 now that | |
502 | * we can map physical -> logical CPU ids | |
503 | */ | |
504 | smp_release_cpus(); | |
40ef8cbc PM |
505 | |
506 | printk("Starting Linux PPC64 %s\n", system_utsname.version); | |
507 | ||
508 | printk("-----------------------------------------------------\n"); | |
509 | printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size); | |
a7f290da BH |
510 | printk("ppc64_interrupt_controller = 0x%ld\n", |
511 | ppc64_interrupt_controller); | |
512 | printk("platform = 0x%x\n", _machine); | |
513 | printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size()); | |
40ef8cbc | 514 | printk("ppc64_caches.dcache_line_size = 0x%x\n", |
a7f290da | 515 | ppc64_caches.dline_size); |
40ef8cbc | 516 | printk("ppc64_caches.icache_line_size = 0x%x\n", |
a7f290da | 517 | ppc64_caches.iline_size); |
40ef8cbc PM |
518 | printk("htab_address = 0x%p\n", htab_address); |
519 | printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); | |
398ab1fc ME |
520 | #if PHYSICAL_START > 0 |
521 | printk("physical_start = 0x%x\n", PHYSICAL_START); | |
522 | #endif | |
40ef8cbc | 523 | printk("-----------------------------------------------------\n"); |
40ef8cbc PM |
524 | |
525 | mm_init_ppc64(); | |
40ef8cbc PM |
526 | |
527 | DBG(" <- setup_system()\n"); | |
528 | } | |
529 | ||
40ef8cbc PM |
530 | static int ppc64_panic_event(struct notifier_block *this, |
531 | unsigned long event, void *ptr) | |
532 | { | |
533 | ppc_md.panic((char *)ptr); /* May not return */ | |
534 | return NOTIFY_DONE; | |
535 | } | |
536 | ||
40ef8cbc PM |
537 | #ifdef CONFIG_IRQSTACKS |
538 | static void __init irqstack_early_init(void) | |
539 | { | |
540 | unsigned int i; | |
541 | ||
542 | /* | |
543 | * interrupt stacks must be under 256MB, we cannot afford to take | |
544 | * SLB misses on them. | |
545 | */ | |
546 | for_each_cpu(i) { | |
3c726f8d BH |
547 | softirq_ctx[i] = (struct thread_info *) |
548 | __va(lmb_alloc_base(THREAD_SIZE, | |
549 | THREAD_SIZE, 0x10000000)); | |
550 | hardirq_ctx[i] = (struct thread_info *) | |
551 | __va(lmb_alloc_base(THREAD_SIZE, | |
552 | THREAD_SIZE, 0x10000000)); | |
40ef8cbc PM |
553 | } |
554 | } | |
555 | #else | |
556 | #define irqstack_early_init() | |
557 | #endif | |
558 | ||
559 | /* | |
560 | * Stack space used when we detect a bad kernel stack pointer, and | |
561 | * early in SMP boots before relocation is enabled. | |
562 | */ | |
563 | static void __init emergency_stack_init(void) | |
564 | { | |
565 | unsigned long limit; | |
566 | unsigned int i; | |
567 | ||
568 | /* | |
569 | * Emergency stacks must be under 256MB, we cannot afford to take | |
570 | * SLB misses on them. The ABI also requires them to be 128-byte | |
571 | * aligned. | |
572 | * | |
573 | * Since we use these as temporary stacks during secondary CPU | |
574 | * bringup, we need to get at them in real mode. This means they | |
575 | * must also be within the RMO region. | |
576 | */ | |
577 | limit = min(0x10000000UL, lmb.rmo_size); | |
578 | ||
579 | for_each_cpu(i) | |
3c726f8d BH |
580 | paca[i].emergency_sp = |
581 | __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE; | |
40ef8cbc PM |
582 | } |
583 | ||
40ef8cbc PM |
584 | /* |
585 | * Called into from start_kernel, after lock_kernel has been called. | |
586 | * Initializes bootmem, which is unsed to manage page allocation until | |
587 | * mem_init is called. | |
588 | */ | |
589 | void __init setup_arch(char **cmdline_p) | |
590 | { | |
591 | extern void do_init_bootmem(void); | |
592 | ||
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593 | ppc64_boot_msg(0x12, "Setup Arch"); |
594 | ||
595 | *cmdline_p = cmd_line; | |
596 | ||
597 | /* | |
598 | * Set cache line size based on type of cpu as a default. | |
599 | * Systems with OF can look in the properties on the cpu node(s) | |
600 | * for a possibly more accurate value. | |
601 | */ | |
602 | dcache_bsize = ppc64_caches.dline_size; | |
603 | icache_bsize = ppc64_caches.iline_size; | |
604 | ||
605 | /* reboot on panic */ | |
606 | panic_timeout = 180; | |
40ef8cbc PM |
607 | |
608 | if (ppc_md.panic) | |
609 | notifier_chain_register(&panic_notifier_list, &ppc64_panic_block); | |
610 | ||
611 | init_mm.start_code = PAGE_OFFSET; | |
612 | init_mm.end_code = (unsigned long) _etext; | |
613 | init_mm.end_data = (unsigned long) _edata; | |
614 | init_mm.brk = klimit; | |
615 | ||
616 | irqstack_early_init(); | |
617 | emergency_stack_init(); | |
618 | ||
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619 | stabs_alloc(); |
620 | ||
621 | /* set up the bootmem stuff with available memory */ | |
622 | do_init_bootmem(); | |
623 | sparse_init(); | |
624 | ||
0458060c PM |
625 | #ifdef CONFIG_DUMMY_CONSOLE |
626 | conswitchp = &dummy_con; | |
627 | #endif | |
628 | ||
40ef8cbc PM |
629 | ppc_md.setup_arch(); |
630 | ||
631 | /* Use the default idle loop if the platform hasn't provided one. */ | |
632 | if (NULL == ppc_md.idle_loop) { | |
633 | ppc_md.idle_loop = default_idle; | |
634 | printk(KERN_INFO "Using default idle loop\n"); | |
635 | } | |
636 | ||
637 | paging_init(); | |
638 | ppc64_boot_msg(0x15, "Setup Done"); | |
639 | } | |
640 | ||
641 | ||
642 | /* ToDo: do something useful if ppc_md is not yet setup. */ | |
643 | #define PPC64_LINUX_FUNCTION 0x0f000000 | |
644 | #define PPC64_IPL_MESSAGE 0xc0000000 | |
645 | #define PPC64_TERM_MESSAGE 0xb0000000 | |
646 | ||
647 | static void ppc64_do_msg(unsigned int src, const char *msg) | |
648 | { | |
649 | if (ppc_md.progress) { | |
650 | char buf[128]; | |
651 | ||
652 | sprintf(buf, "%08X\n", src); | |
653 | ppc_md.progress(buf, 0); | |
654 | snprintf(buf, 128, "%s", msg); | |
655 | ppc_md.progress(buf, 0); | |
656 | } | |
657 | } | |
658 | ||
659 | /* Print a boot progress message. */ | |
660 | void ppc64_boot_msg(unsigned int src, const char *msg) | |
661 | { | |
662 | ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); | |
663 | printk("[boot]%04x %s\n", src, msg); | |
664 | } | |
665 | ||
666 | /* Print a termination message (print only -- does not stop the kernel) */ | |
667 | void ppc64_terminate_msg(unsigned int src, const char *msg) | |
668 | { | |
669 | ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg); | |
670 | printk("[terminate]%04x %s\n", src, msg); | |
671 | } | |
672 | ||
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673 | int check_legacy_ioport(unsigned long base_port) |
674 | { | |
675 | if (ppc_md.check_legacy_ioport == NULL) | |
676 | return 0; | |
677 | return ppc_md.check_legacy_ioport(base_port); | |
678 | } | |
679 | EXPORT_SYMBOL(check_legacy_ioport); | |
680 | ||
40ef8cbc PM |
681 | void cpu_die(void) |
682 | { | |
683 | if (ppc_md.cpu_die) | |
684 | ppc_md.cpu_die(); | |
685 | } |