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powerpc: Get 64-bit configs to compile with ARCH=powerpc
[linux-2.6-block.git] / arch / powerpc / kernel / setup_64.c
CommitLineData
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>
37#include <asm/prom.h>
38#include <asm/processor.h>
39#include <asm/pgtable.h>
40#include <asm/bootinfo.h>
41#include <asm/smp.h>
42#include <asm/elf.h>
43#include <asm/machdep.h>
44#include <asm/paca.h>
45#include <asm/ppcdebug.h>
46#include <asm/time.h>
47#include <asm/cputable.h>
48#include <asm/sections.h>
49#include <asm/btext.h>
50#include <asm/nvram.h>
51#include <asm/setup.h>
52#include <asm/system.h>
53#include <asm/rtas.h>
54#include <asm/iommu.h>
55#include <asm/serial.h>
56#include <asm/cache.h>
57#include <asm/page.h>
58#include <asm/mmu.h>
59#include <asm/lmb.h>
60#include <asm/iSeries/ItLpNaca.h>
61#include <asm/firmware.h>
62#include <asm/systemcfg.h>
63
64#ifdef DEBUG
65#define DBG(fmt...) udbg_printf(fmt)
66#else
67#define DBG(fmt...)
68#endif
69
70/*
71 * Here are some early debugging facilities. You can enable one
72 * but your kernel will not boot on anything else if you do so
73 */
74
75/* This one is for use on LPAR machines that support an HVC console
76 * on vterm 0
77 */
78extern void udbg_init_debug_lpar(void);
79/* This one is for use on Apple G5 machines
80 */
81extern void udbg_init_pmac_realmode(void);
82/* That's RTAS panel debug */
83extern void call_rtas_display_status_delay(unsigned char c);
84/* Here's maple real mode debug */
85extern void udbg_init_maple_realmode(void);
86
87#define EARLY_DEBUG_INIT() do {} while(0)
88
89#if 0
90#define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
91#define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
92#define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
93#define EARLY_DEBUG_INIT() \
94 do { udbg_putc = call_rtas_display_status_delay; } while(0)
95#endif
96
97/* extern void *stab; */
98extern unsigned long klimit;
99
100extern void mm_init_ppc64(void);
101extern void stab_initialize(unsigned long stab);
102extern void htab_initialize(void);
103extern void early_init_devtree(void *flat_dt);
104extern void unflatten_device_tree(void);
105
106extern void smp_release_cpus(void);
107
108int have_of = 1;
109int boot_cpuid = 0;
110int boot_cpuid_phys = 0;
111dev_t boot_dev;
112u64 ppc64_pft_size;
113
114struct ppc64_caches ppc64_caches;
115EXPORT_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 */
121int dcache_bsize;
122int icache_bsize;
123int ucache_bsize;
124
125/* The main machine-dep calls structure
126 */
127struct machdep_calls ppc_md;
128EXPORT_SYMBOL(ppc_md);
129
130#ifdef CONFIG_MAGIC_SYSRQ
131unsigned long SYSRQ_KEY;
132#endif /* CONFIG_MAGIC_SYSRQ */
133
134
135static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
136static 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
141/*
142 * Perhaps we can put the pmac screen_info[] here
143 * on pmac as well so we don't need the ifdef's.
144 * Until we get multiple-console support in here
145 * that is. -- Cort
146 * Maybe tie it to serial consoles, since this is really what
147 * these processors use on existing boards. -- Dan
148 */
149struct screen_info screen_info = {
150 .orig_x = 0,
151 .orig_y = 25,
152 .orig_video_cols = 80,
153 .orig_video_lines = 25,
154 .orig_video_isVGA = 1,
155 .orig_video_points = 16
156};
157
158#ifdef CONFIG_SMP
159
160static int smt_enabled_cmdline;
161
162/* Look for ibm,smt-enabled OF option */
163static void check_smt_enabled(void)
164{
165 struct device_node *dn;
166 char *smt_option;
167
168 /* Allow the command line to overrule the OF option */
169 if (smt_enabled_cmdline)
170 return;
171
172 dn = of_find_node_by_path("/options");
173
174 if (dn) {
175 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
176
177 if (smt_option) {
178 if (!strcmp(smt_option, "on"))
179 smt_enabled_at_boot = 1;
180 else if (!strcmp(smt_option, "off"))
181 smt_enabled_at_boot = 0;
182 }
183 }
184}
185
186/* Look for smt-enabled= cmdline option */
187static int __init early_smt_enabled(char *p)
188{
189 smt_enabled_cmdline = 1;
190
191 if (!p)
192 return 0;
193
194 if (!strcmp(p, "on") || !strcmp(p, "1"))
195 smt_enabled_at_boot = 1;
196 else if (!strcmp(p, "off") || !strcmp(p, "0"))
197 smt_enabled_at_boot = 0;
198
199 return 0;
200}
201early_param("smt-enabled", early_smt_enabled);
202
203/**
204 * setup_cpu_maps - initialize the following cpu maps:
205 * cpu_possible_map
206 * cpu_present_map
207 * cpu_sibling_map
208 *
209 * Having the possible map set up early allows us to restrict allocations
210 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
211 *
212 * We do not initialize the online map here; cpus set their own bits in
213 * cpu_online_map as they come up.
214 *
215 * This function is valid only for Open Firmware systems. finish_device_tree
216 * must be called before using this.
217 *
218 * While we're here, we may as well set the "physical" cpu ids in the paca.
219 */
220static void __init setup_cpu_maps(void)
221{
222 struct device_node *dn = NULL;
223 int cpu = 0;
224 int swap_cpuid = 0;
225
226 check_smt_enabled();
227
228 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
229 u32 *intserv;
230 int j, len = sizeof(u32), nthreads;
231
232 intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
233 &len);
234 if (!intserv)
235 intserv = (u32 *)get_property(dn, "reg", NULL);
236
237 nthreads = len / sizeof(u32);
238
239 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
240 cpu_set(cpu, cpu_present_map);
241 set_hard_smp_processor_id(cpu, intserv[j]);
242
243 if (intserv[j] == boot_cpuid_phys)
244 swap_cpuid = cpu;
245 cpu_set(cpu, cpu_possible_map);
246 cpu++;
247 }
248 }
249
250 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
251 * boot cpu is logical 0.
252 */
253 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
254 u32 tmp;
255 tmp = get_hard_smp_processor_id(0);
256 set_hard_smp_processor_id(0, boot_cpuid_phys);
257 set_hard_smp_processor_id(swap_cpuid, tmp);
258 }
259
260 /*
261 * On pSeries LPAR, we need to know how many cpus
262 * could possibly be added to this partition.
263 */
264 if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
265 (dn = of_find_node_by_path("/rtas"))) {
266 int num_addr_cell, num_size_cell, maxcpus;
267 unsigned int *ireg;
268
269 num_addr_cell = prom_n_addr_cells(dn);
270 num_size_cell = prom_n_size_cells(dn);
271
272 ireg = (unsigned int *)
273 get_property(dn, "ibm,lrdr-capacity", NULL);
274
275 if (!ireg)
276 goto out;
277
278 maxcpus = ireg[num_addr_cell + num_size_cell];
279
280 /* Double maxcpus for processors which have SMT capability */
281 if (cpu_has_feature(CPU_FTR_SMT))
282 maxcpus *= 2;
283
284 if (maxcpus > NR_CPUS) {
285 printk(KERN_WARNING
286 "Partition configured for %d cpus, "
287 "operating system maximum is %d.\n",
288 maxcpus, NR_CPUS);
289 maxcpus = NR_CPUS;
290 } else
291 printk(KERN_INFO "Partition configured for %d cpus.\n",
292 maxcpus);
293
294 for (cpu = 0; cpu < maxcpus; cpu++)
295 cpu_set(cpu, cpu_possible_map);
296 out:
297 of_node_put(dn);
298 }
299
300 /*
301 * Do the sibling map; assume only two threads per processor.
302 */
303 for_each_cpu(cpu) {
304 cpu_set(cpu, cpu_sibling_map[cpu]);
305 if (cpu_has_feature(CPU_FTR_SMT))
306 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
307 }
308
309 systemcfg->processorCount = num_present_cpus();
310}
311#endif /* CONFIG_SMP */
312
313extern struct machdep_calls pSeries_md;
314extern struct machdep_calls pmac_md;
315extern struct machdep_calls maple_md;
316extern struct machdep_calls bpa_md;
317extern struct machdep_calls iseries_md;
318
319/* Ultimately, stuff them in an elf section like initcalls... */
320static struct machdep_calls __initdata *machines[] = {
321#ifdef CONFIG_PPC_PSERIES
322 &pSeries_md,
323#endif /* CONFIG_PPC_PSERIES */
324#ifdef CONFIG_PPC_PMAC
325 &pmac_md,
326#endif /* CONFIG_PPC_PMAC */
327#ifdef CONFIG_PPC_MAPLE
328 &maple_md,
329#endif /* CONFIG_PPC_MAPLE */
330#ifdef CONFIG_PPC_BPA
331 &bpa_md,
332#endif
333#ifdef CONFIG_PPC_ISERIES
334 &iseries_md,
335#endif
336 NULL
337};
338
339/*
340 * Early initialization entry point. This is called by head.S
341 * with MMU translation disabled. We rely on the "feature" of
342 * the CPU that ignores the top 2 bits of the address in real
343 * mode so we can access kernel globals normally provided we
344 * only toy with things in the RMO region. From here, we do
345 * some early parsing of the device-tree to setup out LMB
346 * data structures, and allocate & initialize the hash table
347 * and segment tables so we can start running with translation
348 * enabled.
349 *
350 * It is this function which will call the probe() callback of
351 * the various platform types and copy the matching one to the
352 * global ppc_md structure. Your platform can eventually do
353 * some very early initializations from the probe() routine, but
354 * this is not recommended, be very careful as, for example, the
355 * device-tree is not accessible via normal means at this point.
356 */
357
358void __init early_setup(unsigned long dt_ptr)
359{
360 struct paca_struct *lpaca = get_paca();
361 static struct machdep_calls **mach;
362
363 /*
364 * Enable early debugging if any specified (see top of
365 * this file)
366 */
367 EARLY_DEBUG_INIT();
368
369 DBG(" -> early_setup()\n");
370
371 /*
372 * Fill the default DBG level (do we want to keep
373 * that old mecanism around forever ?)
374 */
375 ppcdbg_initialize();
376
377 /*
378 * Do early initializations using the flattened device
379 * tree, like retreiving the physical memory map or
380 * calculating/retreiving the hash table size
381 */
382 early_init_devtree(__va(dt_ptr));
383
384 /*
385 * Iterate all ppc_md structures until we find the proper
386 * one for the current machine type
387 */
388 DBG("Probing machine type for platform %x...\n",
389 systemcfg->platform);
390
391 for (mach = machines; *mach; mach++) {
392 if ((*mach)->probe(systemcfg->platform))
393 break;
394 }
395 /* What can we do if we didn't find ? */
396 if (*mach == NULL) {
397 DBG("No suitable machine found !\n");
398 for (;;);
399 }
400 ppc_md = **mach;
401
402 DBG("Found, Initializing memory management...\n");
403
404 /*
405 * Initialize stab / SLB management
406 */
407 if (!firmware_has_feature(FW_FEATURE_ISERIES))
408 stab_initialize(lpaca->stab_real);
409
410 /*
411 * Initialize the MMU Hash table and create the linear mapping
412 * of memory
413 */
414 htab_initialize();
415
416 DBG(" <- early_setup()\n");
417}
418
419
420/*
421 * Initialize some remaining members of the ppc64_caches and systemcfg structures
422 * (at least until we get rid of them completely). This is mostly some
423 * cache informations about the CPU that will be used by cache flush
424 * routines and/or provided to userland
425 */
426static void __init initialize_cache_info(void)
427{
428 struct device_node *np;
429 unsigned long num_cpus = 0;
430
431 DBG(" -> initialize_cache_info()\n");
432
433 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
434 num_cpus += 1;
435
436 /* We're assuming *all* of the CPUs have the same
437 * d-cache and i-cache sizes... -Peter
438 */
439
440 if ( num_cpus == 1 ) {
441 u32 *sizep, *lsizep;
442 u32 size, lsize;
443 const char *dc, *ic;
444
445 /* Then read cache informations */
446 if (systemcfg->platform == PLATFORM_POWERMAC) {
447 dc = "d-cache-block-size";
448 ic = "i-cache-block-size";
449 } else {
450 dc = "d-cache-line-size";
451 ic = "i-cache-line-size";
452 }
453
454 size = 0;
455 lsize = cur_cpu_spec->dcache_bsize;
456 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
457 if (sizep != NULL)
458 size = *sizep;
459 lsizep = (u32 *) get_property(np, dc, NULL);
460 if (lsizep != NULL)
461 lsize = *lsizep;
462 if (sizep == 0 || lsizep == 0)
463 DBG("Argh, can't find dcache properties ! "
464 "sizep: %p, lsizep: %p\n", sizep, lsizep);
465
466 systemcfg->dcache_size = ppc64_caches.dsize = size;
467 systemcfg->dcache_line_size =
468 ppc64_caches.dline_size = lsize;
469 ppc64_caches.log_dline_size = __ilog2(lsize);
470 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
471
472 size = 0;
473 lsize = cur_cpu_spec->icache_bsize;
474 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
475 if (sizep != NULL)
476 size = *sizep;
477 lsizep = (u32 *)get_property(np, ic, NULL);
478 if (lsizep != NULL)
479 lsize = *lsizep;
480 if (sizep == 0 || lsizep == 0)
481 DBG("Argh, can't find icache properties ! "
482 "sizep: %p, lsizep: %p\n", sizep, lsizep);
483
484 systemcfg->icache_size = ppc64_caches.isize = size;
485 systemcfg->icache_line_size =
486 ppc64_caches.iline_size = lsize;
487 ppc64_caches.log_iline_size = __ilog2(lsize);
488 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
489 }
490 }
491
492 /* Add an eye catcher and the systemcfg layout version number */
493 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
494 systemcfg->version.major = SYSTEMCFG_MAJOR;
495 systemcfg->version.minor = SYSTEMCFG_MINOR;
496 systemcfg->processor = mfspr(SPRN_PVR);
497
498 DBG(" <- initialize_cache_info()\n");
499}
500
501static void __init check_for_initrd(void)
502{
503#ifdef CONFIG_BLK_DEV_INITRD
504 u64 *prop;
505
506 DBG(" -> check_for_initrd()\n");
507
508 if (of_chosen) {
509 prop = (u64 *)get_property(of_chosen,
510 "linux,initrd-start", NULL);
511 if (prop != NULL) {
512 initrd_start = (unsigned long)__va(*prop);
513 prop = (u64 *)get_property(of_chosen,
514 "linux,initrd-end", NULL);
515 if (prop != NULL) {
516 initrd_end = (unsigned long)__va(*prop);
517 initrd_below_start_ok = 1;
518 } else
519 initrd_start = 0;
520 }
521 }
522
523 /* If we were passed an initrd, set the ROOT_DEV properly if the values
524 * look sensible. If not, clear initrd reference.
525 */
526 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
527 initrd_end > initrd_start)
528 ROOT_DEV = Root_RAM0;
529 else
530 initrd_start = initrd_end = 0;
531
532 if (initrd_start)
533 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
534
535 DBG(" <- check_for_initrd()\n");
536#endif /* CONFIG_BLK_DEV_INITRD */
537}
538
539/*
540 * Do some initial setup of the system. The parameters are those which
541 * were passed in from the bootloader.
542 */
543void __init setup_system(void)
544{
545 DBG(" -> setup_system()\n");
546
547 /*
548 * Unflatten the device-tree passed by prom_init or kexec
549 */
550 unflatten_device_tree();
551
552 /*
553 * Fill the ppc64_caches & systemcfg structures with informations
554 * retreived from the device-tree. Need to be called before
555 * finish_device_tree() since the later requires some of the
556 * informations filled up here to properly parse the interrupt
557 * tree.
558 * It also sets up the cache line sizes which allows to call
559 * routines like flush_icache_range (used by the hash init
560 * later on).
561 */
562 initialize_cache_info();
563
564#ifdef CONFIG_PPC_RTAS
565 /*
566 * Initialize RTAS if available
567 */
568 rtas_initialize();
569#endif /* CONFIG_PPC_RTAS */
570 printk("%s:%d rtas.dev=%p (@ %p)\n", __FILE__, __LINE__, rtas.dev,
571 &rtas.dev);
572
573 /*
574 * Check if we have an initrd provided via the device-tree
575 */
576 check_for_initrd();
577 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
578
579 /*
580 * Do some platform specific early initializations, that includes
581 * setting up the hash table pointers. It also sets up some interrupt-mapping
582 * related options that will be used by finish_device_tree()
583 */
584 ppc_md.init_early();
585 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
586
587 /*
588 * "Finish" the device-tree, that is do the actual parsing of
589 * some of the properties like the interrupt map
590 */
591 finish_device_tree();
592 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
593
594 /*
595 * Initialize xmon
596 */
597#ifdef CONFIG_XMON_DEFAULT
598 xmon_init(1);
599#endif
600 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
601 /*
602 * Register early console
603 */
604 register_early_udbg_console();
605 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
606
607 /* Save unparsed command line copy for /proc/cmdline */
608 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
609
610 parse_early_param();
611 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
612
613#ifdef CONFIG_SMP
614 /*
615 * iSeries has already initialized the cpu maps at this point.
616 */
617 setup_cpu_maps();
618 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
619
620 /* Release secondary cpus out of their spinloops at 0x60 now that
621 * we can map physical -> logical CPU ids
622 */
623 smp_release_cpus();
624 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
625#endif
626
627 printk("Starting Linux PPC64 %s\n", system_utsname.version);
628
629 printk("-----------------------------------------------------\n");
630 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
631 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
632 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
633 printk("systemcfg = 0x%p\n", systemcfg);
634 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
635 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
636 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
637 printk("ppc64_caches.dcache_line_size = 0x%x\n",
638 ppc64_caches.dline_size);
639 printk("ppc64_caches.icache_line_size = 0x%x\n",
640 ppc64_caches.iline_size);
641 printk("htab_address = 0x%p\n", htab_address);
642 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
643 printk("-----------------------------------------------------\n");
644 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
645
646 mm_init_ppc64();
647 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
648
649 DBG(" <- setup_system()\n");
650}
651
652/* also used by kexec */
653void machine_shutdown(void)
654{
655 if (ppc_md.nvram_sync)
656 ppc_md.nvram_sync();
657}
658
659void machine_restart(char *cmd)
660{
661 machine_shutdown();
662 ppc_md.restart(cmd);
663#ifdef CONFIG_SMP
664 smp_send_stop();
665#endif
666 printk(KERN_EMERG "System Halted, OK to turn off power\n");
667 local_irq_disable();
668 while (1) ;
669}
670
671void machine_power_off(void)
672{
673 machine_shutdown();
674 ppc_md.power_off();
675#ifdef CONFIG_SMP
676 smp_send_stop();
677#endif
678 printk(KERN_EMERG "System Halted, OK to turn off power\n");
679 local_irq_disable();
680 while (1) ;
681}
682/* Used by the G5 thermal driver */
683EXPORT_SYMBOL_GPL(machine_power_off);
684
685void machine_halt(void)
686{
687 machine_shutdown();
688 ppc_md.halt();
689#ifdef CONFIG_SMP
690 smp_send_stop();
691#endif
692 printk(KERN_EMERG "System Halted, OK to turn off power\n");
693 local_irq_disable();
694 while (1) ;
695}
696
697static int ppc64_panic_event(struct notifier_block *this,
698 unsigned long event, void *ptr)
699{
700 ppc_md.panic((char *)ptr); /* May not return */
701 return NOTIFY_DONE;
702}
703
704
705#ifdef CONFIG_SMP
706DEFINE_PER_CPU(unsigned int, pvr);
707#endif
708
709static int show_cpuinfo(struct seq_file *m, void *v)
710{
711 unsigned long cpu_id = (unsigned long)v - 1;
712 unsigned int pvr;
713 unsigned short maj;
714 unsigned short min;
715
716 if (cpu_id == NR_CPUS) {
717 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
718
719 if (ppc_md.get_cpuinfo != NULL)
720 ppc_md.get_cpuinfo(m);
721
722 return 0;
723 }
724
725 /* We only show online cpus: disable preempt (overzealous, I
726 * knew) to prevent cpu going down. */
727 preempt_disable();
728 if (!cpu_online(cpu_id)) {
729 preempt_enable();
730 return 0;
731 }
732
733#ifdef CONFIG_SMP
734 pvr = per_cpu(pvr, cpu_id);
735#else
736 pvr = mfspr(SPRN_PVR);
737#endif
738 maj = (pvr >> 8) & 0xFF;
739 min = pvr & 0xFF;
740
741 seq_printf(m, "processor\t: %lu\n", cpu_id);
742 seq_printf(m, "cpu\t\t: ");
743
744 if (cur_cpu_spec->pvr_mask)
745 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
746 else
747 seq_printf(m, "unknown (%08x)", pvr);
748
749#ifdef CONFIG_ALTIVEC
750 if (cpu_has_feature(CPU_FTR_ALTIVEC))
751 seq_printf(m, ", altivec supported");
752#endif /* CONFIG_ALTIVEC */
753
754 seq_printf(m, "\n");
755
756 /*
757 * Assume here that all clock rates are the same in a
758 * smp system. -- Cort
759 */
760 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
761 ppc_proc_freq % 1000000);
762
763 seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);
764
765 preempt_enable();
766 return 0;
767}
768
769static void *c_start(struct seq_file *m, loff_t *pos)
770{
771 return *pos <= NR_CPUS ? (void *)((*pos)+1) : NULL;
772}
773static void *c_next(struct seq_file *m, void *v, loff_t *pos)
774{
775 ++*pos;
776 return c_start(m, pos);
777}
778static void c_stop(struct seq_file *m, void *v)
779{
780}
781struct seq_operations cpuinfo_op = {
782 .start =c_start,
783 .next = c_next,
784 .stop = c_stop,
785 .show = show_cpuinfo,
786};
787
788/*
789 * These three variables are used to save values passed to us by prom_init()
790 * via the device tree. The TCE variables are needed because with a memory_limit
791 * in force we may need to explicitly map the TCE are at the top of RAM.
792 */
793unsigned long memory_limit;
794unsigned long tce_alloc_start;
795unsigned long tce_alloc_end;
796
797#ifdef CONFIG_PPC_ISERIES
798/*
799 * On iSeries we just parse the mem=X option from the command line.
800 * On pSeries it's a bit more complicated, see prom_init_mem()
801 */
802static int __init early_parsemem(char *p)
803{
804 if (!p)
805 return 0;
806
807 memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
808
809 return 0;
810}
811early_param("mem", early_parsemem);
812#endif /* CONFIG_PPC_ISERIES */
813
814#ifdef CONFIG_PPC_MULTIPLATFORM
815static int __init set_preferred_console(void)
816{
817 struct device_node *prom_stdout = NULL;
818 char *name;
819 u32 *spd;
820 int offset = 0;
821
822 DBG(" -> set_preferred_console()\n");
823
824 /* The user has requested a console so this is already set up. */
825 if (strstr(saved_command_line, "console=")) {
826 DBG(" console was specified !\n");
827 return -EBUSY;
828 }
829
830 if (!of_chosen) {
831 DBG(" of_chosen is NULL !\n");
832 return -ENODEV;
833 }
834 /* We are getting a weird phandle from OF ... */
835 /* ... So use the full path instead */
836 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
837 if (name == NULL) {
838 DBG(" no linux,stdout-path !\n");
839 return -ENODEV;
840 }
841 prom_stdout = of_find_node_by_path(name);
842 if (!prom_stdout) {
843 DBG(" can't find stdout package %s !\n", name);
844 return -ENODEV;
845 }
846 DBG("stdout is %s\n", prom_stdout->full_name);
847
848 name = (char *)get_property(prom_stdout, "name", NULL);
849 if (!name) {
850 DBG(" stdout package has no name !\n");
851 goto not_found;
852 }
853 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
854
855 if (0)
856 ;
857#ifdef CONFIG_SERIAL_8250_CONSOLE
858 else if (strcmp(name, "serial") == 0) {
859 int i;
860 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
861 if (i > 8) {
862 switch (reg[1]) {
863 case 0x3f8:
864 offset = 0;
865 break;
866 case 0x2f8:
867 offset = 1;
868 break;
869 case 0x898:
870 offset = 2;
871 break;
872 case 0x890:
873 offset = 3;
874 break;
875 default:
876 /* We dont recognise the serial port */
877 goto not_found;
878 }
879 }
880 }
881#endif /* CONFIG_SERIAL_8250_CONSOLE */
882#ifdef CONFIG_PPC_PSERIES
883 else if (strcmp(name, "vty") == 0) {
884 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
885 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
886
887 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
888 /* Host Virtual Serial Interface */
889 int offset;
890 switch (reg[0]) {
891 case 0x30000000:
892 offset = 0;
893 break;
894 case 0x30000001:
895 offset = 1;
896 break;
897 default:
898 goto not_found;
899 }
900 of_node_put(prom_stdout);
901 DBG("Found hvsi console at offset %d\n", offset);
902 return add_preferred_console("hvsi", offset, NULL);
903 } else {
904 /* pSeries LPAR virtual console */
905 of_node_put(prom_stdout);
906 DBG("Found hvc console\n");
907 return add_preferred_console("hvc", 0, NULL);
908 }
909 }
910#endif /* CONFIG_PPC_PSERIES */
911#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
912 else if (strcmp(name, "ch-a") == 0)
913 offset = 0;
914 else if (strcmp(name, "ch-b") == 0)
915 offset = 1;
916#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
917 else
918 goto not_found;
919 of_node_put(prom_stdout);
920
921 DBG("Found serial console at ttyS%d\n", offset);
922
923 if (spd) {
924 static char __initdata opt[16];
925 sprintf(opt, "%d", *spd);
926 return add_preferred_console("ttyS", offset, opt);
927 } else
928 return add_preferred_console("ttyS", offset, NULL);
929
930 not_found:
931 DBG("No preferred console found !\n");
932 of_node_put(prom_stdout);
933 return -ENODEV;
934}
935console_initcall(set_preferred_console);
936#endif /* CONFIG_PPC_MULTIPLATFORM */
937
938#ifdef CONFIG_IRQSTACKS
939static void __init irqstack_early_init(void)
940{
941 unsigned int i;
942
943 /*
944 * interrupt stacks must be under 256MB, we cannot afford to take
945 * SLB misses on them.
946 */
947 for_each_cpu(i) {
948 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
949 THREAD_SIZE, 0x10000000));
950 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
951 THREAD_SIZE, 0x10000000));
952 }
953}
954#else
955#define irqstack_early_init()
956#endif
957
958/*
959 * Stack space used when we detect a bad kernel stack pointer, and
960 * early in SMP boots before relocation is enabled.
961 */
962static void __init emergency_stack_init(void)
963{
964 unsigned long limit;
965 unsigned int i;
966
967 /*
968 * Emergency stacks must be under 256MB, we cannot afford to take
969 * SLB misses on them. The ABI also requires them to be 128-byte
970 * aligned.
971 *
972 * Since we use these as temporary stacks during secondary CPU
973 * bringup, we need to get at them in real mode. This means they
974 * must also be within the RMO region.
975 */
976 limit = min(0x10000000UL, lmb.rmo_size);
977
978 for_each_cpu(i)
979 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
980 limit)) + PAGE_SIZE;
981}
982
983/*
984 * Called from setup_arch to initialize the bitmap of available
985 * syscalls in the systemcfg page
986 */
987void __init setup_syscall_map(void)
988{
989 unsigned int i, count64 = 0, count32 = 0;
990 extern unsigned long *sys_call_table;
991 extern unsigned long sys_ni_syscall;
992
993
994 for (i = 0; i < __NR_syscalls; i++) {
995 if (sys_call_table[i*2] != sys_ni_syscall) {
996 count64++;
997 systemcfg->syscall_map_64[i >> 5] |=
998 0x80000000UL >> (i & 0x1f);
999 }
1000 if (sys_call_table[i*2+1] != sys_ni_syscall) {
1001 count32++;
1002 systemcfg->syscall_map_32[i >> 5] |=
1003 0x80000000UL >> (i & 0x1f);
1004 }
1005 }
1006 printk(KERN_INFO "Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
1007 count32, count64);
1008}
1009
1010/*
1011 * Called into from start_kernel, after lock_kernel has been called.
1012 * Initializes bootmem, which is unsed to manage page allocation until
1013 * mem_init is called.
1014 */
1015void __init setup_arch(char **cmdline_p)
1016{
1017 extern void do_init_bootmem(void);
1018
1019 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
1020 ppc64_boot_msg(0x12, "Setup Arch");
1021
1022 *cmdline_p = cmd_line;
1023
1024 /*
1025 * Set cache line size based on type of cpu as a default.
1026 * Systems with OF can look in the properties on the cpu node(s)
1027 * for a possibly more accurate value.
1028 */
1029 dcache_bsize = ppc64_caches.dline_size;
1030 icache_bsize = ppc64_caches.iline_size;
1031
1032 /* reboot on panic */
1033 panic_timeout = 180;
1034 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
1035
1036 if (ppc_md.panic)
1037 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
1038
1039 init_mm.start_code = PAGE_OFFSET;
1040 init_mm.end_code = (unsigned long) _etext;
1041 init_mm.end_data = (unsigned long) _edata;
1042 init_mm.brk = klimit;
1043
1044 irqstack_early_init();
1045 emergency_stack_init();
1046
1047 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
1048 stabs_alloc();
1049
1050 /* set up the bootmem stuff with available memory */
1051 do_init_bootmem();
1052 sparse_init();
1053
1054 printk("%s:%d rtas.dev=%p\n", __FILE__, __LINE__, rtas.dev);
1055 /* initialize the syscall map in systemcfg */
1056 setup_syscall_map();
1057
1058 ppc_md.setup_arch();
1059
1060 /* Use the default idle loop if the platform hasn't provided one. */
1061 if (NULL == ppc_md.idle_loop) {
1062 ppc_md.idle_loop = default_idle;
1063 printk(KERN_INFO "Using default idle loop\n");
1064 }
1065
1066 paging_init();
1067 ppc64_boot_msg(0x15, "Setup Done");
1068}
1069
1070
1071/* ToDo: do something useful if ppc_md is not yet setup. */
1072#define PPC64_LINUX_FUNCTION 0x0f000000
1073#define PPC64_IPL_MESSAGE 0xc0000000
1074#define PPC64_TERM_MESSAGE 0xb0000000
1075
1076static void ppc64_do_msg(unsigned int src, const char *msg)
1077{
1078 if (ppc_md.progress) {
1079 char buf[128];
1080
1081 sprintf(buf, "%08X\n", src);
1082 ppc_md.progress(buf, 0);
1083 snprintf(buf, 128, "%s", msg);
1084 ppc_md.progress(buf, 0);
1085 }
1086}
1087
1088/* Print a boot progress message. */
1089void ppc64_boot_msg(unsigned int src, const char *msg)
1090{
1091 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
1092 printk("[boot]%04x %s\n", src, msg);
1093}
1094
1095/* Print a termination message (print only -- does not stop the kernel) */
1096void ppc64_terminate_msg(unsigned int src, const char *msg)
1097{
1098 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
1099 printk("[terminate]%04x %s\n", src, msg);
1100}
1101
1102/* This should only be called on processor 0 during calibrate decr */
1103void __init setup_default_decr(void)
1104{
1105 struct paca_struct *lpaca = get_paca();
1106
1107 lpaca->default_decr = tb_ticks_per_jiffy;
1108 lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
1109}
1110
1111#ifndef CONFIG_PPC_ISERIES
1112/*
1113 * This function can be used by platforms to "find" legacy serial ports.
1114 * It works for "serial" nodes under an "isa" node, and will try to
1115 * respect the "ibm,aix-loc" property if any. It works with up to 8
1116 * ports.
1117 */
1118
1119#define MAX_LEGACY_SERIAL_PORTS 8
1120static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
1121static unsigned int old_serial_count;
1122
1123void __init generic_find_legacy_serial_ports(u64 *physport,
1124 unsigned int *default_speed)
1125{
1126 struct device_node *np;
1127 u32 *sizeprop;
1128
1129 struct isa_reg_property {
1130 u32 space;
1131 u32 address;
1132 u32 size;
1133 };
1134 struct pci_reg_property {
1135 struct pci_address addr;
1136 u32 size_hi;
1137 u32 size_lo;
1138 };
1139
1140 DBG(" -> generic_find_legacy_serial_port()\n");
1141
1142 *physport = 0;
1143 if (default_speed)
1144 *default_speed = 0;
1145
1146 np = of_find_node_by_path("/");
1147 if (!np)
1148 return;
1149
1150 /* First fill our array */
1151 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
1152 struct device_node *isa, *pci;
1153 struct isa_reg_property *reg;
1154 unsigned long phys_size, addr_size, io_base;
1155 u32 *rangesp;
1156 u32 *interrupts, *clk, *spd;
1157 char *typep;
1158 int index, rlen, rentsize;
1159
1160 /* Ok, first check if it's under an "isa" parent */
1161 isa = of_get_parent(np);
1162 if (!isa || strcmp(isa->name, "isa")) {
1163 DBG("%s: no isa parent found\n", np->full_name);
1164 continue;
1165 }
1166
1167 /* Now look for an "ibm,aix-loc" property that gives us ordering
1168 * if any...
1169 */
1170 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
1171
1172 /* Get the ISA port number */
1173 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
1174 if (reg == NULL)
1175 goto next_port;
1176 /* We assume the interrupt number isn't translated ... */
1177 interrupts = (u32 *)get_property(np, "interrupts", NULL);
1178 /* get clock freq. if present */
1179 clk = (u32 *)get_property(np, "clock-frequency", NULL);
1180 /* get default speed if present */
1181 spd = (u32 *)get_property(np, "current-speed", NULL);
1182 /* Default to locate at end of array */
1183 index = old_serial_count; /* end of the array by default */
1184
1185 /* If we have a location index, then use it */
1186 if (typep && *typep == 'S') {
1187 index = simple_strtol(typep+1, NULL, 0) - 1;
1188 /* if index is out of range, use end of array instead */
1189 if (index >= MAX_LEGACY_SERIAL_PORTS)
1190 index = old_serial_count;
1191 /* if our index is still out of range, that mean that
1192 * array is full, we could scan for a free slot but that
1193 * make little sense to bother, just skip the port
1194 */
1195 if (index >= MAX_LEGACY_SERIAL_PORTS)
1196 goto next_port;
1197 if (index >= old_serial_count)
1198 old_serial_count = index + 1;
1199 /* Check if there is a port who already claimed our slot */
1200 if (serial_ports[index].iobase != 0) {
1201 /* if we still have some room, move it, else override */
1202 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
1203 DBG("Moved legacy port %d -> %d\n", index,
1204 old_serial_count);
1205 serial_ports[old_serial_count++] =
1206 serial_ports[index];
1207 } else {
1208 DBG("Replacing legacy port %d\n", index);
1209 }
1210 }
1211 }
1212 if (index >= MAX_LEGACY_SERIAL_PORTS)
1213 goto next_port;
1214 if (index >= old_serial_count)
1215 old_serial_count = index + 1;
1216
1217 /* Now fill the entry */
1218 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
1219 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
1220 serial_ports[index].iobase = reg->address;
1221 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
1222 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
1223
1224 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
1225 index,
1226 serial_ports[index].iobase,
1227 serial_ports[index].irq,
1228 serial_ports[index].uartclk);
1229
1230 /* Get phys address of IO reg for port 1 */
1231 if (index != 0)
1232 goto next_port;
1233
1234 pci = of_get_parent(isa);
1235 if (!pci) {
1236 DBG("%s: no pci parent found\n", np->full_name);
1237 goto next_port;
1238 }
1239
1240 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
1241 if (rangesp == NULL) {
1242 of_node_put(pci);
1243 goto next_port;
1244 }
1245 rlen /= 4;
1246
1247 /* we need the #size-cells of the PCI bridge node itself */
1248 phys_size = 1;
1249 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
1250 if (sizeprop != NULL)
1251 phys_size = *sizeprop;
1252 /* we need the parent #addr-cells */
1253 addr_size = prom_n_addr_cells(pci);
1254 rentsize = 3 + addr_size + phys_size;
1255 io_base = 0;
1256 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
1257 if (((rangesp[0] >> 24) & 0x3) != 1)
1258 continue; /* not IO space */
1259 io_base = rangesp[3];
1260 if (addr_size == 2)
1261 io_base = (io_base << 32) | rangesp[4];
1262 }
1263 if (io_base != 0) {
1264 *physport = io_base + reg->address;
1265 if (default_speed && spd)
1266 *default_speed = *spd;
1267 }
1268 of_node_put(pci);
1269 next_port:
1270 of_node_put(isa);
1271 }
1272
1273 DBG(" <- generic_find_legacy_serial_port()\n");
1274}
1275
1276static struct platform_device serial_device = {
1277 .name = "serial8250",
1278 .id = PLAT8250_DEV_PLATFORM,
1279 .dev = {
1280 .platform_data = serial_ports,
1281 },
1282};
1283
1284static int __init serial_dev_init(void)
1285{
1286 return platform_device_register(&serial_device);
1287}
1288arch_initcall(serial_dev_init);
1289
1290#endif /* CONFIG_PPC_ISERIES */
1291
1292int check_legacy_ioport(unsigned long base_port)
1293{
1294 if (ppc_md.check_legacy_ioport == NULL)
1295 return 0;
1296 return ppc_md.check_legacy_ioport(base_port);
1297}
1298EXPORT_SYMBOL(check_legacy_ioport);
1299
1300#ifdef CONFIG_XMON
1301static int __init early_xmon(char *p)
1302{
1303 /* ensure xmon is enabled */
1304 if (p) {
1305 if (strncmp(p, "on", 2) == 0)
1306 xmon_init(1);
1307 if (strncmp(p, "off", 3) == 0)
1308 xmon_init(0);
1309 if (strncmp(p, "early", 5) != 0)
1310 return 0;
1311 }
1312 xmon_init(1);
1313 debugger(NULL);
1314
1315 return 0;
1316}
1317early_param("xmon", early_xmon);
1318#endif
1319
1320void cpu_die(void)
1321{
1322 if (ppc_md.cpu_die)
1323 ppc_md.cpu_die();
1324}
Linux 6.x block layer and io_uring tree(s)