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powerpc: Cleanup vpa code
[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>
40ef8cbc
PM		 40#include <asm/smp.h>
41#include <asm/elf.h>
42#include <asm/machdep.h>
43#include <asm/paca.h>
44#include <asm/ppcdebug.h>
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
PM		 60#include <asm/firmware.h>
61#include <asm/systemcfg.h>
f78541dc 62#include <asm/xmon.h>
40ef8cbc
PM		 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
40ef8cbc
PM		 141#ifdef CONFIG_SMP
142
143static int smt_enabled_cmdline;
144
145/* Look for ibm,smt-enabled OF option */
146static 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 */
170static 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}
184early_param("smt-enabled", early_smt_enabled);
185
186/**
187 * setup_cpu_maps - initialize the following cpu maps:
188 * cpu_possible_map
189 * cpu_present_map
190 * cpu_sibling_map
191 *
192 * Having the possible map set up early allows us to restrict allocations
193 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
194 *
195 * We do not initialize the online map here; cpus set their own bits in
196 * cpu_online_map as they come up.
197 *
198 * This function is valid only for Open Firmware systems. finish_device_tree
199 * must be called before using this.
200 *
201 * While we're here, we may as well set the "physical" cpu ids in the paca.
202 */
203static void __init setup_cpu_maps(void)
204{
205 struct device_node *dn = NULL;
206 int cpu = 0;
207 int swap_cpuid = 0;
208
209 check_smt_enabled();
210
211 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
212 u32 *intserv;
213 int j, len = sizeof(u32), nthreads;
214
215 intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
216 &len);
217 if (!intserv)
218 intserv = (u32 *)get_property(dn, "reg", NULL);
219
220 nthreads = len / sizeof(u32);
221
222 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
223 cpu_set(cpu, cpu_present_map);
224 set_hard_smp_processor_id(cpu, intserv[j]);
225
226 if (intserv[j] == boot_cpuid_phys)
227 swap_cpuid = cpu;
228 cpu_set(cpu, cpu_possible_map);
229 cpu++;
230 }
231 }
232
233 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
234 * boot cpu is logical 0.
235 */
236 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
237 u32 tmp;
238 tmp = get_hard_smp_processor_id(0);
239 set_hard_smp_processor_id(0, boot_cpuid_phys);
240 set_hard_smp_processor_id(swap_cpuid, tmp);
241 }
242
243 /*
244 * On pSeries LPAR, we need to know how many cpus
245 * could possibly be added to this partition.
246 */
247 if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
248 (dn = of_find_node_by_path("/rtas"))) {
249 int num_addr_cell, num_size_cell, maxcpus;
250 unsigned int *ireg;
251
252 num_addr_cell = prom_n_addr_cells(dn);
253 num_size_cell = prom_n_size_cells(dn);
254
255 ireg = (unsigned int *)
256 get_property(dn, "ibm,lrdr-capacity", NULL);
257
258 if (!ireg)
259 goto out;
260
261 maxcpus = ireg[num_addr_cell + num_size_cell];
262
263 /* Double maxcpus for processors which have SMT capability */
264 if (cpu_has_feature(CPU_FTR_SMT))
265 maxcpus *= 2;
266
267 if (maxcpus > NR_CPUS) {
268 printk(KERN_WARNING
269 "Partition configured for %d cpus, "
270 "operating system maximum is %d.\n",
271 maxcpus, NR_CPUS);
272 maxcpus = NR_CPUS;
273 } else
274 printk(KERN_INFO "Partition configured for %d cpus.\n",
275 maxcpus);
276
277 for (cpu = 0; cpu < maxcpus; cpu++)
278 cpu_set(cpu, cpu_possible_map);
279 out:
280 of_node_put(dn);
281 }
282
283 /*
284 * Do the sibling map; assume only two threads per processor.
285 */
286 for_each_cpu(cpu) {
287 cpu_set(cpu, cpu_sibling_map[cpu]);
288 if (cpu_has_feature(CPU_FTR_SMT))
289 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
290 }
291
292 systemcfg->processorCount = num_present_cpus();
293}
294#endif /* CONFIG_SMP */
295
296extern struct machdep_calls pSeries_md;
297extern struct machdep_calls pmac_md;
298extern struct machdep_calls maple_md;
f3f66f59 299extern struct machdep_calls cell_md;
40ef8cbc
PM		 300extern struct machdep_calls iseries_md;
301
302/* Ultimately, stuff them in an elf section like initcalls... */
303static struct machdep_calls __initdata *machines[] = {
304#ifdef CONFIG_PPC_PSERIES
305 &pSeries_md,
306#endif /* CONFIG_PPC_PSERIES */
307#ifdef CONFIG_PPC_PMAC
308 &pmac_md,
309#endif /* CONFIG_PPC_PMAC */
310#ifdef CONFIG_PPC_MAPLE
311 &maple_md,
312#endif /* CONFIG_PPC_MAPLE */
f3f66f59
AB		 313#ifdef CONFIG_PPC_CELL
314 &cell_md,
40ef8cbc
PM		 315#endif
316#ifdef CONFIG_PPC_ISERIES
317 &iseries_md,
318#endif
319 NULL
320};
321
322/*
323 * Early initialization entry point. This is called by head.S
324 * with MMU translation disabled. We rely on the "feature" of
325 * the CPU that ignores the top 2 bits of the address in real
326 * mode so we can access kernel globals normally provided we
327 * only toy with things in the RMO region. From here, we do
328 * some early parsing of the device-tree to setup out LMB
329 * data structures, and allocate & initialize the hash table
330 * and segment tables so we can start running with translation
331 * enabled.
332 *
333 * It is this function which will call the probe() callback of
334 * the various platform types and copy the matching one to the
335 * global ppc_md structure. Your platform can eventually do
336 * some very early initializations from the probe() routine, but
337 * this is not recommended, be very careful as, for example, the
338 * device-tree is not accessible via normal means at this point.
339 */
340
341void __init early_setup(unsigned long dt_ptr)
342{
343 struct paca_struct *lpaca = get_paca();
344 static struct machdep_calls **mach;
345
346 /*
347 * Enable early debugging if any specified (see top of
348 * this file)
349 */
350 EARLY_DEBUG_INIT();
351
352 DBG(" -> early_setup()\n");
353
354 /*
355 * Fill the default DBG level (do we want to keep
356 * that old mecanism around forever ?)
357 */
358 ppcdbg_initialize();
359
360 /*
361 * Do early initializations using the flattened device
362 * tree, like retreiving the physical memory map or
363 * calculating/retreiving the hash table size
364 */
365 early_init_devtree(__va(dt_ptr));
366
367 /*
368 * Iterate all ppc_md structures until we find the proper
369 * one for the current machine type
370 */
371 DBG("Probing machine type for platform %x...\n",
372 systemcfg->platform);
373
374 for (mach = machines; *mach; mach++) {
375 if ((*mach)->probe(systemcfg->platform))
376 break;
377 }
378 /* What can we do if we didn't find ? */
379 if (*mach == NULL) {
380 DBG("No suitable machine found !\n");
381 for (;;);
382 }
383 ppc_md = **mach;
384
385 DBG("Found, Initializing memory management...\n");
386
387 /*
388 * Initialize stab / SLB management
389 */
390 if (!firmware_has_feature(FW_FEATURE_ISERIES))
391 stab_initialize(lpaca->stab_real);
392
393 /*
394 * Initialize the MMU Hash table and create the linear mapping
395 * of memory
396 */
397 htab_initialize();
398
399 DBG(" <- early_setup()\n");
400}
401
402
403/*
404 * Initialize some remaining members of the ppc64_caches and systemcfg structures
405 * (at least until we get rid of them completely). This is mostly some
406 * cache informations about the CPU that will be used by cache flush
407 * routines and/or provided to userland
408 */
409static void __init initialize_cache_info(void)
410{
411 struct device_node *np;
412 unsigned long num_cpus = 0;
413
414 DBG(" -> initialize_cache_info()\n");
415
416 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
417 num_cpus += 1;
418
419 /* We're assuming *all* of the CPUs have the same
420 * d-cache and i-cache sizes... -Peter
421 */
422
423 if ( num_cpus == 1 ) {
424 u32 *sizep, *lsizep;
425 u32 size, lsize;
426 const char *dc, *ic;
427
428 /* Then read cache informations */
429 if (systemcfg->platform == PLATFORM_POWERMAC) {
430 dc = "d-cache-block-size";
431 ic = "i-cache-block-size";
432 } else {
433 dc = "d-cache-line-size";
434 ic = "i-cache-line-size";
435 }
436
437 size = 0;
438 lsize = cur_cpu_spec->dcache_bsize;
439 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
440 if (sizep != NULL)
441 size = *sizep;
442 lsizep = (u32 *) get_property(np, dc, NULL);
443 if (lsizep != NULL)
444 lsize = *lsizep;
445 if (sizep == 0 || lsizep == 0)
446 DBG("Argh, can't find dcache properties ! "
447 "sizep: %p, lsizep: %p\n", sizep, lsizep);
448
449 systemcfg->dcache_size = ppc64_caches.dsize = size;
450 systemcfg->dcache_line_size =
451 ppc64_caches.dline_size = lsize;
452 ppc64_caches.log_dline_size = __ilog2(lsize);
453 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
454
455 size = 0;
456 lsize = cur_cpu_spec->icache_bsize;
457 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
458 if (sizep != NULL)
459 size = *sizep;
460 lsizep = (u32 *)get_property(np, ic, NULL);
461 if (lsizep != NULL)
462 lsize = *lsizep;
463 if (sizep == 0 || lsizep == 0)
464 DBG("Argh, can't find icache properties ! "
465 "sizep: %p, lsizep: %p\n", sizep, lsizep);
466
467 systemcfg->icache_size = ppc64_caches.isize = size;
468 systemcfg->icache_line_size =
469 ppc64_caches.iline_size = lsize;
470 ppc64_caches.log_iline_size = __ilog2(lsize);
471 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
472 }
473 }
474
475 /* Add an eye catcher and the systemcfg layout version number */
476 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
477 systemcfg->version.major = SYSTEMCFG_MAJOR;
478 systemcfg->version.minor = SYSTEMCFG_MINOR;
479 systemcfg->processor = mfspr(SPRN_PVR);
480
481 DBG(" <- initialize_cache_info()\n");
482}
483
484static void __init check_for_initrd(void)
485{
486#ifdef CONFIG_BLK_DEV_INITRD
487 u64 *prop;
488
489 DBG(" -> check_for_initrd()\n");
490
491 if (of_chosen) {
492 prop = (u64 *)get_property(of_chosen,
493 "linux,initrd-start", NULL);
494 if (prop != NULL) {
495 initrd_start = (unsigned long)__va(*prop);
496 prop = (u64 *)get_property(of_chosen,
497 "linux,initrd-end", NULL);
498 if (prop != NULL) {
499 initrd_end = (unsigned long)__va(*prop);
500 initrd_below_start_ok = 1;
501 } else
502 initrd_start = 0;
503 }
504 }
505
506 /* If we were passed an initrd, set the ROOT_DEV properly if the values
507 * look sensible. If not, clear initrd reference.
508 */
509 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
510 initrd_end > initrd_start)
511 ROOT_DEV = Root_RAM0;
512 else
513 initrd_start = initrd_end = 0;
514
515 if (initrd_start)
516 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
517
518 DBG(" <- check_for_initrd()\n");
519#endif /* CONFIG_BLK_DEV_INITRD */
520}
521
522/*
523 * Do some initial setup of the system. The parameters are those which
524 * were passed in from the bootloader.
525 */
526void __init setup_system(void)
527{
528 DBG(" -> setup_system()\n");
529
530 /*
531 * Unflatten the device-tree passed by prom_init or kexec
532 */
533 unflatten_device_tree();
534
535 /*
536 * Fill the ppc64_caches & systemcfg structures with informations
537 * retreived from the device-tree. Need to be called before
538 * finish_device_tree() since the later requires some of the
539 * informations filled up here to properly parse the interrupt
540 * tree.
541 * It also sets up the cache line sizes which allows to call
542 * routines like flush_icache_range (used by the hash init
543 * later on).
544 */
545 initialize_cache_info();
546
547#ifdef CONFIG_PPC_RTAS
548 /*
549 * Initialize RTAS if available
550 */
551 rtas_initialize();
552#endif /* CONFIG_PPC_RTAS */
40ef8cbc
PM		 553
554 /*
555 * Check if we have an initrd provided via the device-tree
556 */
557 check_for_initrd();
40ef8cbc
PM		 558
559 /*
560 * Do some platform specific early initializations, that includes
561 * setting up the hash table pointers. It also sets up some interrupt-mapping
562 * related options that will be used by finish_device_tree()
563 */
564 ppc_md.init_early();
40ef8cbc
PM		 565
566 /*
567 * "Finish" the device-tree, that is do the actual parsing of
568 * some of the properties like the interrupt map
569 */
570 finish_device_tree();
40ef8cbc 571
0458060c
PM		 572#ifdef CONFIG_BOOTX_TEXT
573 init_boot_display();
574#endif
575
40ef8cbc
PM		 576 /*
577 * Initialize xmon
578 */
579#ifdef CONFIG_XMON_DEFAULT
580 xmon_init(1);
581#endif
40ef8cbc
PM		 582 /*
583 * Register early console
584 */
585 register_early_udbg_console();
40ef8cbc
PM		 586
587 /* Save unparsed command line copy for /proc/cmdline */
588 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
589
590 parse_early_param();
40ef8cbc
PM		 591
592#ifdef CONFIG_SMP
593 /*
594 * iSeries has already initialized the cpu maps at this point.
595 */
596 setup_cpu_maps();
40ef8cbc
PM		 597
598 /* Release secondary cpus out of their spinloops at 0x60 now that
599 * we can map physical -> logical CPU ids
600 */
601 smp_release_cpus();
40ef8cbc
PM		 602#endif
603
604 printk("Starting Linux PPC64 %s\n", system_utsname.version);
605
606 printk("-----------------------------------------------------\n");
607 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
608 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
609 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
610 printk("systemcfg = 0x%p\n", systemcfg);
611 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
612 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
613 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
614 printk("ppc64_caches.dcache_line_size = 0x%x\n",
615 ppc64_caches.dline_size);
616 printk("ppc64_caches.icache_line_size = 0x%x\n",
617 ppc64_caches.iline_size);
618 printk("htab_address = 0x%p\n", htab_address);
619 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
620 printk("-----------------------------------------------------\n");
40ef8cbc
PM		 621
622 mm_init_ppc64();
40ef8cbc
PM		 623
624 DBG(" <- setup_system()\n");
625}
626
40ef8cbc
PM		 627static int ppc64_panic_event(struct notifier_block *this,
628 unsigned long event, void *ptr)
629{
630 ppc_md.panic((char *)ptr); /* May not return */
631 return NOTIFY_DONE;
632}
633
40ef8cbc
PM		 634#ifdef CONFIG_IRQSTACKS
635static void __init irqstack_early_init(void)
636{
637 unsigned int i;
638
639 /*
640 * interrupt stacks must be under 256MB, we cannot afford to take
641 * SLB misses on them.
642 */
643 for_each_cpu(i) {
644 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
645 THREAD_SIZE, 0x10000000));
646 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
647 THREAD_SIZE, 0x10000000));
648 }
649}
650#else
651#define irqstack_early_init()
652#endif
653
654/*
655 * Stack space used when we detect a bad kernel stack pointer, and
656 * early in SMP boots before relocation is enabled.
657 */
658static void __init emergency_stack_init(void)
659{
660 unsigned long limit;
661 unsigned int i;
662
663 /*
664 * Emergency stacks must be under 256MB, we cannot afford to take
665 * SLB misses on them. The ABI also requires them to be 128-byte
666 * aligned.
667 *
668 * Since we use these as temporary stacks during secondary CPU
669 * bringup, we need to get at them in real mode. This means they
670 * must also be within the RMO region.
671 */
672 limit = min(0x10000000UL, lmb.rmo_size);
673
674 for_each_cpu(i)
675 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
676 limit)) + PAGE_SIZE;
677}
678
679/*
680 * Called from setup_arch to initialize the bitmap of available
681 * syscalls in the systemcfg page
682 */
683void __init setup_syscall_map(void)
684{
685 unsigned int i, count64 = 0, count32 = 0;
640768ee
SR		 686 extern unsigned long *sys_call_table;
687 extern unsigned long sys_ni_syscall;
688
40ef8cbc
PM		 689
690 for (i = 0; i < __NR_syscalls; i++) {
640768ee 691 if (sys_call_table[i*2] != sys_ni_syscall) {
40ef8cbc
PM		 692 count64++;
693 systemcfg->syscall_map_64[i >> 5] |=
694 0x80000000UL >> (i & 0x1f);
695 }
640768ee 696 if (sys_call_table[i*2+1] != sys_ni_syscall) {
40ef8cbc
PM		 697 count32++;
698 systemcfg->syscall_map_32[i >> 5] |=
699 0x80000000UL >> (i & 0x1f);
700 }
701 }
702 printk(KERN_INFO "Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
703 count32, count64);
704}
705
706/*
707 * Called into from start_kernel, after lock_kernel has been called.
708 * Initializes bootmem, which is unsed to manage page allocation until
709 * mem_init is called.
710 */
711void __init setup_arch(char **cmdline_p)
712{
713 extern void do_init_bootmem(void);
714
40ef8cbc
PM		 715 ppc64_boot_msg(0x12, "Setup Arch");
716
717 *cmdline_p = cmd_line;
718
719 /*
720 * Set cache line size based on type of cpu as a default.
721 * Systems with OF can look in the properties on the cpu node(s)
722 * for a possibly more accurate value.
723 */
724 dcache_bsize = ppc64_caches.dline_size;
725 icache_bsize = ppc64_caches.iline_size;
726
727 /* reboot on panic */
728 panic_timeout = 180;
40ef8cbc
PM		 729
730 if (ppc_md.panic)
731 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
732
733 init_mm.start_code = PAGE_OFFSET;
734 init_mm.end_code = (unsigned long) _etext;
735 init_mm.end_data = (unsigned long) _edata;
736 init_mm.brk = klimit;
737
738 irqstack_early_init();
739 emergency_stack_init();
740
40ef8cbc
PM		 741 stabs_alloc();
742
743 /* set up the bootmem stuff with available memory */
744 do_init_bootmem();
745 sparse_init();
746
40ef8cbc
PM		 747 /* initialize the syscall map in systemcfg */
748 setup_syscall_map();
749
0458060c
PM		 750#ifdef CONFIG_DUMMY_CONSOLE
751 conswitchp = &dummy_con;
752#endif
753
40ef8cbc
PM		 754 ppc_md.setup_arch();
755
756 /* Use the default idle loop if the platform hasn't provided one. */
757 if (NULL == ppc_md.idle_loop) {
758 ppc_md.idle_loop = default_idle;
759 printk(KERN_INFO "Using default idle loop\n");
760 }
761
762 paging_init();
763 ppc64_boot_msg(0x15, "Setup Done");
764}
765
766
767/* ToDo: do something useful if ppc_md is not yet setup. */
768#define PPC64_LINUX_FUNCTION 0x0f000000
769#define PPC64_IPL_MESSAGE 0xc0000000
770#define PPC64_TERM_MESSAGE 0xb0000000
771
772static void ppc64_do_msg(unsigned int src, const char *msg)
773{
774 if (ppc_md.progress) {
775 char buf[128];
776
777 sprintf(buf, "%08X\n", src);
778 ppc_md.progress(buf, 0);
779 snprintf(buf, 128, "%s", msg);
780 ppc_md.progress(buf, 0);
781 }
782}
783
784/* Print a boot progress message. */
785void ppc64_boot_msg(unsigned int src, const char *msg)
786{
787 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
788 printk("[boot]%04x %s\n", src, msg);
789}
790
791/* Print a termination message (print only -- does not stop the kernel) */
792void ppc64_terminate_msg(unsigned int src, const char *msg)
793{
794 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
795 printk("[terminate]%04x %s\n", src, msg);
796}
797
40ef8cbc
PM		 798#ifndef CONFIG_PPC_ISERIES
799/*
800 * This function can be used by platforms to "find" legacy serial ports.
801 * It works for "serial" nodes under an "isa" node, and will try to
802 * respect the "ibm,aix-loc" property if any. It works with up to 8
803 * ports.
804 */
805
806#define MAX_LEGACY_SERIAL_PORTS 8
807static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
808static unsigned int old_serial_count;
809
810void __init generic_find_legacy_serial_ports(u64 *physport,
811 unsigned int *default_speed)
812{
813 struct device_node *np;
814 u32 *sizeprop;
815
816 struct isa_reg_property {
817 u32 space;
818 u32 address;
819 u32 size;
820 };
821 struct pci_reg_property {
822 struct pci_address addr;
823 u32 size_hi;
824 u32 size_lo;
825 };
826
827 DBG(" -> generic_find_legacy_serial_port()\n");
828
829 *physport = 0;
830 if (default_speed)
831 *default_speed = 0;
832
833 np = of_find_node_by_path("/");
834 if (!np)
835 return;
836
837 /* First fill our array */
838 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
839 struct device_node *isa, *pci;
840 struct isa_reg_property *reg;
841 unsigned long phys_size, addr_size, io_base;
842 u32 *rangesp;
843 u32 *interrupts, *clk, *spd;
844 char *typep;
845 int index, rlen, rentsize;
846
847 /* Ok, first check if it's under an "isa" parent */
848 isa = of_get_parent(np);
849 if (!isa || strcmp(isa->name, "isa")) {
850 DBG("%s: no isa parent found\n", np->full_name);
851 continue;
852 }
853
854 /* Now look for an "ibm,aix-loc" property that gives us ordering
855 * if any...
856 */
857 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
858
859 /* Get the ISA port number */
860 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
861 if (reg == NULL)
862 goto next_port;
863 /* We assume the interrupt number isn't translated ... */
864 interrupts = (u32 *)get_property(np, "interrupts", NULL);
865 /* get clock freq. if present */
866 clk = (u32 *)get_property(np, "clock-frequency", NULL);
867 /* get default speed if present */
868 spd = (u32 *)get_property(np, "current-speed", NULL);
869 /* Default to locate at end of array */
870 index = old_serial_count; /* end of the array by default */
871
872 /* If we have a location index, then use it */
873 if (typep && *typep == 'S') {
874 index = simple_strtol(typep+1, NULL, 0) - 1;
875 /* if index is out of range, use end of array instead */
876 if (index >= MAX_LEGACY_SERIAL_PORTS)
877 index = old_serial_count;
878 /* if our index is still out of range, that mean that
879 * array is full, we could scan for a free slot but that
880 * make little sense to bother, just skip the port
881 */
882 if (index >= MAX_LEGACY_SERIAL_PORTS)
883 goto next_port;
884 if (index >= old_serial_count)
885 old_serial_count = index + 1;
886 /* Check if there is a port who already claimed our slot */
887 if (serial_ports[index].iobase != 0) {
888 /* if we still have some room, move it, else override */
889 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
890 DBG("Moved legacy port %d -> %d\n", index,
891 old_serial_count);
892 serial_ports[old_serial_count++] =
893 serial_ports[index];
894 } else {
895 DBG("Replacing legacy port %d\n", index);
896 }
897 }
898 }
899 if (index >= MAX_LEGACY_SERIAL_PORTS)
900 goto next_port;
901 if (index >= old_serial_count)
902 old_serial_count = index + 1;
903
904 /* Now fill the entry */
905 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
906 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
907 serial_ports[index].iobase = reg->address;
908 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
909 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
910
911 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
912 index,
913 serial_ports[index].iobase,
914 serial_ports[index].irq,
915 serial_ports[index].uartclk);
916
917 /* Get phys address of IO reg for port 1 */
918 if (index != 0)
919 goto next_port;
920
921 pci = of_get_parent(isa);
922 if (!pci) {
923 DBG("%s: no pci parent found\n", np->full_name);
924 goto next_port;
925 }
926
927 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
928 if (rangesp == NULL) {
929 of_node_put(pci);
930 goto next_port;
931 }
932 rlen /= 4;
933
934 /* we need the #size-cells of the PCI bridge node itself */
935 phys_size = 1;
936 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
937 if (sizeprop != NULL)
938 phys_size = *sizeprop;
939 /* we need the parent #addr-cells */
940 addr_size = prom_n_addr_cells(pci);
941 rentsize = 3 + addr_size + phys_size;
942 io_base = 0;
943 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
944 if (((rangesp[0] >> 24) & 0x3) != 1)
945 continue; /* not IO space */
946 io_base = rangesp[3];
947 if (addr_size == 2)
948 io_base = (io_base << 32) | rangesp[4];
949 }
950 if (io_base != 0) {
951 *physport = io_base + reg->address;
952 if (default_speed && spd)
953 *default_speed = *spd;
954 }
955 of_node_put(pci);
956 next_port:
957 of_node_put(isa);
958 }
959
960 DBG(" <- generic_find_legacy_serial_port()\n");
961}
962
963static struct platform_device serial_device = {
964 .name = "serial8250",
965 .id = PLAT8250_DEV_PLATFORM,
966 .dev = {
967 .platform_data = serial_ports,
968 },
969};
970
971static int __init serial_dev_init(void)
972{
973 return platform_device_register(&serial_device);
974}
975arch_initcall(serial_dev_init);
976
977#endif /* CONFIG_PPC_ISERIES */
978
979int check_legacy_ioport(unsigned long base_port)
980{
981 if (ppc_md.check_legacy_ioport == NULL)
982 return 0;
983 return ppc_md.check_legacy_ioport(base_port);
984}
985EXPORT_SYMBOL(check_legacy_ioport);
986
987#ifdef CONFIG_XMON
988static int __init early_xmon(char *p)
989{
990 /* ensure xmon is enabled */
991 if (p) {
992 if (strncmp(p, "on", 2) == 0)
993 xmon_init(1);
994 if (strncmp(p, "off", 3) == 0)
995 xmon_init(0);
996 if (strncmp(p, "early", 5) != 0)
997 return 0;
998 }
999 xmon_init(1);
1000 debugger(NULL);
1001
1002 return 0;
1003}
1004early_param("xmon", early_xmon);
1005#endif
1006
1007void cpu_die(void)
1008{
1009 if (ppc_md.cpu_die)
1010 ppc_md.cpu_die();
1011}
Linux 6.x block layer and io_uring tree(s)