setup_64.c revision 0cc4746cadda16826a1b3214c042a2f75445b71c 
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/kdump.h>
38#include <asm/prom.h>
39#include <asm/processor.h>
40#include <asm/pgtable.h>
41#include <asm/smp.h>
42#include <asm/elf.h>
43#include <asm/machdep.h>
44#include <asm/paca.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>
59#include <asm/iseries/it_lp_naca.h>
60#include <asm/firmware.h>
61#include <asm/xmon.h>
62#include <asm/udbg.h>
63#include <asm/kexec.h>
64
65#include "setup.h"
66
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 */
81extern void udbg_init_debug_lpar(void);
82/* This one is for use on Apple G5 machines
83 */
84extern void udbg_init_pmac_realmode(void);
85/* That's RTAS panel debug */
86extern void call_rtas_display_status_delay(unsigned char c);
87/* Here's maple real mode debug */
88extern 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
100int have_of = 1;
101int boot_cpuid = 0;
102int boot_cpuid_phys = 0;
103dev_t boot_dev;
104u64 ppc64_pft_size;
105
106/* Pick defaults since we might want to patch instructions
107 * before we've read this from the device tree.
108 */
109struct ppc64_caches ppc64_caches = {
110	.dline_size = 0x80,
111	.log_dline_size = 7,
112	.iline_size = 0x80,
113	.log_iline_size = 7
114};
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#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#else
187#define check_smt_enabled()
188#endif /* CONFIG_SMP */
189
190extern struct machdep_calls pSeries_md;
191extern struct machdep_calls pmac_md;
192extern struct machdep_calls maple_md;
193extern struct machdep_calls cell_md;
194extern struct machdep_calls iseries_md;
195
196/* Ultimately, stuff them in an elf section like initcalls... */
197static 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 */
207#ifdef CONFIG_PPC_CELL
208	&cell_md,
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
235void __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
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	 */
259	DBG("Probing machine type for platform %x...\n", _machine);
260
261	for (mach = machines; *mach; mach++) {
262		if ((*mach)->probe(_machine))
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
272#ifdef CONFIG_CRASH_DUMP
273	kdump_setup();
274#endif
275
276	DBG("Found, Initializing memory management...\n");
277
278	/*
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
282	 */
283	htab_initialize();
284
285	/*
286	 * Initialize stab / SLB management except on iSeries
287	 */
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	}
294
295	DBG(" <- early_setup()\n");
296}
297
298#ifdef CONFIG_SMP
299void 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 */
320
321#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
322void 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}
340#else
341#define smp_release_cpus()
342#endif /* CONFIG_SMP || CONFIG_KEXEC */
343
344/*
345 * Initialize some remaining members of the ppc64_caches and systemcfg
346 * structures
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 */
351static 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 */
371			if (_machine == PLATFORM_POWERMAC) {
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
391			ppc64_caches.dsize = size;
392			ppc64_caches.dline_size = lsize;
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
408			ppc64_caches.isize = size;
409			ppc64_caches.iline_size = lsize;
410			ppc64_caches.log_iline_size = __ilog2(lsize);
411			ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
412		}
413	}
414
415	DBG(" <- initialize_cache_info()\n");
416}
417
418
419/*
420 * Do some initial setup of the system.  The parameters are those which
421 * were passed in from the bootloader.
422 */
423void __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
432#ifdef CONFIG_KEXEC
433	kexec_setup();	/* requires unflattened device tree. */
434#endif
435
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 */
454
455	/*
456	 * Check if we have an initrd provided via the device-tree
457	 */
458	check_for_initrd();
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();
466
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
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();
481
482	/*
483	 * Initialize xmon
484	 */
485#ifdef CONFIG_XMON_DEFAULT
486	xmon_init(1);
487#endif
488	/*
489	 * Register early console
490	 */
491	register_early_udbg_console();
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();
497
498	check_smt_enabled();
499	smp_setup_cpu_maps();
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();
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);
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());
514	printk("ppc64_caches.dcache_line_size = 0x%x\n",
515	       ppc64_caches.dline_size);
516	printk("ppc64_caches.icache_line_size = 0x%x\n",
517	       ppc64_caches.iline_size);
518	printk("htab_address                  = 0x%p\n", htab_address);
519	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
520#if PHYSICAL_START > 0
521	printk("physical_start                = 0x%x\n", PHYSICAL_START);
522#endif
523	printk("-----------------------------------------------------\n");
524
525	mm_init_ppc64();
526
527	DBG(" <- setup_system()\n");
528}
529
530static 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
537#ifdef CONFIG_IRQSTACKS
538static 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) {
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));
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 */
563static 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)
580		paca[i].emergency_sp =
581		__va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
582}
583
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 */
589void __init setup_arch(char **cmdline_p)
590{
591	extern void do_init_bootmem(void);
592
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;
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
619	stabs_alloc();
620
621	/* set up the bootmem stuff with available memory */
622	do_init_bootmem();
623	sparse_init();
624
625#ifdef CONFIG_DUMMY_CONSOLE
626	conswitchp = &dummy_con;
627#endif
628
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
647static 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. */
660void 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) */
667void 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
673int 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}
679EXPORT_SYMBOL(check_legacy_ioport);
680
681void cpu_die(void)
682{
683	if (ppc_md.cpu_die)
684		ppc_md.cpu_die();
685}
686