setup_64.c revision 4846c5deb9776a7306d0f656ade7505278ac39ba 
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/module.h>
16#include <linux/string.h>
17#include <linux/sched.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/reboot.h>
21#include <linux/delay.h>
22#include <linux/initrd.h>
23#include <linux/seq_file.h>
24#include <linux/ioport.h>
25#include <linux/console.h>
26#include <linux/utsname.h>
27#include <linux/tty.h>
28#include <linux/root_dev.h>
29#include <linux/notifier.h>
30#include <linux/cpu.h>
31#include <linux/unistd.h>
32#include <linux/serial.h>
33#include <linux/serial_8250.h>
34#include <linux/bootmem.h>
35#include <linux/pci.h>
36#include <linux/lmb.h>
37#include <asm/io.h>
38#include <asm/kdump.h>
39#include <asm/prom.h>
40#include <asm/processor.h>
41#include <asm/pgtable.h>
42#include <asm/smp.h>
43#include <asm/elf.h>
44#include <asm/machdep.h>
45#include <asm/paca.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/firmware.h>
60#include <asm/xmon.h>
61#include <asm/udbg.h>
62#include <asm/kexec.h>
63
64#include "setup.h"
65
66#ifdef DEBUG
67#define DBG(fmt...) udbg_printf(fmt)
68#else
69#define DBG(fmt...)
70#endif
71
72int have_of = 1;
73int boot_cpuid = 0;
74u64 ppc64_pft_size;
75
76/* Pick defaults since we might want to patch instructions
77 * before we've read this from the device tree.
78 */
79struct ppc64_caches ppc64_caches = {
80	.dline_size = 0x40,
81	.log_dline_size = 6,
82	.iline_size = 0x40,
83	.log_iline_size = 6
84};
85EXPORT_SYMBOL_GPL(ppc64_caches);
86
87/*
88 * These are used in binfmt_elf.c to put aux entries on the stack
89 * for each elf executable being started.
90 */
91int dcache_bsize;
92int icache_bsize;
93int ucache_bsize;
94
95#ifdef CONFIG_SMP
96
97static int smt_enabled_cmdline;
98
99/* Look for ibm,smt-enabled OF option */
100static void check_smt_enabled(void)
101{
102	struct device_node *dn;
103	const char *smt_option;
104
105	/* Allow the command line to overrule the OF option */
106	if (smt_enabled_cmdline)
107		return;
108
109	dn = of_find_node_by_path("/options");
110
111	if (dn) {
112		smt_option = of_get_property(dn, "ibm,smt-enabled", NULL);
113
114                if (smt_option) {
115			if (!strcmp(smt_option, "on"))
116				smt_enabled_at_boot = 1;
117			else if (!strcmp(smt_option, "off"))
118				smt_enabled_at_boot = 0;
119                }
120        }
121}
122
123/* Look for smt-enabled= cmdline option */
124static int __init early_smt_enabled(char *p)
125{
126	smt_enabled_cmdline = 1;
127
128	if (!p)
129		return 0;
130
131	if (!strcmp(p, "on") || !strcmp(p, "1"))
132		smt_enabled_at_boot = 1;
133	else if (!strcmp(p, "off") || !strcmp(p, "0"))
134		smt_enabled_at_boot = 0;
135
136	return 0;
137}
138early_param("smt-enabled", early_smt_enabled);
139
140#else
141#define check_smt_enabled()
142#endif /* CONFIG_SMP */
143
144/* Put the paca pointer into r13 and SPRG3 */
145void __init setup_paca(int cpu)
146{
147	local_paca = &paca[cpu];
148	mtspr(SPRN_SPRG3, local_paca);
149}
150
151/*
152 * Early initialization entry point. This is called by head.S
153 * with MMU translation disabled. We rely on the "feature" of
154 * the CPU that ignores the top 2 bits of the address in real
155 * mode so we can access kernel globals normally provided we
156 * only toy with things in the RMO region. From here, we do
157 * some early parsing of the device-tree to setup out LMB
158 * data structures, and allocate & initialize the hash table
159 * and segment tables so we can start running with translation
160 * enabled.
161 *
162 * It is this function which will call the probe() callback of
163 * the various platform types and copy the matching one to the
164 * global ppc_md structure. Your platform can eventually do
165 * some very early initializations from the probe() routine, but
166 * this is not recommended, be very careful as, for example, the
167 * device-tree is not accessible via normal means at this point.
168 */
169
170void __init early_setup(unsigned long dt_ptr)
171{
172	/* Identify CPU type */
173	identify_cpu(0, mfspr(SPRN_PVR));
174
175	/* Assume we're on cpu 0 for now. Don't write to the paca yet! */
176	setup_paca(0);
177
178	/* Enable early debugging if any specified (see udbg.h) */
179	udbg_early_init();
180
181 	DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
182
183	/*
184	 * Do early initialization using the flattened device
185	 * tree, such as retrieving the physical memory map or
186	 * calculating/retrieving the hash table size.
187	 */
188	early_init_devtree(__va(dt_ptr));
189
190	/* Now we know the logical id of our boot cpu, setup the paca. */
191	setup_paca(boot_cpuid);
192
193	/* Fix up paca fields required for the boot cpu */
194	get_paca()->cpu_start = 1;
195	get_paca()->stab_real = __pa((u64)&initial_stab);
196	get_paca()->stab_addr = (u64)&initial_stab;
197
198	/* Probe the machine type */
199	probe_machine();
200
201	setup_kdump_trampoline();
202
203	DBG("Found, Initializing memory management...\n");
204
205	/*
206	 * Initialize the MMU Hash table and create the linear mapping
207	 * of memory. Has to be done before stab/slb initialization as
208	 * this is currently where the page size encoding is obtained
209	 */
210	htab_initialize();
211
212	/*
213	 * Initialize stab / SLB management except on iSeries
214	 */
215	if (cpu_has_feature(CPU_FTR_SLB))
216		slb_initialize();
217	else if (!firmware_has_feature(FW_FEATURE_ISERIES))
218		stab_initialize(get_paca()->stab_real);
219
220	DBG(" <- early_setup()\n");
221}
222
223#ifdef CONFIG_SMP
224void early_setup_secondary(void)
225{
226	struct paca_struct *lpaca = get_paca();
227
228	/* Mark interrupts enabled in PACA */
229	lpaca->soft_enabled = 0;
230
231	/* Initialize hash table for that CPU */
232	htab_initialize_secondary();
233
234	/* Initialize STAB/SLB. We use a virtual address as it works
235	 * in real mode on pSeries and we want a virutal address on
236	 * iSeries anyway
237	 */
238	if (cpu_has_feature(CPU_FTR_SLB))
239		slb_initialize();
240	else
241		stab_initialize(lpaca->stab_addr);
242}
243
244#endif /* CONFIG_SMP */
245
246#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
247void smp_release_cpus(void)
248{
249	extern unsigned long __secondary_hold_spinloop;
250	unsigned long *ptr;
251
252	DBG(" -> smp_release_cpus()\n");
253
254	/* All secondary cpus are spinning on a common spinloop, release them
255	 * all now so they can start to spin on their individual paca
256	 * spinloops. For non SMP kernels, the secondary cpus never get out
257	 * of the common spinloop.
258	 * This is useless but harmless on iSeries, secondaries are already
259	 * waiting on their paca spinloops. */
260
261	ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
262			- PHYSICAL_START);
263	*ptr = 1;
264	mb();
265
266	DBG(" <- smp_release_cpus()\n");
267}
268#endif /* CONFIG_SMP || CONFIG_KEXEC */
269
270/*
271 * Initialize some remaining members of the ppc64_caches and systemcfg
272 * structures
273 * (at least until we get rid of them completely). This is mostly some
274 * cache informations about the CPU that will be used by cache flush
275 * routines and/or provided to userland
276 */
277static void __init initialize_cache_info(void)
278{
279	struct device_node *np;
280	unsigned long num_cpus = 0;
281
282	DBG(" -> initialize_cache_info()\n");
283
284	for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
285		num_cpus += 1;
286
287		/* We're assuming *all* of the CPUs have the same
288		 * d-cache and i-cache sizes... -Peter
289		 */
290
291		if ( num_cpus == 1 ) {
292			const u32 *sizep, *lsizep;
293			u32 size, lsize;
294
295			size = 0;
296			lsize = cur_cpu_spec->dcache_bsize;
297			sizep = of_get_property(np, "d-cache-size", NULL);
298			if (sizep != NULL)
299				size = *sizep;
300			lsizep = of_get_property(np, "d-cache-block-size", NULL);
301			/* fallback if block size missing */
302			if (lsizep == NULL)
303				lsizep = of_get_property(np, "d-cache-line-size", NULL);
304			if (lsizep != NULL)
305				lsize = *lsizep;
306			if (sizep == 0 || lsizep == 0)
307				DBG("Argh, can't find dcache properties ! "
308				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
309
310			ppc64_caches.dsize = size;
311			ppc64_caches.dline_size = lsize;
312			ppc64_caches.log_dline_size = __ilog2(lsize);
313			ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
314
315			size = 0;
316			lsize = cur_cpu_spec->icache_bsize;
317			sizep = of_get_property(np, "i-cache-size", NULL);
318			if (sizep != NULL)
319				size = *sizep;
320			lsizep = of_get_property(np, "i-cache-block-size", NULL);
321			if (lsizep == NULL)
322				lsizep = of_get_property(np, "i-cache-line-size", NULL);
323			if (lsizep != NULL)
324				lsize = *lsizep;
325			if (sizep == 0 || lsizep == 0)
326				DBG("Argh, can't find icache properties ! "
327				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
328
329			ppc64_caches.isize = size;
330			ppc64_caches.iline_size = lsize;
331			ppc64_caches.log_iline_size = __ilog2(lsize);
332			ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
333		}
334	}
335
336	DBG(" <- initialize_cache_info()\n");
337}
338
339
340/*
341 * Do some initial setup of the system.  The parameters are those which
342 * were passed in from the bootloader.
343 */
344void __init setup_system(void)
345{
346	DBG(" -> setup_system()\n");
347
348	/* Apply the CPUs-specific and firmware specific fixups to kernel
349	 * text (nop out sections not relevant to this CPU or this firmware)
350	 */
351	do_feature_fixups(cur_cpu_spec->cpu_features,
352			  &__start___ftr_fixup, &__stop___ftr_fixup);
353	do_feature_fixups(powerpc_firmware_features,
354			  &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
355
356	/*
357	 * Unflatten the device-tree passed by prom_init or kexec
358	 */
359	unflatten_device_tree();
360
361	/*
362	 * Fill the ppc64_caches & systemcfg structures with informations
363 	 * retrieved from the device-tree.
364	 */
365	initialize_cache_info();
366
367	/*
368	 * Initialize irq remapping subsystem
369	 */
370	irq_early_init();
371
372#ifdef CONFIG_PPC_RTAS
373	/*
374	 * Initialize RTAS if available
375	 */
376	rtas_initialize();
377#endif /* CONFIG_PPC_RTAS */
378
379	/*
380	 * Check if we have an initrd provided via the device-tree
381	 */
382	check_for_initrd();
383
384	/*
385	 * Do some platform specific early initializations, that includes
386	 * setting up the hash table pointers. It also sets up some interrupt-mapping
387	 * related options that will be used by finish_device_tree()
388	 */
389	if (ppc_md.init_early)
390		ppc_md.init_early();
391
392 	/*
393	 * We can discover serial ports now since the above did setup the
394	 * hash table management for us, thus ioremap works. We do that early
395	 * so that further code can be debugged
396	 */
397	find_legacy_serial_ports();
398
399	/*
400	 * Register early console
401	 */
402	register_early_udbg_console();
403
404	/*
405	 * Initialize xmon
406	 */
407	xmon_setup();
408
409	check_smt_enabled();
410	smp_setup_cpu_maps();
411
412#ifdef CONFIG_SMP
413	/* Release secondary cpus out of their spinloops at 0x60 now that
414	 * we can map physical -> logical CPU ids
415	 */
416	smp_release_cpus();
417#endif
418
419	printk("Starting Linux PPC64 %s\n", init_utsname()->version);
420
421	printk("-----------------------------------------------------\n");
422	printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
423	printk("physicalMemorySize            = 0x%lx\n", lmb_phys_mem_size());
424	if (ppc64_caches.dline_size != 0x80)
425		printk("ppc64_caches.dcache_line_size = 0x%x\n",
426		       ppc64_caches.dline_size);
427	if (ppc64_caches.iline_size != 0x80)
428		printk("ppc64_caches.icache_line_size = 0x%x\n",
429		       ppc64_caches.iline_size);
430	if (htab_address)
431		printk("htab_address                  = 0x%p\n", htab_address);
432	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
433#if PHYSICAL_START > 0
434	printk("physical_start                = 0x%x\n", PHYSICAL_START);
435#endif
436	printk("-----------------------------------------------------\n");
437
438	DBG(" <- setup_system()\n");
439}
440
441#ifdef CONFIG_IRQSTACKS
442static void __init irqstack_early_init(void)
443{
444	unsigned int i;
445
446	/*
447	 * interrupt stacks must be under 256MB, we cannot afford to take
448	 * SLB misses on them.
449	 */
450	for_each_possible_cpu(i) {
451		softirq_ctx[i] = (struct thread_info *)
452			__va(lmb_alloc_base(THREAD_SIZE,
453					    THREAD_SIZE, 0x10000000));
454		hardirq_ctx[i] = (struct thread_info *)
455			__va(lmb_alloc_base(THREAD_SIZE,
456					    THREAD_SIZE, 0x10000000));
457	}
458}
459#else
460#define irqstack_early_init()
461#endif
462
463/*
464 * Stack space used when we detect a bad kernel stack pointer, and
465 * early in SMP boots before relocation is enabled.
466 */
467static void __init emergency_stack_init(void)
468{
469	unsigned long limit;
470	unsigned int i;
471
472	/*
473	 * Emergency stacks must be under 256MB, we cannot afford to take
474	 * SLB misses on them. The ABI also requires them to be 128-byte
475	 * aligned.
476	 *
477	 * Since we use these as temporary stacks during secondary CPU
478	 * bringup, we need to get at them in real mode. This means they
479	 * must also be within the RMO region.
480	 */
481	limit = min(0x10000000UL, lmb.rmo_size);
482
483	for_each_possible_cpu(i)
484		paca[i].emergency_sp =
485		__va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
486}
487
488/*
489 * Called into from start_kernel, after lock_kernel has been called.
490 * Initializes bootmem, which is unsed to manage page allocation until
491 * mem_init is called.
492 */
493void __init setup_arch(char **cmdline_p)
494{
495	ppc64_boot_msg(0x12, "Setup Arch");
496
497	*cmdline_p = cmd_line;
498
499	/*
500	 * Set cache line size based on type of cpu as a default.
501	 * Systems with OF can look in the properties on the cpu node(s)
502	 * for a possibly more accurate value.
503	 */
504	dcache_bsize = ppc64_caches.dline_size;
505	icache_bsize = ppc64_caches.iline_size;
506
507	/* reboot on panic */
508	panic_timeout = 180;
509
510	if (ppc_md.panic)
511		setup_panic();
512
513	init_mm.start_code = (unsigned long)_stext;
514	init_mm.end_code = (unsigned long) _etext;
515	init_mm.end_data = (unsigned long) _edata;
516	init_mm.brk = klimit;
517
518	irqstack_early_init();
519	emergency_stack_init();
520
521	stabs_alloc();
522
523	/* set up the bootmem stuff with available memory */
524	do_init_bootmem();
525	sparse_init();
526
527#ifdef CONFIG_DUMMY_CONSOLE
528	conswitchp = &dummy_con;
529#endif
530
531	if (ppc_md.setup_arch)
532		ppc_md.setup_arch();
533
534	paging_init();
535	ppc64_boot_msg(0x15, "Setup Done");
536}
537
538
539/* ToDo: do something useful if ppc_md is not yet setup. */
540#define PPC64_LINUX_FUNCTION 0x0f000000
541#define PPC64_IPL_MESSAGE 0xc0000000
542#define PPC64_TERM_MESSAGE 0xb0000000
543
544static void ppc64_do_msg(unsigned int src, const char *msg)
545{
546	if (ppc_md.progress) {
547		char buf[128];
548
549		sprintf(buf, "%08X\n", src);
550		ppc_md.progress(buf, 0);
551		snprintf(buf, 128, "%s", msg);
552		ppc_md.progress(buf, 0);
553	}
554}
555
556/* Print a boot progress message. */
557void ppc64_boot_msg(unsigned int src, const char *msg)
558{
559	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
560	printk("[boot]%04x %s\n", src, msg);
561}
562
563/* Print a termination message (print only -- does not stop the kernel) */
564void ppc64_terminate_msg(unsigned int src, const char *msg)
565{
566	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
567	printk("[terminate]%04x %s\n", src, msg);
568}
569
570void cpu_die(void)
571{
572	if (ppc_md.cpu_die)
573		ppc_md.cpu_die();
574}
575
576#ifdef CONFIG_SMP
577void __init setup_per_cpu_areas(void)
578{
579	int i;
580	unsigned long size;
581	char *ptr;
582
583	/* Copy section for each CPU (we discard the original) */
584	size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
585#ifdef CONFIG_MODULES
586	if (size < PERCPU_ENOUGH_ROOM)
587		size = PERCPU_ENOUGH_ROOM;
588#endif
589
590	for_each_possible_cpu(i) {
591		ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
592		if (!ptr)
593			panic("Cannot allocate cpu data for CPU %d\n", i);
594
595		paca[i].data_offset = ptr - __per_cpu_start;
596		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
597	}
598
599	/* Now that per_cpu is setup, initialize cpu_sibling_map */
600	smp_setup_cpu_sibling_map();
601}
602#endif
603
604
605#ifdef CONFIG_PPC_INDIRECT_IO
606struct ppc_pci_io ppc_pci_io;
607EXPORT_SYMBOL(ppc_pci_io);
608#endif /* CONFIG_PPC_INDIRECT_IO */
609
610