setup_64.c revision ec3cf2ece22a8ede7478bf38e2a818986322662b 
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/lockdep.h>
37#include <linux/lmb.h>
38#include <asm/io.h>
39#include <asm/kdump.h>
40#include <asm/prom.h>
41#include <asm/processor.h>
42#include <asm/pgtable.h>
43#include <asm/smp.h>
44#include <asm/elf.h>
45#include <asm/machdep.h>
46#include <asm/paca.h>
47#include <asm/time.h>
48#include <asm/cputable.h>
49#include <asm/sections.h>
50#include <asm/btext.h>
51#include <asm/nvram.h>
52#include <asm/setup.h>
53#include <asm/system.h>
54#include <asm/rtas.h>
55#include <asm/iommu.h>
56#include <asm/serial.h>
57#include <asm/cache.h>
58#include <asm/page.h>
59#include <asm/mmu.h>
60#include <asm/firmware.h>
61#include <asm/xmon.h>
62#include <asm/udbg.h>
63#include <asm/kexec.h>
64#include <asm/swiotlb.h>
65
66#include "setup.h"
67
68#ifdef DEBUG
69#define DBG(fmt...) udbg_printf(fmt)
70#else
71#define DBG(fmt...)
72#endif
73
74int boot_cpuid = 0;
75u64 ppc64_pft_size;
76
77/* Pick defaults since we might want to patch instructions
78 * before we've read this from the device tree.
79 */
80struct ppc64_caches ppc64_caches = {
81	.dline_size = 0x40,
82	.log_dline_size = 6,
83	.iline_size = 0x40,
84	.log_iline_size = 6
85};
86EXPORT_SYMBOL_GPL(ppc64_caches);
87
88/*
89 * These are used in binfmt_elf.c to put aux entries on the stack
90 * for each elf executable being started.
91 */
92int dcache_bsize;
93int icache_bsize;
94int ucache_bsize;
95
96#ifdef CONFIG_SMP
97
98static int smt_enabled_cmdline;
99
100/* Look for ibm,smt-enabled OF option */
101static void check_smt_enabled(void)
102{
103	struct device_node *dn;
104	const char *smt_option;
105
106	/* Allow the command line to overrule the OF option */
107	if (smt_enabled_cmdline)
108		return;
109
110	dn = of_find_node_by_path("/options");
111
112	if (dn) {
113		smt_option = of_get_property(dn, "ibm,smt-enabled", NULL);
114
115                if (smt_option) {
116			if (!strcmp(smt_option, "on"))
117				smt_enabled_at_boot = 1;
118			else if (!strcmp(smt_option, "off"))
119				smt_enabled_at_boot = 0;
120                }
121        }
122}
123
124/* Look for smt-enabled= cmdline option */
125static int __init early_smt_enabled(char *p)
126{
127	smt_enabled_cmdline = 1;
128
129	if (!p)
130		return 0;
131
132	if (!strcmp(p, "on") || !strcmp(p, "1"))
133		smt_enabled_at_boot = 1;
134	else if (!strcmp(p, "off") || !strcmp(p, "0"))
135		smt_enabled_at_boot = 0;
136
137	return 0;
138}
139early_param("smt-enabled", early_smt_enabled);
140
141#else
142#define check_smt_enabled()
143#endif /* CONFIG_SMP */
144
145/* Put the paca pointer into r13 and SPRG3 */
146void __init setup_paca(int cpu)
147{
148	local_paca = &paca[cpu];
149	mtspr(SPRN_SPRG3, local_paca);
150}
151
152/*
153 * Early initialization entry point. This is called by head.S
154 * with MMU translation disabled. We rely on the "feature" of
155 * the CPU that ignores the top 2 bits of the address in real
156 * mode so we can access kernel globals normally provided we
157 * only toy with things in the RMO region. From here, we do
158 * some early parsing of the device-tree to setup out LMB
159 * data structures, and allocate & initialize the hash table
160 * and segment tables so we can start running with translation
161 * enabled.
162 *
163 * It is this function which will call the probe() callback of
164 * the various platform types and copy the matching one to the
165 * global ppc_md structure. Your platform can eventually do
166 * some very early initializations from the probe() routine, but
167 * this is not recommended, be very careful as, for example, the
168 * device-tree is not accessible via normal means at this point.
169 */
170
171void __init early_setup(unsigned long dt_ptr)
172{
173	/* -------- printk is _NOT_ safe to use here ! ------- */
174
175	/* Fill in any unititialised pacas */
176	initialise_pacas();
177
178	/* Identify CPU type */
179	identify_cpu(0, mfspr(SPRN_PVR));
180
181	/* Assume we're on cpu 0 for now. Don't write to the paca yet! */
182	setup_paca(0);
183
184	/* Initialize lockdep early or else spinlocks will blow */
185	lockdep_init();
186
187	/* -------- printk is now safe to use ------- */
188
189	/* Enable early debugging if any specified (see udbg.h) */
190	udbg_early_init();
191
192 	DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
193
194	/*
195	 * Do early initialization using the flattened device
196	 * tree, such as retrieving the physical memory map or
197	 * calculating/retrieving the hash table size.
198	 */
199	early_init_devtree(__va(dt_ptr));
200
201	/* Now we know the logical id of our boot cpu, setup the paca. */
202	setup_paca(boot_cpuid);
203
204	/* Fix up paca fields required for the boot cpu */
205	get_paca()->cpu_start = 1;
206
207	/* Probe the machine type */
208	probe_machine();
209
210	setup_kdump_trampoline();
211
212	DBG("Found, Initializing memory management...\n");
213
214	/* Initialize the hash table or TLB handling */
215	early_init_mmu();
216
217	DBG(" <- early_setup()\n");
218}
219
220#ifdef CONFIG_SMP
221void early_setup_secondary(void)
222{
223	/* Mark interrupts enabled in PACA */
224	get_paca()->soft_enabled = 0;
225
226	/* Initialize the hash table or TLB handling */
227	early_init_mmu_secondary();
228}
229
230#endif /* CONFIG_SMP */
231
232#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
233extern unsigned long __secondary_hold_spinloop;
234extern void generic_secondary_smp_init(void);
235
236void smp_release_cpus(void)
237{
238	unsigned long *ptr;
239
240	DBG(" -> smp_release_cpus()\n");
241
242	/* All secondary cpus are spinning on a common spinloop, release them
243	 * all now so they can start to spin on their individual paca
244	 * spinloops. For non SMP kernels, the secondary cpus never get out
245	 * of the common spinloop.
246	 */
247
248	ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
249			- PHYSICAL_START);
250	*ptr = __pa(generic_secondary_smp_init);
251	mb();
252
253	DBG(" <- smp_release_cpus()\n");
254}
255#endif /* CONFIG_SMP || CONFIG_KEXEC */
256
257/*
258 * Initialize some remaining members of the ppc64_caches and systemcfg
259 * structures
260 * (at least until we get rid of them completely). This is mostly some
261 * cache informations about the CPU that will be used by cache flush
262 * routines and/or provided to userland
263 */
264static void __init initialize_cache_info(void)
265{
266	struct device_node *np;
267	unsigned long num_cpus = 0;
268
269	DBG(" -> initialize_cache_info()\n");
270
271	for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
272		num_cpus += 1;
273
274		/* We're assuming *all* of the CPUs have the same
275		 * d-cache and i-cache sizes... -Peter
276		 */
277
278		if ( num_cpus == 1 ) {
279			const u32 *sizep, *lsizep;
280			u32 size, lsize;
281
282			size = 0;
283			lsize = cur_cpu_spec->dcache_bsize;
284			sizep = of_get_property(np, "d-cache-size", NULL);
285			if (sizep != NULL)
286				size = *sizep;
287			lsizep = of_get_property(np, "d-cache-block-size", NULL);
288			/* fallback if block size missing */
289			if (lsizep == NULL)
290				lsizep = of_get_property(np, "d-cache-line-size", NULL);
291			if (lsizep != NULL)
292				lsize = *lsizep;
293			if (sizep == 0 || lsizep == 0)
294				DBG("Argh, can't find dcache properties ! "
295				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
296
297			ppc64_caches.dsize = size;
298			ppc64_caches.dline_size = lsize;
299			ppc64_caches.log_dline_size = __ilog2(lsize);
300			ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
301
302			size = 0;
303			lsize = cur_cpu_spec->icache_bsize;
304			sizep = of_get_property(np, "i-cache-size", NULL);
305			if (sizep != NULL)
306				size = *sizep;
307			lsizep = of_get_property(np, "i-cache-block-size", NULL);
308			if (lsizep == NULL)
309				lsizep = of_get_property(np, "i-cache-line-size", NULL);
310			if (lsizep != NULL)
311				lsize = *lsizep;
312			if (sizep == 0 || lsizep == 0)
313				DBG("Argh, can't find icache properties ! "
314				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
315
316			ppc64_caches.isize = size;
317			ppc64_caches.iline_size = lsize;
318			ppc64_caches.log_iline_size = __ilog2(lsize);
319			ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
320		}
321	}
322
323	DBG(" <- initialize_cache_info()\n");
324}
325
326
327/*
328 * Do some initial setup of the system.  The parameters are those which
329 * were passed in from the bootloader.
330 */
331void __init setup_system(void)
332{
333	DBG(" -> setup_system()\n");
334
335	/* Apply the CPUs-specific and firmware specific fixups to kernel
336	 * text (nop out sections not relevant to this CPU or this firmware)
337	 */
338	do_feature_fixups(cur_cpu_spec->cpu_features,
339			  &__start___ftr_fixup, &__stop___ftr_fixup);
340	do_feature_fixups(cur_cpu_spec->mmu_features,
341			  &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup);
342	do_feature_fixups(powerpc_firmware_features,
343			  &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
344	do_lwsync_fixups(cur_cpu_spec->cpu_features,
345			 &__start___lwsync_fixup, &__stop___lwsync_fixup);
346
347	/*
348	 * Unflatten the device-tree passed by prom_init or kexec
349	 */
350	unflatten_device_tree();
351
352	/*
353	 * Fill the ppc64_caches & systemcfg structures with informations
354 	 * retrieved from the device-tree.
355	 */
356	initialize_cache_info();
357
358	/*
359	 * Initialize irq remapping subsystem
360	 */
361	irq_early_init();
362
363#ifdef CONFIG_PPC_RTAS
364	/*
365	 * Initialize RTAS if available
366	 */
367	rtas_initialize();
368#endif /* CONFIG_PPC_RTAS */
369
370	/*
371	 * Check if we have an initrd provided via the device-tree
372	 */
373	check_for_initrd();
374
375	/*
376	 * Do some platform specific early initializations, that includes
377	 * setting up the hash table pointers. It also sets up some interrupt-mapping
378	 * related options that will be used by finish_device_tree()
379	 */
380	if (ppc_md.init_early)
381		ppc_md.init_early();
382
383 	/*
384	 * We can discover serial ports now since the above did setup the
385	 * hash table management for us, thus ioremap works. We do that early
386	 * so that further code can be debugged
387	 */
388	find_legacy_serial_ports();
389
390	/*
391	 * Register early console
392	 */
393	register_early_udbg_console();
394
395	/*
396	 * Initialize xmon
397	 */
398	xmon_setup();
399
400	check_smt_enabled();
401	smp_setup_cpu_maps();
402
403#ifdef CONFIG_SMP
404	/* Release secondary cpus out of their spinloops at 0x60 now that
405	 * we can map physical -> logical CPU ids
406	 */
407	smp_release_cpus();
408#endif
409
410	printk("Starting Linux PPC64 %s\n", init_utsname()->version);
411
412	printk("-----------------------------------------------------\n");
413	printk("ppc64_pft_size                = 0x%llx\n", ppc64_pft_size);
414	printk("physicalMemorySize            = 0x%llx\n", lmb_phys_mem_size());
415	if (ppc64_caches.dline_size != 0x80)
416		printk("ppc64_caches.dcache_line_size = 0x%x\n",
417		       ppc64_caches.dline_size);
418	if (ppc64_caches.iline_size != 0x80)
419		printk("ppc64_caches.icache_line_size = 0x%x\n",
420		       ppc64_caches.iline_size);
421#ifdef CONFIG_PPC_STD_MMU_64
422	if (htab_address)
423		printk("htab_address                  = 0x%p\n", htab_address);
424	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
425#endif /* CONFIG_PPC_STD_MMU_64 */
426	if (PHYSICAL_START > 0)
427		printk("physical_start                = 0x%lx\n",
428		       PHYSICAL_START);
429	printk("-----------------------------------------------------\n");
430
431	DBG(" <- setup_system()\n");
432}
433
434#ifdef CONFIG_IRQSTACKS
435static void __init irqstack_early_init(void)
436{
437	unsigned int i;
438
439	/*
440	 * interrupt stacks must be under 256MB, we cannot afford to take
441	 * SLB misses on them.
442	 */
443	for_each_possible_cpu(i) {
444		softirq_ctx[i] = (struct thread_info *)
445			__va(lmb_alloc_base(THREAD_SIZE,
446					    THREAD_SIZE, 0x10000000));
447		hardirq_ctx[i] = (struct thread_info *)
448			__va(lmb_alloc_base(THREAD_SIZE,
449					    THREAD_SIZE, 0x10000000));
450	}
451}
452#else
453#define irqstack_early_init()
454#endif
455
456/*
457 * Stack space used when we detect a bad kernel stack pointer, and
458 * early in SMP boots before relocation is enabled.
459 */
460static void __init emergency_stack_init(void)
461{
462	unsigned long limit;
463	unsigned int i;
464
465	/*
466	 * Emergency stacks must be under 256MB, we cannot afford to take
467	 * SLB misses on them. The ABI also requires them to be 128-byte
468	 * aligned.
469	 *
470	 * Since we use these as temporary stacks during secondary CPU
471	 * bringup, we need to get at them in real mode. This means they
472	 * must also be within the RMO region.
473	 */
474	limit = min(0x10000000ULL, lmb.rmo_size);
475
476	for_each_possible_cpu(i) {
477		unsigned long sp;
478		sp  = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
479		sp += THREAD_SIZE;
480		paca[i].emergency_sp = __va(sp);
481	}
482}
483
484/*
485 * Called into from start_kernel, after lock_kernel has been called.
486 * Initializes bootmem, which is unsed to manage page allocation until
487 * mem_init is called.
488 */
489void __init setup_arch(char **cmdline_p)
490{
491	ppc64_boot_msg(0x12, "Setup Arch");
492
493	*cmdline_p = cmd_line;
494
495	/*
496	 * Set cache line size based on type of cpu as a default.
497	 * Systems with OF can look in the properties on the cpu node(s)
498	 * for a possibly more accurate value.
499	 */
500	dcache_bsize = ppc64_caches.dline_size;
501	icache_bsize = ppc64_caches.iline_size;
502
503	/* reboot on panic */
504	panic_timeout = 180;
505
506	if (ppc_md.panic)
507		setup_panic();
508
509	init_mm.start_code = (unsigned long)_stext;
510	init_mm.end_code = (unsigned long) _etext;
511	init_mm.end_data = (unsigned long) _edata;
512	init_mm.brk = klimit;
513
514	irqstack_early_init();
515	emergency_stack_init();
516
517#ifdef CONFIG_PPC_STD_MMU_64
518	stabs_alloc();
519#endif
520	/* set up the bootmem stuff with available memory */
521	do_init_bootmem();
522	sparse_init();
523
524#ifdef CONFIG_DUMMY_CONSOLE
525	conswitchp = &dummy_con;
526#endif
527
528	if (ppc_md.setup_arch)
529		ppc_md.setup_arch();
530
531#ifdef CONFIG_SWIOTLB
532	if (ppc_swiotlb_enable)
533		swiotlb_init();
534#endif
535
536	paging_init();
537	ppc64_boot_msg(0x15, "Setup Done");
538}
539
540
541/* ToDo: do something useful if ppc_md is not yet setup. */
542#define PPC64_LINUX_FUNCTION 0x0f000000
543#define PPC64_IPL_MESSAGE 0xc0000000
544#define PPC64_TERM_MESSAGE 0xb0000000
545
546static void ppc64_do_msg(unsigned int src, const char *msg)
547{
548	if (ppc_md.progress) {
549		char buf[128];
550
551		sprintf(buf, "%08X\n", src);
552		ppc_md.progress(buf, 0);
553		snprintf(buf, 128, "%s", msg);
554		ppc_md.progress(buf, 0);
555	}
556}
557
558/* Print a boot progress message. */
559void ppc64_boot_msg(unsigned int src, const char *msg)
560{
561	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
562	printk("[boot]%04x %s\n", src, msg);
563}
564
565void cpu_die(void)
566{
567	if (ppc_md.cpu_die)
568		ppc_md.cpu_die();
569}
570
571#ifdef CONFIG_SMP
572void __init setup_per_cpu_areas(void)
573{
574	int i;
575	unsigned long size;
576	char *ptr;
577
578	/* Copy section for each CPU (we discard the original) */
579	size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
580#ifdef CONFIG_MODULES
581	if (size < PERCPU_ENOUGH_ROOM)
582		size = PERCPU_ENOUGH_ROOM;
583#endif
584
585	for_each_possible_cpu(i) {
586		ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
587
588		paca[i].data_offset = ptr - __per_cpu_start;
589		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
590	}
591}
592#endif
593
594
595#ifdef CONFIG_PPC_INDIRECT_IO
596struct ppc_pci_io ppc_pci_io;
597EXPORT_SYMBOL(ppc_pci_io);
598#endif /* CONFIG_PPC_INDIRECT_IO */
599
600