setup_64.c revision e2eb63927bfcb54232163bfec32440246fd44457 
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 <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/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 initializations using the flattened device
185	 * tree, like retreiving the physical memory map or
186	 * calculating/retreiving 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			const char *dc, *ic;
295
296			/* Then read cache informations */
297			if (machine_is(powermac)) {
298				dc = "d-cache-block-size";
299				ic = "i-cache-block-size";
300			} else {
301				dc = "d-cache-line-size";
302				ic = "i-cache-line-size";
303			}
304
305			size = 0;
306			lsize = cur_cpu_spec->dcache_bsize;
307			sizep = of_get_property(np, "d-cache-size", NULL);
308			if (sizep != NULL)
309				size = *sizep;
310			lsizep = of_get_property(np, dc, NULL);
311			if (lsizep != NULL)
312				lsize = *lsizep;
313			if (sizep == 0 || lsizep == 0)
314				DBG("Argh, can't find dcache properties ! "
315				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
316
317			ppc64_caches.dsize = size;
318			ppc64_caches.dline_size = lsize;
319			ppc64_caches.log_dline_size = __ilog2(lsize);
320			ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
321
322			size = 0;
323			lsize = cur_cpu_spec->icache_bsize;
324			sizep = of_get_property(np, "i-cache-size", NULL);
325			if (sizep != NULL)
326				size = *sizep;
327			lsizep = of_get_property(np, ic, NULL);
328			if (lsizep != NULL)
329				lsize = *lsizep;
330			if (sizep == 0 || lsizep == 0)
331				DBG("Argh, can't find icache properties ! "
332				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
333
334			ppc64_caches.isize = size;
335			ppc64_caches.iline_size = lsize;
336			ppc64_caches.log_iline_size = __ilog2(lsize);
337			ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
338		}
339	}
340
341	DBG(" <- initialize_cache_info()\n");
342}
343
344
345/*
346 * Do some initial setup of the system.  The parameters are those which
347 * were passed in from the bootloader.
348 */
349void __init setup_system(void)
350{
351	DBG(" -> setup_system()\n");
352
353	/* Apply the CPUs-specific and firmware specific fixups to kernel
354	 * text (nop out sections not relevant to this CPU or this firmware)
355	 */
356	do_feature_fixups(cur_cpu_spec->cpu_features,
357			  &__start___ftr_fixup, &__stop___ftr_fixup);
358	do_feature_fixups(powerpc_firmware_features,
359			  &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
360
361	/*
362	 * Unflatten the device-tree passed by prom_init or kexec
363	 */
364	unflatten_device_tree();
365
366	/*
367	 * Fill the ppc64_caches & systemcfg structures with informations
368 	 * retrieved from the device-tree.
369	 */
370	initialize_cache_info();
371
372	/*
373	 * Initialize irq remapping subsystem
374	 */
375	irq_early_init();
376
377#ifdef CONFIG_PPC_RTAS
378	/*
379	 * Initialize RTAS if available
380	 */
381	rtas_initialize();
382#endif /* CONFIG_PPC_RTAS */
383
384	/*
385	 * Check if we have an initrd provided via the device-tree
386	 */
387	check_for_initrd();
388
389	/*
390	 * Do some platform specific early initializations, that includes
391	 * setting up the hash table pointers. It also sets up some interrupt-mapping
392	 * related options that will be used by finish_device_tree()
393	 */
394	if (ppc_md.init_early)
395		ppc_md.init_early();
396
397 	/*
398	 * We can discover serial ports now since the above did setup the
399	 * hash table management for us, thus ioremap works. We do that early
400	 * so that further code can be debugged
401	 */
402	find_legacy_serial_ports();
403
404	/*
405	 * Register early console
406	 */
407	register_early_udbg_console();
408
409	/*
410	 * Initialize xmon
411	 */
412	xmon_setup();
413
414	check_smt_enabled();
415	smp_setup_cpu_maps();
416
417#ifdef CONFIG_SMP
418	/* Release secondary cpus out of their spinloops at 0x60 now that
419	 * we can map physical -> logical CPU ids
420	 */
421	smp_release_cpus();
422#endif
423
424	printk("Starting Linux PPC64 %s\n", init_utsname()->version);
425
426	printk("-----------------------------------------------------\n");
427	printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
428	printk("physicalMemorySize            = 0x%lx\n", lmb_phys_mem_size());
429	printk("ppc64_caches.dcache_line_size = 0x%x\n",
430	       ppc64_caches.dline_size);
431	printk("ppc64_caches.icache_line_size = 0x%x\n",
432	       ppc64_caches.iline_size);
433	printk("htab_address                  = 0x%p\n", htab_address);
434	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
435#if PHYSICAL_START > 0
436	printk("physical_start                = 0x%x\n", PHYSICAL_START);
437#endif
438	printk("-----------------------------------------------------\n");
439
440	DBG(" <- setup_system()\n");
441}
442
443#ifdef CONFIG_IRQSTACKS
444static void __init irqstack_early_init(void)
445{
446	unsigned int i;
447
448	/*
449	 * interrupt stacks must be under 256MB, we cannot afford to take
450	 * SLB misses on them.
451	 */
452	for_each_possible_cpu(i) {
453		softirq_ctx[i] = (struct thread_info *)
454			__va(lmb_alloc_base(THREAD_SIZE,
455					    THREAD_SIZE, 0x10000000));
456		hardirq_ctx[i] = (struct thread_info *)
457			__va(lmb_alloc_base(THREAD_SIZE,
458					    THREAD_SIZE, 0x10000000));
459	}
460}
461#else
462#define irqstack_early_init()
463#endif
464
465/*
466 * Stack space used when we detect a bad kernel stack pointer, and
467 * early in SMP boots before relocation is enabled.
468 */
469static void __init emergency_stack_init(void)
470{
471	unsigned long limit;
472	unsigned int i;
473
474	/*
475	 * Emergency stacks must be under 256MB, we cannot afford to take
476	 * SLB misses on them. The ABI also requires them to be 128-byte
477	 * aligned.
478	 *
479	 * Since we use these as temporary stacks during secondary CPU
480	 * bringup, we need to get at them in real mode. This means they
481	 * must also be within the RMO region.
482	 */
483	limit = min(0x10000000UL, lmb.rmo_size);
484
485	for_each_possible_cpu(i)
486		paca[i].emergency_sp =
487		__va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
488}
489
490/*
491 * Called into from start_kernel, after lock_kernel has been called.
492 * Initializes bootmem, which is unsed to manage page allocation until
493 * mem_init is called.
494 */
495void __init setup_arch(char **cmdline_p)
496{
497	ppc64_boot_msg(0x12, "Setup Arch");
498
499	*cmdline_p = cmd_line;
500
501	/*
502	 * Set cache line size based on type of cpu as a default.
503	 * Systems with OF can look in the properties on the cpu node(s)
504	 * for a possibly more accurate value.
505	 */
506	dcache_bsize = ppc64_caches.dline_size;
507	icache_bsize = ppc64_caches.iline_size;
508
509	/* reboot on panic */
510	panic_timeout = 180;
511
512	if (ppc_md.panic)
513		setup_panic();
514
515	init_mm.start_code = PAGE_OFFSET;
516	init_mm.end_code = (unsigned long) _etext;
517	init_mm.end_data = (unsigned long) _edata;
518	init_mm.brk = klimit;
519
520	irqstack_early_init();
521	emergency_stack_init();
522
523	stabs_alloc();
524
525	/* set up the bootmem stuff with available memory */
526	do_init_bootmem();
527	sparse_init();
528
529#ifdef CONFIG_DUMMY_CONSOLE
530	conswitchp = &dummy_con;
531#endif
532
533	ppc_md.setup_arch();
534
535	paging_init();
536	ppc64_boot_msg(0x15, "Setup Done");
537}
538
539
540/* ToDo: do something useful if ppc_md is not yet setup. */
541#define PPC64_LINUX_FUNCTION 0x0f000000
542#define PPC64_IPL_MESSAGE 0xc0000000
543#define PPC64_TERM_MESSAGE 0xb0000000
544
545static void ppc64_do_msg(unsigned int src, const char *msg)
546{
547	if (ppc_md.progress) {
548		char buf[128];
549
550		sprintf(buf, "%08X\n", src);
551		ppc_md.progress(buf, 0);
552		snprintf(buf, 128, "%s", msg);
553		ppc_md.progress(buf, 0);
554	}
555}
556
557/* Print a boot progress message. */
558void ppc64_boot_msg(unsigned int src, const char *msg)
559{
560	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
561	printk("[boot]%04x %s\n", src, msg);
562}
563
564/* Print a termination message (print only -- does not stop the kernel) */
565void ppc64_terminate_msg(unsigned int src, const char *msg)
566{
567	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
568	printk("[terminate]%04x %s\n", src, msg);
569}
570
571void cpu_die(void)
572{
573	if (ppc_md.cpu_die)
574		ppc_md.cpu_die();
575}
576
577#ifdef CONFIG_SMP
578void __init setup_per_cpu_areas(void)
579{
580	int i;
581	unsigned long size;
582	char *ptr;
583
584	/* Copy section for each CPU (we discard the original) */
585	size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
586#ifdef CONFIG_MODULES
587	if (size < PERCPU_ENOUGH_ROOM)
588		size = PERCPU_ENOUGH_ROOM;
589#endif
590
591	for_each_possible_cpu(i) {
592		ptr = alloc_bootmem_node(NODE_DATA(cpu_to_node(i)), size);
593		if (!ptr)
594			panic("Cannot allocate cpu data for CPU %d\n", i);
595
596		paca[i].data_offset = ptr - __per_cpu_start;
597		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
598	}
599}
600#endif
601
602
603#ifdef CONFIG_PPC_INDIRECT_IO
604struct ppc_pci_io ppc_pci_io;
605EXPORT_SYMBOL(ppc_pci_io);
606#endif /* CONFIG_PPC_INDIRECT_IO */
607
608