setup_64.c revision aa98c50dcb5d5b85d2a4c26d54fa1e3c31c11e4b 
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 <linux/bootmem.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/lmb.h>
60#include <asm/iseries/it_lp_naca.h>
61#include <asm/firmware.h>
62#include <asm/xmon.h>
63#include <asm/udbg.h>
64#include <asm/kexec.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 have_of = 1;
75int boot_cpuid = 0;
76dev_t boot_dev;
77u64 ppc64_pft_size;
78
79/* Pick defaults since we might want to patch instructions
80 * before we've read this from the device tree.
81 */
82struct ppc64_caches ppc64_caches = {
83	.dline_size = 0x80,
84	.log_dline_size = 7,
85	.iline_size = 0x80,
86	.log_iline_size = 7
87};
88EXPORT_SYMBOL_GPL(ppc64_caches);
89
90/*
91 * These are used in binfmt_elf.c to put aux entries on the stack
92 * for each elf executable being started.
93 */
94int dcache_bsize;
95int icache_bsize;
96int ucache_bsize;
97
98#ifdef CONFIG_MAGIC_SYSRQ
99unsigned long SYSRQ_KEY;
100#endif /* CONFIG_MAGIC_SYSRQ */
101
102
103#ifdef CONFIG_SMP
104
105static int smt_enabled_cmdline;
106
107/* Look for ibm,smt-enabled OF option */
108static void check_smt_enabled(void)
109{
110	struct device_node *dn;
111	char *smt_option;
112
113	/* Allow the command line to overrule the OF option */
114	if (smt_enabled_cmdline)
115		return;
116
117	dn = of_find_node_by_path("/options");
118
119	if (dn) {
120		smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
121
122                if (smt_option) {
123			if (!strcmp(smt_option, "on"))
124				smt_enabled_at_boot = 1;
125			else if (!strcmp(smt_option, "off"))
126				smt_enabled_at_boot = 0;
127                }
128        }
129}
130
131/* Look for smt-enabled= cmdline option */
132static int __init early_smt_enabled(char *p)
133{
134	smt_enabled_cmdline = 1;
135
136	if (!p)
137		return 0;
138
139	if (!strcmp(p, "on") || !strcmp(p, "1"))
140		smt_enabled_at_boot = 1;
141	else if (!strcmp(p, "off") || !strcmp(p, "0"))
142		smt_enabled_at_boot = 0;
143
144	return 0;
145}
146early_param("smt-enabled", early_smt_enabled);
147
148#else
149#define check_smt_enabled()
150#endif /* CONFIG_SMP */
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	/* Enable early debugging if any specified (see udbg.h) */
174	udbg_early_init();
175
176 	DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
177
178	/*
179	 * Do early initializations using the flattened device
180	 * tree, like retreiving the physical memory map or
181	 * calculating/retreiving the hash table size
182	 */
183	early_init_devtree(__va(dt_ptr));
184
185	/* Now we know the logical id of our boot cpu, setup the paca. */
186	setup_boot_paca();
187
188	/* Fix up paca fields required for the boot cpu */
189	get_paca()->cpu_start = 1;
190	get_paca()->stab_real = __pa((u64)&initial_stab);
191	get_paca()->stab_addr = (u64)&initial_stab;
192
193	/* Probe the machine type */
194	probe_machine();
195
196	setup_kdump_trampoline();
197
198	DBG("Found, Initializing memory management...\n");
199
200	/*
201	 * Initialize the MMU Hash table and create the linear mapping
202	 * of memory. Has to be done before stab/slb initialization as
203	 * this is currently where the page size encoding is obtained
204	 */
205	htab_initialize();
206
207	/*
208	 * Initialize stab / SLB management except on iSeries
209	 */
210	if (cpu_has_feature(CPU_FTR_SLB))
211		slb_initialize();
212	else if (!firmware_has_feature(FW_FEATURE_ISERIES))
213		stab_initialize(get_paca()->stab_real);
214
215	DBG(" <- early_setup()\n");
216}
217
218#ifdef CONFIG_SMP
219void early_setup_secondary(void)
220{
221	struct paca_struct *lpaca = get_paca();
222
223	/* Mark enabled in PACA */
224	lpaca->proc_enabled = 0;
225
226	/* Initialize hash table for that CPU */
227	htab_initialize_secondary();
228
229	/* Initialize STAB/SLB. We use a virtual address as it works
230	 * in real mode on pSeries and we want a virutal address on
231	 * iSeries anyway
232	 */
233	if (cpu_has_feature(CPU_FTR_SLB))
234		slb_initialize();
235	else
236		stab_initialize(lpaca->stab_addr);
237}
238
239#endif /* CONFIG_SMP */
240
241#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
242void smp_release_cpus(void)
243{
244	extern unsigned long __secondary_hold_spinloop;
245	unsigned long *ptr;
246
247	DBG(" -> smp_release_cpus()\n");
248
249	/* All secondary cpus are spinning on a common spinloop, release them
250	 * all now so they can start to spin on their individual paca
251	 * spinloops. For non SMP kernels, the secondary cpus never get out
252	 * of the common spinloop.
253	 * This is useless but harmless on iSeries, secondaries are already
254	 * waiting on their paca spinloops. */
255
256	ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
257			- PHYSICAL_START);
258	*ptr = 1;
259	mb();
260
261	DBG(" <- smp_release_cpus()\n");
262}
263#endif /* CONFIG_SMP || CONFIG_KEXEC */
264
265/*
266 * Initialize some remaining members of the ppc64_caches and systemcfg
267 * structures
268 * (at least until we get rid of them completely). This is mostly some
269 * cache informations about the CPU that will be used by cache flush
270 * routines and/or provided to userland
271 */
272static void __init initialize_cache_info(void)
273{
274	struct device_node *np;
275	unsigned long num_cpus = 0;
276
277	DBG(" -> initialize_cache_info()\n");
278
279	for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
280		num_cpus += 1;
281
282		/* We're assuming *all* of the CPUs have the same
283		 * d-cache and i-cache sizes... -Peter
284		 */
285
286		if ( num_cpus == 1 ) {
287			u32 *sizep, *lsizep;
288			u32 size, lsize;
289			const char *dc, *ic;
290
291			/* Then read cache informations */
292			if (machine_is(powermac)) {
293				dc = "d-cache-block-size";
294				ic = "i-cache-block-size";
295			} else {
296				dc = "d-cache-line-size";
297				ic = "i-cache-line-size";
298			}
299
300			size = 0;
301			lsize = cur_cpu_spec->dcache_bsize;
302			sizep = (u32 *)get_property(np, "d-cache-size", NULL);
303			if (sizep != NULL)
304				size = *sizep;
305			lsizep = (u32 *) get_property(np, dc, NULL);
306			if (lsizep != NULL)
307				lsize = *lsizep;
308			if (sizep == 0 || lsizep == 0)
309				DBG("Argh, can't find dcache properties ! "
310				    "sizep: %p, lsizep: %p\n", sizep, lsizep);
311
312			ppc64_caches.dsize = size;
313			ppc64_caches.dline_size = lsize;
314			ppc64_caches.log_dline_size = __ilog2(lsize);
315			ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
316
317			size = 0;
318			lsize = cur_cpu_spec->icache_bsize;
319			sizep = (u32 *)get_property(np, "i-cache-size", NULL);
320			if (sizep != NULL)
321				size = *sizep;
322			lsizep = (u32 *)get_property(np, ic, 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	/*
349	 * Unflatten the device-tree passed by prom_init or kexec
350	 */
351	unflatten_device_tree();
352
353	/*
354	 * Fill the ppc64_caches & systemcfg structures with informations
355	 * retrieved from the device-tree. Need to be called before
356	 * finish_device_tree() since the later requires some of the
357	 * informations filled up here to properly parse the interrupt tree.
358	 */
359	initialize_cache_info();
360
361#ifdef CONFIG_PPC_RTAS
362	/*
363	 * Initialize RTAS if available
364	 */
365	rtas_initialize();
366#endif /* CONFIG_PPC_RTAS */
367
368	/*
369	 * Check if we have an initrd provided via the device-tree
370	 */
371	check_for_initrd();
372
373	/*
374	 * Do some platform specific early initializations, that includes
375	 * setting up the hash table pointers. It also sets up some interrupt-mapping
376	 * related options that will be used by finish_device_tree()
377	 */
378	ppc_md.init_early();
379
380 	/*
381	 * We can discover serial ports now since the above did setup the
382	 * hash table management for us, thus ioremap works. We do that early
383	 * so that further code can be debugged
384	 */
385	find_legacy_serial_ports();
386
387	/*
388	 * "Finish" the device-tree, that is do the actual parsing of
389	 * some of the properties like the interrupt map
390	 */
391	finish_device_tree();
392
393	/*
394	 * Initialize xmon
395	 */
396#ifdef CONFIG_XMON_DEFAULT
397	xmon_init(1);
398#endif
399	/*
400	 * Register early console
401	 */
402	register_early_udbg_console();
403
404	if (do_early_xmon)
405		debugger(NULL);
406
407	check_smt_enabled();
408	smp_setup_cpu_maps();
409
410#ifdef CONFIG_SMP
411	/* Release secondary cpus out of their spinloops at 0x60 now that
412	 * we can map physical -> logical CPU ids
413	 */
414	smp_release_cpus();
415#endif
416
417	printk("Starting Linux PPC64 %s\n", system_utsname.version);
418
419	printk("-----------------------------------------------------\n");
420	printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
421	printk("ppc64_interrupt_controller    = 0x%ld\n",
422	       ppc64_interrupt_controller);
423	printk("physicalMemorySize            = 0x%lx\n", lmb_phys_mem_size());
424	printk("ppc64_caches.dcache_line_size = 0x%x\n",
425	       ppc64_caches.dline_size);
426	printk("ppc64_caches.icache_line_size = 0x%x\n",
427	       ppc64_caches.iline_size);
428	printk("htab_address                  = 0x%p\n", htab_address);
429	printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
430#if PHYSICAL_START > 0
431	printk("physical_start                = 0x%x\n", PHYSICAL_START);
432#endif
433	printk("-----------------------------------------------------\n");
434
435	DBG(" <- setup_system()\n");
436}
437
438#ifdef CONFIG_IRQSTACKS
439static void __init irqstack_early_init(void)
440{
441	unsigned int i;
442
443	/*
444	 * interrupt stacks must be under 256MB, we cannot afford to take
445	 * SLB misses on them.
446	 */
447	for_each_possible_cpu(i) {
448		softirq_ctx[i] = (struct thread_info *)
449			__va(lmb_alloc_base(THREAD_SIZE,
450					    THREAD_SIZE, 0x10000000));
451		hardirq_ctx[i] = (struct thread_info *)
452			__va(lmb_alloc_base(THREAD_SIZE,
453					    THREAD_SIZE, 0x10000000));
454	}
455}
456#else
457#define irqstack_early_init()
458#endif
459
460/*
461 * Stack space used when we detect a bad kernel stack pointer, and
462 * early in SMP boots before relocation is enabled.
463 */
464static void __init emergency_stack_init(void)
465{
466	unsigned long limit;
467	unsigned int i;
468
469	/*
470	 * Emergency stacks must be under 256MB, we cannot afford to take
471	 * SLB misses on them. The ABI also requires them to be 128-byte
472	 * aligned.
473	 *
474	 * Since we use these as temporary stacks during secondary CPU
475	 * bringup, we need to get at them in real mode. This means they
476	 * must also be within the RMO region.
477	 */
478	limit = min(0x10000000UL, lmb.rmo_size);
479
480	for_each_possible_cpu(i)
481		paca[i].emergency_sp =
482		__va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
483}
484
485/*
486 * Called into from start_kernel, after lock_kernel has been called.
487 * Initializes bootmem, which is unsed to manage page allocation until
488 * mem_init is called.
489 */
490void __init setup_arch(char **cmdline_p)
491{
492	ppc64_boot_msg(0x12, "Setup Arch");
493
494	*cmdline_p = cmd_line;
495
496	/*
497	 * Set cache line size based on type of cpu as a default.
498	 * Systems with OF can look in the properties on the cpu node(s)
499	 * for a possibly more accurate value.
500	 */
501	dcache_bsize = ppc64_caches.dline_size;
502	icache_bsize = ppc64_caches.iline_size;
503
504	/* reboot on panic */
505	panic_timeout = 180;
506
507	if (ppc_md.panic)
508		setup_panic();
509
510	init_mm.start_code = PAGE_OFFSET;
511	init_mm.end_code = (unsigned long) _etext;
512	init_mm.end_data = (unsigned long) _edata;
513	init_mm.brk = klimit;
514
515	irqstack_early_init();
516	emergency_stack_init();
517
518	stabs_alloc();
519
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	ppc_md.setup_arch();
529
530	paging_init();
531	ppc64_boot_msg(0x15, "Setup Done");
532}
533
534
535/* ToDo: do something useful if ppc_md is not yet setup. */
536#define PPC64_LINUX_FUNCTION 0x0f000000
537#define PPC64_IPL_MESSAGE 0xc0000000
538#define PPC64_TERM_MESSAGE 0xb0000000
539
540static void ppc64_do_msg(unsigned int src, const char *msg)
541{
542	if (ppc_md.progress) {
543		char buf[128];
544
545		sprintf(buf, "%08X\n", src);
546		ppc_md.progress(buf, 0);
547		snprintf(buf, 128, "%s", msg);
548		ppc_md.progress(buf, 0);
549	}
550}
551
552/* Print a boot progress message. */
553void ppc64_boot_msg(unsigned int src, const char *msg)
554{
555	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
556	printk("[boot]%04x %s\n", src, msg);
557}
558
559/* Print a termination message (print only -- does not stop the kernel) */
560void ppc64_terminate_msg(unsigned int src, const char *msg)
561{
562	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
563	printk("[terminate]%04x %s\n", src, msg);
564}
565
566void cpu_die(void)
567{
568	if (ppc_md.cpu_die)
569		ppc_md.cpu_die();
570}
571
572#ifdef CONFIG_SMP
573void __init setup_per_cpu_areas(void)
574{
575	int i;
576	unsigned long size;
577	char *ptr;
578
579	/* Copy section for each CPU (we discard the original) */
580	size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
581#ifdef CONFIG_MODULES
582	if (size < PERCPU_ENOUGH_ROOM)
583		size = PERCPU_ENOUGH_ROOM;
584#endif
585
586	for_each_possible_cpu(i) {
587		ptr = alloc_bootmem_node(NODE_DATA(cpu_to_node(i)), size);
588		if (!ptr)
589			panic("Cannot allocate cpu data for CPU %d\n", i);
590
591		paca[i].data_offset = ptr - __per_cpu_start;
592		memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
593	}
594}
595#endif
596