3 * Common boot and setup code.
5 * Copyright (C) 2001 PPC64 Team, IBM Corp
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.
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>
37 #include <asm/kdump.h>
39 #include <asm/processor.h>
40 #include <asm/pgtable.h>
43 #include <asm/machdep.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>
53 #include <asm/iommu.h>
54 #include <asm/serial.h>
55 #include <asm/cache.h>
59 #include <asm/iseries/it_lp_naca.h>
60 #include <asm/firmware.h>
63 #include <asm/kexec.h>
68 #define DBG(fmt...) udbg_printf(fmt)
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
78 /* This one is for use on LPAR machines that support an HVC console
81 extern void udbg_init_debug_lpar(void);
82 /* This one is for use on Apple G5 machines
84 extern void udbg_init_pmac_realmode(void);
85 /* That's RTAS panel debug */
86 extern void call_rtas_display_status_delay(unsigned char c);
87 /* Here's maple real mode debug */
88 extern void udbg_init_maple_realmode(void);
90 #define EARLY_DEBUG_INIT() do {} while(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)
102 int boot_cpuid_phys = 0;
106 /* Pick defaults since we might want to patch instructions
107 * before we've read this from the device tree.
109 struct ppc64_caches ppc64_caches = {
115 EXPORT_SYMBOL_GPL(ppc64_caches);
118 * These are used in binfmt_elf.c to put aux entries on the stack
119 * for each elf executable being started.
125 /* The main machine-dep calls structure
127 struct machdep_calls ppc_md;
128 EXPORT_SYMBOL(ppc_md);
130 #ifdef CONFIG_MAGIC_SYSRQ
131 unsigned long SYSRQ_KEY;
132 #endif /* CONFIG_MAGIC_SYSRQ */
135 static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
136 static struct notifier_block ppc64_panic_block = {
137 .notifier_call = ppc64_panic_event,
138 .priority = INT_MIN /* may not return; must be done last */
143 static int smt_enabled_cmdline;
145 /* Look for ibm,smt-enabled OF option */
146 static void check_smt_enabled(void)
148 struct device_node *dn;
151 /* Allow the command line to overrule the OF option */
152 if (smt_enabled_cmdline)
155 dn = of_find_node_by_path("/options");
158 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
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;
169 /* Look for smt-enabled= cmdline option */
170 static int __init early_smt_enabled(char *p)
172 smt_enabled_cmdline = 1;
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;
184 early_param("smt-enabled", early_smt_enabled);
187 #define check_smt_enabled()
188 #endif /* CONFIG_SMP */
190 extern struct machdep_calls pSeries_md;
191 extern struct machdep_calls pmac_md;
192 extern struct machdep_calls maple_md;
193 extern struct machdep_calls cell_md;
194 extern struct machdep_calls iseries_md;
196 /* Ultimately, stuff them in an elf section like initcalls... */
197 static struct machdep_calls __initdata *machines[] = {
198 #ifdef CONFIG_PPC_PSERIES
200 #endif /* CONFIG_PPC_PSERIES */
201 #ifdef CONFIG_PPC_PMAC
203 #endif /* CONFIG_PPC_PMAC */
204 #ifdef CONFIG_PPC_MAPLE
206 #endif /* CONFIG_PPC_MAPLE */
207 #ifdef CONFIG_PPC_CELL
210 #ifdef CONFIG_PPC_ISERIES
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
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.
235 void __init early_setup(unsigned long dt_ptr)
237 struct paca_struct *lpaca = get_paca();
238 static struct machdep_calls **mach;
241 * Enable early debugging if any specified (see top of
246 DBG(" -> early_setup()\n");
249 * Do early initializations using the flattened device
250 * tree, like retreiving the physical memory map or
251 * calculating/retreiving the hash table size
253 early_init_devtree(__va(dt_ptr));
256 * Iterate all ppc_md structures until we find the proper
257 * one for the current machine type
259 DBG("Probing machine type for platform %x...\n", _machine);
261 for (mach = machines; *mach; mach++) {
262 if ((*mach)->probe(_machine))
265 /* What can we do if we didn't find ? */
267 DBG("No suitable machine found !\n");
272 #ifdef CONFIG_CRASH_DUMP
276 DBG("Found, Initializing memory management...\n");
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
286 * Initialize stab / SLB management except on iSeries
288 if (!firmware_has_feature(FW_FEATURE_ISERIES)) {
289 if (cpu_has_feature(CPU_FTR_SLB))
292 stab_initialize(lpaca->stab_real);
295 DBG(" <- early_setup()\n");
299 void early_setup_secondary(void)
301 struct paca_struct *lpaca = get_paca();
303 /* Mark enabled in PACA */
304 lpaca->proc_enabled = 0;
306 /* Initialize hash table for that CPU */
307 htab_initialize_secondary();
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
313 if (cpu_has_feature(CPU_FTR_SLB))
316 stab_initialize(lpaca->stab_addr);
319 #endif /* CONFIG_SMP */
321 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
322 void smp_release_cpus(void)
324 extern unsigned long __secondary_hold_spinloop;
326 DBG(" -> smp_release_cpus()\n");
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. */
335 __secondary_hold_spinloop = 1;
338 DBG(" <- smp_release_cpus()\n");
341 #define smp_release_cpus()
342 #endif /* CONFIG_SMP || CONFIG_KEXEC */
345 * Initialize some remaining members of the ppc64_caches and systemcfg
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
351 static void __init initialize_cache_info(void)
353 struct device_node *np;
354 unsigned long num_cpus = 0;
356 DBG(" -> initialize_cache_info()\n");
358 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
361 /* We're assuming *all* of the CPUs have the same
362 * d-cache and i-cache sizes... -Peter
365 if ( num_cpus == 1 ) {
370 /* Then read cache informations */
371 if (_machine == PLATFORM_POWERMAC) {
372 dc = "d-cache-block-size";
373 ic = "i-cache-block-size";
375 dc = "d-cache-line-size";
376 ic = "i-cache-line-size";
380 lsize = cur_cpu_spec->dcache_bsize;
381 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
384 lsizep = (u32 *) get_property(np, dc, NULL);
387 if (sizep == 0 || lsizep == 0)
388 DBG("Argh, can't find dcache properties ! "
389 "sizep: %p, lsizep: %p\n", sizep, lsizep);
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;
397 lsize = cur_cpu_spec->icache_bsize;
398 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
401 lsizep = (u32 *)get_property(np, ic, NULL);
404 if (sizep == 0 || lsizep == 0)
405 DBG("Argh, can't find icache properties ! "
406 "sizep: %p, lsizep: %p\n", sizep, lsizep);
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;
415 DBG(" <- initialize_cache_info()\n");
420 * Do some initial setup of the system. The parameters are those which
421 * were passed in from the bootloader.
423 void __init setup_system(void)
425 DBG(" -> setup_system()\n");
428 * Unflatten the device-tree passed by prom_init or kexec
430 unflatten_device_tree();
433 kexec_setup(); /* requires unflattened device tree. */
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
442 * It also sets up the cache line sizes which allows to call
443 * routines like flush_icache_range (used by the hash init
446 initialize_cache_info();
448 #ifdef CONFIG_PPC_RTAS
450 * Initialize RTAS if available
453 #endif /* CONFIG_PPC_RTAS */
456 * Check if we have an initrd provided via the device-tree
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()
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
472 #ifdef CONFIG_PPC_MULTIPLATFORM
473 find_legacy_serial_ports();
477 * "Finish" the device-tree, that is do the actual parsing of
478 * some of the properties like the interrupt map
480 finish_device_tree();
485 #ifdef CONFIG_XMON_DEFAULT
489 * Register early console
491 register_early_udbg_console();
493 /* Save unparsed command line copy for /proc/cmdline */
494 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
499 smp_setup_cpu_maps();
501 /* Release secondary cpus out of their spinloops at 0x60 now that
502 * we can map physical -> logical CPU ids
506 printk("Starting Linux PPC64 %s\n", system_utsname.version);
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);
523 printk("-----------------------------------------------------\n");
527 DBG(" <- setup_system()\n");
530 static int ppc64_panic_event(struct notifier_block *this,
531 unsigned long event, void *ptr)
533 ppc_md.panic((char *)ptr); /* May not return */
537 #ifdef CONFIG_IRQSTACKS
538 static void __init irqstack_early_init(void)
543 * interrupt stacks must be under 256MB, we cannot afford to take
544 * SLB misses on them.
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));
556 #define irqstack_early_init()
560 * Stack space used when we detect a bad kernel stack pointer, and
561 * early in SMP boots before relocation is enabled.
563 static void __init emergency_stack_init(void)
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
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.
577 limit = min(0x10000000UL, lmb.rmo_size);
580 paca[i].emergency_sp =
581 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
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.
589 void __init setup_arch(char **cmdline_p)
591 extern void do_init_bootmem(void);
593 ppc64_boot_msg(0x12, "Setup Arch");
595 *cmdline_p = cmd_line;
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.
602 dcache_bsize = ppc64_caches.dline_size;
603 icache_bsize = ppc64_caches.iline_size;
605 /* reboot on panic */
609 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
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;
616 irqstack_early_init();
617 emergency_stack_init();
621 /* set up the bootmem stuff with available memory */
625 #ifdef CONFIG_DUMMY_CONSOLE
626 conswitchp = &dummy_con;
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");
638 ppc64_boot_msg(0x15, "Setup Done");
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
647 static void ppc64_do_msg(unsigned int src, const char *msg)
649 if (ppc_md.progress) {
652 sprintf(buf, "%08X\n", src);
653 ppc_md.progress(buf, 0);
654 snprintf(buf, 128, "%s", msg);
655 ppc_md.progress(buf, 0);
659 /* Print a boot progress message. */
660 void ppc64_boot_msg(unsigned int src, const char *msg)
662 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
663 printk("[boot]%04x %s\n", src, msg);
666 /* Print a termination message (print only -- does not stop the kernel) */
667 void ppc64_terminate_msg(unsigned int src, const char *msg)
669 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
670 printk("[terminate]%04x %s\n", src, msg);
673 int check_legacy_ioport(unsigned long base_port)
675 if (ppc_md.check_legacy_ioport == NULL)
677 return ppc_md.check_legacy_ioport(base_port);
679 EXPORT_SYMBOL(check_legacy_ioport);