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/version.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>
38 #include <asm/processor.h>
39 #include <asm/pgtable.h>
40 #include <asm/bootinfo.h>
43 #include <asm/machdep.h>
45 #include <asm/ppcdebug.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>
54 #include <asm/iommu.h>
55 #include <asm/serial.h>
56 #include <asm/cache.h>
60 #include <asm/iSeries/ItLpNaca.h>
63 #define DBG(fmt...) udbg_printf(fmt)
69 * Here are some early debugging facilities. You can enable one
70 * but your kernel will not boot on anything else if you do so
73 /* This one is for use on LPAR machines that support an HVC console
76 extern void udbg_init_debug_lpar(void);
77 /* This one is for use on Apple G5 machines
79 extern void udbg_init_pmac_realmode(void);
80 /* That's RTAS panel debug */
81 extern void call_rtas_display_status_delay(unsigned char c);
82 /* Here's maple real mode debug */
83 extern void udbg_init_maple_realmode(void);
85 #define EARLY_DEBUG_INIT() do {} while(0)
88 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
89 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
90 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
91 #define EARLY_DEBUG_INIT() \
92 do { ppc_md.udbg_putc = call_rtas_display_status_delay; } while(0)
95 /* extern void *stab; */
96 extern unsigned long klimit;
98 extern void mm_init_ppc64(void);
99 extern int idle_setup(void);
100 extern void stab_initialize(unsigned long stab);
101 extern void htab_initialize(void);
102 extern void early_init_devtree(void *flat_dt);
103 extern void unflatten_device_tree(void);
105 extern void smp_release_cpus(void);
109 int boot_cpuid_phys = 0;
112 u64 ppc64_debug_switch;
114 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 */
142 * Perhaps we can put the pmac screen_info[] here
143 * on pmac as well so we don't need the ifdef's.
144 * Until we get multiple-console support in here
146 * Maybe tie it to serial consoles, since this is really what
147 * these processors use on existing boards. -- Dan
149 struct screen_info screen_info = {
152 .orig_video_cols = 80,
153 .orig_video_lines = 25,
154 .orig_video_isVGA = 1,
155 .orig_video_points = 16
159 * Initialize the PPCDBG state. Called before relocation has been enabled.
161 void __init ppcdbg_initialize(void)
163 ppc64_debug_switch = PPC_DEBUG_DEFAULT; /* | PPCDBG_BUSWALK | */
164 /* PPCDBG_PHBINIT | PPCDBG_MM | PPCDBG_MMINIT | PPCDBG_TCEINIT | PPCDBG_TCE */;
168 * Early boot console based on udbg
170 static struct console udbg_console = {
172 .write = udbg_console_write,
173 .flags = CON_PRINTBUFFER,
176 static int early_console_initialized;
178 void __init disable_early_printk(void)
180 if (!early_console_initialized)
182 unregister_console(&udbg_console);
183 early_console_initialized = 0;
186 #if defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP)
188 static int smt_enabled_cmdline;
190 /* Look for ibm,smt-enabled OF option */
191 static void check_smt_enabled(void)
193 struct device_node *dn;
196 /* Allow the command line to overrule the OF option */
197 if (smt_enabled_cmdline)
200 dn = of_find_node_by_path("/options");
203 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
206 if (!strcmp(smt_option, "on"))
207 smt_enabled_at_boot = 1;
208 else if (!strcmp(smt_option, "off"))
209 smt_enabled_at_boot = 0;
214 /* Look for smt-enabled= cmdline option */
215 static int __init early_smt_enabled(char *p)
217 smt_enabled_cmdline = 1;
222 if (!strcmp(p, "on") || !strcmp(p, "1"))
223 smt_enabled_at_boot = 1;
224 else if (!strcmp(p, "off") || !strcmp(p, "0"))
225 smt_enabled_at_boot = 0;
229 early_param("smt-enabled", early_smt_enabled);
232 * setup_cpu_maps - initialize the following cpu maps:
237 * Having the possible map set up early allows us to restrict allocations
238 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
240 * We do not initialize the online map here; cpus set their own bits in
241 * cpu_online_map as they come up.
243 * This function is valid only for Open Firmware systems. finish_device_tree
244 * must be called before using this.
246 * While we're here, we may as well set the "physical" cpu ids in the paca.
248 static void __init setup_cpu_maps(void)
250 struct device_node *dn = NULL;
256 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
258 int j, len = sizeof(u32), nthreads;
260 intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
263 intserv = (u32 *)get_property(dn, "reg", NULL);
265 nthreads = len / sizeof(u32);
267 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
268 cpu_set(cpu, cpu_present_map);
269 set_hard_smp_processor_id(cpu, intserv[j]);
271 if (intserv[j] == boot_cpuid_phys)
273 cpu_set(cpu, cpu_possible_map);
278 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
279 * boot cpu is logical 0.
281 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
283 tmp = get_hard_smp_processor_id(0);
284 set_hard_smp_processor_id(0, boot_cpuid_phys);
285 set_hard_smp_processor_id(swap_cpuid, tmp);
289 * On pSeries LPAR, we need to know how many cpus
290 * could possibly be added to this partition.
292 if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
293 (dn = of_find_node_by_path("/rtas"))) {
294 int num_addr_cell, num_size_cell, maxcpus;
297 num_addr_cell = prom_n_addr_cells(dn);
298 num_size_cell = prom_n_size_cells(dn);
300 ireg = (unsigned int *)
301 get_property(dn, "ibm,lrdr-capacity", NULL);
306 maxcpus = ireg[num_addr_cell + num_size_cell];
308 /* Double maxcpus for processors which have SMT capability */
309 if (cpu_has_feature(CPU_FTR_SMT))
312 if (maxcpus > NR_CPUS) {
314 "Partition configured for %d cpus, "
315 "operating system maximum is %d.\n",
319 printk(KERN_INFO "Partition configured for %d cpus.\n",
322 for (cpu = 0; cpu < maxcpus; cpu++)
323 cpu_set(cpu, cpu_possible_map);
329 * Do the sibling map; assume only two threads per processor.
332 cpu_set(cpu, cpu_sibling_map[cpu]);
333 if (cpu_has_feature(CPU_FTR_SMT))
334 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
337 systemcfg->processorCount = num_present_cpus();
339 #endif /* defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP) */
342 #ifdef CONFIG_PPC_MULTIPLATFORM
344 extern struct machdep_calls pSeries_md;
345 extern struct machdep_calls pmac_md;
346 extern struct machdep_calls maple_md;
347 extern struct machdep_calls bpa_md;
349 /* Ultimately, stuff them in an elf section like initcalls... */
350 static struct machdep_calls __initdata *machines[] = {
351 #ifdef CONFIG_PPC_PSERIES
353 #endif /* CONFIG_PPC_PSERIES */
354 #ifdef CONFIG_PPC_PMAC
356 #endif /* CONFIG_PPC_PMAC */
357 #ifdef CONFIG_PPC_MAPLE
359 #endif /* CONFIG_PPC_MAPLE */
360 #ifdef CONFIG_PPC_BPA
367 * Early initialization entry point. This is called by head.S
368 * with MMU translation disabled. We rely on the "feature" of
369 * the CPU that ignores the top 2 bits of the address in real
370 * mode so we can access kernel globals normally provided we
371 * only toy with things in the RMO region. From here, we do
372 * some early parsing of the device-tree to setup out LMB
373 * data structures, and allocate & initialize the hash table
374 * and segment tables so we can start running with translation
377 * It is this function which will call the probe() callback of
378 * the various platform types and copy the matching one to the
379 * global ppc_md structure. Your platform can eventually do
380 * some very early initializations from the probe() routine, but
381 * this is not recommended, be very careful as, for example, the
382 * device-tree is not accessible via normal means at this point.
385 void __init early_setup(unsigned long dt_ptr)
387 struct paca_struct *lpaca = get_paca();
388 static struct machdep_calls **mach;
391 * Enable early debugging if any specified (see top of
396 DBG(" -> early_setup()\n");
399 * Fill the default DBG level (do we want to keep
400 * that old mecanism around forever ?)
405 * Do early initializations using the flattened device
406 * tree, like retreiving the physical memory map or
407 * calculating/retreiving the hash table size
409 early_init_devtree(__va(dt_ptr));
412 * Iterate all ppc_md structures until we find the proper
413 * one for the current machine type
415 DBG("Probing machine type for platform %x...\n",
416 systemcfg->platform);
418 for (mach = machines; *mach; mach++) {
419 if ((*mach)->probe(systemcfg->platform))
422 /* What can we do if we didn't find ? */
424 DBG("No suitable machine found !\n");
429 /* our udbg callbacks got overriden by the above, let's put them
430 * back in. Ultimately, I want those things to be split from the
435 DBG("Found, Initializing memory management...\n");
438 * Initialize stab / SLB management
440 stab_initialize(lpaca->stab_real);
443 * Initialize the MMU Hash table and create the linear mapping
448 DBG(" <- early_setup()\n");
453 * Initialize some remaining members of the ppc64_caches and systemcfg structures
454 * (at least until we get rid of them completely). This is mostly some
455 * cache informations about the CPU that will be used by cache flush
456 * routines and/or provided to userland
458 static void __init initialize_cache_info(void)
460 struct device_node *np;
461 unsigned long num_cpus = 0;
463 DBG(" -> initialize_cache_info()\n");
465 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
468 /* We're assuming *all* of the CPUs have the same
469 * d-cache and i-cache sizes... -Peter
472 if ( num_cpus == 1 ) {
477 /* Then read cache informations */
478 if (systemcfg->platform == PLATFORM_POWERMAC) {
479 dc = "d-cache-block-size";
480 ic = "i-cache-block-size";
482 dc = "d-cache-line-size";
483 ic = "i-cache-line-size";
487 lsize = cur_cpu_spec->dcache_bsize;
488 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
491 lsizep = (u32 *) get_property(np, dc, NULL);
494 if (sizep == 0 || lsizep == 0)
495 DBG("Argh, can't find dcache properties ! "
496 "sizep: %p, lsizep: %p\n", sizep, lsizep);
498 systemcfg->dcache_size = ppc64_caches.dsize = size;
499 systemcfg->dcache_line_size =
500 ppc64_caches.dline_size = lsize;
501 ppc64_caches.log_dline_size = __ilog2(lsize);
502 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
505 lsize = cur_cpu_spec->icache_bsize;
506 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
509 lsizep = (u32 *)get_property(np, ic, NULL);
512 if (sizep == 0 || lsizep == 0)
513 DBG("Argh, can't find icache properties ! "
514 "sizep: %p, lsizep: %p\n", sizep, lsizep);
516 systemcfg->icache_size = ppc64_caches.isize = size;
517 systemcfg->icache_line_size =
518 ppc64_caches.iline_size = lsize;
519 ppc64_caches.log_iline_size = __ilog2(lsize);
520 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
524 /* Add an eye catcher and the systemcfg layout version number */
525 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
526 systemcfg->version.major = SYSTEMCFG_MAJOR;
527 systemcfg->version.minor = SYSTEMCFG_MINOR;
528 systemcfg->processor = mfspr(SPRN_PVR);
530 DBG(" <- initialize_cache_info()\n");
533 static void __init check_for_initrd(void)
535 #ifdef CONFIG_BLK_DEV_INITRD
538 DBG(" -> check_for_initrd()\n");
540 prop = (u64 *)get_property(of_chosen, "linux,initrd-start", NULL);
542 initrd_start = (unsigned long)__va(*prop);
543 prop = (u64 *)get_property(of_chosen, "linux,initrd-end", NULL);
545 initrd_end = (unsigned long)__va(*prop);
546 initrd_below_start_ok = 1;
551 /* If we were passed an initrd, set the ROOT_DEV properly if the values
552 * look sensible. If not, clear initrd reference.
554 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
555 initrd_end > initrd_start)
556 ROOT_DEV = Root_RAM0;
558 initrd_start = initrd_end = 0;
561 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
563 DBG(" <- check_for_initrd()\n");
564 #endif /* CONFIG_BLK_DEV_INITRD */
567 #endif /* CONFIG_PPC_MULTIPLATFORM */
570 * Do some initial setup of the system. The parameters are those which
571 * were passed in from the bootloader.
573 void __init setup_system(void)
575 DBG(" -> setup_system()\n");
577 #ifdef CONFIG_PPC_ISERIES
578 /* pSeries systems are identified in prom.c via OF. */
579 if (itLpNaca.xLparInstalled == 1)
580 systemcfg->platform = PLATFORM_ISERIES_LPAR;
583 #else /* CONFIG_PPC_ISERIES */
586 * Unflatten the device-tree passed by prom_init or kexec
588 unflatten_device_tree();
591 * Fill the ppc64_caches & systemcfg structures with informations
592 * retreived from the device-tree. Need to be called before
593 * finish_device_tree() since the later requires some of the
594 * informations filled up here to properly parse the interrupt
596 * It also sets up the cache line sizes which allows to call
597 * routines like flush_icache_range (used by the hash init
600 initialize_cache_info();
602 #ifdef CONFIG_PPC_RTAS
604 * Initialize RTAS if available
607 #endif /* CONFIG_PPC_RTAS */
610 * Check if we have an initrd provided via the device-tree
615 * Do some platform specific early initializations, that includes
616 * setting up the hash table pointers. It also sets up some interrupt-mapping
617 * related options that will be used by finish_device_tree()
622 * "Finish" the device-tree, that is do the actual parsing of
623 * some of the properties like the interrupt map
625 finish_device_tree();
630 #ifdef CONFIG_XMON_DEFAULT
634 * Register early console
636 early_console_initialized = 1;
637 register_console(&udbg_console);
639 /* Save unparsed command line copy for /proc/cmdline */
640 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
643 #endif /* !CONFIG_PPC_ISERIES */
645 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES)
647 * iSeries has already initialized the cpu maps at this point.
651 /* Release secondary cpus out of their spinloops at 0x60 now that
652 * we can map physical -> logical CPU ids
655 #endif /* defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES) */
657 printk("Starting Linux PPC64 %s\n", UTS_RELEASE);
659 printk("-----------------------------------------------------\n");
660 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
661 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
662 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
663 printk("systemcfg = 0x%p\n", systemcfg);
664 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
665 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
666 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
667 printk("ppc64_caches.dcache_line_size = 0x%x\n",
668 ppc64_caches.dline_size);
669 printk("ppc64_caches.icache_line_size = 0x%x\n",
670 ppc64_caches.iline_size);
671 printk("htab_address = 0x%p\n", htab_address);
672 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
673 printk("-----------------------------------------------------\n");
677 DBG(" <- setup_system()\n");
681 void machine_restart(char *cmd)
683 if (ppc_md.nvram_sync)
688 EXPORT_SYMBOL(machine_restart);
690 void machine_power_off(void)
692 if (ppc_md.nvram_sync)
697 EXPORT_SYMBOL(machine_power_off);
699 void machine_halt(void)
701 if (ppc_md.nvram_sync)
706 EXPORT_SYMBOL(machine_halt);
708 static int ppc64_panic_event(struct notifier_block *this,
709 unsigned long event, void *ptr)
711 ppc_md.panic((char *)ptr); /* May not return */
717 DEFINE_PER_CPU(unsigned int, pvr);
720 static int show_cpuinfo(struct seq_file *m, void *v)
722 unsigned long cpu_id = (unsigned long)v - 1;
727 if (cpu_id == NR_CPUS) {
728 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
730 if (ppc_md.get_cpuinfo != NULL)
731 ppc_md.get_cpuinfo(m);
736 /* We only show online cpus: disable preempt (overzealous, I
737 * knew) to prevent cpu going down. */
739 if (!cpu_online(cpu_id)) {
745 pvr = per_cpu(pvr, cpu_id);
747 pvr = mfspr(SPRN_PVR);
749 maj = (pvr >> 8) & 0xFF;
752 seq_printf(m, "processor\t: %lu\n", cpu_id);
753 seq_printf(m, "cpu\t\t: ");
755 if (cur_cpu_spec->pvr_mask)
756 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
758 seq_printf(m, "unknown (%08x)", pvr);
760 #ifdef CONFIG_ALTIVEC
761 if (cpu_has_feature(CPU_FTR_ALTIVEC))
762 seq_printf(m, ", altivec supported");
763 #endif /* CONFIG_ALTIVEC */
768 * Assume here that all clock rates are the same in a
769 * smp system. -- Cort
771 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
772 ppc_proc_freq % 1000000);
774 seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);
780 static void *c_start(struct seq_file *m, loff_t *pos)
782 return *pos <= NR_CPUS ? (void *)((*pos)+1) : NULL;
784 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
787 return c_start(m, pos);
789 static void c_stop(struct seq_file *m, void *v)
792 struct seq_operations cpuinfo_op = {
796 .show = show_cpuinfo,
800 * These three variables are used to save values passed to us by prom_init()
801 * via the device tree. The TCE variables are needed because with a memory_limit
802 * in force we may need to explicitly map the TCE are at the top of RAM.
804 unsigned long memory_limit;
805 unsigned long tce_alloc_start;
806 unsigned long tce_alloc_end;
808 #ifdef CONFIG_PPC_ISERIES
810 * On iSeries we just parse the mem=X option from the command line.
811 * On pSeries it's a bit more complicated, see prom_init_mem()
813 static int __init early_parsemem(char *p)
818 memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
822 early_param("mem", early_parsemem);
823 #endif /* CONFIG_PPC_ISERIES */
825 #ifdef CONFIG_PPC_MULTIPLATFORM
826 static int __init set_preferred_console(void)
828 struct device_node *prom_stdout = NULL;
833 DBG(" -> set_preferred_console()\n");
835 /* The user has requested a console so this is already set up. */
836 if (strstr(saved_command_line, "console=")) {
837 DBG(" console was specified !\n");
842 DBG(" of_chosen is NULL !\n");
845 /* We are getting a weird phandle from OF ... */
846 /* ... So use the full path instead */
847 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
849 DBG(" no linux,stdout-path !\n");
852 prom_stdout = of_find_node_by_path(name);
854 DBG(" can't find stdout package %s !\n", name);
857 DBG("stdout is %s\n", prom_stdout->full_name);
859 name = (char *)get_property(prom_stdout, "name", NULL);
861 DBG(" stdout package has no name !\n");
864 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
868 #ifdef CONFIG_SERIAL_8250_CONSOLE
869 else if (strcmp(name, "serial") == 0) {
871 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
887 /* We dont recognise the serial port */
892 #endif /* CONFIG_SERIAL_8250_CONSOLE */
893 #ifdef CONFIG_PPC_PSERIES
894 else if (strcmp(name, "vty") == 0) {
895 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
896 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
898 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
899 /* Host Virtual Serial Interface */
911 of_node_put(prom_stdout);
912 DBG("Found hvsi console at offset %d\n", offset);
913 return add_preferred_console("hvsi", offset, NULL);
915 /* pSeries LPAR virtual console */
916 of_node_put(prom_stdout);
917 DBG("Found hvc console\n");
918 return add_preferred_console("hvc", 0, NULL);
921 #endif /* CONFIG_PPC_PSERIES */
922 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
923 else if (strcmp(name, "ch-a") == 0)
925 else if (strcmp(name, "ch-b") == 0)
927 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
930 of_node_put(prom_stdout);
932 DBG("Found serial console at ttyS%d\n", offset);
935 static char __initdata opt[16];
936 sprintf(opt, "%d", *spd);
937 return add_preferred_console("ttyS", offset, opt);
939 return add_preferred_console("ttyS", offset, NULL);
942 DBG("No preferred console found !\n");
943 of_node_put(prom_stdout);
946 console_initcall(set_preferred_console);
947 #endif /* CONFIG_PPC_MULTIPLATFORM */
949 #ifdef CONFIG_IRQSTACKS
950 static void __init irqstack_early_init(void)
955 * interrupt stacks must be under 256MB, we cannot afford to take
956 * SLB misses on them.
959 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
960 THREAD_SIZE, 0x10000000));
961 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
962 THREAD_SIZE, 0x10000000));
966 #define irqstack_early_init()
970 * Stack space used when we detect a bad kernel stack pointer, and
971 * early in SMP boots before relocation is enabled.
973 static void __init emergency_stack_init(void)
979 * Emergency stacks must be under 256MB, we cannot afford to take
980 * SLB misses on them. The ABI also requires them to be 128-byte
983 * Since we use these as temporary stacks during secondary CPU
984 * bringup, we need to get at them in real mode. This means they
985 * must also be within the RMO region.
987 limit = min(0x10000000UL, lmb.rmo_size);
990 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
995 * Called from setup_arch to initialize the bitmap of available
996 * syscalls in the systemcfg page
998 void __init setup_syscall_map(void)
1000 unsigned int i, count64 = 0, count32 = 0;
1001 extern unsigned long *sys_call_table;
1002 extern unsigned long *sys_call_table32;
1003 extern unsigned long sys_ni_syscall;
1006 for (i = 0; i < __NR_syscalls; i++) {
1007 if (sys_call_table[i] == sys_ni_syscall)
1010 systemcfg->syscall_map_64[i >> 5] |= 0x80000000UL >> (i & 0x1f);
1012 for (i = 0; i < __NR_syscalls; i++) {
1013 if (sys_call_table32[i] == sys_ni_syscall)
1016 systemcfg->syscall_map_32[i >> 5] |= 0x80000000UL >> (i & 0x1f);
1018 printk(KERN_INFO "Syscall map setup, %d 32 bits and %d 64 bits syscalls\n",
1023 * Called into from start_kernel, after lock_kernel has been called.
1024 * Initializes bootmem, which is unsed to manage page allocation until
1025 * mem_init is called.
1027 void __init setup_arch(char **cmdline_p)
1029 extern void do_init_bootmem(void);
1031 ppc64_boot_msg(0x12, "Setup Arch");
1033 *cmdline_p = cmd_line;
1036 * Set cache line size based on type of cpu as a default.
1037 * Systems with OF can look in the properties on the cpu node(s)
1038 * for a possibly more accurate value.
1040 dcache_bsize = ppc64_caches.dline_size;
1041 icache_bsize = ppc64_caches.iline_size;
1043 /* reboot on panic */
1044 panic_timeout = 180;
1047 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
1049 init_mm.start_code = PAGE_OFFSET;
1050 init_mm.end_code = (unsigned long) _etext;
1051 init_mm.end_data = (unsigned long) _edata;
1052 init_mm.brk = klimit;
1054 irqstack_early_init();
1055 emergency_stack_init();
1057 /* set up the bootmem stuff with available memory */
1060 /* initialize the syscall map in systemcfg */
1061 setup_syscall_map();
1063 ppc_md.setup_arch();
1065 /* Select the correct idle loop for the platform. */
1069 ppc64_boot_msg(0x15, "Setup Done");
1073 /* ToDo: do something useful if ppc_md is not yet setup. */
1074 #define PPC64_LINUX_FUNCTION 0x0f000000
1075 #define PPC64_IPL_MESSAGE 0xc0000000
1076 #define PPC64_TERM_MESSAGE 0xb0000000
1077 #define PPC64_ATTN_MESSAGE 0xa0000000
1078 #define PPC64_DUMP_MESSAGE 0xd0000000
1080 static void ppc64_do_msg(unsigned int src, const char *msg)
1082 if (ppc_md.progress) {
1085 sprintf(buf, "%08x \n", src);
1086 ppc_md.progress(buf, 0);
1087 sprintf(buf, "%-16s", msg);
1088 ppc_md.progress(buf, 0);
1092 /* Print a boot progress message. */
1093 void ppc64_boot_msg(unsigned int src, const char *msg)
1095 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
1096 printk("[boot]%04x %s\n", src, msg);
1099 /* Print a termination message (print only -- does not stop the kernel) */
1100 void ppc64_terminate_msg(unsigned int src, const char *msg)
1102 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
1103 printk("[terminate]%04x %s\n", src, msg);
1106 /* Print something that needs attention (device error, etc) */
1107 void ppc64_attention_msg(unsigned int src, const char *msg)
1109 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_ATTN_MESSAGE|src, msg);
1110 printk("[attention]%04x %s\n", src, msg);
1113 /* Print a dump progress message. */
1114 void ppc64_dump_msg(unsigned int src, const char *msg)
1116 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_DUMP_MESSAGE|src, msg);
1117 printk("[dump]%04x %s\n", src, msg);
1120 /* This should only be called on processor 0 during calibrate decr */
1121 void __init setup_default_decr(void)
1123 struct paca_struct *lpaca = get_paca();
1125 lpaca->default_decr = tb_ticks_per_jiffy;
1126 lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
1129 #ifndef CONFIG_PPC_ISERIES
1131 * This function can be used by platforms to "find" legacy serial ports.
1132 * It works for "serial" nodes under an "isa" node, and will try to
1133 * respect the "ibm,aix-loc" property if any. It works with up to 8
1137 #define MAX_LEGACY_SERIAL_PORTS 8
1138 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
1139 static unsigned int old_serial_count;
1141 void __init generic_find_legacy_serial_ports(u64 *physport,
1142 unsigned int *default_speed)
1144 struct device_node *np;
1147 struct isa_reg_property {
1152 struct pci_reg_property {
1153 struct pci_address addr;
1158 DBG(" -> generic_find_legacy_serial_port()\n");
1164 np = of_find_node_by_path("/");
1168 /* First fill our array */
1169 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
1170 struct device_node *isa, *pci;
1171 struct isa_reg_property *reg;
1172 unsigned long phys_size, addr_size, io_base;
1174 u32 *interrupts, *clk, *spd;
1176 int index, rlen, rentsize;
1178 /* Ok, first check if it's under an "isa" parent */
1179 isa = of_get_parent(np);
1180 if (!isa || strcmp(isa->name, "isa")) {
1181 DBG("%s: no isa parent found\n", np->full_name);
1185 /* Now look for an "ibm,aix-loc" property that gives us ordering
1188 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
1190 /* Get the ISA port number */
1191 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
1194 /* We assume the interrupt number isn't translated ... */
1195 interrupts = (u32 *)get_property(np, "interrupts", NULL);
1196 /* get clock freq. if present */
1197 clk = (u32 *)get_property(np, "clock-frequency", NULL);
1198 /* get default speed if present */
1199 spd = (u32 *)get_property(np, "current-speed", NULL);
1200 /* Default to locate at end of array */
1201 index = old_serial_count; /* end of the array by default */
1203 /* If we have a location index, then use it */
1204 if (typep && *typep == 'S') {
1205 index = simple_strtol(typep+1, NULL, 0) - 1;
1206 /* if index is out of range, use end of array instead */
1207 if (index >= MAX_LEGACY_SERIAL_PORTS)
1208 index = old_serial_count;
1209 /* if our index is still out of range, that mean that
1210 * array is full, we could scan for a free slot but that
1211 * make little sense to bother, just skip the port
1213 if (index >= MAX_LEGACY_SERIAL_PORTS)
1215 if (index >= old_serial_count)
1216 old_serial_count = index + 1;
1217 /* Check if there is a port who already claimed our slot */
1218 if (serial_ports[index].iobase != 0) {
1219 /* if we still have some room, move it, else override */
1220 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
1221 DBG("Moved legacy port %d -> %d\n", index,
1223 serial_ports[old_serial_count++] =
1224 serial_ports[index];
1226 DBG("Replacing legacy port %d\n", index);
1230 if (index >= MAX_LEGACY_SERIAL_PORTS)
1232 if (index >= old_serial_count)
1233 old_serial_count = index + 1;
1235 /* Now fill the entry */
1236 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
1237 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
1238 serial_ports[index].iobase = reg->address;
1239 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
1240 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
1242 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
1244 serial_ports[index].iobase,
1245 serial_ports[index].irq,
1246 serial_ports[index].uartclk);
1248 /* Get phys address of IO reg for port 1 */
1252 pci = of_get_parent(isa);
1254 DBG("%s: no pci parent found\n", np->full_name);
1258 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
1259 if (rangesp == NULL) {
1265 /* we need the #size-cells of the PCI bridge node itself */
1267 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
1268 if (sizeprop != NULL)
1269 phys_size = *sizeprop;
1270 /* we need the parent #addr-cells */
1271 addr_size = prom_n_addr_cells(pci);
1272 rentsize = 3 + addr_size + phys_size;
1274 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
1275 if (((rangesp[0] >> 24) & 0x3) != 1)
1276 continue; /* not IO space */
1277 io_base = rangesp[3];
1279 io_base = (io_base << 32) | rangesp[4];
1282 *physport = io_base + reg->address;
1283 if (default_speed && spd)
1284 *default_speed = *spd;
1291 DBG(" <- generic_find_legacy_serial_port()\n");
1294 static struct platform_device serial_device = {
1295 .name = "serial8250",
1298 .platform_data = serial_ports,
1302 static int __init serial_dev_init(void)
1304 return platform_device_register(&serial_device);
1306 arch_initcall(serial_dev_init);
1308 #endif /* CONFIG_PPC_ISERIES */
1310 int check_legacy_ioport(unsigned long base_port)
1312 if (ppc_md.check_legacy_ioport == NULL)
1314 return ppc_md.check_legacy_ioport(base_port);
1316 EXPORT_SYMBOL(check_legacy_ioport);
1319 static int __init early_xmon(char *p)
1321 /* ensure xmon is enabled */
1323 if (strncmp(p, "on", 2) == 0)
1325 if (strncmp(p, "early", 5) != 0)
1333 early_param("xmon", early_xmon);