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;
348 /* Ultimately, stuff them in an elf section like initcalls... */
349 static struct machdep_calls __initdata *machines[] = {
350 #ifdef CONFIG_PPC_PSERIES
352 #endif /* CONFIG_PPC_PSERIES */
353 #ifdef CONFIG_PPC_PMAC
355 #endif /* CONFIG_PPC_PMAC */
356 #ifdef CONFIG_PPC_MAPLE
358 #endif /* CONFIG_PPC_MAPLE */
363 * Early initialization entry point. This is called by head.S
364 * with MMU translation disabled. We rely on the "feature" of
365 * the CPU that ignores the top 2 bits of the address in real
366 * mode so we can access kernel globals normally provided we
367 * only toy with things in the RMO region. From here, we do
368 * some early parsing of the device-tree to setup out LMB
369 * data structures, and allocate & initialize the hash table
370 * and segment tables so we can start running with translation
373 * It is this function which will call the probe() callback of
374 * the various platform types and copy the matching one to the
375 * global ppc_md structure. Your platform can eventually do
376 * some very early initializations from the probe() routine, but
377 * this is not recommended, be very careful as, for example, the
378 * device-tree is not accessible via normal means at this point.
381 void __init early_setup(unsigned long dt_ptr)
383 struct paca_struct *lpaca = get_paca();
384 static struct machdep_calls **mach;
387 * Enable early debugging if any specified (see top of
392 DBG(" -> early_setup()\n");
395 * Fill the default DBG level (do we want to keep
396 * that old mecanism around forever ?)
401 * Do early initializations using the flattened device
402 * tree, like retreiving the physical memory map or
403 * calculating/retreiving the hash table size
405 early_init_devtree(__va(dt_ptr));
408 * Iterate all ppc_md structures until we find the proper
409 * one for the current machine type
411 DBG("Probing machine type for platform %x...\n",
412 systemcfg->platform);
414 for (mach = machines; *mach; mach++) {
415 if ((*mach)->probe(systemcfg->platform))
418 /* What can we do if we didn't find ? */
420 DBG("No suitable machine found !\n");
425 /* our udbg callbacks got overriden by the above, let's put them
426 * back in. Ultimately, I want those things to be split from the
431 DBG("Found, Initializing memory management...\n");
434 * Initialize stab / SLB management
436 stab_initialize(lpaca->stab_real);
439 * Initialize the MMU Hash table and create the linear mapping
444 DBG(" <- early_setup()\n");
449 * Initialize some remaining members of the ppc64_caches and systemcfg structures
450 * (at least until we get rid of them completely). This is mostly some
451 * cache informations about the CPU that will be used by cache flush
452 * routines and/or provided to userland
454 static void __init initialize_cache_info(void)
456 struct device_node *np;
457 unsigned long num_cpus = 0;
459 DBG(" -> initialize_cache_info()\n");
461 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
464 /* We're assuming *all* of the CPUs have the same
465 * d-cache and i-cache sizes... -Peter
468 if ( num_cpus == 1 ) {
473 /* Then read cache informations */
474 if (systemcfg->platform == PLATFORM_POWERMAC) {
475 dc = "d-cache-block-size";
476 ic = "i-cache-block-size";
478 dc = "d-cache-line-size";
479 ic = "i-cache-line-size";
483 lsize = cur_cpu_spec->dcache_bsize;
484 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
487 lsizep = (u32 *) get_property(np, dc, NULL);
490 if (sizep == 0 || lsizep == 0)
491 DBG("Argh, can't find dcache properties ! "
492 "sizep: %p, lsizep: %p\n", sizep, lsizep);
494 systemcfg->dcache_size = ppc64_caches.dsize = size;
495 systemcfg->dcache_line_size =
496 ppc64_caches.dline_size = lsize;
497 ppc64_caches.log_dline_size = __ilog2(lsize);
498 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
501 lsize = cur_cpu_spec->icache_bsize;
502 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
505 lsizep = (u32 *)get_property(np, ic, NULL);
508 if (sizep == 0 || lsizep == 0)
509 DBG("Argh, can't find icache properties ! "
510 "sizep: %p, lsizep: %p\n", sizep, lsizep);
512 systemcfg->icache_size = ppc64_caches.isize = size;
513 systemcfg->icache_line_size =
514 ppc64_caches.iline_size = lsize;
515 ppc64_caches.log_iline_size = __ilog2(lsize);
516 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
520 /* Add an eye catcher and the systemcfg layout version number */
521 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
522 systemcfg->version.major = SYSTEMCFG_MAJOR;
523 systemcfg->version.minor = SYSTEMCFG_MINOR;
524 systemcfg->processor = mfspr(SPRN_PVR);
526 DBG(" <- initialize_cache_info()\n");
529 static void __init check_for_initrd(void)
531 #ifdef CONFIG_BLK_DEV_INITRD
534 DBG(" -> check_for_initrd()\n");
536 prop = (u64 *)get_property(of_chosen, "linux,initrd-start", NULL);
538 initrd_start = (unsigned long)__va(*prop);
539 prop = (u64 *)get_property(of_chosen, "linux,initrd-end", NULL);
541 initrd_end = (unsigned long)__va(*prop);
542 initrd_below_start_ok = 1;
547 /* If we were passed an initrd, set the ROOT_DEV properly if the values
548 * look sensible. If not, clear initrd reference.
550 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
551 initrd_end > initrd_start)
552 ROOT_DEV = Root_RAM0;
554 initrd_start = initrd_end = 0;
557 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
559 DBG(" <- check_for_initrd()\n");
560 #endif /* CONFIG_BLK_DEV_INITRD */
563 #endif /* CONFIG_PPC_MULTIPLATFORM */
566 * Do some initial setup of the system. The parameters are those which
567 * were passed in from the bootloader.
569 void __init setup_system(void)
571 DBG(" -> setup_system()\n");
573 #ifdef CONFIG_PPC_ISERIES
574 /* pSeries systems are identified in prom.c via OF. */
575 if (itLpNaca.xLparInstalled == 1)
576 systemcfg->platform = PLATFORM_ISERIES_LPAR;
579 #else /* CONFIG_PPC_ISERIES */
582 * Unflatten the device-tree passed by prom_init or kexec
584 unflatten_device_tree();
587 * Fill the ppc64_caches & systemcfg structures with informations
588 * retreived from the device-tree. Need to be called before
589 * finish_device_tree() since the later requires some of the
590 * informations filled up here to properly parse the interrupt
592 * It also sets up the cache line sizes which allows to call
593 * routines like flush_icache_range (used by the hash init
596 initialize_cache_info();
598 #ifdef CONFIG_PPC_RTAS
600 * Initialize RTAS if available
603 #endif /* CONFIG_PPC_RTAS */
606 * Check if we have an initrd provided via the device-tree
611 * Do some platform specific early initializations, that includes
612 * setting up the hash table pointers. It also sets up some interrupt-mapping
613 * related options that will be used by finish_device_tree()
618 * "Finish" the device-tree, that is do the actual parsing of
619 * some of the properties like the interrupt map
621 finish_device_tree();
626 #ifdef CONFIG_XMON_DEFAULT
630 * Register early console
632 early_console_initialized = 1;
633 register_console(&udbg_console);
635 /* Save unparsed command line copy for /proc/cmdline */
636 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
639 #endif /* !CONFIG_PPC_ISERIES */
641 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES)
643 * iSeries has already initialized the cpu maps at this point.
647 /* Release secondary cpus out of their spinloops at 0x60 now that
648 * we can map physical -> logical CPU ids
651 #endif /* defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES) */
653 printk("Starting Linux PPC64 %s\n", UTS_RELEASE);
655 printk("-----------------------------------------------------\n");
656 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
657 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
658 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
659 printk("systemcfg = 0x%p\n", systemcfg);
660 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
661 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
662 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
663 printk("ppc64_caches.dcache_line_size = 0x%x\n",
664 ppc64_caches.dline_size);
665 printk("ppc64_caches.icache_line_size = 0x%x\n",
666 ppc64_caches.iline_size);
667 printk("htab_address = 0x%p\n", htab_address);
668 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
669 printk("-----------------------------------------------------\n");
673 DBG(" <- setup_system()\n");
677 void machine_restart(char *cmd)
679 if (ppc_md.nvram_sync)
684 EXPORT_SYMBOL(machine_restart);
686 void machine_power_off(void)
688 if (ppc_md.nvram_sync)
693 EXPORT_SYMBOL(machine_power_off);
695 void machine_halt(void)
697 if (ppc_md.nvram_sync)
702 EXPORT_SYMBOL(machine_halt);
704 unsigned long ppc_proc_freq;
705 unsigned long ppc_tb_freq;
707 static int ppc64_panic_event(struct notifier_block *this,
708 unsigned long event, void *ptr)
710 ppc_md.panic((char *)ptr); /* May not return */
716 DEFINE_PER_CPU(unsigned int, pvr);
719 static int show_cpuinfo(struct seq_file *m, void *v)
721 unsigned long cpu_id = (unsigned long)v - 1;
726 if (cpu_id == NR_CPUS) {
727 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
729 if (ppc_md.get_cpuinfo != NULL)
730 ppc_md.get_cpuinfo(m);
735 /* We only show online cpus: disable preempt (overzealous, I
736 * knew) to prevent cpu going down. */
738 if (!cpu_online(cpu_id)) {
744 pvr = per_cpu(pvr, cpu_id);
746 pvr = mfspr(SPRN_PVR);
748 maj = (pvr >> 8) & 0xFF;
751 seq_printf(m, "processor\t: %lu\n", cpu_id);
752 seq_printf(m, "cpu\t\t: ");
754 if (cur_cpu_spec->pvr_mask)
755 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
757 seq_printf(m, "unknown (%08x)", pvr);
759 #ifdef CONFIG_ALTIVEC
760 if (cpu_has_feature(CPU_FTR_ALTIVEC))
761 seq_printf(m, ", altivec supported");
762 #endif /* CONFIG_ALTIVEC */
767 * Assume here that all clock rates are the same in a
768 * smp system. -- Cort
770 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
771 ppc_proc_freq % 1000000);
773 seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);
779 static void *c_start(struct seq_file *m, loff_t *pos)
781 return *pos <= NR_CPUS ? (void *)((*pos)+1) : NULL;
783 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
786 return c_start(m, pos);
788 static void c_stop(struct seq_file *m, void *v)
791 struct seq_operations cpuinfo_op = {
795 .show = show_cpuinfo,
799 * These three variables are used to save values passed to us by prom_init()
800 * via the device tree. The TCE variables are needed because with a memory_limit
801 * in force we may need to explicitly map the TCE are at the top of RAM.
803 unsigned long memory_limit;
804 unsigned long tce_alloc_start;
805 unsigned long tce_alloc_end;
807 #ifdef CONFIG_PPC_ISERIES
809 * On iSeries we just parse the mem=X option from the command line.
810 * On pSeries it's a bit more complicated, see prom_init_mem()
812 static int __init early_parsemem(char *p)
817 memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
821 early_param("mem", early_parsemem);
822 #endif /* CONFIG_PPC_ISERIES */
824 #ifdef CONFIG_PPC_MULTIPLATFORM
825 static int __init set_preferred_console(void)
827 struct device_node *prom_stdout = NULL;
832 DBG(" -> set_preferred_console()\n");
834 /* The user has requested a console so this is already set up. */
835 if (strstr(saved_command_line, "console=")) {
836 DBG(" console was specified !\n");
841 DBG(" of_chosen is NULL !\n");
844 /* We are getting a weird phandle from OF ... */
845 /* ... So use the full path instead */
846 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
848 DBG(" no linux,stdout-path !\n");
851 prom_stdout = of_find_node_by_path(name);
853 DBG(" can't find stdout package %s !\n", name);
856 DBG("stdout is %s\n", prom_stdout->full_name);
858 name = (char *)get_property(prom_stdout, "name", NULL);
860 DBG(" stdout package has no name !\n");
863 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
867 #ifdef CONFIG_SERIAL_8250_CONSOLE
868 else if (strcmp(name, "serial") == 0) {
870 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
886 /* We dont recognise the serial port */
891 #endif /* CONFIG_SERIAL_8250_CONSOLE */
892 #ifdef CONFIG_PPC_PSERIES
893 else if (strcmp(name, "vty") == 0) {
894 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
895 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
897 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
898 /* Host Virtual Serial Interface */
910 of_node_put(prom_stdout);
911 DBG("Found hvsi console at offset %d\n", offset);
912 return add_preferred_console("hvsi", offset, NULL);
914 /* pSeries LPAR virtual console */
915 of_node_put(prom_stdout);
916 DBG("Found hvc console\n");
917 return add_preferred_console("hvc", 0, NULL);
920 #endif /* CONFIG_PPC_PSERIES */
921 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
922 else if (strcmp(name, "ch-a") == 0)
924 else if (strcmp(name, "ch-b") == 0)
926 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
929 of_node_put(prom_stdout);
931 DBG("Found serial console at ttyS%d\n", offset);
934 static char __initdata opt[16];
935 sprintf(opt, "%d", *spd);
936 return add_preferred_console("ttyS", offset, opt);
938 return add_preferred_console("ttyS", offset, NULL);
941 DBG("No preferred console found !\n");
942 of_node_put(prom_stdout);
945 console_initcall(set_preferred_console);
946 #endif /* CONFIG_PPC_MULTIPLATFORM */
948 #ifdef CONFIG_IRQSTACKS
949 static void __init irqstack_early_init(void)
954 * interrupt stacks must be under 256MB, we cannot afford to take
955 * SLB misses on them.
958 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
959 THREAD_SIZE, 0x10000000));
960 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
961 THREAD_SIZE, 0x10000000));
965 #define irqstack_early_init()
969 * Stack space used when we detect a bad kernel stack pointer, and
970 * early in SMP boots before relocation is enabled.
972 static void __init emergency_stack_init(void)
978 * Emergency stacks must be under 256MB, we cannot afford to take
979 * SLB misses on them. The ABI also requires them to be 128-byte
982 * Since we use these as temporary stacks during secondary CPU
983 * bringup, we need to get at them in real mode. This means they
984 * must also be within the RMO region.
986 limit = min(0x10000000UL, lmb.rmo_size);
989 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
994 * Called from setup_arch to initialize the bitmap of available
995 * syscalls in the systemcfg page
997 void __init setup_syscall_map(void)
999 unsigned int i, count64 = 0, count32 = 0;
1000 extern unsigned long *sys_call_table;
1001 extern unsigned long *sys_call_table32;
1002 extern unsigned long sys_ni_syscall;
1005 for (i = 0; i < __NR_syscalls; i++) {
1006 if (sys_call_table[i] == sys_ni_syscall)
1009 systemcfg->syscall_map_64[i >> 5] |= 0x80000000UL >> (i & 0x1f);
1011 for (i = 0; i < __NR_syscalls; i++) {
1012 if (sys_call_table32[i] == sys_ni_syscall)
1015 systemcfg->syscall_map_32[i >> 5] |= 0x80000000UL >> (i & 0x1f);
1017 printk(KERN_INFO "Syscall map setup, %d 32 bits and %d 64 bits syscalls\n",
1022 * Called into from start_kernel, after lock_kernel has been called.
1023 * Initializes bootmem, which is unsed to manage page allocation until
1024 * mem_init is called.
1026 void __init setup_arch(char **cmdline_p)
1028 extern void do_init_bootmem(void);
1030 ppc64_boot_msg(0x12, "Setup Arch");
1032 *cmdline_p = cmd_line;
1035 * Set cache line size based on type of cpu as a default.
1036 * Systems with OF can look in the properties on the cpu node(s)
1037 * for a possibly more accurate value.
1039 dcache_bsize = ppc64_caches.dline_size;
1040 icache_bsize = ppc64_caches.iline_size;
1042 /* reboot on panic */
1043 panic_timeout = 180;
1046 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
1048 init_mm.start_code = PAGE_OFFSET;
1049 init_mm.end_code = (unsigned long) _etext;
1050 init_mm.end_data = (unsigned long) _edata;
1051 init_mm.brk = klimit;
1053 irqstack_early_init();
1054 emergency_stack_init();
1056 /* set up the bootmem stuff with available memory */
1059 /* initialize the syscall map in systemcfg */
1060 setup_syscall_map();
1062 ppc_md.setup_arch();
1064 /* Select the correct idle loop for the platform. */
1068 ppc64_boot_msg(0x15, "Setup Done");
1072 /* ToDo: do something useful if ppc_md is not yet setup. */
1073 #define PPC64_LINUX_FUNCTION 0x0f000000
1074 #define PPC64_IPL_MESSAGE 0xc0000000
1075 #define PPC64_TERM_MESSAGE 0xb0000000
1076 #define PPC64_ATTN_MESSAGE 0xa0000000
1077 #define PPC64_DUMP_MESSAGE 0xd0000000
1079 static void ppc64_do_msg(unsigned int src, const char *msg)
1081 if (ppc_md.progress) {
1084 sprintf(buf, "%08x \n", src);
1085 ppc_md.progress(buf, 0);
1086 sprintf(buf, "%-16s", msg);
1087 ppc_md.progress(buf, 0);
1091 /* Print a boot progress message. */
1092 void ppc64_boot_msg(unsigned int src, const char *msg)
1094 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
1095 printk("[boot]%04x %s\n", src, msg);
1098 /* Print a termination message (print only -- does not stop the kernel) */
1099 void ppc64_terminate_msg(unsigned int src, const char *msg)
1101 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
1102 printk("[terminate]%04x %s\n", src, msg);
1105 /* Print something that needs attention (device error, etc) */
1106 void ppc64_attention_msg(unsigned int src, const char *msg)
1108 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_ATTN_MESSAGE|src, msg);
1109 printk("[attention]%04x %s\n", src, msg);
1112 /* Print a dump progress message. */
1113 void ppc64_dump_msg(unsigned int src, const char *msg)
1115 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_DUMP_MESSAGE|src, msg);
1116 printk("[dump]%04x %s\n", src, msg);
1119 /* This should only be called on processor 0 during calibrate decr */
1120 void setup_default_decr(void)
1122 struct paca_struct *lpaca = get_paca();
1124 lpaca->default_decr = tb_ticks_per_jiffy;
1125 lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
1128 #ifndef CONFIG_PPC_ISERIES
1130 * This function can be used by platforms to "find" legacy serial ports.
1131 * It works for "serial" nodes under an "isa" node, and will try to
1132 * respect the "ibm,aix-loc" property if any. It works with up to 8
1136 #define MAX_LEGACY_SERIAL_PORTS 8
1137 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
1138 static unsigned int old_serial_count;
1140 void __init generic_find_legacy_serial_ports(u64 *physport,
1141 unsigned int *default_speed)
1143 struct device_node *np;
1146 struct isa_reg_property {
1151 struct pci_reg_property {
1152 struct pci_address addr;
1157 DBG(" -> generic_find_legacy_serial_port()\n");
1163 np = of_find_node_by_path("/");
1167 /* First fill our array */
1168 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
1169 struct device_node *isa, *pci;
1170 struct isa_reg_property *reg;
1171 unsigned long phys_size, addr_size, io_base;
1173 u32 *interrupts, *clk, *spd;
1175 int index, rlen, rentsize;
1177 /* Ok, first check if it's under an "isa" parent */
1178 isa = of_get_parent(np);
1179 if (!isa || strcmp(isa->name, "isa")) {
1180 DBG("%s: no isa parent found\n", np->full_name);
1184 /* Now look for an "ibm,aix-loc" property that gives us ordering
1187 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
1189 /* Get the ISA port number */
1190 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
1193 /* We assume the interrupt number isn't translated ... */
1194 interrupts = (u32 *)get_property(np, "interrupts", NULL);
1195 /* get clock freq. if present */
1196 clk = (u32 *)get_property(np, "clock-frequency", NULL);
1197 /* get default speed if present */
1198 spd = (u32 *)get_property(np, "current-speed", NULL);
1199 /* Default to locate at end of array */
1200 index = old_serial_count; /* end of the array by default */
1202 /* If we have a location index, then use it */
1203 if (typep && *typep == 'S') {
1204 index = simple_strtol(typep+1, NULL, 0) - 1;
1205 /* if index is out of range, use end of array instead */
1206 if (index >= MAX_LEGACY_SERIAL_PORTS)
1207 index = old_serial_count;
1208 /* if our index is still out of range, that mean that
1209 * array is full, we could scan for a free slot but that
1210 * make little sense to bother, just skip the port
1212 if (index >= MAX_LEGACY_SERIAL_PORTS)
1214 if (index >= old_serial_count)
1215 old_serial_count = index + 1;
1216 /* Check if there is a port who already claimed our slot */
1217 if (serial_ports[index].iobase != 0) {
1218 /* if we still have some room, move it, else override */
1219 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
1220 DBG("Moved legacy port %d -> %d\n", index,
1222 serial_ports[old_serial_count++] =
1223 serial_ports[index];
1225 DBG("Replacing legacy port %d\n", index);
1229 if (index >= MAX_LEGACY_SERIAL_PORTS)
1231 if (index >= old_serial_count)
1232 old_serial_count = index + 1;
1234 /* Now fill the entry */
1235 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
1236 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
1237 serial_ports[index].iobase = reg->address;
1238 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
1239 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
1241 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
1243 serial_ports[index].iobase,
1244 serial_ports[index].irq,
1245 serial_ports[index].uartclk);
1247 /* Get phys address of IO reg for port 1 */
1251 pci = of_get_parent(isa);
1253 DBG("%s: no pci parent found\n", np->full_name);
1257 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
1258 if (rangesp == NULL) {
1264 /* we need the #size-cells of the PCI bridge node itself */
1266 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
1267 if (sizeprop != NULL)
1268 phys_size = *sizeprop;
1269 /* we need the parent #addr-cells */
1270 addr_size = prom_n_addr_cells(pci);
1271 rentsize = 3 + addr_size + phys_size;
1273 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
1274 if (((rangesp[0] >> 24) & 0x3) != 1)
1275 continue; /* not IO space */
1276 io_base = rangesp[3];
1278 io_base = (io_base << 32) | rangesp[4];
1281 *physport = io_base + reg->address;
1282 if (default_speed && spd)
1283 *default_speed = *spd;
1290 DBG(" <- generic_find_legacy_serial_port()\n");
1293 static struct platform_device serial_device = {
1294 .name = "serial8250",
1297 .platform_data = serial_ports,
1301 static int __init serial_dev_init(void)
1303 return platform_device_register(&serial_device);
1305 arch_initcall(serial_dev_init);
1307 #endif /* CONFIG_PPC_ISERIES */
1309 int check_legacy_ioport(unsigned long base_port)
1311 if (ppc_md.check_legacy_ioport == NULL)
1313 return ppc_md.check_legacy_ioport(base_port);
1315 EXPORT_SYMBOL(check_legacy_ioport);
1318 static int __init early_xmon(char *p)
1320 /* ensure xmon is enabled */
1322 if (strncmp(p, "on", 2) == 0)
1324 if (strncmp(p, "early", 5) != 0)
1332 early_param("xmon", early_xmon);