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>
44 #include <asm/iSeries/LparData.h>
46 #include <asm/ppcdebug.h>
48 #include <asm/cputable.h>
49 #include <asm/sections.h>
50 #include <asm/btext.h>
51 #include <asm/nvram.h>
52 #include <asm/setup.h>
53 #include <asm/system.h>
55 #include <asm/iommu.h>
56 #include <asm/serial.h>
57 #include <asm/cache.h>
62 #define DBG(fmt...) udbg_printf(fmt)
68 * Here are some early debugging facilities. You can enable one
69 * but your kernel will not boot on anything else if you do so
72 /* This one is for use on LPAR machines that support an HVC console
75 extern void udbg_init_debug_lpar(void);
76 /* This one is for use on Apple G5 machines
78 extern void udbg_init_pmac_realmode(void);
79 /* That's RTAS panel debug */
80 extern void call_rtas_display_status_delay(unsigned char c);
81 /* Here's maple real mode debug */
82 extern void udbg_init_maple_realmode(void);
84 #define EARLY_DEBUG_INIT() do {} while(0)
87 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
88 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
89 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
90 #define EARLY_DEBUG_INIT() \
91 do { ppc_md.udbg_putc = call_rtas_display_status_delay; } while(0)
94 /* extern void *stab; */
95 extern unsigned long klimit;
97 extern void mm_init_ppc64(void);
98 extern int idle_setup(void);
99 extern void stab_initialize(unsigned long stab);
100 extern void htab_initialize(void);
101 extern void early_init_devtree(void *flat_dt);
102 extern void unflatten_device_tree(void);
104 extern void smp_release_cpus(void);
106 unsigned long decr_overclock = 1;
107 unsigned long decr_overclock_proc0 = 1;
108 unsigned long decr_overclock_set = 0;
109 unsigned long decr_overclock_proc0_set = 0;
113 int boot_cpuid_phys = 0;
116 u64 ppc64_debug_switch;
118 struct ppc64_caches ppc64_caches;
119 EXPORT_SYMBOL_GPL(ppc64_caches);
122 * These are used in binfmt_elf.c to put aux entries on the stack
123 * for each elf executable being started.
129 /* The main machine-dep calls structure
131 struct machdep_calls ppc_md;
133 #ifdef CONFIG_MAGIC_SYSRQ
134 unsigned long SYSRQ_KEY;
135 #endif /* CONFIG_MAGIC_SYSRQ */
138 static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
139 static struct notifier_block ppc64_panic_block = {
140 .notifier_call = ppc64_panic_event,
141 .priority = INT_MIN /* may not return; must be done last */
145 * Perhaps we can put the pmac screen_info[] here
146 * on pmac as well so we don't need the ifdef's.
147 * Until we get multiple-console support in here
149 * Maybe tie it to serial consoles, since this is really what
150 * these processors use on existing boards. -- Dan
152 struct screen_info screen_info = {
155 .orig_video_cols = 80,
156 .orig_video_lines = 25,
157 .orig_video_isVGA = 1,
158 .orig_video_points = 16
162 * Initialize the PPCDBG state. Called before relocation has been enabled.
164 void __init ppcdbg_initialize(void)
166 ppc64_debug_switch = PPC_DEBUG_DEFAULT; /* | PPCDBG_BUSWALK | */
167 /* PPCDBG_PHBINIT | PPCDBG_MM | PPCDBG_MMINIT | PPCDBG_TCEINIT | PPCDBG_TCE */;
171 * Early boot console based on udbg
173 static struct console udbg_console = {
175 .write = udbg_console_write,
176 .flags = CON_PRINTBUFFER,
179 static int early_console_initialized;
181 void __init disable_early_printk(void)
183 if (!early_console_initialized)
185 unregister_console(&udbg_console);
186 early_console_initialized = 0;
189 #if defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP)
191 static int smt_enabled_cmdline;
193 /* Look for ibm,smt-enabled OF option */
194 static void check_smt_enabled(void)
196 struct device_node *dn;
199 /* Allow the command line to overrule the OF option */
200 if (smt_enabled_cmdline)
203 dn = of_find_node_by_path("/options");
206 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
209 if (!strcmp(smt_option, "on"))
210 smt_enabled_at_boot = 1;
211 else if (!strcmp(smt_option, "off"))
212 smt_enabled_at_boot = 0;
217 /* Look for smt-enabled= cmdline option */
218 static int __init early_smt_enabled(char *p)
220 smt_enabled_cmdline = 1;
225 if (!strcmp(p, "on") || !strcmp(p, "1"))
226 smt_enabled_at_boot = 1;
227 else if (!strcmp(p, "off") || !strcmp(p, "0"))
228 smt_enabled_at_boot = 0;
232 early_param("smt-enabled", early_smt_enabled);
235 * setup_cpu_maps - initialize the following cpu maps:
240 * Having the possible map set up early allows us to restrict allocations
241 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
243 * We do not initialize the online map here; cpus set their own bits in
244 * cpu_online_map as they come up.
246 * This function is valid only for Open Firmware systems. finish_device_tree
247 * must be called before using this.
249 * While we're here, we may as well set the "physical" cpu ids in the paca.
251 static void __init setup_cpu_maps(void)
253 struct device_node *dn = NULL;
259 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
261 int j, len = sizeof(u32), nthreads;
263 intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
266 intserv = (u32 *)get_property(dn, "reg", NULL);
268 nthreads = len / sizeof(u32);
270 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
272 * Only spin up secondary threads if SMT is enabled.
273 * We must leave space in the logical map for the
276 if (j == 0 || smt_enabled_at_boot) {
277 cpu_set(cpu, cpu_present_map);
278 set_hard_smp_processor_id(cpu, intserv[j]);
280 if (intserv[j] == boot_cpuid_phys)
282 cpu_set(cpu, cpu_possible_map);
287 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
288 * boot cpu is logical 0.
290 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
292 tmp = get_hard_smp_processor_id(0);
293 set_hard_smp_processor_id(0, boot_cpuid_phys);
294 set_hard_smp_processor_id(swap_cpuid, tmp);
298 * On pSeries LPAR, we need to know how many cpus
299 * could possibly be added to this partition.
301 if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
302 (dn = of_find_node_by_path("/rtas"))) {
303 int num_addr_cell, num_size_cell, maxcpus;
306 num_addr_cell = prom_n_addr_cells(dn);
307 num_size_cell = prom_n_size_cells(dn);
309 ireg = (unsigned int *)
310 get_property(dn, "ibm,lrdr-capacity", NULL);
315 maxcpus = ireg[num_addr_cell + num_size_cell];
317 /* Double maxcpus for processors which have SMT capability */
318 if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
321 if (maxcpus > NR_CPUS) {
323 "Partition configured for %d cpus, "
324 "operating system maximum is %d.\n",
328 printk(KERN_INFO "Partition configured for %d cpus.\n",
331 for (cpu = 0; cpu < maxcpus; cpu++)
332 cpu_set(cpu, cpu_possible_map);
338 * Do the sibling map; assume only two threads per processor.
341 cpu_set(cpu, cpu_sibling_map[cpu]);
342 if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
343 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
346 systemcfg->processorCount = num_present_cpus();
348 #endif /* defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP) */
351 #ifdef CONFIG_PPC_MULTIPLATFORM
353 extern struct machdep_calls pSeries_md;
354 extern struct machdep_calls pmac_md;
355 extern struct machdep_calls maple_md;
357 /* Ultimately, stuff them in an elf section like initcalls... */
358 static struct machdep_calls __initdata *machines[] = {
359 #ifdef CONFIG_PPC_PSERIES
361 #endif /* CONFIG_PPC_PSERIES */
362 #ifdef CONFIG_PPC_PMAC
364 #endif /* CONFIG_PPC_PMAC */
365 #ifdef CONFIG_PPC_MAPLE
367 #endif /* CONFIG_PPC_MAPLE */
372 * Early initialization entry point. This is called by head.S
373 * with MMU translation disabled. We rely on the "feature" of
374 * the CPU that ignores the top 2 bits of the address in real
375 * mode so we can access kernel globals normally provided we
376 * only toy with things in the RMO region. From here, we do
377 * some early parsing of the device-tree to setup out LMB
378 * data structures, and allocate & initialize the hash table
379 * and segment tables so we can start running with translation
382 * It is this function which will call the probe() callback of
383 * the various platform types and copy the matching one to the
384 * global ppc_md structure. Your platform can eventually do
385 * some very early initializations from the probe() routine, but
386 * this is not recommended, be very careful as, for example, the
387 * device-tree is not accessible via normal means at this point.
390 void __init early_setup(unsigned long dt_ptr)
392 struct paca_struct *lpaca = get_paca();
393 static struct machdep_calls **mach;
396 * Enable early debugging if any specified (see top of
401 DBG(" -> early_setup()\n");
404 * Fill the default DBG level (do we want to keep
405 * that old mecanism around forever ?)
410 * Do early initializations using the flattened device
411 * tree, like retreiving the physical memory map or
412 * calculating/retreiving the hash table size
414 early_init_devtree(__va(dt_ptr));
417 * Iterate all ppc_md structures until we find the proper
418 * one for the current machine type
420 DBG("Probing machine type for platform %x...\n",
421 systemcfg->platform);
423 for (mach = machines; *mach; mach++) {
424 if ((*mach)->probe(systemcfg->platform))
427 /* What can we do if we didn't find ? */
429 DBG("No suitable machine found !\n");
434 /* our udbg callbacks got overriden by the above, let's put them
435 * back in. Ultimately, I want those things to be split from the
440 DBG("Found, Initializing memory management...\n");
443 * Initialize stab / SLB management
445 stab_initialize(lpaca->stab_real);
448 * Initialize the MMU Hash table and create the linear mapping
453 DBG(" <- early_setup()\n");
458 * Initialize some remaining members of the ppc64_caches and systemcfg structures
459 * (at least until we get rid of them completely). This is mostly some
460 * cache informations about the CPU that will be used by cache flush
461 * routines and/or provided to userland
463 static void __init initialize_cache_info(void)
465 struct device_node *np;
466 unsigned long num_cpus = 0;
468 DBG(" -> initialize_cache_info()\n");
470 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
473 /* We're assuming *all* of the CPUs have the same
474 * d-cache and i-cache sizes... -Peter
477 if ( num_cpus == 1 ) {
482 /* Then read cache informations */
483 if (systemcfg->platform == PLATFORM_POWERMAC) {
484 dc = "d-cache-block-size";
485 ic = "i-cache-block-size";
487 dc = "d-cache-line-size";
488 ic = "i-cache-line-size";
492 lsize = cur_cpu_spec->dcache_bsize;
493 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
496 lsizep = (u32 *) get_property(np, dc, NULL);
499 if (sizep == 0 || lsizep == 0)
500 DBG("Argh, can't find dcache properties ! "
501 "sizep: %p, lsizep: %p\n", sizep, lsizep);
503 systemcfg->dcache_size = ppc64_caches.dsize = size;
504 systemcfg->dcache_line_size =
505 ppc64_caches.dline_size = lsize;
506 ppc64_caches.log_dline_size = __ilog2(lsize);
507 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
510 lsize = cur_cpu_spec->icache_bsize;
511 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
514 lsizep = (u32 *)get_property(np, ic, NULL);
517 if (sizep == 0 || lsizep == 0)
518 DBG("Argh, can't find icache properties ! "
519 "sizep: %p, lsizep: %p\n", sizep, lsizep);
521 systemcfg->icache_size = ppc64_caches.isize = size;
522 systemcfg->icache_line_size =
523 ppc64_caches.iline_size = lsize;
524 ppc64_caches.log_iline_size = __ilog2(lsize);
525 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
529 /* Add an eye catcher and the systemcfg layout version number */
530 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
531 systemcfg->version.major = SYSTEMCFG_MAJOR;
532 systemcfg->version.minor = SYSTEMCFG_MINOR;
533 systemcfg->processor = mfspr(SPRN_PVR);
535 DBG(" <- initialize_cache_info()\n");
538 static void __init check_for_initrd(void)
540 #ifdef CONFIG_BLK_DEV_INITRD
543 DBG(" -> check_for_initrd()\n");
545 prop = (u64 *)get_property(of_chosen, "linux,initrd-start", NULL);
547 initrd_start = (unsigned long)__va(*prop);
548 prop = (u64 *)get_property(of_chosen, "linux,initrd-end", NULL);
550 initrd_end = (unsigned long)__va(*prop);
551 initrd_below_start_ok = 1;
556 /* If we were passed an initrd, set the ROOT_DEV properly if the values
557 * look sensible. If not, clear initrd reference.
559 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
560 initrd_end > initrd_start)
561 ROOT_DEV = Root_RAM0;
563 initrd_start = initrd_end = 0;
566 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
568 DBG(" <- check_for_initrd()\n");
569 #endif /* CONFIG_BLK_DEV_INITRD */
572 #endif /* CONFIG_PPC_MULTIPLATFORM */
575 * Do some initial setup of the system. The parameters are those which
576 * were passed in from the bootloader.
578 void __init setup_system(void)
580 DBG(" -> setup_system()\n");
582 #ifdef CONFIG_PPC_ISERIES
583 /* pSeries systems are identified in prom.c via OF. */
584 if (itLpNaca.xLparInstalled == 1)
585 systemcfg->platform = PLATFORM_ISERIES_LPAR;
588 #else /* CONFIG_PPC_ISERIES */
591 * Unflatten the device-tree passed by prom_init or kexec
593 unflatten_device_tree();
596 * Fill the ppc64_caches & systemcfg structures with informations
597 * retreived from the device-tree. Need to be called before
598 * finish_device_tree() since the later requires some of the
599 * informations filled up here to properly parse the interrupt
601 * It also sets up the cache line sizes which allows to call
602 * routines like flush_icache_range (used by the hash init
605 initialize_cache_info();
607 #ifdef CONFIG_PPC_PSERIES
609 * Initialize RTAS if available
612 #endif /* CONFIG_PPC_PSERIES */
615 * Check if we have an initrd provided via the device-tree
620 * Do some platform specific early initializations, that includes
621 * setting up the hash table pointers. It also sets up some interrupt-mapping
622 * related options that will be used by finish_device_tree()
627 * "Finish" the device-tree, that is do the actual parsing of
628 * some of the properties like the interrupt map
630 finish_device_tree();
635 #ifdef CONFIG_XMON_DEFAULT
639 * Register early console
641 early_console_initialized = 1;
642 register_console(&udbg_console);
644 #endif /* !CONFIG_PPC_ISERIES */
646 /* Save unparsed command line copy for /proc/cmdline */
647 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
651 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES)
653 * iSeries has already initialized the cpu maps at this point.
657 /* Release secondary cpus out of their spinloops at 0x60 now that
658 * we can map physical -> logical CPU ids
661 #endif /* defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES) */
663 printk("Starting Linux PPC64 %s\n", UTS_RELEASE);
665 printk("-----------------------------------------------------\n");
666 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
667 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
668 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
669 printk("systemcfg = 0x%p\n", systemcfg);
670 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
671 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
672 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
673 printk("ppc64_caches.dcache_line_size = 0x%x\n",
674 ppc64_caches.dline_size);
675 printk("ppc64_caches.icache_line_size = 0x%x\n",
676 ppc64_caches.iline_size);
677 printk("htab_address = 0x%p\n", htab_address);
678 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
679 printk("-----------------------------------------------------\n");
683 DBG(" <- setup_system()\n");
687 void machine_restart(char *cmd)
689 if (ppc_md.nvram_sync)
694 EXPORT_SYMBOL(machine_restart);
696 void machine_power_off(void)
698 if (ppc_md.nvram_sync)
703 EXPORT_SYMBOL(machine_power_off);
705 void machine_halt(void)
707 if (ppc_md.nvram_sync)
712 EXPORT_SYMBOL(machine_halt);
714 unsigned long ppc_proc_freq;
715 unsigned long ppc_tb_freq;
717 static int ppc64_panic_event(struct notifier_block *this,
718 unsigned long event, void *ptr)
720 ppc_md.panic((char *)ptr); /* May not return */
726 DEFINE_PER_CPU(unsigned int, pvr);
729 static int show_cpuinfo(struct seq_file *m, void *v)
731 unsigned long cpu_id = (unsigned long)v - 1;
736 if (cpu_id == NR_CPUS) {
737 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
739 if (ppc_md.get_cpuinfo != NULL)
740 ppc_md.get_cpuinfo(m);
745 /* We only show online cpus: disable preempt (overzealous, I
746 * knew) to prevent cpu going down. */
748 if (!cpu_online(cpu_id)) {
754 pvr = per_cpu(pvr, cpu_id);
756 pvr = mfspr(SPRN_PVR);
758 maj = (pvr >> 8) & 0xFF;
761 seq_printf(m, "processor\t: %lu\n", cpu_id);
762 seq_printf(m, "cpu\t\t: ");
764 if (cur_cpu_spec->pvr_mask)
765 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
767 seq_printf(m, "unknown (%08x)", pvr);
769 #ifdef CONFIG_ALTIVEC
770 if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
771 seq_printf(m, ", altivec supported");
772 #endif /* CONFIG_ALTIVEC */
777 * Assume here that all clock rates are the same in a
778 * smp system. -- Cort
780 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
781 ppc_proc_freq % 1000000);
783 seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);
789 static void *c_start(struct seq_file *m, loff_t *pos)
791 return *pos <= NR_CPUS ? (void *)((*pos)+1) : NULL;
793 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
796 return c_start(m, pos);
798 static void c_stop(struct seq_file *m, void *v)
801 struct seq_operations cpuinfo_op = {
805 .show = show_cpuinfo,
808 #if 0 /* XXX not currently used */
809 unsigned long memory_limit;
811 static int __init early_parsemem(char *p)
816 memory_limit = memparse(p, &p);
820 early_param("mem", early_parsemem);
823 #ifdef CONFIG_PPC_MULTIPLATFORM
824 static int __init set_preferred_console(void)
826 struct device_node *prom_stdout = NULL;
831 DBG(" -> set_preferred_console()\n");
833 /* The user has requested a console so this is already set up. */
834 if (strstr(saved_command_line, "console=")) {
835 DBG(" console was specified !\n");
840 DBG(" of_chosen is NULL !\n");
843 /* We are getting a weird phandle from OF ... */
844 /* ... So use the full path instead */
845 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
847 DBG(" no linux,stdout-path !\n");
850 prom_stdout = of_find_node_by_path(name);
852 DBG(" can't find stdout package %s !\n", name);
855 DBG("stdout is %s\n", prom_stdout->full_name);
857 name = (char *)get_property(prom_stdout, "name", NULL);
859 DBG(" stdout package has no name !\n");
862 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
866 #ifdef CONFIG_SERIAL_8250_CONSOLE
867 else if (strcmp(name, "serial") == 0) {
869 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
885 /* We dont recognise the serial port */
890 #endif /* CONFIG_SERIAL_8250_CONSOLE */
891 #ifdef CONFIG_PPC_PSERIES
892 else if (strcmp(name, "vty") == 0) {
893 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
894 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
896 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
897 /* Host Virtual Serial Interface */
909 of_node_put(prom_stdout);
910 DBG("Found hvsi console at offset %d\n", offset);
911 return add_preferred_console("hvsi", offset, NULL);
913 /* pSeries LPAR virtual console */
914 of_node_put(prom_stdout);
915 DBG("Found hvc console\n");
916 return add_preferred_console("hvc", 0, NULL);
919 #endif /* CONFIG_PPC_PSERIES */
920 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
921 else if (strcmp(name, "ch-a") == 0)
923 else if (strcmp(name, "ch-b") == 0)
925 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
928 of_node_put(prom_stdout);
930 DBG("Found serial console at ttyS%d\n", offset);
933 static char __initdata opt[16];
934 sprintf(opt, "%d", *spd);
935 return add_preferred_console("ttyS", offset, opt);
937 return add_preferred_console("ttyS", offset, NULL);
940 DBG("No preferred console found !\n");
941 of_node_put(prom_stdout);
944 console_initcall(set_preferred_console);
945 #endif /* CONFIG_PPC_MULTIPLATFORM */
947 #ifdef CONFIG_IRQSTACKS
948 static void __init irqstack_early_init(void)
953 * interrupt stacks must be under 256MB, we cannot afford to take
954 * SLB misses on them.
957 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
958 THREAD_SIZE, 0x10000000));
959 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
960 THREAD_SIZE, 0x10000000));
964 #define irqstack_early_init()
968 * Stack space used when we detect a bad kernel stack pointer, and
969 * early in SMP boots before relocation is enabled.
971 static void __init emergency_stack_init(void)
977 * Emergency stacks must be under 256MB, we cannot afford to take
978 * SLB misses on them. The ABI also requires them to be 128-byte
981 * Since we use these as temporary stacks during secondary CPU
982 * bringup, we need to get at them in real mode. This means they
983 * must also be within the RMO region.
985 limit = min(0x10000000UL, lmb.rmo_size);
988 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
993 * Called into from start_kernel, after lock_kernel has been called.
994 * Initializes bootmem, which is unsed to manage page allocation until
995 * mem_init is called.
997 void __init setup_arch(char **cmdline_p)
999 extern void do_init_bootmem(void);
1001 ppc64_boot_msg(0x12, "Setup Arch");
1003 *cmdline_p = cmd_line;
1006 * Set cache line size based on type of cpu as a default.
1007 * Systems with OF can look in the properties on the cpu node(s)
1008 * for a possibly more accurate value.
1010 dcache_bsize = ppc64_caches.dline_size;
1011 icache_bsize = ppc64_caches.iline_size;
1013 /* reboot on panic */
1014 panic_timeout = 180;
1017 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
1019 init_mm.start_code = PAGE_OFFSET;
1020 init_mm.end_code = (unsigned long) _etext;
1021 init_mm.end_data = (unsigned long) _edata;
1022 init_mm.brk = klimit;
1024 irqstack_early_init();
1025 emergency_stack_init();
1027 /* set up the bootmem stuff with available memory */
1030 ppc_md.setup_arch();
1032 /* Select the correct idle loop for the platform. */
1036 ppc64_boot_msg(0x15, "Setup Done");
1040 /* ToDo: do something useful if ppc_md is not yet setup. */
1041 #define PPC64_LINUX_FUNCTION 0x0f000000
1042 #define PPC64_IPL_MESSAGE 0xc0000000
1043 #define PPC64_TERM_MESSAGE 0xb0000000
1044 #define PPC64_ATTN_MESSAGE 0xa0000000
1045 #define PPC64_DUMP_MESSAGE 0xd0000000
1047 static void ppc64_do_msg(unsigned int src, const char *msg)
1049 if (ppc_md.progress) {
1052 sprintf(buf, "%08x \n", src);
1053 ppc_md.progress(buf, 0);
1054 sprintf(buf, "%-16s", msg);
1055 ppc_md.progress(buf, 0);
1059 /* Print a boot progress message. */
1060 void ppc64_boot_msg(unsigned int src, const char *msg)
1062 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
1063 printk("[boot]%04x %s\n", src, msg);
1066 /* Print a termination message (print only -- does not stop the kernel) */
1067 void ppc64_terminate_msg(unsigned int src, const char *msg)
1069 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
1070 printk("[terminate]%04x %s\n", src, msg);
1073 /* Print something that needs attention (device error, etc) */
1074 void ppc64_attention_msg(unsigned int src, const char *msg)
1076 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_ATTN_MESSAGE|src, msg);
1077 printk("[attention]%04x %s\n", src, msg);
1080 /* Print a dump progress message. */
1081 void ppc64_dump_msg(unsigned int src, const char *msg)
1083 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_DUMP_MESSAGE|src, msg);
1084 printk("[dump]%04x %s\n", src, msg);
1087 int set_spread_lpevents( char * str )
1089 /* The parameter is the number of processors to share in processing lp events */
1091 unsigned long val = simple_strtoul( str, NULL, 0 );
1092 if ( ( val > 0 ) && ( val <= NR_CPUS ) ) {
1093 for ( i=1; i<val; ++i )
1094 paca[i].lpqueue_ptr = paca[0].lpqueue_ptr;
1095 printk("lpevent processing spread over %ld processors\n", val);
1098 printk("invalid spreaqd_lpevents %ld\n", val);
1102 /* This should only be called on processor 0 during calibrate decr */
1103 void setup_default_decr(void)
1105 struct paca_struct *lpaca = get_paca();
1107 if ( decr_overclock_set && !decr_overclock_proc0_set )
1108 decr_overclock_proc0 = decr_overclock;
1110 lpaca->default_decr = tb_ticks_per_jiffy / decr_overclock_proc0;
1111 lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
1114 int set_decr_overclock_proc0( char * str )
1116 unsigned long val = simple_strtoul( str, NULL, 0 );
1117 if ( ( val >= 1 ) && ( val <= 48 ) ) {
1118 decr_overclock_proc0_set = 1;
1119 decr_overclock_proc0 = val;
1120 printk("proc 0 decrementer overclock factor of %ld\n", val);
1123 printk("invalid proc 0 decrementer overclock factor of %ld\n", val);
1127 int set_decr_overclock( char * str )
1129 unsigned long val = simple_strtoul( str, NULL, 0 );
1130 if ( ( val >= 1 ) && ( val <= 48 ) ) {
1131 decr_overclock_set = 1;
1132 decr_overclock = val;
1133 printk("decrementer overclock factor of %ld\n", val);
1136 printk("invalid decrementer overclock factor of %ld\n", val);
1141 __setup("spread_lpevents=", set_spread_lpevents );
1142 __setup("decr_overclock_proc0=", set_decr_overclock_proc0 );
1143 __setup("decr_overclock=", set_decr_overclock );
1145 #ifndef CONFIG_PPC_ISERIES
1147 * This function can be used by platforms to "find" legacy serial ports.
1148 * It works for "serial" nodes under an "isa" node, and will try to
1149 * respect the "ibm,aix-loc" property if any. It works with up to 8
1153 #define MAX_LEGACY_SERIAL_PORTS 8
1154 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
1155 static unsigned int old_serial_count;
1157 void __init generic_find_legacy_serial_ports(u64 *physport,
1158 unsigned int *default_speed)
1160 struct device_node *np;
1163 struct isa_reg_property {
1168 struct pci_reg_property {
1169 struct pci_address addr;
1174 DBG(" -> generic_find_legacy_serial_port()\n");
1180 np = of_find_node_by_path("/");
1184 /* First fill our array */
1185 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
1186 struct device_node *isa, *pci;
1187 struct isa_reg_property *reg;
1188 unsigned long phys_size, addr_size, io_base;
1190 u32 *interrupts, *clk, *spd;
1192 int index, rlen, rentsize;
1194 /* Ok, first check if it's under an "isa" parent */
1195 isa = of_get_parent(np);
1196 if (!isa || strcmp(isa->name, "isa")) {
1197 DBG("%s: no isa parent found\n", np->full_name);
1201 /* Now look for an "ibm,aix-loc" property that gives us ordering
1204 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
1206 /* Get the ISA port number */
1207 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
1210 /* We assume the interrupt number isn't translated ... */
1211 interrupts = (u32 *)get_property(np, "interrupts", NULL);
1212 /* get clock freq. if present */
1213 clk = (u32 *)get_property(np, "clock-frequency", NULL);
1214 /* get default speed if present */
1215 spd = (u32 *)get_property(np, "current-speed", NULL);
1216 /* Default to locate at end of array */
1217 index = old_serial_count; /* end of the array by default */
1219 /* If we have a location index, then use it */
1220 if (typep && *typep == 'S') {
1221 index = simple_strtol(typep+1, NULL, 0) - 1;
1222 /* if index is out of range, use end of array instead */
1223 if (index >= MAX_LEGACY_SERIAL_PORTS)
1224 index = old_serial_count;
1225 /* if our index is still out of range, that mean that
1226 * array is full, we could scan for a free slot but that
1227 * make little sense to bother, just skip the port
1229 if (index >= MAX_LEGACY_SERIAL_PORTS)
1231 if (index >= old_serial_count)
1232 old_serial_count = index + 1;
1233 /* Check if there is a port who already claimed our slot */
1234 if (serial_ports[index].iobase != 0) {
1235 /* if we still have some room, move it, else override */
1236 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
1237 DBG("Moved legacy port %d -> %d\n", index,
1239 serial_ports[old_serial_count++] =
1240 serial_ports[index];
1242 DBG("Replacing legacy port %d\n", index);
1246 if (index >= MAX_LEGACY_SERIAL_PORTS)
1248 if (index >= old_serial_count)
1249 old_serial_count = index + 1;
1251 /* Now fill the entry */
1252 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
1253 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
1254 serial_ports[index].iobase = reg->address;
1255 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
1256 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
1258 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
1260 serial_ports[index].iobase,
1261 serial_ports[index].irq,
1262 serial_ports[index].uartclk);
1264 /* Get phys address of IO reg for port 1 */
1268 pci = of_get_parent(isa);
1270 DBG("%s: no pci parent found\n", np->full_name);
1274 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
1275 if (rangesp == NULL) {
1281 /* we need the #size-cells of the PCI bridge node itself */
1283 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
1284 if (sizeprop != NULL)
1285 phys_size = *sizeprop;
1286 /* we need the parent #addr-cells */
1287 addr_size = prom_n_addr_cells(pci);
1288 rentsize = 3 + addr_size + phys_size;
1290 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
1291 if (((rangesp[0] >> 24) & 0x3) != 1)
1292 continue; /* not IO space */
1293 io_base = rangesp[3];
1295 io_base = (io_base << 32) | rangesp[4];
1298 *physport = io_base + reg->address;
1299 if (default_speed && spd)
1300 *default_speed = *spd;
1307 DBG(" <- generic_find_legacy_serial_port()\n");
1310 static struct platform_device serial_device = {
1311 .name = "serial8250",
1314 .platform_data = serial_ports,
1318 static int __init serial_dev_init(void)
1320 return platform_device_register(&serial_device);
1322 arch_initcall(serial_dev_init);
1324 #endif /* CONFIG_PPC_ISERIES */
1326 int check_legacy_ioport(unsigned long base_port)
1328 if (ppc_md.check_legacy_ioport == NULL)
1330 return ppc_md.check_legacy_ioport(base_port);
1332 EXPORT_SYMBOL(check_legacy_ioport);
1335 static int __init early_xmon(char *p)
1337 /* ensure xmon is enabled */
1343 early_param("xmon", early_xmon);
1351 local_irq_disable();