3 * Common boot and setup code.
5 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/string.h>
18 #include <linux/sched.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/reboot.h>
22 #include <linux/delay.h>
23 #include <linux/initrd.h>
24 #include <linux/ide.h>
25 #include <linux/seq_file.h>
26 #include <linux/ioport.h>
27 #include <linux/console.h>
28 #include <linux/utsname.h>
29 #include <linux/tty.h>
30 #include <linux/root_dev.h>
31 #include <linux/notifier.h>
32 #include <linux/cpu.h>
33 #include <linux/unistd.h>
34 #include <linux/serial.h>
35 #include <linux/serial_8250.h>
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 { 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 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);
108 int boot_cpuid_phys = 0;
112 struct ppc64_caches ppc64_caches;
113 EXPORT_SYMBOL_GPL(ppc64_caches);
116 * These are used in binfmt_elf.c to put aux entries on the stack
117 * for each elf executable being started.
123 /* The main machine-dep calls structure
125 struct machdep_calls ppc_md;
126 EXPORT_SYMBOL(ppc_md);
128 #ifdef CONFIG_MAGIC_SYSRQ
129 unsigned long SYSRQ_KEY;
130 #endif /* CONFIG_MAGIC_SYSRQ */
133 static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
134 static struct notifier_block ppc64_panic_block = {
135 .notifier_call = ppc64_panic_event,
136 .priority = INT_MIN /* may not return; must be done last */
140 * Perhaps we can put the pmac screen_info[] here
141 * on pmac as well so we don't need the ifdef's.
142 * Until we get multiple-console support in here
144 * Maybe tie it to serial consoles, since this is really what
145 * these processors use on existing boards. -- Dan
147 struct screen_info screen_info = {
150 .orig_video_cols = 80,
151 .orig_video_lines = 25,
152 .orig_video_isVGA = 1,
153 .orig_video_points = 16
156 #if defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP)
158 static int smt_enabled_cmdline;
160 /* Look for ibm,smt-enabled OF option */
161 static void check_smt_enabled(void)
163 struct device_node *dn;
166 /* Allow the command line to overrule the OF option */
167 if (smt_enabled_cmdline)
170 dn = of_find_node_by_path("/options");
173 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
176 if (!strcmp(smt_option, "on"))
177 smt_enabled_at_boot = 1;
178 else if (!strcmp(smt_option, "off"))
179 smt_enabled_at_boot = 0;
184 /* Look for smt-enabled= cmdline option */
185 static int __init early_smt_enabled(char *p)
187 smt_enabled_cmdline = 1;
192 if (!strcmp(p, "on") || !strcmp(p, "1"))
193 smt_enabled_at_boot = 1;
194 else if (!strcmp(p, "off") || !strcmp(p, "0"))
195 smt_enabled_at_boot = 0;
199 early_param("smt-enabled", early_smt_enabled);
202 * setup_cpu_maps - initialize the following cpu maps:
207 * Having the possible map set up early allows us to restrict allocations
208 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
210 * We do not initialize the online map here; cpus set their own bits in
211 * cpu_online_map as they come up.
213 * This function is valid only for Open Firmware systems. finish_device_tree
214 * must be called before using this.
216 * While we're here, we may as well set the "physical" cpu ids in the paca.
218 static void __init setup_cpu_maps(void)
220 struct device_node *dn = NULL;
226 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
228 int j, len = sizeof(u32), nthreads;
230 intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
233 intserv = (u32 *)get_property(dn, "reg", NULL);
235 nthreads = len / sizeof(u32);
237 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
238 cpu_set(cpu, cpu_present_map);
239 set_hard_smp_processor_id(cpu, intserv[j]);
241 if (intserv[j] == boot_cpuid_phys)
243 cpu_set(cpu, cpu_possible_map);
248 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
249 * boot cpu is logical 0.
251 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
253 tmp = get_hard_smp_processor_id(0);
254 set_hard_smp_processor_id(0, boot_cpuid_phys);
255 set_hard_smp_processor_id(swap_cpuid, tmp);
259 * On pSeries LPAR, we need to know how many cpus
260 * could possibly be added to this partition.
262 if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
263 (dn = of_find_node_by_path("/rtas"))) {
264 int num_addr_cell, num_size_cell, maxcpus;
267 num_addr_cell = prom_n_addr_cells(dn);
268 num_size_cell = prom_n_size_cells(dn);
270 ireg = (unsigned int *)
271 get_property(dn, "ibm,lrdr-capacity", NULL);
276 maxcpus = ireg[num_addr_cell + num_size_cell];
278 /* Double maxcpus for processors which have SMT capability */
279 if (cpu_has_feature(CPU_FTR_SMT))
282 if (maxcpus > NR_CPUS) {
284 "Partition configured for %d cpus, "
285 "operating system maximum is %d.\n",
289 printk(KERN_INFO "Partition configured for %d cpus.\n",
292 for (cpu = 0; cpu < maxcpus; cpu++)
293 cpu_set(cpu, cpu_possible_map);
299 * Do the sibling map; assume only two threads per processor.
302 cpu_set(cpu, cpu_sibling_map[cpu]);
303 if (cpu_has_feature(CPU_FTR_SMT))
304 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
307 systemcfg->processorCount = num_present_cpus();
309 #endif /* defined(CONFIG_PPC_MULTIPLATFORM) && defined(CONFIG_SMP) */
312 #ifdef CONFIG_PPC_MULTIPLATFORM
314 extern struct machdep_calls pSeries_md;
315 extern struct machdep_calls pmac_md;
316 extern struct machdep_calls maple_md;
317 extern struct machdep_calls bpa_md;
319 /* Ultimately, stuff them in an elf section like initcalls... */
320 static struct machdep_calls __initdata *machines[] = {
321 #ifdef CONFIG_PPC_PSERIES
323 #endif /* CONFIG_PPC_PSERIES */
324 #ifdef CONFIG_PPC_PMAC
326 #endif /* CONFIG_PPC_PMAC */
327 #ifdef CONFIG_PPC_MAPLE
329 #endif /* CONFIG_PPC_MAPLE */
330 #ifdef CONFIG_PPC_BPA
337 * Early initialization entry point. This is called by head.S
338 * with MMU translation disabled. We rely on the "feature" of
339 * the CPU that ignores the top 2 bits of the address in real
340 * mode so we can access kernel globals normally provided we
341 * only toy with things in the RMO region. From here, we do
342 * some early parsing of the device-tree to setup out LMB
343 * data structures, and allocate & initialize the hash table
344 * and segment tables so we can start running with translation
347 * It is this function which will call the probe() callback of
348 * the various platform types and copy the matching one to the
349 * global ppc_md structure. Your platform can eventually do
350 * some very early initializations from the probe() routine, but
351 * this is not recommended, be very careful as, for example, the
352 * device-tree is not accessible via normal means at this point.
355 void __init early_setup(unsigned long dt_ptr)
357 struct paca_struct *lpaca = get_paca();
358 static struct machdep_calls **mach;
361 * Enable early debugging if any specified (see top of
366 DBG(" -> early_setup()\n");
369 * Fill the default DBG level (do we want to keep
370 * that old mecanism around forever ?)
375 * Do early initializations using the flattened device
376 * tree, like retreiving the physical memory map or
377 * calculating/retreiving the hash table size
379 early_init_devtree(__va(dt_ptr));
382 * Iterate all ppc_md structures until we find the proper
383 * one for the current machine type
385 DBG("Probing machine type for platform %x...\n",
386 systemcfg->platform);
388 for (mach = machines; *mach; mach++) {
389 if ((*mach)->probe(systemcfg->platform))
392 /* What can we do if we didn't find ? */
394 DBG("No suitable machine found !\n");
399 DBG("Found, Initializing memory management...\n");
402 * Initialize stab / SLB management
404 stab_initialize(lpaca->stab_real);
407 * Initialize the MMU Hash table and create the linear mapping
412 DBG(" <- early_setup()\n");
417 * Initialize some remaining members of the ppc64_caches and systemcfg structures
418 * (at least until we get rid of them completely). This is mostly some
419 * cache informations about the CPU that will be used by cache flush
420 * routines and/or provided to userland
422 static void __init initialize_cache_info(void)
424 struct device_node *np;
425 unsigned long num_cpus = 0;
427 DBG(" -> initialize_cache_info()\n");
429 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
432 /* We're assuming *all* of the CPUs have the same
433 * d-cache and i-cache sizes... -Peter
436 if ( num_cpus == 1 ) {
441 /* Then read cache informations */
442 if (systemcfg->platform == PLATFORM_POWERMAC) {
443 dc = "d-cache-block-size";
444 ic = "i-cache-block-size";
446 dc = "d-cache-line-size";
447 ic = "i-cache-line-size";
451 lsize = cur_cpu_spec->dcache_bsize;
452 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
455 lsizep = (u32 *) get_property(np, dc, NULL);
458 if (sizep == 0 || lsizep == 0)
459 DBG("Argh, can't find dcache properties ! "
460 "sizep: %p, lsizep: %p\n", sizep, lsizep);
462 systemcfg->dcache_size = ppc64_caches.dsize = size;
463 systemcfg->dcache_line_size =
464 ppc64_caches.dline_size = lsize;
465 ppc64_caches.log_dline_size = __ilog2(lsize);
466 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
469 lsize = cur_cpu_spec->icache_bsize;
470 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
473 lsizep = (u32 *)get_property(np, ic, NULL);
476 if (sizep == 0 || lsizep == 0)
477 DBG("Argh, can't find icache properties ! "
478 "sizep: %p, lsizep: %p\n", sizep, lsizep);
480 systemcfg->icache_size = ppc64_caches.isize = size;
481 systemcfg->icache_line_size =
482 ppc64_caches.iline_size = lsize;
483 ppc64_caches.log_iline_size = __ilog2(lsize);
484 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
488 /* Add an eye catcher and the systemcfg layout version number */
489 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
490 systemcfg->version.major = SYSTEMCFG_MAJOR;
491 systemcfg->version.minor = SYSTEMCFG_MINOR;
492 systemcfg->processor = mfspr(SPRN_PVR);
494 DBG(" <- initialize_cache_info()\n");
497 static void __init check_for_initrd(void)
499 #ifdef CONFIG_BLK_DEV_INITRD
502 DBG(" -> check_for_initrd()\n");
505 prop = (u64 *)get_property(of_chosen,
506 "linux,initrd-start", NULL);
508 initrd_start = (unsigned long)__va(*prop);
509 prop = (u64 *)get_property(of_chosen,
510 "linux,initrd-end", NULL);
512 initrd_end = (unsigned long)__va(*prop);
513 initrd_below_start_ok = 1;
519 /* If we were passed an initrd, set the ROOT_DEV properly if the values
520 * look sensible. If not, clear initrd reference.
522 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
523 initrd_end > initrd_start)
524 ROOT_DEV = Root_RAM0;
526 initrd_start = initrd_end = 0;
529 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
531 DBG(" <- check_for_initrd()\n");
532 #endif /* CONFIG_BLK_DEV_INITRD */
535 #endif /* CONFIG_PPC_MULTIPLATFORM */
538 * Do some initial setup of the system. The parameters are those which
539 * were passed in from the bootloader.
541 void __init setup_system(void)
543 DBG(" -> setup_system()\n");
545 #ifdef CONFIG_PPC_ISERIES
546 /* pSeries systems are identified in prom.c via OF. */
547 if (itLpNaca.xLparInstalled == 1)
548 systemcfg->platform = PLATFORM_ISERIES_LPAR;
551 #else /* CONFIG_PPC_ISERIES */
554 * Unflatten the device-tree passed by prom_init or kexec
556 unflatten_device_tree();
559 * Fill the ppc64_caches & systemcfg structures with informations
560 * retreived from the device-tree. Need to be called before
561 * finish_device_tree() since the later requires some of the
562 * informations filled up here to properly parse the interrupt
564 * It also sets up the cache line sizes which allows to call
565 * routines like flush_icache_range (used by the hash init
568 initialize_cache_info();
570 #ifdef CONFIG_PPC_RTAS
572 * Initialize RTAS if available
575 #endif /* CONFIG_PPC_RTAS */
578 * Check if we have an initrd provided via the device-tree
583 * Do some platform specific early initializations, that includes
584 * setting up the hash table pointers. It also sets up some interrupt-mapping
585 * related options that will be used by finish_device_tree()
590 * "Finish" the device-tree, that is do the actual parsing of
591 * some of the properties like the interrupt map
593 finish_device_tree();
598 #ifdef CONFIG_XMON_DEFAULT
602 * Register early console
604 register_early_udbg_console();
606 /* Save unparsed command line copy for /proc/cmdline */
607 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
610 #endif /* !CONFIG_PPC_ISERIES */
612 #if defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES)
614 * iSeries has already initialized the cpu maps at this point.
618 /* Release secondary cpus out of their spinloops at 0x60 now that
619 * we can map physical -> logical CPU ids
622 #endif /* defined(CONFIG_SMP) && !defined(CONFIG_PPC_ISERIES) */
624 printk("Starting Linux PPC64 %s\n", system_utsname.version);
626 printk("-----------------------------------------------------\n");
627 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
628 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
629 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
630 printk("systemcfg = 0x%p\n", systemcfg);
631 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
632 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
633 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
634 printk("ppc64_caches.dcache_line_size = 0x%x\n",
635 ppc64_caches.dline_size);
636 printk("ppc64_caches.icache_line_size = 0x%x\n",
637 ppc64_caches.iline_size);
638 printk("htab_address = 0x%p\n", htab_address);
639 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
640 printk("-----------------------------------------------------\n");
644 DBG(" <- setup_system()\n");
647 /* also used by kexec */
648 void machine_shutdown(void)
650 if (ppc_md.nvram_sync)
654 void machine_restart(char *cmd)
661 printk(KERN_EMERG "System Halted, OK to turn off power\n");
666 void machine_power_off(void)
673 printk(KERN_EMERG "System Halted, OK to turn off power\n");
677 /* Used by the G5 thermal driver */
678 EXPORT_SYMBOL_GPL(machine_power_off);
680 void machine_halt(void)
687 printk(KERN_EMERG "System Halted, OK to turn off power\n");
692 static int ppc64_panic_event(struct notifier_block *this,
693 unsigned long event, void *ptr)
695 ppc_md.panic((char *)ptr); /* May not return */
701 DEFINE_PER_CPU(unsigned int, pvr);
704 static int show_cpuinfo(struct seq_file *m, void *v)
706 unsigned long cpu_id = (unsigned long)v - 1;
711 if (cpu_id == NR_CPUS) {
712 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
714 if (ppc_md.get_cpuinfo != NULL)
715 ppc_md.get_cpuinfo(m);
720 /* We only show online cpus: disable preempt (overzealous, I
721 * knew) to prevent cpu going down. */
723 if (!cpu_online(cpu_id)) {
729 pvr = per_cpu(pvr, cpu_id);
731 pvr = mfspr(SPRN_PVR);
733 maj = (pvr >> 8) & 0xFF;
736 seq_printf(m, "processor\t: %lu\n", cpu_id);
737 seq_printf(m, "cpu\t\t: ");
739 if (cur_cpu_spec->pvr_mask)
740 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
742 seq_printf(m, "unknown (%08x)", pvr);
744 #ifdef CONFIG_ALTIVEC
745 if (cpu_has_feature(CPU_FTR_ALTIVEC))
746 seq_printf(m, ", altivec supported");
747 #endif /* CONFIG_ALTIVEC */
752 * Assume here that all clock rates are the same in a
753 * smp system. -- Cort
755 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
756 ppc_proc_freq % 1000000);
758 seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);
764 static void *c_start(struct seq_file *m, loff_t *pos)
766 return *pos <= NR_CPUS ? (void *)((*pos)+1) : NULL;
768 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
771 return c_start(m, pos);
773 static void c_stop(struct seq_file *m, void *v)
776 struct seq_operations cpuinfo_op = {
780 .show = show_cpuinfo,
784 * These three variables are used to save values passed to us by prom_init()
785 * via the device tree. The TCE variables are needed because with a memory_limit
786 * in force we may need to explicitly map the TCE are at the top of RAM.
788 unsigned long memory_limit;
789 unsigned long tce_alloc_start;
790 unsigned long tce_alloc_end;
792 #ifdef CONFIG_PPC_ISERIES
794 * On iSeries we just parse the mem=X option from the command line.
795 * On pSeries it's a bit more complicated, see prom_init_mem()
797 static int __init early_parsemem(char *p)
802 memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
806 early_param("mem", early_parsemem);
807 #endif /* CONFIG_PPC_ISERIES */
809 #ifdef CONFIG_PPC_MULTIPLATFORM
810 static int __init set_preferred_console(void)
812 struct device_node *prom_stdout = NULL;
817 DBG(" -> set_preferred_console()\n");
819 /* The user has requested a console so this is already set up. */
820 if (strstr(saved_command_line, "console=")) {
821 DBG(" console was specified !\n");
826 DBG(" of_chosen is NULL !\n");
829 /* We are getting a weird phandle from OF ... */
830 /* ... So use the full path instead */
831 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
833 DBG(" no linux,stdout-path !\n");
836 prom_stdout = of_find_node_by_path(name);
838 DBG(" can't find stdout package %s !\n", name);
841 DBG("stdout is %s\n", prom_stdout->full_name);
843 name = (char *)get_property(prom_stdout, "name", NULL);
845 DBG(" stdout package has no name !\n");
848 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
852 #ifdef CONFIG_SERIAL_8250_CONSOLE
853 else if (strcmp(name, "serial") == 0) {
855 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
871 /* We dont recognise the serial port */
876 #endif /* CONFIG_SERIAL_8250_CONSOLE */
877 #ifdef CONFIG_PPC_PSERIES
878 else if (strcmp(name, "vty") == 0) {
879 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
880 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
882 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
883 /* Host Virtual Serial Interface */
895 of_node_put(prom_stdout);
896 DBG("Found hvsi console at offset %d\n", offset);
897 return add_preferred_console("hvsi", offset, NULL);
899 /* pSeries LPAR virtual console */
900 of_node_put(prom_stdout);
901 DBG("Found hvc console\n");
902 return add_preferred_console("hvc", 0, NULL);
905 #endif /* CONFIG_PPC_PSERIES */
906 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
907 else if (strcmp(name, "ch-a") == 0)
909 else if (strcmp(name, "ch-b") == 0)
911 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
914 of_node_put(prom_stdout);
916 DBG("Found serial console at ttyS%d\n", offset);
919 static char __initdata opt[16];
920 sprintf(opt, "%d", *spd);
921 return add_preferred_console("ttyS", offset, opt);
923 return add_preferred_console("ttyS", offset, NULL);
926 DBG("No preferred console found !\n");
927 of_node_put(prom_stdout);
930 console_initcall(set_preferred_console);
931 #endif /* CONFIG_PPC_MULTIPLATFORM */
933 #ifdef CONFIG_IRQSTACKS
934 static void __init irqstack_early_init(void)
939 * interrupt stacks must be under 256MB, we cannot afford to take
940 * SLB misses on them.
943 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
944 THREAD_SIZE, 0x10000000));
945 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
946 THREAD_SIZE, 0x10000000));
950 #define irqstack_early_init()
954 * Stack space used when we detect a bad kernel stack pointer, and
955 * early in SMP boots before relocation is enabled.
957 static void __init emergency_stack_init(void)
963 * Emergency stacks must be under 256MB, we cannot afford to take
964 * SLB misses on them. The ABI also requires them to be 128-byte
967 * Since we use these as temporary stacks during secondary CPU
968 * bringup, we need to get at them in real mode. This means they
969 * must also be within the RMO region.
971 limit = min(0x10000000UL, lmb.rmo_size);
974 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
979 * Called from setup_arch to initialize the bitmap of available
980 * syscalls in the systemcfg page
982 void __init setup_syscall_map(void)
984 unsigned int i, count64 = 0, count32 = 0;
985 extern unsigned long *sys_call_table;
986 extern unsigned long *sys_call_table32;
987 extern unsigned long sys_ni_syscall;
990 for (i = 0; i < __NR_syscalls; i++) {
991 if (sys_call_table[i] == sys_ni_syscall)
994 systemcfg->syscall_map_64[i >> 5] |= 0x80000000UL >> (i & 0x1f);
996 for (i = 0; i < __NR_syscalls; i++) {
997 if (sys_call_table32[i] == sys_ni_syscall)
1000 systemcfg->syscall_map_32[i >> 5] |= 0x80000000UL >> (i & 0x1f);
1002 printk(KERN_INFO "Syscall map setup, %d 32 bits and %d 64 bits syscalls\n",
1007 * Called into from start_kernel, after lock_kernel has been called.
1008 * Initializes bootmem, which is unsed to manage page allocation until
1009 * mem_init is called.
1011 void __init setup_arch(char **cmdline_p)
1013 extern void do_init_bootmem(void);
1015 ppc64_boot_msg(0x12, "Setup Arch");
1017 *cmdline_p = cmd_line;
1020 * Set cache line size based on type of cpu as a default.
1021 * Systems with OF can look in the properties on the cpu node(s)
1022 * for a possibly more accurate value.
1024 dcache_bsize = ppc64_caches.dline_size;
1025 icache_bsize = ppc64_caches.iline_size;
1027 /* reboot on panic */
1028 panic_timeout = 180;
1031 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
1033 init_mm.start_code = PAGE_OFFSET;
1034 init_mm.end_code = (unsigned long) _etext;
1035 init_mm.end_data = (unsigned long) _edata;
1036 init_mm.brk = klimit;
1038 irqstack_early_init();
1039 emergency_stack_init();
1043 /* set up the bootmem stuff with available memory */
1047 /* initialize the syscall map in systemcfg */
1048 setup_syscall_map();
1050 ppc_md.setup_arch();
1052 /* Use the default idle loop if the platform hasn't provided one. */
1053 if (NULL == ppc_md.idle_loop) {
1054 ppc_md.idle_loop = default_idle;
1055 printk(KERN_INFO "Using default idle loop\n");
1059 ppc64_boot_msg(0x15, "Setup Done");
1063 /* ToDo: do something useful if ppc_md is not yet setup. */
1064 #define PPC64_LINUX_FUNCTION 0x0f000000
1065 #define PPC64_IPL_MESSAGE 0xc0000000
1066 #define PPC64_TERM_MESSAGE 0xb0000000
1068 static void ppc64_do_msg(unsigned int src, const char *msg)
1070 if (ppc_md.progress) {
1073 sprintf(buf, "%08X\n", src);
1074 ppc_md.progress(buf, 0);
1075 snprintf(buf, 128, "%s", msg);
1076 ppc_md.progress(buf, 0);
1080 /* Print a boot progress message. */
1081 void ppc64_boot_msg(unsigned int src, const char *msg)
1083 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
1084 printk("[boot]%04x %s\n", src, msg);
1087 /* Print a termination message (print only -- does not stop the kernel) */
1088 void ppc64_terminate_msg(unsigned int src, const char *msg)
1090 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
1091 printk("[terminate]%04x %s\n", src, msg);
1094 /* This should only be called on processor 0 during calibrate decr */
1095 void __init setup_default_decr(void)
1097 struct paca_struct *lpaca = get_paca();
1099 lpaca->default_decr = tb_ticks_per_jiffy;
1100 lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
1103 #ifndef CONFIG_PPC_ISERIES
1105 * This function can be used by platforms to "find" legacy serial ports.
1106 * It works for "serial" nodes under an "isa" node, and will try to
1107 * respect the "ibm,aix-loc" property if any. It works with up to 8
1111 #define MAX_LEGACY_SERIAL_PORTS 8
1112 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
1113 static unsigned int old_serial_count;
1115 void __init generic_find_legacy_serial_ports(u64 *physport,
1116 unsigned int *default_speed)
1118 struct device_node *np;
1121 struct isa_reg_property {
1126 struct pci_reg_property {
1127 struct pci_address addr;
1132 DBG(" -> generic_find_legacy_serial_port()\n");
1138 np = of_find_node_by_path("/");
1142 /* First fill our array */
1143 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
1144 struct device_node *isa, *pci;
1145 struct isa_reg_property *reg;
1146 unsigned long phys_size, addr_size, io_base;
1148 u32 *interrupts, *clk, *spd;
1150 int index, rlen, rentsize;
1152 /* Ok, first check if it's under an "isa" parent */
1153 isa = of_get_parent(np);
1154 if (!isa || strcmp(isa->name, "isa")) {
1155 DBG("%s: no isa parent found\n", np->full_name);
1159 /* Now look for an "ibm,aix-loc" property that gives us ordering
1162 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
1164 /* Get the ISA port number */
1165 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
1168 /* We assume the interrupt number isn't translated ... */
1169 interrupts = (u32 *)get_property(np, "interrupts", NULL);
1170 /* get clock freq. if present */
1171 clk = (u32 *)get_property(np, "clock-frequency", NULL);
1172 /* get default speed if present */
1173 spd = (u32 *)get_property(np, "current-speed", NULL);
1174 /* Default to locate at end of array */
1175 index = old_serial_count; /* end of the array by default */
1177 /* If we have a location index, then use it */
1178 if (typep && *typep == 'S') {
1179 index = simple_strtol(typep+1, NULL, 0) - 1;
1180 /* if index is out of range, use end of array instead */
1181 if (index >= MAX_LEGACY_SERIAL_PORTS)
1182 index = old_serial_count;
1183 /* if our index is still out of range, that mean that
1184 * array is full, we could scan for a free slot but that
1185 * make little sense to bother, just skip the port
1187 if (index >= MAX_LEGACY_SERIAL_PORTS)
1189 if (index >= old_serial_count)
1190 old_serial_count = index + 1;
1191 /* Check if there is a port who already claimed our slot */
1192 if (serial_ports[index].iobase != 0) {
1193 /* if we still have some room, move it, else override */
1194 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
1195 DBG("Moved legacy port %d -> %d\n", index,
1197 serial_ports[old_serial_count++] =
1198 serial_ports[index];
1200 DBG("Replacing legacy port %d\n", index);
1204 if (index >= MAX_LEGACY_SERIAL_PORTS)
1206 if (index >= old_serial_count)
1207 old_serial_count = index + 1;
1209 /* Now fill the entry */
1210 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
1211 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
1212 serial_ports[index].iobase = reg->address;
1213 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
1214 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
1216 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
1218 serial_ports[index].iobase,
1219 serial_ports[index].irq,
1220 serial_ports[index].uartclk);
1222 /* Get phys address of IO reg for port 1 */
1226 pci = of_get_parent(isa);
1228 DBG("%s: no pci parent found\n", np->full_name);
1232 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
1233 if (rangesp == NULL) {
1239 /* we need the #size-cells of the PCI bridge node itself */
1241 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
1242 if (sizeprop != NULL)
1243 phys_size = *sizeprop;
1244 /* we need the parent #addr-cells */
1245 addr_size = prom_n_addr_cells(pci);
1246 rentsize = 3 + addr_size + phys_size;
1248 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
1249 if (((rangesp[0] >> 24) & 0x3) != 1)
1250 continue; /* not IO space */
1251 io_base = rangesp[3];
1253 io_base = (io_base << 32) | rangesp[4];
1256 *physport = io_base + reg->address;
1257 if (default_speed && spd)
1258 *default_speed = *spd;
1265 DBG(" <- generic_find_legacy_serial_port()\n");
1268 static struct platform_device serial_device = {
1269 .name = "serial8250",
1270 .id = PLAT8250_DEV_PLATFORM,
1272 .platform_data = serial_ports,
1276 static int __init serial_dev_init(void)
1278 return platform_device_register(&serial_device);
1280 arch_initcall(serial_dev_init);
1282 #endif /* CONFIG_PPC_ISERIES */
1284 int check_legacy_ioport(unsigned long base_port)
1286 if (ppc_md.check_legacy_ioport == NULL)
1288 return ppc_md.check_legacy_ioport(base_port);
1290 EXPORT_SYMBOL(check_legacy_ioport);
1293 static int __init early_xmon(char *p)
1295 /* ensure xmon is enabled */
1297 if (strncmp(p, "on", 2) == 0)
1299 if (strncmp(p, "off", 3) == 0)
1301 if (strncmp(p, "early", 5) != 0)
1309 early_param("xmon", early_xmon);