2 * Common boot and setup code for both 32-bit and 64-bit.
3 * Extracted from arch/powerpc/kernel/setup_64.c.
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/export.h>
16 #include <linux/string.h>
17 #include <linux/sched.h>
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/reboot.h>
21 #include <linux/delay.h>
22 #include <linux/initrd.h>
23 #include <linux/platform_device.h>
24 #include <linux/seq_file.h>
25 #include <linux/ioport.h>
26 #include <linux/console.h>
27 #include <linux/screen_info.h>
28 #include <linux/root_dev.h>
29 #include <linux/notifier.h>
30 #include <linux/cpu.h>
31 #include <linux/unistd.h>
32 #include <linux/serial.h>
33 #include <linux/serial_8250.h>
34 #include <linux/percpu.h>
35 #include <linux/memblock.h>
36 #include <linux/of_platform.h>
37 #include <linux/hugetlb.h>
38 #include <asm/debugfs.h>
42 #include <asm/processor.h>
43 #include <asm/vdso_datapage.h>
44 #include <asm/pgtable.h>
47 #include <asm/machdep.h>
49 #include <asm/cputable.h>
50 #include <asm/sections.h>
51 #include <asm/firmware.h>
52 #include <asm/btext.h>
53 #include <asm/nvram.h>
54 #include <asm/setup.h>
56 #include <asm/iommu.h>
57 #include <asm/serial.h>
58 #include <asm/cache.h>
62 #include <asm/cputhreads.h>
63 #include <mm/mmu_decl.h>
64 #include <asm/fadump.h>
66 #include <asm/hugetlb.h>
67 #include <asm/livepatch.h>
68 #include <asm/mmu_context.h>
69 #include <asm/cpu_has_feature.h>
75 #define DBG(fmt...) udbg_printf(fmt)
80 /* The main machine-dep calls structure
82 struct machdep_calls ppc_md;
83 EXPORT_SYMBOL(ppc_md);
84 struct machdep_calls *machine_id;
85 EXPORT_SYMBOL(machine_id);
88 EXPORT_SYMBOL_GPL(boot_cpuid);
91 * These are used in binfmt_elf.c to put aux entries on the stack
92 * for each elf executable being started.
99 unsigned long klimit = (unsigned long) _end;
102 * This still seems to be needed... -- paulus
104 struct screen_info screen_info = {
107 .orig_video_cols = 80,
108 .orig_video_lines = 25,
109 .orig_video_isVGA = 1,
110 .orig_video_points = 16
112 #if defined(CONFIG_FB_VGA16_MODULE)
113 EXPORT_SYMBOL(screen_info);
116 /* Variables required to store legacy IO irq routing */
117 int of_i8042_kbd_irq;
118 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
119 int of_i8042_aux_irq;
120 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
122 #ifdef __DO_IRQ_CANON
123 /* XXX should go elsewhere eventually */
124 int ppc_do_canonicalize_irqs;
125 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
128 #ifdef CONFIG_CRASH_CORE
129 /* This keeps a track of which one is the crashing cpu. */
130 int crashing_cpu = -1;
133 /* also used by kexec */
134 void machine_shutdown(void)
136 #ifdef CONFIG_FA_DUMP
138 * if fadump is active, cleanup the fadump registration before we
144 if (ppc_md.machine_shutdown)
145 ppc_md.machine_shutdown();
148 static void machine_hang(void)
150 pr_emerg("System Halted, OK to turn off power\n");
156 void machine_restart(char *cmd)
164 do_kernel_restart(cmd);
170 void machine_power_off(void)
179 /* Used by the G5 thermal driver */
180 EXPORT_SYMBOL_GPL(machine_power_off);
182 void (*pm_power_off)(void);
183 EXPORT_SYMBOL_GPL(pm_power_off);
185 void machine_halt(void)
197 extern u32 cpu_temp(unsigned long cpu);
198 extern u32 cpu_temp_both(unsigned long cpu);
199 #endif /* CONFIG_TAU */
202 DEFINE_PER_CPU(unsigned int, cpu_pvr);
205 static void show_cpuinfo_summary(struct seq_file *m)
207 struct device_node *root;
208 const char *model = NULL;
209 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
210 unsigned long bogosum = 0;
212 for_each_online_cpu(i)
213 bogosum += loops_per_jiffy;
214 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
215 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
216 #endif /* CONFIG_SMP && CONFIG_PPC32 */
217 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
219 seq_printf(m, "platform\t: %s\n", ppc_md.name);
220 root = of_find_node_by_path("/");
222 model = of_get_property(root, "model", NULL);
224 seq_printf(m, "model\t\t: %s\n", model);
227 if (ppc_md.show_cpuinfo != NULL)
228 ppc_md.show_cpuinfo(m);
231 /* Display the amount of memory */
232 seq_printf(m, "Memory\t\t: %d MB\n",
233 (unsigned int)(total_memory / (1024 * 1024)));
237 static int show_cpuinfo(struct seq_file *m, void *v)
239 unsigned long cpu_id = (unsigned long)v - 1;
241 unsigned long proc_freq;
246 pvr = per_cpu(cpu_pvr, cpu_id);
248 pvr = mfspr(SPRN_PVR);
250 maj = (pvr >> 8) & 0xFF;
253 seq_printf(m, "processor\t: %lu\n", cpu_id);
254 seq_printf(m, "cpu\t\t: ");
256 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
257 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
259 seq_printf(m, "unknown (%08x)", pvr);
261 #ifdef CONFIG_ALTIVEC
262 if (cpu_has_feature(CPU_FTR_ALTIVEC))
263 seq_printf(m, ", altivec supported");
264 #endif /* CONFIG_ALTIVEC */
269 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
270 #ifdef CONFIG_TAU_AVERAGE
271 /* more straightforward, but potentially misleading */
272 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
275 /* show the actual temp sensor range */
277 temp = cpu_temp_both(cpu_id);
278 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
279 temp & 0xff, temp >> 16);
282 #endif /* CONFIG_TAU */
285 * Platforms that have variable clock rates, should implement
286 * the method ppc_md.get_proc_freq() that reports the clock
287 * rate of a given cpu. The rest can use ppc_proc_freq to
288 * report the clock rate that is same across all cpus.
290 if (ppc_md.get_proc_freq)
291 proc_freq = ppc_md.get_proc_freq(cpu_id);
293 proc_freq = ppc_proc_freq;
296 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
297 proc_freq / 1000000, proc_freq % 1000000);
299 if (ppc_md.show_percpuinfo != NULL)
300 ppc_md.show_percpuinfo(m, cpu_id);
302 /* If we are a Freescale core do a simple check so
303 * we dont have to keep adding cases in the future */
304 if (PVR_VER(pvr) & 0x8000) {
305 switch (PVR_VER(pvr)) {
306 case 0x8000: /* 7441/7450/7451, Voyager */
307 case 0x8001: /* 7445/7455, Apollo 6 */
308 case 0x8002: /* 7447/7457, Apollo 7 */
309 case 0x8003: /* 7447A, Apollo 7 PM */
310 case 0x8004: /* 7448, Apollo 8 */
311 case 0x800c: /* 7410, Nitro */
312 maj = ((pvr >> 8) & 0xF);
315 default: /* e500/book-e */
321 switch (PVR_VER(pvr)) {
322 case 0x0020: /* 403 family */
323 maj = PVR_MAJ(pvr) + 1;
326 case 0x1008: /* 740P/750P ?? */
327 maj = ((pvr >> 8) & 0xFF) - 1;
330 case 0x004e: /* POWER9 bits 12-15 give chip type */
331 maj = (pvr >> 8) & 0x0F;
335 maj = (pvr >> 8) & 0xFF;
341 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
342 maj, min, PVR_VER(pvr), PVR_REV(pvr));
345 seq_printf(m, "bogomips\t: %lu.%02lu\n",
346 loops_per_jiffy / (500000/HZ),
347 (loops_per_jiffy / (5000/HZ)) % 100);
353 /* If this is the last cpu, print the summary */
354 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
355 show_cpuinfo_summary(m);
360 static void *c_start(struct seq_file *m, loff_t *pos)
362 if (*pos == 0) /* just in case, cpu 0 is not the first */
363 *pos = cpumask_first(cpu_online_mask);
365 *pos = cpumask_next(*pos - 1, cpu_online_mask);
366 if ((*pos) < nr_cpu_ids)
367 return (void *)(unsigned long)(*pos + 1);
371 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
374 return c_start(m, pos);
377 static void c_stop(struct seq_file *m, void *v)
381 const struct seq_operations cpuinfo_op = {
385 .show = show_cpuinfo,
388 void __init check_for_initrd(void)
390 #ifdef CONFIG_BLK_DEV_INITRD
391 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
392 initrd_start, initrd_end);
394 /* If we were passed an initrd, set the ROOT_DEV properly if the values
395 * look sensible. If not, clear initrd reference.
397 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
398 initrd_end > initrd_start)
399 ROOT_DEV = Root_RAM0;
401 initrd_start = initrd_end = 0;
404 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
406 DBG(" <- check_for_initrd()\n");
407 #endif /* CONFIG_BLK_DEV_INITRD */
412 int threads_per_core, threads_per_subcore, threads_shift;
413 cpumask_t threads_core_mask;
414 EXPORT_SYMBOL_GPL(threads_per_core);
415 EXPORT_SYMBOL_GPL(threads_per_subcore);
416 EXPORT_SYMBOL_GPL(threads_shift);
417 EXPORT_SYMBOL_GPL(threads_core_mask);
419 static void __init cpu_init_thread_core_maps(int tpc)
423 threads_per_core = tpc;
424 threads_per_subcore = tpc;
425 cpumask_clear(&threads_core_mask);
427 /* This implementation only supports power of 2 number of threads
428 * for simplicity and performance
430 threads_shift = ilog2(tpc);
431 BUG_ON(tpc != (1 << threads_shift));
433 for (i = 0; i < tpc; i++)
434 cpumask_set_cpu(i, &threads_core_mask);
436 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
437 tpc, tpc > 1 ? "s" : "");
438 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
443 * setup_cpu_maps - initialize the following cpu maps:
447 * Having the possible map set up early allows us to restrict allocations
448 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
450 * We do not initialize the online map here; cpus set their own bits in
451 * cpu_online_mask as they come up.
453 * This function is valid only for Open Firmware systems. finish_device_tree
454 * must be called before using this.
456 * While we're here, we may as well set the "physical" cpu ids in the paca.
458 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
460 void __init smp_setup_cpu_maps(void)
462 struct device_node *dn = NULL;
466 DBG("smp_setup_cpu_maps()\n");
468 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
469 const __be32 *intserv;
473 DBG(" * %pOF...\n", dn);
475 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
478 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
481 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
482 intserv = of_get_property(dn, "reg", &len);
484 cpu_be = cpu_to_be32(cpu);
485 intserv = &cpu_be; /* assume logical == phys */
490 nthreads = len / sizeof(int);
492 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
495 DBG(" thread %d -> cpu %d (hard id %d)\n",
496 j, cpu, be32_to_cpu(intserv[j]));
498 avail = of_device_is_available(dn);
500 avail = !of_property_match_string(dn,
501 "enable-method", "spin-table");
503 set_cpu_present(cpu, avail);
504 set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
505 set_cpu_possible(cpu, true);
510 /* If no SMT supported, nthreads is forced to 1 */
511 if (!cpu_has_feature(CPU_FTR_SMT)) {
512 DBG(" SMT disabled ! nthreads forced to 1\n");
518 * On pSeries LPAR, we need to know how many cpus
519 * could possibly be added to this partition.
521 if (firmware_has_feature(FW_FEATURE_LPAR) &&
522 (dn = of_find_node_by_path("/rtas"))) {
523 int num_addr_cell, num_size_cell, maxcpus;
526 num_addr_cell = of_n_addr_cells(dn);
527 num_size_cell = of_n_size_cells(dn);
529 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
534 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
536 /* Double maxcpus for processors which have SMT capability */
537 if (cpu_has_feature(CPU_FTR_SMT))
540 if (maxcpus > nr_cpu_ids) {
542 "Partition configured for %d cpus, "
543 "operating system maximum is %u.\n",
544 maxcpus, nr_cpu_ids);
545 maxcpus = nr_cpu_ids;
547 printk(KERN_INFO "Partition configured for %d cpus.\n",
550 for (cpu = 0; cpu < maxcpus; cpu++)
551 set_cpu_possible(cpu, true);
555 vdso_data->processorCount = num_present_cpus();
556 #endif /* CONFIG_PPC64 */
558 /* Initialize CPU <=> thread mapping/
560 * WARNING: We assume that the number of threads is the same for
561 * every CPU in the system. If that is not the case, then some code
562 * here will have to be reworked
564 cpu_init_thread_core_maps(nthreads);
566 /* Now that possible cpus are set, set nr_cpu_ids for later use */
571 #endif /* CONFIG_SMP */
573 #ifdef CONFIG_PCSPKR_PLATFORM
574 static __init int add_pcspkr(void)
576 struct device_node *np;
577 struct platform_device *pd;
580 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
585 pd = platform_device_alloc("pcspkr", -1);
589 ret = platform_device_add(pd);
591 platform_device_put(pd);
595 device_initcall(add_pcspkr);
596 #endif /* CONFIG_PCSPKR_PLATFORM */
598 void probe_machine(void)
600 extern struct machdep_calls __machine_desc_start;
601 extern struct machdep_calls __machine_desc_end;
605 * Iterate all ppc_md structures until we find the proper
606 * one for the current machine type
608 DBG("Probing machine type ...\n");
611 * Check ppc_md is empty, if not we have a bug, ie, we setup an
612 * entry before probe_machine() which will be overwritten
614 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
615 if (((void **)&ppc_md)[i]) {
616 printk(KERN_ERR "Entry %d in ppc_md non empty before"
617 " machine probe !\n", i);
621 for (machine_id = &__machine_desc_start;
622 machine_id < &__machine_desc_end;
624 DBG(" %s ...", machine_id->name);
625 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
626 if (ppc_md.probe()) {
632 /* What can we do if we didn't find ? */
633 if (machine_id >= &__machine_desc_end) {
634 DBG("No suitable machine found !\n");
638 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
641 /* Match a class of boards, not a specific device configuration. */
642 int check_legacy_ioport(unsigned long base_port)
644 struct device_node *parent, *np = NULL;
649 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
650 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
652 parent = of_get_parent(np);
654 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
655 if (!of_i8042_kbd_irq)
656 of_i8042_kbd_irq = 1;
658 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
659 if (!of_i8042_aux_irq)
660 of_i8042_aux_irq = 12;
666 np = of_find_node_by_type(NULL, "8042");
667 /* Pegasos has no device_type on its 8042 node, look for the
670 np = of_find_node_by_name(NULL, "8042");
672 of_i8042_kbd_irq = 1;
673 of_i8042_aux_irq = 12;
676 case FDC_BASE: /* FDC1 */
677 np = of_find_node_by_type(NULL, "fdc");
680 /* ipmi is supposed to fail here */
685 parent = of_get_parent(np);
687 if (strcmp(parent->type, "isa") == 0)
694 EXPORT_SYMBOL(check_legacy_ioport);
696 static int ppc_panic_event(struct notifier_block *this,
697 unsigned long event, void *ptr)
700 * If firmware-assisted dump has been registered then trigger
701 * firmware-assisted dump and let firmware handle everything else.
703 crash_fadump(NULL, ptr);
704 ppc_md.panic(ptr); /* May not return */
708 static struct notifier_block ppc_panic_block = {
709 .notifier_call = ppc_panic_event,
710 .priority = INT_MIN /* may not return; must be done last */
713 void __init setup_panic(void)
717 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
720 #ifdef CONFIG_CHECK_CACHE_COHERENCY
722 * For platforms that have configurable cache-coherency. This function
723 * checks that the cache coherency setting of the kernel matches the setting
724 * left by the firmware, as indicated in the device tree. Since a mismatch
725 * will eventually result in DMA failures, we print * and error and call
726 * BUG() in that case.
729 #ifdef CONFIG_NOT_COHERENT_CACHE
730 #define KERNEL_COHERENCY 0
732 #define KERNEL_COHERENCY 1
735 static int __init check_cache_coherency(void)
737 struct device_node *np;
739 int devtree_coherency;
741 np = of_find_node_by_path("/");
742 prop = of_get_property(np, "coherency-off", NULL);
745 devtree_coherency = prop ? 0 : 1;
747 if (devtree_coherency != KERNEL_COHERENCY) {
749 "kernel coherency:%s != device tree_coherency:%s\n",
750 KERNEL_COHERENCY ? "on" : "off",
751 devtree_coherency ? "on" : "off");
758 late_initcall(check_cache_coherency);
759 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
761 #ifdef CONFIG_DEBUG_FS
762 struct dentry *powerpc_debugfs_root;
763 EXPORT_SYMBOL(powerpc_debugfs_root);
765 static int powerpc_debugfs_init(void)
767 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
769 return powerpc_debugfs_root == NULL;
771 arch_initcall(powerpc_debugfs_init);
774 void ppc_printk_progress(char *s, unsigned short hex)
779 void arch_setup_pdev_archdata(struct platform_device *pdev)
781 pdev->archdata.dma_mask = DMA_BIT_MASK(32);
782 pdev->dev.dma_mask = &pdev->archdata.dma_mask;
783 set_dma_ops(&pdev->dev, &dma_direct_ops);
786 static __init void print_system_info(void)
788 pr_info("-----------------------------------------------------\n");
789 #ifdef CONFIG_PPC_STD_MMU_64
790 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size);
792 #ifdef CONFIG_PPC_STD_MMU_32
793 pr_info("Hash_size = 0x%lx\n", Hash_size);
795 pr_info("phys_mem_size = 0x%llx\n",
796 (unsigned long long)memblock_phys_mem_size());
798 pr_info("dcache_bsize = 0x%x\n", dcache_bsize);
799 pr_info("icache_bsize = 0x%x\n", icache_bsize);
800 if (ucache_bsize != 0)
801 pr_info("ucache_bsize = 0x%x\n", ucache_bsize);
803 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features);
804 pr_info(" possible = 0x%016lx\n",
805 (unsigned long)CPU_FTRS_POSSIBLE);
806 pr_info(" always = 0x%016lx\n",
807 (unsigned long)CPU_FTRS_ALWAYS);
808 pr_info("cpu_user_features = 0x%08x 0x%08x\n",
809 cur_cpu_spec->cpu_user_features,
810 cur_cpu_spec->cpu_user_features2);
811 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features);
813 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
816 #ifdef CONFIG_PPC_STD_MMU_64
818 pr_info("htab_address = 0x%p\n", htab_address);
820 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask);
822 #ifdef CONFIG_PPC_STD_MMU_32
824 pr_info("Hash = 0x%p\n", Hash);
826 pr_info("Hash_mask = 0x%lx\n", Hash_mask);
829 if (PHYSICAL_START > 0)
830 pr_info("physical_start = 0x%llx\n",
831 (unsigned long long)PHYSICAL_START);
832 pr_info("-----------------------------------------------------\n");
836 * Called into from start_kernel this initializes memblock, which is used
837 * to manage page allocation until mem_init is called.
839 void __init setup_arch(char **cmdline_p)
841 *cmdline_p = boot_command_line;
843 /* Set a half-reasonable default so udelay does something sensible */
844 loops_per_jiffy = 500000000 / HZ;
846 /* Unflatten the device-tree passed by prom_init or kexec */
847 unflatten_device_tree();
850 * Initialize cache line/block info from device-tree (on ppc64) or
851 * just cputable (on ppc32).
853 initialize_cache_info();
855 /* Initialize RTAS if available. */
858 /* Check if we have an initrd provided via the device-tree. */
861 /* Probe the machine type, establish ppc_md. */
864 /* Setup panic notifier if requested by the platform. */
868 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
869 * it from their respective probe() function.
873 /* Discover standard serial ports. */
874 find_legacy_serial_ports();
876 /* Register early console with the printk subsystem. */
877 register_early_udbg_console();
879 /* Setup the various CPU maps based on the device-tree. */
880 smp_setup_cpu_maps();
882 /* Initialize xmon. */
885 /* Check the SMT related command line arguments (ppc64). */
888 /* On BookE, setup per-core TLB data structures. */
889 setup_tlb_core_data();
892 * Release secondary cpus out of their spinloops at 0x60 now that
893 * we can map physical -> logical CPU ids.
895 * Freescale Book3e parts spin in a loop provided by firmware,
896 * so smp_release_cpus() does nothing for them.
902 /* Print various info about the machine that has been gathered so far. */
905 /* Reserve large chunks of memory for use by CMA for KVM. */
908 klp_init_thread_info(&init_thread_info);
910 init_mm.start_code = (unsigned long)_stext;
911 init_mm.end_code = (unsigned long) _etext;
912 init_mm.end_data = (unsigned long) _edata;
913 init_mm.brk = klimit;
915 #ifdef CONFIG_PPC_MM_SLICES
917 init_mm.context.addr_limit = DEFAULT_MAP_WINDOW_USER64;
918 #elif defined(CONFIG_PPC_8xx)
919 init_mm.context.addr_limit = DEFAULT_MAP_WINDOW;
921 #error "context.addr_limit not initialized."
925 #ifdef CONFIG_SPAPR_TCE_IOMMU
926 mm_iommu_init(&init_mm);
928 irqstack_early_init();
929 exc_lvl_early_init();
930 emergency_stack_init();
934 #ifdef CONFIG_DUMMY_CONSOLE
935 conswitchp = &dummy_con;
937 if (ppc_md.setup_arch)
940 setup_barrier_nospec();
945 /* Initialize the MMU context management stuff. */
949 /* Interrupt code needs to be 64K-aligned. */
950 if ((unsigned long)_stext & 0xffff)
951 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
952 (unsigned long)_stext);