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
;
245 /* We only show online cpus: disable preempt (overzealous, I
246 * knew) to prevent cpu going down. */
248 if (!cpu_online(cpu_id
)) {
254 pvr
= per_cpu(cpu_pvr
, cpu_id
);
256 pvr
= mfspr(SPRN_PVR
);
258 maj
= (pvr
>> 8) & 0xFF;
261 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
262 seq_printf(m
, "cpu\t\t: ");
264 if (cur_cpu_spec
->pvr_mask
&& cur_cpu_spec
->cpu_name
)
265 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
267 seq_printf(m
, "unknown (%08x)", pvr
);
269 #ifdef CONFIG_ALTIVEC
270 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
271 seq_printf(m
, ", altivec supported");
272 #endif /* CONFIG_ALTIVEC */
277 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
278 #ifdef CONFIG_TAU_AVERAGE
279 /* more straightforward, but potentially misleading */
280 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
283 /* show the actual temp sensor range */
285 temp
= cpu_temp_both(cpu_id
);
286 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
287 temp
& 0xff, temp
>> 16);
290 #endif /* CONFIG_TAU */
293 * Platforms that have variable clock rates, should implement
294 * the method ppc_md.get_proc_freq() that reports the clock
295 * rate of a given cpu. The rest can use ppc_proc_freq to
296 * report the clock rate that is same across all cpus.
298 if (ppc_md
.get_proc_freq
)
299 proc_freq
= ppc_md
.get_proc_freq(cpu_id
);
301 proc_freq
= ppc_proc_freq
;
304 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
305 proc_freq
/ 1000000, proc_freq
% 1000000);
307 if (ppc_md
.show_percpuinfo
!= NULL
)
308 ppc_md
.show_percpuinfo(m
, cpu_id
);
310 /* If we are a Freescale core do a simple check so
311 * we dont have to keep adding cases in the future */
312 if (PVR_VER(pvr
) & 0x8000) {
313 switch (PVR_VER(pvr
)) {
314 case 0x8000: /* 7441/7450/7451, Voyager */
315 case 0x8001: /* 7445/7455, Apollo 6 */
316 case 0x8002: /* 7447/7457, Apollo 7 */
317 case 0x8003: /* 7447A, Apollo 7 PM */
318 case 0x8004: /* 7448, Apollo 8 */
319 case 0x800c: /* 7410, Nitro */
320 maj
= ((pvr
>> 8) & 0xF);
323 default: /* e500/book-e */
329 switch (PVR_VER(pvr
)) {
330 case 0x0020: /* 403 family */
331 maj
= PVR_MAJ(pvr
) + 1;
334 case 0x1008: /* 740P/750P ?? */
335 maj
= ((pvr
>> 8) & 0xFF) - 1;
339 maj
= (pvr
>> 8) & 0xFF;
345 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
346 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
349 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
350 loops_per_jiffy
/ (500000/HZ
),
351 (loops_per_jiffy
/ (5000/HZ
)) % 100);
360 /* If this is the last cpu, print the summary */
361 if (cpumask_next(cpu_id
, cpu_online_mask
) >= nr_cpu_ids
)
362 show_cpuinfo_summary(m
);
367 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
369 if (*pos
== 0) /* just in case, cpu 0 is not the first */
370 *pos
= cpumask_first(cpu_online_mask
);
372 *pos
= cpumask_next(*pos
- 1, cpu_online_mask
);
373 if ((*pos
) < nr_cpu_ids
)
374 return (void *)(unsigned long)(*pos
+ 1);
378 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
381 return c_start(m
, pos
);
384 static void c_stop(struct seq_file
*m
, void *v
)
388 const struct seq_operations cpuinfo_op
= {
392 .show
= show_cpuinfo
,
395 void __init
check_for_initrd(void)
397 #ifdef CONFIG_BLK_DEV_INITRD
398 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
399 initrd_start
, initrd_end
);
401 /* If we were passed an initrd, set the ROOT_DEV properly if the values
402 * look sensible. If not, clear initrd reference.
404 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
405 initrd_end
> initrd_start
)
406 ROOT_DEV
= Root_RAM0
;
408 initrd_start
= initrd_end
= 0;
411 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
413 DBG(" <- check_for_initrd()\n");
414 #endif /* CONFIG_BLK_DEV_INITRD */
419 int threads_per_core
, threads_per_subcore
, threads_shift
;
420 cpumask_t threads_core_mask
;
421 EXPORT_SYMBOL_GPL(threads_per_core
);
422 EXPORT_SYMBOL_GPL(threads_per_subcore
);
423 EXPORT_SYMBOL_GPL(threads_shift
);
424 EXPORT_SYMBOL_GPL(threads_core_mask
);
426 static void __init
cpu_init_thread_core_maps(int tpc
)
430 threads_per_core
= tpc
;
431 threads_per_subcore
= tpc
;
432 cpumask_clear(&threads_core_mask
);
434 /* This implementation only supports power of 2 number of threads
435 * for simplicity and performance
437 threads_shift
= ilog2(tpc
);
438 BUG_ON(tpc
!= (1 << threads_shift
));
440 for (i
= 0; i
< tpc
; i
++)
441 cpumask_set_cpu(i
, &threads_core_mask
);
443 printk(KERN_INFO
"CPU maps initialized for %d thread%s per core\n",
444 tpc
, tpc
> 1 ? "s" : "");
445 printk(KERN_DEBUG
" (thread shift is %d)\n", threads_shift
);
450 * setup_cpu_maps - initialize the following cpu maps:
454 * Having the possible map set up early allows us to restrict allocations
455 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
457 * We do not initialize the online map here; cpus set their own bits in
458 * cpu_online_mask as they come up.
460 * This function is valid only for Open Firmware systems. finish_device_tree
461 * must be called before using this.
463 * While we're here, we may as well set the "physical" cpu ids in the paca.
465 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
467 void __init
smp_setup_cpu_maps(void)
469 struct device_node
*dn
= NULL
;
473 DBG("smp_setup_cpu_maps()\n");
475 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< nr_cpu_ids
) {
476 const __be32
*intserv
;
480 DBG(" * %s...\n", dn
->full_name
);
482 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
485 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
488 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
489 intserv
= of_get_property(dn
, "reg", &len
);
491 cpu_be
= cpu_to_be32(cpu
);
492 intserv
= &cpu_be
; /* assume logical == phys */
497 nthreads
= len
/ sizeof(int);
499 for (j
= 0; j
< nthreads
&& cpu
< nr_cpu_ids
; j
++) {
502 DBG(" thread %d -> cpu %d (hard id %d)\n",
503 j
, cpu
, be32_to_cpu(intserv
[j
]));
505 avail
= of_device_is_available(dn
);
507 avail
= !of_property_match_string(dn
,
508 "enable-method", "spin-table");
510 set_cpu_present(cpu
, avail
);
511 set_hard_smp_processor_id(cpu
, be32_to_cpu(intserv
[j
]));
512 set_cpu_possible(cpu
, true);
517 /* If no SMT supported, nthreads is forced to 1 */
518 if (!cpu_has_feature(CPU_FTR_SMT
)) {
519 DBG(" SMT disabled ! nthreads forced to 1\n");
525 * On pSeries LPAR, we need to know how many cpus
526 * could possibly be added to this partition.
528 if (firmware_has_feature(FW_FEATURE_LPAR
) &&
529 (dn
= of_find_node_by_path("/rtas"))) {
530 int num_addr_cell
, num_size_cell
, maxcpus
;
533 num_addr_cell
= of_n_addr_cells(dn
);
534 num_size_cell
= of_n_size_cells(dn
);
536 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
541 maxcpus
= be32_to_cpup(ireg
+ num_addr_cell
+ num_size_cell
);
543 /* Double maxcpus for processors which have SMT capability */
544 if (cpu_has_feature(CPU_FTR_SMT
))
547 if (maxcpus
> nr_cpu_ids
) {
549 "Partition configured for %d cpus, "
550 "operating system maximum is %d.\n",
551 maxcpus
, nr_cpu_ids
);
552 maxcpus
= nr_cpu_ids
;
554 printk(KERN_INFO
"Partition configured for %d cpus.\n",
557 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
558 set_cpu_possible(cpu
, true);
562 vdso_data
->processorCount
= num_present_cpus();
563 #endif /* CONFIG_PPC64 */
565 /* Initialize CPU <=> thread mapping/
567 * WARNING: We assume that the number of threads is the same for
568 * every CPU in the system. If that is not the case, then some code
569 * here will have to be reworked
571 cpu_init_thread_core_maps(nthreads
);
573 /* Now that possible cpus are set, set nr_cpu_ids for later use */
578 #endif /* CONFIG_SMP */
580 #ifdef CONFIG_PCSPKR_PLATFORM
581 static __init
int add_pcspkr(void)
583 struct device_node
*np
;
584 struct platform_device
*pd
;
587 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
592 pd
= platform_device_alloc("pcspkr", -1);
596 ret
= platform_device_add(pd
);
598 platform_device_put(pd
);
602 device_initcall(add_pcspkr
);
603 #endif /* CONFIG_PCSPKR_PLATFORM */
605 void probe_machine(void)
607 extern struct machdep_calls __machine_desc_start
;
608 extern struct machdep_calls __machine_desc_end
;
612 * Iterate all ppc_md structures until we find the proper
613 * one for the current machine type
615 DBG("Probing machine type ...\n");
618 * Check ppc_md is empty, if not we have a bug, ie, we setup an
619 * entry before probe_machine() which will be overwritten
621 for (i
= 0; i
< (sizeof(ppc_md
) / sizeof(void *)); i
++) {
622 if (((void **)&ppc_md
)[i
]) {
623 printk(KERN_ERR
"Entry %d in ppc_md non empty before"
624 " machine probe !\n", i
);
628 for (machine_id
= &__machine_desc_start
;
629 machine_id
< &__machine_desc_end
;
631 DBG(" %s ...", machine_id
->name
);
632 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
633 if (ppc_md
.probe()) {
639 /* What can we do if we didn't find ? */
640 if (machine_id
>= &__machine_desc_end
) {
641 DBG("No suitable machine found !\n");
645 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
648 /* Match a class of boards, not a specific device configuration. */
649 int check_legacy_ioport(unsigned long base_port
)
651 struct device_node
*parent
, *np
= NULL
;
656 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
657 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
659 parent
= of_get_parent(np
);
661 of_i8042_kbd_irq
= irq_of_parse_and_map(parent
, 0);
662 if (!of_i8042_kbd_irq
)
663 of_i8042_kbd_irq
= 1;
665 of_i8042_aux_irq
= irq_of_parse_and_map(parent
, 1);
666 if (!of_i8042_aux_irq
)
667 of_i8042_aux_irq
= 12;
673 np
= of_find_node_by_type(NULL
, "8042");
674 /* Pegasos has no device_type on its 8042 node, look for the
677 np
= of_find_node_by_name(NULL
, "8042");
679 of_i8042_kbd_irq
= 1;
680 of_i8042_aux_irq
= 12;
683 case FDC_BASE
: /* FDC1 */
684 np
= of_find_node_by_type(NULL
, "fdc");
687 /* ipmi is supposed to fail here */
692 parent
= of_get_parent(np
);
694 if (strcmp(parent
->type
, "isa") == 0)
701 EXPORT_SYMBOL(check_legacy_ioport
);
703 static int ppc_panic_event(struct notifier_block
*this,
704 unsigned long event
, void *ptr
)
707 * If firmware-assisted dump has been registered then trigger
708 * firmware-assisted dump and let firmware handle everything else.
710 crash_fadump(NULL
, ptr
);
711 ppc_md
.panic(ptr
); /* May not return */
715 static struct notifier_block ppc_panic_block
= {
716 .notifier_call
= ppc_panic_event
,
717 .priority
= INT_MIN
/* may not return; must be done last */
720 void __init
setup_panic(void)
724 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
727 #ifdef CONFIG_CHECK_CACHE_COHERENCY
729 * For platforms that have configurable cache-coherency. This function
730 * checks that the cache coherency setting of the kernel matches the setting
731 * left by the firmware, as indicated in the device tree. Since a mismatch
732 * will eventually result in DMA failures, we print * and error and call
733 * BUG() in that case.
736 #ifdef CONFIG_NOT_COHERENT_CACHE
737 #define KERNEL_COHERENCY 0
739 #define KERNEL_COHERENCY 1
742 static int __init
check_cache_coherency(void)
744 struct device_node
*np
;
746 int devtree_coherency
;
748 np
= of_find_node_by_path("/");
749 prop
= of_get_property(np
, "coherency-off", NULL
);
752 devtree_coherency
= prop
? 0 : 1;
754 if (devtree_coherency
!= KERNEL_COHERENCY
) {
756 "kernel coherency:%s != device tree_coherency:%s\n",
757 KERNEL_COHERENCY
? "on" : "off",
758 devtree_coherency
? "on" : "off");
765 late_initcall(check_cache_coherency
);
766 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
768 #ifdef CONFIG_DEBUG_FS
769 struct dentry
*powerpc_debugfs_root
;
770 EXPORT_SYMBOL(powerpc_debugfs_root
);
772 static int powerpc_debugfs_init(void)
774 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
776 return powerpc_debugfs_root
== NULL
;
778 arch_initcall(powerpc_debugfs_init
);
781 void ppc_printk_progress(char *s
, unsigned short hex
)
786 void arch_setup_pdev_archdata(struct platform_device
*pdev
)
788 pdev
->archdata
.dma_mask
= DMA_BIT_MASK(32);
789 pdev
->dev
.dma_mask
= &pdev
->archdata
.dma_mask
;
790 set_dma_ops(&pdev
->dev
, &dma_direct_ops
);
793 static __init
void print_system_info(void)
795 pr_info("-----------------------------------------------------\n");
796 #ifdef CONFIG_PPC_STD_MMU_64
797 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size
);
799 #ifdef CONFIG_PPC_STD_MMU_32
800 pr_info("Hash_size = 0x%lx\n", Hash_size
);
802 pr_info("phys_mem_size = 0x%llx\n",
803 (unsigned long long)memblock_phys_mem_size());
805 pr_info("dcache_bsize = 0x%x\n", dcache_bsize
);
806 pr_info("icache_bsize = 0x%x\n", icache_bsize
);
807 if (ucache_bsize
!= 0)
808 pr_info("ucache_bsize = 0x%x\n", ucache_bsize
);
810 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec
->cpu_features
);
811 pr_info(" possible = 0x%016lx\n",
812 (unsigned long)CPU_FTRS_POSSIBLE
);
813 pr_info(" always = 0x%016lx\n",
814 (unsigned long)CPU_FTRS_ALWAYS
);
815 pr_info("cpu_user_features = 0x%08x 0x%08x\n",
816 cur_cpu_spec
->cpu_user_features
,
817 cur_cpu_spec
->cpu_user_features2
);
818 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec
->mmu_features
);
820 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features
);
823 #ifdef CONFIG_PPC_STD_MMU_64
825 pr_info("htab_address = 0x%p\n", htab_address
);
827 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
829 #ifdef CONFIG_PPC_STD_MMU_32
831 pr_info("Hash = 0x%p\n", Hash
);
833 pr_info("Hash_mask = 0x%lx\n", Hash_mask
);
836 if (PHYSICAL_START
> 0)
837 pr_info("physical_start = 0x%llx\n",
838 (unsigned long long)PHYSICAL_START
);
839 pr_info("-----------------------------------------------------\n");
843 * Called into from start_kernel this initializes memblock, which is used
844 * to manage page allocation until mem_init is called.
846 void __init
setup_arch(char **cmdline_p
)
848 *cmdline_p
= boot_command_line
;
850 /* Set a half-reasonable default so udelay does something sensible */
851 loops_per_jiffy
= 500000000 / HZ
;
853 /* Unflatten the device-tree passed by prom_init or kexec */
854 unflatten_device_tree();
857 * Initialize cache line/block info from device-tree (on ppc64) or
858 * just cputable (on ppc32).
860 initialize_cache_info();
862 /* Initialize RTAS if available. */
865 /* Check if we have an initrd provided via the device-tree. */
868 /* Probe the machine type, establish ppc_md. */
871 /* Setup panic notifier if requested by the platform. */
875 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
876 * it from their respective probe() function.
880 /* Discover standard serial ports. */
881 find_legacy_serial_ports();
883 /* Register early console with the printk subsystem. */
884 register_early_udbg_console();
886 /* Setup the various CPU maps based on the device-tree. */
887 smp_setup_cpu_maps();
889 /* Initialize xmon. */
892 /* Check the SMT related command line arguments (ppc64). */
895 /* On BookE, setup per-core TLB data structures. */
896 setup_tlb_core_data();
899 * Release secondary cpus out of their spinloops at 0x60 now that
900 * we can map physical -> logical CPU ids.
902 * Freescale Book3e parts spin in a loop provided by firmware,
903 * so smp_release_cpus() does nothing for them.
909 /* Print various info about the machine that has been gathered so far. */
912 /* Reserve large chunks of memory for use by CMA for KVM. */
916 * Reserve any gigantic pages requested on the command line.
917 * memblock needs to have been initialized by the time this is
918 * called since this will reserve memory.
920 reserve_hugetlb_gpages();
922 klp_init_thread_info(&init_thread_info
);
924 init_mm
.start_code
= (unsigned long)_stext
;
925 init_mm
.end_code
= (unsigned long) _etext
;
926 init_mm
.end_data
= (unsigned long) _edata
;
927 init_mm
.brk
= klimit
;
929 #ifdef CONFIG_PPC_MM_SLICES
931 init_mm
.context
.addr_limit
= TASK_SIZE_128TB
;
933 #error "context.addr_limit not initialized."
937 #ifdef CONFIG_PPC_64K_PAGES
938 init_mm
.context
.pte_frag
= NULL
;
940 #ifdef CONFIG_SPAPR_TCE_IOMMU
941 mm_iommu_init(&init_mm
);
943 irqstack_early_init();
944 exc_lvl_early_init();
945 emergency_stack_init();
949 #ifdef CONFIG_DUMMY_CONSOLE
950 conswitchp
= &dummy_con
;
952 if (ppc_md
.setup_arch
)
957 /* Initialize the MMU context management stuff. */
961 /* Interrupt code needs to be 64K-aligned. */
962 if ((unsigned long)_stext
& 0xffff)
963 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
964 (unsigned long)_stext
);