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 int boot_hw_cpuid
= -1;
89 EXPORT_SYMBOL_GPL(boot_cpuid
);
92 * These are used in binfmt_elf.c to put aux entries on the stack
93 * for each elf executable being started.
100 unsigned long klimit
= (unsigned long) _end
;
103 * This still seems to be needed... -- paulus
105 struct screen_info screen_info
= {
108 .orig_video_cols
= 80,
109 .orig_video_lines
= 25,
110 .orig_video_isVGA
= 1,
111 .orig_video_points
= 16
113 #if defined(CONFIG_FB_VGA16_MODULE)
114 EXPORT_SYMBOL(screen_info
);
117 /* Variables required to store legacy IO irq routing */
118 int of_i8042_kbd_irq
;
119 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq
);
120 int of_i8042_aux_irq
;
121 EXPORT_SYMBOL_GPL(of_i8042_aux_irq
);
123 #ifdef __DO_IRQ_CANON
124 /* XXX should go elsewhere eventually */
125 int ppc_do_canonicalize_irqs
;
126 EXPORT_SYMBOL(ppc_do_canonicalize_irqs
);
129 #ifdef CONFIG_CRASH_CORE
130 /* This keeps a track of which one is the crashing cpu. */
131 int crashing_cpu
= -1;
134 /* also used by kexec */
135 void machine_shutdown(void)
137 #ifdef CONFIG_FA_DUMP
139 * if fadump is active, cleanup the fadump registration before we
145 if (ppc_md
.machine_shutdown
)
146 ppc_md
.machine_shutdown();
149 static void machine_hang(void)
151 pr_emerg("System Halted, OK to turn off power\n");
157 void machine_restart(char *cmd
)
165 do_kernel_restart(cmd
);
171 void machine_power_off(void)
180 /* Used by the G5 thermal driver */
181 EXPORT_SYMBOL_GPL(machine_power_off
);
183 void (*pm_power_off
)(void);
184 EXPORT_SYMBOL_GPL(pm_power_off
);
186 void machine_halt(void)
198 extern u32
cpu_temp(unsigned long cpu
);
199 extern u32
cpu_temp_both(unsigned long cpu
);
200 #endif /* CONFIG_TAU */
203 DEFINE_PER_CPU(unsigned int, cpu_pvr
);
206 static void show_cpuinfo_summary(struct seq_file
*m
)
208 struct device_node
*root
;
209 const char *model
= NULL
;
210 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
211 unsigned long bogosum
= 0;
213 for_each_online_cpu(i
)
214 bogosum
+= loops_per_jiffy
;
215 seq_printf(m
, "total bogomips\t: %lu.%02lu\n",
216 bogosum
/(500000/HZ
), bogosum
/(5000/HZ
) % 100);
217 #endif /* CONFIG_SMP && CONFIG_PPC32 */
218 seq_printf(m
, "timebase\t: %lu\n", ppc_tb_freq
);
220 seq_printf(m
, "platform\t: %s\n", ppc_md
.name
);
221 root
= of_find_node_by_path("/");
223 model
= of_get_property(root
, "model", NULL
);
225 seq_printf(m
, "model\t\t: %s\n", model
);
228 if (ppc_md
.show_cpuinfo
!= NULL
)
229 ppc_md
.show_cpuinfo(m
);
232 /* Display the amount of memory */
233 seq_printf(m
, "Memory\t\t: %d MB\n",
234 (unsigned int)(total_memory
/ (1024 * 1024)));
238 static int show_cpuinfo(struct seq_file
*m
, void *v
)
240 unsigned long cpu_id
= (unsigned long)v
- 1;
242 unsigned long proc_freq
;
247 pvr
= per_cpu(cpu_pvr
, cpu_id
);
249 pvr
= mfspr(SPRN_PVR
);
251 maj
= (pvr
>> 8) & 0xFF;
254 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
255 seq_printf(m
, "cpu\t\t: ");
257 if (cur_cpu_spec
->pvr_mask
&& cur_cpu_spec
->cpu_name
)
258 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
260 seq_printf(m
, "unknown (%08x)", pvr
);
262 #ifdef CONFIG_ALTIVEC
263 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
264 seq_printf(m
, ", altivec supported");
265 #endif /* CONFIG_ALTIVEC */
270 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
271 #ifdef CONFIG_TAU_AVERAGE
272 /* more straightforward, but potentially misleading */
273 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
276 /* show the actual temp sensor range */
278 temp
= cpu_temp_both(cpu_id
);
279 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
280 temp
& 0xff, temp
>> 16);
283 #endif /* CONFIG_TAU */
286 * Platforms that have variable clock rates, should implement
287 * the method ppc_md.get_proc_freq() that reports the clock
288 * rate of a given cpu. The rest can use ppc_proc_freq to
289 * report the clock rate that is same across all cpus.
291 if (ppc_md
.get_proc_freq
)
292 proc_freq
= ppc_md
.get_proc_freq(cpu_id
);
294 proc_freq
= ppc_proc_freq
;
297 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
298 proc_freq
/ 1000000, proc_freq
% 1000000);
300 if (ppc_md
.show_percpuinfo
!= NULL
)
301 ppc_md
.show_percpuinfo(m
, cpu_id
);
303 /* If we are a Freescale core do a simple check so
304 * we dont have to keep adding cases in the future */
305 if (PVR_VER(pvr
) & 0x8000) {
306 switch (PVR_VER(pvr
)) {
307 case 0x8000: /* 7441/7450/7451, Voyager */
308 case 0x8001: /* 7445/7455, Apollo 6 */
309 case 0x8002: /* 7447/7457, Apollo 7 */
310 case 0x8003: /* 7447A, Apollo 7 PM */
311 case 0x8004: /* 7448, Apollo 8 */
312 case 0x800c: /* 7410, Nitro */
313 maj
= ((pvr
>> 8) & 0xF);
316 default: /* e500/book-e */
322 switch (PVR_VER(pvr
)) {
323 case 0x0020: /* 403 family */
324 maj
= PVR_MAJ(pvr
) + 1;
327 case 0x1008: /* 740P/750P ?? */
328 maj
= ((pvr
>> 8) & 0xFF) - 1;
331 case 0x004e: /* POWER9 bits 12-15 give chip type */
332 maj
= (pvr
>> 8) & 0x0F;
336 maj
= (pvr
>> 8) & 0xFF;
342 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
343 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
346 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
347 loops_per_jiffy
/ (500000/HZ
),
348 (loops_per_jiffy
/ (5000/HZ
)) % 100);
354 /* If this is the last cpu, print the summary */
355 if (cpumask_next(cpu_id
, cpu_online_mask
) >= nr_cpu_ids
)
356 show_cpuinfo_summary(m
);
361 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
363 if (*pos
== 0) /* just in case, cpu 0 is not the first */
364 *pos
= cpumask_first(cpu_online_mask
);
366 *pos
= cpumask_next(*pos
- 1, cpu_online_mask
);
367 if ((*pos
) < nr_cpu_ids
)
368 return (void *)(unsigned long)(*pos
+ 1);
372 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
375 return c_start(m
, pos
);
378 static void c_stop(struct seq_file
*m
, void *v
)
382 const struct seq_operations cpuinfo_op
= {
386 .show
= show_cpuinfo
,
389 void __init
check_for_initrd(void)
391 #ifdef CONFIG_BLK_DEV_INITRD
392 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
393 initrd_start
, initrd_end
);
395 /* If we were passed an initrd, set the ROOT_DEV properly if the values
396 * look sensible. If not, clear initrd reference.
398 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
399 initrd_end
> initrd_start
)
400 ROOT_DEV
= Root_RAM0
;
402 initrd_start
= initrd_end
= 0;
405 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
407 DBG(" <- check_for_initrd()\n");
408 #endif /* CONFIG_BLK_DEV_INITRD */
413 int threads_per_core
, threads_per_subcore
, threads_shift
;
414 cpumask_t threads_core_mask
;
415 EXPORT_SYMBOL_GPL(threads_per_core
);
416 EXPORT_SYMBOL_GPL(threads_per_subcore
);
417 EXPORT_SYMBOL_GPL(threads_shift
);
418 EXPORT_SYMBOL_GPL(threads_core_mask
);
420 static void __init
cpu_init_thread_core_maps(int tpc
)
424 threads_per_core
= tpc
;
425 threads_per_subcore
= tpc
;
426 cpumask_clear(&threads_core_mask
);
428 /* This implementation only supports power of 2 number of threads
429 * for simplicity and performance
431 threads_shift
= ilog2(tpc
);
432 BUG_ON(tpc
!= (1 << threads_shift
));
434 for (i
= 0; i
< tpc
; i
++)
435 cpumask_set_cpu(i
, &threads_core_mask
);
437 printk(KERN_INFO
"CPU maps initialized for %d thread%s per core\n",
438 tpc
, tpc
> 1 ? "s" : "");
439 printk(KERN_DEBUG
" (thread shift is %d)\n", threads_shift
);
444 * setup_cpu_maps - initialize the following cpu maps:
448 * Having the possible map set up early allows us to restrict allocations
449 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
451 * We do not initialize the online map here; cpus set their own bits in
452 * cpu_online_mask as they come up.
454 * This function is valid only for Open Firmware systems. finish_device_tree
455 * must be called before using this.
457 * While we're here, we may as well set the "physical" cpu ids in the paca.
459 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
461 void __init
smp_setup_cpu_maps(void)
463 struct device_node
*dn
= NULL
;
466 bool boot_cpu_added
= false;
468 DBG("smp_setup_cpu_maps()\n");
470 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< nr_cpu_ids
) {
471 const __be32
*intserv
;
475 DBG(" * %pOF...\n", dn
);
477 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
480 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
483 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
484 intserv
= of_get_property(dn
, "reg", &len
);
486 cpu_be
= cpu_to_be32(cpu
);
487 intserv
= &cpu_be
; /* assume logical == phys */
492 nthreads
= len
/ sizeof(int);
494 * If boot cpu hasn't been added to paca and there are only
495 * last nthreads slots available in paca array then wait
496 * for boot cpu to show up.
498 if (!boot_cpu_added
&& (cpu
+ nthreads
) >= nr_cpu_ids
) {
501 DBG("Holding last nthreads paca slots for boot cpu\n");
502 for (j
= 0; j
< nthreads
&& cpu
< nr_cpu_ids
; j
++) {
503 if (boot_hw_cpuid
== be32_to_cpu(intserv
[j
])) {
512 for (j
= 0; j
< nthreads
&& cpu
< nr_cpu_ids
; j
++) {
515 DBG(" thread %d -> cpu %d (hard id %d)\n",
516 j
, cpu
, be32_to_cpu(intserv
[j
]));
518 avail
= of_device_is_available(dn
);
520 avail
= !of_property_match_string(dn
,
521 "enable-method", "spin-table");
523 set_cpu_present(cpu
, avail
);
524 set_hard_smp_processor_id(cpu
, be32_to_cpu(intserv
[j
]));
525 set_cpu_possible(cpu
, true);
526 if (boot_hw_cpuid
== be32_to_cpu(intserv
[j
])) {
527 DBG("Boot cpu %d (hard id %d) added to paca\n",
528 cpu
, be32_to_cpu(intserv
[j
]));
529 boot_cpu_added
= true;
535 /* If no SMT supported, nthreads is forced to 1 */
536 if (!cpu_has_feature(CPU_FTR_SMT
)) {
537 DBG(" SMT disabled ! nthreads forced to 1\n");
543 * On pSeries LPAR, we need to know how many cpus
544 * could possibly be added to this partition.
546 if (firmware_has_feature(FW_FEATURE_LPAR
) &&
547 (dn
= of_find_node_by_path("/rtas"))) {
548 int num_addr_cell
, num_size_cell
, maxcpus
;
551 num_addr_cell
= of_n_addr_cells(dn
);
552 num_size_cell
= of_n_size_cells(dn
);
554 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
559 maxcpus
= be32_to_cpup(ireg
+ num_addr_cell
+ num_size_cell
);
561 /* Double maxcpus for processors which have SMT capability */
562 if (cpu_has_feature(CPU_FTR_SMT
))
565 if (maxcpus
> nr_cpu_ids
) {
567 "Partition configured for %d cpus, "
568 "operating system maximum is %u.\n",
569 maxcpus
, nr_cpu_ids
);
570 maxcpus
= nr_cpu_ids
;
572 printk(KERN_INFO
"Partition configured for %d cpus.\n",
575 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
576 set_cpu_possible(cpu
, true);
580 vdso_data
->processorCount
= num_present_cpus();
581 #endif /* CONFIG_PPC64 */
583 /* Initialize CPU <=> thread mapping/
585 * WARNING: We assume that the number of threads is the same for
586 * every CPU in the system. If that is not the case, then some code
587 * here will have to be reworked
589 cpu_init_thread_core_maps(nthreads
);
591 /* Now that possible cpus are set, set nr_cpu_ids for later use */
596 #endif /* CONFIG_SMP */
598 #ifdef CONFIG_PCSPKR_PLATFORM
599 static __init
int add_pcspkr(void)
601 struct device_node
*np
;
602 struct platform_device
*pd
;
605 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
610 pd
= platform_device_alloc("pcspkr", -1);
614 ret
= platform_device_add(pd
);
616 platform_device_put(pd
);
620 device_initcall(add_pcspkr
);
621 #endif /* CONFIG_PCSPKR_PLATFORM */
623 void probe_machine(void)
625 extern struct machdep_calls __machine_desc_start
;
626 extern struct machdep_calls __machine_desc_end
;
630 * Iterate all ppc_md structures until we find the proper
631 * one for the current machine type
633 DBG("Probing machine type ...\n");
636 * Check ppc_md is empty, if not we have a bug, ie, we setup an
637 * entry before probe_machine() which will be overwritten
639 for (i
= 0; i
< (sizeof(ppc_md
) / sizeof(void *)); i
++) {
640 if (((void **)&ppc_md
)[i
]) {
641 printk(KERN_ERR
"Entry %d in ppc_md non empty before"
642 " machine probe !\n", i
);
646 for (machine_id
= &__machine_desc_start
;
647 machine_id
< &__machine_desc_end
;
649 DBG(" %s ...", machine_id
->name
);
650 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
651 if (ppc_md
.probe()) {
657 /* What can we do if we didn't find ? */
658 if (machine_id
>= &__machine_desc_end
) {
659 DBG("No suitable machine found !\n");
663 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
666 /* Match a class of boards, not a specific device configuration. */
667 int check_legacy_ioport(unsigned long base_port
)
669 struct device_node
*parent
, *np
= NULL
;
674 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
675 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
677 parent
= of_get_parent(np
);
679 of_i8042_kbd_irq
= irq_of_parse_and_map(parent
, 0);
680 if (!of_i8042_kbd_irq
)
681 of_i8042_kbd_irq
= 1;
683 of_i8042_aux_irq
= irq_of_parse_and_map(parent
, 1);
684 if (!of_i8042_aux_irq
)
685 of_i8042_aux_irq
= 12;
691 np
= of_find_node_by_type(NULL
, "8042");
692 /* Pegasos has no device_type on its 8042 node, look for the
695 np
= of_find_node_by_name(NULL
, "8042");
697 of_i8042_kbd_irq
= 1;
698 of_i8042_aux_irq
= 12;
701 case FDC_BASE
: /* FDC1 */
702 np
= of_find_node_by_type(NULL
, "fdc");
705 /* ipmi is supposed to fail here */
710 parent
= of_get_parent(np
);
712 if (strcmp(parent
->type
, "isa") == 0)
719 EXPORT_SYMBOL(check_legacy_ioport
);
721 static int ppc_panic_event(struct notifier_block
*this,
722 unsigned long event
, void *ptr
)
725 * If firmware-assisted dump has been registered then trigger
726 * firmware-assisted dump and let firmware handle everything else.
728 crash_fadump(NULL
, ptr
);
729 ppc_md
.panic(ptr
); /* May not return */
733 static struct notifier_block ppc_panic_block
= {
734 .notifier_call
= ppc_panic_event
,
735 .priority
= INT_MIN
/* may not return; must be done last */
738 void __init
setup_panic(void)
742 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
745 #ifdef CONFIG_CHECK_CACHE_COHERENCY
747 * For platforms that have configurable cache-coherency. This function
748 * checks that the cache coherency setting of the kernel matches the setting
749 * left by the firmware, as indicated in the device tree. Since a mismatch
750 * will eventually result in DMA failures, we print * and error and call
751 * BUG() in that case.
754 #ifdef CONFIG_NOT_COHERENT_CACHE
755 #define KERNEL_COHERENCY 0
757 #define KERNEL_COHERENCY 1
760 static int __init
check_cache_coherency(void)
762 struct device_node
*np
;
764 int devtree_coherency
;
766 np
= of_find_node_by_path("/");
767 prop
= of_get_property(np
, "coherency-off", NULL
);
770 devtree_coherency
= prop
? 0 : 1;
772 if (devtree_coherency
!= KERNEL_COHERENCY
) {
774 "kernel coherency:%s != device tree_coherency:%s\n",
775 KERNEL_COHERENCY
? "on" : "off",
776 devtree_coherency
? "on" : "off");
783 late_initcall(check_cache_coherency
);
784 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
786 #ifdef CONFIG_DEBUG_FS
787 struct dentry
*powerpc_debugfs_root
;
788 EXPORT_SYMBOL(powerpc_debugfs_root
);
790 static int powerpc_debugfs_init(void)
792 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
794 return powerpc_debugfs_root
== NULL
;
796 arch_initcall(powerpc_debugfs_init
);
799 void ppc_printk_progress(char *s
, unsigned short hex
)
804 void arch_setup_pdev_archdata(struct platform_device
*pdev
)
806 pdev
->archdata
.dma_mask
= DMA_BIT_MASK(32);
807 pdev
->dev
.dma_mask
= &pdev
->archdata
.dma_mask
;
808 set_dma_ops(&pdev
->dev
, &dma_direct_ops
);
811 static __init
void print_system_info(void)
813 pr_info("-----------------------------------------------------\n");
814 #ifdef CONFIG_PPC_BOOK3S_64
815 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size
);
817 #ifdef CONFIG_PPC_STD_MMU_32
818 pr_info("Hash_size = 0x%lx\n", Hash_size
);
820 pr_info("phys_mem_size = 0x%llx\n",
821 (unsigned long long)memblock_phys_mem_size());
823 pr_info("dcache_bsize = 0x%x\n", dcache_bsize
);
824 pr_info("icache_bsize = 0x%x\n", icache_bsize
);
825 if (ucache_bsize
!= 0)
826 pr_info("ucache_bsize = 0x%x\n", ucache_bsize
);
828 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec
->cpu_features
);
829 pr_info(" possible = 0x%016lx\n",
830 (unsigned long)CPU_FTRS_POSSIBLE
);
831 pr_info(" always = 0x%016lx\n",
832 (unsigned long)CPU_FTRS_ALWAYS
);
833 pr_info("cpu_user_features = 0x%08x 0x%08x\n",
834 cur_cpu_spec
->cpu_user_features
,
835 cur_cpu_spec
->cpu_user_features2
);
836 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec
->mmu_features
);
838 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features
);
841 #ifdef CONFIG_PPC_BOOK3S_64
843 pr_info("htab_address = 0x%p\n", htab_address
);
845 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
847 #ifdef CONFIG_PPC_STD_MMU_32
849 pr_info("Hash = 0x%p\n", Hash
);
851 pr_info("Hash_mask = 0x%lx\n", Hash_mask
);
854 if (PHYSICAL_START
> 0)
855 pr_info("physical_start = 0x%llx\n",
856 (unsigned long long)PHYSICAL_START
);
857 pr_info("-----------------------------------------------------\n");
861 * Called into from start_kernel this initializes memblock, which is used
862 * to manage page allocation until mem_init is called.
864 void __init
setup_arch(char **cmdline_p
)
866 *cmdline_p
= boot_command_line
;
868 /* Set a half-reasonable default so udelay does something sensible */
869 loops_per_jiffy
= 500000000 / HZ
;
871 /* Unflatten the device-tree passed by prom_init or kexec */
872 unflatten_device_tree();
875 * Initialize cache line/block info from device-tree (on ppc64) or
876 * just cputable (on ppc32).
878 initialize_cache_info();
880 /* Initialize RTAS if available. */
883 /* Check if we have an initrd provided via the device-tree. */
886 /* Probe the machine type, establish ppc_md. */
889 /* Setup panic notifier if requested by the platform. */
893 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
894 * it from their respective probe() function.
898 /* Discover standard serial ports. */
899 find_legacy_serial_ports();
901 /* Register early console with the printk subsystem. */
902 register_early_udbg_console();
904 /* Setup the various CPU maps based on the device-tree. */
905 smp_setup_cpu_maps();
907 /* Initialize xmon. */
910 /* Check the SMT related command line arguments (ppc64). */
913 /* On BookE, setup per-core TLB data structures. */
914 setup_tlb_core_data();
917 * Release secondary cpus out of their spinloops at 0x60 now that
918 * we can map physical -> logical CPU ids.
920 * Freescale Book3e parts spin in a loop provided by firmware,
921 * so smp_release_cpus() does nothing for them.
927 /* Print various info about the machine that has been gathered so far. */
930 /* Reserve large chunks of memory for use by CMA for KVM. */
933 klp_init_thread_info(&init_thread_info
);
935 init_mm
.start_code
= (unsigned long)_stext
;
936 init_mm
.end_code
= (unsigned long) _etext
;
937 init_mm
.end_data
= (unsigned long) _edata
;
938 init_mm
.brk
= klimit
;
940 #ifdef CONFIG_PPC_MM_SLICES
942 if (!radix_enabled())
943 init_mm
.context
.slb_addr_limit
= DEFAULT_MAP_WINDOW_USER64
;
944 #elif defined(CONFIG_PPC_8xx)
945 init_mm
.context
.slb_addr_limit
= DEFAULT_MAP_WINDOW
;
947 #error "context.addr_limit not initialized."
951 #ifdef CONFIG_SPAPR_TCE_IOMMU
952 mm_iommu_init(&init_mm
);
954 irqstack_early_init();
955 exc_lvl_early_init();
956 emergency_stack_init();
960 #ifdef CONFIG_DUMMY_CONSOLE
961 conswitchp
= &dummy_con
;
963 if (ppc_md
.setup_arch
)
968 /* Initialize the MMU context management stuff. */
972 /* Interrupt code needs to be 64K-aligned. */
973 if ((unsigned long)_stext
& 0xffff)
974 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
975 (unsigned long)_stext
);