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>
37 #include <asm/kdump.h>
39 #include <asm/processor.h>
40 #include <asm/pgtable.h>
43 #include <asm/machdep.h>
46 #include <asm/cputable.h>
47 #include <asm/sections.h>
48 #include <asm/btext.h>
49 #include <asm/nvram.h>
50 #include <asm/setup.h>
51 #include <asm/system.h>
53 #include <asm/iommu.h>
54 #include <asm/serial.h>
55 #include <asm/cache.h>
59 #include <asm/iseries/it_lp_naca.h>
60 #include <asm/firmware.h>
63 #include <asm/kexec.h>
68 #define DBG(fmt...) udbg_printf(fmt)
74 * Here are some early debugging facilities. You can enable one
75 * but your kernel will not boot on anything else if you do so
78 /* This one is for use on LPAR machines that support an HVC console
81 extern void udbg_init_debug_lpar(void);
82 /* This one is for use on Apple G5 machines
84 extern void udbg_init_pmac_realmode(void);
85 /* That's RTAS panel debug */
86 extern void call_rtas_display_status_delay(unsigned char c
);
87 /* Here's maple real mode debug */
88 extern void udbg_init_maple_realmode(void);
90 #define EARLY_DEBUG_INIT() do {} while(0)
93 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
94 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
95 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
96 #define EARLY_DEBUG_INIT() \
97 do { udbg_putc = call_rtas_display_status_delay; } while(0)
102 int boot_cpuid_phys
= 0;
106 /* Pick defaults since we might want to patch instructions
107 * before we've read this from the device tree.
109 struct ppc64_caches ppc64_caches
= {
115 EXPORT_SYMBOL_GPL(ppc64_caches
);
118 * These are used in binfmt_elf.c to put aux entries on the stack
119 * for each elf executable being started.
125 /* The main machine-dep calls structure
127 struct machdep_calls ppc_md
;
128 EXPORT_SYMBOL(ppc_md
);
130 #ifdef CONFIG_MAGIC_SYSRQ
131 unsigned long SYSRQ_KEY
;
132 #endif /* CONFIG_MAGIC_SYSRQ */
135 static int ppc64_panic_event(struct notifier_block
*, unsigned long, void *);
136 static struct notifier_block ppc64_panic_block
= {
137 .notifier_call
= ppc64_panic_event
,
138 .priority
= INT_MIN
/* may not return; must be done last */
143 static int smt_enabled_cmdline
;
145 /* Look for ibm,smt-enabled OF option */
146 static void check_smt_enabled(void)
148 struct device_node
*dn
;
151 /* Allow the command line to overrule the OF option */
152 if (smt_enabled_cmdline
)
155 dn
= of_find_node_by_path("/options");
158 smt_option
= (char *)get_property(dn
, "ibm,smt-enabled", NULL
);
161 if (!strcmp(smt_option
, "on"))
162 smt_enabled_at_boot
= 1;
163 else if (!strcmp(smt_option
, "off"))
164 smt_enabled_at_boot
= 0;
169 /* Look for smt-enabled= cmdline option */
170 static int __init
early_smt_enabled(char *p
)
172 smt_enabled_cmdline
= 1;
177 if (!strcmp(p
, "on") || !strcmp(p
, "1"))
178 smt_enabled_at_boot
= 1;
179 else if (!strcmp(p
, "off") || !strcmp(p
, "0"))
180 smt_enabled_at_boot
= 0;
184 early_param("smt-enabled", early_smt_enabled
);
187 #define check_smt_enabled()
188 #endif /* CONFIG_SMP */
190 extern struct machdep_calls pSeries_md
;
191 extern struct machdep_calls pmac_md
;
192 extern struct machdep_calls maple_md
;
193 extern struct machdep_calls cell_md
;
194 extern struct machdep_calls iseries_md
;
196 /* Ultimately, stuff them in an elf section like initcalls... */
197 static struct machdep_calls __initdata
*machines
[] = {
198 #ifdef CONFIG_PPC_PSERIES
200 #endif /* CONFIG_PPC_PSERIES */
201 #ifdef CONFIG_PPC_PMAC
203 #endif /* CONFIG_PPC_PMAC */
204 #ifdef CONFIG_PPC_MAPLE
206 #endif /* CONFIG_PPC_MAPLE */
207 #ifdef CONFIG_PPC_CELL
210 #ifdef CONFIG_PPC_ISERIES
217 * Early initialization entry point. This is called by head.S
218 * with MMU translation disabled. We rely on the "feature" of
219 * the CPU that ignores the top 2 bits of the address in real
220 * mode so we can access kernel globals normally provided we
221 * only toy with things in the RMO region. From here, we do
222 * some early parsing of the device-tree to setup out LMB
223 * data structures, and allocate & initialize the hash table
224 * and segment tables so we can start running with translation
227 * It is this function which will call the probe() callback of
228 * the various platform types and copy the matching one to the
229 * global ppc_md structure. Your platform can eventually do
230 * some very early initializations from the probe() routine, but
231 * this is not recommended, be very careful as, for example, the
232 * device-tree is not accessible via normal means at this point.
235 void __init
early_setup(unsigned long dt_ptr
)
237 struct paca_struct
*lpaca
= get_paca();
238 static struct machdep_calls
**mach
;
241 * Enable early debugging if any specified (see top of
246 DBG(" -> early_setup()\n");
249 * Do early initializations using the flattened device
250 * tree, like retreiving the physical memory map or
251 * calculating/retreiving the hash table size
253 early_init_devtree(__va(dt_ptr
));
256 * Iterate all ppc_md structures until we find the proper
257 * one for the current machine type
259 DBG("Probing machine type for platform %x...\n", _machine
);
261 for (mach
= machines
; *mach
; mach
++) {
262 if ((*mach
)->probe(_machine
))
265 /* What can we do if we didn't find ? */
267 DBG("No suitable machine found !\n");
272 #ifdef CONFIG_CRASH_DUMP
276 DBG("Found, Initializing memory management...\n");
279 * Initialize the MMU Hash table and create the linear mapping
280 * of memory. Has to be done before stab/slb initialization as
281 * this is currently where the page size encoding is obtained
286 * Initialize stab / SLB management except on iSeries
288 if (!firmware_has_feature(FW_FEATURE_ISERIES
)) {
289 if (cpu_has_feature(CPU_FTR_SLB
))
292 stab_initialize(lpaca
->stab_real
);
295 DBG(" <- early_setup()\n");
299 void early_setup_secondary(void)
301 struct paca_struct
*lpaca
= get_paca();
303 /* Mark enabled in PACA */
304 lpaca
->proc_enabled
= 0;
306 /* Initialize hash table for that CPU */
307 htab_initialize_secondary();
309 /* Initialize STAB/SLB. We use a virtual address as it works
310 * in real mode on pSeries and we want a virutal address on
313 if (cpu_has_feature(CPU_FTR_SLB
))
316 stab_initialize(lpaca
->stab_addr
);
319 #endif /* CONFIG_SMP */
321 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
322 void smp_release_cpus(void)
324 extern unsigned long __secondary_hold_spinloop
;
327 DBG(" -> smp_release_cpus()\n");
329 /* All secondary cpus are spinning on a common spinloop, release them
330 * all now so they can start to spin on their individual paca
331 * spinloops. For non SMP kernels, the secondary cpus never get out
332 * of the common spinloop.
333 * This is useless but harmless on iSeries, secondaries are already
334 * waiting on their paca spinloops. */
336 ptr
= (unsigned long *)((unsigned long)&__secondary_hold_spinloop
341 DBG(" <- smp_release_cpus()\n");
344 #define smp_release_cpus()
345 #endif /* CONFIG_SMP || CONFIG_KEXEC */
348 * Initialize some remaining members of the ppc64_caches and systemcfg
350 * (at least until we get rid of them completely). This is mostly some
351 * cache informations about the CPU that will be used by cache flush
352 * routines and/or provided to userland
354 static void __init
initialize_cache_info(void)
356 struct device_node
*np
;
357 unsigned long num_cpus
= 0;
359 DBG(" -> initialize_cache_info()\n");
361 for (np
= NULL
; (np
= of_find_node_by_type(np
, "cpu"));) {
364 /* We're assuming *all* of the CPUs have the same
365 * d-cache and i-cache sizes... -Peter
368 if ( num_cpus
== 1 ) {
373 /* Then read cache informations */
374 if (_machine
== PLATFORM_POWERMAC
) {
375 dc
= "d-cache-block-size";
376 ic
= "i-cache-block-size";
378 dc
= "d-cache-line-size";
379 ic
= "i-cache-line-size";
383 lsize
= cur_cpu_spec
->dcache_bsize
;
384 sizep
= (u32
*)get_property(np
, "d-cache-size", NULL
);
387 lsizep
= (u32
*) get_property(np
, dc
, NULL
);
390 if (sizep
== 0 || lsizep
== 0)
391 DBG("Argh, can't find dcache properties ! "
392 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
394 ppc64_caches
.dsize
= size
;
395 ppc64_caches
.dline_size
= lsize
;
396 ppc64_caches
.log_dline_size
= __ilog2(lsize
);
397 ppc64_caches
.dlines_per_page
= PAGE_SIZE
/ lsize
;
400 lsize
= cur_cpu_spec
->icache_bsize
;
401 sizep
= (u32
*)get_property(np
, "i-cache-size", NULL
);
404 lsizep
= (u32
*)get_property(np
, ic
, NULL
);
407 if (sizep
== 0 || lsizep
== 0)
408 DBG("Argh, can't find icache properties ! "
409 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
411 ppc64_caches
.isize
= size
;
412 ppc64_caches
.iline_size
= lsize
;
413 ppc64_caches
.log_iline_size
= __ilog2(lsize
);
414 ppc64_caches
.ilines_per_page
= PAGE_SIZE
/ lsize
;
418 DBG(" <- initialize_cache_info()\n");
423 * Do some initial setup of the system. The parameters are those which
424 * were passed in from the bootloader.
426 void __init
setup_system(void)
428 DBG(" -> setup_system()\n");
431 * Unflatten the device-tree passed by prom_init or kexec
433 unflatten_device_tree();
436 kexec_setup(); /* requires unflattened device tree. */
440 * Fill the ppc64_caches & systemcfg structures with informations
441 * retrieved from the device-tree. Need to be called before
442 * finish_device_tree() since the later requires some of the
443 * informations filled up here to properly parse the interrupt
445 * It also sets up the cache line sizes which allows to call
446 * routines like flush_icache_range (used by the hash init
449 initialize_cache_info();
451 #ifdef CONFIG_PPC_RTAS
453 * Initialize RTAS if available
456 #endif /* CONFIG_PPC_RTAS */
459 * Check if we have an initrd provided via the device-tree
464 * Do some platform specific early initializations, that includes
465 * setting up the hash table pointers. It also sets up some interrupt-mapping
466 * related options that will be used by finish_device_tree()
471 * We can discover serial ports now since the above did setup the
472 * hash table management for us, thus ioremap works. We do that early
473 * so that further code can be debugged
475 #ifdef CONFIG_SERIAL_8250
476 find_legacy_serial_ports();
480 * "Finish" the device-tree, that is do the actual parsing of
481 * some of the properties like the interrupt map
483 finish_device_tree();
488 #ifdef CONFIG_XMON_DEFAULT
492 * Register early console
494 register_early_udbg_console();
496 /* Save unparsed command line copy for /proc/cmdline */
497 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
502 smp_setup_cpu_maps();
504 /* Release secondary cpus out of their spinloops at 0x60 now that
505 * we can map physical -> logical CPU ids
509 printk("Starting Linux PPC64 %s\n", system_utsname
.version
);
511 printk("-----------------------------------------------------\n");
512 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size
);
513 printk("ppc64_interrupt_controller = 0x%ld\n",
514 ppc64_interrupt_controller
);
515 printk("platform = 0x%x\n", _machine
);
516 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
517 printk("ppc64_caches.dcache_line_size = 0x%x\n",
518 ppc64_caches
.dline_size
);
519 printk("ppc64_caches.icache_line_size = 0x%x\n",
520 ppc64_caches
.iline_size
);
521 printk("htab_address = 0x%p\n", htab_address
);
522 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
523 #if PHYSICAL_START > 0
524 printk("physical_start = 0x%x\n", PHYSICAL_START
);
526 printk("-----------------------------------------------------\n");
530 DBG(" <- setup_system()\n");
533 static int ppc64_panic_event(struct notifier_block
*this,
534 unsigned long event
, void *ptr
)
536 ppc_md
.panic((char *)ptr
); /* May not return */
540 #ifdef CONFIG_IRQSTACKS
541 static void __init
irqstack_early_init(void)
546 * interrupt stacks must be under 256MB, we cannot afford to take
547 * SLB misses on them.
550 softirq_ctx
[i
] = (struct thread_info
*)
551 __va(lmb_alloc_base(THREAD_SIZE
,
552 THREAD_SIZE
, 0x10000000));
553 hardirq_ctx
[i
] = (struct thread_info
*)
554 __va(lmb_alloc_base(THREAD_SIZE
,
555 THREAD_SIZE
, 0x10000000));
559 #define irqstack_early_init()
563 * Stack space used when we detect a bad kernel stack pointer, and
564 * early in SMP boots before relocation is enabled.
566 static void __init
emergency_stack_init(void)
572 * Emergency stacks must be under 256MB, we cannot afford to take
573 * SLB misses on them. The ABI also requires them to be 128-byte
576 * Since we use these as temporary stacks during secondary CPU
577 * bringup, we need to get at them in real mode. This means they
578 * must also be within the RMO region.
580 limit
= min(0x10000000UL
, lmb
.rmo_size
);
583 paca
[i
].emergency_sp
=
584 __va(lmb_alloc_base(HW_PAGE_SIZE
, 128, limit
)) + HW_PAGE_SIZE
;
588 * Called into from start_kernel, after lock_kernel has been called.
589 * Initializes bootmem, which is unsed to manage page allocation until
590 * mem_init is called.
592 void __init
setup_arch(char **cmdline_p
)
594 extern void do_init_bootmem(void);
596 ppc64_boot_msg(0x12, "Setup Arch");
598 *cmdline_p
= cmd_line
;
601 * Set cache line size based on type of cpu as a default.
602 * Systems with OF can look in the properties on the cpu node(s)
603 * for a possibly more accurate value.
605 dcache_bsize
= ppc64_caches
.dline_size
;
606 icache_bsize
= ppc64_caches
.iline_size
;
608 /* reboot on panic */
612 notifier_chain_register(&panic_notifier_list
, &ppc64_panic_block
);
614 init_mm
.start_code
= PAGE_OFFSET
;
615 init_mm
.end_code
= (unsigned long) _etext
;
616 init_mm
.end_data
= (unsigned long) _edata
;
617 init_mm
.brk
= klimit
;
619 irqstack_early_init();
620 emergency_stack_init();
624 /* set up the bootmem stuff with available memory */
628 #ifdef CONFIG_DUMMY_CONSOLE
629 conswitchp
= &dummy_con
;
634 /* Use the default idle loop if the platform hasn't provided one. */
635 if (NULL
== ppc_md
.idle_loop
) {
636 ppc_md
.idle_loop
= default_idle
;
637 printk(KERN_INFO
"Using default idle loop\n");
641 ppc64_boot_msg(0x15, "Setup Done");
645 /* ToDo: do something useful if ppc_md is not yet setup. */
646 #define PPC64_LINUX_FUNCTION 0x0f000000
647 #define PPC64_IPL_MESSAGE 0xc0000000
648 #define PPC64_TERM_MESSAGE 0xb0000000
650 static void ppc64_do_msg(unsigned int src
, const char *msg
)
652 if (ppc_md
.progress
) {
655 sprintf(buf
, "%08X\n", src
);
656 ppc_md
.progress(buf
, 0);
657 snprintf(buf
, 128, "%s", msg
);
658 ppc_md
.progress(buf
, 0);
662 /* Print a boot progress message. */
663 void ppc64_boot_msg(unsigned int src
, const char *msg
)
665 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_IPL_MESSAGE
|src
, msg
);
666 printk("[boot]%04x %s\n", src
, msg
);
669 /* Print a termination message (print only -- does not stop the kernel) */
670 void ppc64_terminate_msg(unsigned int src
, const char *msg
)
672 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_TERM_MESSAGE
|src
, msg
);
673 printk("[terminate]%04x %s\n", src
, msg
);
676 int check_legacy_ioport(unsigned long base_port
)
678 if (ppc_md
.check_legacy_ioport
== NULL
)
680 return ppc_md
.check_legacy_ioport(base_port
);
682 EXPORT_SYMBOL(check_legacy_ioport
);