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>
42 #include <asm/machdep.h>
45 #include <asm/cputable.h>
46 #include <asm/sections.h>
47 #include <asm/btext.h>
48 #include <asm/nvram.h>
49 #include <asm/setup.h>
50 #include <asm/system.h>
52 #include <asm/iommu.h>
53 #include <asm/serial.h>
54 #include <asm/cache.h>
58 #include <asm/iseries/it_lp_naca.h>
59 #include <asm/firmware.h>
62 #include <asm/kexec.h>
67 #define DBG(fmt...) udbg_printf(fmt)
73 * Here are some early debugging facilities. You can enable one
74 * but your kernel will not boot on anything else if you do so
77 /* This one is for use on LPAR machines that support an HVC console
80 extern void udbg_init_debug_lpar(void);
81 /* This one is for use on Apple G5 machines
83 extern void udbg_init_pmac_realmode(void);
84 /* That's RTAS panel debug */
85 extern void call_rtas_display_status_delay(unsigned char c
);
86 /* Here's maple real mode debug */
87 extern void udbg_init_maple_realmode(void);
89 #define EARLY_DEBUG_INIT() do {} while(0)
92 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
93 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
94 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
95 #define EARLY_DEBUG_INIT() \
96 do { udbg_putc = call_rtas_display_status_delay; } while(0)
101 int boot_cpuid_phys
= 0;
105 /* Pick defaults since we might want to patch instructions
106 * before we've read this from the device tree.
108 struct ppc64_caches ppc64_caches
= {
114 EXPORT_SYMBOL_GPL(ppc64_caches
);
117 * These are used in binfmt_elf.c to put aux entries on the stack
118 * for each elf executable being started.
124 /* The main machine-dep calls structure
126 struct machdep_calls ppc_md
;
127 EXPORT_SYMBOL(ppc_md
);
129 #ifdef CONFIG_MAGIC_SYSRQ
130 unsigned long SYSRQ_KEY
;
131 #endif /* CONFIG_MAGIC_SYSRQ */
134 static int ppc64_panic_event(struct notifier_block
*, unsigned long, void *);
135 static struct notifier_block ppc64_panic_block
= {
136 .notifier_call
= ppc64_panic_event
,
137 .priority
= INT_MIN
/* may not return; must be done last */
142 static int smt_enabled_cmdline
;
144 /* Look for ibm,smt-enabled OF option */
145 static void check_smt_enabled(void)
147 struct device_node
*dn
;
150 /* Allow the command line to overrule the OF option */
151 if (smt_enabled_cmdline
)
154 dn
= of_find_node_by_path("/options");
157 smt_option
= (char *)get_property(dn
, "ibm,smt-enabled", NULL
);
160 if (!strcmp(smt_option
, "on"))
161 smt_enabled_at_boot
= 1;
162 else if (!strcmp(smt_option
, "off"))
163 smt_enabled_at_boot
= 0;
168 /* Look for smt-enabled= cmdline option */
169 static int __init
early_smt_enabled(char *p
)
171 smt_enabled_cmdline
= 1;
176 if (!strcmp(p
, "on") || !strcmp(p
, "1"))
177 smt_enabled_at_boot
= 1;
178 else if (!strcmp(p
, "off") || !strcmp(p
, "0"))
179 smt_enabled_at_boot
= 0;
183 early_param("smt-enabled", early_smt_enabled
);
186 #define check_smt_enabled()
187 #endif /* CONFIG_SMP */
189 extern struct machdep_calls pSeries_md
;
190 extern struct machdep_calls pmac_md
;
191 extern struct machdep_calls maple_md
;
192 extern struct machdep_calls cell_md
;
193 extern struct machdep_calls iseries_md
;
195 /* Ultimately, stuff them in an elf section like initcalls... */
196 static struct machdep_calls __initdata
*machines
[] = {
197 #ifdef CONFIG_PPC_PSERIES
199 #endif /* CONFIG_PPC_PSERIES */
200 #ifdef CONFIG_PPC_PMAC
202 #endif /* CONFIG_PPC_PMAC */
203 #ifdef CONFIG_PPC_MAPLE
205 #endif /* CONFIG_PPC_MAPLE */
206 #ifdef CONFIG_PPC_CELL
209 #ifdef CONFIG_PPC_ISERIES
216 * Early initialization entry point. This is called by head.S
217 * with MMU translation disabled. We rely on the "feature" of
218 * the CPU that ignores the top 2 bits of the address in real
219 * mode so we can access kernel globals normally provided we
220 * only toy with things in the RMO region. From here, we do
221 * some early parsing of the device-tree to setup out LMB
222 * data structures, and allocate & initialize the hash table
223 * and segment tables so we can start running with translation
226 * It is this function which will call the probe() callback of
227 * the various platform types and copy the matching one to the
228 * global ppc_md structure. Your platform can eventually do
229 * some very early initializations from the probe() routine, but
230 * this is not recommended, be very careful as, for example, the
231 * device-tree is not accessible via normal means at this point.
234 void __init
early_setup(unsigned long dt_ptr
)
236 struct paca_struct
*lpaca
= get_paca();
237 static struct machdep_calls
**mach
;
240 * Enable early debugging if any specified (see top of
245 DBG(" -> early_setup()\n");
248 * Do early initializations using the flattened device
249 * tree, like retreiving the physical memory map or
250 * calculating/retreiving the hash table size
252 early_init_devtree(__va(dt_ptr
));
255 * Iterate all ppc_md structures until we find the proper
256 * one for the current machine type
258 DBG("Probing machine type for platform %x...\n", _machine
);
260 for (mach
= machines
; *mach
; mach
++) {
261 if ((*mach
)->probe(_machine
))
264 /* What can we do if we didn't find ? */
266 DBG("No suitable machine found !\n");
271 DBG("Found, Initializing memory management...\n");
274 * Initialize the MMU Hash table and create the linear mapping
275 * of memory. Has to be done before stab/slb initialization as
276 * this is currently where the page size encoding is obtained
281 * Initialize stab / SLB management except on iSeries
283 if (!firmware_has_feature(FW_FEATURE_ISERIES
)) {
284 if (cpu_has_feature(CPU_FTR_SLB
))
287 stab_initialize(lpaca
->stab_real
);
290 DBG(" <- early_setup()\n");
294 void early_setup_secondary(void)
296 struct paca_struct
*lpaca
= get_paca();
298 /* Mark enabled in PACA */
299 lpaca
->proc_enabled
= 0;
301 /* Initialize hash table for that CPU */
302 htab_initialize_secondary();
304 /* Initialize STAB/SLB. We use a virtual address as it works
305 * in real mode on pSeries and we want a virutal address on
308 if (cpu_has_feature(CPU_FTR_SLB
))
311 stab_initialize(lpaca
->stab_addr
);
314 #endif /* CONFIG_SMP */
316 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
317 void smp_release_cpus(void)
319 extern unsigned long __secondary_hold_spinloop
;
321 DBG(" -> smp_release_cpus()\n");
323 /* All secondary cpus are spinning on a common spinloop, release them
324 * all now so they can start to spin on their individual paca
325 * spinloops. For non SMP kernels, the secondary cpus never get out
326 * of the common spinloop.
327 * This is useless but harmless on iSeries, secondaries are already
328 * waiting on their paca spinloops. */
330 __secondary_hold_spinloop
= 1;
333 DBG(" <- smp_release_cpus()\n");
336 #define smp_release_cpus()
337 #endif /* CONFIG_SMP || CONFIG_KEXEC */
340 * Initialize some remaining members of the ppc64_caches and systemcfg
342 * (at least until we get rid of them completely). This is mostly some
343 * cache informations about the CPU that will be used by cache flush
344 * routines and/or provided to userland
346 static void __init
initialize_cache_info(void)
348 struct device_node
*np
;
349 unsigned long num_cpus
= 0;
351 DBG(" -> initialize_cache_info()\n");
353 for (np
= NULL
; (np
= of_find_node_by_type(np
, "cpu"));) {
356 /* We're assuming *all* of the CPUs have the same
357 * d-cache and i-cache sizes... -Peter
360 if ( num_cpus
== 1 ) {
365 /* Then read cache informations */
366 if (_machine
== PLATFORM_POWERMAC
) {
367 dc
= "d-cache-block-size";
368 ic
= "i-cache-block-size";
370 dc
= "d-cache-line-size";
371 ic
= "i-cache-line-size";
375 lsize
= cur_cpu_spec
->dcache_bsize
;
376 sizep
= (u32
*)get_property(np
, "d-cache-size", NULL
);
379 lsizep
= (u32
*) get_property(np
, dc
, NULL
);
382 if (sizep
== 0 || lsizep
== 0)
383 DBG("Argh, can't find dcache properties ! "
384 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
386 ppc64_caches
.dsize
= size
;
387 ppc64_caches
.dline_size
= lsize
;
388 ppc64_caches
.log_dline_size
= __ilog2(lsize
);
389 ppc64_caches
.dlines_per_page
= PAGE_SIZE
/ lsize
;
392 lsize
= cur_cpu_spec
->icache_bsize
;
393 sizep
= (u32
*)get_property(np
, "i-cache-size", NULL
);
396 lsizep
= (u32
*)get_property(np
, ic
, NULL
);
399 if (sizep
== 0 || lsizep
== 0)
400 DBG("Argh, can't find icache properties ! "
401 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
403 ppc64_caches
.isize
= size
;
404 ppc64_caches
.iline_size
= lsize
;
405 ppc64_caches
.log_iline_size
= __ilog2(lsize
);
406 ppc64_caches
.ilines_per_page
= PAGE_SIZE
/ lsize
;
410 DBG(" <- initialize_cache_info()\n");
415 * Do some initial setup of the system. The parameters are those which
416 * were passed in from the bootloader.
418 void __init
setup_system(void)
420 DBG(" -> setup_system()\n");
423 * Unflatten the device-tree passed by prom_init or kexec
425 unflatten_device_tree();
428 kexec_setup(); /* requires unflattened device tree. */
432 * Fill the ppc64_caches & systemcfg structures with informations
433 * retreived from the device-tree. Need to be called before
434 * finish_device_tree() since the later requires some of the
435 * informations filled up here to properly parse the interrupt
437 * It also sets up the cache line sizes which allows to call
438 * routines like flush_icache_range (used by the hash init
441 initialize_cache_info();
443 #ifdef CONFIG_PPC_RTAS
445 * Initialize RTAS if available
448 #endif /* CONFIG_PPC_RTAS */
451 * Check if we have an initrd provided via the device-tree
456 * Do some platform specific early initializations, that includes
457 * setting up the hash table pointers. It also sets up some interrupt-mapping
458 * related options that will be used by finish_device_tree()
463 * We can discover serial ports now since the above did setup the
464 * hash table management for us, thus ioremap works. We do that early
465 * so that further code can be debugged
467 #ifdef CONFIG_PPC_MULTIPLATFORM
468 find_legacy_serial_ports();
472 * "Finish" the device-tree, that is do the actual parsing of
473 * some of the properties like the interrupt map
475 finish_device_tree();
477 #ifdef CONFIG_BOOTX_TEXT
484 #ifdef CONFIG_XMON_DEFAULT
488 * Register early console
490 register_early_udbg_console();
492 /* Save unparsed command line copy for /proc/cmdline */
493 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
498 smp_setup_cpu_maps();
500 /* Release secondary cpus out of their spinloops at 0x60 now that
501 * we can map physical -> logical CPU ids
505 printk("Starting Linux PPC64 %s\n", system_utsname
.version
);
507 printk("-----------------------------------------------------\n");
508 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size
);
509 printk("ppc64_interrupt_controller = 0x%ld\n",
510 ppc64_interrupt_controller
);
511 printk("platform = 0x%x\n", _machine
);
512 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
513 printk("ppc64_caches.dcache_line_size = 0x%x\n",
514 ppc64_caches
.dline_size
);
515 printk("ppc64_caches.icache_line_size = 0x%x\n",
516 ppc64_caches
.iline_size
);
517 printk("htab_address = 0x%p\n", htab_address
);
518 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
519 printk("-----------------------------------------------------\n");
523 DBG(" <- setup_system()\n");
526 static int ppc64_panic_event(struct notifier_block
*this,
527 unsigned long event
, void *ptr
)
529 ppc_md
.panic((char *)ptr
); /* May not return */
533 #ifdef CONFIG_IRQSTACKS
534 static void __init
irqstack_early_init(void)
539 * interrupt stacks must be under 256MB, we cannot afford to take
540 * SLB misses on them.
543 softirq_ctx
[i
] = (struct thread_info
*)
544 __va(lmb_alloc_base(THREAD_SIZE
,
545 THREAD_SIZE
, 0x10000000));
546 hardirq_ctx
[i
] = (struct thread_info
*)
547 __va(lmb_alloc_base(THREAD_SIZE
,
548 THREAD_SIZE
, 0x10000000));
552 #define irqstack_early_init()
556 * Stack space used when we detect a bad kernel stack pointer, and
557 * early in SMP boots before relocation is enabled.
559 static void __init
emergency_stack_init(void)
565 * Emergency stacks must be under 256MB, we cannot afford to take
566 * SLB misses on them. The ABI also requires them to be 128-byte
569 * Since we use these as temporary stacks during secondary CPU
570 * bringup, we need to get at them in real mode. This means they
571 * must also be within the RMO region.
573 limit
= min(0x10000000UL
, lmb
.rmo_size
);
576 paca
[i
].emergency_sp
=
577 __va(lmb_alloc_base(HW_PAGE_SIZE
, 128, limit
)) + HW_PAGE_SIZE
;
581 * Called into from start_kernel, after lock_kernel has been called.
582 * Initializes bootmem, which is unsed to manage page allocation until
583 * mem_init is called.
585 void __init
setup_arch(char **cmdline_p
)
587 extern void do_init_bootmem(void);
589 ppc64_boot_msg(0x12, "Setup Arch");
591 *cmdline_p
= cmd_line
;
594 * Set cache line size based on type of cpu as a default.
595 * Systems with OF can look in the properties on the cpu node(s)
596 * for a possibly more accurate value.
598 dcache_bsize
= ppc64_caches
.dline_size
;
599 icache_bsize
= ppc64_caches
.iline_size
;
601 /* reboot on panic */
605 notifier_chain_register(&panic_notifier_list
, &ppc64_panic_block
);
607 init_mm
.start_code
= PAGE_OFFSET
;
608 init_mm
.end_code
= (unsigned long) _etext
;
609 init_mm
.end_data
= (unsigned long) _edata
;
610 init_mm
.brk
= klimit
;
612 irqstack_early_init();
613 emergency_stack_init();
617 /* set up the bootmem stuff with available memory */
621 #ifdef CONFIG_DUMMY_CONSOLE
622 conswitchp
= &dummy_con
;
627 /* Use the default idle loop if the platform hasn't provided one. */
628 if (NULL
== ppc_md
.idle_loop
) {
629 ppc_md
.idle_loop
= default_idle
;
630 printk(KERN_INFO
"Using default idle loop\n");
634 ppc64_boot_msg(0x15, "Setup Done");
638 /* ToDo: do something useful if ppc_md is not yet setup. */
639 #define PPC64_LINUX_FUNCTION 0x0f000000
640 #define PPC64_IPL_MESSAGE 0xc0000000
641 #define PPC64_TERM_MESSAGE 0xb0000000
643 static void ppc64_do_msg(unsigned int src
, const char *msg
)
645 if (ppc_md
.progress
) {
648 sprintf(buf
, "%08X\n", src
);
649 ppc_md
.progress(buf
, 0);
650 snprintf(buf
, 128, "%s", msg
);
651 ppc_md
.progress(buf
, 0);
655 /* Print a boot progress message. */
656 void ppc64_boot_msg(unsigned int src
, const char *msg
)
658 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_IPL_MESSAGE
|src
, msg
);
659 printk("[boot]%04x %s\n", src
, msg
);
662 /* Print a termination message (print only -- does not stop the kernel) */
663 void ppc64_terminate_msg(unsigned int src
, const char *msg
)
665 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_TERM_MESSAGE
|src
, msg
);
666 printk("[terminate]%04x %s\n", src
, msg
);
669 int check_legacy_ioport(unsigned long base_port
)
671 if (ppc_md
.check_legacy_ioport
== NULL
)
673 return ppc_md
.check_legacy_ioport(base_port
);
675 EXPORT_SYMBOL(check_legacy_ioport
);