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>
40 #include <asm/bootinfo.h>
43 #include <asm/machdep.h>
45 #include <asm/ppcdebug.h>
47 #include <asm/cputable.h>
48 #include <asm/sections.h>
49 #include <asm/btext.h>
50 #include <asm/nvram.h>
51 #include <asm/setup.h>
52 #include <asm/system.h>
54 #include <asm/iommu.h>
55 #include <asm/serial.h>
56 #include <asm/cache.h>
60 #include <asm/iSeries/ItLpNaca.h>
61 #include <asm/firmware.h>
64 #define DBG(fmt...) udbg_printf(fmt)
70 * Here are some early debugging facilities. You can enable one
71 * but your kernel will not boot on anything else if you do so
74 /* This one is for use on LPAR machines that support an HVC console
77 extern void udbg_init_debug_lpar(void);
78 /* This one is for use on Apple G5 machines
80 extern void udbg_init_pmac_realmode(void);
81 /* That's RTAS panel debug */
82 extern void call_rtas_display_status_delay(unsigned char c
);
83 /* Here's maple real mode debug */
84 extern void udbg_init_maple_realmode(void);
86 #define EARLY_DEBUG_INIT() do {} while(0)
89 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
90 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
91 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
92 #define EARLY_DEBUG_INIT() \
93 do { udbg_putc = call_rtas_display_status_delay; } while(0)
96 /* extern void *stab; */
97 extern unsigned long klimit
;
99 extern void mm_init_ppc64(void);
100 extern void stab_initialize(unsigned long stab
);
101 extern void htab_initialize(void);
102 extern void early_init_devtree(void *flat_dt
);
103 extern void unflatten_device_tree(void);
105 extern void smp_release_cpus(void);
109 int boot_cpuid_phys
= 0;
113 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 */
141 * Perhaps we can put the pmac screen_info[] here
142 * on pmac as well so we don't need the ifdef's.
143 * Until we get multiple-console support in here
145 * Maybe tie it to serial consoles, since this is really what
146 * these processors use on existing boards. -- Dan
148 struct screen_info screen_info
= {
151 .orig_video_cols
= 80,
152 .orig_video_lines
= 25,
153 .orig_video_isVGA
= 1,
154 .orig_video_points
= 16
159 static int smt_enabled_cmdline
;
161 /* Look for ibm,smt-enabled OF option */
162 static void check_smt_enabled(void)
164 struct device_node
*dn
;
167 /* Allow the command line to overrule the OF option */
168 if (smt_enabled_cmdline
)
171 dn
= of_find_node_by_path("/options");
174 smt_option
= (char *)get_property(dn
, "ibm,smt-enabled", NULL
);
177 if (!strcmp(smt_option
, "on"))
178 smt_enabled_at_boot
= 1;
179 else if (!strcmp(smt_option
, "off"))
180 smt_enabled_at_boot
= 0;
185 /* Look for smt-enabled= cmdline option */
186 static int __init
early_smt_enabled(char *p
)
188 smt_enabled_cmdline
= 1;
193 if (!strcmp(p
, "on") || !strcmp(p
, "1"))
194 smt_enabled_at_boot
= 1;
195 else if (!strcmp(p
, "off") || !strcmp(p
, "0"))
196 smt_enabled_at_boot
= 0;
200 early_param("smt-enabled", early_smt_enabled
);
203 * setup_cpu_maps - initialize the following cpu maps:
208 * Having the possible map set up early allows us to restrict allocations
209 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
211 * We do not initialize the online map here; cpus set their own bits in
212 * cpu_online_map as they come up.
214 * This function is valid only for Open Firmware systems. finish_device_tree
215 * must be called before using this.
217 * While we're here, we may as well set the "physical" cpu ids in the paca.
219 static void __init
setup_cpu_maps(void)
221 struct device_node
*dn
= NULL
;
227 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< NR_CPUS
) {
229 int j
, len
= sizeof(u32
), nthreads
;
231 intserv
= (u32
*)get_property(dn
, "ibm,ppc-interrupt-server#s",
234 intserv
= (u32
*)get_property(dn
, "reg", NULL
);
236 nthreads
= len
/ sizeof(u32
);
238 for (j
= 0; j
< nthreads
&& cpu
< NR_CPUS
; j
++) {
239 cpu_set(cpu
, cpu_present_map
);
240 set_hard_smp_processor_id(cpu
, intserv
[j
]);
242 if (intserv
[j
] == boot_cpuid_phys
)
244 cpu_set(cpu
, cpu_possible_map
);
249 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
250 * boot cpu is logical 0.
252 if (boot_cpuid_phys
!= get_hard_smp_processor_id(0)) {
254 tmp
= get_hard_smp_processor_id(0);
255 set_hard_smp_processor_id(0, boot_cpuid_phys
);
256 set_hard_smp_processor_id(swap_cpuid
, tmp
);
260 * On pSeries LPAR, we need to know how many cpus
261 * could possibly be added to this partition.
263 if (systemcfg
->platform
== PLATFORM_PSERIES_LPAR
&&
264 (dn
= of_find_node_by_path("/rtas"))) {
265 int num_addr_cell
, num_size_cell
, maxcpus
;
268 num_addr_cell
= prom_n_addr_cells(dn
);
269 num_size_cell
= prom_n_size_cells(dn
);
271 ireg
= (unsigned int *)
272 get_property(dn
, "ibm,lrdr-capacity", NULL
);
277 maxcpus
= ireg
[num_addr_cell
+ num_size_cell
];
279 /* Double maxcpus for processors which have SMT capability */
280 if (cpu_has_feature(CPU_FTR_SMT
))
283 if (maxcpus
> NR_CPUS
) {
285 "Partition configured for %d cpus, "
286 "operating system maximum is %d.\n",
290 printk(KERN_INFO
"Partition configured for %d cpus.\n",
293 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
294 cpu_set(cpu
, cpu_possible_map
);
300 * Do the sibling map; assume only two threads per processor.
303 cpu_set(cpu
, cpu_sibling_map
[cpu
]);
304 if (cpu_has_feature(CPU_FTR_SMT
))
305 cpu_set(cpu
^ 0x1, cpu_sibling_map
[cpu
]);
308 systemcfg
->processorCount
= num_present_cpus();
310 #endif /* CONFIG_SMP */
312 extern struct machdep_calls pSeries_md
;
313 extern struct machdep_calls pmac_md
;
314 extern struct machdep_calls maple_md
;
315 extern struct machdep_calls bpa_md
;
316 extern struct machdep_calls iseries_md
;
318 /* Ultimately, stuff them in an elf section like initcalls... */
319 static struct machdep_calls __initdata
*machines
[] = {
320 #ifdef CONFIG_PPC_PSERIES
322 #endif /* CONFIG_PPC_PSERIES */
323 #ifdef CONFIG_PPC_PMAC
325 #endif /* CONFIG_PPC_PMAC */
326 #ifdef CONFIG_PPC_MAPLE
328 #endif /* CONFIG_PPC_MAPLE */
329 #ifdef CONFIG_PPC_BPA
332 #ifdef CONFIG_PPC_ISERIES
339 * Early initialization entry point. This is called by head.S
340 * with MMU translation disabled. We rely on the "feature" of
341 * the CPU that ignores the top 2 bits of the address in real
342 * mode so we can access kernel globals normally provided we
343 * only toy with things in the RMO region. From here, we do
344 * some early parsing of the device-tree to setup out LMB
345 * data structures, and allocate & initialize the hash table
346 * and segment tables so we can start running with translation
349 * It is this function which will call the probe() callback of
350 * the various platform types and copy the matching one to the
351 * global ppc_md structure. Your platform can eventually do
352 * some very early initializations from the probe() routine, but
353 * this is not recommended, be very careful as, for example, the
354 * device-tree is not accessible via normal means at this point.
357 void __init
early_setup(unsigned long dt_ptr
)
359 struct paca_struct
*lpaca
= get_paca();
360 static struct machdep_calls
**mach
;
363 * Enable early debugging if any specified (see top of
368 DBG(" -> early_setup()\n");
371 * Fill the default DBG level (do we want to keep
372 * that old mecanism around forever ?)
377 * Do early initializations using the flattened device
378 * tree, like retreiving the physical memory map or
379 * calculating/retreiving the hash table size
381 early_init_devtree(__va(dt_ptr
));
384 * Iterate all ppc_md structures until we find the proper
385 * one for the current machine type
387 DBG("Probing machine type for platform %x...\n",
388 systemcfg
->platform
);
390 for (mach
= machines
; *mach
; mach
++) {
391 if ((*mach
)->probe(systemcfg
->platform
))
394 /* What can we do if we didn't find ? */
396 DBG("No suitable machine found !\n");
401 DBG("Found, Initializing memory management...\n");
404 * Initialize stab / SLB management
406 if (!firmware_has_feature(FW_FEATURE_ISERIES
))
407 stab_initialize(lpaca
->stab_real
);
410 * Initialize the MMU Hash table and create the linear mapping
415 DBG(" <- early_setup()\n");
420 * Initialize some remaining members of the ppc64_caches and systemcfg structures
421 * (at least until we get rid of them completely). This is mostly some
422 * cache informations about the CPU that will be used by cache flush
423 * routines and/or provided to userland
425 static void __init
initialize_cache_info(void)
427 struct device_node
*np
;
428 unsigned long num_cpus
= 0;
430 DBG(" -> initialize_cache_info()\n");
432 for (np
= NULL
; (np
= of_find_node_by_type(np
, "cpu"));) {
435 /* We're assuming *all* of the CPUs have the same
436 * d-cache and i-cache sizes... -Peter
439 if ( num_cpus
== 1 ) {
444 /* Then read cache informations */
445 if (systemcfg
->platform
== PLATFORM_POWERMAC
) {
446 dc
= "d-cache-block-size";
447 ic
= "i-cache-block-size";
449 dc
= "d-cache-line-size";
450 ic
= "i-cache-line-size";
454 lsize
= cur_cpu_spec
->dcache_bsize
;
455 sizep
= (u32
*)get_property(np
, "d-cache-size", NULL
);
458 lsizep
= (u32
*) get_property(np
, dc
, NULL
);
461 if (sizep
== 0 || lsizep
== 0)
462 DBG("Argh, can't find dcache properties ! "
463 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
465 systemcfg
->dcache_size
= ppc64_caches
.dsize
= size
;
466 systemcfg
->dcache_line_size
=
467 ppc64_caches
.dline_size
= lsize
;
468 ppc64_caches
.log_dline_size
= __ilog2(lsize
);
469 ppc64_caches
.dlines_per_page
= PAGE_SIZE
/ lsize
;
472 lsize
= cur_cpu_spec
->icache_bsize
;
473 sizep
= (u32
*)get_property(np
, "i-cache-size", NULL
);
476 lsizep
= (u32
*)get_property(np
, ic
, NULL
);
479 if (sizep
== 0 || lsizep
== 0)
480 DBG("Argh, can't find icache properties ! "
481 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
483 systemcfg
->icache_size
= ppc64_caches
.isize
= size
;
484 systemcfg
->icache_line_size
=
485 ppc64_caches
.iline_size
= lsize
;
486 ppc64_caches
.log_iline_size
= __ilog2(lsize
);
487 ppc64_caches
.ilines_per_page
= PAGE_SIZE
/ lsize
;
491 /* Add an eye catcher and the systemcfg layout version number */
492 strcpy(systemcfg
->eye_catcher
, "SYSTEMCFG:PPC64");
493 systemcfg
->version
.major
= SYSTEMCFG_MAJOR
;
494 systemcfg
->version
.minor
= SYSTEMCFG_MINOR
;
495 systemcfg
->processor
= mfspr(SPRN_PVR
);
497 DBG(" <- initialize_cache_info()\n");
500 static void __init
check_for_initrd(void)
502 #ifdef CONFIG_BLK_DEV_INITRD
505 DBG(" -> check_for_initrd()\n");
508 prop
= (u64
*)get_property(of_chosen
,
509 "linux,initrd-start", NULL
);
511 initrd_start
= (unsigned long)__va(*prop
);
512 prop
= (u64
*)get_property(of_chosen
,
513 "linux,initrd-end", NULL
);
515 initrd_end
= (unsigned long)__va(*prop
);
516 initrd_below_start_ok
= 1;
522 /* If we were passed an initrd, set the ROOT_DEV properly if the values
523 * look sensible. If not, clear initrd reference.
525 if (initrd_start
>= KERNELBASE
&& initrd_end
>= KERNELBASE
&&
526 initrd_end
> initrd_start
)
527 ROOT_DEV
= Root_RAM0
;
529 initrd_start
= initrd_end
= 0;
532 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
534 DBG(" <- check_for_initrd()\n");
535 #endif /* CONFIG_BLK_DEV_INITRD */
539 * Do some initial setup of the system. The parameters are those which
540 * were passed in from the bootloader.
542 void __init
setup_system(void)
544 DBG(" -> setup_system()\n");
546 #ifdef CONFIG_PPC_ISERIES
547 /* pSeries systems are identified in prom.c via OF. */
548 if (itLpNaca
.xLparInstalled
== 1)
549 systemcfg
->platform
= PLATFORM_ISERIES_LPAR
;
552 #else /* CONFIG_PPC_ISERIES */
555 * Unflatten the device-tree passed by prom_init or kexec
557 unflatten_device_tree();
560 * Fill the ppc64_caches & systemcfg structures with informations
561 * retreived from the device-tree. Need to be called before
562 * finish_device_tree() since the later requires some of the
563 * informations filled up here to properly parse the interrupt
565 * It also sets up the cache line sizes which allows to call
566 * routines like flush_icache_range (used by the hash init
569 initialize_cache_info();
571 #ifdef CONFIG_PPC_RTAS
573 * Initialize RTAS if available
576 #endif /* CONFIG_PPC_RTAS */
579 * Check if we have an initrd provided via the device-tree
584 * Do some platform specific early initializations, that includes
585 * setting up the hash table pointers. It also sets up some interrupt-mapping
586 * related options that will be used by finish_device_tree()
591 * "Finish" the device-tree, that is do the actual parsing of
592 * some of the properties like the interrupt map
594 finish_device_tree();
599 #ifdef CONFIG_XMON_DEFAULT
603 * Register early console
605 register_early_udbg_console();
607 /* Save unparsed command line copy for /proc/cmdline */
608 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
611 #endif /* !CONFIG_PPC_ISERIES */
615 * iSeries has already initialized the cpu maps at this point.
619 /* Release secondary cpus out of their spinloops at 0x60 now that
620 * we can map physical -> logical CPU ids
625 printk("Starting Linux PPC64 %s\n", system_utsname
.version
);
627 printk("-----------------------------------------------------\n");
628 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size
);
629 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch
);
630 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller
);
631 printk("systemcfg = 0x%p\n", systemcfg
);
632 printk("systemcfg->platform = 0x%x\n", systemcfg
->platform
);
633 printk("systemcfg->processorCount = 0x%lx\n", systemcfg
->processorCount
);
634 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg
->physicalMemorySize
);
635 printk("ppc64_caches.dcache_line_size = 0x%x\n",
636 ppc64_caches
.dline_size
);
637 printk("ppc64_caches.icache_line_size = 0x%x\n",
638 ppc64_caches
.iline_size
);
639 printk("htab_address = 0x%p\n", htab_address
);
640 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
641 printk("-----------------------------------------------------\n");
645 DBG(" <- setup_system()\n");
648 /* also used by kexec */
649 void machine_shutdown(void)
651 if (ppc_md
.nvram_sync
)
655 void machine_restart(char *cmd
)
662 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
667 void machine_power_off(void)
674 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
678 /* Used by the G5 thermal driver */
679 EXPORT_SYMBOL_GPL(machine_power_off
);
681 void machine_halt(void)
688 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
693 static int ppc64_panic_event(struct notifier_block
*this,
694 unsigned long event
, void *ptr
)
696 ppc_md
.panic((char *)ptr
); /* May not return */
702 DEFINE_PER_CPU(unsigned int, pvr
);
705 static int show_cpuinfo(struct seq_file
*m
, void *v
)
707 unsigned long cpu_id
= (unsigned long)v
- 1;
712 if (cpu_id
== NR_CPUS
) {
713 seq_printf(m
, "timebase\t: %lu\n", ppc_tb_freq
);
715 if (ppc_md
.get_cpuinfo
!= NULL
)
716 ppc_md
.get_cpuinfo(m
);
721 /* We only show online cpus: disable preempt (overzealous, I
722 * knew) to prevent cpu going down. */
724 if (!cpu_online(cpu_id
)) {
730 pvr
= per_cpu(pvr
, cpu_id
);
732 pvr
= mfspr(SPRN_PVR
);
734 maj
= (pvr
>> 8) & 0xFF;
737 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
738 seq_printf(m
, "cpu\t\t: ");
740 if (cur_cpu_spec
->pvr_mask
)
741 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
743 seq_printf(m
, "unknown (%08x)", pvr
);
745 #ifdef CONFIG_ALTIVEC
746 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
747 seq_printf(m
, ", altivec supported");
748 #endif /* CONFIG_ALTIVEC */
753 * Assume here that all clock rates are the same in a
754 * smp system. -- Cort
756 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq
/ 1000000,
757 ppc_proc_freq
% 1000000);
759 seq_printf(m
, "revision\t: %hd.%hd\n\n", maj
, min
);
765 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
767 return *pos
<= NR_CPUS
? (void *)((*pos
)+1) : NULL
;
769 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
772 return c_start(m
, pos
);
774 static void c_stop(struct seq_file
*m
, void *v
)
777 struct seq_operations cpuinfo_op
= {
781 .show
= show_cpuinfo
,
785 * These three variables are used to save values passed to us by prom_init()
786 * via the device tree. The TCE variables are needed because with a memory_limit
787 * in force we may need to explicitly map the TCE are at the top of RAM.
789 unsigned long memory_limit
;
790 unsigned long tce_alloc_start
;
791 unsigned long tce_alloc_end
;
793 #ifdef CONFIG_PPC_ISERIES
795 * On iSeries we just parse the mem=X option from the command line.
796 * On pSeries it's a bit more complicated, see prom_init_mem()
798 static int __init
early_parsemem(char *p
)
803 memory_limit
= ALIGN(memparse(p
, &p
), PAGE_SIZE
);
807 early_param("mem", early_parsemem
);
808 #endif /* CONFIG_PPC_ISERIES */
810 #ifdef CONFIG_PPC_MULTIPLATFORM
811 static int __init
set_preferred_console(void)
813 struct device_node
*prom_stdout
= NULL
;
818 DBG(" -> set_preferred_console()\n");
820 /* The user has requested a console so this is already set up. */
821 if (strstr(saved_command_line
, "console=")) {
822 DBG(" console was specified !\n");
827 DBG(" of_chosen is NULL !\n");
830 /* We are getting a weird phandle from OF ... */
831 /* ... So use the full path instead */
832 name
= (char *)get_property(of_chosen
, "linux,stdout-path", NULL
);
834 DBG(" no linux,stdout-path !\n");
837 prom_stdout
= of_find_node_by_path(name
);
839 DBG(" can't find stdout package %s !\n", name
);
842 DBG("stdout is %s\n", prom_stdout
->full_name
);
844 name
= (char *)get_property(prom_stdout
, "name", NULL
);
846 DBG(" stdout package has no name !\n");
849 spd
= (u32
*)get_property(prom_stdout
, "current-speed", NULL
);
853 #ifdef CONFIG_SERIAL_8250_CONSOLE
854 else if (strcmp(name
, "serial") == 0) {
856 u32
*reg
= (u32
*)get_property(prom_stdout
, "reg", &i
);
872 /* We dont recognise the serial port */
877 #endif /* CONFIG_SERIAL_8250_CONSOLE */
878 #ifdef CONFIG_PPC_PSERIES
879 else if (strcmp(name
, "vty") == 0) {
880 u32
*reg
= (u32
*)get_property(prom_stdout
, "reg", NULL
);
881 char *compat
= (char *)get_property(prom_stdout
, "compatible", NULL
);
883 if (reg
&& compat
&& (strcmp(compat
, "hvterm-protocol") == 0)) {
884 /* Host Virtual Serial Interface */
896 of_node_put(prom_stdout
);
897 DBG("Found hvsi console at offset %d\n", offset
);
898 return add_preferred_console("hvsi", offset
, NULL
);
900 /* pSeries LPAR virtual console */
901 of_node_put(prom_stdout
);
902 DBG("Found hvc console\n");
903 return add_preferred_console("hvc", 0, NULL
);
906 #endif /* CONFIG_PPC_PSERIES */
907 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
908 else if (strcmp(name
, "ch-a") == 0)
910 else if (strcmp(name
, "ch-b") == 0)
912 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
915 of_node_put(prom_stdout
);
917 DBG("Found serial console at ttyS%d\n", offset
);
920 static char __initdata opt
[16];
921 sprintf(opt
, "%d", *spd
);
922 return add_preferred_console("ttyS", offset
, opt
);
924 return add_preferred_console("ttyS", offset
, NULL
);
927 DBG("No preferred console found !\n");
928 of_node_put(prom_stdout
);
931 console_initcall(set_preferred_console
);
932 #endif /* CONFIG_PPC_MULTIPLATFORM */
934 #ifdef CONFIG_IRQSTACKS
935 static void __init
irqstack_early_init(void)
940 * interrupt stacks must be under 256MB, we cannot afford to take
941 * SLB misses on them.
944 softirq_ctx
[i
] = (struct thread_info
*)__va(lmb_alloc_base(THREAD_SIZE
,
945 THREAD_SIZE
, 0x10000000));
946 hardirq_ctx
[i
] = (struct thread_info
*)__va(lmb_alloc_base(THREAD_SIZE
,
947 THREAD_SIZE
, 0x10000000));
951 #define irqstack_early_init()
955 * Stack space used when we detect a bad kernel stack pointer, and
956 * early in SMP boots before relocation is enabled.
958 static void __init
emergency_stack_init(void)
964 * Emergency stacks must be under 256MB, we cannot afford to take
965 * SLB misses on them. The ABI also requires them to be 128-byte
968 * Since we use these as temporary stacks during secondary CPU
969 * bringup, we need to get at them in real mode. This means they
970 * must also be within the RMO region.
972 limit
= min(0x10000000UL
, lmb
.rmo_size
);
975 paca
[i
].emergency_sp
= __va(lmb_alloc_base(PAGE_SIZE
, 128,
980 * Called from setup_arch to initialize the bitmap of available
981 * syscalls in the systemcfg page
983 void __init
setup_syscall_map(void)
985 unsigned int i
, count64
= 0, count32
= 0;
986 extern unsigned long *sys_call_table
;
987 extern unsigned long *sys_call_table32
;
988 extern unsigned long sys_ni_syscall
;
991 for (i
= 0; i
< __NR_syscalls
; i
++) {
992 if (sys_call_table
[i
] == sys_ni_syscall
)
995 systemcfg
->syscall_map_64
[i
>> 5] |= 0x80000000UL
>> (i
& 0x1f);
997 for (i
= 0; i
< __NR_syscalls
; i
++) {
998 if (sys_call_table32
[i
] == sys_ni_syscall
)
1001 systemcfg
->syscall_map_32
[i
>> 5] |= 0x80000000UL
>> (i
& 0x1f);
1003 printk(KERN_INFO
"Syscall map setup, %d 32 bits and %d 64 bits syscalls\n",
1008 * Called into from start_kernel, after lock_kernel has been called.
1009 * Initializes bootmem, which is unsed to manage page allocation until
1010 * mem_init is called.
1012 void __init
setup_arch(char **cmdline_p
)
1014 extern void do_init_bootmem(void);
1016 ppc64_boot_msg(0x12, "Setup Arch");
1018 *cmdline_p
= cmd_line
;
1021 * Set cache line size based on type of cpu as a default.
1022 * Systems with OF can look in the properties on the cpu node(s)
1023 * for a possibly more accurate value.
1025 dcache_bsize
= ppc64_caches
.dline_size
;
1026 icache_bsize
= ppc64_caches
.iline_size
;
1028 /* reboot on panic */
1029 panic_timeout
= 180;
1032 notifier_chain_register(&panic_notifier_list
, &ppc64_panic_block
);
1034 init_mm
.start_code
= PAGE_OFFSET
;
1035 init_mm
.end_code
= (unsigned long) _etext
;
1036 init_mm
.end_data
= (unsigned long) _edata
;
1037 init_mm
.brk
= klimit
;
1039 irqstack_early_init();
1040 emergency_stack_init();
1044 /* set up the bootmem stuff with available memory */
1048 /* initialize the syscall map in systemcfg */
1049 setup_syscall_map();
1051 ppc_md
.setup_arch();
1053 /* Use the default idle loop if the platform hasn't provided one. */
1054 if (NULL
== ppc_md
.idle_loop
) {
1055 ppc_md
.idle_loop
= default_idle
;
1056 printk(KERN_INFO
"Using default idle loop\n");
1060 ppc64_boot_msg(0x15, "Setup Done");
1064 /* ToDo: do something useful if ppc_md is not yet setup. */
1065 #define PPC64_LINUX_FUNCTION 0x0f000000
1066 #define PPC64_IPL_MESSAGE 0xc0000000
1067 #define PPC64_TERM_MESSAGE 0xb0000000
1069 static void ppc64_do_msg(unsigned int src
, const char *msg
)
1071 if (ppc_md
.progress
) {
1074 sprintf(buf
, "%08X\n", src
);
1075 ppc_md
.progress(buf
, 0);
1076 snprintf(buf
, 128, "%s", msg
);
1077 ppc_md
.progress(buf
, 0);
1081 /* Print a boot progress message. */
1082 void ppc64_boot_msg(unsigned int src
, const char *msg
)
1084 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_IPL_MESSAGE
|src
, msg
);
1085 printk("[boot]%04x %s\n", src
, msg
);
1088 /* Print a termination message (print only -- does not stop the kernel) */
1089 void ppc64_terminate_msg(unsigned int src
, const char *msg
)
1091 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_TERM_MESSAGE
|src
, msg
);
1092 printk("[terminate]%04x %s\n", src
, msg
);
1095 /* This should only be called on processor 0 during calibrate decr */
1096 void __init
setup_default_decr(void)
1098 struct paca_struct
*lpaca
= get_paca();
1100 lpaca
->default_decr
= tb_ticks_per_jiffy
;
1101 lpaca
->next_jiffy_update_tb
= get_tb() + tb_ticks_per_jiffy
;
1104 #ifndef CONFIG_PPC_ISERIES
1106 * This function can be used by platforms to "find" legacy serial ports.
1107 * It works for "serial" nodes under an "isa" node, and will try to
1108 * respect the "ibm,aix-loc" property if any. It works with up to 8
1112 #define MAX_LEGACY_SERIAL_PORTS 8
1113 static struct plat_serial8250_port serial_ports
[MAX_LEGACY_SERIAL_PORTS
+1];
1114 static unsigned int old_serial_count
;
1116 void __init
generic_find_legacy_serial_ports(u64
*physport
,
1117 unsigned int *default_speed
)
1119 struct device_node
*np
;
1122 struct isa_reg_property
{
1127 struct pci_reg_property
{
1128 struct pci_address addr
;
1133 DBG(" -> generic_find_legacy_serial_port()\n");
1139 np
= of_find_node_by_path("/");
1143 /* First fill our array */
1144 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
1145 struct device_node
*isa
, *pci
;
1146 struct isa_reg_property
*reg
;
1147 unsigned long phys_size
, addr_size
, io_base
;
1149 u32
*interrupts
, *clk
, *spd
;
1151 int index
, rlen
, rentsize
;
1153 /* Ok, first check if it's under an "isa" parent */
1154 isa
= of_get_parent(np
);
1155 if (!isa
|| strcmp(isa
->name
, "isa")) {
1156 DBG("%s: no isa parent found\n", np
->full_name
);
1160 /* Now look for an "ibm,aix-loc" property that gives us ordering
1163 typep
= (char *)get_property(np
, "ibm,aix-loc", NULL
);
1165 /* Get the ISA port number */
1166 reg
= (struct isa_reg_property
*)get_property(np
, "reg", NULL
);
1169 /* We assume the interrupt number isn't translated ... */
1170 interrupts
= (u32
*)get_property(np
, "interrupts", NULL
);
1171 /* get clock freq. if present */
1172 clk
= (u32
*)get_property(np
, "clock-frequency", NULL
);
1173 /* get default speed if present */
1174 spd
= (u32
*)get_property(np
, "current-speed", NULL
);
1175 /* Default to locate at end of array */
1176 index
= old_serial_count
; /* end of the array by default */
1178 /* If we have a location index, then use it */
1179 if (typep
&& *typep
== 'S') {
1180 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
1181 /* if index is out of range, use end of array instead */
1182 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
1183 index
= old_serial_count
;
1184 /* if our index is still out of range, that mean that
1185 * array is full, we could scan for a free slot but that
1186 * make little sense to bother, just skip the port
1188 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
1190 if (index
>= old_serial_count
)
1191 old_serial_count
= index
+ 1;
1192 /* Check if there is a port who already claimed our slot */
1193 if (serial_ports
[index
].iobase
!= 0) {
1194 /* if we still have some room, move it, else override */
1195 if (old_serial_count
< MAX_LEGACY_SERIAL_PORTS
) {
1196 DBG("Moved legacy port %d -> %d\n", index
,
1198 serial_ports
[old_serial_count
++] =
1199 serial_ports
[index
];
1201 DBG("Replacing legacy port %d\n", index
);
1205 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
1207 if (index
>= old_serial_count
)
1208 old_serial_count
= index
+ 1;
1210 /* Now fill the entry */
1211 memset(&serial_ports
[index
], 0, sizeof(struct plat_serial8250_port
));
1212 serial_ports
[index
].uartclk
= clk
? *clk
: BASE_BAUD
* 16;
1213 serial_ports
[index
].iobase
= reg
->address
;
1214 serial_ports
[index
].irq
= interrupts
? interrupts
[0] : 0;
1215 serial_ports
[index
].flags
= ASYNC_BOOT_AUTOCONF
;
1217 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
1219 serial_ports
[index
].iobase
,
1220 serial_ports
[index
].irq
,
1221 serial_ports
[index
].uartclk
);
1223 /* Get phys address of IO reg for port 1 */
1227 pci
= of_get_parent(isa
);
1229 DBG("%s: no pci parent found\n", np
->full_name
);
1233 rangesp
= (u32
*)get_property(pci
, "ranges", &rlen
);
1234 if (rangesp
== NULL
) {
1240 /* we need the #size-cells of the PCI bridge node itself */
1242 sizeprop
= (u32
*)get_property(pci
, "#size-cells", NULL
);
1243 if (sizeprop
!= NULL
)
1244 phys_size
= *sizeprop
;
1245 /* we need the parent #addr-cells */
1246 addr_size
= prom_n_addr_cells(pci
);
1247 rentsize
= 3 + addr_size
+ phys_size
;
1249 for (;rlen
>= rentsize
; rlen
-= rentsize
,rangesp
+= rentsize
) {
1250 if (((rangesp
[0] >> 24) & 0x3) != 1)
1251 continue; /* not IO space */
1252 io_base
= rangesp
[3];
1254 io_base
= (io_base
<< 32) | rangesp
[4];
1257 *physport
= io_base
+ reg
->address
;
1258 if (default_speed
&& spd
)
1259 *default_speed
= *spd
;
1266 DBG(" <- generic_find_legacy_serial_port()\n");
1269 static struct platform_device serial_device
= {
1270 .name
= "serial8250",
1271 .id
= PLAT8250_DEV_PLATFORM
,
1273 .platform_data
= serial_ports
,
1277 static int __init
serial_dev_init(void)
1279 return platform_device_register(&serial_device
);
1281 arch_initcall(serial_dev_init
);
1283 #endif /* CONFIG_PPC_ISERIES */
1285 int check_legacy_ioport(unsigned long base_port
)
1287 if (ppc_md
.check_legacy_ioport
== NULL
)
1289 return ppc_md
.check_legacy_ioport(base_port
);
1291 EXPORT_SYMBOL(check_legacy_ioport
);
1294 static int __init
early_xmon(char *p
)
1296 /* ensure xmon is enabled */
1298 if (strncmp(p
, "on", 2) == 0)
1300 if (strncmp(p
, "off", 3) == 0)
1302 if (strncmp(p
, "early", 5) != 0)
1310 early_param("xmon", early_xmon
);