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 */
313 #ifdef CONFIG_PPC_MULTIPLATFORM
315 extern struct machdep_calls pSeries_md;
316 extern struct machdep_calls pmac_md;
317 extern struct machdep_calls maple_md;
318 extern struct machdep_calls bpa_md;
320 /* Ultimately, stuff them in an elf section like initcalls... */
321 static struct machdep_calls __initdata *machines[] = {
322 #ifdef CONFIG_PPC_PSERIES
324 #endif /* CONFIG_PPC_PSERIES */
325 #ifdef CONFIG_PPC_PMAC
327 #endif /* CONFIG_PPC_PMAC */
328 #ifdef CONFIG_PPC_MAPLE
330 #endif /* CONFIG_PPC_MAPLE */
331 #ifdef CONFIG_PPC_BPA
338 * Early initialization entry point. This is called by head.S
339 * with MMU translation disabled. We rely on the "feature" of
340 * the CPU that ignores the top 2 bits of the address in real
341 * mode so we can access kernel globals normally provided we
342 * only toy with things in the RMO region. From here, we do
343 * some early parsing of the device-tree to setup out LMB
344 * data structures, and allocate & initialize the hash table
345 * and segment tables so we can start running with translation
348 * It is this function which will call the probe() callback of
349 * the various platform types and copy the matching one to the
350 * global ppc_md structure. Your platform can eventually do
351 * some very early initializations from the probe() routine, but
352 * this is not recommended, be very careful as, for example, the
353 * device-tree is not accessible via normal means at this point.
356 void __init early_setup(unsigned long dt_ptr)
358 struct paca_struct *lpaca = get_paca();
359 static struct machdep_calls **mach;
362 * Enable early debugging if any specified (see top of
367 DBG(" -> early_setup()\n");
370 * Fill the default DBG level (do we want to keep
371 * that old mecanism around forever ?)
376 * Do early initializations using the flattened device
377 * tree, like retreiving the physical memory map or
378 * calculating/retreiving the hash table size
380 early_init_devtree(__va(dt_ptr));
383 * Iterate all ppc_md structures until we find the proper
384 * one for the current machine type
386 DBG("Probing machine type for platform %x...\n",
387 systemcfg->platform);
389 for (mach = machines; *mach; mach++) {
390 if ((*mach)->probe(systemcfg->platform))
393 /* What can we do if we didn't find ? */
395 DBG("No suitable machine found !\n");
400 DBG("Found, Initializing memory management...\n");
403 * Initialize stab / SLB management
405 if (!firmware_has_feature(FW_FEATURE_ISERIES))
406 stab_initialize(lpaca->stab_real);
409 * Initialize the MMU Hash table and create the linear mapping
414 DBG(" <- early_setup()\n");
419 * Initialize some remaining members of the ppc64_caches and systemcfg structures
420 * (at least until we get rid of them completely). This is mostly some
421 * cache informations about the CPU that will be used by cache flush
422 * routines and/or provided to userland
424 static void __init initialize_cache_info(void)
426 struct device_node *np;
427 unsigned long num_cpus = 0;
429 DBG(" -> initialize_cache_info()\n");
431 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
434 /* We're assuming *all* of the CPUs have the same
435 * d-cache and i-cache sizes... -Peter
438 if ( num_cpus == 1 ) {
443 /* Then read cache informations */
444 if (systemcfg->platform == PLATFORM_POWERMAC) {
445 dc = "d-cache-block-size";
446 ic = "i-cache-block-size";
448 dc = "d-cache-line-size";
449 ic = "i-cache-line-size";
453 lsize = cur_cpu_spec->dcache_bsize;
454 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
457 lsizep = (u32 *) get_property(np, dc, NULL);
460 if (sizep == 0 || lsizep == 0)
461 DBG("Argh, can't find dcache properties ! "
462 "sizep: %p, lsizep: %p\n", sizep, lsizep);
464 systemcfg->dcache_size = ppc64_caches.dsize = size;
465 systemcfg->dcache_line_size =
466 ppc64_caches.dline_size = lsize;
467 ppc64_caches.log_dline_size = __ilog2(lsize);
468 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
471 lsize = cur_cpu_spec->icache_bsize;
472 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
475 lsizep = (u32 *)get_property(np, ic, NULL);
478 if (sizep == 0 || lsizep == 0)
479 DBG("Argh, can't find icache properties ! "
480 "sizep: %p, lsizep: %p\n", sizep, lsizep);
482 systemcfg->icache_size = ppc64_caches.isize = size;
483 systemcfg->icache_line_size =
484 ppc64_caches.iline_size = lsize;
485 ppc64_caches.log_iline_size = __ilog2(lsize);
486 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
490 /* Add an eye catcher and the systemcfg layout version number */
491 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
492 systemcfg->version.major = SYSTEMCFG_MAJOR;
493 systemcfg->version.minor = SYSTEMCFG_MINOR;
494 systemcfg->processor = mfspr(SPRN_PVR);
496 DBG(" <- initialize_cache_info()\n");
499 static void __init check_for_initrd(void)
501 #ifdef CONFIG_BLK_DEV_INITRD
504 DBG(" -> check_for_initrd()\n");
507 prop = (u64 *)get_property(of_chosen,
508 "linux,initrd-start", NULL);
510 initrd_start = (unsigned long)__va(*prop);
511 prop = (u64 *)get_property(of_chosen,
512 "linux,initrd-end", NULL);
514 initrd_end = (unsigned long)__va(*prop);
515 initrd_below_start_ok = 1;
521 /* If we were passed an initrd, set the ROOT_DEV properly if the values
522 * look sensible. If not, clear initrd reference.
524 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
525 initrd_end > initrd_start)
526 ROOT_DEV = Root_RAM0;
528 initrd_start = initrd_end = 0;
531 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
533 DBG(" <- check_for_initrd()\n");
534 #endif /* CONFIG_BLK_DEV_INITRD */
537 #endif /* CONFIG_PPC_MULTIPLATFORM */
540 * Do some initial setup of the system. The parameters are those which
541 * were passed in from the bootloader.
543 void __init setup_system(void)
545 DBG(" -> setup_system()\n");
547 #ifdef CONFIG_PPC_ISERIES
548 /* pSeries systems are identified in prom.c via OF. */
549 if (itLpNaca.xLparInstalled == 1)
550 systemcfg->platform = PLATFORM_ISERIES_LPAR;
553 #else /* CONFIG_PPC_ISERIES */
556 * Unflatten the device-tree passed by prom_init or kexec
558 unflatten_device_tree();
561 * Fill the ppc64_caches & systemcfg structures with informations
562 * retreived from the device-tree. Need to be called before
563 * finish_device_tree() since the later requires some of the
564 * informations filled up here to properly parse the interrupt
566 * It also sets up the cache line sizes which allows to call
567 * routines like flush_icache_range (used by the hash init
570 initialize_cache_info();
572 #ifdef CONFIG_PPC_RTAS
574 * Initialize RTAS if available
577 #endif /* CONFIG_PPC_RTAS */
580 * Check if we have an initrd provided via the device-tree
585 * Do some platform specific early initializations, that includes
586 * setting up the hash table pointers. It also sets up some interrupt-mapping
587 * related options that will be used by finish_device_tree()
592 * "Finish" the device-tree, that is do the actual parsing of
593 * some of the properties like the interrupt map
595 finish_device_tree();
600 #ifdef CONFIG_XMON_DEFAULT
604 * Register early console
606 register_early_udbg_console();
608 /* Save unparsed command line copy for /proc/cmdline */
609 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
612 #endif /* !CONFIG_PPC_ISERIES */
616 * iSeries has already initialized the cpu maps at this point.
620 /* Release secondary cpus out of their spinloops at 0x60 now that
621 * we can map physical -> logical CPU ids
626 printk("Starting Linux PPC64 %s\n", system_utsname.version);
628 printk("-----------------------------------------------------\n");
629 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
630 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
631 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
632 printk("systemcfg = 0x%p\n", systemcfg);
633 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
634 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
635 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
636 printk("ppc64_caches.dcache_line_size = 0x%x\n",
637 ppc64_caches.dline_size);
638 printk("ppc64_caches.icache_line_size = 0x%x\n",
639 ppc64_caches.iline_size);
640 printk("htab_address = 0x%p\n", htab_address);
641 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
642 printk("-----------------------------------------------------\n");
646 DBG(" <- setup_system()\n");
649 /* also used by kexec */
650 void machine_shutdown(void)
652 if (ppc_md.nvram_sync)
656 void machine_restart(char *cmd)
663 printk(KERN_EMERG "System Halted, OK to turn off power\n");
668 void machine_power_off(void)
675 printk(KERN_EMERG "System Halted, OK to turn off power\n");
679 /* Used by the G5 thermal driver */
680 EXPORT_SYMBOL_GPL(machine_power_off);
682 void machine_halt(void)
689 printk(KERN_EMERG "System Halted, OK to turn off power\n");
694 static int ppc64_panic_event(struct notifier_block *this,
695 unsigned long event, void *ptr)
697 ppc_md.panic((char *)ptr); /* May not return */
703 DEFINE_PER_CPU(unsigned int, pvr);
706 static int show_cpuinfo(struct seq_file *m, void *v)
708 unsigned long cpu_id = (unsigned long)v - 1;
713 if (cpu_id == NR_CPUS) {
714 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
716 if (ppc_md.get_cpuinfo != NULL)
717 ppc_md.get_cpuinfo(m);
722 /* We only show online cpus: disable preempt (overzealous, I
723 * knew) to prevent cpu going down. */
725 if (!cpu_online(cpu_id)) {
731 pvr = per_cpu(pvr, cpu_id);
733 pvr = mfspr(SPRN_PVR);
735 maj = (pvr >> 8) & 0xFF;
738 seq_printf(m, "processor\t: %lu\n", cpu_id);
739 seq_printf(m, "cpu\t\t: ");
741 if (cur_cpu_spec->pvr_mask)
742 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
744 seq_printf(m, "unknown (%08x)", pvr);
746 #ifdef CONFIG_ALTIVEC
747 if (cpu_has_feature(CPU_FTR_ALTIVEC))
748 seq_printf(m, ", altivec supported");
749 #endif /* CONFIG_ALTIVEC */
754 * Assume here that all clock rates are the same in a
755 * smp system. -- Cort
757 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
758 ppc_proc_freq % 1000000);
760 seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);
766 static void *c_start(struct seq_file *m, loff_t *pos)
768 return *pos <= NR_CPUS ? (void *)((*pos)+1) : NULL;
770 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
773 return c_start(m, pos);
775 static void c_stop(struct seq_file *m, void *v)
778 struct seq_operations cpuinfo_op = {
782 .show = show_cpuinfo,
786 * These three variables are used to save values passed to us by prom_init()
787 * via the device tree. The TCE variables are needed because with a memory_limit
788 * in force we may need to explicitly map the TCE are at the top of RAM.
790 unsigned long memory_limit;
791 unsigned long tce_alloc_start;
792 unsigned long tce_alloc_end;
794 #ifdef CONFIG_PPC_ISERIES
796 * On iSeries we just parse the mem=X option from the command line.
797 * On pSeries it's a bit more complicated, see prom_init_mem()
799 static int __init early_parsemem(char *p)
804 memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
808 early_param("mem", early_parsemem);
809 #endif /* CONFIG_PPC_ISERIES */
811 #ifdef CONFIG_PPC_MULTIPLATFORM
812 static int __init set_preferred_console(void)
814 struct device_node *prom_stdout = NULL;
819 DBG(" -> set_preferred_console()\n");
821 /* The user has requested a console so this is already set up. */
822 if (strstr(saved_command_line, "console=")) {
823 DBG(" console was specified !\n");
828 DBG(" of_chosen is NULL !\n");
831 /* We are getting a weird phandle from OF ... */
832 /* ... So use the full path instead */
833 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
835 DBG(" no linux,stdout-path !\n");
838 prom_stdout = of_find_node_by_path(name);
840 DBG(" can't find stdout package %s !\n", name);
843 DBG("stdout is %s\n", prom_stdout->full_name);
845 name = (char *)get_property(prom_stdout, "name", NULL);
847 DBG(" stdout package has no name !\n");
850 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
854 #ifdef CONFIG_SERIAL_8250_CONSOLE
855 else if (strcmp(name, "serial") == 0) {
857 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
873 /* We dont recognise the serial port */
878 #endif /* CONFIG_SERIAL_8250_CONSOLE */
879 #ifdef CONFIG_PPC_PSERIES
880 else if (strcmp(name, "vty") == 0) {
881 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
882 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
884 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
885 /* Host Virtual Serial Interface */
897 of_node_put(prom_stdout);
898 DBG("Found hvsi console at offset %d\n", offset);
899 return add_preferred_console("hvsi", offset, NULL);
901 /* pSeries LPAR virtual console */
902 of_node_put(prom_stdout);
903 DBG("Found hvc console\n");
904 return add_preferred_console("hvc", 0, NULL);
907 #endif /* CONFIG_PPC_PSERIES */
908 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
909 else if (strcmp(name, "ch-a") == 0)
911 else if (strcmp(name, "ch-b") == 0)
913 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
916 of_node_put(prom_stdout);
918 DBG("Found serial console at ttyS%d\n", offset);
921 static char __initdata opt[16];
922 sprintf(opt, "%d", *spd);
923 return add_preferred_console("ttyS", offset, opt);
925 return add_preferred_console("ttyS", offset, NULL);
928 DBG("No preferred console found !\n");
929 of_node_put(prom_stdout);
932 console_initcall(set_preferred_console);
933 #endif /* CONFIG_PPC_MULTIPLATFORM */
935 #ifdef CONFIG_IRQSTACKS
936 static void __init irqstack_early_init(void)
941 * interrupt stacks must be under 256MB, we cannot afford to take
942 * SLB misses on them.
945 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
946 THREAD_SIZE, 0x10000000));
947 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
948 THREAD_SIZE, 0x10000000));
952 #define irqstack_early_init()
956 * Stack space used when we detect a bad kernel stack pointer, and
957 * early in SMP boots before relocation is enabled.
959 static void __init emergency_stack_init(void)
965 * Emergency stacks must be under 256MB, we cannot afford to take
966 * SLB misses on them. The ABI also requires them to be 128-byte
969 * Since we use these as temporary stacks during secondary CPU
970 * bringup, we need to get at them in real mode. This means they
971 * must also be within the RMO region.
973 limit = min(0x10000000UL, lmb.rmo_size);
976 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
981 * Called from setup_arch to initialize the bitmap of available
982 * syscalls in the systemcfg page
984 void __init setup_syscall_map(void)
986 unsigned int i, count64 = 0, count32 = 0;
987 extern unsigned long *sys_call_table;
988 extern unsigned long *sys_call_table32;
989 extern unsigned long sys_ni_syscall;
992 for (i = 0; i < __NR_syscalls; i++) {
993 if (sys_call_table[i] == sys_ni_syscall)
996 systemcfg->syscall_map_64[i >> 5] |= 0x80000000UL >> (i & 0x1f);
998 for (i = 0; i < __NR_syscalls; i++) {
999 if (sys_call_table32[i] == sys_ni_syscall)
1002 systemcfg->syscall_map_32[i >> 5] |= 0x80000000UL >> (i & 0x1f);
1004 printk(KERN_INFO "Syscall map setup, %d 32 bits and %d 64 bits syscalls\n",
1009 * Called into from start_kernel, after lock_kernel has been called.
1010 * Initializes bootmem, which is unsed to manage page allocation until
1011 * mem_init is called.
1013 void __init setup_arch(char **cmdline_p)
1015 extern void do_init_bootmem(void);
1017 ppc64_boot_msg(0x12, "Setup Arch");
1019 *cmdline_p = cmd_line;
1022 * Set cache line size based on type of cpu as a default.
1023 * Systems with OF can look in the properties on the cpu node(s)
1024 * for a possibly more accurate value.
1026 dcache_bsize = ppc64_caches.dline_size;
1027 icache_bsize = ppc64_caches.iline_size;
1029 /* reboot on panic */
1030 panic_timeout = 180;
1033 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
1035 init_mm.start_code = PAGE_OFFSET;
1036 init_mm.end_code = (unsigned long) _etext;
1037 init_mm.end_data = (unsigned long) _edata;
1038 init_mm.brk = klimit;
1040 irqstack_early_init();
1041 emergency_stack_init();
1045 /* set up the bootmem stuff with available memory */
1049 /* initialize the syscall map in systemcfg */
1050 setup_syscall_map();
1052 ppc_md.setup_arch();
1054 /* Use the default idle loop if the platform hasn't provided one. */
1055 if (NULL == ppc_md.idle_loop) {
1056 ppc_md.idle_loop = default_idle;
1057 printk(KERN_INFO "Using default idle loop\n");
1061 ppc64_boot_msg(0x15, "Setup Done");
1065 /* ToDo: do something useful if ppc_md is not yet setup. */
1066 #define PPC64_LINUX_FUNCTION 0x0f000000
1067 #define PPC64_IPL_MESSAGE 0xc0000000
1068 #define PPC64_TERM_MESSAGE 0xb0000000
1070 static void ppc64_do_msg(unsigned int src, const char *msg)
1072 if (ppc_md.progress) {
1075 sprintf(buf, "%08X\n", src);
1076 ppc_md.progress(buf, 0);
1077 snprintf(buf, 128, "%s", msg);
1078 ppc_md.progress(buf, 0);
1082 /* Print a boot progress message. */
1083 void ppc64_boot_msg(unsigned int src, const char *msg)
1085 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
1086 printk("[boot]%04x %s\n", src, msg);
1089 /* Print a termination message (print only -- does not stop the kernel) */
1090 void ppc64_terminate_msg(unsigned int src, const char *msg)
1092 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
1093 printk("[terminate]%04x %s\n", src, msg);
1096 /* This should only be called on processor 0 during calibrate decr */
1097 void __init setup_default_decr(void)
1099 struct paca_struct *lpaca = get_paca();
1101 lpaca->default_decr = tb_ticks_per_jiffy;
1102 lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
1105 #ifndef CONFIG_PPC_ISERIES
1107 * This function can be used by platforms to "find" legacy serial ports.
1108 * It works for "serial" nodes under an "isa" node, and will try to
1109 * respect the "ibm,aix-loc" property if any. It works with up to 8
1113 #define MAX_LEGACY_SERIAL_PORTS 8
1114 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
1115 static unsigned int old_serial_count;
1117 void __init generic_find_legacy_serial_ports(u64 *physport,
1118 unsigned int *default_speed)
1120 struct device_node *np;
1123 struct isa_reg_property {
1128 struct pci_reg_property {
1129 struct pci_address addr;
1134 DBG(" -> generic_find_legacy_serial_port()\n");
1140 np = of_find_node_by_path("/");
1144 /* First fill our array */
1145 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
1146 struct device_node *isa, *pci;
1147 struct isa_reg_property *reg;
1148 unsigned long phys_size, addr_size, io_base;
1150 u32 *interrupts, *clk, *spd;
1152 int index, rlen, rentsize;
1154 /* Ok, first check if it's under an "isa" parent */
1155 isa = of_get_parent(np);
1156 if (!isa || strcmp(isa->name, "isa")) {
1157 DBG("%s: no isa parent found\n", np->full_name);
1161 /* Now look for an "ibm,aix-loc" property that gives us ordering
1164 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
1166 /* Get the ISA port number */
1167 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
1170 /* We assume the interrupt number isn't translated ... */
1171 interrupts = (u32 *)get_property(np, "interrupts", NULL);
1172 /* get clock freq. if present */
1173 clk = (u32 *)get_property(np, "clock-frequency", NULL);
1174 /* get default speed if present */
1175 spd = (u32 *)get_property(np, "current-speed", NULL);
1176 /* Default to locate at end of array */
1177 index = old_serial_count; /* end of the array by default */
1179 /* If we have a location index, then use it */
1180 if (typep && *typep == 'S') {
1181 index = simple_strtol(typep+1, NULL, 0) - 1;
1182 /* if index is out of range, use end of array instead */
1183 if (index >= MAX_LEGACY_SERIAL_PORTS)
1184 index = old_serial_count;
1185 /* if our index is still out of range, that mean that
1186 * array is full, we could scan for a free slot but that
1187 * make little sense to bother, just skip the port
1189 if (index >= MAX_LEGACY_SERIAL_PORTS)
1191 if (index >= old_serial_count)
1192 old_serial_count = index + 1;
1193 /* Check if there is a port who already claimed our slot */
1194 if (serial_ports[index].iobase != 0) {
1195 /* if we still have some room, move it, else override */
1196 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
1197 DBG("Moved legacy port %d -> %d\n", index,
1199 serial_ports[old_serial_count++] =
1200 serial_ports[index];
1202 DBG("Replacing legacy port %d\n", index);
1206 if (index >= MAX_LEGACY_SERIAL_PORTS)
1208 if (index >= old_serial_count)
1209 old_serial_count = index + 1;
1211 /* Now fill the entry */
1212 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
1213 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
1214 serial_ports[index].iobase = reg->address;
1215 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
1216 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
1218 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
1220 serial_ports[index].iobase,
1221 serial_ports[index].irq,
1222 serial_ports[index].uartclk);
1224 /* Get phys address of IO reg for port 1 */
1228 pci = of_get_parent(isa);
1230 DBG("%s: no pci parent found\n", np->full_name);
1234 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
1235 if (rangesp == NULL) {
1241 /* we need the #size-cells of the PCI bridge node itself */
1243 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
1244 if (sizeprop != NULL)
1245 phys_size = *sizeprop;
1246 /* we need the parent #addr-cells */
1247 addr_size = prom_n_addr_cells(pci);
1248 rentsize = 3 + addr_size + phys_size;
1250 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
1251 if (((rangesp[0] >> 24) & 0x3) != 1)
1252 continue; /* not IO space */
1253 io_base = rangesp[3];
1255 io_base = (io_base << 32) | rangesp[4];
1258 *physport = io_base + reg->address;
1259 if (default_speed && spd)
1260 *default_speed = *spd;
1267 DBG(" <- generic_find_legacy_serial_port()\n");
1270 static struct platform_device serial_device = {
1271 .name = "serial8250",
1272 .id = PLAT8250_DEV_PLATFORM,
1274 .platform_data = serial_ports,
1278 static int __init serial_dev_init(void)
1280 return platform_device_register(&serial_device);
1282 arch_initcall(serial_dev_init);
1284 #endif /* CONFIG_PPC_ISERIES */
1286 int check_legacy_ioport(unsigned long base_port)
1288 if (ppc_md.check_legacy_ioport == NULL)
1290 return ppc_md.check_legacy_ioport(base_port);
1292 EXPORT_SYMBOL(check_legacy_ioport);
1295 static int __init early_xmon(char *p)
1297 /* ensure xmon is enabled */
1299 if (strncmp(p, "on", 2) == 0)
1301 if (strncmp(p, "off", 3) == 0)
1303 if (strncmp(p, "early", 5) != 0)
1311 early_param("xmon", early_xmon);