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 /* For use on LPAR machines that support an HVC console on vterm 0 */
79 extern void udbg_init_debug_lpar(void);
81 /* This one is for use on Apple G5 machines */
82 extern void udbg_init_pmac_realmode(void);
84 /* That's RTAS panel debug */
85 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 /* For iSeries - hit Ctrl-x Ctrl-x to see the output */
91 extern void udbg_init_iseries(void);
93 #define EARLY_DEBUG_INIT() do {} while(0)
96 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
97 #define EARLY_DEBUG_INIT() udbg_init_iseries()
98 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
99 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
100 #define EARLY_DEBUG_INIT() \
101 do { udbg_putc = call_rtas_display_status_delay; } while(0)
106 int boot_cpuid_phys = 0;
110 /* Pick defaults since we might want to patch instructions
111 * before we've read this from the device tree.
113 struct ppc64_caches ppc64_caches = {
119 EXPORT_SYMBOL_GPL(ppc64_caches);
122 * These are used in binfmt_elf.c to put aux entries on the stack
123 * for each elf executable being started.
129 /* The main machine-dep calls structure
131 struct machdep_calls ppc_md;
132 EXPORT_SYMBOL(ppc_md);
134 #ifdef CONFIG_MAGIC_SYSRQ
135 unsigned long SYSRQ_KEY;
136 #endif /* CONFIG_MAGIC_SYSRQ */
139 static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
140 static struct notifier_block ppc64_panic_block = {
141 .notifier_call = ppc64_panic_event,
142 .priority = INT_MIN /* may not return; must be done last */
147 static int smt_enabled_cmdline;
149 /* Look for ibm,smt-enabled OF option */
150 static void check_smt_enabled(void)
152 struct device_node *dn;
155 /* Allow the command line to overrule the OF option */
156 if (smt_enabled_cmdline)
159 dn = of_find_node_by_path("/options");
162 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
165 if (!strcmp(smt_option, "on"))
166 smt_enabled_at_boot = 1;
167 else if (!strcmp(smt_option, "off"))
168 smt_enabled_at_boot = 0;
173 /* Look for smt-enabled= cmdline option */
174 static int __init early_smt_enabled(char *p)
176 smt_enabled_cmdline = 1;
181 if (!strcmp(p, "on") || !strcmp(p, "1"))
182 smt_enabled_at_boot = 1;
183 else if (!strcmp(p, "off") || !strcmp(p, "0"))
184 smt_enabled_at_boot = 0;
188 early_param("smt-enabled", early_smt_enabled);
191 #define check_smt_enabled()
192 #endif /* CONFIG_SMP */
194 extern struct machdep_calls pSeries_md;
195 extern struct machdep_calls pmac_md;
196 extern struct machdep_calls maple_md;
197 extern struct machdep_calls cell_md;
198 extern struct machdep_calls iseries_md;
200 /* Ultimately, stuff them in an elf section like initcalls... */
201 static struct machdep_calls __initdata *machines[] = {
202 #ifdef CONFIG_PPC_PSERIES
204 #endif /* CONFIG_PPC_PSERIES */
205 #ifdef CONFIG_PPC_PMAC
207 #endif /* CONFIG_PPC_PMAC */
208 #ifdef CONFIG_PPC_MAPLE
210 #endif /* CONFIG_PPC_MAPLE */
211 #ifdef CONFIG_PPC_CELL
214 #ifdef CONFIG_PPC_ISERIES
221 * Early initialization entry point. This is called by head.S
222 * with MMU translation disabled. We rely on the "feature" of
223 * the CPU that ignores the top 2 bits of the address in real
224 * mode so we can access kernel globals normally provided we
225 * only toy with things in the RMO region. From here, we do
226 * some early parsing of the device-tree to setup out LMB
227 * data structures, and allocate & initialize the hash table
228 * and segment tables so we can start running with translation
231 * It is this function which will call the probe() callback of
232 * the various platform types and copy the matching one to the
233 * global ppc_md structure. Your platform can eventually do
234 * some very early initializations from the probe() routine, but
235 * this is not recommended, be very careful as, for example, the
236 * device-tree is not accessible via normal means at this point.
239 void __init early_setup(unsigned long dt_ptr)
241 struct paca_struct *lpaca = get_paca();
242 static struct machdep_calls **mach;
245 * Enable early debugging if any specified (see top of
250 DBG(" -> early_setup()\n");
253 * Do early initializations using the flattened device
254 * tree, like retreiving the physical memory map or
255 * calculating/retreiving the hash table size
257 early_init_devtree(__va(dt_ptr));
260 * Iterate all ppc_md structures until we find the proper
261 * one for the current machine type
263 DBG("Probing machine type for platform %x...\n", _machine);
265 for (mach = machines; *mach; mach++) {
266 if ((*mach)->probe(_machine))
269 /* What can we do if we didn't find ? */
271 DBG("No suitable machine found !\n");
276 #ifdef CONFIG_CRASH_DUMP
280 DBG("Found, Initializing memory management...\n");
283 * Initialize the MMU Hash table and create the linear mapping
284 * of memory. Has to be done before stab/slb initialization as
285 * this is currently where the page size encoding is obtained
290 * Initialize stab / SLB management except on iSeries
292 if (!firmware_has_feature(FW_FEATURE_ISERIES)) {
293 if (cpu_has_feature(CPU_FTR_SLB))
296 stab_initialize(lpaca->stab_real);
299 DBG(" <- early_setup()\n");
303 void early_setup_secondary(void)
305 struct paca_struct *lpaca = get_paca();
307 /* Mark enabled in PACA */
308 lpaca->proc_enabled = 0;
310 /* Initialize hash table for that CPU */
311 htab_initialize_secondary();
313 /* Initialize STAB/SLB. We use a virtual address as it works
314 * in real mode on pSeries and we want a virutal address on
317 if (cpu_has_feature(CPU_FTR_SLB))
320 stab_initialize(lpaca->stab_addr);
323 #endif /* CONFIG_SMP */
325 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
326 void smp_release_cpus(void)
328 extern unsigned long __secondary_hold_spinloop;
331 DBG(" -> smp_release_cpus()\n");
333 /* All secondary cpus are spinning on a common spinloop, release them
334 * all now so they can start to spin on their individual paca
335 * spinloops. For non SMP kernels, the secondary cpus never get out
336 * of the common spinloop.
337 * This is useless but harmless on iSeries, secondaries are already
338 * waiting on their paca spinloops. */
340 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
345 DBG(" <- smp_release_cpus()\n");
348 #define smp_release_cpus()
349 #endif /* CONFIG_SMP || CONFIG_KEXEC */
352 * Initialize some remaining members of the ppc64_caches and systemcfg
354 * (at least until we get rid of them completely). This is mostly some
355 * cache informations about the CPU that will be used by cache flush
356 * routines and/or provided to userland
358 static void __init initialize_cache_info(void)
360 struct device_node *np;
361 unsigned long num_cpus = 0;
363 DBG(" -> initialize_cache_info()\n");
365 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
368 /* We're assuming *all* of the CPUs have the same
369 * d-cache and i-cache sizes... -Peter
372 if ( num_cpus == 1 ) {
377 /* Then read cache informations */
378 if (_machine == PLATFORM_POWERMAC) {
379 dc = "d-cache-block-size";
380 ic = "i-cache-block-size";
382 dc = "d-cache-line-size";
383 ic = "i-cache-line-size";
387 lsize = cur_cpu_spec->dcache_bsize;
388 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
391 lsizep = (u32 *) get_property(np, dc, NULL);
394 if (sizep == 0 || lsizep == 0)
395 DBG("Argh, can't find dcache properties ! "
396 "sizep: %p, lsizep: %p\n", sizep, lsizep);
398 ppc64_caches.dsize = size;
399 ppc64_caches.dline_size = lsize;
400 ppc64_caches.log_dline_size = __ilog2(lsize);
401 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
404 lsize = cur_cpu_spec->icache_bsize;
405 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
408 lsizep = (u32 *)get_property(np, ic, NULL);
411 if (sizep == 0 || lsizep == 0)
412 DBG("Argh, can't find icache properties ! "
413 "sizep: %p, lsizep: %p\n", sizep, lsizep);
415 ppc64_caches.isize = size;
416 ppc64_caches.iline_size = lsize;
417 ppc64_caches.log_iline_size = __ilog2(lsize);
418 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
422 DBG(" <- initialize_cache_info()\n");
427 * Do some initial setup of the system. The parameters are those which
428 * were passed in from the bootloader.
430 void __init setup_system(void)
432 DBG(" -> setup_system()\n");
435 * Unflatten the device-tree passed by prom_init or kexec
437 unflatten_device_tree();
440 kexec_setup(); /* requires unflattened device tree. */
444 * Fill the ppc64_caches & systemcfg structures with informations
445 * retrieved from the device-tree. Need to be called before
446 * finish_device_tree() since the later requires some of the
447 * informations filled up here to properly parse the interrupt
449 * It also sets up the cache line sizes which allows to call
450 * routines like flush_icache_range (used by the hash init
453 initialize_cache_info();
455 #ifdef CONFIG_PPC_RTAS
457 * Initialize RTAS if available
460 #endif /* CONFIG_PPC_RTAS */
463 * Check if we have an initrd provided via the device-tree
468 * Do some platform specific early initializations, that includes
469 * setting up the hash table pointers. It also sets up some interrupt-mapping
470 * related options that will be used by finish_device_tree()
475 * We can discover serial ports now since the above did setup the
476 * hash table management for us, thus ioremap works. We do that early
477 * so that further code can be debugged
479 find_legacy_serial_ports();
482 * "Finish" the device-tree, that is do the actual parsing of
483 * some of the properties like the interrupt map
485 finish_device_tree();
490 #ifdef CONFIG_XMON_DEFAULT
494 * Register early console
496 register_early_udbg_console();
498 /* Save unparsed command line copy for /proc/cmdline */
499 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
504 smp_setup_cpu_maps();
506 /* Release secondary cpus out of their spinloops at 0x60 now that
507 * we can map physical -> logical CPU ids
511 printk("Starting Linux PPC64 %s\n", system_utsname.version);
513 printk("-----------------------------------------------------\n");
514 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
515 printk("ppc64_interrupt_controller = 0x%ld\n",
516 ppc64_interrupt_controller);
517 printk("platform = 0x%x\n", _machine);
518 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
519 printk("ppc64_caches.dcache_line_size = 0x%x\n",
520 ppc64_caches.dline_size);
521 printk("ppc64_caches.icache_line_size = 0x%x\n",
522 ppc64_caches.iline_size);
523 printk("htab_address = 0x%p\n", htab_address);
524 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
525 #if PHYSICAL_START > 0
526 printk("physical_start = 0x%x\n", PHYSICAL_START);
528 printk("-----------------------------------------------------\n");
532 DBG(" <- setup_system()\n");
535 static int ppc64_panic_event(struct notifier_block *this,
536 unsigned long event, void *ptr)
538 ppc_md.panic((char *)ptr); /* May not return */
542 #ifdef CONFIG_IRQSTACKS
543 static void __init irqstack_early_init(void)
548 * interrupt stacks must be under 256MB, we cannot afford to take
549 * SLB misses on them.
552 softirq_ctx[i] = (struct thread_info *)
553 __va(lmb_alloc_base(THREAD_SIZE,
554 THREAD_SIZE, 0x10000000));
555 hardirq_ctx[i] = (struct thread_info *)
556 __va(lmb_alloc_base(THREAD_SIZE,
557 THREAD_SIZE, 0x10000000));
561 #define irqstack_early_init()
565 * Stack space used when we detect a bad kernel stack pointer, and
566 * early in SMP boots before relocation is enabled.
568 static void __init emergency_stack_init(void)
574 * Emergency stacks must be under 256MB, we cannot afford to take
575 * SLB misses on them. The ABI also requires them to be 128-byte
578 * Since we use these as temporary stacks during secondary CPU
579 * bringup, we need to get at them in real mode. This means they
580 * must also be within the RMO region.
582 limit = min(0x10000000UL, lmb.rmo_size);
585 paca[i].emergency_sp =
586 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
590 * Called into from start_kernel, after lock_kernel has been called.
591 * Initializes bootmem, which is unsed to manage page allocation until
592 * mem_init is called.
594 void __init setup_arch(char **cmdline_p)
596 extern void do_init_bootmem(void);
598 ppc64_boot_msg(0x12, "Setup Arch");
600 *cmdline_p = cmd_line;
603 * Set cache line size based on type of cpu as a default.
604 * Systems with OF can look in the properties on the cpu node(s)
605 * for a possibly more accurate value.
607 dcache_bsize = ppc64_caches.dline_size;
608 icache_bsize = ppc64_caches.iline_size;
610 /* reboot on panic */
614 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
616 init_mm.start_code = PAGE_OFFSET;
617 init_mm.end_code = (unsigned long) _etext;
618 init_mm.end_data = (unsigned long) _edata;
619 init_mm.brk = klimit;
621 irqstack_early_init();
622 emergency_stack_init();
626 /* set up the bootmem stuff with available memory */
630 #ifdef CONFIG_DUMMY_CONSOLE
631 conswitchp = &dummy_con;
636 /* Use the default idle loop if the platform hasn't provided one. */
637 if (NULL == ppc_md.idle_loop) {
638 ppc_md.idle_loop = default_idle;
639 printk(KERN_INFO "Using default idle loop\n");
643 ppc64_boot_msg(0x15, "Setup Done");
647 /* ToDo: do something useful if ppc_md is not yet setup. */
648 #define PPC64_LINUX_FUNCTION 0x0f000000
649 #define PPC64_IPL_MESSAGE 0xc0000000
650 #define PPC64_TERM_MESSAGE 0xb0000000
652 static void ppc64_do_msg(unsigned int src, const char *msg)
654 if (ppc_md.progress) {
657 sprintf(buf, "%08X\n", src);
658 ppc_md.progress(buf, 0);
659 snprintf(buf, 128, "%s", msg);
660 ppc_md.progress(buf, 0);
664 /* Print a boot progress message. */
665 void ppc64_boot_msg(unsigned int src, const char *msg)
667 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
668 printk("[boot]%04x %s\n", src, msg);
671 /* Print a termination message (print only -- does not stop the kernel) */
672 void ppc64_terminate_msg(unsigned int src, const char *msg)
674 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
675 printk("[terminate]%04x %s\n", src, msg);
678 int check_legacy_ioport(unsigned long base_port)
680 if (ppc_md.check_legacy_ioport == NULL)
682 return ppc_md.check_legacy_ioport(base_port);
684 EXPORT_SYMBOL(check_legacy_ioport);