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)
75 int boot_cpuid_phys = 0;
79 /* Pick defaults since we might want to patch instructions
80 * before we've read this from the device tree.
82 struct ppc64_caches ppc64_caches = {
88 EXPORT_SYMBOL_GPL(ppc64_caches);
91 * These are used in binfmt_elf.c to put aux entries on the stack
92 * for each elf executable being started.
98 /* The main machine-dep calls structure
100 struct machdep_calls ppc_md;
101 EXPORT_SYMBOL(ppc_md);
103 #ifdef CONFIG_MAGIC_SYSRQ
104 unsigned long SYSRQ_KEY;
105 #endif /* CONFIG_MAGIC_SYSRQ */
108 static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
109 static struct notifier_block ppc64_panic_block = {
110 .notifier_call = ppc64_panic_event,
111 .priority = INT_MIN /* may not return; must be done last */
116 static int smt_enabled_cmdline;
118 /* Look for ibm,smt-enabled OF option */
119 static void check_smt_enabled(void)
121 struct device_node *dn;
124 /* Allow the command line to overrule the OF option */
125 if (smt_enabled_cmdline)
128 dn = of_find_node_by_path("/options");
131 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
134 if (!strcmp(smt_option, "on"))
135 smt_enabled_at_boot = 1;
136 else if (!strcmp(smt_option, "off"))
137 smt_enabled_at_boot = 0;
142 /* Look for smt-enabled= cmdline option */
143 static int __init early_smt_enabled(char *p)
145 smt_enabled_cmdline = 1;
150 if (!strcmp(p, "on") || !strcmp(p, "1"))
151 smt_enabled_at_boot = 1;
152 else if (!strcmp(p, "off") || !strcmp(p, "0"))
153 smt_enabled_at_boot = 0;
157 early_param("smt-enabled", early_smt_enabled);
160 #define check_smt_enabled()
161 #endif /* CONFIG_SMP */
163 extern struct machdep_calls pSeries_md;
164 extern struct machdep_calls pmac_md;
165 extern struct machdep_calls maple_md;
166 extern struct machdep_calls cell_md;
167 extern struct machdep_calls iseries_md;
169 /* Ultimately, stuff them in an elf section like initcalls... */
170 static struct machdep_calls __initdata *machines[] = {
171 #ifdef CONFIG_PPC_PSERIES
173 #endif /* CONFIG_PPC_PSERIES */
174 #ifdef CONFIG_PPC_PMAC
176 #endif /* CONFIG_PPC_PMAC */
177 #ifdef CONFIG_PPC_MAPLE
179 #endif /* CONFIG_PPC_MAPLE */
180 #ifdef CONFIG_PPC_CELL
183 #ifdef CONFIG_PPC_ISERIES
190 * Early initialization entry point. This is called by head.S
191 * with MMU translation disabled. We rely on the "feature" of
192 * the CPU that ignores the top 2 bits of the address in real
193 * mode so we can access kernel globals normally provided we
194 * only toy with things in the RMO region. From here, we do
195 * some early parsing of the device-tree to setup out LMB
196 * data structures, and allocate & initialize the hash table
197 * and segment tables so we can start running with translation
200 * It is this function which will call the probe() callback of
201 * the various platform types and copy the matching one to the
202 * global ppc_md structure. Your platform can eventually do
203 * some very early initializations from the probe() routine, but
204 * this is not recommended, be very careful as, for example, the
205 * device-tree is not accessible via normal means at this point.
208 void __init early_setup(unsigned long dt_ptr)
210 struct paca_struct *lpaca = get_paca();
211 static struct machdep_calls **mach;
213 /* Enable early debugging if any specified (see udbg.h) */
216 DBG(" -> early_setup()\n");
219 * Do early initializations using the flattened device
220 * tree, like retreiving the physical memory map or
221 * calculating/retreiving the hash table size
223 early_init_devtree(__va(dt_ptr));
226 * Iterate all ppc_md structures until we find the proper
227 * one for the current machine type
229 DBG("Probing machine type for platform %x...\n", _machine);
231 for (mach = machines; *mach; mach++) {
232 if ((*mach)->probe(_machine))
235 /* What can we do if we didn't find ? */
237 DBG("No suitable machine found !\n");
242 #ifdef CONFIG_CRASH_DUMP
246 DBG("Found, Initializing memory management...\n");
249 * Initialize the MMU Hash table and create the linear mapping
250 * of memory. Has to be done before stab/slb initialization as
251 * this is currently where the page size encoding is obtained
256 * Initialize stab / SLB management except on iSeries
258 if (!firmware_has_feature(FW_FEATURE_ISERIES)) {
259 if (cpu_has_feature(CPU_FTR_SLB))
262 stab_initialize(lpaca->stab_real);
265 DBG(" <- early_setup()\n");
269 void early_setup_secondary(void)
271 struct paca_struct *lpaca = get_paca();
273 /* Mark enabled in PACA */
274 lpaca->proc_enabled = 0;
276 /* Initialize hash table for that CPU */
277 htab_initialize_secondary();
279 /* Initialize STAB/SLB. We use a virtual address as it works
280 * in real mode on pSeries and we want a virutal address on
283 if (cpu_has_feature(CPU_FTR_SLB))
286 stab_initialize(lpaca->stab_addr);
289 #endif /* CONFIG_SMP */
291 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
292 void smp_release_cpus(void)
294 extern unsigned long __secondary_hold_spinloop;
297 DBG(" -> smp_release_cpus()\n");
299 /* All secondary cpus are spinning on a common spinloop, release them
300 * all now so they can start to spin on their individual paca
301 * spinloops. For non SMP kernels, the secondary cpus never get out
302 * of the common spinloop.
303 * This is useless but harmless on iSeries, secondaries are already
304 * waiting on their paca spinloops. */
306 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
311 DBG(" <- smp_release_cpus()\n");
314 #define smp_release_cpus()
315 #endif /* CONFIG_SMP || CONFIG_KEXEC */
318 * Initialize some remaining members of the ppc64_caches and systemcfg
320 * (at least until we get rid of them completely). This is mostly some
321 * cache informations about the CPU that will be used by cache flush
322 * routines and/or provided to userland
324 static void __init initialize_cache_info(void)
326 struct device_node *np;
327 unsigned long num_cpus = 0;
329 DBG(" -> initialize_cache_info()\n");
331 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
334 /* We're assuming *all* of the CPUs have the same
335 * d-cache and i-cache sizes... -Peter
338 if ( num_cpus == 1 ) {
343 /* Then read cache informations */
344 if (_machine == PLATFORM_POWERMAC) {
345 dc = "d-cache-block-size";
346 ic = "i-cache-block-size";
348 dc = "d-cache-line-size";
349 ic = "i-cache-line-size";
353 lsize = cur_cpu_spec->dcache_bsize;
354 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
357 lsizep = (u32 *) get_property(np, dc, NULL);
360 if (sizep == 0 || lsizep == 0)
361 DBG("Argh, can't find dcache properties ! "
362 "sizep: %p, lsizep: %p\n", sizep, lsizep);
364 ppc64_caches.dsize = size;
365 ppc64_caches.dline_size = lsize;
366 ppc64_caches.log_dline_size = __ilog2(lsize);
367 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
370 lsize = cur_cpu_spec->icache_bsize;
371 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
374 lsizep = (u32 *)get_property(np, ic, NULL);
377 if (sizep == 0 || lsizep == 0)
378 DBG("Argh, can't find icache properties ! "
379 "sizep: %p, lsizep: %p\n", sizep, lsizep);
381 ppc64_caches.isize = size;
382 ppc64_caches.iline_size = lsize;
383 ppc64_caches.log_iline_size = __ilog2(lsize);
384 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
388 DBG(" <- initialize_cache_info()\n");
393 * Do some initial setup of the system. The parameters are those which
394 * were passed in from the bootloader.
396 void __init setup_system(void)
398 DBG(" -> setup_system()\n");
401 * Unflatten the device-tree passed by prom_init or kexec
403 unflatten_device_tree();
406 kexec_setup(); /* requires unflattened device tree. */
410 * Fill the ppc64_caches & systemcfg structures with informations
411 * retrieved from the device-tree. Need to be called before
412 * finish_device_tree() since the later requires some of the
413 * informations filled up here to properly parse the interrupt
415 * It also sets up the cache line sizes which allows to call
416 * routines like flush_icache_range (used by the hash init
419 initialize_cache_info();
421 #ifdef CONFIG_PPC_RTAS
423 * Initialize RTAS if available
426 #endif /* CONFIG_PPC_RTAS */
429 * Check if we have an initrd provided via the device-tree
434 * Do some platform specific early initializations, that includes
435 * setting up the hash table pointers. It also sets up some interrupt-mapping
436 * related options that will be used by finish_device_tree()
441 * We can discover serial ports now since the above did setup the
442 * hash table management for us, thus ioremap works. We do that early
443 * so that further code can be debugged
445 find_legacy_serial_ports();
448 * "Finish" the device-tree, that is do the actual parsing of
449 * some of the properties like the interrupt map
451 finish_device_tree();
456 #ifdef CONFIG_XMON_DEFAULT
460 * Register early console
462 register_early_udbg_console();
464 /* Save unparsed command line copy for /proc/cmdline */
465 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
470 smp_setup_cpu_maps();
472 /* Release secondary cpus out of their spinloops at 0x60 now that
473 * we can map physical -> logical CPU ids
477 printk("Starting Linux PPC64 %s\n", system_utsname.version);
479 printk("-----------------------------------------------------\n");
480 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
481 printk("ppc64_interrupt_controller = 0x%ld\n",
482 ppc64_interrupt_controller);
483 printk("platform = 0x%x\n", _machine);
484 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
485 printk("ppc64_caches.dcache_line_size = 0x%x\n",
486 ppc64_caches.dline_size);
487 printk("ppc64_caches.icache_line_size = 0x%x\n",
488 ppc64_caches.iline_size);
489 printk("htab_address = 0x%p\n", htab_address);
490 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
491 #if PHYSICAL_START > 0
492 printk("physical_start = 0x%x\n", PHYSICAL_START);
494 printk("-----------------------------------------------------\n");
498 DBG(" <- setup_system()\n");
501 static int ppc64_panic_event(struct notifier_block *this,
502 unsigned long event, void *ptr)
504 ppc_md.panic((char *)ptr); /* May not return */
508 #ifdef CONFIG_IRQSTACKS
509 static void __init irqstack_early_init(void)
514 * interrupt stacks must be under 256MB, we cannot afford to take
515 * SLB misses on them.
518 softirq_ctx[i] = (struct thread_info *)
519 __va(lmb_alloc_base(THREAD_SIZE,
520 THREAD_SIZE, 0x10000000));
521 hardirq_ctx[i] = (struct thread_info *)
522 __va(lmb_alloc_base(THREAD_SIZE,
523 THREAD_SIZE, 0x10000000));
527 #define irqstack_early_init()
531 * Stack space used when we detect a bad kernel stack pointer, and
532 * early in SMP boots before relocation is enabled.
534 static void __init emergency_stack_init(void)
540 * Emergency stacks must be under 256MB, we cannot afford to take
541 * SLB misses on them. The ABI also requires them to be 128-byte
544 * Since we use these as temporary stacks during secondary CPU
545 * bringup, we need to get at them in real mode. This means they
546 * must also be within the RMO region.
548 limit = min(0x10000000UL, lmb.rmo_size);
551 paca[i].emergency_sp =
552 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
556 * Called into from start_kernel, after lock_kernel has been called.
557 * Initializes bootmem, which is unsed to manage page allocation until
558 * mem_init is called.
560 void __init setup_arch(char **cmdline_p)
562 extern void do_init_bootmem(void);
564 ppc64_boot_msg(0x12, "Setup Arch");
566 *cmdline_p = cmd_line;
569 * Set cache line size based on type of cpu as a default.
570 * Systems with OF can look in the properties on the cpu node(s)
571 * for a possibly more accurate value.
573 dcache_bsize = ppc64_caches.dline_size;
574 icache_bsize = ppc64_caches.iline_size;
576 /* reboot on panic */
580 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
582 init_mm.start_code = PAGE_OFFSET;
583 init_mm.end_code = (unsigned long) _etext;
584 init_mm.end_data = (unsigned long) _edata;
585 init_mm.brk = klimit;
587 irqstack_early_init();
588 emergency_stack_init();
592 /* set up the bootmem stuff with available memory */
596 #ifdef CONFIG_DUMMY_CONSOLE
597 conswitchp = &dummy_con;
602 /* Use the default idle loop if the platform hasn't provided one. */
603 if (NULL == ppc_md.idle_loop) {
604 ppc_md.idle_loop = default_idle;
605 printk(KERN_INFO "Using default idle loop\n");
609 ppc64_boot_msg(0x15, "Setup Done");
613 /* ToDo: do something useful if ppc_md is not yet setup. */
614 #define PPC64_LINUX_FUNCTION 0x0f000000
615 #define PPC64_IPL_MESSAGE 0xc0000000
616 #define PPC64_TERM_MESSAGE 0xb0000000
618 static void ppc64_do_msg(unsigned int src, const char *msg)
620 if (ppc_md.progress) {
623 sprintf(buf, "%08X\n", src);
624 ppc_md.progress(buf, 0);
625 snprintf(buf, 128, "%s", msg);
626 ppc_md.progress(buf, 0);
630 /* Print a boot progress message. */
631 void ppc64_boot_msg(unsigned int src, const char *msg)
633 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
634 printk("[boot]%04x %s\n", src, msg);
637 /* Print a termination message (print only -- does not stop the kernel) */
638 void ppc64_terminate_msg(unsigned int src, const char *msg)
640 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
641 printk("[terminate]%04x %s\n", src, msg);
644 int check_legacy_ioport(unsigned long base_port)
646 if (ppc_md.check_legacy_ioport == NULL)
648 return ppc_md.check_legacy_ioport(base_port);
650 EXPORT_SYMBOL(check_legacy_ioport);