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();
480 #ifdef CONFIG_XMON_DEFAULT
484 * Register early console
486 register_early_udbg_console();
488 /* Save unparsed command line copy for /proc/cmdline */
489 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
494 smp_setup_cpu_maps();
496 /* Release secondary cpus out of their spinloops at 0x60 now that
497 * we can map physical -> logical CPU ids
501 printk("Starting Linux PPC64 %s\n", system_utsname.version);
503 printk("-----------------------------------------------------\n");
504 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
505 printk("ppc64_interrupt_controller = 0x%ld\n",
506 ppc64_interrupt_controller);
507 printk("platform = 0x%x\n", _machine);
508 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
509 printk("ppc64_caches.dcache_line_size = 0x%x\n",
510 ppc64_caches.dline_size);
511 printk("ppc64_caches.icache_line_size = 0x%x\n",
512 ppc64_caches.iline_size);
513 printk("htab_address = 0x%p\n", htab_address);
514 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
515 printk("-----------------------------------------------------\n");
519 DBG(" <- setup_system()\n");
522 static int ppc64_panic_event(struct notifier_block *this,
523 unsigned long event, void *ptr)
525 ppc_md.panic((char *)ptr); /* May not return */
529 #ifdef CONFIG_IRQSTACKS
530 static void __init irqstack_early_init(void)
535 * interrupt stacks must be under 256MB, we cannot afford to take
536 * SLB misses on them.
539 softirq_ctx[i] = (struct thread_info *)
540 __va(lmb_alloc_base(THREAD_SIZE,
541 THREAD_SIZE, 0x10000000));
542 hardirq_ctx[i] = (struct thread_info *)
543 __va(lmb_alloc_base(THREAD_SIZE,
544 THREAD_SIZE, 0x10000000));
548 #define irqstack_early_init()
552 * Stack space used when we detect a bad kernel stack pointer, and
553 * early in SMP boots before relocation is enabled.
555 static void __init emergency_stack_init(void)
561 * Emergency stacks must be under 256MB, we cannot afford to take
562 * SLB misses on them. The ABI also requires them to be 128-byte
565 * Since we use these as temporary stacks during secondary CPU
566 * bringup, we need to get at them in real mode. This means they
567 * must also be within the RMO region.
569 limit = min(0x10000000UL, lmb.rmo_size);
572 paca[i].emergency_sp =
573 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
577 * Called into from start_kernel, after lock_kernel has been called.
578 * Initializes bootmem, which is unsed to manage page allocation until
579 * mem_init is called.
581 void __init setup_arch(char **cmdline_p)
583 extern void do_init_bootmem(void);
585 ppc64_boot_msg(0x12, "Setup Arch");
587 *cmdline_p = cmd_line;
590 * Set cache line size based on type of cpu as a default.
591 * Systems with OF can look in the properties on the cpu node(s)
592 * for a possibly more accurate value.
594 dcache_bsize = ppc64_caches.dline_size;
595 icache_bsize = ppc64_caches.iline_size;
597 /* reboot on panic */
601 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
603 init_mm.start_code = PAGE_OFFSET;
604 init_mm.end_code = (unsigned long) _etext;
605 init_mm.end_data = (unsigned long) _edata;
606 init_mm.brk = klimit;
608 irqstack_early_init();
609 emergency_stack_init();
613 /* set up the bootmem stuff with available memory */
617 #ifdef CONFIG_DUMMY_CONSOLE
618 conswitchp = &dummy_con;
623 /* Use the default idle loop if the platform hasn't provided one. */
624 if (NULL == ppc_md.idle_loop) {
625 ppc_md.idle_loop = default_idle;
626 printk(KERN_INFO "Using default idle loop\n");
630 ppc64_boot_msg(0x15, "Setup Done");
634 /* ToDo: do something useful if ppc_md is not yet setup. */
635 #define PPC64_LINUX_FUNCTION 0x0f000000
636 #define PPC64_IPL_MESSAGE 0xc0000000
637 #define PPC64_TERM_MESSAGE 0xb0000000
639 static void ppc64_do_msg(unsigned int src, const char *msg)
641 if (ppc_md.progress) {
644 sprintf(buf, "%08X\n", src);
645 ppc_md.progress(buf, 0);
646 snprintf(buf, 128, "%s", msg);
647 ppc_md.progress(buf, 0);
651 /* Print a boot progress message. */
652 void ppc64_boot_msg(unsigned int src, const char *msg)
654 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
655 printk("[boot]%04x %s\n", src, msg);
658 /* Print a termination message (print only -- does not stop the kernel) */
659 void ppc64_terminate_msg(unsigned int src, const char *msg)
661 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
662 printk("[terminate]%04x %s\n", src, msg);
665 int check_legacy_ioport(unsigned long base_port)
667 if (ppc_md.check_legacy_ioport == NULL)
669 return ppc_md.check_legacy_ioport(base_port);
671 EXPORT_SYMBOL(check_legacy_ioport);