2 * Common boot and setup code for both 32-bit and 64-bit.
3 * Extracted from arch/powerpc/kernel/setup_64.c.
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/platform_device.h>
25 #include <linux/ide.h>
26 #include <linux/seq_file.h>
27 #include <linux/ioport.h>
28 #include <linux/console.h>
29 #include <linux/utsname.h>
30 #include <linux/tty.h>
31 #include <linux/root_dev.h>
32 #include <linux/notifier.h>
33 #include <linux/cpu.h>
34 #include <linux/unistd.h>
35 #include <linux/serial.h>
36 #include <linux/serial_8250.h>
39 #include <asm/processor.h>
40 #include <asm/vdso_datapage.h>
41 #include <asm/pgtable.h>
44 #include <asm/machdep.h>
46 #include <asm/cputable.h>
47 #include <asm/sections.h>
48 #include <asm/firmware.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>
66 #define DBG(fmt...) udbg_printf(fmt)
71 /* The main machine-dep calls structure
73 struct machdep_calls ppc_md;
74 EXPORT_SYMBOL(ppc_md);
75 struct machdep_calls *machine_id;
76 EXPORT_SYMBOL(machine_id);
78 unsigned long klimit = (unsigned long) _end;
81 * This still seems to be needed... -- paulus
83 struct screen_info screen_info = {
86 .orig_video_cols = 80,
87 .orig_video_lines = 25,
88 .orig_video_isVGA = 1,
89 .orig_video_points = 16
93 /* XXX should go elsewhere eventually */
94 int ppc_do_canonicalize_irqs;
95 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
98 /* also used by kexec */
99 void machine_shutdown(void)
101 if (ppc_md.machine_shutdown)
102 ppc_md.machine_shutdown();
105 void machine_restart(char *cmd)
113 printk(KERN_EMERG "System Halted, OK to turn off power\n");
118 void machine_power_off(void)
121 if (ppc_md.power_off)
126 printk(KERN_EMERG "System Halted, OK to turn off power\n");
130 /* Used by the G5 thermal driver */
131 EXPORT_SYMBOL_GPL(machine_power_off);
133 void (*pm_power_off)(void) = machine_power_off;
134 EXPORT_SYMBOL_GPL(pm_power_off);
136 void machine_halt(void)
144 printk(KERN_EMERG "System Halted, OK to turn off power\n");
151 extern u32 cpu_temp(unsigned long cpu);
152 extern u32 cpu_temp_both(unsigned long cpu);
153 #endif /* CONFIG_TAU */
156 DEFINE_PER_CPU(unsigned int, pvr);
159 static int show_cpuinfo(struct seq_file *m, void *v)
161 unsigned long cpu_id = (unsigned long)v - 1;
166 if (cpu_id == NR_CPUS) {
167 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
168 unsigned long bogosum = 0;
170 for_each_online_cpu(i)
171 bogosum += loops_per_jiffy;
172 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
173 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
174 #endif /* CONFIG_SMP && CONFIG_PPC32 */
175 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
177 seq_printf(m, "platform\t: %s\n", ppc_md.name);
178 if (ppc_md.show_cpuinfo != NULL)
179 ppc_md.show_cpuinfo(m);
184 /* We only show online cpus: disable preempt (overzealous, I
185 * knew) to prevent cpu going down. */
187 if (!cpu_online(cpu_id)) {
193 pvr = per_cpu(pvr, cpu_id);
195 pvr = mfspr(SPRN_PVR);
197 maj = (pvr >> 8) & 0xFF;
200 seq_printf(m, "processor\t: %lu\n", cpu_id);
201 seq_printf(m, "cpu\t\t: ");
203 if (cur_cpu_spec->pvr_mask)
204 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
206 seq_printf(m, "unknown (%08x)", pvr);
208 #ifdef CONFIG_ALTIVEC
209 if (cpu_has_feature(CPU_FTR_ALTIVEC))
210 seq_printf(m, ", altivec supported");
211 #endif /* CONFIG_ALTIVEC */
216 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
217 #ifdef CONFIG_TAU_AVERAGE
218 /* more straightforward, but potentially misleading */
219 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
222 /* show the actual temp sensor range */
224 temp = cpu_temp_both(cpu_id);
225 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
226 temp & 0xff, temp >> 16);
229 #endif /* CONFIG_TAU */
232 * Assume here that all clock rates are the same in a
233 * smp system. -- Cort
236 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
237 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
239 if (ppc_md.show_percpuinfo != NULL)
240 ppc_md.show_percpuinfo(m, cpu_id);
242 /* If we are a Freescale core do a simple check so
243 * we dont have to keep adding cases in the future */
244 if (PVR_VER(pvr) & 0x8000) {
248 switch (PVR_VER(pvr)) {
249 case 0x0020: /* 403 family */
250 maj = PVR_MAJ(pvr) + 1;
253 case 0x1008: /* 740P/750P ?? */
254 maj = ((pvr >> 8) & 0xFF) - 1;
258 maj = (pvr >> 8) & 0xFF;
264 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
265 maj, min, PVR_VER(pvr), PVR_REV(pvr));
268 seq_printf(m, "bogomips\t: %lu.%02lu\n",
269 loops_per_jiffy / (500000/HZ),
270 (loops_per_jiffy / (5000/HZ)) % 100);
281 static void *c_start(struct seq_file *m, loff_t *pos)
283 unsigned long i = *pos;
285 return i <= NR_CPUS ? (void *)(i + 1) : NULL;
288 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
291 return c_start(m, pos);
294 static void c_stop(struct seq_file *m, void *v)
298 struct seq_operations cpuinfo_op = {
302 .show = show_cpuinfo,
305 void __init check_for_initrd(void)
307 #ifdef CONFIG_BLK_DEV_INITRD
310 DBG(" -> check_for_initrd()\n");
313 prop = (unsigned long *)get_property(of_chosen,
314 "linux,initrd-start", NULL);
316 initrd_start = (unsigned long)__va(*prop);
317 prop = (unsigned long *)get_property(of_chosen,
318 "linux,initrd-end", NULL);
320 initrd_end = (unsigned long)__va(*prop);
321 initrd_below_start_ok = 1;
327 /* If we were passed an initrd, set the ROOT_DEV properly if the values
328 * look sensible. If not, clear initrd reference.
330 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
331 initrd_end > initrd_start)
332 ROOT_DEV = Root_RAM0;
334 initrd_start = initrd_end = 0;
337 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
339 DBG(" <- check_for_initrd()\n");
340 #endif /* CONFIG_BLK_DEV_INITRD */
346 * setup_cpu_maps - initialize the following cpu maps:
351 * Having the possible map set up early allows us to restrict allocations
352 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
354 * We do not initialize the online map here; cpus set their own bits in
355 * cpu_online_map as they come up.
357 * This function is valid only for Open Firmware systems. finish_device_tree
358 * must be called before using this.
360 * While we're here, we may as well set the "physical" cpu ids in the paca.
362 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
364 void __init smp_setup_cpu_maps(void)
366 struct device_node *dn = NULL;
369 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
371 int j, len = sizeof(u32), nthreads = 1;
373 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
376 nthreads = len / sizeof(int);
378 intserv = (int *) get_property(dn, "reg", NULL);
380 intserv = &cpu; /* assume logical == phys */
383 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
384 cpu_set(cpu, cpu_present_map);
385 set_hard_smp_processor_id(cpu, intserv[j]);
386 cpu_set(cpu, cpu_possible_map);
393 * On pSeries LPAR, we need to know how many cpus
394 * could possibly be added to this partition.
396 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
397 (dn = of_find_node_by_path("/rtas"))) {
398 int num_addr_cell, num_size_cell, maxcpus;
401 num_addr_cell = prom_n_addr_cells(dn);
402 num_size_cell = prom_n_size_cells(dn);
404 ireg = (unsigned int *)
405 get_property(dn, "ibm,lrdr-capacity", NULL);
410 maxcpus = ireg[num_addr_cell + num_size_cell];
412 /* Double maxcpus for processors which have SMT capability */
413 if (cpu_has_feature(CPU_FTR_SMT))
416 if (maxcpus > NR_CPUS) {
418 "Partition configured for %d cpus, "
419 "operating system maximum is %d.\n",
423 printk(KERN_INFO "Partition configured for %d cpus.\n",
426 for (cpu = 0; cpu < maxcpus; cpu++)
427 cpu_set(cpu, cpu_possible_map);
433 * Do the sibling map; assume only two threads per processor.
435 for_each_possible_cpu(cpu) {
436 cpu_set(cpu, cpu_sibling_map[cpu]);
437 if (cpu_has_feature(CPU_FTR_SMT))
438 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
441 vdso_data->processorCount = num_present_cpus();
442 #endif /* CONFIG_PPC64 */
444 #endif /* CONFIG_SMP */
446 int __initdata do_early_xmon;
448 static int __init early_xmon(char *p)
450 /* ensure xmon is enabled */
452 if (strncmp(p, "on", 2) == 0)
454 if (strncmp(p, "off", 3) == 0)
456 if (strncmp(p, "early", 5) != 0)
464 early_param("xmon", early_xmon);
467 static __init int add_pcspkr(void)
469 struct device_node *np;
470 struct platform_device *pd;
473 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
478 pd = platform_device_alloc("pcspkr", -1);
482 ret = platform_device_add(pd);
484 platform_device_put(pd);
488 device_initcall(add_pcspkr);
490 void probe_machine(void)
492 extern struct machdep_calls __machine_desc_start;
493 extern struct machdep_calls __machine_desc_end;
496 * Iterate all ppc_md structures until we find the proper
497 * one for the current machine type
499 DBG("Probing machine type ...\n");
501 for (machine_id = &__machine_desc_start;
502 machine_id < &__machine_desc_end;
504 DBG(" %s ...", machine_id->name);
505 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
506 if (ppc_md.probe()) {
512 /* What can we do if we didn't find ? */
513 if (machine_id >= &__machine_desc_end) {
514 DBG("No suitable machine found !\n");
518 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
521 int check_legacy_ioport(unsigned long base_port)
523 if (ppc_md.check_legacy_ioport == NULL)
525 return ppc_md.check_legacy_ioport(base_port);
527 EXPORT_SYMBOL(check_legacy_ioport);
529 static int ppc_panic_event(struct notifier_block *this,
530 unsigned long event, void *ptr)
532 ppc_md.panic(ptr); /* May not return */
536 static struct notifier_block ppc_panic_block = {
537 .notifier_call = ppc_panic_event,
538 .priority = INT_MIN /* may not return; must be done last */
541 void __init setup_panic(void)
543 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);