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.
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/sched.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/reboot.h>
19 #include <linux/delay.h>
20 #include <linux/initrd.h>
21 #include <linux/ide.h>
22 #include <linux/seq_file.h>
23 #include <linux/ioport.h>
24 #include <linux/console.h>
25 #include <linux/utsname.h>
26 #include <linux/tty.h>
27 #include <linux/root_dev.h>
28 #include <linux/notifier.h>
29 #include <linux/cpu.h>
30 #include <linux/unistd.h>
31 #include <linux/serial.h>
32 #include <linux/serial_8250.h>
35 #include <asm/processor.h>
36 #include <asm/pgtable.h>
39 #include <asm/machdep.h>
41 #include <asm/cputable.h>
42 #include <asm/sections.h>
43 #include <asm/btext.h>
44 #include <asm/nvram.h>
45 #include <asm/setup.h>
46 #include <asm/system.h>
48 #include <asm/iommu.h>
49 #include <asm/serial.h>
50 #include <asm/cache.h>
61 #define DBG(fmt...) udbg_printf(fmt)
67 * This still seems to be needed... -- paulus
69 struct screen_info screen_info = {
72 .orig_video_cols = 80,
73 .orig_video_lines = 25,
74 .orig_video_isVGA = 1,
75 .orig_video_points = 16
79 /* XXX should go elsewhere eventually */
80 int ppc_do_canonicalize_irqs;
81 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
84 /* also used by kexec */
85 void machine_shutdown(void)
87 if (ppc_md.nvram_sync)
91 void machine_restart(char *cmd)
98 printk(KERN_EMERG "System Halted, OK to turn off power\n");
103 void machine_power_off(void)
110 printk(KERN_EMERG "System Halted, OK to turn off power\n");
114 /* Used by the G5 thermal driver */
115 EXPORT_SYMBOL_GPL(machine_power_off);
117 void (*pm_power_off)(void) = machine_power_off;
118 EXPORT_SYMBOL_GPL(pm_power_off);
120 void machine_halt(void)
127 printk(KERN_EMERG "System Halted, OK to turn off power\n");
134 extern u32 cpu_temp(unsigned long cpu);
135 extern u32 cpu_temp_both(unsigned long cpu);
136 #endif /* CONFIG_TAU */
139 DEFINE_PER_CPU(unsigned int, pvr);
142 static int show_cpuinfo(struct seq_file *m, void *v)
144 unsigned long cpu_id = (unsigned long)v - 1;
149 if (cpu_id == NR_CPUS) {
150 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
151 unsigned long bogosum = 0;
153 for (i = 0; i < NR_CPUS; ++i)
155 bogosum += loops_per_jiffy;
156 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
157 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
158 #endif /* CONFIG_SMP && CONFIG_PPC32 */
159 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
161 if (ppc_md.show_cpuinfo != NULL)
162 ppc_md.show_cpuinfo(m);
167 /* We only show online cpus: disable preempt (overzealous, I
168 * knew) to prevent cpu going down. */
170 if (!cpu_online(cpu_id)) {
176 pvr = per_cpu(pvr, cpu_id);
178 pvr = mfspr(SPRN_PVR);
180 maj = (pvr >> 8) & 0xFF;
183 seq_printf(m, "processor\t: %lu\n", cpu_id);
184 seq_printf(m, "cpu\t\t: ");
186 if (cur_cpu_spec->pvr_mask)
187 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
189 seq_printf(m, "unknown (%08x)", pvr);
191 #ifdef CONFIG_ALTIVEC
192 if (cpu_has_feature(CPU_FTR_ALTIVEC))
193 seq_printf(m, ", altivec supported");
194 #endif /* CONFIG_ALTIVEC */
199 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
200 #ifdef CONFIG_TAU_AVERAGE
201 /* more straightforward, but potentially misleading */
202 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
205 /* show the actual temp sensor range */
207 temp = cpu_temp_both(cpu_id);
208 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
209 temp & 0xff, temp >> 16);
212 #endif /* CONFIG_TAU */
215 * Assume here that all clock rates are the same in a
216 * smp system. -- Cort
219 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
220 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
222 if (ppc_md.show_percpuinfo != NULL)
223 ppc_md.show_percpuinfo(m, cpu_id);
225 /* If we are a Freescale core do a simple check so
226 * we dont have to keep adding cases in the future */
227 if (PVR_VER(pvr) & 0x8000) {
231 switch (PVR_VER(pvr)) {
232 case 0x0020: /* 403 family */
233 maj = PVR_MAJ(pvr) + 1;
236 case 0x1008: /* 740P/750P ?? */
237 maj = ((pvr >> 8) & 0xFF) - 1;
241 maj = (pvr >> 8) & 0xFF;
247 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
248 maj, min, PVR_VER(pvr), PVR_REV(pvr));
251 seq_printf(m, "bogomips\t: %lu.%02lu\n",
252 loops_per_jiffy / (500000/HZ),
253 (loops_per_jiffy / (5000/HZ)) % 100);
264 static void *c_start(struct seq_file *m, loff_t *pos)
266 unsigned long i = *pos;
268 return i <= NR_CPUS ? (void *)(i + 1) : NULL;
271 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
274 return c_start(m, pos);
277 static void c_stop(struct seq_file *m, void *v)
281 struct seq_operations cpuinfo_op = {
285 .show = show_cpuinfo,
288 #ifdef CONFIG_PPC_MULTIPLATFORM
289 static int __init set_preferred_console(void)
291 struct device_node *prom_stdout = NULL;
296 DBG(" -> set_preferred_console()\n");
298 /* The user has requested a console so this is already set up. */
299 if (strstr(saved_command_line, "console=")) {
300 DBG(" console was specified !\n");
305 DBG(" of_chosen is NULL !\n");
308 /* We are getting a weird phandle from OF ... */
309 /* ... So use the full path instead */
310 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
312 DBG(" no linux,stdout-path !\n");
315 prom_stdout = of_find_node_by_path(name);
317 DBG(" can't find stdout package %s !\n", name);
320 DBG("stdout is %s\n", prom_stdout->full_name);
322 name = (char *)get_property(prom_stdout, "name", NULL);
324 DBG(" stdout package has no name !\n");
327 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
331 #ifdef CONFIG_SERIAL_8250_CONSOLE
332 else if (strcmp(name, "serial") == 0) {
334 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
350 /* We dont recognise the serial port */
355 #endif /* CONFIG_SERIAL_8250_CONSOLE */
356 #ifdef CONFIG_PPC_PSERIES
357 else if (strcmp(name, "vty") == 0) {
358 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
359 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
361 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
362 /* Host Virtual Serial Interface */
373 of_node_put(prom_stdout);
374 DBG("Found hvsi console at offset %d\n", offset);
375 return add_preferred_console("hvsi", offset, NULL);
377 /* pSeries LPAR virtual console */
378 of_node_put(prom_stdout);
379 DBG("Found hvc console\n");
380 return add_preferred_console("hvc", 0, NULL);
383 #endif /* CONFIG_PPC_PSERIES */
384 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
385 else if (strcmp(name, "ch-a") == 0)
387 else if (strcmp(name, "ch-b") == 0)
389 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
392 of_node_put(prom_stdout);
394 DBG("Found serial console at ttyS%d\n", offset);
397 static char __initdata opt[16];
398 sprintf(opt, "%d", *spd);
399 return add_preferred_console("ttyS", offset, opt);
401 return add_preferred_console("ttyS", offset, NULL);
404 DBG("No preferred console found !\n");
405 of_node_put(prom_stdout);
408 console_initcall(set_preferred_console);
409 #endif /* CONFIG_PPC_MULTIPLATFORM */
411 void __init check_for_initrd(void)
413 #ifdef CONFIG_BLK_DEV_INITRD
416 DBG(" -> check_for_initrd()\n");
419 prop = (unsigned long *)get_property(of_chosen,
420 "linux,initrd-start", NULL);
422 initrd_start = (unsigned long)__va(*prop);
423 prop = (unsigned long *)get_property(of_chosen,
424 "linux,initrd-end", NULL);
426 initrd_end = (unsigned long)__va(*prop);
427 initrd_below_start_ok = 1;
433 /* If we were passed an initrd, set the ROOT_DEV properly if the values
434 * look sensible. If not, clear initrd reference.
436 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
437 initrd_end > initrd_start)
438 ROOT_DEV = Root_RAM0;
440 printk("Bogus initrd %08lx %08lx\n", initrd_start, initrd_end);
441 initrd_start = initrd_end = 0;
445 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
447 DBG(" <- check_for_initrd()\n");
448 #endif /* CONFIG_BLK_DEV_INITRD */
454 * setup_cpu_maps - initialize the following cpu maps:
459 * Having the possible map set up early allows us to restrict allocations
460 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
462 * We do not initialize the online map here; cpus set their own bits in
463 * cpu_online_map as they come up.
465 * This function is valid only for Open Firmware systems. finish_device_tree
466 * must be called before using this.
468 * While we're here, we may as well set the "physical" cpu ids in the paca.
470 void __init smp_setup_cpu_maps(void)
472 struct device_node *dn = NULL;
476 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
478 int j, len = sizeof(u32), nthreads = 1;
480 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
483 nthreads = len / sizeof(int);
485 intserv = (int *) get_property(dn, "reg", NULL);
487 intserv = &cpu; /* assume logical == phys */
490 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
491 cpu_set(cpu, cpu_present_map);
492 set_hard_smp_processor_id(cpu, intserv[j]);
494 if (intserv[j] == boot_cpuid_phys)
496 cpu_set(cpu, cpu_possible_map);
501 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
502 * boot cpu is logical 0.
504 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
506 tmp = get_hard_smp_processor_id(0);
507 set_hard_smp_processor_id(0, boot_cpuid_phys);
508 set_hard_smp_processor_id(swap_cpuid, tmp);
513 * On pSeries LPAR, we need to know how many cpus
514 * could possibly be added to this partition.
516 if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
517 (dn = of_find_node_by_path("/rtas"))) {
518 int num_addr_cell, num_size_cell, maxcpus;
521 num_addr_cell = prom_n_addr_cells(dn);
522 num_size_cell = prom_n_size_cells(dn);
524 ireg = (unsigned int *)
525 get_property(dn, "ibm,lrdr-capacity", NULL);
530 maxcpus = ireg[num_addr_cell + num_size_cell];
532 /* Double maxcpus for processors which have SMT capability */
533 if (cpu_has_feature(CPU_FTR_SMT))
536 if (maxcpus > NR_CPUS) {
538 "Partition configured for %d cpus, "
539 "operating system maximum is %d.\n",
543 printk(KERN_INFO "Partition configured for %d cpus.\n",
546 for (cpu = 0; cpu < maxcpus; cpu++)
547 cpu_set(cpu, cpu_possible_map);
553 * Do the sibling map; assume only two threads per processor.
556 cpu_set(cpu, cpu_sibling_map[cpu]);
557 if (cpu_has_feature(CPU_FTR_SMT))
558 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
561 systemcfg->processorCount = num_present_cpus();
562 #endif /* CONFIG_PPC64 */
564 #endif /* CONFIG_SMP */
567 static int __init early_xmon(char *p)
569 /* ensure xmon is enabled */
571 if (strncmp(p, "on", 2) == 0)
573 if (strncmp(p, "off", 3) == 0)
575 if (strncmp(p, "early", 5) != 0)
583 early_param("xmon", early_xmon);