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/systemcfg.h>
37 #include <asm/pgtable.h>
40 #include <asm/machdep.h>
42 #include <asm/cputable.h>
43 #include <asm/sections.h>
44 #include <asm/btext.h>
45 #include <asm/nvram.h>
46 #include <asm/setup.h>
47 #include <asm/system.h>
49 #include <asm/iommu.h>
50 #include <asm/serial.h>
51 #include <asm/cache.h>
62 #define DBG(fmt...) udbg_printf(fmt)
67 #ifdef CONFIG_PPC_MULTIPLATFORM
69 EXPORT_SYMBOL(_machine);
73 * This still seems to be needed... -- paulus
75 struct screen_info screen_info = {
78 .orig_video_cols = 80,
79 .orig_video_lines = 25,
80 .orig_video_isVGA = 1,
81 .orig_video_points = 16
85 /* XXX should go elsewhere eventually */
86 int ppc_do_canonicalize_irqs;
87 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
90 /* also used by kexec */
91 void machine_shutdown(void)
93 if (ppc_md.nvram_sync)
97 void machine_restart(char *cmd)
104 printk(KERN_EMERG "System Halted, OK to turn off power\n");
109 void machine_power_off(void)
116 printk(KERN_EMERG "System Halted, OK to turn off power\n");
120 /* Used by the G5 thermal driver */
121 EXPORT_SYMBOL_GPL(machine_power_off);
123 void (*pm_power_off)(void) = machine_power_off;
124 EXPORT_SYMBOL_GPL(pm_power_off);
126 void machine_halt(void)
133 printk(KERN_EMERG "System Halted, OK to turn off power\n");
140 extern u32 cpu_temp(unsigned long cpu);
141 extern u32 cpu_temp_both(unsigned long cpu);
142 #endif /* CONFIG_TAU */
145 DEFINE_PER_CPU(unsigned int, pvr);
148 static int show_cpuinfo(struct seq_file *m, void *v)
150 unsigned long cpu_id = (unsigned long)v - 1;
155 if (cpu_id == NR_CPUS) {
156 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
157 unsigned long bogosum = 0;
159 for (i = 0; i < NR_CPUS; ++i)
161 bogosum += loops_per_jiffy;
162 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
163 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
164 #endif /* CONFIG_SMP && CONFIG_PPC32 */
165 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
167 if (ppc_md.show_cpuinfo != NULL)
168 ppc_md.show_cpuinfo(m);
173 /* We only show online cpus: disable preempt (overzealous, I
174 * knew) to prevent cpu going down. */
176 if (!cpu_online(cpu_id)) {
182 pvr = per_cpu(pvr, cpu_id);
184 pvr = mfspr(SPRN_PVR);
186 maj = (pvr >> 8) & 0xFF;
189 seq_printf(m, "processor\t: %lu\n", cpu_id);
190 seq_printf(m, "cpu\t\t: ");
192 if (cur_cpu_spec->pvr_mask)
193 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
195 seq_printf(m, "unknown (%08x)", pvr);
197 #ifdef CONFIG_ALTIVEC
198 if (cpu_has_feature(CPU_FTR_ALTIVEC))
199 seq_printf(m, ", altivec supported");
200 #endif /* CONFIG_ALTIVEC */
205 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
206 #ifdef CONFIG_TAU_AVERAGE
207 /* more straightforward, but potentially misleading */
208 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
211 /* show the actual temp sensor range */
213 temp = cpu_temp_both(cpu_id);
214 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
215 temp & 0xff, temp >> 16);
218 #endif /* CONFIG_TAU */
221 * Assume here that all clock rates are the same in a
222 * smp system. -- Cort
225 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
226 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
228 if (ppc_md.show_percpuinfo != NULL)
229 ppc_md.show_percpuinfo(m, cpu_id);
231 /* If we are a Freescale core do a simple check so
232 * we dont have to keep adding cases in the future */
233 if (PVR_VER(pvr) & 0x8000) {
237 switch (PVR_VER(pvr)) {
238 case 0x0020: /* 403 family */
239 maj = PVR_MAJ(pvr) + 1;
242 case 0x1008: /* 740P/750P ?? */
243 maj = ((pvr >> 8) & 0xFF) - 1;
247 maj = (pvr >> 8) & 0xFF;
253 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
254 maj, min, PVR_VER(pvr), PVR_REV(pvr));
257 seq_printf(m, "bogomips\t: %lu.%02lu\n",
258 loops_per_jiffy / (500000/HZ),
259 (loops_per_jiffy / (5000/HZ)) % 100);
270 static void *c_start(struct seq_file *m, loff_t *pos)
272 unsigned long i = *pos;
274 return i <= NR_CPUS ? (void *)(i + 1) : NULL;
277 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
280 return c_start(m, pos);
283 static void c_stop(struct seq_file *m, void *v)
287 struct seq_operations cpuinfo_op = {
291 .show = show_cpuinfo,
294 #ifdef CONFIG_PPC_MULTIPLATFORM
295 static int __init set_preferred_console(void)
297 struct device_node *prom_stdout = NULL;
302 DBG(" -> set_preferred_console()\n");
304 /* The user has requested a console so this is already set up. */
305 if (strstr(saved_command_line, "console=")) {
306 DBG(" console was specified !\n");
311 DBG(" of_chosen is NULL !\n");
314 /* We are getting a weird phandle from OF ... */
315 /* ... So use the full path instead */
316 name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
318 DBG(" no linux,stdout-path !\n");
321 prom_stdout = of_find_node_by_path(name);
323 DBG(" can't find stdout package %s !\n", name);
326 DBG("stdout is %s\n", prom_stdout->full_name);
328 name = (char *)get_property(prom_stdout, "name", NULL);
330 DBG(" stdout package has no name !\n");
333 spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
337 #ifdef CONFIG_SERIAL_8250_CONSOLE
338 else if (strcmp(name, "serial") == 0) {
340 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
356 /* We dont recognise the serial port */
361 #endif /* CONFIG_SERIAL_8250_CONSOLE */
362 #ifdef CONFIG_PPC_PSERIES
363 else if (strcmp(name, "vty") == 0) {
364 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
365 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
367 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
368 /* Host Virtual Serial Interface */
379 of_node_put(prom_stdout);
380 DBG("Found hvsi console at offset %d\n", offset);
381 return add_preferred_console("hvsi", offset, NULL);
383 /* pSeries LPAR virtual console */
384 of_node_put(prom_stdout);
385 DBG("Found hvc console\n");
386 return add_preferred_console("hvc", 0, NULL);
389 #endif /* CONFIG_PPC_PSERIES */
390 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
391 else if (strcmp(name, "ch-a") == 0)
393 else if (strcmp(name, "ch-b") == 0)
395 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
398 of_node_put(prom_stdout);
400 DBG("Found serial console at ttyS%d\n", offset);
403 static char __initdata opt[16];
404 sprintf(opt, "%d", *spd);
405 return add_preferred_console("ttyS", offset, opt);
407 return add_preferred_console("ttyS", offset, NULL);
410 DBG("No preferred console found !\n");
411 of_node_put(prom_stdout);
414 console_initcall(set_preferred_console);
415 #endif /* CONFIG_PPC_MULTIPLATFORM */
417 void __init check_for_initrd(void)
419 #ifdef CONFIG_BLK_DEV_INITRD
422 DBG(" -> check_for_initrd()\n");
425 prop = (unsigned long *)get_property(of_chosen,
426 "linux,initrd-start", NULL);
428 initrd_start = (unsigned long)__va(*prop);
429 prop = (unsigned long *)get_property(of_chosen,
430 "linux,initrd-end", NULL);
432 initrd_end = (unsigned long)__va(*prop);
433 initrd_below_start_ok = 1;
439 /* If we were passed an initrd, set the ROOT_DEV properly if the values
440 * look sensible. If not, clear initrd reference.
442 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
443 initrd_end > initrd_start)
444 ROOT_DEV = Root_RAM0;
446 printk("Bogus initrd %08lx %08lx\n", initrd_start, initrd_end);
447 initrd_start = initrd_end = 0;
451 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
453 DBG(" <- check_for_initrd()\n");
454 #endif /* CONFIG_BLK_DEV_INITRD */
460 * setup_cpu_maps - initialize the following cpu maps:
465 * Having the possible map set up early allows us to restrict allocations
466 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
468 * We do not initialize the online map here; cpus set their own bits in
469 * cpu_online_map as they come up.
471 * This function is valid only for Open Firmware systems. finish_device_tree
472 * must be called before using this.
474 * While we're here, we may as well set the "physical" cpu ids in the paca.
476 void __init smp_setup_cpu_maps(void)
478 struct device_node *dn = NULL;
482 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
484 int j, len = sizeof(u32), nthreads = 1;
486 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
489 nthreads = len / sizeof(int);
491 intserv = (int *) get_property(dn, "reg", NULL);
493 intserv = &cpu; /* assume logical == phys */
496 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
497 cpu_set(cpu, cpu_present_map);
498 set_hard_smp_processor_id(cpu, intserv[j]);
500 if (intserv[j] == boot_cpuid_phys)
502 cpu_set(cpu, cpu_possible_map);
507 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
508 * boot cpu is logical 0.
510 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
512 tmp = get_hard_smp_processor_id(0);
513 set_hard_smp_processor_id(0, boot_cpuid_phys);
514 set_hard_smp_processor_id(swap_cpuid, tmp);
519 * On pSeries LPAR, we need to know how many cpus
520 * could possibly be added to this partition.
522 if (_machine == PLATFORM_PSERIES_LPAR &&
523 (dn = of_find_node_by_path("/rtas"))) {
524 int num_addr_cell, num_size_cell, maxcpus;
527 num_addr_cell = prom_n_addr_cells(dn);
528 num_size_cell = prom_n_size_cells(dn);
530 ireg = (unsigned int *)
531 get_property(dn, "ibm,lrdr-capacity", NULL);
536 maxcpus = ireg[num_addr_cell + num_size_cell];
538 /* Double maxcpus for processors which have SMT capability */
539 if (cpu_has_feature(CPU_FTR_SMT))
542 if (maxcpus > NR_CPUS) {
544 "Partition configured for %d cpus, "
545 "operating system maximum is %d.\n",
549 printk(KERN_INFO "Partition configured for %d cpus.\n",
552 for (cpu = 0; cpu < maxcpus; cpu++)
553 cpu_set(cpu, cpu_possible_map);
559 * Do the sibling map; assume only two threads per processor.
562 cpu_set(cpu, cpu_sibling_map[cpu]);
563 if (cpu_has_feature(CPU_FTR_SMT))
564 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
567 _systemcfg->processorCount = num_present_cpus();
568 #endif /* CONFIG_PPC64 */
570 #endif /* CONFIG_SMP */
573 static int __init early_xmon(char *p)
575 /* ensure xmon is enabled */
577 if (strncmp(p, "on", 2) == 0)
579 if (strncmp(p, "off", 3) == 0)
581 if (strncmp(p, "early", 5) != 0)
589 early_param("xmon", early_xmon);