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/platform_device.h>
22 #include <linux/ide.h>
23 #include <linux/seq_file.h>
24 #include <linux/ioport.h>
25 #include <linux/console.h>
26 #include <linux/utsname.h>
27 #include <linux/tty.h>
28 #include <linux/root_dev.h>
29 #include <linux/notifier.h>
30 #include <linux/cpu.h>
31 #include <linux/unistd.h>
32 #include <linux/serial.h>
33 #include <linux/serial_8250.h>
36 #include <asm/processor.h>
37 #include <asm/vdso_datapage.h>
38 #include <asm/pgtable.h>
41 #include <asm/machdep.h>
43 #include <asm/cputable.h>
44 #include <asm/sections.h>
45 #include <asm/btext.h>
46 #include <asm/nvram.h>
47 #include <asm/setup.h>
48 #include <asm/system.h>
50 #include <asm/iommu.h>
51 #include <asm/serial.h>
52 #include <asm/cache.h>
64 #define DBG(fmt...) udbg_printf(fmt)
69 #ifdef CONFIG_PPC_MULTIPLATFORM
71 EXPORT_SYMBOL(_machine);
74 unsigned long klimit = (unsigned long) _end;
77 * This still seems to be needed... -- paulus
79 struct screen_info screen_info = {
82 .orig_video_cols = 80,
83 .orig_video_lines = 25,
84 .orig_video_isVGA = 1,
85 .orig_video_points = 16
89 /* XXX should go elsewhere eventually */
90 int ppc_do_canonicalize_irqs;
91 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
94 /* also used by kexec */
95 void machine_shutdown(void)
97 if (ppc_md.machine_shutdown)
98 ppc_md.machine_shutdown();
101 void machine_restart(char *cmd)
109 printk(KERN_EMERG "System Halted, OK to turn off power\n");
114 void machine_power_off(void)
117 if (ppc_md.power_off)
122 printk(KERN_EMERG "System Halted, OK to turn off power\n");
126 /* Used by the G5 thermal driver */
127 EXPORT_SYMBOL_GPL(machine_power_off);
129 void (*pm_power_off)(void) = machine_power_off;
130 EXPORT_SYMBOL_GPL(pm_power_off);
132 void machine_halt(void)
140 printk(KERN_EMERG "System Halted, OK to turn off power\n");
147 extern u32 cpu_temp(unsigned long cpu);
148 extern u32 cpu_temp_both(unsigned long cpu);
149 #endif /* CONFIG_TAU */
152 DEFINE_PER_CPU(unsigned int, pvr);
155 static int show_cpuinfo(struct seq_file *m, void *v)
157 unsigned long cpu_id = (unsigned long)v - 1;
162 if (cpu_id == NR_CPUS) {
163 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
164 unsigned long bogosum = 0;
166 for (i = 0; i < NR_CPUS; ++i)
168 bogosum += loops_per_jiffy;
169 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
170 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
171 #endif /* CONFIG_SMP && CONFIG_PPC32 */
172 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
174 if (ppc_md.show_cpuinfo != NULL)
175 ppc_md.show_cpuinfo(m);
180 /* We only show online cpus: disable preempt (overzealous, I
181 * knew) to prevent cpu going down. */
183 if (!cpu_online(cpu_id)) {
189 pvr = per_cpu(pvr, cpu_id);
191 pvr = mfspr(SPRN_PVR);
193 maj = (pvr >> 8) & 0xFF;
196 seq_printf(m, "processor\t: %lu\n", cpu_id);
197 seq_printf(m, "cpu\t\t: ");
199 if (cur_cpu_spec->pvr_mask)
200 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
202 seq_printf(m, "unknown (%08x)", pvr);
204 #ifdef CONFIG_ALTIVEC
205 if (cpu_has_feature(CPU_FTR_ALTIVEC))
206 seq_printf(m, ", altivec supported");
207 #endif /* CONFIG_ALTIVEC */
212 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
213 #ifdef CONFIG_TAU_AVERAGE
214 /* more straightforward, but potentially misleading */
215 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
218 /* show the actual temp sensor range */
220 temp = cpu_temp_both(cpu_id);
221 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
222 temp & 0xff, temp >> 16);
225 #endif /* CONFIG_TAU */
228 * Assume here that all clock rates are the same in a
229 * smp system. -- Cort
232 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
233 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
235 if (ppc_md.show_percpuinfo != NULL)
236 ppc_md.show_percpuinfo(m, cpu_id);
238 /* If we are a Freescale core do a simple check so
239 * we dont have to keep adding cases in the future */
240 if (PVR_VER(pvr) & 0x8000) {
244 switch (PVR_VER(pvr)) {
245 case 0x0020: /* 403 family */
246 maj = PVR_MAJ(pvr) + 1;
249 case 0x1008: /* 740P/750P ?? */
250 maj = ((pvr >> 8) & 0xFF) - 1;
254 maj = (pvr >> 8) & 0xFF;
260 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
261 maj, min, PVR_VER(pvr), PVR_REV(pvr));
264 seq_printf(m, "bogomips\t: %lu.%02lu\n",
265 loops_per_jiffy / (500000/HZ),
266 (loops_per_jiffy / (5000/HZ)) % 100);
277 static void *c_start(struct seq_file *m, loff_t *pos)
279 unsigned long i = *pos;
281 return i <= NR_CPUS ? (void *)(i + 1) : NULL;
284 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
287 return c_start(m, pos);
290 static void c_stop(struct seq_file *m, void *v)
294 struct seq_operations cpuinfo_op = {
298 .show = show_cpuinfo,
301 void __init check_for_initrd(void)
303 #ifdef CONFIG_BLK_DEV_INITRD
306 DBG(" -> check_for_initrd()\n");
309 prop = (unsigned long *)get_property(of_chosen,
310 "linux,initrd-start", NULL);
312 initrd_start = (unsigned long)__va(*prop);
313 prop = (unsigned long *)get_property(of_chosen,
314 "linux,initrd-end", NULL);
316 initrd_end = (unsigned long)__va(*prop);
317 initrd_below_start_ok = 1;
323 /* If we were passed an initrd, set the ROOT_DEV properly if the values
324 * look sensible. If not, clear initrd reference.
326 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
327 initrd_end > initrd_start)
328 ROOT_DEV = Root_RAM0;
330 initrd_start = initrd_end = 0;
333 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
335 DBG(" <- check_for_initrd()\n");
336 #endif /* CONFIG_BLK_DEV_INITRD */
342 * setup_cpu_maps - initialize the following cpu maps:
347 * Having the possible map set up early allows us to restrict allocations
348 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
350 * We do not initialize the online map here; cpus set their own bits in
351 * cpu_online_map as they come up.
353 * This function is valid only for Open Firmware systems. finish_device_tree
354 * must be called before using this.
356 * While we're here, we may as well set the "physical" cpu ids in the paca.
358 void __init smp_setup_cpu_maps(void)
360 struct device_node *dn = NULL;
364 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
366 int j, len = sizeof(u32), nthreads = 1;
368 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
371 nthreads = len / sizeof(int);
373 intserv = (int *) get_property(dn, "reg", NULL);
375 intserv = &cpu; /* assume logical == phys */
378 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
379 cpu_set(cpu, cpu_present_map);
380 set_hard_smp_processor_id(cpu, intserv[j]);
382 if (intserv[j] == boot_cpuid_phys)
384 cpu_set(cpu, cpu_possible_map);
389 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
390 * boot cpu is logical 0.
392 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
394 tmp = get_hard_smp_processor_id(0);
395 set_hard_smp_processor_id(0, boot_cpuid_phys);
396 set_hard_smp_processor_id(swap_cpuid, tmp);
401 * On pSeries LPAR, we need to know how many cpus
402 * could possibly be added to this partition.
404 if (_machine == PLATFORM_PSERIES_LPAR &&
405 (dn = of_find_node_by_path("/rtas"))) {
406 int num_addr_cell, num_size_cell, maxcpus;
409 num_addr_cell = prom_n_addr_cells(dn);
410 num_size_cell = prom_n_size_cells(dn);
412 ireg = (unsigned int *)
413 get_property(dn, "ibm,lrdr-capacity", NULL);
418 maxcpus = ireg[num_addr_cell + num_size_cell];
420 /* Double maxcpus for processors which have SMT capability */
421 if (cpu_has_feature(CPU_FTR_SMT))
424 if (maxcpus > NR_CPUS) {
426 "Partition configured for %d cpus, "
427 "operating system maximum is %d.\n",
431 printk(KERN_INFO "Partition configured for %d cpus.\n",
434 for (cpu = 0; cpu < maxcpus; cpu++)
435 cpu_set(cpu, cpu_possible_map);
441 * Do the sibling map; assume only two threads per processor.
444 cpu_set(cpu, cpu_sibling_map[cpu]);
445 if (cpu_has_feature(CPU_FTR_SMT))
446 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
449 vdso_data->processorCount = num_present_cpus();
450 #endif /* CONFIG_PPC64 */
452 #endif /* CONFIG_SMP */
455 static int __init early_xmon(char *p)
457 /* ensure xmon is enabled */
459 if (strncmp(p, "on", 2) == 0)
461 if (strncmp(p, "off", 3) == 0)
463 if (strncmp(p, "early", 5) != 0)
471 early_param("xmon", early_xmon);
474 static __init int add_pcspkr(void)
476 struct device_node *np;
477 struct platform_device *pd;
480 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
485 pd = platform_device_alloc("pcspkr", -1);
489 ret = platform_device_add(pd);
491 platform_device_put(pd);
495 device_initcall(add_pcspkr);