[PATCH] powerpc: Add a is_kernel_addr() macro
[linux-2.6.git] / arch / powerpc / kernel / setup-common.c
1 /*
2  * Common boot and setup code for both 32-bit and 64-bit.
3  * Extracted from arch/powerpc/kernel/setup_64.c.
4  *
5  * Copyright (C) 2001 PPC64 Team, IBM Corp
6  *
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.
11  */
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>
33 #include <asm/io.h>
34 #include <asm/prom.h>
35 #include <asm/processor.h>
36 #include <asm/vdso_datapage.h>
37 #include <asm/pgtable.h>
38 #include <asm/smp.h>
39 #include <asm/elf.h>
40 #include <asm/machdep.h>
41 #include <asm/time.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>
48 #include <asm/rtas.h>
49 #include <asm/iommu.h>
50 #include <asm/serial.h>
51 #include <asm/cache.h>
52 #include <asm/page.h>
53 #include <asm/mmu.h>
54 #include <asm/lmb.h>
55 #include <asm/xmon.h>
56
57 #include "setup.h"
58
59 #undef DEBUG
60
61 #ifdef DEBUG
62 #include <asm/udbg.h>
63 #define DBG(fmt...) udbg_printf(fmt)
64 #else
65 #define DBG(fmt...)
66 #endif
67
68 #ifdef CONFIG_PPC_MULTIPLATFORM
69 int _machine = 0;
70 EXPORT_SYMBOL(_machine);
71 #endif
72
73 unsigned long klimit = (unsigned long) _end;
74
75 /*
76  * This still seems to be needed... -- paulus
77  */ 
78 struct screen_info screen_info = {
79         .orig_x = 0,
80         .orig_y = 25,
81         .orig_video_cols = 80,
82         .orig_video_lines = 25,
83         .orig_video_isVGA = 1,
84         .orig_video_points = 16
85 };
86
87 #ifdef __DO_IRQ_CANON
88 /* XXX should go elsewhere eventually */
89 int ppc_do_canonicalize_irqs;
90 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
91 #endif
92
93 /* also used by kexec */
94 void machine_shutdown(void)
95 {
96         if (ppc_md.machine_shutdown)
97                 ppc_md.machine_shutdown();
98 }
99
100 void machine_restart(char *cmd)
101 {
102         machine_shutdown();
103         ppc_md.restart(cmd);
104 #ifdef CONFIG_SMP
105         smp_send_stop();
106 #endif
107         printk(KERN_EMERG "System Halted, OK to turn off power\n");
108         local_irq_disable();
109         while (1) ;
110 }
111
112 void machine_power_off(void)
113 {
114         machine_shutdown();
115         ppc_md.power_off();
116 #ifdef CONFIG_SMP
117         smp_send_stop();
118 #endif
119         printk(KERN_EMERG "System Halted, OK to turn off power\n");
120         local_irq_disable();
121         while (1) ;
122 }
123 /* Used by the G5 thermal driver */
124 EXPORT_SYMBOL_GPL(machine_power_off);
125
126 void (*pm_power_off)(void) = machine_power_off;
127 EXPORT_SYMBOL_GPL(pm_power_off);
128
129 void machine_halt(void)
130 {
131         machine_shutdown();
132         ppc_md.halt();
133 #ifdef CONFIG_SMP
134         smp_send_stop();
135 #endif
136         printk(KERN_EMERG "System Halted, OK to turn off power\n");
137         local_irq_disable();
138         while (1) ;
139 }
140
141
142 #ifdef CONFIG_TAU
143 extern u32 cpu_temp(unsigned long cpu);
144 extern u32 cpu_temp_both(unsigned long cpu);
145 #endif /* CONFIG_TAU */
146
147 #ifdef CONFIG_SMP
148 DEFINE_PER_CPU(unsigned int, pvr);
149 #endif
150
151 static int show_cpuinfo(struct seq_file *m, void *v)
152 {
153         unsigned long cpu_id = (unsigned long)v - 1;
154         unsigned int pvr;
155         unsigned short maj;
156         unsigned short min;
157
158         if (cpu_id == NR_CPUS) {
159 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
160                 unsigned long bogosum = 0;
161                 int i;
162                 for (i = 0; i < NR_CPUS; ++i)
163                         if (cpu_online(i))
164                                 bogosum += loops_per_jiffy;
165                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
166                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
167 #endif /* CONFIG_SMP && CONFIG_PPC32 */
168                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
169
170                 if (ppc_md.show_cpuinfo != NULL)
171                         ppc_md.show_cpuinfo(m);
172
173                 return 0;
174         }
175
176         /* We only show online cpus: disable preempt (overzealous, I
177          * knew) to prevent cpu going down. */
178         preempt_disable();
179         if (!cpu_online(cpu_id)) {
180                 preempt_enable();
181                 return 0;
182         }
183
184 #ifdef CONFIG_SMP
185         pvr = per_cpu(pvr, cpu_id);
186 #else
187         pvr = mfspr(SPRN_PVR);
188 #endif
189         maj = (pvr >> 8) & 0xFF;
190         min = pvr & 0xFF;
191
192         seq_printf(m, "processor\t: %lu\n", cpu_id);
193         seq_printf(m, "cpu\t\t: ");
194
195         if (cur_cpu_spec->pvr_mask)
196                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
197         else
198                 seq_printf(m, "unknown (%08x)", pvr);
199
200 #ifdef CONFIG_ALTIVEC
201         if (cpu_has_feature(CPU_FTR_ALTIVEC))
202                 seq_printf(m, ", altivec supported");
203 #endif /* CONFIG_ALTIVEC */
204
205         seq_printf(m, "\n");
206
207 #ifdef CONFIG_TAU
208         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
209 #ifdef CONFIG_TAU_AVERAGE
210                 /* more straightforward, but potentially misleading */
211                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
212                            cpu_temp(cpu_id));
213 #else
214                 /* show the actual temp sensor range */
215                 u32 temp;
216                 temp = cpu_temp_both(cpu_id);
217                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
218                            temp & 0xff, temp >> 16);
219 #endif
220         }
221 #endif /* CONFIG_TAU */
222
223         /*
224          * Assume here that all clock rates are the same in a
225          * smp system.  -- Cort
226          */
227         if (ppc_proc_freq)
228                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
229                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
230
231         if (ppc_md.show_percpuinfo != NULL)
232                 ppc_md.show_percpuinfo(m, cpu_id);
233
234         /* If we are a Freescale core do a simple check so
235          * we dont have to keep adding cases in the future */
236         if (PVR_VER(pvr) & 0x8000) {
237                 maj = PVR_MAJ(pvr);
238                 min = PVR_MIN(pvr);
239         } else {
240                 switch (PVR_VER(pvr)) {
241                         case 0x0020:    /* 403 family */
242                                 maj = PVR_MAJ(pvr) + 1;
243                                 min = PVR_MIN(pvr);
244                                 break;
245                         case 0x1008:    /* 740P/750P ?? */
246                                 maj = ((pvr >> 8) & 0xFF) - 1;
247                                 min = pvr & 0xFF;
248                                 break;
249                         default:
250                                 maj = (pvr >> 8) & 0xFF;
251                                 min = pvr & 0xFF;
252                                 break;
253                 }
254         }
255
256         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
257                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
258
259 #ifdef CONFIG_PPC32
260         seq_printf(m, "bogomips\t: %lu.%02lu\n",
261                    loops_per_jiffy / (500000/HZ),
262                    (loops_per_jiffy / (5000/HZ)) % 100);
263 #endif
264
265 #ifdef CONFIG_SMP
266         seq_printf(m, "\n");
267 #endif
268
269         preempt_enable();
270         return 0;
271 }
272
273 static void *c_start(struct seq_file *m, loff_t *pos)
274 {
275         unsigned long i = *pos;
276
277         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
278 }
279
280 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
281 {
282         ++*pos;
283         return c_start(m, pos);
284 }
285
286 static void c_stop(struct seq_file *m, void *v)
287 {
288 }
289
290 struct seq_operations cpuinfo_op = {
291         .start =c_start,
292         .next = c_next,
293         .stop = c_stop,
294         .show = show_cpuinfo,
295 };
296
297 void __init check_for_initrd(void)
298 {
299 #ifdef CONFIG_BLK_DEV_INITRD
300         unsigned long *prop;
301
302         DBG(" -> check_for_initrd()\n");
303
304         if (of_chosen) {
305                 prop = (unsigned long *)get_property(of_chosen,
306                                 "linux,initrd-start", NULL);
307                 if (prop != NULL) {
308                         initrd_start = (unsigned long)__va(*prop);
309                         prop = (unsigned long *)get_property(of_chosen,
310                                         "linux,initrd-end", NULL);
311                         if (prop != NULL) {
312                                 initrd_end = (unsigned long)__va(*prop);
313                                 initrd_below_start_ok = 1;
314                         } else
315                                 initrd_start = 0;
316                 }
317         }
318
319         /* If we were passed an initrd, set the ROOT_DEV properly if the values
320          * look sensible. If not, clear initrd reference.
321          */
322         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
323             initrd_end > initrd_start)
324                 ROOT_DEV = Root_RAM0;
325         else
326                 initrd_start = initrd_end = 0;
327
328         if (initrd_start)
329                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
330
331         DBG(" <- check_for_initrd()\n");
332 #endif /* CONFIG_BLK_DEV_INITRD */
333 }
334
335 #ifdef CONFIG_SMP
336
337 /**
338  * setup_cpu_maps - initialize the following cpu maps:
339  *                  cpu_possible_map
340  *                  cpu_present_map
341  *                  cpu_sibling_map
342  *
343  * Having the possible map set up early allows us to restrict allocations
344  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
345  *
346  * We do not initialize the online map here; cpus set their own bits in
347  * cpu_online_map as they come up.
348  *
349  * This function is valid only for Open Firmware systems.  finish_device_tree
350  * must be called before using this.
351  *
352  * While we're here, we may as well set the "physical" cpu ids in the paca.
353  */
354 void __init smp_setup_cpu_maps(void)
355 {
356         struct device_node *dn = NULL;
357         int cpu = 0;
358         int swap_cpuid = 0;
359
360         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
361                 int *intserv;
362                 int j, len = sizeof(u32), nthreads = 1;
363
364                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
365                                               &len);
366                 if (intserv)
367                         nthreads = len / sizeof(int);
368                 else {
369                         intserv = (int *) get_property(dn, "reg", NULL);
370                         if (!intserv)
371                                 intserv = &cpu; /* assume logical == phys */
372                 }
373
374                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
375                         cpu_set(cpu, cpu_present_map);
376                         set_hard_smp_processor_id(cpu, intserv[j]);
377
378                         if (intserv[j] == boot_cpuid_phys)
379                                 swap_cpuid = cpu;
380                         cpu_set(cpu, cpu_possible_map);
381                         cpu++;
382                 }
383         }
384
385         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
386          * boot cpu is logical 0.
387          */
388         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
389                 u32 tmp;
390                 tmp = get_hard_smp_processor_id(0);
391                 set_hard_smp_processor_id(0, boot_cpuid_phys);
392                 set_hard_smp_processor_id(swap_cpuid, tmp);
393         }
394
395 #ifdef CONFIG_PPC64
396         /*
397          * On pSeries LPAR, we need to know how many cpus
398          * could possibly be added to this partition.
399          */
400         if (_machine == PLATFORM_PSERIES_LPAR &&
401             (dn = of_find_node_by_path("/rtas"))) {
402                 int num_addr_cell, num_size_cell, maxcpus;
403                 unsigned int *ireg;
404
405                 num_addr_cell = prom_n_addr_cells(dn);
406                 num_size_cell = prom_n_size_cells(dn);
407
408                 ireg = (unsigned int *)
409                         get_property(dn, "ibm,lrdr-capacity", NULL);
410
411                 if (!ireg)
412                         goto out;
413
414                 maxcpus = ireg[num_addr_cell + num_size_cell];
415
416                 /* Double maxcpus for processors which have SMT capability */
417                 if (cpu_has_feature(CPU_FTR_SMT))
418                         maxcpus *= 2;
419
420                 if (maxcpus > NR_CPUS) {
421                         printk(KERN_WARNING
422                                "Partition configured for %d cpus, "
423                                "operating system maximum is %d.\n",
424                                maxcpus, NR_CPUS);
425                         maxcpus = NR_CPUS;
426                 } else
427                         printk(KERN_INFO "Partition configured for %d cpus.\n",
428                                maxcpus);
429
430                 for (cpu = 0; cpu < maxcpus; cpu++)
431                         cpu_set(cpu, cpu_possible_map);
432         out:
433                 of_node_put(dn);
434         }
435
436         /*
437          * Do the sibling map; assume only two threads per processor.
438          */
439         for_each_cpu(cpu) {
440                 cpu_set(cpu, cpu_sibling_map[cpu]);
441                 if (cpu_has_feature(CPU_FTR_SMT))
442                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
443         }
444
445         vdso_data->processorCount = num_present_cpus();
446 #endif /* CONFIG_PPC64 */
447 }
448 #endif /* CONFIG_SMP */
449
450 #ifdef CONFIG_XMON
451 static int __init early_xmon(char *p)
452 {
453         /* ensure xmon is enabled */
454         if (p) {
455                 if (strncmp(p, "on", 2) == 0)
456                         xmon_init(1);
457                 if (strncmp(p, "off", 3) == 0)
458                         xmon_init(0);
459                 if (strncmp(p, "early", 5) != 0)
460                         return 0;
461         }
462         xmon_init(1);
463         debugger(NULL);
464
465         return 0;
466 }
467 early_param("xmon", early_xmon);
468 #endif