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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/sparc/kernel/setup.c
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
7 */
8
9#include <linux/errno.h>
10#include <linux/sched.h>
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/stddef.h>
14#include <linux/unistd.h>
15#include <linux/ptrace.h>
16#include <linux/slab.h>
17#include <linux/initrd.h>
18#include <asm/smp.h>
19#include <linux/user.h>
20#include <linux/screen_info.h>
21#include <linux/delay.h>
22#include <linux/fs.h>
23#include <linux/seq_file.h>
24#include <linux/syscalls.h>
25#include <linux/kdev_t.h>
26#include <linux/major.h>
27#include <linux/string.h>
28#include <linux/init.h>
29#include <linux/interrupt.h>
30#include <linux/console.h>
31#include <linux/spinlock.h>
32#include <linux/root_dev.h>
33#include <linux/cpu.h>
34#include <linux/kdebug.h>
35#include <linux/export.h>
36#include <linux/start_kernel.h>
37#include <uapi/linux/mount.h>
38
39#include <asm/io.h>
40#include <asm/processor.h>
41#include <asm/oplib.h>
42#include <asm/page.h>
43#include <asm/traps.h>
44#include <asm/vaddrs.h>
45#include <asm/mbus.h>
46#include <asm/idprom.h>
47#include <asm/cpudata.h>
48#include <asm/setup.h>
49#include <asm/cacheflush.h>
50#include <asm/sections.h>
51
52#include "kernel.h"
53
54struct screen_info screen_info = {
55 0, 0, /* orig-x, orig-y */
56 0, /* unused */
57 0, /* orig-video-page */
58 0, /* orig-video-mode */
59 128, /* orig-video-cols */
60 0,0,0, /* ega_ax, ega_bx, ega_cx */
61 54, /* orig-video-lines */
62 0, /* orig-video-isVGA */
63 16 /* orig-video-points */
64};
65
66/* Typing sync at the prom prompt calls the function pointed to by
67 * romvec->pv_synchook which I set to the following function.
68 * This should sync all filesystems and return, for now it just
69 * prints out pretty messages and returns.
70 */
71
72/* Pretty sick eh? */
73static void prom_sync_me(void)
74{
75 unsigned long prom_tbr, flags;
76
77 /* XXX Badly broken. FIX! - Anton */
78 local_irq_save(flags);
79 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
80 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
81 "nop\n\t"
82 "nop\n\t"
83 "nop\n\t" : : "r" (&trapbase));
84
85 prom_printf("PROM SYNC COMMAND...\n");
86 show_free_areas(0, NULL);
87 if (!is_idle_task(current)) {
88 local_irq_enable();
89 ksys_sync();
90 local_irq_disable();
91 }
92 prom_printf("Returning to prom\n");
93
94 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
95 "nop\n\t"
96 "nop\n\t"
97 "nop\n\t" : : "r" (prom_tbr));
98 local_irq_restore(flags);
99}
100
101static unsigned int boot_flags __initdata = 0;
102#define BOOTME_DEBUG 0x1
103
104/* Exported for mm/init.c:paging_init. */
105unsigned long cmdline_memory_size __initdata = 0;
106
107/* which CPU booted us (0xff = not set) */
108unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
109
110static void
111prom_console_write(struct console *con, const char *s, unsigned int n)
112{
113 prom_write(s, n);
114}
115
116static struct console prom_early_console = {
117 .name = "earlyprom",
118 .write = prom_console_write,
119 .flags = CON_PRINTBUFFER | CON_BOOT,
120 .index = -1,
121};
122
123/*
124 * Process kernel command line switches that are specific to the
125 * SPARC or that require special low-level processing.
126 */
127static void __init process_switch(char c)
128{
129 switch (c) {
130 case 'd':
131 boot_flags |= BOOTME_DEBUG;
132 break;
133 case 's':
134 break;
135 case 'h':
136 prom_printf("boot_flags_init: Halt!\n");
137 prom_halt();
138 break;
139 case 'p':
140 prom_early_console.flags &= ~CON_BOOT;
141 break;
142 default:
143 printk("Unknown boot switch (-%c)\n", c);
144 break;
145 }
146}
147
148static void __init boot_flags_init(char *commands)
149{
150 while (*commands) {
151 /* Move to the start of the next "argument". */
152 while (*commands == ' ')
153 commands++;
154
155 /* Process any command switches, otherwise skip it. */
156 if (*commands == '\0')
157 break;
158 if (*commands == '-') {
159 commands++;
160 while (*commands && *commands != ' ')
161 process_switch(*commands++);
162 continue;
163 }
164 if (!strncmp(commands, "mem=", 4)) {
165 /*
166 * "mem=XXX[kKmM] overrides the PROM-reported
167 * memory size.
168 */
169 cmdline_memory_size = simple_strtoul(commands + 4,
170 &commands, 0);
171 if (*commands == 'K' || *commands == 'k') {
172 cmdline_memory_size <<= 10;
173 commands++;
174 } else if (*commands=='M' || *commands=='m') {
175 cmdline_memory_size <<= 20;
176 commands++;
177 }
178 }
179 while (*commands && *commands != ' ')
180 commands++;
181 }
182}
183
184extern unsigned short root_flags;
185extern unsigned short root_dev;
186extern unsigned short ram_flags;
187#define RAMDISK_IMAGE_START_MASK 0x07FF
188#define RAMDISK_PROMPT_FLAG 0x8000
189#define RAMDISK_LOAD_FLAG 0x4000
190
191extern int root_mountflags;
192
193char reboot_command[COMMAND_LINE_SIZE];
194
195struct cpuid_patch_entry {
196 unsigned int addr;
197 unsigned int sun4d[3];
198 unsigned int leon[3];
199};
200extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
201
202static void __init per_cpu_patch(void)
203{
204 struct cpuid_patch_entry *p;
205
206 if (sparc_cpu_model == sun4m) {
207 /* Nothing to do, this is what the unpatched code
208 * targets.
209 */
210 return;
211 }
212
213 p = &__cpuid_patch;
214 while (p < &__cpuid_patch_end) {
215 unsigned long addr = p->addr;
216 unsigned int *insns;
217
218 switch (sparc_cpu_model) {
219 case sun4d:
220 insns = &p->sun4d[0];
221 break;
222
223 case sparc_leon:
224 insns = &p->leon[0];
225 break;
226 default:
227 prom_printf("Unknown cpu type, halting.\n");
228 prom_halt();
229 }
230 *(unsigned int *) (addr + 0) = insns[0];
231 flushi(addr + 0);
232 *(unsigned int *) (addr + 4) = insns[1];
233 flushi(addr + 4);
234 *(unsigned int *) (addr + 8) = insns[2];
235 flushi(addr + 8);
236
237 p++;
238 }
239}
240
241struct leon_1insn_patch_entry {
242 unsigned int addr;
243 unsigned int insn;
244};
245
246enum sparc_cpu sparc_cpu_model;
247EXPORT_SYMBOL(sparc_cpu_model);
248
249static __init void leon_patch(void)
250{
251 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
252 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
253
254 /* Default instruction is leon - no patching */
255 if (sparc_cpu_model == sparc_leon)
256 return;
257
258 while (start < end) {
259 unsigned long addr = start->addr;
260
261 *(unsigned int *)(addr) = start->insn;
262 flushi(addr);
263
264 start++;
265 }
266}
267
268struct tt_entry *sparc_ttable;
269
270/* Called from head_32.S - before we have setup anything
271 * in the kernel. Be very careful with what you do here.
272 */
273void __init sparc32_start_kernel(struct linux_romvec *rp)
274{
275 prom_init(rp);
276
277 /* Set sparc_cpu_model */
278 sparc_cpu_model = sun_unknown;
279 if (!strcmp(&cputypval[0], "sun4m"))
280 sparc_cpu_model = sun4m;
281 if (!strcmp(&cputypval[0], "sun4s"))
282 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
283 if (!strcmp(&cputypval[0], "sun4d"))
284 sparc_cpu_model = sun4d;
285 if (!strcmp(&cputypval[0], "sun4e"))
286 sparc_cpu_model = sun4e;
287 if (!strcmp(&cputypval[0], "sun4u"))
288 sparc_cpu_model = sun4u;
289 if (!strncmp(&cputypval[0], "leon" , 4))
290 sparc_cpu_model = sparc_leon;
291
292 leon_patch();
293 start_kernel();
294}
295
296void __init setup_arch(char **cmdline_p)
297{
298 int i;
299 unsigned long highest_paddr;
300
301 sparc_ttable = &trapbase;
302
303 /* Initialize PROM console and command line. */
304 *cmdline_p = prom_getbootargs();
305 strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
306 parse_early_param();
307
308 boot_flags_init(*cmdline_p);
309
310 register_console(&prom_early_console);
311
312 switch(sparc_cpu_model) {
313 case sun4m:
314 pr_info("ARCH: SUN4M\n");
315 break;
316 case sun4d:
317 pr_info("ARCH: SUN4D\n");
318 break;
319 case sun4e:
320 pr_info("ARCH: SUN4E\n");
321 break;
322 case sun4u:
323 pr_info("ARCH: SUN4U\n");
324 break;
325 case sparc_leon:
326 pr_info("ARCH: LEON\n");
327 break;
328 default:
329 pr_info("ARCH: UNKNOWN!\n");
330 break;
331 }
332
333 idprom_init();
334 load_mmu();
335
336 phys_base = 0xffffffffUL;
337 highest_paddr = 0UL;
338 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
339 unsigned long top;
340
341 if (sp_banks[i].base_addr < phys_base)
342 phys_base = sp_banks[i].base_addr;
343 top = sp_banks[i].base_addr +
344 sp_banks[i].num_bytes;
345 if (highest_paddr < top)
346 highest_paddr = top;
347 }
348 pfn_base = phys_base >> PAGE_SHIFT;
349
350 if (!root_flags)
351 root_mountflags &= ~MS_RDONLY;
352 ROOT_DEV = old_decode_dev(root_dev);
353#ifdef CONFIG_BLK_DEV_RAM
354 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
355#endif
356
357 prom_setsync(prom_sync_me);
358
359 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
360 ((*(short *)linux_dbvec) != -1)) {
361 printk("Booted under KADB. Syncing trap table.\n");
362 (*(linux_dbvec->teach_debugger))();
363 }
364
365 /* Run-time patch instructions to match the cpu model */
366 per_cpu_patch();
367
368 paging_init();
369
370 smp_setup_cpu_possible_map();
371}
372
373extern int stop_a_enabled;
374
375void sun_do_break(void)
376{
377 if (!stop_a_enabled)
378 return;
379
380 printk("\n");
381 flush_user_windows();
382
383 prom_cmdline();
384}
385EXPORT_SYMBOL(sun_do_break);
386
387int stop_a_enabled = 1;
388
389static int __init topology_init(void)
390{
391 int i, ncpus, err;
392
393 /* Count the number of physically present processors in
394 * the machine, even on uniprocessor, so that /proc/cpuinfo
395 * output is consistent with 2.4.x
396 */
397 ncpus = 0;
398 while (!cpu_find_by_instance(ncpus, NULL, NULL))
399 ncpus++;
400 ncpus_probed = ncpus;
401
402 err = 0;
403 for_each_online_cpu(i) {
404 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
405 if (!p)
406 err = -ENOMEM;
407 else
408 register_cpu(p, i);
409 }
410
411 return err;
412}
413
414subsys_initcall(topology_init);
1/*
2 * linux/arch/sparc/kernel/setup.c
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
6 */
7
8#include <linux/errno.h>
9#include <linux/sched.h>
10#include <linux/kernel.h>
11#include <linux/mm.h>
12#include <linux/stddef.h>
13#include <linux/unistd.h>
14#include <linux/ptrace.h>
15#include <linux/slab.h>
16#include <linux/initrd.h>
17#include <asm/smp.h>
18#include <linux/user.h>
19#include <linux/screen_info.h>
20#include <linux/delay.h>
21#include <linux/fs.h>
22#include <linux/seq_file.h>
23#include <linux/syscalls.h>
24#include <linux/kdev_t.h>
25#include <linux/major.h>
26#include <linux/string.h>
27#include <linux/init.h>
28#include <linux/interrupt.h>
29#include <linux/console.h>
30#include <linux/spinlock.h>
31#include <linux/root_dev.h>
32#include <linux/cpu.h>
33#include <linux/kdebug.h>
34#include <linux/export.h>
35#include <linux/start_kernel.h>
36
37#include <asm/io.h>
38#include <asm/processor.h>
39#include <asm/oplib.h>
40#include <asm/page.h>
41#include <asm/pgtable.h>
42#include <asm/traps.h>
43#include <asm/vaddrs.h>
44#include <asm/mbus.h>
45#include <asm/idprom.h>
46#include <asm/cpudata.h>
47#include <asm/setup.h>
48#include <asm/cacheflush.h>
49#include <asm/sections.h>
50
51#include "kernel.h"
52
53struct screen_info screen_info = {
54 0, 0, /* orig-x, orig-y */
55 0, /* unused */
56 0, /* orig-video-page */
57 0, /* orig-video-mode */
58 128, /* orig-video-cols */
59 0,0,0, /* ega_ax, ega_bx, ega_cx */
60 54, /* orig-video-lines */
61 0, /* orig-video-isVGA */
62 16 /* orig-video-points */
63};
64
65/* Typing sync at the prom prompt calls the function pointed to by
66 * romvec->pv_synchook which I set to the following function.
67 * This should sync all filesystems and return, for now it just
68 * prints out pretty messages and returns.
69 */
70
71/* Pretty sick eh? */
72static void prom_sync_me(void)
73{
74 unsigned long prom_tbr, flags;
75
76 /* XXX Badly broken. FIX! - Anton */
77 local_irq_save(flags);
78 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
79 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
80 "nop\n\t"
81 "nop\n\t"
82 "nop\n\t" : : "r" (&trapbase));
83
84 prom_printf("PROM SYNC COMMAND...\n");
85 show_free_areas(0);
86 if (!is_idle_task(current)) {
87 local_irq_enable();
88 sys_sync();
89 local_irq_disable();
90 }
91 prom_printf("Returning to prom\n");
92
93 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
94 "nop\n\t"
95 "nop\n\t"
96 "nop\n\t" : : "r" (prom_tbr));
97 local_irq_restore(flags);
98}
99
100static unsigned int boot_flags __initdata = 0;
101#define BOOTME_DEBUG 0x1
102
103/* Exported for mm/init.c:paging_init. */
104unsigned long cmdline_memory_size __initdata = 0;
105
106/* which CPU booted us (0xff = not set) */
107unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
108
109static void
110prom_console_write(struct console *con, const char *s, unsigned int n)
111{
112 prom_write(s, n);
113}
114
115static struct console prom_early_console = {
116 .name = "earlyprom",
117 .write = prom_console_write,
118 .flags = CON_PRINTBUFFER | CON_BOOT,
119 .index = -1,
120};
121
122/*
123 * Process kernel command line switches that are specific to the
124 * SPARC or that require special low-level processing.
125 */
126static void __init process_switch(char c)
127{
128 switch (c) {
129 case 'd':
130 boot_flags |= BOOTME_DEBUG;
131 break;
132 case 's':
133 break;
134 case 'h':
135 prom_printf("boot_flags_init: Halt!\n");
136 prom_halt();
137 break;
138 case 'p':
139 prom_early_console.flags &= ~CON_BOOT;
140 break;
141 default:
142 printk("Unknown boot switch (-%c)\n", c);
143 break;
144 }
145}
146
147static void __init boot_flags_init(char *commands)
148{
149 while (*commands) {
150 /* Move to the start of the next "argument". */
151 while (*commands && *commands == ' ')
152 commands++;
153
154 /* Process any command switches, otherwise skip it. */
155 if (*commands == '\0')
156 break;
157 if (*commands == '-') {
158 commands++;
159 while (*commands && *commands != ' ')
160 process_switch(*commands++);
161 continue;
162 }
163 if (!strncmp(commands, "mem=", 4)) {
164 /*
165 * "mem=XXX[kKmM] overrides the PROM-reported
166 * memory size.
167 */
168 cmdline_memory_size = simple_strtoul(commands + 4,
169 &commands, 0);
170 if (*commands == 'K' || *commands == 'k') {
171 cmdline_memory_size <<= 10;
172 commands++;
173 } else if (*commands=='M' || *commands=='m') {
174 cmdline_memory_size <<= 20;
175 commands++;
176 }
177 }
178 while (*commands && *commands != ' ')
179 commands++;
180 }
181}
182
183extern unsigned short root_flags;
184extern unsigned short root_dev;
185extern unsigned short ram_flags;
186#define RAMDISK_IMAGE_START_MASK 0x07FF
187#define RAMDISK_PROMPT_FLAG 0x8000
188#define RAMDISK_LOAD_FLAG 0x4000
189
190extern int root_mountflags;
191
192char reboot_command[COMMAND_LINE_SIZE];
193
194struct cpuid_patch_entry {
195 unsigned int addr;
196 unsigned int sun4d[3];
197 unsigned int leon[3];
198};
199extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
200
201static void __init per_cpu_patch(void)
202{
203 struct cpuid_patch_entry *p;
204
205 if (sparc_cpu_model == sun4m) {
206 /* Nothing to do, this is what the unpatched code
207 * targets.
208 */
209 return;
210 }
211
212 p = &__cpuid_patch;
213 while (p < &__cpuid_patch_end) {
214 unsigned long addr = p->addr;
215 unsigned int *insns;
216
217 switch (sparc_cpu_model) {
218 case sun4d:
219 insns = &p->sun4d[0];
220 break;
221
222 case sparc_leon:
223 insns = &p->leon[0];
224 break;
225 default:
226 prom_printf("Unknown cpu type, halting.\n");
227 prom_halt();
228 }
229 *(unsigned int *) (addr + 0) = insns[0];
230 flushi(addr + 0);
231 *(unsigned int *) (addr + 4) = insns[1];
232 flushi(addr + 4);
233 *(unsigned int *) (addr + 8) = insns[2];
234 flushi(addr + 8);
235
236 p++;
237 }
238}
239
240struct leon_1insn_patch_entry {
241 unsigned int addr;
242 unsigned int insn;
243};
244
245enum sparc_cpu sparc_cpu_model;
246EXPORT_SYMBOL(sparc_cpu_model);
247
248static __init void leon_patch(void)
249{
250 struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
251 struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
252
253 /* Default instruction is leon - no patching */
254 if (sparc_cpu_model == sparc_leon)
255 return;
256
257 while (start < end) {
258 unsigned long addr = start->addr;
259
260 *(unsigned int *)(addr) = start->insn;
261 flushi(addr);
262
263 start++;
264 }
265}
266
267struct tt_entry *sparc_ttable;
268static struct pt_regs fake_swapper_regs;
269
270/* Called from head_32.S - before we have setup anything
271 * in the kernel. Be very careful with what you do here.
272 */
273void __init sparc32_start_kernel(struct linux_romvec *rp)
274{
275 prom_init(rp);
276
277 /* Set sparc_cpu_model */
278 sparc_cpu_model = sun_unknown;
279 if (!strcmp(&cputypval[0], "sun4m"))
280 sparc_cpu_model = sun4m;
281 if (!strcmp(&cputypval[0], "sun4s"))
282 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
283 if (!strcmp(&cputypval[0], "sun4d"))
284 sparc_cpu_model = sun4d;
285 if (!strcmp(&cputypval[0], "sun4e"))
286 sparc_cpu_model = sun4e;
287 if (!strcmp(&cputypval[0], "sun4u"))
288 sparc_cpu_model = sun4u;
289 if (!strncmp(&cputypval[0], "leon" , 4))
290 sparc_cpu_model = sparc_leon;
291
292 leon_patch();
293 start_kernel();
294}
295
296void __init setup_arch(char **cmdline_p)
297{
298 int i;
299 unsigned long highest_paddr;
300
301 sparc_ttable = &trapbase;
302
303 /* Initialize PROM console and command line. */
304 *cmdline_p = prom_getbootargs();
305 strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
306 parse_early_param();
307
308 boot_flags_init(*cmdline_p);
309
310 register_console(&prom_early_console);
311
312 printk("ARCH: ");
313 switch(sparc_cpu_model) {
314 case sun4m:
315 printk("SUN4M\n");
316 break;
317 case sun4d:
318 printk("SUN4D\n");
319 break;
320 case sun4e:
321 printk("SUN4E\n");
322 break;
323 case sun4u:
324 printk("SUN4U\n");
325 break;
326 case sparc_leon:
327 printk("LEON\n");
328 break;
329 default:
330 printk("UNKNOWN!\n");
331 break;
332 }
333
334#ifdef CONFIG_DUMMY_CONSOLE
335 conswitchp = &dummy_con;
336#endif
337
338 idprom_init();
339 load_mmu();
340
341 phys_base = 0xffffffffUL;
342 highest_paddr = 0UL;
343 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
344 unsigned long top;
345
346 if (sp_banks[i].base_addr < phys_base)
347 phys_base = sp_banks[i].base_addr;
348 top = sp_banks[i].base_addr +
349 sp_banks[i].num_bytes;
350 if (highest_paddr < top)
351 highest_paddr = top;
352 }
353 pfn_base = phys_base >> PAGE_SHIFT;
354
355 if (!root_flags)
356 root_mountflags &= ~MS_RDONLY;
357 ROOT_DEV = old_decode_dev(root_dev);
358#ifdef CONFIG_BLK_DEV_RAM
359 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
360 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
361 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
362#endif
363
364 prom_setsync(prom_sync_me);
365
366 if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
367 ((*(short *)linux_dbvec) != -1)) {
368 printk("Booted under KADB. Syncing trap table.\n");
369 (*(linux_dbvec->teach_debugger))();
370 }
371
372 init_task.thread.kregs = &fake_swapper_regs;
373
374 /* Run-time patch instructions to match the cpu model */
375 per_cpu_patch();
376
377 paging_init();
378
379 smp_setup_cpu_possible_map();
380}
381
382extern int stop_a_enabled;
383
384void sun_do_break(void)
385{
386 if (!stop_a_enabled)
387 return;
388
389 printk("\n");
390 flush_user_windows();
391
392 prom_cmdline();
393}
394EXPORT_SYMBOL(sun_do_break);
395
396int stop_a_enabled = 1;
397
398static int __init topology_init(void)
399{
400 int i, ncpus, err;
401
402 /* Count the number of physically present processors in
403 * the machine, even on uniprocessor, so that /proc/cpuinfo
404 * output is consistent with 2.4.x
405 */
406 ncpus = 0;
407 while (!cpu_find_by_instance(ncpus, NULL, NULL))
408 ncpus++;
409 ncpus_probed = ncpus;
410
411 err = 0;
412 for_each_online_cpu(i) {
413 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
414 if (!p)
415 err = -ENOMEM;
416 else
417 register_cpu(p, i);
418 }
419
420 return err;
421}
422
423subsys_initcall(topology_init);