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Commit | Line | Data |
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1da177e4 | 1 | /* |
033ef338 | 2 | * 64-bit pSeries and RS/6000 setup code. |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * Adapted from 'alpha' version by Gary Thomas | |
6 | * Modified by Cort Dougan (cort@cs.nmt.edu) | |
7 | * Modified by PPC64 Team, IBM Corp | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * bootup setup stuff.. | |
17 | */ | |
18 | ||
19 | #undef DEBUG | |
20 | ||
21 | #include <linux/config.h> | |
62d60e9f | 22 | #include <linux/cpu.h> |
1da177e4 LT |
23 | #include <linux/errno.h> |
24 | #include <linux/sched.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/stddef.h> | |
28 | #include <linux/unistd.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/user.h> | |
31 | #include <linux/a.out.h> | |
32 | #include <linux/tty.h> | |
33 | #include <linux/major.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/reboot.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/ioport.h> | |
38 | #include <linux/console.h> | |
39 | #include <linux/pci.h> | |
cebb2b15 | 40 | #include <linux/utsname.h> |
1da177e4 LT |
41 | #include <linux/adb.h> |
42 | #include <linux/module.h> | |
43 | #include <linux/delay.h> | |
44 | #include <linux/irq.h> | |
45 | #include <linux/seq_file.h> | |
46 | #include <linux/root_dev.h> | |
47 | ||
48 | #include <asm/mmu.h> | |
49 | #include <asm/processor.h> | |
50 | #include <asm/io.h> | |
51 | #include <asm/pgtable.h> | |
52 | #include <asm/prom.h> | |
53 | #include <asm/rtas.h> | |
54 | #include <asm/pci-bridge.h> | |
55 | #include <asm/iommu.h> | |
56 | #include <asm/dma.h> | |
57 | #include <asm/machdep.h> | |
58 | #include <asm/irq.h> | |
59 | #include <asm/time.h> | |
60 | #include <asm/nvram.h> | |
007e8f51 | 61 | #include "xics.h" |
1ababe11 | 62 | #include <asm/firmware.h> |
180a3362 | 63 | #include <asm/pmc.h> |
bbeb3f4c | 64 | #include <asm/mpic.h> |
d387899f | 65 | #include <asm/ppc-pci.h> |
69a80d3f PM |
66 | #include <asm/i8259.h> |
67 | #include <asm/udbg.h> | |
2249ca9d | 68 | #include <asm/smp.h> |
1da177e4 | 69 | |
a1218720 ME |
70 | #include "plpar_wrappers.h" |
71 | ||
1da177e4 LT |
72 | #ifdef DEBUG |
73 | #define DBG(fmt...) udbg_printf(fmt) | |
74 | #else | |
75 | #define DBG(fmt...) | |
76 | #endif | |
77 | ||
1da177e4 LT |
78 | extern void find_udbg_vterm(void); |
79 | extern void system_reset_fwnmi(void); /* from head.S */ | |
80 | extern void machine_check_fwnmi(void); /* from head.S */ | |
81 | extern void generic_find_legacy_serial_ports(u64 *physport, | |
82 | unsigned int *default_speed); | |
83 | ||
84 | int fwnmi_active; /* TRUE if an FWNMI handler is present */ | |
85 | ||
1da177e4 LT |
86 | extern void pSeries_system_reset_exception(struct pt_regs *regs); |
87 | extern int pSeries_machine_check_exception(struct pt_regs *regs); | |
88 | ||
143a1dec PM |
89 | static void pseries_shared_idle(void); |
90 | static void pseries_dedicated_idle(void); | |
62d60e9f | 91 | |
1da177e4 LT |
92 | struct mpic *pSeries_mpic; |
93 | ||
0dd194d0 | 94 | void pSeries_show_cpuinfo(struct seq_file *m) |
1da177e4 LT |
95 | { |
96 | struct device_node *root; | |
97 | const char *model = ""; | |
98 | ||
99 | root = of_find_node_by_path("/"); | |
100 | if (root) | |
101 | model = get_property(root, "model", NULL); | |
102 | seq_printf(m, "machine\t\t: CHRP %s\n", model); | |
103 | of_node_put(root); | |
104 | } | |
105 | ||
106 | /* Initialize firmware assisted non-maskable interrupts if | |
107 | * the firmware supports this feature. | |
108 | * | |
109 | */ | |
110 | static void __init fwnmi_init(void) | |
111 | { | |
112 | int ret; | |
113 | int ibm_nmi_register = rtas_token("ibm,nmi-register"); | |
114 | if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) | |
115 | return; | |
116 | ret = rtas_call(ibm_nmi_register, 2, 1, NULL, | |
117 | __pa((unsigned long)system_reset_fwnmi), | |
118 | __pa((unsigned long)machine_check_fwnmi)); | |
119 | if (ret == 0) | |
120 | fwnmi_active = 1; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | static void __init pSeries_init_mpic(void) |
124 | { | |
125 | unsigned int *addrp; | |
126 | struct device_node *np; | |
f9bd170a | 127 | unsigned long intack = 0; |
1da177e4 LT |
128 | |
129 | /* All ISUs are setup, complete initialization */ | |
130 | mpic_init(pSeries_mpic); | |
131 | ||
132 | /* Check what kind of cascade ACK we have */ | |
133 | if (!(np = of_find_node_by_name(NULL, "pci")) | |
134 | || !(addrp = (unsigned int *) | |
135 | get_property(np, "8259-interrupt-acknowledge", NULL))) | |
136 | printk(KERN_ERR "Cannot find pci to get ack address\n"); | |
137 | else | |
f9bd170a | 138 | intack = addrp[prom_n_addr_cells(np)-1]; |
1da177e4 LT |
139 | of_node_put(np); |
140 | ||
141 | /* Setup the legacy interrupts & controller */ | |
f9bd170a | 142 | i8259_init(intack, 0); |
1da177e4 LT |
143 | |
144 | /* Hook cascade to mpic */ | |
f9bd170a | 145 | mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL); |
1da177e4 LT |
146 | } |
147 | ||
148 | static void __init pSeries_setup_mpic(void) | |
149 | { | |
150 | unsigned int *opprop; | |
151 | unsigned long openpic_addr = 0; | |
152 | unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS]; | |
153 | struct device_node *root; | |
154 | int irq_count; | |
155 | ||
156 | /* Find the Open PIC if present */ | |
157 | root = of_find_node_by_path("/"); | |
158 | opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL); | |
159 | if (opprop != 0) { | |
160 | int n = prom_n_addr_cells(root); | |
161 | ||
162 | for (openpic_addr = 0; n > 0; --n) | |
163 | openpic_addr = (openpic_addr << 32) + *opprop++; | |
164 | printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); | |
165 | } | |
166 | of_node_put(root); | |
167 | ||
168 | BUG_ON(openpic_addr == 0); | |
169 | ||
170 | /* Get the sense values from OF */ | |
171 | prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS); | |
172 | ||
173 | /* Setup the openpic driver */ | |
174 | irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */ | |
175 | pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY, | |
176 | 16, 16, irq_count, /* isu size, irq offset, irq count */ | |
177 | NR_IRQS - 4, /* ipi offset */ | |
178 | senses, irq_count, /* sense & sense size */ | |
179 | " MPIC "); | |
180 | } | |
181 | ||
180a3362 ME |
182 | static void pseries_lpar_enable_pmcs(void) |
183 | { | |
184 | unsigned long set, reset; | |
185 | ||
186 | power4_enable_pmcs(); | |
187 | ||
188 | set = 1UL << 63; | |
189 | reset = 0; | |
190 | plpar_hcall_norets(H_PERFMON, set, reset); | |
191 | ||
192 | /* instruct hypervisor to maintain PMCs */ | |
193 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) | |
194 | get_paca()->lppaca.pmcregs_in_use = 1; | |
195 | } | |
196 | ||
1da177e4 LT |
197 | static void __init pSeries_setup_arch(void) |
198 | { | |
199 | /* Fixup ppc_md depending on the type of interrupt controller */ | |
200 | if (ppc64_interrupt_controller == IC_OPEN_PIC) { | |
fce0d574 | 201 | ppc_md.init_IRQ = pSeries_init_mpic; |
1da177e4 | 202 | ppc_md.get_irq = mpic_get_irq; |
fce0d574 | 203 | ppc_md.cpu_irq_down = mpic_teardown_this_cpu; |
1da177e4 LT |
204 | /* Allocate the mpic now, so that find_and_init_phbs() can |
205 | * fill the ISUs */ | |
206 | pSeries_setup_mpic(); | |
207 | } else { | |
208 | ppc_md.init_IRQ = xics_init_IRQ; | |
209 | ppc_md.get_irq = xics_get_irq; | |
fce0d574 | 210 | ppc_md.cpu_irq_down = xics_teardown_cpu; |
1da177e4 LT |
211 | } |
212 | ||
213 | #ifdef CONFIG_SMP | |
214 | smp_init_pSeries(); | |
215 | #endif | |
216 | /* openpic global configuration register (64-bit format). */ | |
217 | /* openpic Interrupt Source Unit pointer (64-bit format). */ | |
218 | /* python0 facility area (mmio) (64-bit format) REAL address. */ | |
219 | ||
220 | /* init to some ~sane value until calibrate_delay() runs */ | |
221 | loops_per_jiffy = 50000000; | |
222 | ||
223 | if (ROOT_DEV == 0) { | |
224 | printk("No ramdisk, default root is /dev/sda2\n"); | |
225 | ROOT_DEV = Root_SDA2; | |
226 | } | |
227 | ||
228 | fwnmi_init(); | |
229 | ||
230 | /* Find and initialize PCI host bridges */ | |
231 | init_pci_config_tokens(); | |
1da177e4 | 232 | find_and_init_phbs(); |
0160f53e | 233 | eeh_init(); |
1da177e4 | 234 | |
1da177e4 LT |
235 | pSeries_nvram_init(); |
236 | ||
62d60e9f | 237 | /* Choose an idle loop */ |
1ababe11 | 238 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { |
8d15a3e5 | 239 | vpa_init(boot_cpuid); |
62d60e9f ME |
240 | if (get_paca()->lppaca.shared_proc) { |
241 | printk(KERN_INFO "Using shared processor idle loop\n"); | |
050a0938 | 242 | ppc_md.idle_loop = pseries_shared_idle; |
62d60e9f ME |
243 | } else { |
244 | printk(KERN_INFO "Using dedicated idle loop\n"); | |
050a0938 | 245 | ppc_md.idle_loop = pseries_dedicated_idle; |
62d60e9f ME |
246 | } |
247 | } else { | |
248 | printk(KERN_INFO "Using default idle loop\n"); | |
249 | ppc_md.idle_loop = default_idle; | |
250 | } | |
180a3362 ME |
251 | |
252 | if (systemcfg->platform & PLATFORM_LPAR) | |
253 | ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; | |
254 | else | |
255 | ppc_md.enable_pmcs = power4_enable_pmcs; | |
1da177e4 LT |
256 | } |
257 | ||
258 | static int __init pSeries_init_panel(void) | |
259 | { | |
260 | /* Manually leave the kernel version on the panel. */ | |
261 | ppc_md.progress("Linux ppc64\n", 0); | |
cebb2b15 | 262 | ppc_md.progress(system_utsname.version, 0); |
1da177e4 LT |
263 | |
264 | return 0; | |
265 | } | |
266 | arch_initcall(pSeries_init_panel); | |
267 | ||
268 | ||
7a6af5e3 | 269 | /* Build up the ppc64_firmware_features bitmask field |
1da177e4 LT |
270 | * using contents of device-tree/ibm,hypertas-functions. |
271 | * Ultimately this functionality may be moved into prom.c prom_init(). | |
272 | */ | |
aed31351 | 273 | static void __init fw_feature_init(void) |
1da177e4 LT |
274 | { |
275 | struct device_node * dn; | |
276 | char * hypertas; | |
277 | unsigned int len; | |
278 | ||
279 | DBG(" -> fw_feature_init()\n"); | |
280 | ||
7a6af5e3 | 281 | ppc64_firmware_features = 0; |
1da177e4 LT |
282 | dn = of_find_node_by_path("/rtas"); |
283 | if (dn == NULL) { | |
284 | printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n"); | |
285 | goto no_rtas; | |
286 | } | |
287 | ||
288 | hypertas = get_property(dn, "ibm,hypertas-functions", &len); | |
289 | if (hypertas) { | |
290 | while (len > 0){ | |
291 | int i, hypertas_len; | |
292 | /* check value against table of strings */ | |
293 | for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) { | |
294 | if ((firmware_features_table[i].name) && | |
295 | (strcmp(firmware_features_table[i].name,hypertas))==0) { | |
296 | /* we have a match */ | |
7a6af5e3 | 297 | ppc64_firmware_features |= |
1da177e4 LT |
298 | (firmware_features_table[i].val); |
299 | break; | |
300 | } | |
301 | } | |
302 | hypertas_len = strlen(hypertas); | |
303 | len -= hypertas_len +1; | |
304 | hypertas+= hypertas_len +1; | |
305 | } | |
306 | } | |
307 | ||
308 | of_node_put(dn); | |
309 | no_rtas: | |
310 | printk(KERN_INFO "firmware_features = 0x%lx\n", | |
7a6af5e3 | 311 | ppc64_firmware_features); |
1da177e4 LT |
312 | |
313 | DBG(" <- fw_feature_init()\n"); | |
314 | } | |
315 | ||
316 | ||
317 | static void __init pSeries_discover_pic(void) | |
318 | { | |
319 | struct device_node *np; | |
320 | char *typep; | |
321 | ||
322 | /* | |
323 | * Setup interrupt mapping options that are needed for finish_device_tree | |
324 | * to properly parse the OF interrupt tree & do the virtual irq mapping | |
325 | */ | |
326 | __irq_offset_value = NUM_ISA_INTERRUPTS; | |
327 | ppc64_interrupt_controller = IC_INVALID; | |
328 | for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) { | |
329 | typep = (char *)get_property(np, "compatible", NULL); | |
330 | if (strstr(typep, "open-pic")) | |
331 | ppc64_interrupt_controller = IC_OPEN_PIC; | |
332 | else if (strstr(typep, "ppc-xicp")) | |
333 | ppc64_interrupt_controller = IC_PPC_XIC; | |
334 | else | |
335 | printk("pSeries_discover_pic: failed to recognize" | |
336 | " interrupt-controller\n"); | |
337 | break; | |
338 | } | |
339 | } | |
340 | ||
341 | static void pSeries_mach_cpu_die(void) | |
342 | { | |
343 | local_irq_disable(); | |
344 | idle_task_exit(); | |
345 | /* Some hardware requires clearing the CPPR, while other hardware does not | |
346 | * it is safe either way | |
347 | */ | |
348 | pSeriesLP_cppr_info(0, 0); | |
349 | rtas_stop_self(); | |
350 | /* Should never get here... */ | |
351 | BUG(); | |
352 | for(;;); | |
353 | } | |
354 | ||
cab0af98 ME |
355 | static int pseries_set_dabr(unsigned long dabr) |
356 | { | |
357 | if (firmware_has_feature(FW_FEATURE_XDABR)) { | |
358 | /* We want to catch accesses from kernel and userspace */ | |
359 | return plpar_set_xdabr(dabr, H_DABRX_KERNEL | H_DABRX_USER); | |
360 | } | |
361 | ||
362 | return plpar_set_dabr(dabr); | |
363 | } | |
364 | ||
1da177e4 LT |
365 | |
366 | /* | |
367 | * Early initialization. Relocation is on but do not reference unbolted pages | |
368 | */ | |
369 | static void __init pSeries_init_early(void) | |
370 | { | |
371 | void *comport; | |
372 | int iommu_off = 0; | |
373 | unsigned int default_speed; | |
374 | u64 physport; | |
375 | ||
376 | DBG(" -> pSeries_init_early()\n"); | |
377 | ||
378 | fw_feature_init(); | |
379 | ||
380 | if (systemcfg->platform & PLATFORM_LPAR) | |
381 | hpte_init_lpar(); | |
382 | else { | |
383 | hpte_init_native(); | |
384 | iommu_off = (of_chosen && | |
385 | get_property(of_chosen, "linux,iommu-off", NULL)); | |
386 | } | |
387 | ||
388 | generic_find_legacy_serial_ports(&physport, &default_speed); | |
389 | ||
390 | if (systemcfg->platform & PLATFORM_LPAR) | |
391 | find_udbg_vterm(); | |
392 | else if (physport) { | |
393 | /* Map the uart for udbg. */ | |
dfbacdc1 | 394 | comport = (void *)ioremap(physport, 16); |
1da177e4 LT |
395 | udbg_init_uart(comport, default_speed); |
396 | ||
1da177e4 LT |
397 | DBG("Hello World !\n"); |
398 | } | |
399 | ||
cab0af98 ME |
400 | if (firmware_has_feature(FW_FEATURE_XDABR | FW_FEATURE_DABR)) |
401 | ppc_md.set_dabr = pseries_set_dabr; | |
1da177e4 LT |
402 | |
403 | iommu_init_early_pSeries(); | |
404 | ||
405 | pSeries_discover_pic(); | |
406 | ||
407 | DBG(" <- pSeries_init_early()\n"); | |
408 | } | |
409 | ||
410 | ||
1da177e4 LT |
411 | static int pSeries_check_legacy_ioport(unsigned int baseport) |
412 | { | |
413 | struct device_node *np; | |
414 | ||
415 | #define I8042_DATA_REG 0x60 | |
416 | #define FDC_BASE 0x3f0 | |
417 | ||
418 | ||
419 | switch(baseport) { | |
420 | case I8042_DATA_REG: | |
421 | np = of_find_node_by_type(NULL, "8042"); | |
422 | if (np == NULL) | |
423 | return -ENODEV; | |
424 | of_node_put(np); | |
425 | break; | |
426 | case FDC_BASE: | |
427 | np = of_find_node_by_type(NULL, "fdc"); | |
428 | if (np == NULL) | |
429 | return -ENODEV; | |
430 | of_node_put(np); | |
431 | break; | |
432 | } | |
433 | return 0; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Called very early, MMU is off, device-tree isn't unflattened | |
438 | */ | |
439 | extern struct machdep_calls pSeries_md; | |
440 | ||
441 | static int __init pSeries_probe(int platform) | |
442 | { | |
443 | if (platform != PLATFORM_PSERIES && | |
444 | platform != PLATFORM_PSERIES_LPAR) | |
445 | return 0; | |
446 | ||
447 | /* if we have some ppc_md fixups for LPAR to do, do | |
448 | * it here ... | |
449 | */ | |
450 | ||
451 | return 1; | |
452 | } | |
453 | ||
c66d5dd6 ME |
454 | DECLARE_PER_CPU(unsigned long, smt_snooze_delay); |
455 | ||
050a0938 AB |
456 | static inline void dedicated_idle_sleep(unsigned int cpu) |
457 | { | |
458 | struct paca_struct *ppaca = &paca[cpu ^ 1]; | |
459 | ||
460 | /* Only sleep if the other thread is not idle */ | |
461 | if (!(ppaca->lppaca.idle)) { | |
462 | local_irq_disable(); | |
463 | ||
464 | /* | |
465 | * We are about to sleep the thread and so wont be polling any | |
466 | * more. | |
467 | */ | |
468 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
469 | ||
470 | /* | |
471 | * SMT dynamic mode. Cede will result in this thread going | |
472 | * dormant, if the partner thread is still doing work. Thread | |
473 | * wakes up if partner goes idle, an interrupt is presented, or | |
474 | * a prod occurs. Returning from the cede enables external | |
475 | * interrupts. | |
476 | */ | |
477 | if (!need_resched()) | |
478 | cede_processor(); | |
479 | else | |
480 | local_irq_enable(); | |
481 | } else { | |
482 | /* | |
483 | * Give the HV an opportunity at the processor, since we are | |
484 | * not doing any work. | |
485 | */ | |
486 | poll_pending(); | |
487 | } | |
488 | } | |
489 | ||
143a1dec PM |
490 | static void pseries_dedicated_idle(void) |
491 | { | |
c66d5dd6 | 492 | long oldval; |
050a0938 AB |
493 | struct paca_struct *lpaca = get_paca(); |
494 | unsigned int cpu = smp_processor_id(); | |
c66d5dd6 ME |
495 | unsigned long start_snooze; |
496 | unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay); | |
c66d5dd6 ME |
497 | |
498 | while (1) { | |
499 | /* | |
500 | * Indicate to the HV that we are idle. Now would be | |
501 | * a good time to find other work to dispatch. | |
502 | */ | |
503 | lpaca->lppaca.idle = 1; | |
504 | ||
505 | oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED); | |
506 | if (!oldval) { | |
507 | set_thread_flag(TIF_POLLING_NRFLAG); | |
050a0938 | 508 | |
c66d5dd6 ME |
509 | start_snooze = __get_tb() + |
510 | *smt_snooze_delay * tb_ticks_per_usec; | |
050a0938 | 511 | |
c66d5dd6 | 512 | while (!need_resched() && !cpu_is_offline(cpu)) { |
050a0938 AB |
513 | ppc64_runlatch_off(); |
514 | ||
c66d5dd6 ME |
515 | /* |
516 | * Go into low thread priority and possibly | |
517 | * low power mode. | |
518 | */ | |
519 | HMT_low(); | |
520 | HMT_very_low(); | |
521 | ||
050a0938 AB |
522 | if (*smt_snooze_delay != 0 && |
523 | __get_tb() > start_snooze) { | |
524 | HMT_medium(); | |
525 | dedicated_idle_sleep(cpu); | |
c66d5dd6 | 526 | } |
050a0938 | 527 | |
c66d5dd6 ME |
528 | } |
529 | ||
050a0938 | 530 | HMT_medium(); |
c66d5dd6 ME |
531 | clear_thread_flag(TIF_POLLING_NRFLAG); |
532 | } else { | |
533 | set_need_resched(); | |
534 | } | |
535 | ||
c66d5dd6 | 536 | lpaca->lppaca.idle = 0; |
050a0938 AB |
537 | ppc64_runlatch_on(); |
538 | ||
c66d5dd6 | 539 | schedule(); |
050a0938 | 540 | |
c66d5dd6 ME |
541 | if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING) |
542 | cpu_die(); | |
543 | } | |
c66d5dd6 ME |
544 | } |
545 | ||
143a1dec | 546 | static void pseries_shared_idle(void) |
c66d5dd6 ME |
547 | { |
548 | struct paca_struct *lpaca = get_paca(); | |
549 | unsigned int cpu = smp_processor_id(); | |
550 | ||
551 | while (1) { | |
552 | /* | |
553 | * Indicate to the HV that we are idle. Now would be | |
554 | * a good time to find other work to dispatch. | |
555 | */ | |
556 | lpaca->lppaca.idle = 1; | |
557 | ||
558 | while (!need_resched() && !cpu_is_offline(cpu)) { | |
559 | local_irq_disable(); | |
050a0938 | 560 | ppc64_runlatch_off(); |
c66d5dd6 ME |
561 | |
562 | /* | |
563 | * Yield the processor to the hypervisor. We return if | |
564 | * an external interrupt occurs (which are driven prior | |
565 | * to returning here) or if a prod occurs from another | |
566 | * processor. When returning here, external interrupts | |
567 | * are enabled. | |
568 | * | |
569 | * Check need_resched() again with interrupts disabled | |
570 | * to avoid a race. | |
571 | */ | |
572 | if (!need_resched()) | |
573 | cede_processor(); | |
574 | else | |
575 | local_irq_enable(); | |
050a0938 AB |
576 | |
577 | HMT_medium(); | |
c66d5dd6 ME |
578 | } |
579 | ||
c66d5dd6 | 580 | lpaca->lppaca.idle = 0; |
050a0938 AB |
581 | ppc64_runlatch_on(); |
582 | ||
c66d5dd6 | 583 | schedule(); |
050a0938 AB |
584 | |
585 | if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING) | |
c66d5dd6 ME |
586 | cpu_die(); |
587 | } | |
c66d5dd6 ME |
588 | } |
589 | ||
4267292b PM |
590 | static int pSeries_pci_probe_mode(struct pci_bus *bus) |
591 | { | |
592 | if (systemcfg->platform & PLATFORM_LPAR) | |
593 | return PCI_PROBE_DEVTREE; | |
594 | return PCI_PROBE_NORMAL; | |
595 | } | |
596 | ||
1da177e4 LT |
597 | struct machdep_calls __initdata pSeries_md = { |
598 | .probe = pSeries_probe, | |
599 | .setup_arch = pSeries_setup_arch, | |
600 | .init_early = pSeries_init_early, | |
0dd194d0 | 601 | .show_cpuinfo = pSeries_show_cpuinfo, |
1da177e4 LT |
602 | .log_error = pSeries_log_error, |
603 | .pcibios_fixup = pSeries_final_fixup, | |
4267292b | 604 | .pci_probe_mode = pSeries_pci_probe_mode, |
dad32bbf | 605 | .irq_bus_setup = pSeries_irq_bus_setup, |
f4fcbbe9 PM |
606 | .restart = rtas_restart, |
607 | .power_off = rtas_power_off, | |
608 | .halt = rtas_halt, | |
1da177e4 LT |
609 | .panic = rtas_os_term, |
610 | .cpu_die = pSeries_mach_cpu_die, | |
773bf9c4 AB |
611 | .get_boot_time = rtas_get_boot_time, |
612 | .get_rtc_time = rtas_get_rtc_time, | |
613 | .set_rtc_time = rtas_set_rtc_time, | |
10f7e7c1 | 614 | .calibrate_decr = generic_calibrate_decr, |
6566c6f1 | 615 | .progress = rtas_progress, |
1da177e4 LT |
616 | .check_legacy_ioport = pSeries_check_legacy_ioport, |
617 | .system_reset_exception = pSeries_system_reset_exception, | |
618 | .machine_check_exception = pSeries_machine_check_exception, | |
619 | }; |