blob: 169d74cef157d84e347afb489f3cce3d805f9a8a [file] [log] [blame]
Paul Mackerras40ef8cb2005-10-10 22:50:37 +10001/*
2 *
3 * Common boot and setup code.
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
13#undef DEBUG
14
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100015#include <linux/module.h>
16#include <linux/string.h>
17#include <linux/sched.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/reboot.h>
21#include <linux/delay.h>
22#include <linux/initrd.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100023#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>
Anton Blanchard7a0268f2006-01-11 13:16:44 +110034#include <linux/bootmem.h>
Benjamin Herrenschmidt12d04ee2006-11-11 17:25:02 +110035#include <linux/pci.h>
Benjamin Herrenschmidt945feb12008-04-17 14:35:01 +100036#include <linux/lockdep.h>
David S. Millerd9b2b2a2008-02-13 16:56:49 -080037#include <linux/lmb.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100038#include <asm/io.h>
Michael Ellerman0cc47462005-12-04 18:39:37 +110039#include <asm/kdump.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100040#include <asm/prom.h>
41#include <asm/processor.h>
42#include <asm/pgtable.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100043#include <asm/smp.h>
44#include <asm/elf.h>
45#include <asm/machdep.h>
46#include <asm/paca.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100047#include <asm/time.h>
48#include <asm/cputable.h>
49#include <asm/sections.h>
50#include <asm/btext.h>
51#include <asm/nvram.h>
52#include <asm/setup.h>
53#include <asm/system.h>
54#include <asm/rtas.h>
55#include <asm/iommu.h>
56#include <asm/serial.h>
57#include <asm/cache.h>
58#include <asm/page.h>
59#include <asm/mmu.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100060#include <asm/firmware.h>
Paul Mackerrasf78541d2005-10-28 22:53:37 +100061#include <asm/xmon.h>
David Gibsondcad47f2005-11-07 09:49:43 +110062#include <asm/udbg.h>
Michael Ellerman593e5372005-11-12 00:06:06 +110063#include <asm/kexec.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100064
Stephen Rothwell66ba1352005-11-09 11:01:06 +110065#include "setup.h"
66
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100067#ifdef DEBUG
68#define DBG(fmt...) udbg_printf(fmt)
69#else
70#define DBG(fmt...)
71#endif
72
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100073int have_of = 1;
74int boot_cpuid = 0;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100075u64 ppc64_pft_size;
76
Olof Johanssondabcafd2005-12-08 19:40:17 -060077/* Pick defaults since we might want to patch instructions
78 * before we've read this from the device tree.
79 */
80struct ppc64_caches ppc64_caches = {
Olof Johansson5a2fe382006-09-06 14:34:41 -050081 .dline_size = 0x40,
82 .log_dline_size = 6,
83 .iline_size = 0x40,
84 .log_iline_size = 6
Olof Johanssondabcafd2005-12-08 19:40:17 -060085};
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100086EXPORT_SYMBOL_GPL(ppc64_caches);
87
88/*
89 * These are used in binfmt_elf.c to put aux entries on the stack
90 * for each elf executable being started.
91 */
92int dcache_bsize;
93int icache_bsize;
94int ucache_bsize;
95
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100096#ifdef CONFIG_SMP
97
98static int smt_enabled_cmdline;
99
100/* Look for ibm,smt-enabled OF option */
101static void check_smt_enabled(void)
102{
103 struct device_node *dn;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000104 const char *smt_option;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000105
106 /* Allow the command line to overrule the OF option */
107 if (smt_enabled_cmdline)
108 return;
109
110 dn = of_find_node_by_path("/options");
111
112 if (dn) {
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000113 smt_option = of_get_property(dn, "ibm,smt-enabled", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000114
115 if (smt_option) {
116 if (!strcmp(smt_option, "on"))
117 smt_enabled_at_boot = 1;
118 else if (!strcmp(smt_option, "off"))
119 smt_enabled_at_boot = 0;
120 }
121 }
122}
123
124/* Look for smt-enabled= cmdline option */
125static int __init early_smt_enabled(char *p)
126{
127 smt_enabled_cmdline = 1;
128
129 if (!p)
130 return 0;
131
132 if (!strcmp(p, "on") || !strcmp(p, "1"))
133 smt_enabled_at_boot = 1;
134 else if (!strcmp(p, "off") || !strcmp(p, "0"))
135 smt_enabled_at_boot = 0;
136
137 return 0;
138}
139early_param("smt-enabled", early_smt_enabled);
140
Paul Mackerras5ad57072005-11-05 10:33:55 +1100141#else
142#define check_smt_enabled()
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000143#endif /* CONFIG_SMP */
144
Michael Ellerman4ba99b92006-06-23 18:20:09 +1000145/* Put the paca pointer into r13 and SPRG3 */
146void __init setup_paca(int cpu)
147{
148 local_paca = &paca[cpu];
149 mtspr(SPRN_SPRG3, local_paca);
150}
151
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000152/*
153 * Early initialization entry point. This is called by head.S
154 * with MMU translation disabled. We rely on the "feature" of
155 * the CPU that ignores the top 2 bits of the address in real
156 * mode so we can access kernel globals normally provided we
157 * only toy with things in the RMO region. From here, we do
158 * some early parsing of the device-tree to setup out LMB
159 * data structures, and allocate & initialize the hash table
160 * and segment tables so we can start running with translation
161 * enabled.
162 *
163 * It is this function which will call the probe() callback of
164 * the various platform types and copy the matching one to the
165 * global ppc_md structure. Your platform can eventually do
166 * some very early initializations from the probe() routine, but
167 * this is not recommended, be very careful as, for example, the
168 * device-tree is not accessible via normal means at this point.
169 */
170
171void __init early_setup(unsigned long dt_ptr)
172{
Benjamin Herrenschmidt24d96492008-05-07 10:00:56 +1000173 /* -------- printk is _NOT_ safe to use here ! ------- */
174
Tony Breeds90035fe2008-04-24 13:43:49 +1000175 /* Fill in any unititialised pacas */
176 initialise_pacas();
177
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000178 /* Identify CPU type */
Paul Mackerras974a76f2006-11-10 20:38:53 +1100179 identify_cpu(0, mfspr(SPRN_PVR));
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000180
Michael Ellerman33dbcf72006-06-28 13:18:53 +1000181 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
182 setup_paca(0);
183
Benjamin Herrenschmidt945feb12008-04-17 14:35:01 +1000184 /* Initialize lockdep early or else spinlocks will blow */
185 lockdep_init();
186
Benjamin Herrenschmidt24d96492008-05-07 10:00:56 +1000187 /* -------- printk is now safe to use ------- */
188
Benjamin Herrenschmidtf2fd2512008-05-07 10:25:34 +1000189 /* Enable early debugging if any specified (see udbg.h) */
190 udbg_early_init();
191
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100192 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000193
194 /*
Linas Vepstas3c607ce2007-09-07 03:47:29 +1000195 * Do early initialization using the flattened device
196 * tree, such as retrieving the physical memory map or
197 * calculating/retrieving the hash table size.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000198 */
199 early_init_devtree(__va(dt_ptr));
200
Anton Blanchard4df20462006-03-25 17:25:17 +1100201 /* Now we know the logical id of our boot cpu, setup the paca. */
Michael Ellerman4ba99b92006-06-23 18:20:09 +1000202 setup_paca(boot_cpuid);
Anton Blanchard4df20462006-03-25 17:25:17 +1100203
204 /* Fix up paca fields required for the boot cpu */
205 get_paca()->cpu_start = 1;
206 get_paca()->stab_real = __pa((u64)&initial_stab);
207 get_paca()->stab_addr = (u64)&initial_stab;
208
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100209 /* Probe the machine type */
210 probe_machine();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000211
Michael Ellerman47310412006-05-17 18:00:49 +1000212 setup_kdump_trampoline();
Michael Ellerman0cc47462005-12-04 18:39:37 +1100213
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000214 DBG("Found, Initializing memory management...\n");
215
216 /*
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000217 * Initialize the MMU Hash table and create the linear mapping
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100218 * of memory. Has to be done before stab/slb initialization as
219 * this is currently where the page size encoding is obtained
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000220 */
221 htab_initialize();
222
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100223 /*
224 * Initialize stab / SLB management except on iSeries
225 */
Stephen Rothwell856d08e2006-04-02 02:45:04 +1000226 if (cpu_has_feature(CPU_FTR_SLB))
227 slb_initialize();
228 else if (!firmware_has_feature(FW_FEATURE_ISERIES))
229 stab_initialize(get_paca()->stab_real);
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100230
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000231 DBG(" <- early_setup()\n");
232}
233
Paul Mackerras799d6042005-11-10 13:37:51 +1100234#ifdef CONFIG_SMP
235void early_setup_secondary(void)
236{
237 struct paca_struct *lpaca = get_paca();
238
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000239 /* Mark interrupts enabled in PACA */
240 lpaca->soft_enabled = 0;
Paul Mackerras799d6042005-11-10 13:37:51 +1100241
242 /* Initialize hash table for that CPU */
243 htab_initialize_secondary();
244
245 /* Initialize STAB/SLB. We use a virtual address as it works
246 * in real mode on pSeries and we want a virutal address on
247 * iSeries anyway
248 */
249 if (cpu_has_feature(CPU_FTR_SLB))
250 slb_initialize();
251 else
252 stab_initialize(lpaca->stab_addr);
253}
254
255#endif /* CONFIG_SMP */
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000256
Michael Ellermanb8f51022005-11-04 12:09:42 +1100257#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
Paul Mackerras1f6a93e2008-08-30 11:40:24 +1000258extern unsigned long __secondary_hold_spinloop;
259extern void generic_secondary_smp_init(void);
260
Michael Ellermanb8f51022005-11-04 12:09:42 +1100261void smp_release_cpus(void)
262{
Michael Ellerman758438a2005-12-05 15:49:00 -0600263 unsigned long *ptr;
Michael Ellermanb8f51022005-11-04 12:09:42 +1100264
265 DBG(" -> smp_release_cpus()\n");
266
267 /* All secondary cpus are spinning on a common spinloop, release them
268 * all now so they can start to spin on their individual paca
269 * spinloops. For non SMP kernels, the secondary cpus never get out
270 * of the common spinloop.
Paul Mackerras1f6a93e2008-08-30 11:40:24 +1000271 */
Michael Ellermanb8f51022005-11-04 12:09:42 +1100272
Michael Ellerman758438a2005-12-05 15:49:00 -0600273 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
274 - PHYSICAL_START);
Paul Mackerras1f6a93e2008-08-30 11:40:24 +1000275 *ptr = __pa(generic_secondary_smp_init);
Michael Ellermanb8f51022005-11-04 12:09:42 +1100276 mb();
277
278 DBG(" <- smp_release_cpus()\n");
279}
280#endif /* CONFIG_SMP || CONFIG_KEXEC */
281
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000282/*
Paul Mackerras799d6042005-11-10 13:37:51 +1100283 * Initialize some remaining members of the ppc64_caches and systemcfg
284 * structures
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000285 * (at least until we get rid of them completely). This is mostly some
286 * cache informations about the CPU that will be used by cache flush
287 * routines and/or provided to userland
288 */
289static void __init initialize_cache_info(void)
290{
291 struct device_node *np;
292 unsigned long num_cpus = 0;
293
294 DBG(" -> initialize_cache_info()\n");
295
296 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
297 num_cpus += 1;
298
299 /* We're assuming *all* of the CPUs have the same
300 * d-cache and i-cache sizes... -Peter
301 */
302
303 if ( num_cpus == 1 ) {
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000304 const u32 *sizep, *lsizep;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000305 u32 size, lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000306
307 size = 0;
308 lsize = cur_cpu_spec->dcache_bsize;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000309 sizep = of_get_property(np, "d-cache-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000310 if (sizep != NULL)
311 size = *sizep;
Benjamin Herrenschmidt20474ab2007-10-28 08:49:28 +1100312 lsizep = of_get_property(np, "d-cache-block-size", NULL);
313 /* fallback if block size missing */
314 if (lsizep == NULL)
315 lsizep = of_get_property(np, "d-cache-line-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000316 if (lsizep != NULL)
317 lsize = *lsizep;
318 if (sizep == 0 || lsizep == 0)
319 DBG("Argh, can't find dcache properties ! "
320 "sizep: %p, lsizep: %p\n", sizep, lsizep);
321
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100322 ppc64_caches.dsize = size;
323 ppc64_caches.dline_size = lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000324 ppc64_caches.log_dline_size = __ilog2(lsize);
325 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
326
327 size = 0;
328 lsize = cur_cpu_spec->icache_bsize;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000329 sizep = of_get_property(np, "i-cache-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000330 if (sizep != NULL)
331 size = *sizep;
Benjamin Herrenschmidt20474ab2007-10-28 08:49:28 +1100332 lsizep = of_get_property(np, "i-cache-block-size", NULL);
333 if (lsizep == NULL)
334 lsizep = of_get_property(np, "i-cache-line-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000335 if (lsizep != NULL)
336 lsize = *lsizep;
337 if (sizep == 0 || lsizep == 0)
338 DBG("Argh, can't find icache properties ! "
339 "sizep: %p, lsizep: %p\n", sizep, lsizep);
340
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100341 ppc64_caches.isize = size;
342 ppc64_caches.iline_size = lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000343 ppc64_caches.log_iline_size = __ilog2(lsize);
344 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
345 }
346 }
347
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000348 DBG(" <- initialize_cache_info()\n");
349}
350
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000351
352/*
353 * Do some initial setup of the system. The parameters are those which
354 * were passed in from the bootloader.
355 */
356void __init setup_system(void)
357{
358 DBG(" -> setup_system()\n");
359
Tony Breeds826ea8f2007-07-18 16:17:48 +1000360 /* Apply the CPUs-specific and firmware specific fixups to kernel
361 * text (nop out sections not relevant to this CPU or this firmware)
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000362 */
Benjamin Herrenschmidt0909c8c2006-10-20 11:47:18 +1000363 do_feature_fixups(cur_cpu_spec->cpu_features,
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000364 &__start___ftr_fixup, &__stop___ftr_fixup);
Tony Breeds826ea8f2007-07-18 16:17:48 +1000365 do_feature_fixups(powerpc_firmware_features,
366 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
Kumar Gala2d1b2022008-07-02 01:16:40 +1000367 do_lwsync_fixups(cur_cpu_spec->cpu_features,
368 &__start___lwsync_fixup, &__stop___lwsync_fixup);
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000369
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000370 /*
371 * Unflatten the device-tree passed by prom_init or kexec
372 */
373 unflatten_device_tree();
374
375 /*
376 * Fill the ppc64_caches & systemcfg structures with informations
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000377 * retrieved from the device-tree.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000378 */
379 initialize_cache_info();
380
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000381 /*
382 * Initialize irq remapping subsystem
383 */
384 irq_early_init();
385
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000386#ifdef CONFIG_PPC_RTAS
387 /*
388 * Initialize RTAS if available
389 */
390 rtas_initialize();
391#endif /* CONFIG_PPC_RTAS */
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000392
393 /*
394 * Check if we have an initrd provided via the device-tree
395 */
396 check_for_initrd();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000397
398 /*
399 * Do some platform specific early initializations, that includes
400 * setting up the hash table pointers. It also sets up some interrupt-mapping
401 * related options that will be used by finish_device_tree()
402 */
Geoff Levand57744ea2006-11-10 12:01:02 -0800403 if (ppc_md.init_early)
404 ppc_md.init_early();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000405
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100406 /*
407 * We can discover serial ports now since the above did setup the
408 * hash table management for us, thus ioremap works. We do that early
409 * so that further code can be debugged
410 */
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100411 find_legacy_serial_ports();
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100412
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000413 /*
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000414 * Register early console
415 */
416 register_early_udbg_console();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000417
Michael Ellerman476792832006-10-03 14:12:08 +1000418 /*
419 * Initialize xmon
420 */
421 xmon_setup();
Michael Ellerman480f6f32006-05-17 18:00:41 +1000422
Paul Mackerras5ad57072005-11-05 10:33:55 +1100423 check_smt_enabled();
424 smp_setup_cpu_maps();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000425
Michael Ellermanf018b362006-02-16 14:13:50 +1100426#ifdef CONFIG_SMP
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000427 /* Release secondary cpus out of their spinloops at 0x60 now that
428 * we can map physical -> logical CPU ids
429 */
430 smp_release_cpus();
Michael Ellermanf018b362006-02-16 14:13:50 +1100431#endif
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000432
Serge E. Hallyn96b644b2006-10-02 02:18:13 -0700433 printk("Starting Linux PPC64 %s\n", init_utsname()->version);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000434
435 printk("-----------------------------------------------------\n");
436 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100437 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
Anton Blanchard9697add2007-10-15 05:33:17 +1000438 if (ppc64_caches.dline_size != 0x80)
439 printk("ppc64_caches.dcache_line_size = 0x%x\n",
440 ppc64_caches.dline_size);
441 if (ppc64_caches.iline_size != 0x80)
442 printk("ppc64_caches.icache_line_size = 0x%x\n",
443 ppc64_caches.iline_size);
444 if (htab_address)
445 printk("htab_address = 0x%p\n", htab_address);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000446 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
Michael Neulingb1605442008-10-22 19:39:49 +0000447 if (PHYSICAL_START > 0)
448 printk("physical_start = 0x%lx\n",
449 PHYSICAL_START);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000450 printk("-----------------------------------------------------\n");
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000451
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000452 DBG(" <- setup_system()\n");
453}
454
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000455#ifdef CONFIG_IRQSTACKS
456static void __init irqstack_early_init(void)
457{
458 unsigned int i;
459
460 /*
461 * interrupt stacks must be under 256MB, we cannot afford to take
462 * SLB misses on them.
463 */
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -0800464 for_each_possible_cpu(i) {
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100465 softirq_ctx[i] = (struct thread_info *)
466 __va(lmb_alloc_base(THREAD_SIZE,
467 THREAD_SIZE, 0x10000000));
468 hardirq_ctx[i] = (struct thread_info *)
469 __va(lmb_alloc_base(THREAD_SIZE,
470 THREAD_SIZE, 0x10000000));
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000471 }
472}
473#else
474#define irqstack_early_init()
475#endif
476
477/*
478 * Stack space used when we detect a bad kernel stack pointer, and
479 * early in SMP boots before relocation is enabled.
480 */
481static void __init emergency_stack_init(void)
482{
483 unsigned long limit;
484 unsigned int i;
485
486 /*
487 * Emergency stacks must be under 256MB, we cannot afford to take
488 * SLB misses on them. The ABI also requires them to be 128-byte
489 * aligned.
490 *
491 * Since we use these as temporary stacks during secondary CPU
492 * bringup, we need to get at them in real mode. This means they
493 * must also be within the RMO region.
494 */
495 limit = min(0x10000000UL, lmb.rmo_size);
496
Michael Ellerman3243d872008-04-30 13:21:45 +1000497 for_each_possible_cpu(i) {
498 unsigned long sp;
499 sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
500 sp += THREAD_SIZE;
501 paca[i].emergency_sp = __va(sp);
502 }
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000503}
504
505/*
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000506 * Called into from start_kernel, after lock_kernel has been called.
507 * Initializes bootmem, which is unsed to manage page allocation until
508 * mem_init is called.
509 */
510void __init setup_arch(char **cmdline_p)
511{
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000512 ppc64_boot_msg(0x12, "Setup Arch");
513
514 *cmdline_p = cmd_line;
515
516 /*
517 * Set cache line size based on type of cpu as a default.
518 * Systems with OF can look in the properties on the cpu node(s)
519 * for a possibly more accurate value.
520 */
521 dcache_bsize = ppc64_caches.dline_size;
522 icache_bsize = ppc64_caches.iline_size;
523
524 /* reboot on panic */
525 panic_timeout = 180;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000526
527 if (ppc_md.panic)
Kumar Gala7e990262006-05-05 00:02:08 -0500528 setup_panic();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000529
Kumar Gala4846c5d2008-04-16 05:52:26 +1000530 init_mm.start_code = (unsigned long)_stext;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000531 init_mm.end_code = (unsigned long) _etext;
532 init_mm.end_data = (unsigned long) _edata;
533 init_mm.brk = klimit;
534
535 irqstack_early_init();
536 emergency_stack_init();
537
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000538 stabs_alloc();
539
540 /* set up the bootmem stuff with available memory */
541 do_init_bootmem();
542 sparse_init();
543
Paul Mackerras04580602005-10-20 21:00:20 +1000544#ifdef CONFIG_DUMMY_CONSOLE
545 conswitchp = &dummy_con;
546#endif
547
Grant Likely38db7e72007-10-11 04:48:18 +1000548 if (ppc_md.setup_arch)
549 ppc_md.setup_arch();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000550
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000551 paging_init();
552 ppc64_boot_msg(0x15, "Setup Done");
553}
554
555
556/* ToDo: do something useful if ppc_md is not yet setup. */
557#define PPC64_LINUX_FUNCTION 0x0f000000
558#define PPC64_IPL_MESSAGE 0xc0000000
559#define PPC64_TERM_MESSAGE 0xb0000000
560
561static void ppc64_do_msg(unsigned int src, const char *msg)
562{
563 if (ppc_md.progress) {
564 char buf[128];
565
566 sprintf(buf, "%08X\n", src);
567 ppc_md.progress(buf, 0);
568 snprintf(buf, 128, "%s", msg);
569 ppc_md.progress(buf, 0);
570 }
571}
572
573/* Print a boot progress message. */
574void ppc64_boot_msg(unsigned int src, const char *msg)
575{
576 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
577 printk("[boot]%04x %s\n", src, msg);
578}
579
580/* Print a termination message (print only -- does not stop the kernel) */
581void ppc64_terminate_msg(unsigned int src, const char *msg)
582{
583 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
584 printk("[terminate]%04x %s\n", src, msg);
585}
586
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000587void cpu_die(void)
588{
589 if (ppc_md.cpu_die)
590 ppc_md.cpu_die();
591}
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100592
593#ifdef CONFIG_SMP
594void __init setup_per_cpu_areas(void)
595{
596 int i;
597 unsigned long size;
598 char *ptr;
599
600 /* Copy section for each CPU (we discard the original) */
Jeremy Fitzhardingeb6e35902007-05-02 19:27:12 +0200601 size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100602#ifdef CONFIG_MODULES
603 if (size < PERCPU_ENOUGH_ROOM)
604 size = PERCPU_ENOUGH_ROOM;
605#endif
606
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -0800607 for_each_possible_cpu(i) {
Jeremy Fitzhardingeb6e35902007-05-02 19:27:12 +0200608 ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100609 if (!ptr)
610 panic("Cannot allocate cpu data for CPU %d\n", i);
611
612 paca[i].data_offset = ptr - __per_cpu_start;
613 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
614 }
615}
616#endif
Benjamin Herrenschmidt4cb3cee2006-11-11 17:25:10 +1100617
618
619#ifdef CONFIG_PPC_INDIRECT_IO
620struct ppc_pci_io ppc_pci_io;
621EXPORT_SYMBOL(ppc_pci_io);
622#endif /* CONFIG_PPC_INDIRECT_IO */
623