blob: d8bd2161e7388c55afcb53f77d2c03504cf073ff [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 boot_cpuid = 0;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100074u64 ppc64_pft_size;
75
Olof Johanssondabcafd2005-12-08 19:40:17 -060076/* Pick defaults since we might want to patch instructions
77 * before we've read this from the device tree.
78 */
79struct ppc64_caches ppc64_caches = {
Olof Johansson5a2fe382006-09-06 14:34:41 -050080 .dline_size = 0x40,
81 .log_dline_size = 6,
82 .iline_size = 0x40,
83 .log_iline_size = 6
Olof Johanssondabcafd2005-12-08 19:40:17 -060084};
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100085EXPORT_SYMBOL_GPL(ppc64_caches);
86
87/*
88 * These are used in binfmt_elf.c to put aux entries on the stack
89 * for each elf executable being started.
90 */
91int dcache_bsize;
92int icache_bsize;
93int ucache_bsize;
94
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100095#ifdef CONFIG_SMP
96
97static int smt_enabled_cmdline;
98
99/* Look for ibm,smt-enabled OF option */
100static void check_smt_enabled(void)
101{
102 struct device_node *dn;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000103 const char *smt_option;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000104
105 /* Allow the command line to overrule the OF option */
106 if (smt_enabled_cmdline)
107 return;
108
109 dn = of_find_node_by_path("/options");
110
111 if (dn) {
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000112 smt_option = of_get_property(dn, "ibm,smt-enabled", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000113
114 if (smt_option) {
115 if (!strcmp(smt_option, "on"))
116 smt_enabled_at_boot = 1;
117 else if (!strcmp(smt_option, "off"))
118 smt_enabled_at_boot = 0;
119 }
120 }
121}
122
123/* Look for smt-enabled= cmdline option */
124static int __init early_smt_enabled(char *p)
125{
126 smt_enabled_cmdline = 1;
127
128 if (!p)
129 return 0;
130
131 if (!strcmp(p, "on") || !strcmp(p, "1"))
132 smt_enabled_at_boot = 1;
133 else if (!strcmp(p, "off") || !strcmp(p, "0"))
134 smt_enabled_at_boot = 0;
135
136 return 0;
137}
138early_param("smt-enabled", early_smt_enabled);
139
Paul Mackerras5ad57072005-11-05 10:33:55 +1100140#else
141#define check_smt_enabled()
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000142#endif /* CONFIG_SMP */
143
Michael Ellerman4ba99b92006-06-23 18:20:09 +1000144/* Put the paca pointer into r13 and SPRG3 */
145void __init setup_paca(int cpu)
146{
147 local_paca = &paca[cpu];
148 mtspr(SPRN_SPRG3, local_paca);
149}
150
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000151/*
152 * Early initialization entry point. This is called by head.S
153 * with MMU translation disabled. We rely on the "feature" of
154 * the CPU that ignores the top 2 bits of the address in real
155 * mode so we can access kernel globals normally provided we
156 * only toy with things in the RMO region. From here, we do
157 * some early parsing of the device-tree to setup out LMB
158 * data structures, and allocate & initialize the hash table
159 * and segment tables so we can start running with translation
160 * enabled.
161 *
162 * It is this function which will call the probe() callback of
163 * the various platform types and copy the matching one to the
164 * global ppc_md structure. Your platform can eventually do
165 * some very early initializations from the probe() routine, but
166 * this is not recommended, be very careful as, for example, the
167 * device-tree is not accessible via normal means at this point.
168 */
169
170void __init early_setup(unsigned long dt_ptr)
171{
Benjamin Herrenschmidt24d96492008-05-07 10:00:56 +1000172 /* -------- printk is _NOT_ safe to use here ! ------- */
173
Tony Breeds90035fe2008-04-24 13:43:49 +1000174 /* Fill in any unititialised pacas */
175 initialise_pacas();
176
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000177 /* Identify CPU type */
Paul Mackerras974a76f2006-11-10 20:38:53 +1100178 identify_cpu(0, mfspr(SPRN_PVR));
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000179
Michael Ellerman33dbcf72006-06-28 13:18:53 +1000180 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
181 setup_paca(0);
182
Benjamin Herrenschmidt945feb12008-04-17 14:35:01 +1000183 /* Initialize lockdep early or else spinlocks will blow */
184 lockdep_init();
185
Benjamin Herrenschmidt24d96492008-05-07 10:00:56 +1000186 /* -------- printk is now safe to use ------- */
187
Benjamin Herrenschmidtf2fd2512008-05-07 10:25:34 +1000188 /* Enable early debugging if any specified (see udbg.h) */
189 udbg_early_init();
190
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100191 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000192
193 /*
Linas Vepstas3c607ce2007-09-07 03:47:29 +1000194 * Do early initialization using the flattened device
195 * tree, such as retrieving the physical memory map or
196 * calculating/retrieving the hash table size.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000197 */
198 early_init_devtree(__va(dt_ptr));
199
Anton Blanchard4df20462006-03-25 17:25:17 +1100200 /* Now we know the logical id of our boot cpu, setup the paca. */
Michael Ellerman4ba99b92006-06-23 18:20:09 +1000201 setup_paca(boot_cpuid);
Anton Blanchard4df20462006-03-25 17:25:17 +1100202
203 /* Fix up paca fields required for the boot cpu */
204 get_paca()->cpu_start = 1;
205 get_paca()->stab_real = __pa((u64)&initial_stab);
206 get_paca()->stab_addr = (u64)&initial_stab;
207
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100208 /* Probe the machine type */
209 probe_machine();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000210
Michael Ellerman47310412006-05-17 18:00:49 +1000211 setup_kdump_trampoline();
Michael Ellerman0cc47462005-12-04 18:39:37 +1100212
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000213 DBG("Found, Initializing memory management...\n");
214
215 /*
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000216 * Initialize the MMU Hash table and create the linear mapping
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100217 * of memory. Has to be done before stab/slb initialization as
218 * this is currently where the page size encoding is obtained
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000219 */
220 htab_initialize();
221
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100222 /*
223 * Initialize stab / SLB management except on iSeries
224 */
Stephen Rothwell856d08e2006-04-02 02:45:04 +1000225 if (cpu_has_feature(CPU_FTR_SLB))
226 slb_initialize();
227 else if (!firmware_has_feature(FW_FEATURE_ISERIES))
228 stab_initialize(get_paca()->stab_real);
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100229
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000230 DBG(" <- early_setup()\n");
231}
232
Paul Mackerras799d6042005-11-10 13:37:51 +1100233#ifdef CONFIG_SMP
234void early_setup_secondary(void)
235{
236 struct paca_struct *lpaca = get_paca();
237
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000238 /* Mark interrupts enabled in PACA */
239 lpaca->soft_enabled = 0;
Paul Mackerras799d6042005-11-10 13:37:51 +1100240
241 /* Initialize hash table for that CPU */
242 htab_initialize_secondary();
243
244 /* Initialize STAB/SLB. We use a virtual address as it works
245 * in real mode on pSeries and we want a virutal address on
246 * iSeries anyway
247 */
248 if (cpu_has_feature(CPU_FTR_SLB))
249 slb_initialize();
250 else
251 stab_initialize(lpaca->stab_addr);
252}
253
254#endif /* CONFIG_SMP */
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000255
Michael Ellermanb8f51022005-11-04 12:09:42 +1100256#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
Paul Mackerras1f6a93e2008-08-30 11:40:24 +1000257extern unsigned long __secondary_hold_spinloop;
258extern void generic_secondary_smp_init(void);
259
Michael Ellermanb8f51022005-11-04 12:09:42 +1100260void smp_release_cpus(void)
261{
Michael Ellerman758438a2005-12-05 15:49:00 -0600262 unsigned long *ptr;
Michael Ellermanb8f51022005-11-04 12:09:42 +1100263
264 DBG(" -> smp_release_cpus()\n");
265
266 /* All secondary cpus are spinning on a common spinloop, release them
267 * all now so they can start to spin on their individual paca
268 * spinloops. For non SMP kernels, the secondary cpus never get out
269 * of the common spinloop.
Paul Mackerras1f6a93e2008-08-30 11:40:24 +1000270 */
Michael Ellermanb8f51022005-11-04 12:09:42 +1100271
Michael Ellerman758438a2005-12-05 15:49:00 -0600272 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
273 - PHYSICAL_START);
Paul Mackerras1f6a93e2008-08-30 11:40:24 +1000274 *ptr = __pa(generic_secondary_smp_init);
Michael Ellermanb8f51022005-11-04 12:09:42 +1100275 mb();
276
277 DBG(" <- smp_release_cpus()\n");
278}
279#endif /* CONFIG_SMP || CONFIG_KEXEC */
280
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000281/*
Paul Mackerras799d6042005-11-10 13:37:51 +1100282 * Initialize some remaining members of the ppc64_caches and systemcfg
283 * structures
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000284 * (at least until we get rid of them completely). This is mostly some
285 * cache informations about the CPU that will be used by cache flush
286 * routines and/or provided to userland
287 */
288static void __init initialize_cache_info(void)
289{
290 struct device_node *np;
291 unsigned long num_cpus = 0;
292
293 DBG(" -> initialize_cache_info()\n");
294
295 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
296 num_cpus += 1;
297
298 /* We're assuming *all* of the CPUs have the same
299 * d-cache and i-cache sizes... -Peter
300 */
301
302 if ( num_cpus == 1 ) {
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000303 const u32 *sizep, *lsizep;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000304 u32 size, lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000305
306 size = 0;
307 lsize = cur_cpu_spec->dcache_bsize;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000308 sizep = of_get_property(np, "d-cache-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000309 if (sizep != NULL)
310 size = *sizep;
Benjamin Herrenschmidt20474ab2007-10-28 08:49:28 +1100311 lsizep = of_get_property(np, "d-cache-block-size", NULL);
312 /* fallback if block size missing */
313 if (lsizep == NULL)
314 lsizep = of_get_property(np, "d-cache-line-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000315 if (lsizep != NULL)
316 lsize = *lsizep;
317 if (sizep == 0 || lsizep == 0)
318 DBG("Argh, can't find dcache properties ! "
319 "sizep: %p, lsizep: %p\n", sizep, lsizep);
320
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100321 ppc64_caches.dsize = size;
322 ppc64_caches.dline_size = lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000323 ppc64_caches.log_dline_size = __ilog2(lsize);
324 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
325
326 size = 0;
327 lsize = cur_cpu_spec->icache_bsize;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000328 sizep = of_get_property(np, "i-cache-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000329 if (sizep != NULL)
330 size = *sizep;
Benjamin Herrenschmidt20474ab2007-10-28 08:49:28 +1100331 lsizep = of_get_property(np, "i-cache-block-size", NULL);
332 if (lsizep == NULL)
333 lsizep = of_get_property(np, "i-cache-line-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000334 if (lsizep != NULL)
335 lsize = *lsizep;
336 if (sizep == 0 || lsizep == 0)
337 DBG("Argh, can't find icache properties ! "
338 "sizep: %p, lsizep: %p\n", sizep, lsizep);
339
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100340 ppc64_caches.isize = size;
341 ppc64_caches.iline_size = lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000342 ppc64_caches.log_iline_size = __ilog2(lsize);
343 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
344 }
345 }
346
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000347 DBG(" <- initialize_cache_info()\n");
348}
349
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000350
351/*
352 * Do some initial setup of the system. The parameters are those which
353 * were passed in from the bootloader.
354 */
355void __init setup_system(void)
356{
357 DBG(" -> setup_system()\n");
358
Tony Breeds826ea8f2007-07-18 16:17:48 +1000359 /* Apply the CPUs-specific and firmware specific fixups to kernel
360 * text (nop out sections not relevant to this CPU or this firmware)
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000361 */
Benjamin Herrenschmidt0909c8c2006-10-20 11:47:18 +1000362 do_feature_fixups(cur_cpu_spec->cpu_features,
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000363 &__start___ftr_fixup, &__stop___ftr_fixup);
Benjamin Herrenschmidt7c03d652008-12-18 19:13:32 +0000364 do_feature_fixups(cur_cpu_spec->mmu_features,
365 &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup);
Tony Breeds826ea8f2007-07-18 16:17:48 +1000366 do_feature_fixups(powerpc_firmware_features,
367 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
Kumar Gala2d1b2022008-07-02 01:16:40 +1000368 do_lwsync_fixups(cur_cpu_spec->cpu_features,
369 &__start___lwsync_fixup, &__stop___lwsync_fixup);
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000370
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000371 /*
372 * Unflatten the device-tree passed by prom_init or kexec
373 */
374 unflatten_device_tree();
375
376 /*
377 * Fill the ppc64_caches & systemcfg structures with informations
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000378 * retrieved from the device-tree.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000379 */
380 initialize_cache_info();
381
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000382 /*
383 * Initialize irq remapping subsystem
384 */
385 irq_early_init();
386
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000387#ifdef CONFIG_PPC_RTAS
388 /*
389 * Initialize RTAS if available
390 */
391 rtas_initialize();
392#endif /* CONFIG_PPC_RTAS */
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000393
394 /*
395 * Check if we have an initrd provided via the device-tree
396 */
397 check_for_initrd();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000398
399 /*
400 * Do some platform specific early initializations, that includes
401 * setting up the hash table pointers. It also sets up some interrupt-mapping
402 * related options that will be used by finish_device_tree()
403 */
Geoff Levand57744ea2006-11-10 12:01:02 -0800404 if (ppc_md.init_early)
405 ppc_md.init_early();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000406
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100407 /*
408 * We can discover serial ports now since the above did setup the
409 * hash table management for us, thus ioremap works. We do that early
410 * so that further code can be debugged
411 */
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100412 find_legacy_serial_ports();
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100413
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000414 /*
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000415 * Register early console
416 */
417 register_early_udbg_console();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000418
Michael Ellerman476792832006-10-03 14:12:08 +1000419 /*
420 * Initialize xmon
421 */
422 xmon_setup();
Michael Ellerman480f6f32006-05-17 18:00:41 +1000423
Paul Mackerras5ad57072005-11-05 10:33:55 +1100424 check_smt_enabled();
425 smp_setup_cpu_maps();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000426
Michael Ellermanf018b362006-02-16 14:13:50 +1100427#ifdef CONFIG_SMP
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000428 /* Release secondary cpus out of their spinloops at 0x60 now that
429 * we can map physical -> logical CPU ids
430 */
431 smp_release_cpus();
Michael Ellermanf018b362006-02-16 14:13:50 +1100432#endif
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000433
Serge E. Hallyn96b644b2006-10-02 02:18:13 -0700434 printk("Starting Linux PPC64 %s\n", init_utsname()->version);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000435
436 printk("-----------------------------------------------------\n");
437 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100438 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
Anton Blanchard9697add2007-10-15 05:33:17 +1000439 if (ppc64_caches.dline_size != 0x80)
440 printk("ppc64_caches.dcache_line_size = 0x%x\n",
441 ppc64_caches.dline_size);
442 if (ppc64_caches.iline_size != 0x80)
443 printk("ppc64_caches.icache_line_size = 0x%x\n",
444 ppc64_caches.iline_size);
445 if (htab_address)
446 printk("htab_address = 0x%p\n", htab_address);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000447 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
Michael Neulingb1605442008-10-22 19:39:49 +0000448 if (PHYSICAL_START > 0)
449 printk("physical_start = 0x%lx\n",
450 PHYSICAL_START);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000451 printk("-----------------------------------------------------\n");
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000452
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000453 DBG(" <- setup_system()\n");
454}
455
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000456#ifdef CONFIG_IRQSTACKS
457static void __init irqstack_early_init(void)
458{
459 unsigned int i;
460
461 /*
462 * interrupt stacks must be under 256MB, we cannot afford to take
463 * SLB misses on them.
464 */
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -0800465 for_each_possible_cpu(i) {
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100466 softirq_ctx[i] = (struct thread_info *)
467 __va(lmb_alloc_base(THREAD_SIZE,
468 THREAD_SIZE, 0x10000000));
469 hardirq_ctx[i] = (struct thread_info *)
470 __va(lmb_alloc_base(THREAD_SIZE,
471 THREAD_SIZE, 0x10000000));
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000472 }
473}
474#else
475#define irqstack_early_init()
476#endif
477
478/*
479 * Stack space used when we detect a bad kernel stack pointer, and
480 * early in SMP boots before relocation is enabled.
481 */
482static void __init emergency_stack_init(void)
483{
484 unsigned long limit;
485 unsigned int i;
486
487 /*
488 * Emergency stacks must be under 256MB, we cannot afford to take
489 * SLB misses on them. The ABI also requires them to be 128-byte
490 * aligned.
491 *
492 * Since we use these as temporary stacks during secondary CPU
493 * bringup, we need to get at them in real mode. This means they
494 * must also be within the RMO region.
495 */
496 limit = min(0x10000000UL, lmb.rmo_size);
497
Michael Ellerman3243d872008-04-30 13:21:45 +1000498 for_each_possible_cpu(i) {
499 unsigned long sp;
500 sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
501 sp += THREAD_SIZE;
502 paca[i].emergency_sp = __va(sp);
503 }
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000504}
505
506/*
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000507 * Called into from start_kernel, after lock_kernel has been called.
508 * Initializes bootmem, which is unsed to manage page allocation until
509 * mem_init is called.
510 */
511void __init setup_arch(char **cmdline_p)
512{
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000513 ppc64_boot_msg(0x12, "Setup Arch");
514
515 *cmdline_p = cmd_line;
516
517 /*
518 * Set cache line size based on type of cpu as a default.
519 * Systems with OF can look in the properties on the cpu node(s)
520 * for a possibly more accurate value.
521 */
522 dcache_bsize = ppc64_caches.dline_size;
523 icache_bsize = ppc64_caches.iline_size;
524
525 /* reboot on panic */
526 panic_timeout = 180;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000527
528 if (ppc_md.panic)
Kumar Gala7e990262006-05-05 00:02:08 -0500529 setup_panic();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000530
Kumar Gala4846c5d2008-04-16 05:52:26 +1000531 init_mm.start_code = (unsigned long)_stext;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000532 init_mm.end_code = (unsigned long) _etext;
533 init_mm.end_data = (unsigned long) _edata;
534 init_mm.brk = klimit;
535
536 irqstack_early_init();
537 emergency_stack_init();
538
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000539 stabs_alloc();
540
541 /* set up the bootmem stuff with available memory */
542 do_init_bootmem();
543 sparse_init();
544
Paul Mackerras04580602005-10-20 21:00:20 +1000545#ifdef CONFIG_DUMMY_CONSOLE
546 conswitchp = &dummy_con;
547#endif
548
Grant Likely38db7e72007-10-11 04:48:18 +1000549 if (ppc_md.setup_arch)
550 ppc_md.setup_arch();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000551
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000552 paging_init();
553 ppc64_boot_msg(0x15, "Setup Done");
554}
555
556
557/* ToDo: do something useful if ppc_md is not yet setup. */
558#define PPC64_LINUX_FUNCTION 0x0f000000
559#define PPC64_IPL_MESSAGE 0xc0000000
560#define PPC64_TERM_MESSAGE 0xb0000000
561
562static void ppc64_do_msg(unsigned int src, const char *msg)
563{
564 if (ppc_md.progress) {
565 char buf[128];
566
567 sprintf(buf, "%08X\n", src);
568 ppc_md.progress(buf, 0);
569 snprintf(buf, 128, "%s", msg);
570 ppc_md.progress(buf, 0);
571 }
572}
573
574/* Print a boot progress message. */
575void ppc64_boot_msg(unsigned int src, const char *msg)
576{
577 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
578 printk("[boot]%04x %s\n", src, msg);
579}
580
581/* Print a termination message (print only -- does not stop the kernel) */
582void ppc64_terminate_msg(unsigned int src, const char *msg)
583{
584 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
585 printk("[terminate]%04x %s\n", src, msg);
586}
587
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000588void cpu_die(void)
589{
590 if (ppc_md.cpu_die)
591 ppc_md.cpu_die();
592}
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100593
594#ifdef CONFIG_SMP
595void __init setup_per_cpu_areas(void)
596{
597 int i;
598 unsigned long size;
599 char *ptr;
600
601 /* Copy section for each CPU (we discard the original) */
Jeremy Fitzhardingeb6e35902007-05-02 19:27:12 +0200602 size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100603#ifdef CONFIG_MODULES
604 if (size < PERCPU_ENOUGH_ROOM)
605 size = PERCPU_ENOUGH_ROOM;
606#endif
607
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -0800608 for_each_possible_cpu(i) {
Jeremy Fitzhardingeb6e35902007-05-02 19:27:12 +0200609 ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100610
611 paca[i].data_offset = ptr - __per_cpu_start;
612 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
613 }
614}
615#endif
Benjamin Herrenschmidt4cb3cee2006-11-11 17:25:10 +1100616
617
618#ifdef CONFIG_PPC_INDIRECT_IO
619struct ppc_pci_io ppc_pci_io;
620EXPORT_SYMBOL(ppc_pci_io);
621#endif /* CONFIG_PPC_INDIRECT_IO */
622