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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
Benjamin Herrenschmidt7191b612013-07-25 12:12:32 +100013#define DEBUG
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100014
Paul Gortmaker4b16f8e2011-07-22 18:24:23 -040015#include <linux/export.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100016#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>
Yinghai Lu95f72d12010-07-12 14:36:09 +100037#include <linux/memblock.h>
Becky Brucea6146882011-10-10 10:50:43 +000038#include <linux/hugetlb.h>
Anton Blancharda5d86252014-06-04 17:50:47 +100039#include <linux/memory.h>
Becky Brucea6146882011-10-10 10:50:43 +000040
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100041#include <asm/io.h>
Michael Ellerman0cc47462005-12-04 18:39:37 +110042#include <asm/kdump.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100043#include <asm/prom.h>
44#include <asm/processor.h>
45#include <asm/pgtable.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100046#include <asm/smp.h>
47#include <asm/elf.h>
48#include <asm/machdep.h>
49#include <asm/paca.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100050#include <asm/time.h>
51#include <asm/cputable.h>
52#include <asm/sections.h>
53#include <asm/btext.h>
54#include <asm/nvram.h>
55#include <asm/setup.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100056#include <asm/rtas.h>
57#include <asm/iommu.h>
58#include <asm/serial.h>
59#include <asm/cache.h>
60#include <asm/page.h>
61#include <asm/mmu.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100062#include <asm/firmware.h>
Paul Mackerrasf78541d2005-10-28 22:53:37 +100063#include <asm/xmon.h>
David Gibsondcad47f2005-11-07 09:49:43 +110064#include <asm/udbg.h>
Michael Ellerman593e5372005-11-12 00:06:06 +110065#include <asm/kexec.h>
Benjamin Herrenschmidt25d21ad2009-07-23 23:15:47 +000066#include <asm/mmu_context.h>
Kumar Galad36b4c42011-04-06 00:18:48 -050067#include <asm/code-patching.h>
Paul Mackerrasaa04b4c2011-06-29 00:25:44 +000068#include <asm/kvm_ppc.h>
Becky Brucea6146882011-10-10 10:50:43 +000069#include <asm/hugetlb.h>
Laurentiu TUDOR4e21b942013-07-03 17:13:15 +030070#include <asm/epapr_hcalls.h>
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100071
72#ifdef DEBUG
73#define DBG(fmt...) udbg_printf(fmt)
74#else
75#define DBG(fmt...)
76#endif
77
Chen Gang8246aca2013-03-20 14:30:12 +080078int spinning_secondaries;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100079u64 ppc64_pft_size;
80
Olof Johanssondabcafd2005-12-08 19:40:17 -060081/* Pick defaults since we might want to patch instructions
82 * before we've read this from the device tree.
83 */
84struct ppc64_caches ppc64_caches = {
Olof Johansson5a2fe382006-09-06 14:34:41 -050085 .dline_size = 0x40,
86 .log_dline_size = 6,
87 .iline_size = 0x40,
88 .log_iline_size = 6
Olof Johanssondabcafd2005-12-08 19:40:17 -060089};
Paul Mackerras40ef8cb2005-10-10 22:50:37 +100090EXPORT_SYMBOL_GPL(ppc64_caches);
91
92/*
93 * These are used in binfmt_elf.c to put aux entries on the stack
94 * for each elf executable being started.
95 */
96int dcache_bsize;
97int icache_bsize;
98int ucache_bsize;
99
Scott Wood28efc352013-10-11 19:22:38 -0500100#if defined(CONFIG_PPC_BOOK3E) && defined(CONFIG_SMP)
101static void setup_tlb_core_data(void)
102{
103 int cpu;
104
Scott Wood82d86de2014-03-07 14:48:35 -0600105 BUILD_BUG_ON(offsetof(struct tlb_core_data, lock) != 0);
106
Scott Wood28efc352013-10-11 19:22:38 -0500107 for_each_possible_cpu(cpu) {
108 int first = cpu_first_thread_sibling(cpu);
109
110 paca[cpu].tcd_ptr = &paca[first].tcd;
111
112 /*
113 * If we have threads, we need either tlbsrx.
114 * or e6500 tablewalk mode, or else TLB handlers
115 * will be racy and could produce duplicate entries.
116 */
117 if (smt_enabled_at_boot >= 2 &&
118 !mmu_has_feature(MMU_FTR_USE_TLBRSRV) &&
119 book3e_htw_mode != PPC_HTW_E6500) {
120 /* Should we panic instead? */
121 WARN_ONCE("%s: unsupported MMU configuration -- expect problems\n",
122 __func__);
123 }
124 }
125}
126#else
127static void setup_tlb_core_data(void)
128{
129}
130#endif
131
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000132#ifdef CONFIG_SMP
133
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000134static char *smt_enabled_cmdline;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000135
136/* Look for ibm,smt-enabled OF option */
137static void check_smt_enabled(void)
138{
139 struct device_node *dn;
Jeremy Kerra7f67bd2006-07-12 15:35:54 +1000140 const char *smt_option;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000141
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000142 /* Default to enabling all threads */
143 smt_enabled_at_boot = threads_per_core;
144
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000145 /* Allow the command line to overrule the OF option */
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000146 if (smt_enabled_cmdline) {
147 if (!strcmp(smt_enabled_cmdline, "on"))
148 smt_enabled_at_boot = threads_per_core;
149 else if (!strcmp(smt_enabled_cmdline, "off"))
150 smt_enabled_at_boot = 0;
151 else {
Daniel Walter1618bd52014-08-08 14:24:01 -0700152 int smt;
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000153 int rc;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000154
Daniel Walter1618bd52014-08-08 14:24:01 -0700155 rc = kstrtoint(smt_enabled_cmdline, 10, &smt);
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000156 if (!rc)
157 smt_enabled_at_boot =
Daniel Walter1618bd52014-08-08 14:24:01 -0700158 min(threads_per_core, smt);
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000159 }
160 } else {
161 dn = of_find_node_by_path("/options");
162 if (dn) {
163 smt_option = of_get_property(dn, "ibm,smt-enabled",
164 NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000165
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000166 if (smt_option) {
167 if (!strcmp(smt_option, "on"))
168 smt_enabled_at_boot = threads_per_core;
169 else if (!strcmp(smt_option, "off"))
170 smt_enabled_at_boot = 0;
171 }
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000172
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000173 of_node_put(dn);
174 }
175 }
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000176}
177
178/* Look for smt-enabled= cmdline option */
179static int __init early_smt_enabled(char *p)
180{
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000181 smt_enabled_cmdline = p;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000182 return 0;
183}
184early_param("smt-enabled", early_smt_enabled);
185
Paul Mackerras5ad57072005-11-05 10:33:55 +1100186#else
187#define check_smt_enabled()
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000188#endif /* CONFIG_SMP */
189
Michael Ellerman25e13812013-02-12 14:44:50 +0000190/** Fix up paca fields required for the boot cpu */
191static void fixup_boot_paca(void)
192{
193 /* The boot cpu is started */
194 get_paca()->cpu_start = 1;
195 /* Allow percpu accesses to work until we setup percpu data */
196 get_paca()->data_offset = 0;
197}
198
Benjamin Herrenschmidt8f619b542014-03-28 13:36:30 +1100199static void cpu_ready_for_interrupts(void)
200{
201 /* Set IR and DR in PACA MSR */
202 get_paca()->kernel_msr = MSR_KERNEL;
203
Michael Ellerman633440f2014-07-17 15:29:45 +1000204 /*
205 * Enable AIL if supported, and we are in hypervisor mode. If we are
206 * not in hypervisor mode, we enable relocation-on interrupts later
207 * in pSeries_setup_arch() using the H_SET_MODE hcall.
208 */
Paul Mackerras18aa0da2014-04-11 16:43:35 +1000209 if (cpu_has_feature(CPU_FTR_HVMODE) &&
210 cpu_has_feature(CPU_FTR_ARCH_207S)) {
Benjamin Herrenschmidt8f619b542014-03-28 13:36:30 +1100211 unsigned long lpcr = mfspr(SPRN_LPCR);
212 mtspr(SPRN_LPCR, lpcr | LPCR_AIL_3);
213 }
214}
215
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000216/*
217 * Early initialization entry point. This is called by head.S
218 * with MMU translation disabled. We rely on the "feature" of
219 * the CPU that ignores the top 2 bits of the address in real
220 * mode so we can access kernel globals normally provided we
221 * only toy with things in the RMO region. From here, we do
Yinghai Lu95f72d12010-07-12 14:36:09 +1000222 * some early parsing of the device-tree to setup out MEMBLOCK
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000223 * data structures, and allocate & initialize the hash table
224 * and segment tables so we can start running with translation
225 * enabled.
226 *
227 * It is this function which will call the probe() callback of
228 * the various platform types and copy the matching one to the
229 * global ppc_md structure. Your platform can eventually do
230 * some very early initializations from the probe() routine, but
231 * this is not recommended, be very careful as, for example, the
232 * device-tree is not accessible via normal means at this point.
233 */
234
235void __init early_setup(unsigned long dt_ptr)
236{
Geoff Levand6a7e4062013-02-13 17:03:16 +0000237 static __initdata struct paca_struct boot_paca;
238
Benjamin Herrenschmidt24d96492008-05-07 10:00:56 +1000239 /* -------- printk is _NOT_ safe to use here ! ------- */
240
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000241 /* Identify CPU type */
Paul Mackerras974a76f2006-11-10 20:38:53 +1100242 identify_cpu(0, mfspr(SPRN_PVR));
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000243
Michael Ellerman33dbcf72006-06-28 13:18:53 +1000244 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000245 initialise_paca(&boot_paca, 0);
246 setup_paca(&boot_paca);
Michael Ellerman25e13812013-02-12 14:44:50 +0000247 fixup_boot_paca();
Michael Ellerman33dbcf72006-06-28 13:18:53 +1000248
Benjamin Herrenschmidt945feb12008-04-17 14:35:01 +1000249 /* Initialize lockdep early or else spinlocks will blow */
250 lockdep_init();
251
Benjamin Herrenschmidt24d96492008-05-07 10:00:56 +1000252 /* -------- printk is now safe to use ------- */
253
Benjamin Herrenschmidtf2fd2512008-05-07 10:25:34 +1000254 /* Enable early debugging if any specified (see udbg.h) */
255 udbg_early_init();
256
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100257 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000258
259 /*
Linas Vepstas3c607ce2007-09-07 03:47:29 +1000260 * Do early initialization using the flattened device
261 * tree, such as retrieving the physical memory map or
262 * calculating/retrieving the hash table size.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000263 */
264 early_init_devtree(__va(dt_ptr));
265
Laurentiu TUDOR4e21b942013-07-03 17:13:15 +0300266 epapr_paravirt_early_init();
267
Anton Blanchard4df20462006-03-25 17:25:17 +1100268 /* Now we know the logical id of our boot cpu, setup the paca. */
Michael Ellerman1426d5a2010-01-28 13:23:22 +0000269 setup_paca(&paca[boot_cpuid]);
Michael Ellerman25e13812013-02-12 14:44:50 +0000270 fixup_boot_paca();
Anton Blanchard4df20462006-03-25 17:25:17 +1100271
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100272 /* Probe the machine type */
273 probe_machine();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000274
Michael Ellerman47310412006-05-17 18:00:49 +1000275 setup_kdump_trampoline();
Michael Ellerman0cc47462005-12-04 18:39:37 +1100276
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000277 DBG("Found, Initializing memory management...\n");
278
Benjamin Herrenschmidt757c74d2009-03-19 19:34:16 +0000279 /* Initialize the hash table or TLB handling */
280 early_init_mmu();
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100281
Benjamin Herrenschmidta944a9c2014-03-28 13:36:29 +1100282 /*
283 * At this point, we can let interrupts switch to virtual mode
284 * (the MMU has been setup), so adjust the MSR in the PACA to
Benjamin Herrenschmidt8f619b542014-03-28 13:36:30 +1100285 * have IR and DR set and enable AIL if it exists
Benjamin Herrenschmidta944a9c2014-03-28 13:36:29 +1100286 */
Benjamin Herrenschmidt8f619b542014-03-28 13:36:30 +1100287 cpu_ready_for_interrupts();
Benjamin Herrenschmidta944a9c2014-03-28 13:36:29 +1100288
289 /* Reserve large chunks of memory for use by CMA for KVM */
Aneesh Kumar K.Vfa61a4e2013-07-02 11:15:16 +0530290 kvm_cma_reserve();
291
Becky Brucea6146882011-10-10 10:50:43 +0000292 /*
293 * Reserve any gigantic pages requested on the command line.
294 * memblock needs to have been initialized by the time this is
295 * called since this will reserve memory.
296 */
297 reserve_hugetlb_gpages();
298
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000299 DBG(" <- early_setup()\n");
Benjamin Herrenschmidt7191b612013-07-25 12:12:32 +1000300
301#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
302 /*
303 * This needs to be done *last* (after the above DBG() even)
304 *
305 * Right after we return from this function, we turn on the MMU
306 * which means the real-mode access trick that btext does will
307 * no longer work, it needs to switch to using a real MMU
308 * mapping. This call will ensure that it does
309 */
310 btext_map();
311#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000312}
313
Paul Mackerras799d6042005-11-10 13:37:51 +1100314#ifdef CONFIG_SMP
315void early_setup_secondary(void)
316{
Paul Mackerrasd04c56f2006-10-04 16:47:49 +1000317 /* Mark interrupts enabled in PACA */
Benjamin Herrenschmidt757c74d2009-03-19 19:34:16 +0000318 get_paca()->soft_enabled = 0;
Paul Mackerras799d6042005-11-10 13:37:51 +1100319
Benjamin Herrenschmidt757c74d2009-03-19 19:34:16 +0000320 /* Initialize the hash table or TLB handling */
321 early_init_mmu_secondary();
Benjamin Herrenschmidta944a9c2014-03-28 13:36:29 +1100322
323 /*
324 * At this point, we can let interrupts switch to virtual mode
325 * (the MMU has been setup), so adjust the MSR in the PACA to
326 * have IR and DR set.
327 */
Benjamin Herrenschmidt8f619b542014-03-28 13:36:30 +1100328 cpu_ready_for_interrupts();
Paul Mackerras799d6042005-11-10 13:37:51 +1100329}
330
331#endif /* CONFIG_SMP */
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000332
Michael Ellermanb8f51022005-11-04 12:09:42 +1100333#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
334void smp_release_cpus(void)
335{
Michael Ellerman758438a2005-12-05 15:49:00 -0600336 unsigned long *ptr;
Benjamin Herrenschmidt9d07bc82011-03-16 14:54:35 +1100337 int i;
Michael Ellermanb8f51022005-11-04 12:09:42 +1100338
339 DBG(" -> smp_release_cpus()\n");
340
341 /* All secondary cpus are spinning on a common spinloop, release them
342 * all now so they can start to spin on their individual paca
343 * spinloops. For non SMP kernels, the secondary cpus never get out
344 * of the common spinloop.
Paul Mackerras1f6a93e2008-08-30 11:40:24 +1000345 */
Michael Ellermanb8f51022005-11-04 12:09:42 +1100346
Michael Ellerman758438a2005-12-05 15:49:00 -0600347 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
348 - PHYSICAL_START);
Anton Blanchard2751b622014-03-11 11:54:06 +1100349 *ptr = ppc_function_entry(generic_secondary_smp_init);
Benjamin Herrenschmidt9d07bc82011-03-16 14:54:35 +1100350
351 /* And wait a bit for them to catch up */
352 for (i = 0; i < 100000; i++) {
353 mb();
354 HMT_low();
Matt Evans7ac87ab2011-05-25 18:09:12 +0000355 if (spinning_secondaries == 0)
Benjamin Herrenschmidt9d07bc82011-03-16 14:54:35 +1100356 break;
357 udelay(1);
358 }
Matt Evans7ac87ab2011-05-25 18:09:12 +0000359 DBG("spinning_secondaries = %d\n", spinning_secondaries);
Michael Ellermanb8f51022005-11-04 12:09:42 +1100360
361 DBG(" <- smp_release_cpus()\n");
362}
363#endif /* CONFIG_SMP || CONFIG_KEXEC */
364
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000365/*
Paul Mackerras799d6042005-11-10 13:37:51 +1100366 * Initialize some remaining members of the ppc64_caches and systemcfg
367 * structures
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000368 * (at least until we get rid of them completely). This is mostly some
369 * cache informations about the CPU that will be used by cache flush
370 * routines and/or provided to userland
371 */
372static void __init initialize_cache_info(void)
373{
374 struct device_node *np;
375 unsigned long num_cpus = 0;
376
377 DBG(" -> initialize_cache_info()\n");
378
Anton Blanchard94db7c52011-08-10 20:44:22 +0000379 for_each_node_by_type(np, "cpu") {
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000380 num_cpus += 1;
381
Anton Blancharddfbe93a2011-08-10 20:44:23 +0000382 /*
383 * We're assuming *all* of the CPUs have the same
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000384 * d-cache and i-cache sizes... -Peter
385 */
Anton Blancharddfbe93a2011-08-10 20:44:23 +0000386 if (num_cpus == 1) {
Anton Blanchard7946d5a2013-08-07 02:01:30 +1000387 const __be32 *sizep, *lsizep;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000388 u32 size, lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000389
390 size = 0;
391 lsize = cur_cpu_spec->dcache_bsize;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000392 sizep = of_get_property(np, "d-cache-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000393 if (sizep != NULL)
Anton Blanchard7946d5a2013-08-07 02:01:30 +1000394 size = be32_to_cpu(*sizep);
Anton Blancharddfbe93a2011-08-10 20:44:23 +0000395 lsizep = of_get_property(np, "d-cache-block-size",
396 NULL);
Benjamin Herrenschmidt20474ab2007-10-28 08:49:28 +1100397 /* fallback if block size missing */
398 if (lsizep == NULL)
Anton Blancharddfbe93a2011-08-10 20:44:23 +0000399 lsizep = of_get_property(np,
400 "d-cache-line-size",
401 NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000402 if (lsizep != NULL)
Anton Blanchard7946d5a2013-08-07 02:01:30 +1000403 lsize = be32_to_cpu(*lsizep);
Anton Blanchardb0d436c2013-08-07 02:01:24 +1000404 if (sizep == NULL || lsizep == NULL)
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000405 DBG("Argh, can't find dcache properties ! "
406 "sizep: %p, lsizep: %p\n", sizep, lsizep);
407
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100408 ppc64_caches.dsize = size;
409 ppc64_caches.dline_size = lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000410 ppc64_caches.log_dline_size = __ilog2(lsize);
411 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
412
413 size = 0;
414 lsize = cur_cpu_spec->icache_bsize;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000415 sizep = of_get_property(np, "i-cache-size", NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000416 if (sizep != NULL)
Anton Blanchard7946d5a2013-08-07 02:01:30 +1000417 size = be32_to_cpu(*sizep);
Anton Blancharddfbe93a2011-08-10 20:44:23 +0000418 lsizep = of_get_property(np, "i-cache-block-size",
419 NULL);
Benjamin Herrenschmidt20474ab2007-10-28 08:49:28 +1100420 if (lsizep == NULL)
Anton Blancharddfbe93a2011-08-10 20:44:23 +0000421 lsizep = of_get_property(np,
422 "i-cache-line-size",
423 NULL);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000424 if (lsizep != NULL)
Anton Blanchard7946d5a2013-08-07 02:01:30 +1000425 lsize = be32_to_cpu(*lsizep);
Anton Blanchardb0d436c2013-08-07 02:01:24 +1000426 if (sizep == NULL || lsizep == NULL)
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000427 DBG("Argh, can't find icache properties ! "
428 "sizep: %p, lsizep: %p\n", sizep, lsizep);
429
Benjamin Herrenschmidta7f290d2005-11-11 21:15:21 +1100430 ppc64_caches.isize = size;
431 ppc64_caches.iline_size = lsize;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000432 ppc64_caches.log_iline_size = __ilog2(lsize);
433 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
434 }
435 }
436
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000437 DBG(" <- initialize_cache_info()\n");
438}
439
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000440
441/*
442 * Do some initial setup of the system. The parameters are those which
443 * were passed in from the bootloader.
444 */
445void __init setup_system(void)
446{
447 DBG(" -> setup_system()\n");
448
Tony Breeds826ea8f2007-07-18 16:17:48 +1000449 /* Apply the CPUs-specific and firmware specific fixups to kernel
450 * text (nop out sections not relevant to this CPU or this firmware)
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000451 */
Benjamin Herrenschmidt0909c8c2006-10-20 11:47:18 +1000452 do_feature_fixups(cur_cpu_spec->cpu_features,
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000453 &__start___ftr_fixup, &__stop___ftr_fixup);
Benjamin Herrenschmidt7c03d652008-12-18 19:13:32 +0000454 do_feature_fixups(cur_cpu_spec->mmu_features,
455 &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup);
Tony Breeds826ea8f2007-07-18 16:17:48 +1000456 do_feature_fixups(powerpc_firmware_features,
457 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
Kumar Gala2d1b2022008-07-02 01:16:40 +1000458 do_lwsync_fixups(cur_cpu_spec->cpu_features,
459 &__start___lwsync_fixup, &__stop___lwsync_fixup);
Anton Blanchardd715e432011-11-14 12:54:47 +0000460 do_final_fixups();
Benjamin Herrenschmidt42c4aaa2006-10-24 16:42:40 +1000461
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000462 /*
463 * Unflatten the device-tree passed by prom_init or kexec
464 */
465 unflatten_device_tree();
466
467 /*
468 * Fill the ppc64_caches & systemcfg structures with informations
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000469 * retrieved from the device-tree.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000470 */
471 initialize_cache_info();
472
473#ifdef CONFIG_PPC_RTAS
474 /*
475 * Initialize RTAS if available
476 */
477 rtas_initialize();
478#endif /* CONFIG_PPC_RTAS */
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000479
480 /*
481 * Check if we have an initrd provided via the device-tree
482 */
483 check_for_initrd();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000484
485 /*
486 * Do some platform specific early initializations, that includes
487 * setting up the hash table pointers. It also sets up some interrupt-mapping
488 * related options that will be used by finish_device_tree()
489 */
Geoff Levand57744ea2006-11-10 12:01:02 -0800490 if (ppc_md.init_early)
491 ppc_md.init_early();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000492
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100493 /*
494 * We can discover serial ports now since the above did setup the
495 * hash table management for us, thus ioremap works. We do that early
496 * so that further code can be debugged
497 */
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100498 find_legacy_serial_ports();
Benjamin Herrenschmidt463ce0e2005-11-23 17:56:06 +1100499
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000500 /*
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000501 * Register early console
502 */
503 register_early_udbg_console();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000504
Michael Ellerman476792832006-10-03 14:12:08 +1000505 /*
506 * Initialize xmon
507 */
508 xmon_setup();
Michael Ellerman480f6f32006-05-17 18:00:41 +1000509
Paul Mackerras5ad57072005-11-05 10:33:55 +1100510 smp_setup_cpu_maps();
Nathan Fontenot954e6da2010-08-05 07:42:11 +0000511 check_smt_enabled();
Scott Wood28efc352013-10-11 19:22:38 -0500512 setup_tlb_core_data();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000513
Andy Fleminge16c8762011-12-08 01:20:27 -0600514 /*
515 * Freescale Book3e parts spin in a loop provided by firmware,
516 * so smp_release_cpus() does nothing for them
517 */
518#if defined(CONFIG_SMP) && !defined(CONFIG_PPC_FSL_BOOK3E)
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000519 /* Release secondary cpus out of their spinloops at 0x60 now that
520 * we can map physical -> logical CPU ids
521 */
522 smp_release_cpus();
Michael Ellermanf018b362006-02-16 14:13:50 +1100523#endif
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000524
Serge E. Hallyn96b644b2006-10-02 02:18:13 -0700525 printk("Starting Linux PPC64 %s\n", init_utsname()->version);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000526
527 printk("-----------------------------------------------------\n");
Ingo Molnarfe333322009-01-06 14:26:03 +0000528 printk("ppc64_pft_size = 0x%llx\n", ppc64_pft_size);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000529 printk("physicalMemorySize = 0x%llx\n", memblock_phys_mem_size());
Anton Blanchard9697add2007-10-15 05:33:17 +1000530 if (ppc64_caches.dline_size != 0x80)
531 printk("ppc64_caches.dcache_line_size = 0x%x\n",
532 ppc64_caches.dline_size);
533 if (ppc64_caches.iline_size != 0x80)
534 printk("ppc64_caches.icache_line_size = 0x%x\n",
535 ppc64_caches.iline_size);
Benjamin Herrenschmidt94491682009-06-02 21:17:45 +0000536#ifdef CONFIG_PPC_STD_MMU_64
Anton Blanchard9697add2007-10-15 05:33:17 +1000537 if (htab_address)
538 printk("htab_address = 0x%p\n", htab_address);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000539 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
Benjamin Herrenschmidt94491682009-06-02 21:17:45 +0000540#endif /* CONFIG_PPC_STD_MMU_64 */
Michael Neulingb1605442008-10-22 19:39:49 +0000541 if (PHYSICAL_START > 0)
Michael Ellermane4684552009-06-10 19:05:00 +0000542 printk("physical_start = 0x%llx\n",
543 (unsigned long long)PHYSICAL_START);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000544 printk("-----------------------------------------------------\n");
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000545
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000546 DBG(" <- setup_system()\n");
547}
548
Benjamin Herrenschmidt40bd5872011-05-03 14:07:01 +0000549/* This returns the limit below which memory accesses to the linear
550 * mapping are guarnateed not to cause a TLB or SLB miss. This is
551 * used to allocate interrupt or emergency stacks for which our
552 * exception entry path doesn't deal with being interrupted.
553 */
554static u64 safe_stack_limit(void)
Anton Blanchard095c7962010-05-10 18:59:18 +0000555{
Benjamin Herrenschmidt40bd5872011-05-03 14:07:01 +0000556#ifdef CONFIG_PPC_BOOK3E
557 /* Freescale BookE bolts the entire linear mapping */
558 if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
559 return linear_map_top;
560 /* Other BookE, we assume the first GB is bolted */
561 return 1ul << 30;
562#else
563 /* BookS, the first segment is bolted */
564 if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
Anton Blanchard095c7962010-05-10 18:59:18 +0000565 return 1UL << SID_SHIFT_1T;
Anton Blanchard095c7962010-05-10 18:59:18 +0000566 return 1UL << SID_SHIFT;
Benjamin Herrenschmidt40bd5872011-05-03 14:07:01 +0000567#endif
Anton Blanchard095c7962010-05-10 18:59:18 +0000568}
569
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000570static void __init irqstack_early_init(void)
571{
Benjamin Herrenschmidt40bd5872011-05-03 14:07:01 +0000572 u64 limit = safe_stack_limit();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000573 unsigned int i;
574
575 /*
Anton Blanchard8f4da262010-12-08 00:55:03 +0000576 * Interrupt stacks must be in the first segment since we
577 * cannot afford to take SLB misses on them.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000578 */
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -0800579 for_each_possible_cpu(i) {
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100580 softirq_ctx[i] = (struct thread_info *)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000581 __va(memblock_alloc_base(THREAD_SIZE,
Anton Blanchard095c7962010-05-10 18:59:18 +0000582 THREAD_SIZE, limit));
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100583 hardirq_ctx[i] = (struct thread_info *)
Yinghai Lu95f72d12010-07-12 14:36:09 +1000584 __va(memblock_alloc_base(THREAD_SIZE,
Anton Blanchard095c7962010-05-10 18:59:18 +0000585 THREAD_SIZE, limit));
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000586 }
587}
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000588
Benjamin Herrenschmidt2d27cfd2009-07-23 23:15:59 +0000589#ifdef CONFIG_PPC_BOOK3E
590static void __init exc_lvl_early_init(void)
591{
592 unsigned int i;
Tiejun Chen160c7322013-10-23 17:31:21 +0800593 unsigned long sp;
Benjamin Herrenschmidt2d27cfd2009-07-23 23:15:59 +0000594
595 for_each_possible_cpu(i) {
Tiejun Chen160c7322013-10-23 17:31:21 +0800596 sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
597 critirq_ctx[i] = (struct thread_info *)__va(sp);
598 paca[i].crit_kstack = __va(sp + THREAD_SIZE);
599
600 sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
601 dbgirq_ctx[i] = (struct thread_info *)__va(sp);
602 paca[i].dbg_kstack = __va(sp + THREAD_SIZE);
603
604 sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
605 mcheckirq_ctx[i] = (struct thread_info *)__va(sp);
606 paca[i].mc_kstack = __va(sp + THREAD_SIZE);
Benjamin Herrenschmidt2d27cfd2009-07-23 23:15:59 +0000607 }
Kumar Galad36b4c42011-04-06 00:18:48 -0500608
609 if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
Kevin Hao565c2f22013-05-12 07:26:23 +0800610 patch_exception(0x040, exc_debug_debug_book3e);
Benjamin Herrenschmidt2d27cfd2009-07-23 23:15:59 +0000611}
612#else
613#define exc_lvl_early_init()
614#endif
615
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000616/*
617 * Stack space used when we detect a bad kernel stack pointer, and
Mahesh Salgaonkar729b0f72013-10-30 20:04:00 +0530618 * early in SMP boots before relocation is enabled. Exclusive emergency
619 * stack for machine checks.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000620 */
621static void __init emergency_stack_init(void)
622{
Anton Blanchard095c7962010-05-10 18:59:18 +0000623 u64 limit;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000624 unsigned int i;
625
626 /*
627 * Emergency stacks must be under 256MB, we cannot afford to take
628 * SLB misses on them. The ABI also requires them to be 128-byte
629 * aligned.
630 *
631 * Since we use these as temporary stacks during secondary CPU
632 * bringup, we need to get at them in real mode. This means they
633 * must also be within the RMO region.
634 */
Benjamin Herrenschmidt40bd5872011-05-03 14:07:01 +0000635 limit = min(safe_stack_limit(), ppc64_rma_size);
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000636
Michael Ellerman3243d872008-04-30 13:21:45 +1000637 for_each_possible_cpu(i) {
638 unsigned long sp;
Yinghai Lu95f72d12010-07-12 14:36:09 +1000639 sp = memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
Michael Ellerman3243d872008-04-30 13:21:45 +1000640 sp += THREAD_SIZE;
641 paca[i].emergency_sp = __va(sp);
Mahesh Salgaonkar729b0f72013-10-30 20:04:00 +0530642
643#ifdef CONFIG_PPC_BOOK3S_64
644 /* emergency stack for machine check exception handling. */
645 sp = memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
646 sp += THREAD_SIZE;
647 paca[i].mc_emergency_sp = __va(sp);
648#endif
Michael Ellerman3243d872008-04-30 13:21:45 +1000649 }
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000650}
651
652/*
Alessio Igor Bogani0f6b77c2010-11-16 07:55:16 +0000653 * Called into from start_kernel this initializes bootmem, which is used
654 * to manage page allocation until mem_init is called.
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000655 */
656void __init setup_arch(char **cmdline_p)
657{
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000658 ppc64_boot_msg(0x12, "Setup Arch");
659
660 *cmdline_p = cmd_line;
661
662 /*
663 * Set cache line size based on type of cpu as a default.
664 * Systems with OF can look in the properties on the cpu node(s)
665 * for a possibly more accurate value.
666 */
667 dcache_bsize = ppc64_caches.dline_size;
668 icache_bsize = ppc64_caches.iline_size;
669
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000670 if (ppc_md.panic)
Kumar Gala7e990262006-05-05 00:02:08 -0500671 setup_panic();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000672
Kumar Gala4846c5d2008-04-16 05:52:26 +1000673 init_mm.start_code = (unsigned long)_stext;
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000674 init_mm.end_code = (unsigned long) _etext;
675 init_mm.end_data = (unsigned long) _edata;
676 init_mm.brk = klimit;
Aneesh Kumar K.V5c1f6ee2013-04-28 09:37:33 +0000677#ifdef CONFIG_PPC_64K_PAGES
678 init_mm.context.pte_frag = NULL;
679#endif
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000680 irqstack_early_init();
Benjamin Herrenschmidt2d27cfd2009-07-23 23:15:59 +0000681 exc_lvl_early_init();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000682 emergency_stack_init();
683
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000684 /* set up the bootmem stuff with available memory */
685 do_init_bootmem();
686 sparse_init();
687
Paul Mackerras04580602005-10-20 21:00:20 +1000688#ifdef CONFIG_DUMMY_CONSOLE
689 conswitchp = &dummy_con;
690#endif
691
Grant Likely38db7e72007-10-11 04:48:18 +1000692 if (ppc_md.setup_arch)
693 ppc_md.setup_arch();
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000694
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000695 paging_init();
Benjamin Herrenschmidt6f0ef0f2009-07-23 23:15:26 +0000696
697 /* Initialize the MMU context management stuff */
698 mmu_context_init();
699
Michael Neuling61e23902012-11-05 17:10:35 +1100700 /* Interrupt code needs to be 64K-aligned */
701 if ((unsigned long)_stext & 0xffff)
702 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
703 (unsigned long)_stext);
704
Paul Mackerras40ef8cb2005-10-10 22:50:37 +1000705 ppc64_boot_msg(0x15, "Setup Done");
706}
707
708
709/* ToDo: do something useful if ppc_md is not yet setup. */
710#define PPC64_LINUX_FUNCTION 0x0f000000
711#define PPC64_IPL_MESSAGE 0xc0000000
712#define PPC64_TERM_MESSAGE 0xb0000000
713
714static void ppc64_do_msg(unsigned int src, const char *msg)
715{
716 if (ppc_md.progress) {
717 char buf[128];
718
719 sprintf(buf, "%08X\n", src);
720 ppc_md.progress(buf, 0);
721 snprintf(buf, 128, "%s", msg);
722 ppc_md.progress(buf, 0);
723 }
724}
725
726/* Print a boot progress message. */
727void ppc64_boot_msg(unsigned int src, const char *msg)
728{
729 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
730 printk("[boot]%04x %s\n", src, msg);
731}
732
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100733#ifdef CONFIG_SMP
Tejun Heoc2a7e812009-08-14 15:00:53 +0900734#define PCPU_DYN_SIZE ()
735
736static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
737{
738 return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align,
739 __pa(MAX_DMA_ADDRESS));
740}
741
742static void __init pcpu_fc_free(void *ptr, size_t size)
743{
744 free_bootmem(__pa(ptr), size);
745}
746
747static int pcpu_cpu_distance(unsigned int from, unsigned int to)
748{
749 if (cpu_to_node(from) == cpu_to_node(to))
750 return LOCAL_DISTANCE;
751 else
752 return REMOTE_DISTANCE;
753}
754
Anton Blanchardae01f842010-05-31 18:45:11 +0000755unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
756EXPORT_SYMBOL(__per_cpu_offset);
757
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100758void __init setup_per_cpu_areas(void)
759{
Tejun Heoc2a7e812009-08-14 15:00:53 +0900760 const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
761 size_t atom_size;
762 unsigned long delta;
763 unsigned int cpu;
764 int rc;
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100765
Tejun Heoc2a7e812009-08-14 15:00:53 +0900766 /*
767 * Linear mapping is one of 4K, 1M and 16M. For 4K, no need
768 * to group units. For larger mappings, use 1M atom which
769 * should be large enough to contain a number of units.
770 */
771 if (mmu_linear_psize == MMU_PAGE_4K)
772 atom_size = PAGE_SIZE;
773 else
774 atom_size = 1 << 20;
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100775
Tejun Heoc2a7e812009-08-14 15:00:53 +0900776 rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
777 pcpu_fc_alloc, pcpu_fc_free);
778 if (rc < 0)
779 panic("cannot initialize percpu area (err=%d)", rc);
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100780
Tejun Heoc2a7e812009-08-14 15:00:53 +0900781 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
Anton Blanchardae01f842010-05-31 18:45:11 +0000782 for_each_possible_cpu(cpu) {
783 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
784 paca[cpu].data_offset = __per_cpu_offset[cpu];
785 }
Anton Blanchard7a0268f2006-01-11 13:16:44 +1100786}
787#endif
Benjamin Herrenschmidt4cb3cee2006-11-11 17:25:10 +1100788
Anton Blancharda5d86252014-06-04 17:50:47 +1000789#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
790unsigned long memory_block_size_bytes(void)
791{
792 if (ppc_md.memory_block_size)
793 return ppc_md.memory_block_size();
794
795 return MIN_MEMORY_BLOCK_SIZE;
796}
797#endif
Benjamin Herrenschmidt4cb3cee2006-11-11 17:25:10 +1100798
Benjamin Herrenschmidtecd73cc2013-07-15 13:03:08 +1000799#if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO)
Benjamin Herrenschmidt4cb3cee2006-11-11 17:25:10 +1100800struct ppc_pci_io ppc_pci_io;
801EXPORT_SYMBOL(ppc_pci_io);
Benjamin Herrenschmidtecd73cc2013-07-15 13:03:08 +1000802#endif