3 * Common boot and setup code.
5 * Copyright (C) 2001 PPC64 Team, IBM Corp
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.
15 #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>
23 #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>
34 #include <linux/bootmem.h>
35 #include <linux/pci.h>
36 #include <linux/lockdep.h>
37 #include <linux/lmb.h>
39 #include <asm/kdump.h>
41 #include <asm/processor.h>
42 #include <asm/pgtable.h>
45 #include <asm/machdep.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>
55 #include <asm/iommu.h>
56 #include <asm/serial.h>
57 #include <asm/cache.h>
60 #include <asm/mmu-hash64.h>
61 #include <asm/firmware.h>
64 #include <asm/kexec.h>
65 #include <asm/swiotlb.h>
66 #include <asm/mmu_context.h>
71 #define DBG(fmt...) udbg_printf(fmt)
79 /* Pick defaults since we might want to patch instructions
80 * before we've read this from the device tree.
82 struct ppc64_caches ppc64_caches = {
88 EXPORT_SYMBOL_GPL(ppc64_caches);
91 * These are used in binfmt_elf.c to put aux entries on the stack
92 * for each elf executable being started.
100 static int smt_enabled_cmdline;
102 /* Look for ibm,smt-enabled OF option */
103 static void check_smt_enabled(void)
105 struct device_node *dn;
106 const char *smt_option;
108 /* Allow the command line to overrule the OF option */
109 if (smt_enabled_cmdline)
112 dn = of_find_node_by_path("/options");
115 smt_option = of_get_property(dn, "ibm,smt-enabled", NULL);
118 if (!strcmp(smt_option, "on"))
119 smt_enabled_at_boot = 1;
120 else if (!strcmp(smt_option, "off"))
121 smt_enabled_at_boot = 0;
126 /* Look for smt-enabled= cmdline option */
127 static int __init early_smt_enabled(char *p)
129 smt_enabled_cmdline = 1;
134 if (!strcmp(p, "on") || !strcmp(p, "1"))
135 smt_enabled_at_boot = 1;
136 else if (!strcmp(p, "off") || !strcmp(p, "0"))
137 smt_enabled_at_boot = 0;
141 early_param("smt-enabled", early_smt_enabled);
144 #define check_smt_enabled()
145 #endif /* CONFIG_SMP */
147 /* Put the paca pointer into r13 and SPRG_PACA */
148 void __init setup_paca(int cpu)
150 local_paca = &paca[cpu];
151 mtspr(SPRN_SPRG_PACA, local_paca);
152 #ifdef CONFIG_PPC_BOOK3E
153 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
158 * Early initialization entry point. This is called by head.S
159 * with MMU translation disabled. We rely on the "feature" of
160 * the CPU that ignores the top 2 bits of the address in real
161 * mode so we can access kernel globals normally provided we
162 * only toy with things in the RMO region. From here, we do
163 * some early parsing of the device-tree to setup out LMB
164 * data structures, and allocate & initialize the hash table
165 * and segment tables so we can start running with translation
168 * It is this function which will call the probe() callback of
169 * the various platform types and copy the matching one to the
170 * global ppc_md structure. Your platform can eventually do
171 * some very early initializations from the probe() routine, but
172 * this is not recommended, be very careful as, for example, the
173 * device-tree is not accessible via normal means at this point.
176 void __init early_setup(unsigned long dt_ptr)
178 /* -------- printk is _NOT_ safe to use here ! ------- */
180 /* Fill in any unititialised pacas */
183 /* Identify CPU type */
184 identify_cpu(0, mfspr(SPRN_PVR));
186 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
189 /* Initialize lockdep early or else spinlocks will blow */
192 /* -------- printk is now safe to use ------- */
194 /* Enable early debugging if any specified (see udbg.h) */
197 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
200 * Do early initialization using the flattened device
201 * tree, such as retrieving the physical memory map or
202 * calculating/retrieving the hash table size.
204 early_init_devtree(__va(dt_ptr));
206 /* Now we know the logical id of our boot cpu, setup the paca. */
207 setup_paca(boot_cpuid);
209 /* Fix up paca fields required for the boot cpu */
210 get_paca()->cpu_start = 1;
212 /* Probe the machine type */
215 setup_kdump_trampoline();
217 DBG("Found, Initializing memory management...\n");
219 /* Initialize the hash table or TLB handling */
222 DBG(" <- early_setup()\n");
226 void early_setup_secondary(void)
228 /* Mark interrupts enabled in PACA */
229 get_paca()->soft_enabled = 0;
231 /* Initialize the hash table or TLB handling */
232 early_init_mmu_secondary();
235 #endif /* CONFIG_SMP */
237 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
238 void smp_release_cpus(void)
242 DBG(" -> smp_release_cpus()\n");
244 /* All secondary cpus are spinning on a common spinloop, release them
245 * all now so they can start to spin on their individual paca
246 * spinloops. For non SMP kernels, the secondary cpus never get out
247 * of the common spinloop.
250 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
252 *ptr = __pa(generic_secondary_smp_init);
255 DBG(" <- smp_release_cpus()\n");
257 #endif /* CONFIG_SMP || CONFIG_KEXEC */
260 * Initialize some remaining members of the ppc64_caches and systemcfg
262 * (at least until we get rid of them completely). This is mostly some
263 * cache informations about the CPU that will be used by cache flush
264 * routines and/or provided to userland
266 static void __init initialize_cache_info(void)
268 struct device_node *np;
269 unsigned long num_cpus = 0;
271 DBG(" -> initialize_cache_info()\n");
273 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
276 /* We're assuming *all* of the CPUs have the same
277 * d-cache and i-cache sizes... -Peter
280 if ( num_cpus == 1 ) {
281 const u32 *sizep, *lsizep;
285 lsize = cur_cpu_spec->dcache_bsize;
286 sizep = of_get_property(np, "d-cache-size", NULL);
289 lsizep = of_get_property(np, "d-cache-block-size", NULL);
290 /* fallback if block size missing */
292 lsizep = of_get_property(np, "d-cache-line-size", NULL);
295 if (sizep == 0 || lsizep == 0)
296 DBG("Argh, can't find dcache properties ! "
297 "sizep: %p, lsizep: %p\n", sizep, lsizep);
299 ppc64_caches.dsize = size;
300 ppc64_caches.dline_size = lsize;
301 ppc64_caches.log_dline_size = __ilog2(lsize);
302 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
305 lsize = cur_cpu_spec->icache_bsize;
306 sizep = of_get_property(np, "i-cache-size", NULL);
309 lsizep = of_get_property(np, "i-cache-block-size", NULL);
311 lsizep = of_get_property(np, "i-cache-line-size", NULL);
314 if (sizep == 0 || lsizep == 0)
315 DBG("Argh, can't find icache properties ! "
316 "sizep: %p, lsizep: %p\n", sizep, lsizep);
318 ppc64_caches.isize = size;
319 ppc64_caches.iline_size = lsize;
320 ppc64_caches.log_iline_size = __ilog2(lsize);
321 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
325 DBG(" <- initialize_cache_info()\n");
330 * Do some initial setup of the system. The parameters are those which
331 * were passed in from the bootloader.
333 void __init setup_system(void)
335 DBG(" -> setup_system()\n");
337 /* Apply the CPUs-specific and firmware specific fixups to kernel
338 * text (nop out sections not relevant to this CPU or this firmware)
340 do_feature_fixups(cur_cpu_spec->cpu_features,
341 &__start___ftr_fixup, &__stop___ftr_fixup);
342 do_feature_fixups(cur_cpu_spec->mmu_features,
343 &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup);
344 do_feature_fixups(powerpc_firmware_features,
345 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
346 do_lwsync_fixups(cur_cpu_spec->cpu_features,
347 &__start___lwsync_fixup, &__stop___lwsync_fixup);
350 * Unflatten the device-tree passed by prom_init or kexec
352 unflatten_device_tree();
355 * Fill the ppc64_caches & systemcfg structures with informations
356 * retrieved from the device-tree.
358 initialize_cache_info();
361 * Initialize irq remapping subsystem
365 #ifdef CONFIG_PPC_RTAS
367 * Initialize RTAS if available
370 #endif /* CONFIG_PPC_RTAS */
373 * Check if we have an initrd provided via the device-tree
378 * Do some platform specific early initializations, that includes
379 * setting up the hash table pointers. It also sets up some interrupt-mapping
380 * related options that will be used by finish_device_tree()
382 if (ppc_md.init_early)
386 * We can discover serial ports now since the above did setup the
387 * hash table management for us, thus ioremap works. We do that early
388 * so that further code can be debugged
390 find_legacy_serial_ports();
393 * Register early console
395 register_early_udbg_console();
403 smp_setup_cpu_maps();
406 /* Release secondary cpus out of their spinloops at 0x60 now that
407 * we can map physical -> logical CPU ids
412 printk("Starting Linux PPC64 %s\n", init_utsname()->version);
414 printk("-----------------------------------------------------\n");
415 printk("ppc64_pft_size = 0x%llx\n", ppc64_pft_size);
416 printk("physicalMemorySize = 0x%llx\n", lmb_phys_mem_size());
417 if (ppc64_caches.dline_size != 0x80)
418 printk("ppc64_caches.dcache_line_size = 0x%x\n",
419 ppc64_caches.dline_size);
420 if (ppc64_caches.iline_size != 0x80)
421 printk("ppc64_caches.icache_line_size = 0x%x\n",
422 ppc64_caches.iline_size);
423 #ifdef CONFIG_PPC_STD_MMU_64
425 printk("htab_address = 0x%p\n", htab_address);
426 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
427 #endif /* CONFIG_PPC_STD_MMU_64 */
428 if (PHYSICAL_START > 0)
429 printk("physical_start = 0x%llx\n",
430 (unsigned long long)PHYSICAL_START);
431 printk("-----------------------------------------------------\n");
433 DBG(" <- setup_system()\n");
436 #ifdef CONFIG_IRQSTACKS
437 static void __init irqstack_early_init(void)
442 * interrupt stacks must be under 256MB, we cannot afford to take
443 * SLB misses on them.
445 for_each_possible_cpu(i) {
446 softirq_ctx[i] = (struct thread_info *)
447 __va(lmb_alloc_base(THREAD_SIZE,
448 THREAD_SIZE, 0x10000000));
449 hardirq_ctx[i] = (struct thread_info *)
450 __va(lmb_alloc_base(THREAD_SIZE,
451 THREAD_SIZE, 0x10000000));
455 #define irqstack_early_init()
458 #ifdef CONFIG_PPC_BOOK3E
459 static void __init exc_lvl_early_init(void)
463 for_each_possible_cpu(i) {
464 critirq_ctx[i] = (struct thread_info *)
465 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
466 dbgirq_ctx[i] = (struct thread_info *)
467 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
468 mcheckirq_ctx[i] = (struct thread_info *)
469 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
473 #define exc_lvl_early_init()
477 * Stack space used when we detect a bad kernel stack pointer, and
478 * early in SMP boots before relocation is enabled.
480 static void __init emergency_stack_init(void)
486 * Emergency stacks must be under 256MB, we cannot afford to take
487 * SLB misses on them. The ABI also requires them to be 128-byte
490 * Since we use these as temporary stacks during secondary CPU
491 * bringup, we need to get at them in real mode. This means they
492 * must also be within the RMO region.
494 limit = min(0x10000000ULL, lmb.rmo_size);
496 for_each_possible_cpu(i) {
498 sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
500 paca[i].emergency_sp = __va(sp);
505 * Called into from start_kernel, after lock_kernel has been called.
506 * Initializes bootmem, which is unsed to manage page allocation until
507 * mem_init is called.
509 void __init setup_arch(char **cmdline_p)
511 ppc64_boot_msg(0x12, "Setup Arch");
513 *cmdline_p = cmd_line;
516 * Set cache line size based on type of cpu as a default.
517 * Systems with OF can look in the properties on the cpu node(s)
518 * for a possibly more accurate value.
520 dcache_bsize = ppc64_caches.dline_size;
521 icache_bsize = ppc64_caches.iline_size;
523 /* reboot on panic */
529 init_mm.start_code = (unsigned long)_stext;
530 init_mm.end_code = (unsigned long) _etext;
531 init_mm.end_data = (unsigned long) _edata;
532 init_mm.brk = klimit;
534 irqstack_early_init();
535 exc_lvl_early_init();
536 emergency_stack_init();
538 #ifdef CONFIG_PPC_STD_MMU_64
541 /* set up the bootmem stuff with available memory */
545 #ifdef CONFIG_DUMMY_CONSOLE
546 conswitchp = &dummy_con;
549 if (ppc_md.setup_arch)
552 #ifdef CONFIG_SWIOTLB
553 if (ppc_swiotlb_enable)
559 /* Initialize the MMU context management stuff */
562 ppc64_boot_msg(0x15, "Setup Done");
566 /* ToDo: do something useful if ppc_md is not yet setup. */
567 #define PPC64_LINUX_FUNCTION 0x0f000000
568 #define PPC64_IPL_MESSAGE 0xc0000000
569 #define PPC64_TERM_MESSAGE 0xb0000000
571 static void ppc64_do_msg(unsigned int src, const char *msg)
573 if (ppc_md.progress) {
576 sprintf(buf, "%08X\n", src);
577 ppc_md.progress(buf, 0);
578 snprintf(buf, 128, "%s", msg);
579 ppc_md.progress(buf, 0);
583 /* Print a boot progress message. */
584 void ppc64_boot_msg(unsigned int src, const char *msg)
586 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
587 printk("[boot]%04x %s\n", src, msg);
597 #define PCPU_DYN_SIZE ()
599 static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
601 return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align,
602 __pa(MAX_DMA_ADDRESS));
605 static void __init pcpu_fc_free(void *ptr, size_t size)
607 free_bootmem(__pa(ptr), size);
610 static int pcpu_cpu_distance(unsigned int from, unsigned int to)
612 if (cpu_to_node(from) == cpu_to_node(to))
613 return LOCAL_DISTANCE;
615 return REMOTE_DISTANCE;
618 void __init setup_per_cpu_areas(void)
620 const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
627 * Linear mapping is one of 4K, 1M and 16M. For 4K, no need
628 * to group units. For larger mappings, use 1M atom which
629 * should be large enough to contain a number of units.
631 if (mmu_linear_psize == MMU_PAGE_4K)
632 atom_size = PAGE_SIZE;
636 rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
637 pcpu_fc_alloc, pcpu_fc_free);
639 panic("cannot initialize percpu area (err=%d)", rc);
641 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
642 for_each_possible_cpu(cpu)
643 paca[cpu].data_offset = delta + pcpu_unit_offsets[cpu];
648 #ifdef CONFIG_PPC_INDIRECT_IO
649 struct ppc_pci_io ppc_pci_io;
650 EXPORT_SYMBOL(ppc_pci_io);
651 #endif /* CONFIG_PPC_INDIRECT_IO */