~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/arm64/kernel/setup.c

Version: ~ [ linux-5.16 ] ~ [ linux-5.15.13 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.90 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.170 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.224 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.261 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.296 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.298 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Based on arch/arm/kernel/setup.c
  3  *
  4  * Copyright (C) 1995-2001 Russell King
  5  * Copyright (C) 2012 ARM Ltd.
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 18  */
 19 
 20 #include <linux/acpi.h>
 21 #include <linux/export.h>
 22 #include <linux/kernel.h>
 23 #include <linux/stddef.h>
 24 #include <linux/ioport.h>
 25 #include <linux/delay.h>
 26 #include <linux/initrd.h>
 27 #include <linux/console.h>
 28 #include <linux/cache.h>
 29 #include <linux/screen_info.h>
 30 #include <linux/init.h>
 31 #include <linux/kexec.h>
 32 #include <linux/root_dev.h>
 33 #include <linux/cpu.h>
 34 #include <linux/interrupt.h>
 35 #include <linux/smp.h>
 36 #include <linux/fs.h>
 37 #include <linux/proc_fs.h>
 38 #include <linux/memblock.h>
 39 #include <linux/of_fdt.h>
 40 #include <linux/efi.h>
 41 #include <linux/psci.h>
 42 #include <linux/sched/task.h>
 43 #include <linux/mm.h>
 44 
 45 #include <asm/acpi.h>
 46 #include <asm/fixmap.h>
 47 #include <asm/cpu.h>
 48 #include <asm/cputype.h>
 49 #include <asm/daifflags.h>
 50 #include <asm/elf.h>
 51 #include <asm/cpufeature.h>
 52 #include <asm/cpu_ops.h>
 53 #include <asm/kasan.h>
 54 #include <asm/numa.h>
 55 #include <asm/sections.h>
 56 #include <asm/setup.h>
 57 #include <asm/smp_plat.h>
 58 #include <asm/cacheflush.h>
 59 #include <asm/tlbflush.h>
 60 #include <asm/traps.h>
 61 #include <asm/memblock.h>
 62 #include <asm/efi.h>
 63 #include <asm/xen/hypervisor.h>
 64 #include <asm/mmu_context.h>
 65 
 66 static int num_standard_resources;
 67 static struct resource *standard_resources;
 68 
 69 phys_addr_t __fdt_pointer __initdata;
 70 
 71 /*
 72  * Standard memory resources
 73  */
 74 static struct resource mem_res[] = {
 75         {
 76                 .name = "Kernel code",
 77                 .start = 0,
 78                 .end = 0,
 79                 .flags = IORESOURCE_SYSTEM_RAM
 80         },
 81         {
 82                 .name = "Kernel data",
 83                 .start = 0,
 84                 .end = 0,
 85                 .flags = IORESOURCE_SYSTEM_RAM
 86         }
 87 };
 88 
 89 #define kernel_code mem_res[0]
 90 #define kernel_data mem_res[1]
 91 
 92 /*
 93  * The recorded values of x0 .. x3 upon kernel entry.
 94  */
 95 u64 __cacheline_aligned boot_args[4];
 96 
 97 void __init smp_setup_processor_id(void)
 98 {
 99         u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
100         cpu_logical_map(0) = mpidr;
101 
102         /*
103          * clear __my_cpu_offset on boot CPU to avoid hang caused by
104          * using percpu variable early, for example, lockdep will
105          * access percpu variable inside lock_release
106          */
107         set_my_cpu_offset(0);
108         pr_info("Booting Linux on physical CPU 0x%010lx [0x%08x]\n",
109                 (unsigned long)mpidr, read_cpuid_id());
110 }
111 
112 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
113 {
114         return phys_id == cpu_logical_map(cpu);
115 }
116 
117 struct mpidr_hash mpidr_hash;
118 /**
119  * smp_build_mpidr_hash - Pre-compute shifts required at each affinity
120  *                        level in order to build a linear index from an
121  *                        MPIDR value. Resulting algorithm is a collision
122  *                        free hash carried out through shifting and ORing
123  */
124 static void __init smp_build_mpidr_hash(void)
125 {
126         u32 i, affinity, fs[4], bits[4], ls;
127         u64 mask = 0;
128         /*
129          * Pre-scan the list of MPIDRS and filter out bits that do
130          * not contribute to affinity levels, ie they never toggle.
131          */
132         for_each_possible_cpu(i)
133                 mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
134         pr_debug("mask of set bits %#llx\n", mask);
135         /*
136          * Find and stash the last and first bit set at all affinity levels to
137          * check how many bits are required to represent them.
138          */
139         for (i = 0; i < 4; i++) {
140                 affinity = MPIDR_AFFINITY_LEVEL(mask, i);
141                 /*
142                  * Find the MSB bit and LSB bits position
143                  * to determine how many bits are required
144                  * to express the affinity level.
145                  */
146                 ls = fls(affinity);
147                 fs[i] = affinity ? ffs(affinity) - 1 : 0;
148                 bits[i] = ls - fs[i];
149         }
150         /*
151          * An index can be created from the MPIDR_EL1 by isolating the
152          * significant bits at each affinity level and by shifting
153          * them in order to compress the 32 bits values space to a
154          * compressed set of values. This is equivalent to hashing
155          * the MPIDR_EL1 through shifting and ORing. It is a collision free
156          * hash though not minimal since some levels might contain a number
157          * of CPUs that is not an exact power of 2 and their bit
158          * representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}.
159          */
160         mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
161         mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
162         mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
163                                                 (bits[1] + bits[0]);
164         mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
165                                   fs[3] - (bits[2] + bits[1] + bits[0]);
166         mpidr_hash.mask = mask;
167         mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
168         pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
169                 mpidr_hash.shift_aff[0],
170                 mpidr_hash.shift_aff[1],
171                 mpidr_hash.shift_aff[2],
172                 mpidr_hash.shift_aff[3],
173                 mpidr_hash.mask,
174                 mpidr_hash.bits);
175         /*
176          * 4x is an arbitrary value used to warn on a hash table much bigger
177          * than expected on most systems.
178          */
179         if (mpidr_hash_size() > 4 * num_possible_cpus())
180                 pr_warn("Large number of MPIDR hash buckets detected\n");
181 }
182 
183 static void __init setup_machine_fdt(phys_addr_t dt_phys)
184 {
185         void *dt_virt = fixmap_remap_fdt(dt_phys);
186         const char *name;
187 
188         if (!dt_virt || !early_init_dt_scan(dt_virt)) {
189                 pr_crit("\n"
190                         "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
191                         "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
192                         "\nPlease check your bootloader.",
193                         &dt_phys, dt_virt);
194 
195                 while (true)
196                         cpu_relax();
197         }
198 
199         name = of_flat_dt_get_machine_name();
200         if (!name)
201                 return;
202 
203         pr_info("Machine model: %s\n", name);
204         dump_stack_set_arch_desc("%s (DT)", name);
205 }
206 
207 static void __init request_standard_resources(void)
208 {
209         struct memblock_region *region;
210         struct resource *res;
211         unsigned long i = 0;
212 
213         kernel_code.start   = __pa_symbol(_text);
214         kernel_code.end     = __pa_symbol(__init_begin - 1);
215         kernel_data.start   = __pa_symbol(_sdata);
216         kernel_data.end     = __pa_symbol(_end - 1);
217 
218         num_standard_resources = memblock.memory.cnt;
219         standard_resources = memblock_alloc_low(num_standard_resources *
220                                                 sizeof(*standard_resources),
221                                                 SMP_CACHE_BYTES);
222 
223         for_each_memblock(memory, region) {
224                 res = &standard_resources[i++];
225                 if (memblock_is_nomap(region)) {
226                         res->name  = "reserved";
227                         res->flags = IORESOURCE_MEM;
228                 } else {
229                         res->name  = "System RAM";
230                         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
231                 }
232                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
233                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
234 
235                 request_resource(&iomem_resource, res);
236 
237                 if (kernel_code.start >= res->start &&
238                     kernel_code.end <= res->end)
239                         request_resource(res, &kernel_code);
240                 if (kernel_data.start >= res->start &&
241                     kernel_data.end <= res->end)
242                         request_resource(res, &kernel_data);
243 #ifdef CONFIG_KEXEC_CORE
244                 /* Userspace will find "Crash kernel" region in /proc/iomem. */
245                 if (crashk_res.end && crashk_res.start >= res->start &&
246                     crashk_res.end <= res->end)
247                         request_resource(res, &crashk_res);
248 #endif
249         }
250 }
251 
252 static int __init reserve_memblock_reserved_regions(void)
253 {
254         u64 i, j;
255 
256         for (i = 0; i < num_standard_resources; ++i) {
257                 struct resource *mem = &standard_resources[i];
258                 phys_addr_t r_start, r_end, mem_size = resource_size(mem);
259 
260                 if (!memblock_is_region_reserved(mem->start, mem_size))
261                         continue;
262 
263                 for_each_reserved_mem_region(j, &r_start, &r_end) {
264                         resource_size_t start, end;
265 
266                         start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
267                         end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
268 
269                         if (start > mem->end || end < mem->start)
270                                 continue;
271 
272                         reserve_region_with_split(mem, start, end, "reserved");
273                 }
274         }
275 
276         return 0;
277 }
278 arch_initcall(reserve_memblock_reserved_regions);
279 
280 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
281 
282 void __init setup_arch(char **cmdline_p)
283 {
284         init_mm.start_code = (unsigned long) _text;
285         init_mm.end_code   = (unsigned long) _etext;
286         init_mm.end_data   = (unsigned long) _edata;
287         init_mm.brk        = (unsigned long) _end;
288 
289         *cmdline_p = boot_command_line;
290 
291         early_fixmap_init();
292         early_ioremap_init();
293 
294         setup_machine_fdt(__fdt_pointer);
295 
296         parse_early_param();
297 
298         /*
299          * Unmask asynchronous aborts and fiq after bringing up possible
300          * earlycon. (Report possible System Errors once we can report this
301          * occurred).
302          */
303         local_daif_restore(DAIF_PROCCTX_NOIRQ);
304 
305         /*
306          * TTBR0 is only used for the identity mapping at this stage. Make it
307          * point to zero page to avoid speculatively fetching new entries.
308          */
309         cpu_uninstall_idmap();
310 
311         xen_early_init();
312         efi_init();
313         arm64_memblock_init();
314 
315         paging_init();
316 
317         acpi_table_upgrade();
318 
319         /* Parse the ACPI tables for possible boot-time configuration */
320         acpi_boot_table_init();
321 
322         if (acpi_disabled)
323                 unflatten_device_tree();
324 
325         bootmem_init();
326 
327         kasan_init();
328 
329         request_standard_resources();
330 
331         early_ioremap_reset();
332 
333         if (acpi_disabled)
334                 psci_dt_init();
335         else
336                 psci_acpi_init();
337 
338         cpu_read_bootcpu_ops();
339         smp_init_cpus();
340         smp_build_mpidr_hash();
341 
342         /* Init percpu seeds for random tags after cpus are set up. */
343         kasan_init_tags();
344 
345 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
346         /*
347          * Make sure init_thread_info.ttbr0 always generates translation
348          * faults in case uaccess_enable() is inadvertently called by the init
349          * thread.
350          */
351         init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page);
352 #endif
353 
354 #ifdef CONFIG_VT
355         conswitchp = &dummy_con;
356 #endif
357         if (boot_args[1] || boot_args[2] || boot_args[3]) {
358                 pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
359                         "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
360                         "This indicates a broken bootloader or old kernel\n",
361                         boot_args[1], boot_args[2], boot_args[3]);
362         }
363 }
364 
365 static int __init topology_init(void)
366 {
367         int i;
368 
369         for_each_online_node(i)
370                 register_one_node(i);
371 
372         for_each_possible_cpu(i) {
373                 struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
374                 cpu->hotpluggable = 1;
375                 register_cpu(cpu, i);
376         }
377 
378         return 0;
379 }
380 subsys_initcall(topology_init);
381 
382 /*
383  * Dump out kernel offset information on panic.
384  */
385 static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
386                               void *p)
387 {
388         const unsigned long offset = kaslr_offset();
389 
390         if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
391                 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
392                          offset, KIMAGE_VADDR);
393                 pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
394         } else {
395                 pr_emerg("Kernel Offset: disabled\n");
396         }
397         return 0;
398 }
399 
400 static struct notifier_block kernel_offset_notifier = {
401         .notifier_call = dump_kernel_offset
402 };
403 
404 static int __init register_kernel_offset_dumper(void)
405 {
406         atomic_notifier_chain_register(&panic_notifier_list,
407                                        &kernel_offset_notifier);
408         return 0;
409 }
410 __initcall(register_kernel_offset_dumper);
411 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp