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9#include <linux/acpi.h>
10#include <linux/export.h>
11#include <linux/kernel.h>
12#include <linux/stddef.h>
13#include <linux/ioport.h>
14#include <linux/delay.h>
15#include <linux/initrd.h>
16#include <linux/console.h>
17#include <linux/cache.h>
18#include <linux/screen_info.h>
19#include <linux/init.h>
20#include <linux/kexec.h>
21#include <linux/root_dev.h>
22#include <linux/cpu.h>
23#include <linux/interrupt.h>
24#include <linux/smp.h>
25#include <linux/fs.h>
26#include <linux/proc_fs.h>
27#include <linux/memblock.h>
28#include <linux/of_fdt.h>
29#include <linux/efi.h>
30#include <linux/psci.h>
31#include <linux/sched/task.h>
32#include <linux/mm.h>
33
34#include <asm/acpi.h>
35#include <asm/fixmap.h>
36#include <asm/cpu.h>
37#include <asm/cputype.h>
38#include <asm/daifflags.h>
39#include <asm/elf.h>
40#include <asm/cpufeature.h>
41#include <asm/cpu_ops.h>
42#include <asm/kasan.h>
43#include <asm/numa.h>
44#include <asm/sections.h>
45#include <asm/setup.h>
46#include <asm/smp_plat.h>
47#include <asm/cacheflush.h>
48#include <asm/tlbflush.h>
49#include <asm/traps.h>
50#include <asm/efi.h>
51#include <asm/xen/hypervisor.h>
52#include <asm/mmu_context.h>
53
54static int num_standard_resources;
55static struct resource *standard_resources;
56
57phys_addr_t __fdt_pointer __initdata;
58
59
60
61
62static struct resource mem_res[] = {
63 {
64 .name = "Kernel code",
65 .start = 0,
66 .end = 0,
67 .flags = IORESOURCE_SYSTEM_RAM
68 },
69 {
70 .name = "Kernel data",
71 .start = 0,
72 .end = 0,
73 .flags = IORESOURCE_SYSTEM_RAM
74 }
75};
76
77#define kernel_code mem_res[0]
78#define kernel_data mem_res[1]
79
80
81
82
83u64 __cacheline_aligned boot_args[4];
84
85void __init smp_setup_processor_id(void)
86{
87 u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
88 set_cpu_logical_map(0, mpidr);
89
90
91
92
93
94
95 set_my_cpu_offset(0);
96 pr_info("Booting Linux on physical CPU 0x%010lx [0x%08x]\n",
97 (unsigned long)mpidr, read_cpuid_id());
98}
99
100bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
101{
102 return phys_id == cpu_logical_map(cpu);
103}
104
105struct mpidr_hash mpidr_hash;
106
107
108
109
110
111
112static void __init smp_build_mpidr_hash(void)
113{
114 u32 i, affinity, fs[4], bits[4], ls;
115 u64 mask = 0;
116
117
118
119
120 for_each_possible_cpu(i)
121 mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
122 pr_debug("mask of set bits %#llx\n", mask);
123
124
125
126
127 for (i = 0; i < 4; i++) {
128 affinity = MPIDR_AFFINITY_LEVEL(mask, i);
129
130
131
132
133
134 ls = fls(affinity);
135 fs[i] = affinity ? ffs(affinity) - 1 : 0;
136 bits[i] = ls - fs[i];
137 }
138
139
140
141
142
143
144
145
146
147
148 mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
149 mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
150 mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
151 (bits[1] + bits[0]);
152 mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
153 fs[3] - (bits[2] + bits[1] + bits[0]);
154 mpidr_hash.mask = mask;
155 mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
156 pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
157 mpidr_hash.shift_aff[0],
158 mpidr_hash.shift_aff[1],
159 mpidr_hash.shift_aff[2],
160 mpidr_hash.shift_aff[3],
161 mpidr_hash.mask,
162 mpidr_hash.bits);
163
164
165
166
167 if (mpidr_hash_size() > 4 * num_possible_cpus())
168 pr_warn("Large number of MPIDR hash buckets detected\n");
169}
170
171static void *early_fdt_ptr __initdata;
172
173void __init *get_early_fdt_ptr(void)
174{
175 return early_fdt_ptr;
176}
177
178asmlinkage void __init early_fdt_map(u64 dt_phys)
179{
180 int fdt_size;
181
182 early_fixmap_init();
183 early_fdt_ptr = fixmap_remap_fdt(dt_phys, &fdt_size, PAGE_KERNEL);
184}
185
186static void __init setup_machine_fdt(phys_addr_t dt_phys)
187{
188 int size;
189 void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
190 const char *name;
191
192 if (dt_virt)
193 memblock_reserve(dt_phys, size);
194
195 if (!dt_virt || !early_init_dt_scan(dt_virt)) {
196 pr_crit("\n"
197 "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
198 "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
199 "\nPlease check your bootloader.",
200 &dt_phys, dt_virt);
201
202 while (true)
203 cpu_relax();
204 }
205
206
207 fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
208
209 name = of_flat_dt_get_machine_name();
210 if (!name)
211 return;
212
213 pr_info("Machine model: %s\n", name);
214 dump_stack_set_arch_desc("%s (DT)", name);
215}
216
217static void __init request_standard_resources(void)
218{
219 struct memblock_region *region;
220 struct resource *res;
221 unsigned long i = 0;
222 size_t res_size;
223
224 kernel_code.start = __pa_symbol(_stext);
225 kernel_code.end = __pa_symbol(__init_begin - 1);
226 kernel_data.start = __pa_symbol(_sdata);
227 kernel_data.end = __pa_symbol(_end - 1);
228
229 num_standard_resources = memblock.memory.cnt;
230 res_size = num_standard_resources * sizeof(*standard_resources);
231 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
232 if (!standard_resources)
233 panic("%s: Failed to allocate %zu bytes\n", __func__, res_size);
234
235 for_each_mem_region(region) {
236 res = &standard_resources[i++];
237 if (memblock_is_nomap(region)) {
238 res->name = "reserved";
239 res->flags = IORESOURCE_MEM;
240 } else {
241 res->name = "System RAM";
242 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
243 }
244 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
245 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
246
247 request_resource(&iomem_resource, res);
248
249 if (kernel_code.start >= res->start &&
250 kernel_code.end <= res->end)
251 request_resource(res, &kernel_code);
252 if (kernel_data.start >= res->start &&
253 kernel_data.end <= res->end)
254 request_resource(res, &kernel_data);
255#ifdef CONFIG_KEXEC_CORE
256
257 if (crashk_res.end && crashk_res.start >= res->start &&
258 crashk_res.end <= res->end)
259 request_resource(res, &crashk_res);
260#endif
261 }
262}
263
264static int __init reserve_memblock_reserved_regions(void)
265{
266 u64 i, j;
267
268 for (i = 0; i < num_standard_resources; ++i) {
269 struct resource *mem = &standard_resources[i];
270 phys_addr_t r_start, r_end, mem_size = resource_size(mem);
271
272 if (!memblock_is_region_reserved(mem->start, mem_size))
273 continue;
274
275 for_each_reserved_mem_range(j, &r_start, &r_end) {
276 resource_size_t start, end;
277
278 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
279 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
280
281 if (start > mem->end || end < mem->start)
282 continue;
283
284 reserve_region_with_split(mem, start, end, "reserved");
285 }
286 }
287
288 return 0;
289}
290arch_initcall(reserve_memblock_reserved_regions);
291
292u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
293
294u64 cpu_logical_map(unsigned int cpu)
295{
296 return __cpu_logical_map[cpu];
297}
298
299void __init __no_sanitize_address setup_arch(char **cmdline_p)
300{
301 init_mm.start_code = (unsigned long) _stext;
302 init_mm.end_code = (unsigned long) _etext;
303 init_mm.end_data = (unsigned long) _edata;
304 init_mm.brk = (unsigned long) _end;
305
306 *cmdline_p = boot_command_line;
307
308
309
310
311
312
313 arm64_use_ng_mappings = kaslr_requires_kpti();
314
315 early_fixmap_init();
316 early_ioremap_init();
317
318 setup_machine_fdt(__fdt_pointer);
319
320
321
322
323
324 jump_label_init();
325 parse_early_param();
326
327
328
329
330
331
332 local_daif_restore(DAIF_PROCCTX_NOIRQ);
333
334
335
336
337
338 cpu_uninstall_idmap();
339
340 xen_early_init();
341 efi_init();
342
343 if (!efi_enabled(EFI_BOOT) && ((u64)_text % MIN_KIMG_ALIGN) != 0)
344 pr_warn(FW_BUG "Kernel image misaligned at boot, please fix your bootloader!");
345
346 arm64_memblock_init();
347
348 paging_init();
349
350 acpi_table_upgrade();
351
352
353 acpi_boot_table_init();
354
355 if (acpi_disabled)
356 unflatten_device_tree();
357
358 bootmem_init();
359
360 kasan_init();
361
362 request_standard_resources();
363
364 early_ioremap_reset();
365
366 if (acpi_disabled)
367 psci_dt_init();
368 else
369 psci_acpi_init();
370
371 init_bootcpu_ops();
372 smp_init_cpus();
373 smp_build_mpidr_hash();
374
375
376 kasan_init_sw_tags();
377
378#ifdef CONFIG_ARM64_SW_TTBR0_PAN
379
380
381
382
383
384 init_task.thread_info.ttbr0 = __pa_symbol(reserved_pg_dir);
385#endif
386
387 if (boot_args[1] || boot_args[2] || boot_args[3]) {
388 pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
389 "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
390 "This indicates a broken bootloader or old kernel\n",
391 boot_args[1], boot_args[2], boot_args[3]);
392 }
393}
394
395static inline bool cpu_can_disable(unsigned int cpu)
396{
397#ifdef CONFIG_HOTPLUG_CPU
398 const struct cpu_operations *ops = get_cpu_ops(cpu);
399
400 if (ops && ops->cpu_can_disable)
401 return ops->cpu_can_disable(cpu);
402#endif
403 return false;
404}
405
406static int __init topology_init(void)
407{
408 int i;
409
410 for_each_online_node(i)
411 register_one_node(i);
412
413 for_each_possible_cpu(i) {
414 struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
415 cpu->hotpluggable = cpu_can_disable(i);
416 register_cpu(cpu, i);
417 }
418
419 return 0;
420}
421subsys_initcall(topology_init);
422
423static void dump_kernel_offset(void)
424{
425 const unsigned long offset = kaslr_offset();
426
427 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
428 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
429 offset, KIMAGE_VADDR);
430 pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
431 } else {
432 pr_emerg("Kernel Offset: disabled\n");
433 }
434}
435
436static int arm64_panic_block_dump(struct notifier_block *self,
437 unsigned long v, void *p)
438{
439 dump_kernel_offset();
440 dump_cpu_features();
441 dump_mem_limit();
442 return 0;
443}
444
445static struct notifier_block arm64_panic_block = {
446 .notifier_call = arm64_panic_block_dump
447};
448
449static int __init register_arm64_panic_block(void)
450{
451 atomic_notifier_chain_register(&panic_notifier_list,
452 &arm64_panic_block);
453 return 0;
454}
455device_initcall(register_arm64_panic_block);
456