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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 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 __init setup_machine_fdt(phys_addr_t dt_phys)
172{
173 void *dt_virt = fixmap_remap_fdt(dt_phys);
174 const char *name;
175
176 if (!dt_virt || !early_init_dt_scan(dt_virt)) {
177 pr_crit("\n"
178 "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
179 "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
180 "\nPlease check your bootloader.",
181 &dt_phys, dt_virt);
182
183 while (true)
184 cpu_relax();
185 }
186
187 name = of_flat_dt_get_machine_name();
188 if (!name)
189 return;
190
191 pr_info("Machine model: %s\n", name);
192 dump_stack_set_arch_desc("%s (DT)", name);
193}
194
195static void __init request_standard_resources(void)
196{
197 struct memblock_region *region;
198 struct resource *res;
199 unsigned long i = 0;
200 size_t res_size;
201
202 kernel_code.start = __pa_symbol(_text);
203 kernel_code.end = __pa_symbol(__init_begin - 1);
204 kernel_data.start = __pa_symbol(_sdata);
205 kernel_data.end = __pa_symbol(_end - 1);
206
207 num_standard_resources = memblock.memory.cnt;
208 res_size = num_standard_resources * sizeof(*standard_resources);
209 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
210 if (!standard_resources)
211 panic("%s: Failed to allocate %zu bytes\n", __func__, res_size);
212
213 for_each_memblock(memory, region) {
214 res = &standard_resources[i++];
215 if (memblock_is_nomap(region)) {
216 res->name = "reserved";
217 res->flags = IORESOURCE_MEM;
218 } else {
219 res->name = "System RAM";
220 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
221 }
222 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
223 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
224
225 request_resource(&iomem_resource, res);
226
227 if (kernel_code.start >= res->start &&
228 kernel_code.end <= res->end)
229 request_resource(res, &kernel_code);
230 if (kernel_data.start >= res->start &&
231 kernel_data.end <= res->end)
232 request_resource(res, &kernel_data);
233#ifdef CONFIG_KEXEC_CORE
234
235 if (crashk_res.end && crashk_res.start >= res->start &&
236 crashk_res.end <= res->end)
237 request_resource(res, &crashk_res);
238#endif
239 }
240}
241
242static int __init reserve_memblock_reserved_regions(void)
243{
244 u64 i, j;
245
246 for (i = 0; i < num_standard_resources; ++i) {
247 struct resource *mem = &standard_resources[i];
248 phys_addr_t r_start, r_end, mem_size = resource_size(mem);
249
250 if (!memblock_is_region_reserved(mem->start, mem_size))
251 continue;
252
253 for_each_reserved_mem_region(j, &r_start, &r_end) {
254 resource_size_t start, end;
255
256 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
257 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
258
259 if (start > mem->end || end < mem->start)
260 continue;
261
262 reserve_region_with_split(mem, start, end, "reserved");
263 }
264 }
265
266 return 0;
267}
268arch_initcall(reserve_memblock_reserved_regions);
269
270u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
271
272void __init setup_arch(char **cmdline_p)
273{
274 init_mm.start_code = (unsigned long) _text;
275 init_mm.end_code = (unsigned long) _etext;
276 init_mm.end_data = (unsigned long) _edata;
277 init_mm.brk = (unsigned long) _end;
278
279 *cmdline_p = boot_command_line;
280
281 early_fixmap_init();
282 early_ioremap_init();
283
284 setup_machine_fdt(__fdt_pointer);
285
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288
289
290 jump_label_init();
291 parse_early_param();
292
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296
297
298 local_daif_restore(DAIF_PROCCTX_NOIRQ);
299
300
301
302
303
304 cpu_uninstall_idmap();
305
306 xen_early_init();
307 efi_init();
308 arm64_memblock_init();
309
310 paging_init();
311
312 acpi_table_upgrade();
313
314
315 acpi_boot_table_init();
316
317 if (acpi_disabled)
318 unflatten_device_tree();
319
320 bootmem_init();
321
322 kasan_init();
323
324 request_standard_resources();
325
326 early_ioremap_reset();
327
328 if (acpi_disabled)
329 psci_dt_init();
330 else
331 psci_acpi_init();
332
333 cpu_read_bootcpu_ops();
334 smp_init_cpus();
335 smp_build_mpidr_hash();
336
337
338 kasan_init_tags();
339
340#ifdef CONFIG_ARM64_SW_TTBR0_PAN
341
342
343
344
345
346 init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page);
347#endif
348
349#ifdef CONFIG_VT
350 conswitchp = &dummy_con;
351#endif
352 if (boot_args[1] || boot_args[2] || boot_args[3]) {
353 pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
354 "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
355 "This indicates a broken bootloader or old kernel\n",
356 boot_args[1], boot_args[2], boot_args[3]);
357 }
358}
359
360static int __init topology_init(void)
361{
362 int i;
363
364 for_each_online_node(i)
365 register_one_node(i);
366
367 for_each_possible_cpu(i) {
368 struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
369 cpu->hotpluggable = 1;
370 register_cpu(cpu, i);
371 }
372
373 return 0;
374}
375subsys_initcall(topology_init);
376
377
378
379
380static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
381 void *p)
382{
383 const unsigned long offset = kaslr_offset();
384
385 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
386 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
387 offset, KIMAGE_VADDR);
388 pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
389 } else {
390 pr_emerg("Kernel Offset: disabled\n");
391 }
392 return 0;
393}
394
395static struct notifier_block kernel_offset_notifier = {
396 .notifier_call = dump_kernel_offset
397};
398
399static int __init register_kernel_offset_dumper(void)
400{
401 atomic_notifier_chain_register(&panic_notifier_list,
402 &kernel_offset_notifier);
403 return 0;
404}
405__initcall(register_kernel_offset_dumper);
406