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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/bootmem.h>
30#include <linux/screen_info.h>
31#include <linux/init.h>
32#include <linux/kexec.h>
33#include <linux/root_dev.h>
34#include <linux/cpu.h>
35#include <linux/interrupt.h>
36#include <linux/smp.h>
37#include <linux/fs.h>
38#include <linux/proc_fs.h>
39#include <linux/memblock.h>
40#include <linux/of_fdt.h>
41#include <linux/efi.h>
42#include <linux/psci.h>
43#include <linux/sched/task.h>
44#include <linux/mm.h>
45
46#include <asm/acpi.h>
47#include <asm/fixmap.h>
48#include <asm/cpu.h>
49#include <asm/cputype.h>
50#include <asm/daifflags.h>
51#include <asm/elf.h>
52#include <asm/cpufeature.h>
53#include <asm/cpu_ops.h>
54#include <asm/kasan.h>
55#include <asm/numa.h>
56#include <asm/sections.h>
57#include <asm/setup.h>
58#include <asm/smp_plat.h>
59#include <asm/cacheflush.h>
60#include <asm/tlbflush.h>
61#include <asm/traps.h>
62#include <asm/memblock.h>
63#include <asm/efi.h>
64#include <asm/xen/hypervisor.h>
65#include <asm/mmu_context.h>
66
67phys_addr_t __fdt_pointer __initdata;
68
69
70
71
72static struct resource mem_res[] = {
73 {
74 .name = "Kernel code",
75 .start = 0,
76 .end = 0,
77 .flags = IORESOURCE_SYSTEM_RAM
78 },
79 {
80 .name = "Kernel data",
81 .start = 0,
82 .end = 0,
83 .flags = IORESOURCE_SYSTEM_RAM
84 }
85};
86
87#define kernel_code mem_res[0]
88#define kernel_data mem_res[1]
89
90
91
92
93u64 __cacheline_aligned boot_args[4];
94
95void __init smp_setup_processor_id(void)
96{
97 u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
98 cpu_logical_map(0) = mpidr;
99
100
101
102
103
104
105 set_my_cpu_offset(0);
106 pr_info("Booting Linux on physical CPU 0x%010lx [0x%08x]\n",
107 (unsigned long)mpidr, read_cpuid_id());
108}
109
110bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
111{
112 return phys_id == cpu_logical_map(cpu);
113}
114
115struct mpidr_hash mpidr_hash;
116
117
118
119
120
121
122static void __init smp_build_mpidr_hash(void)
123{
124 u32 i, affinity, fs[4], bits[4], ls;
125 u64 mask = 0;
126
127
128
129
130 for_each_possible_cpu(i)
131 mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
132 pr_debug("mask of set bits %#llx\n", mask);
133
134
135
136
137 for (i = 0; i < 4; i++) {
138 affinity = MPIDR_AFFINITY_LEVEL(mask, i);
139
140
141
142
143
144 ls = fls(affinity);
145 fs[i] = affinity ? ffs(affinity) - 1 : 0;
146 bits[i] = ls - fs[i];
147 }
148
149
150
151
152
153
154
155
156
157
158 mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
159 mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
160 mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
161 (bits[1] + bits[0]);
162 mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
163 fs[3] - (bits[2] + bits[1] + bits[0]);
164 mpidr_hash.mask = mask;
165 mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
166 pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
167 mpidr_hash.shift_aff[0],
168 mpidr_hash.shift_aff[1],
169 mpidr_hash.shift_aff[2],
170 mpidr_hash.shift_aff[3],
171 mpidr_hash.mask,
172 mpidr_hash.bits);
173
174
175
176
177 if (mpidr_hash_size() > 4 * num_possible_cpus())
178 pr_warn("Large number of MPIDR hash buckets detected\n");
179}
180
181static void __init setup_machine_fdt(phys_addr_t dt_phys)
182{
183 void *dt_virt = fixmap_remap_fdt(dt_phys);
184 const char *name;
185
186 if (!dt_virt || !early_init_dt_scan(dt_virt)) {
187 pr_crit("\n"
188 "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
189 "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
190 "\nPlease check your bootloader.",
191 &dt_phys, dt_virt);
192
193 while (true)
194 cpu_relax();
195 }
196
197 name = of_flat_dt_get_machine_name();
198 if (!name)
199 return;
200
201 pr_info("Machine model: %s\n", name);
202 dump_stack_set_arch_desc("%s (DT)", name);
203}
204
205static void __init request_standard_resources(void)
206{
207 struct memblock_region *region;
208 struct resource *res;
209
210 kernel_code.start = __pa_symbol(_text);
211 kernel_code.end = __pa_symbol(__init_begin - 1);
212 kernel_data.start = __pa_symbol(_sdata);
213 kernel_data.end = __pa_symbol(_end - 1);
214
215 for_each_memblock(memory, region) {
216 res = alloc_bootmem_low(sizeof(*res));
217 if (memblock_is_nomap(region)) {
218 res->name = "reserved";
219 res->flags = IORESOURCE_MEM;
220 } else {
221 res->name = "System RAM";
222 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
223 }
224 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
225 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
226
227 request_resource(&iomem_resource, res);
228
229 if (kernel_code.start >= res->start &&
230 kernel_code.end <= res->end)
231 request_resource(res, &kernel_code);
232 if (kernel_data.start >= res->start &&
233 kernel_data.end <= res->end)
234 request_resource(res, &kernel_data);
235#ifdef CONFIG_KEXEC_CORE
236
237 if (crashk_res.end && crashk_res.start >= res->start &&
238 crashk_res.end <= res->end)
239 request_resource(res, &crashk_res);
240#endif
241 }
242}
243
244u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
245
246void __init setup_arch(char **cmdline_p)
247{
248 init_mm.start_code = (unsigned long) _text;
249 init_mm.end_code = (unsigned long) _etext;
250 init_mm.end_data = (unsigned long) _edata;
251 init_mm.brk = (unsigned long) _end;
252
253 *cmdline_p = boot_command_line;
254
255 early_fixmap_init();
256 early_ioremap_init();
257
258 setup_machine_fdt(__fdt_pointer);
259
260 parse_early_param();
261
262
263
264
265
266
267 local_daif_restore(DAIF_PROCCTX_NOIRQ);
268
269
270
271
272
273 cpu_uninstall_idmap();
274
275 xen_early_init();
276 efi_init();
277 arm64_memblock_init();
278
279 paging_init();
280
281 acpi_table_upgrade();
282
283
284 acpi_boot_table_init();
285
286 if (acpi_disabled)
287 unflatten_device_tree();
288
289 bootmem_init();
290
291 kasan_init();
292
293 request_standard_resources();
294
295 early_ioremap_reset();
296
297 if (acpi_disabled)
298 psci_dt_init();
299 else
300 psci_acpi_init();
301
302 cpu_read_bootcpu_ops();
303 smp_init_cpus();
304 smp_build_mpidr_hash();
305
306#ifdef CONFIG_ARM64_SW_TTBR0_PAN
307
308
309
310
311
312 init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page);
313#endif
314
315#ifdef CONFIG_VT
316#if defined(CONFIG_VGA_CONSOLE)
317 conswitchp = &vga_con;
318#elif defined(CONFIG_DUMMY_CONSOLE)
319 conswitchp = &dummy_con;
320#endif
321#endif
322 if (boot_args[1] || boot_args[2] || boot_args[3]) {
323 pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
324 "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
325 "This indicates a broken bootloader or old kernel\n",
326 boot_args[1], boot_args[2], boot_args[3]);
327 }
328}
329
330static int __init topology_init(void)
331{
332 int i;
333
334 for_each_online_node(i)
335 register_one_node(i);
336
337 for_each_possible_cpu(i) {
338 struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
339 cpu->hotpluggable = 1;
340 register_cpu(cpu, i);
341 }
342
343 return 0;
344}
345subsys_initcall(topology_init);
346
347
348
349
350static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
351 void *p)
352{
353 const unsigned long offset = kaslr_offset();
354
355 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
356 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
357 offset, KIMAGE_VADDR);
358 } else {
359 pr_emerg("Kernel Offset: disabled\n");
360 }
361 return 0;
362}
363
364static struct notifier_block kernel_offset_notifier = {
365 .notifier_call = dump_kernel_offset
366};
367
368static int __init register_kernel_offset_dumper(void)
369{
370 atomic_notifier_chain_register(&panic_notifier_list,
371 &kernel_offset_notifier);
372 return 0;
373}
374__initcall(register_kernel_offset_dumper);
375