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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/utsname.h>
27#include <linux/initrd.h>
28#include <linux/console.h>
29#include <linux/cache.h>
30#include <linux/bootmem.h>
31#include <linux/screen_info.h>
32#include <linux/init.h>
33#include <linux/kexec.h>
34#include <linux/crash_dump.h>
35#include <linux/root_dev.h>
36#include <linux/cpu.h>
37#include <linux/interrupt.h>
38#include <linux/smp.h>
39#include <linux/fs.h>
40#include <linux/proc_fs.h>
41#include <linux/memblock.h>
42#include <linux/of_fdt.h>
43#include <linux/efi.h>
44#include <linux/psci.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/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
66phys_addr_t __fdt_pointer __initdata;
67
68
69
70
71static struct resource mem_res[] = {
72 {
73 .name = "Kernel code",
74 .start = 0,
75 .end = 0,
76 .flags = IORESOURCE_SYSTEM_RAM
77 },
78 {
79 .name = "Kernel data",
80 .start = 0,
81 .end = 0,
82 .flags = IORESOURCE_SYSTEM_RAM
83 }
84};
85
86#define kernel_code mem_res[0]
87#define kernel_data mem_res[1]
88
89
90
91
92u64 __cacheline_aligned boot_args[4];
93
94void __init smp_setup_processor_id(void)
95{
96 u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
97 cpu_logical_map(0) = mpidr;
98
99
100
101
102
103
104 set_my_cpu_offset(0);
105 pr_info("Booting Linux on physical CPU 0x%lx\n", (unsigned long)mpidr);
106}
107
108bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
109{
110 return phys_id == cpu_logical_map(cpu);
111}
112
113struct mpidr_hash mpidr_hash;
114
115
116
117
118
119
120static void __init smp_build_mpidr_hash(void)
121{
122 u32 i, affinity, fs[4], bits[4], ls;
123 u64 mask = 0;
124
125
126
127
128 for_each_possible_cpu(i)
129 mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
130 pr_debug("mask of set bits %#llx\n", mask);
131
132
133
134
135 for (i = 0; i < 4; i++) {
136 affinity = MPIDR_AFFINITY_LEVEL(mask, i);
137
138
139
140
141
142 ls = fls(affinity);
143 fs[i] = affinity ? ffs(affinity) - 1 : 0;
144 bits[i] = ls - fs[i];
145 }
146
147
148
149
150
151
152
153
154
155
156 mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
157 mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
158 mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
159 (bits[1] + bits[0]);
160 mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
161 fs[3] - (bits[2] + bits[1] + bits[0]);
162 mpidr_hash.mask = mask;
163 mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
164 pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
165 mpidr_hash.shift_aff[0],
166 mpidr_hash.shift_aff[1],
167 mpidr_hash.shift_aff[2],
168 mpidr_hash.shift_aff[3],
169 mpidr_hash.mask,
170 mpidr_hash.bits);
171
172
173
174
175 if (mpidr_hash_size() > 4 * num_possible_cpus())
176 pr_warn("Large number of MPIDR hash buckets detected\n");
177}
178
179static void __init setup_machine_fdt(phys_addr_t dt_phys)
180{
181 void *dt_virt = fixmap_remap_fdt(dt_phys);
182
183 if (!dt_virt || !early_init_dt_scan(dt_virt)) {
184 pr_crit("\n"
185 "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
186 "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
187 "\nPlease check your bootloader.",
188 &dt_phys, dt_virt);
189
190 while (true)
191 cpu_relax();
192 }
193
194 dump_stack_set_arch_desc("%s (DT)", of_flat_dt_get_machine_name());
195}
196
197static void __init request_standard_resources(void)
198{
199 struct memblock_region *region;
200 struct resource *res;
201
202 kernel_code.start = virt_to_phys(_text);
203 kernel_code.end = virt_to_phys(__init_begin - 1);
204 kernel_data.start = virt_to_phys(_sdata);
205 kernel_data.end = virt_to_phys(_end - 1);
206
207 for_each_memblock(memory, region) {
208 res = alloc_bootmem_low(sizeof(*res));
209 if (memblock_is_nomap(region)) {
210 res->name = "reserved";
211 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
212 } else {
213 res->name = "System RAM";
214 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
215 }
216 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
217 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
218
219 request_resource(&iomem_resource, res);
220
221 if (kernel_code.start >= res->start &&
222 kernel_code.end <= res->end)
223 request_resource(res, &kernel_code);
224 if (kernel_data.start >= res->start &&
225 kernel_data.end <= res->end)
226 request_resource(res, &kernel_data);
227 }
228}
229
230u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
231
232void __init setup_arch(char **cmdline_p)
233{
234 pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
235
236 sprintf(init_utsname()->machine, UTS_MACHINE);
237 init_mm.start_code = (unsigned long) _text;
238 init_mm.end_code = (unsigned long) _etext;
239 init_mm.end_data = (unsigned long) _edata;
240 init_mm.brk = (unsigned long) _end;
241
242 *cmdline_p = boot_command_line;
243
244 early_fixmap_init();
245 early_ioremap_init();
246
247 setup_machine_fdt(__fdt_pointer);
248
249 parse_early_param();
250
251
252
253
254
255 local_async_enable();
256
257
258
259
260
261 cpu_uninstall_idmap();
262
263 xen_early_init();
264 efi_init();
265 arm64_memblock_init();
266
267 paging_init();
268
269 acpi_table_upgrade();
270
271
272 acpi_boot_table_init();
273
274 if (acpi_disabled)
275 unflatten_device_tree();
276
277 bootmem_init();
278
279 kasan_init();
280
281 request_standard_resources();
282
283 early_ioremap_reset();
284
285 if (acpi_disabled)
286 psci_dt_init();
287 else
288 psci_acpi_init();
289
290 cpu_read_bootcpu_ops();
291 smp_init_cpus();
292 smp_build_mpidr_hash();
293
294#ifdef CONFIG_VT
295#if defined(CONFIG_VGA_CONSOLE)
296 conswitchp = &vga_con;
297#elif defined(CONFIG_DUMMY_CONSOLE)
298 conswitchp = &dummy_con;
299#endif
300#endif
301 if (boot_args[1] || boot_args[2] || boot_args[3]) {
302 pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
303 "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
304 "This indicates a broken bootloader or old kernel\n",
305 boot_args[1], boot_args[2], boot_args[3]);
306 }
307}
308
309static int __init topology_init(void)
310{
311 int i;
312
313 for_each_online_node(i)
314 register_one_node(i);
315
316 for_each_possible_cpu(i) {
317 struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
318 cpu->hotpluggable = 1;
319 register_cpu(cpu, i);
320 }
321
322 return 0;
323}
324subsys_initcall(topology_init);
325
326
327
328
329static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
330 void *p)
331{
332 u64 const kaslr_offset = kimage_vaddr - KIMAGE_VADDR;
333
334 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset > 0) {
335 pr_emerg("Kernel Offset: 0x%llx from 0x%lx\n",
336 kaslr_offset, KIMAGE_VADDR);
337 } else {
338 pr_emerg("Kernel Offset: disabled\n");
339 }
340 return 0;
341}
342
343static struct notifier_block kernel_offset_notifier = {
344 .notifier_call = dump_kernel_offset
345};
346
347static int __init register_kernel_offset_dumper(void)
348{
349 atomic_notifier_chain_register(&panic_notifier_list,
350 &kernel_offset_notifier);
351 return 0;
352}
353__initcall(register_kernel_offset_dumper);
354