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9703d9d7 CM |
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 | ||
37655163 | 20 | #include <linux/acpi.h> |
9703d9d7 CM |
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> | |
a41dc0e8 | 29 | #include <linux/cache.h> |
9703d9d7 | 30 | #include <linux/bootmem.h> |
9703d9d7 CM |
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> | |
f84d0275 | 43 | #include <linux/efi.h> |
bff60792 | 44 | #include <linux/psci.h> |
9164bb4a | 45 | #include <linux/sched/task.h> |
2077be67 | 46 | #include <linux/mm.h> |
9703d9d7 | 47 | |
37655163 | 48 | #include <asm/acpi.h> |
bf4b558e | 49 | #include <asm/fixmap.h> |
df857416 | 50 | #include <asm/cpu.h> |
9703d9d7 CM |
51 | #include <asm/cputype.h> |
52 | #include <asm/elf.h> | |
930da09f | 53 | #include <asm/cpufeature.h> |
e8765b26 | 54 | #include <asm/cpu_ops.h> |
39d114dd | 55 | #include <asm/kasan.h> |
1a2db300 | 56 | #include <asm/numa.h> |
9703d9d7 CM |
57 | #include <asm/sections.h> |
58 | #include <asm/setup.h> | |
4c7aa002 | 59 | #include <asm/smp_plat.h> |
9703d9d7 CM |
60 | #include <asm/cacheflush.h> |
61 | #include <asm/tlbflush.h> | |
62 | #include <asm/traps.h> | |
63 | #include <asm/memblock.h> | |
f84d0275 | 64 | #include <asm/efi.h> |
5882bfef | 65 | #include <asm/xen/hypervisor.h> |
9e8e865b | 66 | #include <asm/mmu_context.h> |
9703d9d7 | 67 | |
9703d9d7 CM |
68 | phys_addr_t __fdt_pointer __initdata; |
69 | ||
70 | /* | |
71 | * Standard memory resources | |
72 | */ | |
73 | static struct resource mem_res[] = { | |
74 | { | |
75 | .name = "Kernel code", | |
76 | .start = 0, | |
77 | .end = 0, | |
35d98e93 | 78 | .flags = IORESOURCE_SYSTEM_RAM |
9703d9d7 CM |
79 | }, |
80 | { | |
81 | .name = "Kernel data", | |
82 | .start = 0, | |
83 | .end = 0, | |
35d98e93 | 84 | .flags = IORESOURCE_SYSTEM_RAM |
9703d9d7 CM |
85 | } |
86 | }; | |
87 | ||
88 | #define kernel_code mem_res[0] | |
89 | #define kernel_data mem_res[1] | |
90 | ||
da9c177d AB |
91 | /* |
92 | * The recorded values of x0 .. x3 upon kernel entry. | |
93 | */ | |
94 | u64 __cacheline_aligned boot_args[4]; | |
95 | ||
71586276 WD |
96 | void __init smp_setup_processor_id(void) |
97 | { | |
80708677 MR |
98 | u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK; |
99 | cpu_logical_map(0) = mpidr; | |
100 | ||
71586276 WD |
101 | /* |
102 | * clear __my_cpu_offset on boot CPU to avoid hang caused by | |
103 | * using percpu variable early, for example, lockdep will | |
104 | * access percpu variable inside lock_release | |
105 | */ | |
106 | set_my_cpu_offset(0); | |
80708677 | 107 | pr_info("Booting Linux on physical CPU 0x%lx\n", (unsigned long)mpidr); |
71586276 WD |
108 | } |
109 | ||
6e15d0e0 SH |
110 | bool arch_match_cpu_phys_id(int cpu, u64 phys_id) |
111 | { | |
112 | return phys_id == cpu_logical_map(cpu); | |
113 | } | |
114 | ||
976d7d3f | 115 | struct mpidr_hash mpidr_hash; |
976d7d3f LP |
116 | /** |
117 | * smp_build_mpidr_hash - Pre-compute shifts required at each affinity | |
118 | * level in order to build a linear index from an | |
119 | * MPIDR value. Resulting algorithm is a collision | |
120 | * free hash carried out through shifting and ORing | |
121 | */ | |
122 | static void __init smp_build_mpidr_hash(void) | |
123 | { | |
124 | u32 i, affinity, fs[4], bits[4], ls; | |
125 | u64 mask = 0; | |
126 | /* | |
127 | * Pre-scan the list of MPIDRS and filter out bits that do | |
128 | * not contribute to affinity levels, ie they never toggle. | |
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 | * Find and stash the last and first bit set at all affinity levels to | |
135 | * check how many bits are required to represent them. | |
136 | */ | |
137 | for (i = 0; i < 4; i++) { | |
138 | affinity = MPIDR_AFFINITY_LEVEL(mask, i); | |
139 | /* | |
140 | * Find the MSB bit and LSB bits position | |
141 | * to determine how many bits are required | |
142 | * to express the affinity level. | |
143 | */ | |
144 | ls = fls(affinity); | |
145 | fs[i] = affinity ? ffs(affinity) - 1 : 0; | |
146 | bits[i] = ls - fs[i]; | |
147 | } | |
148 | /* | |
149 | * An index can be created from the MPIDR_EL1 by isolating the | |
150 | * significant bits at each affinity level and by shifting | |
151 | * them in order to compress the 32 bits values space to a | |
152 | * compressed set of values. This is equivalent to hashing | |
153 | * the MPIDR_EL1 through shifting and ORing. It is a collision free | |
154 | * hash though not minimal since some levels might contain a number | |
155 | * of CPUs that is not an exact power of 2 and their bit | |
156 | * representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}. | |
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 | * 4x is an arbitrary value used to warn on a hash table much bigger | |
175 | * than expected on most systems. | |
176 | */ | |
177 | if (mpidr_hash_size() > 4 * num_possible_cpus()) | |
178 | pr_warn("Large number of MPIDR hash buckets detected\n"); | |
976d7d3f | 179 | } |
137650aa | 180 | |
9703d9d7 CM |
181 | static void __init setup_machine_fdt(phys_addr_t dt_phys) |
182 | { | |
61bd93ce AB |
183 | void *dt_virt = fixmap_remap_fdt(dt_phys); |
184 | ||
185 | if (!dt_virt || !early_init_dt_scan(dt_virt)) { | |
186 | pr_crit("\n" | |
187 | "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n" | |
188 | "The dtb must be 8-byte aligned and must not exceed 2 MB in size\n" | |
189 | "\nPlease check your bootloader.", | |
190 | &dt_phys, dt_virt); | |
9703d9d7 CM |
191 | |
192 | while (true) | |
193 | cpu_relax(); | |
194 | } | |
5e39977e | 195 | |
44b82b77 | 196 | dump_stack_set_arch_desc("%s (DT)", of_flat_dt_get_machine_name()); |
9703d9d7 CM |
197 | } |
198 | ||
9703d9d7 CM |
199 | static void __init request_standard_resources(void) |
200 | { | |
201 | struct memblock_region *region; | |
202 | struct resource *res; | |
203 | ||
2077be67 LA |
204 | kernel_code.start = __pa_symbol(_text); |
205 | kernel_code.end = __pa_symbol(__init_begin - 1); | |
206 | kernel_data.start = __pa_symbol(_sdata); | |
207 | kernel_data.end = __pa_symbol(_end - 1); | |
9703d9d7 CM |
208 | |
209 | for_each_memblock(memory, region) { | |
210 | res = alloc_bootmem_low(sizeof(*res)); | |
e7cd1903 AT |
211 | if (memblock_is_nomap(region)) { |
212 | res->name = "reserved"; | |
79ba11d2 | 213 | res->flags = IORESOURCE_MEM; |
e7cd1903 AT |
214 | } else { |
215 | res->name = "System RAM"; | |
216 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; | |
217 | } | |
9703d9d7 CM |
218 | res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); |
219 | res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; | |
9703d9d7 CM |
220 | |
221 | request_resource(&iomem_resource, res); | |
222 | ||
223 | if (kernel_code.start >= res->start && | |
224 | kernel_code.end <= res->end) | |
225 | request_resource(res, &kernel_code); | |
226 | if (kernel_data.start >= res->start && | |
227 | kernel_data.end <= res->end) | |
228 | request_resource(res, &kernel_data); | |
229 | } | |
230 | } | |
231 | ||
4c7aa002 JM |
232 | u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; |
233 | ||
9703d9d7 CM |
234 | void __init setup_arch(char **cmdline_p) |
235 | { | |
4b998ff1 | 236 | pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id()); |
9703d9d7 | 237 | |
cfa88c79 | 238 | sprintf(init_utsname()->machine, UTS_MACHINE); |
9703d9d7 CM |
239 | init_mm.start_code = (unsigned long) _text; |
240 | init_mm.end_code = (unsigned long) _etext; | |
241 | init_mm.end_data = (unsigned long) _edata; | |
242 | init_mm.brk = (unsigned long) _end; | |
243 | ||
244 | *cmdline_p = boot_command_line; | |
245 | ||
af86e597 | 246 | early_fixmap_init(); |
bf4b558e | 247 | early_ioremap_init(); |
0bf757c7 | 248 | |
61bd93ce AB |
249 | setup_machine_fdt(__fdt_pointer); |
250 | ||
9703d9d7 CM |
251 | parse_early_param(); |
252 | ||
7a9c43be JM |
253 | /* |
254 | * Unmask asynchronous aborts after bringing up possible earlycon. | |
255 | * (Report possible System Errors once we can report this occurred) | |
256 | */ | |
257 | local_async_enable(); | |
258 | ||
86ccce89 MR |
259 | /* |
260 | * TTBR0 is only used for the identity mapping at this stage. Make it | |
261 | * point to zero page to avoid speculatively fetching new entries. | |
262 | */ | |
263 | cpu_uninstall_idmap(); | |
264 | ||
9b08aaa3 | 265 | xen_early_init(); |
f84d0275 | 266 | efi_init(); |
9703d9d7 CM |
267 | arm64_memblock_init(); |
268 | ||
38b04a74 JM |
269 | paging_init(); |
270 | ||
271 | acpi_table_upgrade(); | |
272 | ||
37655163 AS |
273 | /* Parse the ACPI tables for possible boot-time configuration */ |
274 | acpi_boot_table_init(); | |
275 | ||
3194ac6e DD |
276 | if (acpi_disabled) |
277 | unflatten_device_tree(); | |
278 | ||
279 | bootmem_init(); | |
280 | ||
39d114dd AR |
281 | kasan_init(); |
282 | ||
9703d9d7 CM |
283 | request_standard_resources(); |
284 | ||
0e63ea48 | 285 | early_ioremap_reset(); |
f84d0275 | 286 | |
3194ac6e | 287 | if (acpi_disabled) |
7c59a3df | 288 | psci_dt_init(); |
3194ac6e | 289 | else |
7c59a3df | 290 | psci_acpi_init(); |
3194ac6e | 291 | |
0f078336 | 292 | cpu_read_bootcpu_ops(); |
0f078336 | 293 | smp_init_cpus(); |
976d7d3f | 294 | smp_build_mpidr_hash(); |
9703d9d7 | 295 | |
39bc88e5 CM |
296 | #ifdef CONFIG_ARM64_SW_TTBR0_PAN |
297 | /* | |
298 | * Make sure init_thread_info.ttbr0 always generates translation | |
299 | * faults in case uaccess_enable() is inadvertently called by the init | |
300 | * thread. | |
301 | */ | |
cbb999dd | 302 | init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page); |
39bc88e5 CM |
303 | #endif |
304 | ||
9703d9d7 CM |
305 | #ifdef CONFIG_VT |
306 | #if defined(CONFIG_VGA_CONSOLE) | |
307 | conswitchp = &vga_con; | |
308 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
309 | conswitchp = &dummy_con; | |
310 | #endif | |
311 | #endif | |
da9c177d AB |
312 | if (boot_args[1] || boot_args[2] || boot_args[3]) { |
313 | pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n" | |
314 | "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n" | |
315 | "This indicates a broken bootloader or old kernel\n", | |
316 | boot_args[1], boot_args[2], boot_args[3]); | |
317 | } | |
9703d9d7 CM |
318 | } |
319 | ||
9703d9d7 CM |
320 | static int __init topology_init(void) |
321 | { | |
322 | int i; | |
323 | ||
1a2db300 GK |
324 | for_each_online_node(i) |
325 | register_one_node(i); | |
326 | ||
9703d9d7 | 327 | for_each_possible_cpu(i) { |
df857416 | 328 | struct cpu *cpu = &per_cpu(cpu_data.cpu, i); |
9703d9d7 CM |
329 | cpu->hotpluggable = 1; |
330 | register_cpu(cpu, i); | |
331 | } | |
332 | ||
333 | return 0; | |
334 | } | |
335 | subsys_initcall(topology_init); | |
f80fb3a3 AB |
336 | |
337 | /* | |
338 | * Dump out kernel offset information on panic. | |
339 | */ | |
340 | static int dump_kernel_offset(struct notifier_block *self, unsigned long v, | |
341 | void *p) | |
342 | { | |
7ede8665 | 343 | const unsigned long offset = kaslr_offset(); |
f80fb3a3 | 344 | |
7ede8665 AP |
345 | if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) { |
346 | pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", | |
347 | offset, KIMAGE_VADDR); | |
f80fb3a3 AB |
348 | } else { |
349 | pr_emerg("Kernel Offset: disabled\n"); | |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static struct notifier_block kernel_offset_notifier = { | |
355 | .notifier_call = dump_kernel_offset | |
356 | }; | |
357 | ||
358 | static int __init register_kernel_offset_dumper(void) | |
359 | { | |
360 | atomic_notifier_chain_register(&panic_notifier_list, | |
361 | &kernel_offset_notifier); | |
362 | return 0; | |
363 | } | |
364 | __initcall(register_kernel_offset_dumper); |