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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 | ||
20 | #include <linux/export.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/stddef.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/utsname.h> | |
26 | #include <linux/initrd.h> | |
27 | #include <linux/console.h> | |
28 | #include <linux/bootmem.h> | |
29 | #include <linux/seq_file.h> | |
30 | #include <linux/screen_info.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/kexec.h> | |
33 | #include <linux/crash_dump.h> | |
34 | #include <linux/root_dev.h> | |
de79a64d | 35 | #include <linux/clk-provider.h> |
9703d9d7 CM |
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> | |
d6bafb9b | 43 | #include <linux/of_platform.h> |
9703d9d7 CM |
44 | |
45 | #include <asm/cputype.h> | |
46 | #include <asm/elf.h> | |
47 | #include <asm/cputable.h> | |
48 | #include <asm/sections.h> | |
49 | #include <asm/setup.h> | |
4c7aa002 | 50 | #include <asm/smp_plat.h> |
9703d9d7 CM |
51 | #include <asm/cacheflush.h> |
52 | #include <asm/tlbflush.h> | |
53 | #include <asm/traps.h> | |
54 | #include <asm/memblock.h> | |
e790f1de | 55 | #include <asm/psci.h> |
9703d9d7 CM |
56 | |
57 | unsigned int processor_id; | |
58 | EXPORT_SYMBOL(processor_id); | |
59 | ||
60 | unsigned int elf_hwcap __read_mostly; | |
61 | EXPORT_SYMBOL_GPL(elf_hwcap); | |
62 | ||
63 | static const char *cpu_name; | |
64 | static const char *machine_name; | |
65 | phys_addr_t __fdt_pointer __initdata; | |
66 | ||
67 | /* | |
68 | * Standard memory resources | |
69 | */ | |
70 | static struct resource mem_res[] = { | |
71 | { | |
72 | .name = "Kernel code", | |
73 | .start = 0, | |
74 | .end = 0, | |
75 | .flags = IORESOURCE_MEM | |
76 | }, | |
77 | { | |
78 | .name = "Kernel data", | |
79 | .start = 0, | |
80 | .end = 0, | |
81 | .flags = IORESOURCE_MEM | |
82 | } | |
83 | }; | |
84 | ||
85 | #define kernel_code mem_res[0] | |
86 | #define kernel_data mem_res[1] | |
87 | ||
88 | void __init early_print(const char *str, ...) | |
89 | { | |
90 | char buf[256]; | |
91 | va_list ap; | |
92 | ||
93 | va_start(ap, str); | |
94 | vsnprintf(buf, sizeof(buf), str, ap); | |
95 | va_end(ap); | |
96 | ||
97 | printk("%s", buf); | |
98 | } | |
99 | ||
100 | static void __init setup_processor(void) | |
101 | { | |
102 | struct cpu_info *cpu_info; | |
103 | ||
104 | /* | |
105 | * locate processor in the list of supported processor | |
106 | * types. The linker builds this table for us from the | |
107 | * entries in arch/arm/mm/proc.S | |
108 | */ | |
109 | cpu_info = lookup_processor_type(read_cpuid_id()); | |
110 | if (!cpu_info) { | |
111 | printk("CPU configuration botched (ID %08x), unable to continue.\n", | |
112 | read_cpuid_id()); | |
113 | while (1); | |
114 | } | |
115 | ||
116 | cpu_name = cpu_info->cpu_name; | |
117 | ||
118 | printk("CPU: %s [%08x] revision %d\n", | |
119 | cpu_name, read_cpuid_id(), read_cpuid_id() & 15); | |
120 | ||
121 | sprintf(init_utsname()->machine, "aarch64"); | |
122 | elf_hwcap = 0; | |
123 | } | |
124 | ||
125 | static void __init setup_machine_fdt(phys_addr_t dt_phys) | |
126 | { | |
127 | struct boot_param_header *devtree; | |
128 | unsigned long dt_root; | |
129 | ||
130 | /* Check we have a non-NULL DT pointer */ | |
131 | if (!dt_phys) { | |
132 | early_print("\n" | |
133 | "Error: NULL or invalid device tree blob\n" | |
134 | "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n" | |
135 | "\nPlease check your bootloader.\n"); | |
136 | ||
137 | while (true) | |
138 | cpu_relax(); | |
139 | ||
140 | } | |
141 | ||
142 | devtree = phys_to_virt(dt_phys); | |
143 | ||
144 | /* Check device tree validity */ | |
145 | if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) { | |
146 | early_print("\n" | |
147 | "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n" | |
148 | "Expected 0x%x, found 0x%x\n" | |
149 | "\nPlease check your bootloader.\n", | |
150 | dt_phys, devtree, OF_DT_HEADER, | |
151 | be32_to_cpu(devtree->magic)); | |
152 | ||
153 | while (true) | |
154 | cpu_relax(); | |
155 | } | |
156 | ||
157 | initial_boot_params = devtree; | |
158 | dt_root = of_get_flat_dt_root(); | |
159 | ||
160 | machine_name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
161 | if (!machine_name) | |
162 | machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
163 | if (!machine_name) | |
164 | machine_name = "<unknown>"; | |
165 | pr_info("Machine: %s\n", machine_name); | |
166 | ||
167 | /* Retrieve various information from the /chosen node */ | |
168 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
169 | /* Initialize {size,address}-cells info */ | |
170 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
171 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
172 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
173 | } | |
174 | ||
175 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) | |
176 | { | |
f71a1a42 | 177 | base &= PAGE_MASK; |
9703d9d7 | 178 | size &= PAGE_MASK; |
f71a1a42 CM |
179 | if (base + size < PHYS_OFFSET) { |
180 | pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", | |
181 | base, base + size); | |
182 | return; | |
183 | } | |
184 | if (base < PHYS_OFFSET) { | |
185 | pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", | |
186 | base, PHYS_OFFSET); | |
187 | size -= PHYS_OFFSET - base; | |
188 | base = PHYS_OFFSET; | |
189 | } | |
9703d9d7 CM |
190 | memblock_add(base, size); |
191 | } | |
192 | ||
193 | void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
194 | { | |
195 | return __va(memblock_alloc(size, align)); | |
196 | } | |
197 | ||
198 | /* | |
199 | * Limit the memory size that was specified via FDT. | |
200 | */ | |
201 | static int __init early_mem(char *p) | |
202 | { | |
203 | phys_addr_t limit; | |
204 | ||
205 | if (!p) | |
206 | return 1; | |
207 | ||
208 | limit = memparse(p, &p) & PAGE_MASK; | |
209 | pr_notice("Memory limited to %lldMB\n", limit >> 20); | |
210 | ||
211 | memblock_enforce_memory_limit(limit); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | early_param("mem", early_mem); | |
216 | ||
217 | static void __init request_standard_resources(void) | |
218 | { | |
219 | struct memblock_region *region; | |
220 | struct resource *res; | |
221 | ||
222 | kernel_code.start = virt_to_phys(_text); | |
223 | kernel_code.end = virt_to_phys(_etext - 1); | |
224 | kernel_data.start = virt_to_phys(_sdata); | |
225 | kernel_data.end = virt_to_phys(_end - 1); | |
226 | ||
227 | for_each_memblock(memory, region) { | |
228 | res = alloc_bootmem_low(sizeof(*res)); | |
229 | res->name = "System RAM"; | |
230 | res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); | |
231 | res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; | |
232 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
233 | ||
234 | request_resource(&iomem_resource, res); | |
235 | ||
236 | if (kernel_code.start >= res->start && | |
237 | kernel_code.end <= res->end) | |
238 | request_resource(res, &kernel_code); | |
239 | if (kernel_data.start >= res->start && | |
240 | kernel_data.end <= res->end) | |
241 | request_resource(res, &kernel_data); | |
242 | } | |
243 | } | |
244 | ||
4c7aa002 JM |
245 | u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; |
246 | ||
9703d9d7 CM |
247 | void __init setup_arch(char **cmdline_p) |
248 | { | |
249 | setup_processor(); | |
250 | ||
251 | setup_machine_fdt(__fdt_pointer); | |
252 | ||
253 | init_mm.start_code = (unsigned long) _text; | |
254 | init_mm.end_code = (unsigned long) _etext; | |
255 | init_mm.end_data = (unsigned long) _edata; | |
256 | init_mm.brk = (unsigned long) _end; | |
257 | ||
258 | *cmdline_p = boot_command_line; | |
259 | ||
260 | parse_early_param(); | |
261 | ||
262 | arm64_memblock_init(); | |
263 | ||
264 | paging_init(); | |
265 | request_standard_resources(); | |
266 | ||
267 | unflatten_device_tree(); | |
268 | ||
e790f1de WD |
269 | psci_init(); |
270 | ||
4c7aa002 | 271 | cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK; |
9703d9d7 CM |
272 | #ifdef CONFIG_SMP |
273 | smp_init_cpus(); | |
274 | #endif | |
275 | ||
276 | #ifdef CONFIG_VT | |
277 | #if defined(CONFIG_VGA_CONSOLE) | |
278 | conswitchp = &vga_con; | |
279 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
280 | conswitchp = &dummy_con; | |
281 | #endif | |
282 | #endif | |
283 | } | |
284 | ||
de79a64d CM |
285 | static int __init arm64_of_clk_init(void) |
286 | { | |
287 | of_clk_init(NULL); | |
288 | return 0; | |
289 | } | |
290 | arch_initcall(arm64_of_clk_init); | |
291 | ||
9703d9d7 CM |
292 | static DEFINE_PER_CPU(struct cpu, cpu_data); |
293 | ||
294 | static int __init topology_init(void) | |
295 | { | |
296 | int i; | |
297 | ||
298 | for_each_possible_cpu(i) { | |
299 | struct cpu *cpu = &per_cpu(cpu_data, i); | |
300 | cpu->hotpluggable = 1; | |
301 | register_cpu(cpu, i); | |
302 | } | |
303 | ||
304 | return 0; | |
305 | } | |
306 | subsys_initcall(topology_init); | |
307 | ||
d6bafb9b CM |
308 | static int __init arm64_device_probe(void) |
309 | { | |
310 | of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); | |
311 | return 0; | |
312 | } | |
313 | device_initcall(arm64_device_probe); | |
314 | ||
9703d9d7 CM |
315 | static const char *hwcap_str[] = { |
316 | "fp", | |
317 | "asimd", | |
318 | NULL | |
319 | }; | |
320 | ||
321 | static int c_show(struct seq_file *m, void *v) | |
322 | { | |
323 | int i; | |
324 | ||
325 | seq_printf(m, "Processor\t: %s rev %d (%s)\n", | |
326 | cpu_name, read_cpuid_id() & 15, ELF_PLATFORM); | |
327 | ||
328 | for_each_online_cpu(i) { | |
329 | /* | |
330 | * glibc reads /proc/cpuinfo to determine the number of | |
331 | * online processors, looking for lines beginning with | |
332 | * "processor". Give glibc what it expects. | |
333 | */ | |
334 | #ifdef CONFIG_SMP | |
335 | seq_printf(m, "processor\t: %d\n", i); | |
336 | #endif | |
337 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", | |
338 | loops_per_jiffy / (500000UL/HZ), | |
339 | loops_per_jiffy / (5000UL/HZ) % 100); | |
340 | } | |
341 | ||
342 | /* dump out the processor features */ | |
343 | seq_puts(m, "Features\t: "); | |
344 | ||
345 | for (i = 0; hwcap_str[i]; i++) | |
346 | if (elf_hwcap & (1 << i)) | |
347 | seq_printf(m, "%s ", hwcap_str[i]); | |
348 | ||
349 | seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); | |
350 | seq_printf(m, "CPU architecture: AArch64\n"); | |
351 | seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15); | |
352 | seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff); | |
353 | seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); | |
354 | ||
355 | seq_puts(m, "\n"); | |
356 | ||
357 | seq_printf(m, "Hardware\t: %s\n", machine_name); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static void *c_start(struct seq_file *m, loff_t *pos) | |
363 | { | |
364 | return *pos < 1 ? (void *)1 : NULL; | |
365 | } | |
366 | ||
367 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
368 | { | |
369 | ++*pos; | |
370 | return NULL; | |
371 | } | |
372 | ||
373 | static void c_stop(struct seq_file *m, void *v) | |
374 | { | |
375 | } | |
376 | ||
377 | const struct seq_operations cpuinfo_op = { | |
378 | .start = c_start, | |
379 | .next = c_next, | |
380 | .stop = c_stop, | |
381 | .show = c_show | |
382 | }; |