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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> | |
35 | #include <linux/cpu.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <linux/smp.h> | |
38 | #include <linux/fs.h> | |
39 | #include <linux/proc_fs.h> | |
40 | #include <linux/memblock.h> | |
41 | #include <linux/of_fdt.h> | |
42 | ||
43 | #include <asm/cputype.h> | |
44 | #include <asm/elf.h> | |
45 | #include <asm/cputable.h> | |
46 | #include <asm/sections.h> | |
47 | #include <asm/setup.h> | |
48 | #include <asm/cacheflush.h> | |
49 | #include <asm/tlbflush.h> | |
50 | #include <asm/traps.h> | |
51 | #include <asm/memblock.h> | |
52 | ||
53 | unsigned int processor_id; | |
54 | EXPORT_SYMBOL(processor_id); | |
55 | ||
56 | unsigned int elf_hwcap __read_mostly; | |
57 | EXPORT_SYMBOL_GPL(elf_hwcap); | |
58 | ||
59 | static const char *cpu_name; | |
60 | static const char *machine_name; | |
61 | phys_addr_t __fdt_pointer __initdata; | |
62 | ||
63 | /* | |
64 | * Standard memory resources | |
65 | */ | |
66 | static struct resource mem_res[] = { | |
67 | { | |
68 | .name = "Kernel code", | |
69 | .start = 0, | |
70 | .end = 0, | |
71 | .flags = IORESOURCE_MEM | |
72 | }, | |
73 | { | |
74 | .name = "Kernel data", | |
75 | .start = 0, | |
76 | .end = 0, | |
77 | .flags = IORESOURCE_MEM | |
78 | } | |
79 | }; | |
80 | ||
81 | #define kernel_code mem_res[0] | |
82 | #define kernel_data mem_res[1] | |
83 | ||
84 | void __init early_print(const char *str, ...) | |
85 | { | |
86 | char buf[256]; | |
87 | va_list ap; | |
88 | ||
89 | va_start(ap, str); | |
90 | vsnprintf(buf, sizeof(buf), str, ap); | |
91 | va_end(ap); | |
92 | ||
93 | printk("%s", buf); | |
94 | } | |
95 | ||
96 | static void __init setup_processor(void) | |
97 | { | |
98 | struct cpu_info *cpu_info; | |
99 | ||
100 | /* | |
101 | * locate processor in the list of supported processor | |
102 | * types. The linker builds this table for us from the | |
103 | * entries in arch/arm/mm/proc.S | |
104 | */ | |
105 | cpu_info = lookup_processor_type(read_cpuid_id()); | |
106 | if (!cpu_info) { | |
107 | printk("CPU configuration botched (ID %08x), unable to continue.\n", | |
108 | read_cpuid_id()); | |
109 | while (1); | |
110 | } | |
111 | ||
112 | cpu_name = cpu_info->cpu_name; | |
113 | ||
114 | printk("CPU: %s [%08x] revision %d\n", | |
115 | cpu_name, read_cpuid_id(), read_cpuid_id() & 15); | |
116 | ||
117 | sprintf(init_utsname()->machine, "aarch64"); | |
118 | elf_hwcap = 0; | |
119 | } | |
120 | ||
121 | static void __init setup_machine_fdt(phys_addr_t dt_phys) | |
122 | { | |
123 | struct boot_param_header *devtree; | |
124 | unsigned long dt_root; | |
125 | ||
126 | /* Check we have a non-NULL DT pointer */ | |
127 | if (!dt_phys) { | |
128 | early_print("\n" | |
129 | "Error: NULL or invalid device tree blob\n" | |
130 | "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n" | |
131 | "\nPlease check your bootloader.\n"); | |
132 | ||
133 | while (true) | |
134 | cpu_relax(); | |
135 | ||
136 | } | |
137 | ||
138 | devtree = phys_to_virt(dt_phys); | |
139 | ||
140 | /* Check device tree validity */ | |
141 | if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) { | |
142 | early_print("\n" | |
143 | "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n" | |
144 | "Expected 0x%x, found 0x%x\n" | |
145 | "\nPlease check your bootloader.\n", | |
146 | dt_phys, devtree, OF_DT_HEADER, | |
147 | be32_to_cpu(devtree->magic)); | |
148 | ||
149 | while (true) | |
150 | cpu_relax(); | |
151 | } | |
152 | ||
153 | initial_boot_params = devtree; | |
154 | dt_root = of_get_flat_dt_root(); | |
155 | ||
156 | machine_name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
157 | if (!machine_name) | |
158 | machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
159 | if (!machine_name) | |
160 | machine_name = "<unknown>"; | |
161 | pr_info("Machine: %s\n", machine_name); | |
162 | ||
163 | /* Retrieve various information from the /chosen node */ | |
164 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
165 | /* Initialize {size,address}-cells info */ | |
166 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
167 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
168 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
169 | } | |
170 | ||
171 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) | |
172 | { | |
173 | size &= PAGE_MASK; | |
174 | memblock_add(base, size); | |
175 | } | |
176 | ||
177 | void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
178 | { | |
179 | return __va(memblock_alloc(size, align)); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Limit the memory size that was specified via FDT. | |
184 | */ | |
185 | static int __init early_mem(char *p) | |
186 | { | |
187 | phys_addr_t limit; | |
188 | ||
189 | if (!p) | |
190 | return 1; | |
191 | ||
192 | limit = memparse(p, &p) & PAGE_MASK; | |
193 | pr_notice("Memory limited to %lldMB\n", limit >> 20); | |
194 | ||
195 | memblock_enforce_memory_limit(limit); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | early_param("mem", early_mem); | |
200 | ||
201 | static void __init request_standard_resources(void) | |
202 | { | |
203 | struct memblock_region *region; | |
204 | struct resource *res; | |
205 | ||
206 | kernel_code.start = virt_to_phys(_text); | |
207 | kernel_code.end = virt_to_phys(_etext - 1); | |
208 | kernel_data.start = virt_to_phys(_sdata); | |
209 | kernel_data.end = virt_to_phys(_end - 1); | |
210 | ||
211 | for_each_memblock(memory, region) { | |
212 | res = alloc_bootmem_low(sizeof(*res)); | |
213 | res->name = "System RAM"; | |
214 | res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); | |
215 | res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; | |
216 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
217 | ||
218 | request_resource(&iomem_resource, res); | |
219 | ||
220 | if (kernel_code.start >= res->start && | |
221 | kernel_code.end <= res->end) | |
222 | request_resource(res, &kernel_code); | |
223 | if (kernel_data.start >= res->start && | |
224 | kernel_data.end <= res->end) | |
225 | request_resource(res, &kernel_data); | |
226 | } | |
227 | } | |
228 | ||
229 | void __init setup_arch(char **cmdline_p) | |
230 | { | |
231 | setup_processor(); | |
232 | ||
233 | setup_machine_fdt(__fdt_pointer); | |
234 | ||
235 | init_mm.start_code = (unsigned long) _text; | |
236 | init_mm.end_code = (unsigned long) _etext; | |
237 | init_mm.end_data = (unsigned long) _edata; | |
238 | init_mm.brk = (unsigned long) _end; | |
239 | ||
240 | *cmdline_p = boot_command_line; | |
241 | ||
242 | parse_early_param(); | |
243 | ||
244 | arm64_memblock_init(); | |
245 | ||
246 | paging_init(); | |
247 | request_standard_resources(); | |
248 | ||
249 | unflatten_device_tree(); | |
250 | ||
251 | #ifdef CONFIG_SMP | |
252 | smp_init_cpus(); | |
253 | #endif | |
254 | ||
255 | #ifdef CONFIG_VT | |
256 | #if defined(CONFIG_VGA_CONSOLE) | |
257 | conswitchp = &vga_con; | |
258 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
259 | conswitchp = &dummy_con; | |
260 | #endif | |
261 | #endif | |
262 | } | |
263 | ||
264 | static DEFINE_PER_CPU(struct cpu, cpu_data); | |
265 | ||
266 | static int __init topology_init(void) | |
267 | { | |
268 | int i; | |
269 | ||
270 | for_each_possible_cpu(i) { | |
271 | struct cpu *cpu = &per_cpu(cpu_data, i); | |
272 | cpu->hotpluggable = 1; | |
273 | register_cpu(cpu, i); | |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | subsys_initcall(topology_init); | |
279 | ||
280 | static const char *hwcap_str[] = { | |
281 | "fp", | |
282 | "asimd", | |
283 | NULL | |
284 | }; | |
285 | ||
286 | static int c_show(struct seq_file *m, void *v) | |
287 | { | |
288 | int i; | |
289 | ||
290 | seq_printf(m, "Processor\t: %s rev %d (%s)\n", | |
291 | cpu_name, read_cpuid_id() & 15, ELF_PLATFORM); | |
292 | ||
293 | for_each_online_cpu(i) { | |
294 | /* | |
295 | * glibc reads /proc/cpuinfo to determine the number of | |
296 | * online processors, looking for lines beginning with | |
297 | * "processor". Give glibc what it expects. | |
298 | */ | |
299 | #ifdef CONFIG_SMP | |
300 | seq_printf(m, "processor\t: %d\n", i); | |
301 | #endif | |
302 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", | |
303 | loops_per_jiffy / (500000UL/HZ), | |
304 | loops_per_jiffy / (5000UL/HZ) % 100); | |
305 | } | |
306 | ||
307 | /* dump out the processor features */ | |
308 | seq_puts(m, "Features\t: "); | |
309 | ||
310 | for (i = 0; hwcap_str[i]; i++) | |
311 | if (elf_hwcap & (1 << i)) | |
312 | seq_printf(m, "%s ", hwcap_str[i]); | |
313 | ||
314 | seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); | |
315 | seq_printf(m, "CPU architecture: AArch64\n"); | |
316 | seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15); | |
317 | seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff); | |
318 | seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); | |
319 | ||
320 | seq_puts(m, "\n"); | |
321 | ||
322 | seq_printf(m, "Hardware\t: %s\n", machine_name); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static void *c_start(struct seq_file *m, loff_t *pos) | |
328 | { | |
329 | return *pos < 1 ? (void *)1 : NULL; | |
330 | } | |
331 | ||
332 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
333 | { | |
334 | ++*pos; | |
335 | return NULL; | |
336 | } | |
337 | ||
338 | static void c_stop(struct seq_file *m, void *v) | |
339 | { | |
340 | } | |
341 | ||
342 | const struct seq_operations cpuinfo_op = { | |
343 | .start = c_start, | |
344 | .next = c_next, | |
345 | .stop = c_stop, | |
346 | .show = c_show | |
347 | }; |