1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
4 * Chen Liqin <liqin.chen@sunplusct.com>
5 * Lennox Wu <lennox.wu@sunplusct.com>
6 * Copyright (C) 2012 Regents of the University of California
7 * Copyright (C) 2020 FORTH-ICS/CARV
8 * Nick Kossifidis <mick@ics.forth.gr>
9 */
10
11 #include <linux/acpi.h>
12 #include <linux/cpu.h>
13 #include <linux/init.h>
14 #include <linux/mm.h>
15 #include <linux/memblock.h>
16 #include <linux/sched.h>
17 #include <linux/console.h>
18 #include <linux/screen_info.h>
19 #include <linux/of_fdt.h>
20 #include <linux/sched/task.h>
21 #include <linux/smp.h>
22 #include <linux/efi.h>
23 #include <linux/crash_dump.h>
24 #include <linux/panic_notifier.h>
25
26 #include <asm/acpi.h>
27 #include <asm/alternative.h>
28 #include <asm/cacheflush.h>
29 #include <asm/cpufeature.h>
30 #include <asm/cpu_ops.h>
31 #include <asm/early_ioremap.h>
32 #include <asm/pgtable.h>
33 #include <asm/setup.h>
34 #include <asm/set_memory.h>
35 #include <asm/sections.h>
36 #include <asm/sbi.h>
37 #include <asm/tlbflush.h>
38 #include <asm/thread_info.h>
39 #include <asm/kasan.h>
40 #include <asm/efi.h>
41
42 #include "head.h"
43
44 #if defined(CONFIG_EFI)
45 struct screen_info screen_info __section(".data");
46 #endif
47
48 /*
49 * The lucky hart to first increment this variable will boot the other cores.
50 * This is used before the kernel initializes the BSS so it can't be in the
51 * BSS.
52 */
53 atomic_t hart_lottery __section(".sdata")
54 #ifdef CONFIG_XIP_KERNEL
55 = ATOMIC_INIT(0xC001BEEF)
56 #endif
57 ;
58 unsigned long boot_cpu_hartid;
59 static DEFINE_PER_CPU(struct cpu, cpu_devices);
60
61 /*
62 * Place kernel memory regions on the resource tree so that
63 * kexec-tools can retrieve them from /proc/iomem. While there
64 * also add "System RAM" regions for compatibility with other
65 * archs, and the rest of the known regions for completeness.
66 */
67 static struct resource kimage_res = { .name = "Kernel image", };
68 static struct resource code_res = { .name = "Kernel code", };
69 static struct resource data_res = { .name = "Kernel data", };
70 static struct resource rodata_res = { .name = "Kernel rodata", };
71 static struct resource bss_res = { .name = "Kernel bss", };
72 #ifdef CONFIG_CRASH_DUMP
73 static struct resource elfcorehdr_res = { .name = "ELF Core hdr", };
74 #endif
75
add_resource(struct resource * parent,struct resource * res)76 static int __init add_resource(struct resource *parent,
77 struct resource *res)
78 {
79 int ret = 0;
80
81 ret = insert_resource(parent, res);
82 if (ret < 0) {
83 pr_err("Failed to add a %s resource at %llx\n",
84 res->name, (unsigned long long) res->start);
85 return ret;
86 }
87
88 return 1;
89 }
90
add_kernel_resources(void)91 static int __init add_kernel_resources(void)
92 {
93 int ret = 0;
94
95 /*
96 * The memory region of the kernel image is continuous and
97 * was reserved on setup_bootmem, register it here as a
98 * resource, with the various segments of the image as
99 * child nodes.
100 */
101
102 code_res.start = __pa_symbol(_text);
103 code_res.end = __pa_symbol(_etext) - 1;
104 code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
105
106 rodata_res.start = __pa_symbol(__start_rodata);
107 rodata_res.end = __pa_symbol(__end_rodata) - 1;
108 rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
109
110 data_res.start = __pa_symbol(_data);
111 data_res.end = __pa_symbol(_edata) - 1;
112 data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
113
114 bss_res.start = __pa_symbol(__bss_start);
115 bss_res.end = __pa_symbol(__bss_stop) - 1;
116 bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
117
118 kimage_res.start = code_res.start;
119 kimage_res.end = bss_res.end;
120 kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
121
122 ret = add_resource(&iomem_resource, &kimage_res);
123 if (ret < 0)
124 return ret;
125
126 ret = add_resource(&kimage_res, &code_res);
127 if (ret < 0)
128 return ret;
129
130 ret = add_resource(&kimage_res, &rodata_res);
131 if (ret < 0)
132 return ret;
133
134 ret = add_resource(&kimage_res, &data_res);
135 if (ret < 0)
136 return ret;
137
138 ret = add_resource(&kimage_res, &bss_res);
139
140 return ret;
141 }
142
init_resources(void)143 static void __init init_resources(void)
144 {
145 struct memblock_region *region = NULL;
146 struct resource *res = NULL;
147 struct resource *mem_res = NULL;
148 size_t mem_res_sz = 0;
149 int num_resources = 0, res_idx = 0;
150 int ret = 0;
151
152 /* + 1 as memblock_alloc() might increase memblock.reserved.cnt */
153 num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
154 res_idx = num_resources - 1;
155
156 mem_res_sz = num_resources * sizeof(*mem_res);
157 mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES);
158 if (!mem_res)
159 panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz);
160
161 /*
162 * Start by adding the reserved regions, if they overlap
163 * with /memory regions, insert_resource later on will take
164 * care of it.
165 */
166 ret = add_kernel_resources();
167 if (ret < 0)
168 goto error;
169
170 #ifdef CONFIG_KEXEC_CORE
171 if (crashk_res.start != crashk_res.end) {
172 ret = add_resource(&iomem_resource, &crashk_res);
173 if (ret < 0)
174 goto error;
175 }
176 if (crashk_low_res.start != crashk_low_res.end) {
177 ret = add_resource(&iomem_resource, &crashk_low_res);
178 if (ret < 0)
179 goto error;
180 }
181 #endif
182
183 #ifdef CONFIG_CRASH_DUMP
184 if (elfcorehdr_size > 0) {
185 elfcorehdr_res.start = elfcorehdr_addr;
186 elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1;
187 elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
188 add_resource(&iomem_resource, &elfcorehdr_res);
189 }
190 #endif
191
192 for_each_reserved_mem_region(region) {
193 res = &mem_res[res_idx--];
194
195 res->name = "Reserved";
196 res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
197 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
198 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
199
200 /*
201 * Ignore any other reserved regions within
202 * system memory.
203 */
204 if (memblock_is_memory(res->start)) {
205 /* Re-use this pre-allocated resource */
206 res_idx++;
207 continue;
208 }
209
210 ret = add_resource(&iomem_resource, res);
211 if (ret < 0)
212 goto error;
213 }
214
215 /* Add /memory regions to the resource tree */
216 for_each_mem_region(region) {
217 res = &mem_res[res_idx--];
218
219 if (unlikely(memblock_is_nomap(region))) {
220 res->name = "Reserved";
221 res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
222 } else {
223 res->name = "System RAM";
224 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
225 }
226
227 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
228 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
229
230 ret = add_resource(&iomem_resource, res);
231 if (ret < 0)
232 goto error;
233 }
234
235 /* Clean-up any unused pre-allocated resources */
236 if (res_idx >= 0)
237 memblock_free(mem_res, (res_idx + 1) * sizeof(*mem_res));
238 return;
239
240 error:
241 /* Better an empty resource tree than an inconsistent one */
242 release_child_resources(&iomem_resource);
243 memblock_free(mem_res, mem_res_sz);
244 }
245
246
parse_dtb(void)247 static void __init parse_dtb(void)
248 {
249 /* Early scan of device tree from init memory */
250 if (early_init_dt_scan(dtb_early_va, dtb_early_pa)) {
251 const char *name = of_flat_dt_get_machine_name();
252
253 if (name) {
254 pr_info("Machine model: %s\n", name);
255 dump_stack_set_arch_desc("%s (DT)", name);
256 }
257 } else {
258 pr_err("No DTB passed to the kernel\n");
259 }
260
261 #ifdef CONFIG_CMDLINE_FORCE
262 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
263 pr_info("Forcing kernel command line to: %s\n", boot_command_line);
264 #endif
265 }
266
267 extern void __init init_rt_signal_env(void);
268
setup_arch(char ** cmdline_p)269 void __init setup_arch(char **cmdline_p)
270 {
271 parse_dtb();
272 setup_initial_init_mm(_stext, _etext, _edata, _end);
273
274 *cmdline_p = boot_command_line;
275
276 early_ioremap_setup();
277 sbi_init();
278 jump_label_init();
279 parse_early_param();
280
281 efi_init();
282 paging_init();
283
284 /* Parse the ACPI tables for possible boot-time configuration */
285 acpi_boot_table_init();
286
287 #if IS_ENABLED(CONFIG_BUILTIN_DTB)
288 unflatten_and_copy_device_tree();
289 #else
290 unflatten_device_tree();
291 #endif
292 misc_mem_init();
293
294 init_resources();
295
296 #ifdef CONFIG_KASAN
297 kasan_init();
298 #endif
299
300 #ifdef CONFIG_SMP
301 setup_smp();
302 #endif
303
304 if (!acpi_disabled)
305 acpi_init_rintc_map();
306
307 riscv_init_cbo_blocksizes();
308 riscv_fill_hwcap();
309 apply_boot_alternatives();
310 init_rt_signal_env();
311
312 if (IS_ENABLED(CONFIG_RISCV_ISA_ZICBOM) &&
313 riscv_isa_extension_available(NULL, ZICBOM))
314 riscv_noncoherent_supported();
315 riscv_set_dma_cache_alignment();
316
317 riscv_user_isa_enable();
318 }
319
topology_init(void)320 static int __init topology_init(void)
321 {
322 int i, ret;
323
324 for_each_possible_cpu(i) {
325 struct cpu *cpu = &per_cpu(cpu_devices, i);
326
327 cpu->hotpluggable = cpu_has_hotplug(i);
328 ret = register_cpu(cpu, i);
329 if (unlikely(ret))
330 pr_warn("Warning: %s: register_cpu %d failed (%d)\n",
331 __func__, i, ret);
332 }
333
334 return 0;
335 }
336 subsys_initcall(topology_init);
337
free_initmem(void)338 void free_initmem(void)
339 {
340 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {
341 set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end), set_memory_rw_nx);
342 if (IS_ENABLED(CONFIG_64BIT))
343 set_kernel_memory(__init_begin, __init_end, set_memory_nx);
344 }
345
346 free_initmem_default(POISON_FREE_INITMEM);
347 }
348
dump_kernel_offset(struct notifier_block * self,unsigned long v,void * p)349 static int dump_kernel_offset(struct notifier_block *self,
350 unsigned long v, void *p)
351 {
352 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
353 kernel_map.virt_offset,
354 KERNEL_LINK_ADDR);
355
356 return 0;
357 }
358
359 static struct notifier_block kernel_offset_notifier = {
360 .notifier_call = dump_kernel_offset
361 };
362
register_kernel_offset_dumper(void)363 static int __init register_kernel_offset_dumper(void)
364 {
365 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
366 atomic_notifier_chain_register(&panic_notifier_list,
367 &kernel_offset_notifier);
368
369 return 0;
370 }
371 device_initcall(register_kernel_offset_dumper);
372