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