1
2
3
4
5
6
7
8
9
10
11#include <linux/init.h>
12#include <linux/mm.h>
13#include <linux/memblock.h>
14#include <linux/sched.h>
15#include <linux/console.h>
16#include <linux/screen_info.h>
17#include <linux/of_fdt.h>
18#include <linux/of_platform.h>
19#include <linux/sched/task.h>
20#include <linux/smp.h>
21#include <linux/efi.h>
22#include <linux/crash_dump.h>
23
24#include <asm/cpu_ops.h>
25#include <asm/early_ioremap.h>
26#include <asm/pgtable.h>
27#include <asm/setup.h>
28#include <asm/set_memory.h>
29#include <asm/sections.h>
30#include <asm/sbi.h>
31#include <asm/tlbflush.h>
32#include <asm/thread_info.h>
33#include <asm/kasan.h>
34#include <asm/efi.h>
35
36#include "head.h"
37
38#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
39struct screen_info screen_info __section(".data") = {
40 .orig_video_lines = 30,
41 .orig_video_cols = 80,
42 .orig_video_mode = 0,
43 .orig_video_ega_bx = 0,
44 .orig_video_isVGA = 1,
45 .orig_video_points = 8
46};
47#endif
48
49
50
51
52
53
54atomic_t hart_lottery __section(".sdata")
55#ifdef CONFIG_XIP_KERNEL
56= ATOMIC_INIT(0xC001BEEF)
57#endif
58;
59unsigned long boot_cpu_hartid;
60static DEFINE_PER_CPU(struct cpu, cpu_devices);
61
62
63
64
65
66
67
68static struct resource kimage_res = { .name = "Kernel image", };
69static struct resource code_res = { .name = "Kernel code", };
70static struct resource data_res = { .name = "Kernel data", };
71static struct resource rodata_res = { .name = "Kernel rodata", };
72static struct resource bss_res = { .name = "Kernel bss", };
73#ifdef CONFIG_CRASH_DUMP
74static struct resource elfcorehdr_res = { .name = "ELF Core hdr", };
75#endif
76
77static int __init add_resource(struct resource *parent,
78 struct resource *res)
79{
80 int ret = 0;
81
82 ret = insert_resource(parent, res);
83 if (ret < 0) {
84 pr_err("Failed to add a %s resource at %llx\n",
85 res->name, (unsigned long long) res->start);
86 return ret;
87 }
88
89 return 1;
90}
91
92static int __init add_kernel_resources(void)
93{
94 int ret = 0;
95
96
97
98
99
100
101
102
103 code_res.start = __pa_symbol(_text);
104 code_res.end = __pa_symbol(_etext) - 1;
105 code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
106
107 rodata_res.start = __pa_symbol(__start_rodata);
108 rodata_res.end = __pa_symbol(__end_rodata) - 1;
109 rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
110
111 data_res.start = __pa_symbol(_data);
112 data_res.end = __pa_symbol(_edata) - 1;
113 data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
114
115 bss_res.start = __pa_symbol(__bss_start);
116 bss_res.end = __pa_symbol(__bss_stop) - 1;
117 bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
118
119 kimage_res.start = code_res.start;
120 kimage_res.end = bss_res.end;
121 kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
122
123 ret = add_resource(&iomem_resource, &kimage_res);
124 if (ret < 0)
125 return ret;
126
127 ret = add_resource(&kimage_res, &code_res);
128 if (ret < 0)
129 return ret;
130
131 ret = add_resource(&kimage_res, &rodata_res);
132 if (ret < 0)
133 return ret;
134
135 ret = add_resource(&kimage_res, &data_res);
136 if (ret < 0)
137 return ret;
138
139 ret = add_resource(&kimage_res, &bss_res);
140
141 return ret;
142}
143
144static void __init init_resources(void)
145{
146 struct memblock_region *region = NULL;
147 struct resource *res = NULL;
148 struct resource *mem_res = NULL;
149 size_t mem_res_sz = 0;
150 int num_resources = 0, res_idx = 0;
151 int ret = 0;
152
153
154 num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
155 res_idx = num_resources - 1;
156
157 mem_res_sz = num_resources * sizeof(*mem_res);
158 mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES);
159 if (!mem_res)
160 panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz);
161
162
163
164
165
166
167 ret = add_kernel_resources();
168 if (ret < 0)
169 goto error;
170
171#ifdef CONFIG_KEXEC_CORE
172 if (crashk_res.start != crashk_res.end) {
173 ret = add_resource(&iomem_resource, &crashk_res);
174 if (ret < 0)
175 goto error;
176 }
177#endif
178
179#ifdef CONFIG_CRASH_DUMP
180 if (elfcorehdr_size > 0) {
181 elfcorehdr_res.start = elfcorehdr_addr;
182 elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1;
183 elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
184 add_resource(&iomem_resource, &elfcorehdr_res);
185 }
186#endif
187
188 for_each_reserved_mem_region(region) {
189 res = &mem_res[res_idx--];
190
191 res->name = "Reserved";
192 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
193 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
194 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
195
196
197
198
199
200 if (memblock_is_memory(res->start)) {
201
202 res_idx++;
203 continue;
204 }
205
206 ret = add_resource(&iomem_resource, res);
207 if (ret < 0)
208 goto error;
209 }
210
211
212 for_each_mem_region(region) {
213 res = &mem_res[res_idx--];
214
215 if (unlikely(memblock_is_nomap(region))) {
216 res->name = "Reserved";
217 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
218 } else {
219 res->name = "System RAM";
220 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
221 }
222
223 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
224 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
225
226 ret = add_resource(&iomem_resource, res);
227 if (ret < 0)
228 goto error;
229 }
230
231
232 if (res_idx >= 0)
233 memblock_free(__pa(mem_res), (res_idx + 1) * sizeof(*mem_res));
234 return;
235
236 error:
237
238 release_child_resources(&iomem_resource);
239 memblock_free(__pa(mem_res), mem_res_sz);
240}
241
242
243static void __init parse_dtb(void)
244{
245
246 if (early_init_dt_scan(dtb_early_va)) {
247 const char *name = of_flat_dt_get_machine_name();
248
249 if (name) {
250 pr_info("Machine model: %s\n", name);
251 dump_stack_set_arch_desc("%s (DT)", name);
252 }
253 return;
254 }
255
256 pr_err("No DTB passed to the kernel\n");
257#ifdef CONFIG_CMDLINE_FORCE
258 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
259 pr_info("Forcing kernel command line to: %s\n", boot_command_line);
260#endif
261}
262
263void __init setup_arch(char **cmdline_p)
264{
265 parse_dtb();
266 setup_initial_init_mm(_stext, _etext, _edata, _end);
267
268 *cmdline_p = boot_command_line;
269
270 early_ioremap_setup();
271 jump_label_init();
272 parse_early_param();
273
274 efi_init();
275 paging_init();
276#if IS_ENABLED(CONFIG_BUILTIN_DTB)
277 unflatten_and_copy_device_tree();
278#else
279 if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
280 unflatten_device_tree();
281 else
282 pr_err("No DTB found in kernel mappings\n");
283#endif
284 misc_mem_init();
285
286 init_resources();
287 sbi_init();
288
289#ifdef CONFIG_KASAN
290 kasan_init();
291#endif
292
293#ifdef CONFIG_SMP
294 setup_smp();
295#endif
296
297 riscv_fill_hwcap();
298}
299
300static int __init topology_init(void)
301{
302 int i, ret;
303
304 for_each_online_node(i)
305 register_one_node(i);
306
307 for_each_possible_cpu(i) {
308 struct cpu *cpu = &per_cpu(cpu_devices, i);
309
310 cpu->hotpluggable = cpu_has_hotplug(i);
311 ret = register_cpu(cpu, i);
312 if (unlikely(ret))
313 pr_warn("Warning: %s: register_cpu %d failed (%d)\n",
314 __func__, i, ret);
315 }
316
317 return 0;
318}
319subsys_initcall(topology_init);
320
321void free_initmem(void)
322{
323 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
324 set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end),
325 IS_ENABLED(CONFIG_64BIT) ?
326 set_memory_rw : set_memory_rw_nx);
327
328 free_initmem_default(POISON_FREE_INITMEM);
329}
330
