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