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