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