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 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 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 } 135 136 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 } 225 226 227 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, __pa(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); 248 249 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 } 301 302 bool arch_cpu_is_hotpluggable(int cpu) 303 { 304 return cpu_has_hotplug(cpu); 305 } 306 307 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 } 317 318 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 }; 331 332 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