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 25 #include <asm/acpi.h> 26 #include <asm/alternative.h> 27 #include <asm/cacheflush.h> 28 #include <asm/cpu_ops.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 #if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI) 43 struct screen_info screen_info __section(".data") = { 44 .orig_video_lines = 30, 45 .orig_video_cols = 80, 46 .orig_video_mode = 0, 47 .orig_video_ega_bx = 0, 48 .orig_video_isVGA = 1, 49 .orig_video_points = 8 50 }; 51 #endif 52 53 /* 54 * The lucky hart to first increment this variable will boot the other cores. 55 * This is used before the kernel initializes the BSS so it can't be in the 56 * BSS. 57 */ 58 atomic_t hart_lottery __section(".sdata") 59 #ifdef CONFIG_XIP_KERNEL 60 = ATOMIC_INIT(0xC001BEEF) 61 #endif 62 ; 63 unsigned long boot_cpu_hartid; 64 static DEFINE_PER_CPU(struct cpu, cpu_devices); 65 66 /* 67 * Place kernel memory regions on the resource tree so that 68 * kexec-tools can retrieve them from /proc/iomem. While there 69 * also add "System RAM" regions for compatibility with other 70 * archs, and the rest of the known regions for completeness. 71 */ 72 static struct resource kimage_res = { .name = "Kernel image", }; 73 static struct resource code_res = { .name = "Kernel code", }; 74 static struct resource data_res = { .name = "Kernel data", }; 75 static struct resource rodata_res = { .name = "Kernel rodata", }; 76 static struct resource bss_res = { .name = "Kernel bss", }; 77 #ifdef CONFIG_CRASH_DUMP 78 static struct resource elfcorehdr_res = { .name = "ELF Core hdr", }; 79 #endif 80 81 static int __init add_resource(struct resource *parent, 82 struct resource *res) 83 { 84 int ret = 0; 85 86 ret = insert_resource(parent, res); 87 if (ret < 0) { 88 pr_err("Failed to add a %s resource at %llx\n", 89 res->name, (unsigned long long) res->start); 90 return ret; 91 } 92 93 return 1; 94 } 95 96 static int __init add_kernel_resources(void) 97 { 98 int ret = 0; 99 100 /* 101 * The memory region of the kernel image is continuous and 102 * was reserved on setup_bootmem, register it here as a 103 * resource, with the various segments of the image as 104 * child nodes. 105 */ 106 107 code_res.start = __pa_symbol(_text); 108 code_res.end = __pa_symbol(_etext) - 1; 109 code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 110 111 rodata_res.start = __pa_symbol(__start_rodata); 112 rodata_res.end = __pa_symbol(__end_rodata) - 1; 113 rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 114 115 data_res.start = __pa_symbol(_data); 116 data_res.end = __pa_symbol(_edata) - 1; 117 data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 118 119 bss_res.start = __pa_symbol(__bss_start); 120 bss_res.end = __pa_symbol(__bss_stop) - 1; 121 bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 122 123 kimage_res.start = code_res.start; 124 kimage_res.end = bss_res.end; 125 kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 126 127 ret = add_resource(&iomem_resource, &kimage_res); 128 if (ret < 0) 129 return ret; 130 131 ret = add_resource(&kimage_res, &code_res); 132 if (ret < 0) 133 return ret; 134 135 ret = add_resource(&kimage_res, &rodata_res); 136 if (ret < 0) 137 return ret; 138 139 ret = add_resource(&kimage_res, &data_res); 140 if (ret < 0) 141 return ret; 142 143 ret = add_resource(&kimage_res, &bss_res); 144 145 return ret; 146 } 147 148 static void __init init_resources(void) 149 { 150 struct memblock_region *region = NULL; 151 struct resource *res = NULL; 152 struct resource *mem_res = NULL; 153 size_t mem_res_sz = 0; 154 int num_resources = 0, res_idx = 0; 155 int ret = 0; 156 157 /* + 1 as memblock_alloc() might increase memblock.reserved.cnt */ 158 num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1; 159 res_idx = num_resources - 1; 160 161 mem_res_sz = num_resources * sizeof(*mem_res); 162 mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES); 163 if (!mem_res) 164 panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz); 165 166 /* 167 * Start by adding the reserved regions, if they overlap 168 * with /memory regions, insert_resource later on will take 169 * care of it. 170 */ 171 ret = add_kernel_resources(); 172 if (ret < 0) 173 goto error; 174 175 #ifdef CONFIG_KEXEC_CORE 176 if (crashk_res.start != crashk_res.end) { 177 ret = add_resource(&iomem_resource, &crashk_res); 178 if (ret < 0) 179 goto error; 180 } 181 #endif 182 183 #ifdef CONFIG_CRASH_DUMP 184 if (elfcorehdr_size > 0) { 185 elfcorehdr_res.start = elfcorehdr_addr; 186 elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1; 187 elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 188 add_resource(&iomem_resource, &elfcorehdr_res); 189 } 190 #endif 191 192 for_each_reserved_mem_region(region) { 193 res = &mem_res[res_idx--]; 194 195 res->name = "Reserved"; 196 res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE; 197 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); 198 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; 199 200 /* 201 * Ignore any other reserved regions within 202 * system memory. 203 */ 204 if (memblock_is_memory(res->start)) { 205 /* Re-use this pre-allocated resource */ 206 res_idx++; 207 continue; 208 } 209 210 ret = add_resource(&iomem_resource, res); 211 if (ret < 0) 212 goto error; 213 } 214 215 /* Add /memory regions to the resource tree */ 216 for_each_mem_region(region) { 217 res = &mem_res[res_idx--]; 218 219 if (unlikely(memblock_is_nomap(region))) { 220 res->name = "Reserved"; 221 res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE; 222 } else { 223 res->name = "System RAM"; 224 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 225 } 226 227 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 228 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 229 230 ret = add_resource(&iomem_resource, res); 231 if (ret < 0) 232 goto error; 233 } 234 235 /* Clean-up any unused pre-allocated resources */ 236 if (res_idx >= 0) 237 memblock_free(mem_res, (res_idx + 1) * sizeof(*mem_res)); 238 return; 239 240 error: 241 /* Better an empty resource tree than an inconsistent one */ 242 release_child_resources(&iomem_resource); 243 memblock_free(mem_res, mem_res_sz); 244 } 245 246 247 static void __init parse_dtb(void) 248 { 249 /* Early scan of device tree from init memory */ 250 if (early_init_dt_scan(dtb_early_va)) { 251 const char *name = of_flat_dt_get_machine_name(); 252 253 if (name) { 254 pr_info("Machine model: %s\n", name); 255 dump_stack_set_arch_desc("%s (DT)", name); 256 } 257 } else { 258 pr_err("No DTB passed to the kernel\n"); 259 } 260 261 #ifdef CONFIG_CMDLINE_FORCE 262 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 263 pr_info("Forcing kernel command line to: %s\n", boot_command_line); 264 #endif 265 } 266 267 extern void __init init_rt_signal_env(void); 268 269 void __init setup_arch(char **cmdline_p) 270 { 271 parse_dtb(); 272 setup_initial_init_mm(_stext, _etext, _edata, _end); 273 274 *cmdline_p = boot_command_line; 275 276 early_ioremap_setup(); 277 sbi_init(); 278 jump_label_init(); 279 parse_early_param(); 280 281 efi_init(); 282 paging_init(); 283 284 /* Parse the ACPI tables for possible boot-time configuration */ 285 acpi_boot_table_init(); 286 287 #if IS_ENABLED(CONFIG_BUILTIN_DTB) 288 unflatten_and_copy_device_tree(); 289 #else 290 unflatten_device_tree(); 291 #endif 292 misc_mem_init(); 293 294 init_resources(); 295 296 #ifdef CONFIG_KASAN 297 kasan_init(); 298 #endif 299 300 #ifdef CONFIG_SMP 301 setup_smp(); 302 #endif 303 304 if (!acpi_disabled) 305 acpi_init_rintc_map(); 306 307 riscv_init_cbo_blocksizes(); 308 riscv_fill_hwcap(); 309 init_rt_signal_env(); 310 apply_boot_alternatives(); 311 if (IS_ENABLED(CONFIG_RISCV_ISA_ZICBOM) && 312 riscv_isa_extension_available(NULL, ZICBOM)) 313 riscv_noncoherent_supported(); 314 } 315 316 static int __init topology_init(void) 317 { 318 int i, ret; 319 320 for_each_possible_cpu(i) { 321 struct cpu *cpu = &per_cpu(cpu_devices, i); 322 323 cpu->hotpluggable = cpu_has_hotplug(i); 324 ret = register_cpu(cpu, i); 325 if (unlikely(ret)) 326 pr_warn("Warning: %s: register_cpu %d failed (%d)\n", 327 __func__, i, ret); 328 } 329 330 return 0; 331 } 332 subsys_initcall(topology_init); 333 334 void free_initmem(void) 335 { 336 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) { 337 set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end), set_memory_rw_nx); 338 if (IS_ENABLED(CONFIG_64BIT)) 339 set_kernel_memory(__init_begin, __init_end, set_memory_nx); 340 } 341 342 free_initmem_default(POISON_FREE_INITMEM); 343 } 344