1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 * 5 * Derived from MIPS: 6 * Copyright (C) 1995 Linus Torvalds 7 * Copyright (C) 1995 Waldorf Electronics 8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle 9 * Copyright (C) 1996 Stoned Elipot 10 * Copyright (C) 1999 Silicon Graphics, Inc. 11 * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki 12 */ 13 #include <linux/init.h> 14 #include <linux/acpi.h> 15 #include <linux/dmi.h> 16 #include <linux/efi.h> 17 #include <linux/export.h> 18 #include <linux/screen_info.h> 19 #include <linux/memblock.h> 20 #include <linux/initrd.h> 21 #include <linux/ioport.h> 22 #include <linux/kexec.h> 23 #include <linux/crash_dump.h> 24 #include <linux/root_dev.h> 25 #include <linux/console.h> 26 #include <linux/pfn.h> 27 #include <linux/platform_device.h> 28 #include <linux/sizes.h> 29 #include <linux/device.h> 30 #include <linux/dma-map-ops.h> 31 #include <linux/swiotlb.h> 32 33 #include <asm/addrspace.h> 34 #include <asm/bootinfo.h> 35 #include <asm/cache.h> 36 #include <asm/cpu.h> 37 #include <asm/dma.h> 38 #include <asm/efi.h> 39 #include <asm/loongson.h> 40 #include <asm/numa.h> 41 #include <asm/pgalloc.h> 42 #include <asm/sections.h> 43 #include <asm/setup.h> 44 #include <asm/time.h> 45 46 #define SMBIOS_BIOSSIZE_OFFSET 0x09 47 #define SMBIOS_BIOSEXTERN_OFFSET 0x13 48 #define SMBIOS_FREQLOW_OFFSET 0x16 49 #define SMBIOS_FREQHIGH_OFFSET 0x17 50 #define SMBIOS_FREQLOW_MASK 0xFF 51 #define SMBIOS_CORE_PACKAGE_OFFSET 0x23 52 #define LOONGSON_EFI_ENABLE (1 << 3) 53 54 struct screen_info screen_info __section(".data"); 55 56 unsigned long fw_arg0, fw_arg1, fw_arg2; 57 DEFINE_PER_CPU(unsigned long, kernelsp); 58 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly; 59 60 EXPORT_SYMBOL(cpu_data); 61 62 struct loongson_board_info b_info; 63 static const char dmi_empty_string[] = " "; 64 65 /* 66 * Setup information 67 * 68 * These are initialized so they are in the .data section 69 */ 70 71 static int num_standard_resources; 72 static struct resource *standard_resources; 73 74 static struct resource code_resource = { .name = "Kernel code", }; 75 static struct resource data_resource = { .name = "Kernel data", }; 76 static struct resource bss_resource = { .name = "Kernel bss", }; 77 78 const char *get_system_type(void) 79 { 80 return "generic-loongson-machine"; 81 } 82 83 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s) 84 { 85 const u8 *bp = ((u8 *) dm) + dm->length; 86 87 if (s) { 88 s--; 89 while (s > 0 && *bp) { 90 bp += strlen(bp) + 1; 91 s--; 92 } 93 94 if (*bp != 0) { 95 size_t len = strlen(bp)+1; 96 size_t cmp_len = len > 8 ? 8 : len; 97 98 if (!memcmp(bp, dmi_empty_string, cmp_len)) 99 return dmi_empty_string; 100 101 return bp; 102 } 103 } 104 105 return ""; 106 } 107 108 static void __init parse_cpu_table(const struct dmi_header *dm) 109 { 110 long freq_temp = 0; 111 char *dmi_data = (char *)dm; 112 113 freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) + 114 ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK)); 115 cpu_clock_freq = freq_temp * 1000000; 116 117 loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]); 118 loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET); 119 120 pr_info("CpuClock = %llu\n", cpu_clock_freq); 121 } 122 123 static void __init parse_bios_table(const struct dmi_header *dm) 124 { 125 char *dmi_data = (char *)dm; 126 127 b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6; 128 } 129 130 static void __init find_tokens(const struct dmi_header *dm, void *dummy) 131 { 132 switch (dm->type) { 133 case 0x0: /* Extern BIOS */ 134 parse_bios_table(dm); 135 break; 136 case 0x4: /* Calling interface */ 137 parse_cpu_table(dm); 138 break; 139 } 140 } 141 static void __init smbios_parse(void) 142 { 143 b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR); 144 b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION); 145 b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE); 146 b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR); 147 b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME); 148 dmi_walk(find_tokens, NULL); 149 } 150 151 static int usermem __initdata; 152 153 static int __init early_parse_mem(char *p) 154 { 155 phys_addr_t start, size; 156 157 if (!p) { 158 pr_err("mem parameter is empty, do nothing\n"); 159 return -EINVAL; 160 } 161 162 /* 163 * If a user specifies memory size, we 164 * blow away any automatically generated 165 * size. 166 */ 167 if (usermem == 0) { 168 usermem = 1; 169 memblock_remove(memblock_start_of_DRAM(), 170 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 171 } 172 start = 0; 173 size = memparse(p, &p); 174 if (*p == '@') 175 start = memparse(p + 1, &p); 176 else { 177 pr_err("Invalid format!\n"); 178 return -EINVAL; 179 } 180 181 if (!IS_ENABLED(CONFIG_NUMA)) 182 memblock_add(start, size); 183 else 184 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 185 186 return 0; 187 } 188 early_param("mem", early_parse_mem); 189 190 static void __init arch_reserve_vmcore(void) 191 { 192 #ifdef CONFIG_PROC_VMCORE 193 u64 i; 194 phys_addr_t start, end; 195 196 if (!is_kdump_kernel()) 197 return; 198 199 if (!elfcorehdr_size) { 200 for_each_mem_range(i, &start, &end) { 201 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) { 202 /* 203 * Reserve from the elf core header to the end of 204 * the memory segment, that should all be kdump 205 * reserved memory. 206 */ 207 elfcorehdr_size = end - elfcorehdr_addr; 208 break; 209 } 210 } 211 } 212 213 if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) { 214 pr_warn("elfcorehdr is overlapped\n"); 215 return; 216 } 217 218 memblock_reserve(elfcorehdr_addr, elfcorehdr_size); 219 220 pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n", 221 elfcorehdr_size >> 10, elfcorehdr_addr); 222 #endif 223 } 224 225 static void __init arch_parse_crashkernel(void) 226 { 227 #ifdef CONFIG_KEXEC 228 int ret; 229 unsigned long long start; 230 unsigned long long total_mem; 231 unsigned long long crash_base, crash_size; 232 233 total_mem = memblock_phys_mem_size(); 234 ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base); 235 if (ret < 0 || crash_size <= 0) 236 return; 237 238 start = memblock_phys_alloc_range(crash_size, 1, crash_base, crash_base + crash_size); 239 if (start != crash_base) { 240 pr_warn("Invalid memory region reserved for crash kernel\n"); 241 return; 242 } 243 244 crashk_res.start = crash_base; 245 crashk_res.end = crash_base + crash_size - 1; 246 #endif 247 } 248 249 void __init platform_init(void) 250 { 251 arch_reserve_vmcore(); 252 arch_parse_crashkernel(); 253 254 #ifdef CONFIG_ACPI_TABLE_UPGRADE 255 acpi_table_upgrade(); 256 #endif 257 #ifdef CONFIG_ACPI 258 acpi_gbl_use_default_register_widths = false; 259 acpi_boot_table_init(); 260 acpi_boot_init(); 261 #endif 262 263 #ifdef CONFIG_NUMA 264 init_numa_memory(); 265 #endif 266 dmi_setup(); 267 smbios_parse(); 268 pr_info("The BIOS Version: %s\n", b_info.bios_version); 269 270 efi_runtime_init(); 271 } 272 273 static void __init check_kernel_sections_mem(void) 274 { 275 phys_addr_t start = __pa_symbol(&_text); 276 phys_addr_t size = __pa_symbol(&_end) - start; 277 278 if (!memblock_is_region_memory(start, size)) { 279 pr_info("Kernel sections are not in the memory maps\n"); 280 memblock_add(start, size); 281 } 282 } 283 284 /* 285 * arch_mem_init - initialize memory management subsystem 286 */ 287 static void __init arch_mem_init(char **cmdline_p) 288 { 289 if (usermem) 290 pr_info("User-defined physical RAM map overwrite\n"); 291 292 check_kernel_sections_mem(); 293 294 /* 295 * In order to reduce the possibility of kernel panic when failed to 296 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 297 * low memory as small as possible before plat_swiotlb_setup(), so 298 * make sparse_init() using top-down allocation. 299 */ 300 memblock_set_bottom_up(false); 301 sparse_init(); 302 memblock_set_bottom_up(true); 303 304 swiotlb_init(true, SWIOTLB_VERBOSE); 305 306 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 307 308 memblock_dump_all(); 309 310 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 311 } 312 313 static void __init resource_init(void) 314 { 315 long i = 0; 316 size_t res_size; 317 struct resource *res; 318 struct memblock_region *region; 319 320 code_resource.start = __pa_symbol(&_text); 321 code_resource.end = __pa_symbol(&_etext) - 1; 322 data_resource.start = __pa_symbol(&_etext); 323 data_resource.end = __pa_symbol(&_edata) - 1; 324 bss_resource.start = __pa_symbol(&__bss_start); 325 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 326 327 num_standard_resources = memblock.memory.cnt; 328 res_size = num_standard_resources * sizeof(*standard_resources); 329 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES); 330 331 for_each_mem_region(region) { 332 res = &standard_resources[i++]; 333 if (!memblock_is_nomap(region)) { 334 res->name = "System RAM"; 335 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 336 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 337 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 338 } else { 339 res->name = "Reserved"; 340 res->flags = IORESOURCE_MEM; 341 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); 342 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; 343 } 344 345 request_resource(&iomem_resource, res); 346 347 /* 348 * We don't know which RAM region contains kernel data, 349 * so we try it repeatedly and let the resource manager 350 * test it. 351 */ 352 request_resource(res, &code_resource); 353 request_resource(res, &data_resource); 354 request_resource(res, &bss_resource); 355 } 356 357 #ifdef CONFIG_KEXEC 358 if (crashk_res.start < crashk_res.end) { 359 insert_resource(&iomem_resource, &crashk_res); 360 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 361 (unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20), 362 (unsigned long)(crashk_res.start >> 20)); 363 } 364 #endif 365 } 366 367 static int __init reserve_memblock_reserved_regions(void) 368 { 369 u64 i, j; 370 371 for (i = 0; i < num_standard_resources; ++i) { 372 struct resource *mem = &standard_resources[i]; 373 phys_addr_t r_start, r_end, mem_size = resource_size(mem); 374 375 if (!memblock_is_region_reserved(mem->start, mem_size)) 376 continue; 377 378 for_each_reserved_mem_range(j, &r_start, &r_end) { 379 resource_size_t start, end; 380 381 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); 382 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end); 383 384 if (start > mem->end || end < mem->start) 385 continue; 386 387 reserve_region_with_split(mem, start, end, "Reserved"); 388 } 389 } 390 391 return 0; 392 } 393 arch_initcall(reserve_memblock_reserved_regions); 394 395 #ifdef CONFIG_SMP 396 static void __init prefill_possible_map(void) 397 { 398 int i, possible; 399 400 possible = num_processors + disabled_cpus; 401 if (possible > nr_cpu_ids) 402 possible = nr_cpu_ids; 403 404 pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n", 405 possible, max((possible - num_processors), 0)); 406 407 for (i = 0; i < possible; i++) 408 set_cpu_possible(i, true); 409 for (; i < NR_CPUS; i++) 410 set_cpu_possible(i, false); 411 412 set_nr_cpu_ids(possible); 413 } 414 #endif 415 416 void __init setup_arch(char **cmdline_p) 417 { 418 cpu_probe(); 419 *cmdline_p = boot_command_line; 420 421 init_environ(); 422 efi_init(); 423 memblock_init(); 424 pagetable_init(); 425 parse_early_param(); 426 reserve_initrd_mem(); 427 428 platform_init(); 429 arch_mem_init(cmdline_p); 430 431 resource_init(); 432 #ifdef CONFIG_SMP 433 plat_smp_setup(); 434 prefill_possible_map(); 435 #endif 436 437 paging_init(); 438 } 439