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/root_dev.h> 23 #include <linux/console.h> 24 #include <linux/pfn.h> 25 #include <linux/platform_device.h> 26 #include <linux/sizes.h> 27 #include <linux/device.h> 28 #include <linux/dma-map-ops.h> 29 #include <linux/swiotlb.h> 30 31 #include <asm/addrspace.h> 32 #include <asm/bootinfo.h> 33 #include <asm/cache.h> 34 #include <asm/cpu.h> 35 #include <asm/dma.h> 36 #include <asm/efi.h> 37 #include <asm/loongson.h> 38 #include <asm/numa.h> 39 #include <asm/pgalloc.h> 40 #include <asm/sections.h> 41 #include <asm/setup.h> 42 #include <asm/smp.h> 43 #include <asm/time.h> 44 45 #define SMBIOS_BIOSSIZE_OFFSET 0x09 46 #define SMBIOS_BIOSEXTERN_OFFSET 0x13 47 #define SMBIOS_FREQLOW_OFFSET 0x16 48 #define SMBIOS_FREQHIGH_OFFSET 0x17 49 #define SMBIOS_FREQLOW_MASK 0xFF 50 #define SMBIOS_CORE_PACKAGE_OFFSET 0x23 51 #define LOONGSON_EFI_ENABLE (1 << 3) 52 53 #ifdef CONFIG_VT 54 struct screen_info screen_info; 55 #endif 56 57 unsigned long fw_arg0, fw_arg1; 58 DEFINE_PER_CPU(unsigned long, kernelsp); 59 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly; 60 61 EXPORT_SYMBOL(cpu_data); 62 63 struct loongson_board_info b_info; 64 static const char dmi_empty_string[] = " "; 65 66 /* 67 * Setup information 68 * 69 * These are initialized so they are in the .data section 70 */ 71 72 static int num_standard_resources; 73 static struct resource *standard_resources; 74 75 static struct resource code_resource = { .name = "Kernel code", }; 76 static struct resource data_resource = { .name = "Kernel data", }; 77 static struct resource bss_resource = { .name = "Kernel bss", }; 78 79 const char *get_system_type(void) 80 { 81 return "generic-loongson-machine"; 82 } 83 84 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s) 85 { 86 const u8 *bp = ((u8 *) dm) + dm->length; 87 88 if (s) { 89 s--; 90 while (s > 0 && *bp) { 91 bp += strlen(bp) + 1; 92 s--; 93 } 94 95 if (*bp != 0) { 96 size_t len = strlen(bp)+1; 97 size_t cmp_len = len > 8 ? 8 : len; 98 99 if (!memcmp(bp, dmi_empty_string, cmp_len)) 100 return dmi_empty_string; 101 102 return bp; 103 } 104 } 105 106 return ""; 107 } 108 109 static void __init parse_cpu_table(const struct dmi_header *dm) 110 { 111 long freq_temp = 0; 112 char *dmi_data = (char *)dm; 113 114 freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) + 115 ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK)); 116 cpu_clock_freq = freq_temp * 1000000; 117 118 loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]); 119 loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET); 120 121 pr_info("CpuClock = %llu\n", cpu_clock_freq); 122 } 123 124 static void __init parse_bios_table(const struct dmi_header *dm) 125 { 126 int bios_extern; 127 char *dmi_data = (char *)dm; 128 129 bios_extern = *(dmi_data + SMBIOS_BIOSEXTERN_OFFSET); 130 b_info.bios_size = *(dmi_data + SMBIOS_BIOSSIZE_OFFSET); 131 132 if (bios_extern & LOONGSON_EFI_ENABLE) 133 set_bit(EFI_BOOT, &efi.flags); 134 else 135 clear_bit(EFI_BOOT, &efi.flags); 136 } 137 138 static void __init find_tokens(const struct dmi_header *dm, void *dummy) 139 { 140 switch (dm->type) { 141 case 0x0: /* Extern BIOS */ 142 parse_bios_table(dm); 143 break; 144 case 0x4: /* Calling interface */ 145 parse_cpu_table(dm); 146 break; 147 } 148 } 149 static void __init smbios_parse(void) 150 { 151 b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR); 152 b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION); 153 b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE); 154 b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR); 155 b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME); 156 dmi_walk(find_tokens, NULL); 157 } 158 159 static int usermem __initdata; 160 161 static int __init early_parse_mem(char *p) 162 { 163 phys_addr_t start, size; 164 165 if (!p) { 166 pr_err("mem parameter is empty, do nothing\n"); 167 return -EINVAL; 168 } 169 170 /* 171 * If a user specifies memory size, we 172 * blow away any automatically generated 173 * size. 174 */ 175 if (usermem == 0) { 176 usermem = 1; 177 memblock_remove(memblock_start_of_DRAM(), 178 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 179 } 180 start = 0; 181 size = memparse(p, &p); 182 if (*p == '@') 183 start = memparse(p + 1, &p); 184 else { 185 pr_err("Invalid format!\n"); 186 return -EINVAL; 187 } 188 189 if (!IS_ENABLED(CONFIG_NUMA)) 190 memblock_add(start, size); 191 else 192 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 193 194 return 0; 195 } 196 early_param("mem", early_parse_mem); 197 198 void __init platform_init(void) 199 { 200 efi_init(); 201 #ifdef CONFIG_ACPI_TABLE_UPGRADE 202 acpi_table_upgrade(); 203 #endif 204 #ifdef CONFIG_ACPI 205 acpi_gbl_use_default_register_widths = false; 206 acpi_boot_table_init(); 207 acpi_boot_init(); 208 #endif 209 210 #ifdef CONFIG_NUMA 211 init_numa_memory(); 212 #endif 213 dmi_setup(); 214 smbios_parse(); 215 pr_info("The BIOS Version: %s\n", b_info.bios_version); 216 217 efi_runtime_init(); 218 } 219 220 static void __init check_kernel_sections_mem(void) 221 { 222 phys_addr_t start = __pa_symbol(&_text); 223 phys_addr_t size = __pa_symbol(&_end) - start; 224 225 if (!memblock_is_region_memory(start, size)) { 226 pr_info("Kernel sections are not in the memory maps\n"); 227 memblock_add(start, size); 228 } 229 } 230 231 /* 232 * arch_mem_init - initialize memory management subsystem 233 */ 234 static void __init arch_mem_init(char **cmdline_p) 235 { 236 if (usermem) 237 pr_info("User-defined physical RAM map overwrite\n"); 238 239 check_kernel_sections_mem(); 240 241 /* 242 * In order to reduce the possibility of kernel panic when failed to 243 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 244 * low memory as small as possible before plat_swiotlb_setup(), so 245 * make sparse_init() using top-down allocation. 246 */ 247 memblock_set_bottom_up(false); 248 sparse_init(); 249 memblock_set_bottom_up(true); 250 251 plat_swiotlb_setup(); 252 253 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 254 255 memblock_dump_all(); 256 257 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 258 } 259 260 static void __init resource_init(void) 261 { 262 long i = 0; 263 size_t res_size; 264 struct resource *res; 265 struct memblock_region *region; 266 267 code_resource.start = __pa_symbol(&_text); 268 code_resource.end = __pa_symbol(&_etext) - 1; 269 data_resource.start = __pa_symbol(&_etext); 270 data_resource.end = __pa_symbol(&_edata) - 1; 271 bss_resource.start = __pa_symbol(&__bss_start); 272 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 273 274 num_standard_resources = memblock.memory.cnt; 275 res_size = num_standard_resources * sizeof(*standard_resources); 276 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES); 277 278 for_each_mem_region(region) { 279 res = &standard_resources[i++]; 280 if (!memblock_is_nomap(region)) { 281 res->name = "System RAM"; 282 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 283 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 284 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 285 } else { 286 res->name = "Reserved"; 287 res->flags = IORESOURCE_MEM; 288 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); 289 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; 290 } 291 292 request_resource(&iomem_resource, res); 293 294 /* 295 * We don't know which RAM region contains kernel data, 296 * so we try it repeatedly and let the resource manager 297 * test it. 298 */ 299 request_resource(res, &code_resource); 300 request_resource(res, &data_resource); 301 request_resource(res, &bss_resource); 302 } 303 } 304 305 static int __init reserve_memblock_reserved_regions(void) 306 { 307 u64 i, j; 308 309 for (i = 0; i < num_standard_resources; ++i) { 310 struct resource *mem = &standard_resources[i]; 311 phys_addr_t r_start, r_end, mem_size = resource_size(mem); 312 313 if (!memblock_is_region_reserved(mem->start, mem_size)) 314 continue; 315 316 for_each_reserved_mem_range(j, &r_start, &r_end) { 317 resource_size_t start, end; 318 319 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); 320 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end); 321 322 if (start > mem->end || end < mem->start) 323 continue; 324 325 reserve_region_with_split(mem, start, end, "Reserved"); 326 } 327 } 328 329 return 0; 330 } 331 arch_initcall(reserve_memblock_reserved_regions); 332 333 #ifdef CONFIG_SMP 334 static void __init prefill_possible_map(void) 335 { 336 int i, possible; 337 338 possible = num_processors + disabled_cpus; 339 if (possible > nr_cpu_ids) 340 possible = nr_cpu_ids; 341 342 pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n", 343 possible, max((possible - num_processors), 0)); 344 345 for (i = 0; i < possible; i++) 346 set_cpu_possible(i, true); 347 for (; i < NR_CPUS; i++) 348 set_cpu_possible(i, false); 349 350 nr_cpu_ids = possible; 351 } 352 #else 353 static inline void prefill_possible_map(void) {} 354 #endif 355 356 void __init setup_arch(char **cmdline_p) 357 { 358 cpu_probe(); 359 *cmdline_p = boot_command_line; 360 361 init_environ(); 362 memblock_init(); 363 parse_early_param(); 364 365 platform_init(); 366 pagetable_init(); 367 arch_mem_init(cmdline_p); 368 369 resource_init(); 370 plat_smp_setup(); 371 prefill_possible_map(); 372 373 paging_init(); 374 } 375