arch/loongarch/kernel/setup.c

   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 #endif
 261
 262 #ifdef CONFIG_NUMA
 263         init_numa_memory();
 264 #endif
 265         dmi_setup();
 266         smbios_parse();
 267         pr_info("The BIOS Version: %s\n", b_info.bios_version);
 268
 269         efi_runtime_init();
 270 }
 271
 272 static void __init check_kernel_sections_mem(void)
 273 {
 274         phys_addr_t start = __pa_symbol(&_text);
 275         phys_addr_t size = __pa_symbol(&_end) - start;
 276
 277         if (!memblock_is_region_memory(start, size)) {
 278                 pr_info("Kernel sections are not in the memory maps\n");
 279                 memblock_add(start, size);
 280         }
 281 }
 282
 283 /*
 284  * arch_mem_init - initialize memory management subsystem
 285  */
 286 static void __init arch_mem_init(char **cmdline_p)
 287 {
 288         if (usermem)
 289                 pr_info("User-defined physical RAM map overwrite\n");
 290
 291         check_kernel_sections_mem();
 292
 293         /*
 294          * In order to reduce the possibility of kernel panic when failed to
 295          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 296          * low memory as small as possible before plat_swiotlb_setup(), so
 297          * make sparse_init() using top-down allocation.
 298          */
 299         memblock_set_bottom_up(false);
 300         sparse_init();
 301         memblock_set_bottom_up(true);
 302
 303         swiotlb_init(true, SWIOTLB_VERBOSE);
 304
 305         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 306
 307         memblock_dump_all();
 308
 309         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 310 }
 311
 312 static void __init resource_init(void)
 313 {
 314         long i = 0;
 315         size_t res_size;
 316         struct resource *res;
 317         struct memblock_region *region;
 318
 319         code_resource.start = __pa_symbol(&_text);
 320         code_resource.end = __pa_symbol(&_etext) - 1;
 321         data_resource.start = __pa_symbol(&_etext);
 322         data_resource.end = __pa_symbol(&_edata) - 1;
 323         bss_resource.start = __pa_symbol(&__bss_start);
 324         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 325
 326         num_standard_resources = memblock.memory.cnt;
 327         res_size = num_standard_resources * sizeof(*standard_resources);
 328         standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
 329
 330         for_each_mem_region(region) {
 331                 res = &standard_resources[i++];
 332                 if (!memblock_is_nomap(region)) {
 333                         res->name  = "System RAM";
 334                         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 335                         res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 336                         res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 337                 } else {
 338                         res->name  = "Reserved";
 339                         res->flags = IORESOURCE_MEM;
 340                         res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
 341                         res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
 342                 }
 343
 344                 request_resource(&iomem_resource, res);
 345
 346                 /*
 347                  *  We don't know which RAM region contains kernel data,
 348                  *  so we try it repeatedly and let the resource manager
 349                  *  test it.
 350                  */
 351                 request_resource(res, &code_resource);
 352                 request_resource(res, &data_resource);
 353                 request_resource(res, &bss_resource);
 354         }
 355
 356 #ifdef CONFIG_KEXEC
 357         if (crashk_res.start < crashk_res.end) {
 358                 insert_resource(&iomem_resource, &crashk_res);
 359                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 360                         (unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20),
 361                         (unsigned long)(crashk_res.start  >> 20));
 362         }
 363 #endif
 364 }
 365
 366 static int __init reserve_memblock_reserved_regions(void)
 367 {
 368         u64 i, j;
 369
 370         for (i = 0; i < num_standard_resources; ++i) {
 371                 struct resource *mem = &standard_resources[i];
 372                 phys_addr_t r_start, r_end, mem_size = resource_size(mem);
 373
 374                 if (!memblock_is_region_reserved(mem->start, mem_size))
 375                         continue;
 376
 377                 for_each_reserved_mem_range(j, &r_start, &r_end) {
 378                         resource_size_t start, end;
 379
 380                         start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
 381                         end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
 382
 383                         if (start > mem->end || end < mem->start)
 384                                 continue;
 385
 386                         reserve_region_with_split(mem, start, end, "Reserved");
 387                 }
 388         }
 389
 390         return 0;
 391 }
 392 arch_initcall(reserve_memblock_reserved_regions);
 393
 394 #ifdef CONFIG_SMP
 395 static void __init prefill_possible_map(void)
 396 {
 397         int i, possible;
 398
 399         possible = num_processors + disabled_cpus;
 400         if (possible > nr_cpu_ids)
 401                 possible = nr_cpu_ids;
 402
 403         pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 404                         possible, max((possible - num_processors), 0));
 405
 406         for (i = 0; i < possible; i++)
 407                 set_cpu_possible(i, true);
 408         for (; i < NR_CPUS; i++)
 409                 set_cpu_possible(i, false);
 410
 411         set_nr_cpu_ids(possible);
 412 }
 413 #endif
 414
 415 void __init setup_arch(char **cmdline_p)
 416 {
 417         cpu_probe();
 418         *cmdline_p = boot_command_line;
 419
 420         init_environ();
 421         efi_init();
 422         memblock_init();
 423         pagetable_init();
 424         parse_early_param();
 425         reserve_initrd_mem();
 426
 427         platform_init();
 428         arch_mem_init(cmdline_p);
 429
 430         resource_init();
 431 #ifdef CONFIG_SMP
 432         plat_smp_setup();
 433         prefill_possible_map();
 434 #endif
 435
 436         paging_init();
 437 }