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/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/time.h>
  43
  44 #define SMBIOS_BIOSSIZE_OFFSET          0x09
  45 #define SMBIOS_BIOSEXTERN_OFFSET        0x13
  46 #define SMBIOS_FREQLOW_OFFSET           0x16
  47 #define SMBIOS_FREQHIGH_OFFSET          0x17
  48 #define SMBIOS_FREQLOW_MASK             0xFF
  49 #define SMBIOS_CORE_PACKAGE_OFFSET      0x23
  50 #define LOONGSON_EFI_ENABLE             (1 << 3)
  51
  52 struct screen_info screen_info __section(".data");
  53
  54 unsigned long fw_arg0, fw_arg1, fw_arg2;
  55 DEFINE_PER_CPU(unsigned long, kernelsp);
  56 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
  57
  58 EXPORT_SYMBOL(cpu_data);
  59
  60 struct loongson_board_info b_info;
  61 static const char dmi_empty_string[] = "        ";
  62
  63 /*
  64  * Setup information
  65  *
  66  * These are initialized so they are in the .data section
  67  */
  68
  69 static int num_standard_resources;
  70 static struct resource *standard_resources;
  71
  72 static struct resource code_resource = { .name = "Kernel code", };
  73 static struct resource data_resource = { .name = "Kernel data", };
  74 static struct resource bss_resource  = { .name = "Kernel bss", };
  75
  76 const char *get_system_type(void)
  77 {
  78         return "generic-loongson-machine";
  79 }
  80
  81 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
  82 {
  83         const u8 *bp = ((u8 *) dm) + dm->length;
  84
  85         if (s) {
  86                 s--;
  87                 while (s > 0 && *bp) {
  88                         bp += strlen(bp) + 1;
  89                         s--;
  90                 }
  91
  92                 if (*bp != 0) {
  93                         size_t len = strlen(bp)+1;
  94                         size_t cmp_len = len > 8 ? 8 : len;
  95
  96                         if (!memcmp(bp, dmi_empty_string, cmp_len))
  97                                 return dmi_empty_string;
  98
  99                         return bp;
 100                 }
 101         }
 102
 103         return "";
 104 }
 105
 106 static void __init parse_cpu_table(const struct dmi_header *dm)
 107 {
 108         long freq_temp = 0;
 109         char *dmi_data = (char *)dm;
 110
 111         freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
 112                         ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
 113         cpu_clock_freq = freq_temp * 1000000;
 114
 115         loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
 116         loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
 117
 118         pr_info("CpuClock = %llu\n", cpu_clock_freq);
 119 }
 120
 121 static void __init parse_bios_table(const struct dmi_header *dm)
 122 {
 123         char *dmi_data = (char *)dm;
 124
 125         b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
 126 }
 127
 128 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 129 {
 130         switch (dm->type) {
 131         case 0x0: /* Extern BIOS */
 132                 parse_bios_table(dm);
 133                 break;
 134         case 0x4: /* Calling interface */
 135                 parse_cpu_table(dm);
 136                 break;
 137         }
 138 }
 139 static void __init smbios_parse(void)
 140 {
 141         b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
 142         b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
 143         b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
 144         b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
 145         b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
 146         dmi_walk(find_tokens, NULL);
 147 }
 148
 149 static int usermem __initdata;
 150
 151 static int __init early_parse_mem(char *p)
 152 {
 153         phys_addr_t start, size;
 154
 155         if (!p) {
 156                 pr_err("mem parameter is empty, do nothing\n");
 157                 return -EINVAL;
 158         }
 159
 160         /*
 161          * If a user specifies memory size, we
 162          * blow away any automatically generated
 163          * size.
 164          */
 165         if (usermem == 0) {
 166                 usermem = 1;
 167                 memblock_remove(memblock_start_of_DRAM(),
 168                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
 169         }
 170         start = 0;
 171         size = memparse(p, &p);
 172         if (*p == '@')
 173                 start = memparse(p + 1, &p);
 174         else {
 175                 pr_err("Invalid format!\n");
 176                 return -EINVAL;
 177         }
 178
 179         if (!IS_ENABLED(CONFIG_NUMA))
 180                 memblock_add(start, size);
 181         else
 182                 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
 183
 184         return 0;
 185 }
 186 early_param("mem", early_parse_mem);
 187
 188 void __init platform_init(void)
 189 {
 190 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 191         acpi_table_upgrade();
 192 #endif
 193 #ifdef CONFIG_ACPI
 194         acpi_gbl_use_default_register_widths = false;
 195         acpi_boot_table_init();
 196         acpi_boot_init();
 197 #endif
 198
 199 #ifdef CONFIG_NUMA
 200         init_numa_memory();
 201 #endif
 202         dmi_setup();
 203         smbios_parse();
 204         pr_info("The BIOS Version: %s\n", b_info.bios_version);
 205
 206         efi_runtime_init();
 207 }
 208
 209 static void __init check_kernel_sections_mem(void)
 210 {
 211         phys_addr_t start = __pa_symbol(&_text);
 212         phys_addr_t size = __pa_symbol(&_end) - start;
 213
 214         if (!memblock_is_region_memory(start, size)) {
 215                 pr_info("Kernel sections are not in the memory maps\n");
 216                 memblock_add(start, size);
 217         }
 218 }
 219
 220 /*
 221  * arch_mem_init - initialize memory management subsystem
 222  */
 223 static void __init arch_mem_init(char **cmdline_p)
 224 {
 225         if (usermem)
 226                 pr_info("User-defined physical RAM map overwrite\n");
 227
 228         check_kernel_sections_mem();
 229
 230         /*
 231          * In order to reduce the possibility of kernel panic when failed to
 232          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 233          * low memory as small as possible before plat_swiotlb_setup(), so
 234          * make sparse_init() using top-down allocation.
 235          */
 236         memblock_set_bottom_up(false);
 237         sparse_init();
 238         memblock_set_bottom_up(true);
 239
 240         swiotlb_init(true, SWIOTLB_VERBOSE);
 241
 242         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 243
 244         memblock_dump_all();
 245
 246         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 247 }
 248
 249 static void __init resource_init(void)
 250 {
 251         long i = 0;
 252         size_t res_size;
 253         struct resource *res;
 254         struct memblock_region *region;
 255
 256         code_resource.start = __pa_symbol(&_text);
 257         code_resource.end = __pa_symbol(&_etext) - 1;
 258         data_resource.start = __pa_symbol(&_etext);
 259         data_resource.end = __pa_symbol(&_edata) - 1;
 260         bss_resource.start = __pa_symbol(&__bss_start);
 261         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 262
 263         num_standard_resources = memblock.memory.cnt;
 264         res_size = num_standard_resources * sizeof(*standard_resources);
 265         standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
 266
 267         for_each_mem_region(region) {
 268                 res = &standard_resources[i++];
 269                 if (!memblock_is_nomap(region)) {
 270                         res->name  = "System RAM";
 271                         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 272                         res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 273                         res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 274                 } else {
 275                         res->name  = "Reserved";
 276                         res->flags = IORESOURCE_MEM;
 277                         res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
 278                         res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
 279                 }
 280
 281                 request_resource(&iomem_resource, res);
 282
 283                 /*
 284                  *  We don't know which RAM region contains kernel data,
 285                  *  so we try it repeatedly and let the resource manager
 286                  *  test it.
 287                  */
 288                 request_resource(res, &code_resource);
 289                 request_resource(res, &data_resource);
 290                 request_resource(res, &bss_resource);
 291         }
 292 }
 293
 294 static int __init reserve_memblock_reserved_regions(void)
 295 {
 296         u64 i, j;
 297
 298         for (i = 0; i < num_standard_resources; ++i) {
 299                 struct resource *mem = &standard_resources[i];
 300                 phys_addr_t r_start, r_end, mem_size = resource_size(mem);
 301
 302                 if (!memblock_is_region_reserved(mem->start, mem_size))
 303                         continue;
 304
 305                 for_each_reserved_mem_range(j, &r_start, &r_end) {
 306                         resource_size_t start, end;
 307
 308                         start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
 309                         end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
 310
 311                         if (start > mem->end || end < mem->start)
 312                                 continue;
 313
 314                         reserve_region_with_split(mem, start, end, "Reserved");
 315                 }
 316         }
 317
 318         return 0;
 319 }
 320 arch_initcall(reserve_memblock_reserved_regions);
 321
 322 #ifdef CONFIG_SMP
 323 static void __init prefill_possible_map(void)
 324 {
 325         int i, possible;
 326
 327         possible = num_processors + disabled_cpus;
 328         if (possible > nr_cpu_ids)
 329                 possible = nr_cpu_ids;
 330
 331         pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 332                         possible, max((possible - num_processors), 0));
 333
 334         for (i = 0; i < possible; i++)
 335                 set_cpu_possible(i, true);
 336         for (; i < NR_CPUS; i++)
 337                 set_cpu_possible(i, false);
 338
 339         nr_cpu_ids = possible;
 340 }
 341 #endif
 342
 343 void __init setup_arch(char **cmdline_p)
 344 {
 345         cpu_probe();
 346         *cmdline_p = boot_command_line;
 347
 348         init_environ();
 349         efi_init();
 350         memblock_init();
 351         parse_early_param();
 352
 353         platform_init();
 354         pagetable_init();
 355         arch_mem_init(cmdline_p);
 356
 357         resource_init();
 358 #ifdef CONFIG_SMP
 359         plat_smp_setup();
 360         prefill_possible_map();
 361 #endif
 362
 363         paging_init();
 364 }