arch/riscv/kernel/setup.c

   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  */
   8
   9 #include <linux/init.h>
  10 #include <linux/mm.h>
  11 #include <linux/memblock.h>
  12 #include <linux/sched.h>
  13 #include <linux/console.h>
  14 #include <linux/screen_info.h>
  15 #include <linux/of_fdt.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/sched/task.h>
  18 #include <linux/swiotlb.h>
  19 #include <linux/smp.h>
  20 #include <linux/efi.h>
  21
  22 #include <asm/cpu_ops.h>
  23 #include <asm/early_ioremap.h>
  24 #include <asm/setup.h>
  25 #include <asm/sections.h>
  26 #include <asm/sbi.h>
  27 #include <asm/tlbflush.h>
  28 #include <asm/thread_info.h>
  29 #include <asm/kasan.h>
  30 #include <asm/efi.h>
  31
  32 #include "head.h"
  33
  34 #if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
  35 struct screen_info screen_info __section(".data") = {
  36         .orig_video_lines       = 30,
  37         .orig_video_cols        = 80,
  38         .orig_video_mode        = 0,
  39         .orig_video_ega_bx      = 0,
  40         .orig_video_isVGA       = 1,
  41         .orig_video_points      = 8
  42 };
  43 #endif
  44
  45 /*
  46  * The lucky hart to first increment this variable will boot the other cores.
  47  * This is used before the kernel initializes the BSS so it can't be in the
  48  * BSS.
  49  */
  50 atomic_t hart_lottery __section(".sdata");
  51 unsigned long boot_cpu_hartid;
  52 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  53
  54 static void __init parse_dtb(void)
  55 {
  56         /* Early scan of device tree from init memory */
  57         if (early_init_dt_scan(dtb_early_va))
  58                 return;
  59
  60         pr_err("No DTB passed to the kernel\n");
  61 #ifdef CONFIG_CMDLINE_FORCE
  62         strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  63         pr_info("Forcing kernel command line to: %s\n", boot_command_line);
  64 #endif
  65 }
  66
  67 void __init setup_arch(char **cmdline_p)
  68 {
  69         parse_dtb();
  70         init_mm.start_code = (unsigned long) _stext;
  71         init_mm.end_code   = (unsigned long) _etext;
  72         init_mm.end_data   = (unsigned long) _edata;
  73         init_mm.brk        = (unsigned long) _end;
  74
  75         *cmdline_p = boot_command_line;
  76
  77         early_ioremap_setup();
  78         jump_label_init();
  79         parse_early_param();
  80
  81         efi_init();
  82         setup_bootmem();
  83         paging_init();
  84 #if IS_ENABLED(CONFIG_BUILTIN_DTB)
  85         unflatten_and_copy_device_tree();
  86 #else
  87         if (early_init_dt_verify(__va(dtb_early_pa)))
  88                 unflatten_device_tree();
  89         else
  90                 pr_err("No DTB found in kernel mappings\n");
  91 #endif
  92
  93 #ifdef CONFIG_SWIOTLB
  94         swiotlb_init(1);
  95 #endif
  96
  97 #ifdef CONFIG_KASAN
  98         kasan_init();
  99 #endif
 100
 101 #if IS_ENABLED(CONFIG_RISCV_SBI)
 102         sbi_init();
 103 #endif
 104
 105 #ifdef CONFIG_SMP
 106         setup_smp();
 107 #endif
 108
 109         riscv_fill_hwcap();
 110 }
 111
 112 static int __init topology_init(void)
 113 {
 114         int i;
 115
 116         for_each_possible_cpu(i) {
 117                 struct cpu *cpu = &per_cpu(cpu_devices, i);
 118
 119                 cpu->hotpluggable = cpu_has_hotplug(i);
 120                 register_cpu(cpu, i);
 121         }
 122
 123         return 0;
 124 }
 125 subsys_initcall(topology_init);