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
  21 #include <asm/clint.h>
  22 #include <asm/cpu_ops.h>
  23 #include <asm/setup.h>
  24 #include <asm/sections.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/sbi.h>
  27 #include <asm/tlbflush.h>
  28 #include <asm/thread_info.h>
  29 #include <asm/kasan.h>
  30
  31 #include "head.h"
  32
  33 #ifdef CONFIG_DUMMY_CONSOLE
  34 struct screen_info screen_info = {
  35         .orig_video_lines       = 30,
  36         .orig_video_cols        = 80,
  37         .orig_video_mode        = 0,
  38         .orig_video_ega_bx      = 0,
  39         .orig_video_isVGA       = 1,
  40         .orig_video_points      = 8
  41 };
  42 #endif
  43
  44 /*
  45  * The lucky hart to first increment this variable will boot the other cores.
  46  * This is used before the kernel initializes the BSS so it can't be in the
  47  * BSS.
  48  */
  49 atomic_t hart_lottery __section(.sdata);
  50 unsigned long boot_cpu_hartid;
  51 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  52
  53 void __init parse_dtb(void)
  54 {
  55         if (early_init_dt_scan(dtb_early_va))
  56                 return;
  57
  58         pr_err("No DTB passed to the kernel\n");
  59 #ifdef CONFIG_CMDLINE_FORCE
  60         strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  61         pr_info("Forcing kernel command line to: %s\n", boot_command_line);
  62 #endif
  63 }
  64
  65 void __init setup_arch(char **cmdline_p)
  66 {
  67         init_mm.start_code = (unsigned long) _stext;
  68         init_mm.end_code   = (unsigned long) _etext;
  69         init_mm.end_data   = (unsigned long) _edata;
  70         init_mm.brk        = (unsigned long) _end;
  71
  72         *cmdline_p = boot_command_line;
  73
  74         parse_early_param();
  75
  76         setup_bootmem();
  77         paging_init();
  78         unflatten_device_tree();
  79         clint_init_boot_cpu();
  80
  81 #ifdef CONFIG_SWIOTLB
  82         swiotlb_init(1);
  83 #endif
  84
  85 #ifdef CONFIG_KASAN
  86         kasan_init();
  87 #endif
  88
  89 #if IS_ENABLED(CONFIG_RISCV_SBI)
  90         sbi_init();
  91 #endif
  92
  93 #ifdef CONFIG_SMP
  94         setup_smp();
  95 #endif
  96
  97         riscv_fill_hwcap();
  98 }
  99
 100 static int __init topology_init(void)
 101 {
 102         int i;
 103
 104         for_each_possible_cpu(i) {
 105                 struct cpu *cpu = &per_cpu(cpu_devices, i);
 106
 107                 cpu->hotpluggable = cpu_has_hotplug(i);
 108                 register_cpu(cpu, i);
 109         }
 110
 111         return 0;
 112 }
 113 subsys_initcall(topology_init);