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/sbi.h>
  26 #include <asm/tlbflush.h>
  27 #include <asm/thread_info.h>
  28 #include <asm/kasan.h>
  29
  30 #include "head.h"
  31
  32 #ifdef CONFIG_DUMMY_CONSOLE
  33 struct screen_info screen_info = {
  34         .orig_video_lines       = 30,
  35         .orig_video_cols        = 80,
  36         .orig_video_mode        = 0,
  37         .orig_video_ega_bx      = 0,
  38         .orig_video_isVGA       = 1,
  39         .orig_video_points      = 8
  40 };
  41 #endif
  42
  43 /*
  44  * The lucky hart to first increment this variable will boot the other cores.
  45  * This is used before the kernel initializes the BSS so it can't be in the
  46  * BSS.
  47  */
  48 atomic_t hart_lottery __section(.sdata);
  49 unsigned long boot_cpu_hartid;
  50 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  51
  52 void __init parse_dtb(void)
  53 {
  54         if (early_init_dt_scan(dtb_early_va))
  55                 return;
  56
  57         pr_err("No DTB passed to the kernel\n");
  58 #ifdef CONFIG_CMDLINE_FORCE
  59         strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  60         pr_info("Forcing kernel command line to: %s\n", boot_command_line);
  61 #endif
  62 }
  63
  64 void __init setup_arch(char **cmdline_p)
  65 {
  66         init_mm.start_code = (unsigned long) _stext;
  67         init_mm.end_code   = (unsigned long) _etext;
  68         init_mm.end_data   = (unsigned long) _edata;
  69         init_mm.brk        = (unsigned long) _end;
  70
  71         *cmdline_p = boot_command_line;
  72
  73         parse_early_param();
  74
  75         setup_bootmem();
  76         paging_init();
  77 #if IS_ENABLED(CONFIG_BUILTIN_DTB)
  78         unflatten_and_copy_device_tree();
  79 #else
  80         unflatten_device_tree();
  81 #endif
  82         clint_init_boot_cpu();
  83
  84 #ifdef CONFIG_SWIOTLB
  85         swiotlb_init(1);
  86 #endif
  87
  88 #ifdef CONFIG_KASAN
  89         kasan_init();
  90 #endif
  91
  92 #if IS_ENABLED(CONFIG_RISCV_SBI)
  93         sbi_init();
  94 #endif
  95
  96 #ifdef CONFIG_SMP
  97         setup_smp();
  98 #endif
  99
 100         riscv_fill_hwcap();
 101 }
 102
 103 static int __init topology_init(void)
 104 {
 105         int i;
 106
 107         for_each_possible_cpu(i) {
 108                 struct cpu *cpu = &per_cpu(cpu_devices, i);
 109
 110                 cpu->hotpluggable = cpu_has_hotplug(i);
 111                 register_cpu(cpu, i);
 112         }
 113
 114         return 0;
 115 }
 116 subsys_initcall(topology_init);