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
  20 #include <asm/clint.h>
  21 #include <asm/setup.h>
  22 #include <asm/sections.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/smp.h>
  25 #include <asm/tlbflush.h>
  26 #include <asm/thread_info.h>
  27
  28 #include "head.h"
  29
  30 #ifdef CONFIG_DUMMY_CONSOLE
  31 struct screen_info screen_info = {
  32         .orig_video_lines       = 30,
  33         .orig_video_cols        = 80,
  34         .orig_video_mode        = 0,
  35         .orig_video_ega_bx      = 0,
  36         .orig_video_isVGA       = 1,
  37         .orig_video_points      = 8
  38 };
  39 #endif
  40
  41 /* The lucky hart to first increment this variable will boot the other cores */
  42 atomic_t hart_lottery;
  43 unsigned long boot_cpu_hartid;
  44
  45 void __init parse_dtb(void)
  46 {
  47         if (early_init_dt_scan(dtb_early_va))
  48                 return;
  49
  50         pr_err("No DTB passed to the kernel\n");
  51 #ifdef CONFIG_CMDLINE_FORCE
  52         strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  53         pr_info("Forcing kernel command line to: %s\n", boot_command_line);
  54 #endif
  55 }
  56
  57 void __init setup_arch(char **cmdline_p)
  58 {
  59         init_mm.start_code = (unsigned long) _stext;
  60         init_mm.end_code   = (unsigned long) _etext;
  61         init_mm.end_data   = (unsigned long) _edata;
  62         init_mm.brk        = (unsigned long) _end;
  63
  64         *cmdline_p = boot_command_line;
  65
  66         parse_early_param();
  67
  68         setup_bootmem();
  69         paging_init();
  70         unflatten_device_tree();
  71         clint_init_boot_cpu();
  72
  73 #ifdef CONFIG_SWIOTLB
  74         swiotlb_init(1);
  75 #endif
  76
  77 #ifdef CONFIG_SMP
  78         setup_smp();
  79 #endif
  80
  81         riscv_fill_hwcap();
  82 }