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/setup.h>
  21 #include <asm/sections.h>
  22 #include <asm/pgtable.h>
  23 #include <asm/smp.h>
  24 #include <asm/tlbflush.h>
  25 #include <asm/thread_info.h>
  26
  27 #ifdef CONFIG_DUMMY_CONSOLE
  28 struct screen_info screen_info = {
  29         .orig_video_lines       = 30,
  30         .orig_video_cols        = 80,
  31         .orig_video_mode        = 0,
  32         .orig_video_ega_bx      = 0,
  33         .orig_video_isVGA       = 1,
  34         .orig_video_points      = 8
  35 };
  36 #endif
  37
  38 /* The lucky hart to first increment this variable will boot the other cores */
  39 atomic_t hart_lottery;
  40 unsigned long boot_cpu_hartid;
  41
  42 void __init parse_dtb(phys_addr_t dtb_phys)
  43 {
  44         void *dtb = __va(dtb_phys);
  45
  46         if (early_init_dt_scan(dtb))
  47                 return;
  48
  49         pr_err("No DTB passed to the kernel\n");
  50 #ifdef CONFIG_CMDLINE_FORCE
  51         strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  52         pr_info("Forcing kernel command line to: %s\n", boot_command_line);
  53 #endif
  54 }
  55
  56 void __init setup_arch(char **cmdline_p)
  57 {
  58         init_mm.start_code = (unsigned long) _stext;
  59         init_mm.end_code   = (unsigned long) _etext;
  60         init_mm.end_data   = (unsigned long) _edata;
  61         init_mm.brk        = (unsigned long) _end;
  62
  63         *cmdline_p = boot_command_line;
  64
  65         parse_early_param();
  66
  67         setup_bootmem();
  68         paging_init();
  69         unflatten_device_tree();
  70
  71 #ifdef CONFIG_SWIOTLB
  72         swiotlb_init(1);
  73 #endif
  74
  75 #ifdef CONFIG_SMP
  76         setup_smp();
  77 #endif
  78
  79 #ifdef CONFIG_DUMMY_CONSOLE
  80         conswitchp = &dummy_con;
  81 #endif
  82
  83         riscv_fill_hwcap();
  84 }