arch/riscv/kernel/setup.c

   1 /*
   2  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
   3  *  Chen Liqin <liqin.chen@sunplusct.com>
   4  *  Lennox Wu <lennox.wu@sunplusct.com>
   5  * Copyright (C) 2012 Regents of the University of California
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see the file COPYING, or write
  19  * to the Free Software Foundation, Inc.,
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/mm.h>
  24 #include <linux/memblock.h>
  25 #include <linux/sched.h>
  26 #include <linux/console.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/of_fdt.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/sched/task.h>
  31 #include <linux/swiotlb.h>
  32
  33 #include <asm/setup.h>
  34 #include <asm/sections.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/smp.h>
  37 #include <asm/tlbflush.h>
  38 #include <asm/thread_info.h>
  39
  40 #ifdef CONFIG_DUMMY_CONSOLE
  41 struct screen_info screen_info = {
  42         .orig_video_lines       = 30,
  43         .orig_video_cols        = 80,
  44         .orig_video_mode        = 0,
  45         .orig_video_ega_bx      = 0,
  46         .orig_video_isVGA       = 1,
  47         .orig_video_points      = 8
  48 };
  49 #endif
  50
  51 unsigned long va_pa_offset;
  52 EXPORT_SYMBOL(va_pa_offset);
  53 unsigned long pfn_base;
  54 EXPORT_SYMBOL(pfn_base);
  55
  56 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
  57 EXPORT_SYMBOL(empty_zero_page);
  58
  59 /* The lucky hart to first increment this variable will boot the other cores */
  60 atomic_t hart_lottery;
  61 unsigned long boot_cpu_hartid;
  62
  63 void __init parse_dtb(unsigned int hartid, void *dtb)
  64 {
  65         if (early_init_dt_scan(__va(dtb)))
  66                 return;
  67
  68         pr_err("No DTB passed to the kernel\n");
  69 #ifdef CONFIG_CMDLINE_FORCE
  70         strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
  71         pr_info("Forcing kernel command line to: %s\n", boot_command_line);
  72 #endif
  73 }
  74
  75 void __init setup_arch(char **cmdline_p)
  76 {
  77         init_mm.start_code = (unsigned long) _stext;
  78         init_mm.end_code   = (unsigned long) _etext;
  79         init_mm.end_data   = (unsigned long) _edata;
  80         init_mm.brk        = (unsigned long) _end;
  81
  82         *cmdline_p = boot_command_line;
  83
  84         parse_early_param();
  85
  86         setup_bootmem();
  87         paging_init();
  88         unflatten_device_tree();
  89
  90 #ifdef CONFIG_SWIOTLB
  91         swiotlb_init(1);
  92 #endif
  93
  94 #ifdef CONFIG_SMP
  95         setup_smp();
  96 #endif
  97
  98 #ifdef CONFIG_DUMMY_CONSOLE
  99         conswitchp = &dummy_con;
 100 #endif
 101
 102         riscv_fill_hwcap();
 103 }