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); 114