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); 117