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/cpu_ops.h> 22 #include <asm/setup.h> 23 #include <asm/sections.h> 24 #include <asm/sbi.h> 25 #include <asm/tlbflush.h> 26 #include <asm/thread_info.h> 27 #include <asm/kasan.h> 28 29 #include "head.h" 30 31 #ifdef CONFIG_DUMMY_CONSOLE 32 struct screen_info screen_info = { 33 .orig_video_lines = 30, 34 .orig_video_cols = 80, 35 .orig_video_mode = 0, 36 .orig_video_ega_bx = 0, 37 .orig_video_isVGA = 1, 38 .orig_video_points = 8 39 }; 40 #endif 41 42 /* 43 * The lucky hart to first increment this variable will boot the other cores. 44 * This is used before the kernel initializes the BSS so it can't be in the 45 * BSS. 46 */ 47 atomic_t hart_lottery __section(.sdata); 48 unsigned long boot_cpu_hartid; 49 static DEFINE_PER_CPU(struct cpu, cpu_devices); 50 51 void __init parse_dtb(void) 52 { 53 if (early_init_dt_scan(dtb_early_va)) 54 return; 55 56 pr_err("No DTB passed to the kernel\n"); 57 #ifdef CONFIG_CMDLINE_FORCE 58 strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 59 pr_info("Forcing kernel command line to: %s\n", boot_command_line); 60 #endif 61 } 62 63 void __init setup_arch(char **cmdline_p) 64 { 65 init_mm.start_code = (unsigned long) _stext; 66 init_mm.end_code = (unsigned long) _etext; 67 init_mm.end_data = (unsigned long) _edata; 68 init_mm.brk = (unsigned long) _end; 69 70 *cmdline_p = boot_command_line; 71 72 parse_early_param(); 73 74 setup_bootmem(); 75 paging_init(); 76 #if IS_ENABLED(CONFIG_BUILTIN_DTB) 77 unflatten_and_copy_device_tree(); 78 #else 79 unflatten_device_tree(); 80 #endif 81 82 #ifdef CONFIG_SWIOTLB 83 swiotlb_init(1); 84 #endif 85 86 #ifdef CONFIG_KASAN 87 kasan_init(); 88 #endif 89 90 #if IS_ENABLED(CONFIG_RISCV_SBI) 91 sbi_init(); 92 #endif 93 94 #ifdef CONFIG_SMP 95 setup_smp(); 96 #endif 97 98 riscv_fill_hwcap(); 99 } 100 101 static int __init topology_init(void) 102 { 103 int i; 104 105 for_each_possible_cpu(i) { 106 struct cpu *cpu = &per_cpu(cpu_devices, i); 107 108 cpu->hotpluggable = cpu_has_hotplug(i); 109 register_cpu(cpu, i); 110 } 111 112 return 0; 113 } 114 subsys_initcall(topology_init); 115