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 #include <linux/efi.h> 21 22 #include <asm/cpu_ops.h> 23 #include <asm/early_ioremap.h> 24 #include <asm/setup.h> 25 #include <asm/sections.h> 26 #include <asm/sbi.h> 27 #include <asm/tlbflush.h> 28 #include <asm/thread_info.h> 29 #include <asm/kasan.h> 30 #include <asm/efi.h> 31 32 #include "head.h" 33 34 #if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI) 35 struct screen_info screen_info __section(".data") = { 36 .orig_video_lines = 30, 37 .orig_video_cols = 80, 38 .orig_video_mode = 0, 39 .orig_video_ega_bx = 0, 40 .orig_video_isVGA = 1, 41 .orig_video_points = 8 42 }; 43 #endif 44 45 /* 46 * The lucky hart to first increment this variable will boot the other cores. 47 * This is used before the kernel initializes the BSS so it can't be in the 48 * BSS. 49 */ 50 atomic_t hart_lottery __section(".sdata"); 51 unsigned long boot_cpu_hartid; 52 static DEFINE_PER_CPU(struct cpu, cpu_devices); 53 54 static void __init parse_dtb(void) 55 { 56 /* Early scan of device tree from init memory */ 57 if (early_init_dt_scan(dtb_early_va)) 58 return; 59 60 pr_err("No DTB passed to the kernel\n"); 61 #ifdef CONFIG_CMDLINE_FORCE 62 strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 63 pr_info("Forcing kernel command line to: %s\n", boot_command_line); 64 #endif 65 } 66 67 void __init setup_arch(char **cmdline_p) 68 { 69 parse_dtb(); 70 init_mm.start_code = (unsigned long) _stext; 71 init_mm.end_code = (unsigned long) _etext; 72 init_mm.end_data = (unsigned long) _edata; 73 init_mm.brk = (unsigned long) _end; 74 75 *cmdline_p = boot_command_line; 76 77 early_ioremap_setup(); 78 parse_early_param(); 79 80 efi_init(); 81 setup_bootmem(); 82 paging_init(); 83 #if IS_ENABLED(CONFIG_BUILTIN_DTB) 84 unflatten_and_copy_device_tree(); 85 #else 86 if (early_init_dt_verify(__va(dtb_early_pa))) 87 unflatten_device_tree(); 88 else 89 pr_err("No DTB found in kernel mappings\n"); 90 #endif 91 92 #ifdef CONFIG_SWIOTLB 93 swiotlb_init(1); 94 #endif 95 96 #ifdef CONFIG_KASAN 97 kasan_init(); 98 #endif 99 100 #if IS_ENABLED(CONFIG_RISCV_SBI) 101 sbi_init(); 102 #endif 103 104 #ifdef CONFIG_SMP 105 setup_smp(); 106 #endif 107 108 riscv_fill_hwcap(); 109 } 110 111 static int __init topology_init(void) 112 { 113 int i; 114 115 for_each_possible_cpu(i) { 116 struct cpu *cpu = &per_cpu(cpu_devices, i); 117 118 cpu->hotpluggable = cpu_has_hotplug(i); 119 register_cpu(cpu, i); 120 } 121 122 return 0; 123 } 124 subsys_initcall(topology_init); 125