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 static void __init parse_dtb(void) 52 { 53 /* Early scan of device tree from init memory */ 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 parse_dtb(); 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 #if IS_ENABLED(CONFIG_BUILTIN_DTB) 79 unflatten_and_copy_device_tree(); 80 #else 81 if (early_init_dt_verify(__va(dtb_early_pa))) 82 unflatten_device_tree(); 83 else 84 pr_err("No DTB found in kernel mappings\n"); 85 #endif 86 87 #ifdef CONFIG_SWIOTLB 88 swiotlb_init(1); 89 #endif 90 91 #ifdef CONFIG_KASAN 92 kasan_init(); 93 #endif 94 95 #if IS_ENABLED(CONFIG_RISCV_SBI) 96 sbi_init(); 97 #endif 98 99 #ifdef CONFIG_SMP 100 setup_smp(); 101 #endif 102 103 riscv_fill_hwcap(); 104 } 105 106 static int __init topology_init(void) 107 { 108 int i; 109 110 for_each_possible_cpu(i) { 111 struct cpu *cpu = &per_cpu(cpu_devices, i); 112 113 cpu->hotpluggable = cpu_has_hotplug(i); 114 register_cpu(cpu, i); 115 } 116 117 return 0; 118 } 119 subsys_initcall(topology_init); 120