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
parse_dtb(void)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
setup_arch(char ** cmdline_p)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 jump_label_init();
79 parse_early_param();
80
81 efi_init();
82 setup_bootmem();
83 paging_init();
84 #if IS_ENABLED(CONFIG_BUILTIN_DTB)
85 unflatten_and_copy_device_tree();
86 #else
87 if (early_init_dt_verify(__va(dtb_early_pa)))
88 unflatten_device_tree();
89 else
90 pr_err("No DTB found in kernel mappings\n");
91 #endif
92
93 #ifdef CONFIG_SWIOTLB
94 swiotlb_init(1);
95 #endif
96
97 #ifdef CONFIG_KASAN
98 kasan_init();
99 #endif
100
101 #if IS_ENABLED(CONFIG_RISCV_SBI)
102 sbi_init();
103 #endif
104
105 #ifdef CONFIG_SMP
106 setup_smp();
107 #endif
108
109 riscv_fill_hwcap();
110 }
111
topology_init(void)112 static int __init topology_init(void)
113 {
114 int i;
115
116 for_each_possible_cpu(i) {
117 struct cpu *cpu = &per_cpu(cpu_devices, i);
118
119 cpu->hotpluggable = cpu_has_hotplug(i);
120 register_cpu(cpu, i);
121 }
122
123 return 0;
124 }
125 subsys_initcall(topology_init);
126
