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David Brazdil0f672f62019-12-10 10:32:29 +00001// SPDX-License-Identifier: GPL-2.0-or-later
Andrew Scullb4b6d4a2019-01-02 15:54:55 +00002/*
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
Andrew Scullb4b6d4a2019-01-02 15:54:55 +00007 */
8
9#include <linux/init.h>
10#include <linux/mm.h>
11#include <linux/memblock.h>
12#include <linux/sched.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000013#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>
Olivier Deprez157378f2022-04-04 15:47:50 +020019#include <linux/smp.h>
20#include <linux/efi.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000021
Olivier Deprez157378f2022-04-04 15:47:50 +020022#include <asm/cpu_ops.h>
23#include <asm/early_ioremap.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000024#include <asm/setup.h>
25#include <asm/sections.h>
Olivier Deprez157378f2022-04-04 15:47:50 +020026#include <asm/sbi.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000027#include <asm/tlbflush.h>
28#include <asm/thread_info.h>
Olivier Deprez157378f2022-04-04 15:47:50 +020029#include <asm/kasan.h>
30#include <asm/efi.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000031
David Brazdil0f672f62019-12-10 10:32:29 +000032#include "head.h"
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000033
Olivier Deprez157378f2022-04-04 15:47:50 +020034#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
35struct screen_info screen_info __section(".data") = {
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000036 .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
Olivier Deprez157378f2022-04-04 15:47:50 +020045/*
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 */
50atomic_t hart_lottery __section(".sdata");
David Brazdil0f672f62019-12-10 10:32:29 +000051unsigned long boot_cpu_hartid;
Olivier Deprez157378f2022-04-04 15:47:50 +020052static DEFINE_PER_CPU(struct cpu, cpu_devices);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000053
Olivier Deprez157378f2022-04-04 15:47:50 +020054static void __init parse_dtb(void)
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000055{
Olivier Deprez157378f2022-04-04 15:47:50 +020056 /* Early scan of device tree from init memory */
David Brazdil0f672f62019-12-10 10:32:29 +000057 if (early_init_dt_scan(dtb_early_va))
58 return;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000059
David Brazdil0f672f62019-12-10 10:32:29 +000060 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);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000064#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000065}
66
67void __init setup_arch(char **cmdline_p)
68{
Olivier Deprez157378f2022-04-04 15:47:50 +020069 parse_dtb();
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000070 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
David Brazdil0f672f62019-12-10 10:32:29 +000075 *cmdline_p = boot_command_line;
76
Olivier Deprez157378f2022-04-04 15:47:50 +020077 early_ioremap_setup();
78 jump_label_init();
David Brazdil0f672f62019-12-10 10:32:29 +000079 parse_early_param();
80
Olivier Deprez157378f2022-04-04 15:47:50 +020081 efi_init();
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000082 setup_bootmem();
83 paging_init();
Olivier Deprez157378f2022-04-04 15:47:50 +020084#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
David Brazdil0f672f62019-12-10 10:32:29 +000092
93#ifdef CONFIG_SWIOTLB
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000094 swiotlb_init(1);
David Brazdil0f672f62019-12-10 10:32:29 +000095#endif
Andrew Scullb4b6d4a2019-01-02 15:54:55 +000096
Olivier Deprez157378f2022-04-04 15:47:50 +020097#ifdef CONFIG_KASAN
98 kasan_init();
99#endif
100
101#if IS_ENABLED(CONFIG_RISCV_SBI)
102 sbi_init();
103#endif
104
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000105#ifdef CONFIG_SMP
106 setup_smp();
107#endif
108
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000109 riscv_fill_hwcap();
110}
Olivier Deprez157378f2022-04-04 15:47:50 +0200111
112static 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}
125subsys_initcall(topology_init);