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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
32struct 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 */
47atomic_t hart_lottery __section(.sdata);
48unsigned long boot_cpu_hartid;
49static DEFINE_PER_CPU(struct cpu, cpu_devices);
50
51void __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
63void __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
101static 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}
114subsys_initcall(topology_init);
1/*
2 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
3 * Chen Liqin <liqin.chen@sunplusct.com>
4 * Lennox Wu <lennox.wu@sunplusct.com>
5 * Copyright (C) 2012 Regents of the University of California
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see the file COPYING, or write
19 * to the Free Software Foundation, Inc.,
20 */
21
22#include <linux/init.h>
23#include <linux/mm.h>
24#include <linux/memblock.h>
25#include <linux/sched.h>
26#include <linux/initrd.h>
27#include <linux/console.h>
28#include <linux/screen_info.h>
29#include <linux/of_fdt.h>
30#include <linux/of_platform.h>
31#include <linux/sched/task.h>
32
33#include <asm/setup.h>
34#include <asm/sections.h>
35#include <asm/pgtable.h>
36#include <asm/smp.h>
37#include <asm/sbi.h>
38#include <asm/tlbflush.h>
39#include <asm/thread_info.h>
40
41#ifdef CONFIG_DUMMY_CONSOLE
42struct screen_info screen_info = {
43 .orig_video_lines = 30,
44 .orig_video_cols = 80,
45 .orig_video_mode = 0,
46 .orig_video_ega_bx = 0,
47 .orig_video_isVGA = 1,
48 .orig_video_points = 8
49};
50#endif
51
52unsigned long va_pa_offset;
53EXPORT_SYMBOL(va_pa_offset);
54unsigned long pfn_base;
55EXPORT_SYMBOL(pfn_base);
56
57unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
58EXPORT_SYMBOL(empty_zero_page);
59
60/* The lucky hart to first increment this variable will boot the other cores */
61atomic_t hart_lottery;
62
63#ifdef CONFIG_BLK_DEV_INITRD
64static void __init setup_initrd(void)
65{
66 extern char __initramfs_start[];
67 extern unsigned long __initramfs_size;
68 unsigned long size;
69
70 if (__initramfs_size > 0) {
71 initrd_start = (unsigned long)(&__initramfs_start);
72 initrd_end = initrd_start + __initramfs_size;
73 }
74
75 if (initrd_start >= initrd_end) {
76 printk(KERN_INFO "initrd not found or empty");
77 goto disable;
78 }
79 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
80 printk(KERN_ERR "initrd extends beyond end of memory");
81 goto disable;
82 }
83
84 size = initrd_end - initrd_start;
85 memblock_reserve(__pa(initrd_start), size);
86 initrd_below_start_ok = 1;
87
88 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
89 (void *)(initrd_start), size);
90 return;
91disable:
92 pr_cont(" - disabling initrd\n");
93 initrd_start = 0;
94 initrd_end = 0;
95}
96#endif /* CONFIG_BLK_DEV_INITRD */
97
98pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
99pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
100
101#ifndef __PAGETABLE_PMD_FOLDED
102#define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT)
103pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss;
104pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
105#endif
106
107asmlinkage void __init setup_vm(void)
108{
109 extern char _start;
110 uintptr_t i;
111 uintptr_t pa = (uintptr_t) &_start;
112 pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC);
113
114 va_pa_offset = PAGE_OFFSET - pa;
115 pfn_base = PFN_DOWN(pa);
116
117 /* Sanity check alignment and size */
118 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
119 BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0);
120
121#ifndef __PAGETABLE_PMD_FOLDED
122 trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
123 pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd),
124 __pgprot(_PAGE_TABLE));
125 trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot);
126
127 for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
128 size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
129 swapper_pg_dir[o] =
130 pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i,
131 __pgprot(_PAGE_TABLE));
132 }
133 for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++)
134 swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot);
135#else
136 trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
137 pfn_pgd(PFN_DOWN(pa), prot);
138
139 for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
140 size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
141 swapper_pg_dir[o] =
142 pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot);
143 }
144#endif
145}
146
147void __init parse_dtb(unsigned int hartid, void *dtb)
148{
149 early_init_dt_scan(__va(dtb));
150}
151
152static void __init setup_bootmem(void)
153{
154 struct memblock_region *reg;
155 phys_addr_t mem_size = 0;
156
157 /* Find the memory region containing the kernel */
158 for_each_memblock(memory, reg) {
159 phys_addr_t vmlinux_end = __pa(_end);
160 phys_addr_t end = reg->base + reg->size;
161
162 if (reg->base <= vmlinux_end && vmlinux_end <= end) {
163 /*
164 * Reserve from the start of the region to the end of
165 * the kernel
166 */
167 memblock_reserve(reg->base, vmlinux_end - reg->base);
168 mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
169 }
170 }
171 BUG_ON(mem_size == 0);
172
173 set_max_mapnr(PFN_DOWN(mem_size));
174 max_low_pfn = pfn_base + PFN_DOWN(mem_size);
175
176#ifdef CONFIG_BLK_DEV_INITRD
177 setup_initrd();
178#endif /* CONFIG_BLK_DEV_INITRD */
179
180 early_init_fdt_reserve_self();
181 early_init_fdt_scan_reserved_mem();
182 memblock_allow_resize();
183 memblock_dump_all();
184
185 for_each_memblock(memory, reg) {
186 unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
187 unsigned long end_pfn = memblock_region_memory_end_pfn(reg);
188
189 memblock_set_node(PFN_PHYS(start_pfn),
190 PFN_PHYS(end_pfn - start_pfn),
191 &memblock.memory, 0);
192 }
193}
194
195void __init setup_arch(char **cmdline_p)
196{
197 *cmdline_p = boot_command_line;
198
199 parse_early_param();
200
201 init_mm.start_code = (unsigned long) _stext;
202 init_mm.end_code = (unsigned long) _etext;
203 init_mm.end_data = (unsigned long) _edata;
204 init_mm.brk = (unsigned long) _end;
205
206 setup_bootmem();
207 paging_init();
208 unflatten_device_tree();
209
210#ifdef CONFIG_SMP
211 setup_smp();
212#endif
213
214#ifdef CONFIG_DUMMY_CONSOLE
215 conswitchp = &dummy_con;
216#endif
217
218 riscv_fill_hwcap();
219}
220
221static int __init riscv_device_init(void)
222{
223 return of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
224}
225subsys_initcall_sync(riscv_device_init);