1 // SPDX-License-Identifier: GPL-2.0-or-later
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 * Copyright (C) 2020 FORTH-ICS/CARV
8 * Nick Kossifidis <mick@ics.forth.gr>
11 #include <linux/init.h>
13 #include <linux/memblock.h>
14 #include <linux/sched.h>
15 #include <linux/console.h>
16 #include <linux/screen_info.h>
17 #include <linux/of_fdt.h>
18 #include <linux/of_platform.h>
19 #include <linux/sched/task.h>
20 #include <linux/swiotlb.h>
21 #include <linux/smp.h>
22 #include <linux/efi.h>
24 #include <asm/cpu_ops.h>
25 #include <asm/early_ioremap.h>
26 #include <asm/setup.h>
27 #include <asm/set_memory.h>
28 #include <asm/sections.h>
30 #include <asm/tlbflush.h>
31 #include <asm/thread_info.h>
32 #include <asm/kasan.h>
37 #if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
38 struct screen_info screen_info __section(".data") = {
39 .orig_video_lines = 30,
40 .orig_video_cols = 80,
42 .orig_video_ega_bx = 0,
43 .orig_video_isVGA = 1,
44 .orig_video_points = 8
49 * The lucky hart to first increment this variable will boot the other cores.
50 * This is used before the kernel initializes the BSS so it can't be in the
53 atomic_t hart_lottery __section(".sdata");
54 unsigned long boot_cpu_hartid;
55 static DEFINE_PER_CPU(struct cpu, cpu_devices);
58 * Place kernel memory regions on the resource tree so that
59 * kexec-tools can retrieve them from /proc/iomem. While there
60 * also add "System RAM" regions for compatibility with other
61 * archs, and the rest of the known regions for completeness.
63 static struct resource code_res = { .name = "Kernel code", };
64 static struct resource data_res = { .name = "Kernel data", };
65 static struct resource rodata_res = { .name = "Kernel rodata", };
66 static struct resource bss_res = { .name = "Kernel bss", };
68 static int __init add_resource(struct resource *parent,
73 ret = insert_resource(parent, res);
75 pr_err("Failed to add a %s resource at %llx\n",
76 res->name, (unsigned long long) res->start);
83 static int __init add_kernel_resources(struct resource *res)
88 * The memory region of the kernel image is continuous and
89 * was reserved on setup_bootmem, find it here and register
90 * it as a resource, then register the various segments of
91 * the image as child nodes
93 if (!(res->start <= code_res.start && res->end >= data_res.end))
96 res->name = "Kernel image";
97 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
100 * We removed a part of this region on setup_bootmem so
101 * we need to expand the resource for the bss to fit in.
103 res->end = bss_res.end;
105 ret = add_resource(&iomem_resource, res);
109 ret = add_resource(res, &code_res);
113 ret = add_resource(res, &rodata_res);
117 ret = add_resource(res, &data_res);
121 ret = add_resource(res, &bss_res);
126 static void __init init_resources(void)
128 struct memblock_region *region = NULL;
129 struct resource *res = NULL;
130 struct resource *mem_res = NULL;
131 size_t mem_res_sz = 0;
134 code_res.start = __pa_symbol(_text);
135 code_res.end = __pa_symbol(_etext) - 1;
136 code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
138 rodata_res.start = __pa_symbol(__start_rodata);
139 rodata_res.end = __pa_symbol(__end_rodata) - 1;
140 rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
142 data_res.start = __pa_symbol(_data);
143 data_res.end = __pa_symbol(_edata) - 1;
144 data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
146 bss_res.start = __pa_symbol(__bss_start);
147 bss_res.end = __pa_symbol(__bss_stop) - 1;
148 bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
150 mem_res_sz = (memblock.memory.cnt + memblock.reserved.cnt) * sizeof(*mem_res);
151 mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES);
153 panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz);
155 * Start by adding the reserved regions, if they overlap
156 * with /memory regions, insert_resource later on will take
159 for_each_reserved_mem_region(region) {
162 res->name = "Reserved";
163 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
164 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
165 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
167 ret = add_kernel_resources(res);
174 * Ignore any other reserved regions within
177 if (memblock_is_memory(res->start)) {
178 memblock_free((phys_addr_t) res, sizeof(struct resource));
182 ret = add_resource(&iomem_resource, res);
187 /* Add /memory regions to the resource tree */
188 for_each_mem_region(region) {
191 if (unlikely(memblock_is_nomap(region))) {
192 res->name = "Reserved";
193 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
195 res->name = "System RAM";
196 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
199 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
200 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
202 ret = add_resource(&iomem_resource, res);
210 /* Better an empty resource tree than an inconsistent one */
211 release_child_resources(&iomem_resource);
212 memblock_free((phys_addr_t) mem_res, mem_res_sz);
216 static void __init parse_dtb(void)
218 /* Early scan of device tree from init memory */
219 if (early_init_dt_scan(dtb_early_va))
222 pr_err("No DTB passed to the kernel\n");
223 #ifdef CONFIG_CMDLINE_FORCE
224 strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
225 pr_info("Forcing kernel command line to: %s\n", boot_command_line);
229 void __init setup_arch(char **cmdline_p)
232 init_mm.start_code = (unsigned long) _stext;
233 init_mm.end_code = (unsigned long) _etext;
234 init_mm.end_data = (unsigned long) _edata;
235 init_mm.brk = (unsigned long) _end;
237 *cmdline_p = boot_command_line;
239 early_ioremap_setup();
247 #if IS_ENABLED(CONFIG_BUILTIN_DTB)
248 unflatten_and_copy_device_tree();
250 if (early_init_dt_verify(__va(dtb_early_pa)))
251 unflatten_device_tree();
253 pr_err("No DTB found in kernel mappings\n");
256 if (IS_ENABLED(CONFIG_RISCV_SBI))
259 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
260 protect_kernel_text_data();
261 #ifdef CONFIG_SWIOTLB
276 static int __init topology_init(void)
280 for_each_possible_cpu(i) {
281 struct cpu *cpu = &per_cpu(cpu_devices, i);
283 cpu->hotpluggable = cpu_has_hotplug(i);
284 register_cpu(cpu, i);
289 subsys_initcall(topology_init);
291 void free_initmem(void)
293 unsigned long init_begin = (unsigned long)__init_begin;
294 unsigned long init_end = (unsigned long)__init_end;
296 set_memory_rw_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT);
297 free_initmem_default(POISON_FREE_INITMEM);