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/smp.h>
21 #include <linux/efi.h>
22 #include <linux/crash_dump.h>
24 #include <asm/alternative.h>
25 #include <asm/cpu_ops.h>
26 #include <asm/early_ioremap.h>
27 #include <asm/pgtable.h>
28 #include <asm/setup.h>
29 #include <asm/set_memory.h>
30 #include <asm/sections.h>
32 #include <asm/tlbflush.h>
33 #include <asm/thread_info.h>
34 #include <asm/kasan.h>
39 #if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
40 struct screen_info screen_info __section(".data") = {
41 .orig_video_lines = 30,
42 .orig_video_cols = 80,
44 .orig_video_ega_bx = 0,
45 .orig_video_isVGA = 1,
46 .orig_video_points = 8
51 * The lucky hart to first increment this variable will boot the other cores.
52 * This is used before the kernel initializes the BSS so it can't be in the
55 atomic_t hart_lottery __section(".sdata")
56 #ifdef CONFIG_XIP_KERNEL
57 = ATOMIC_INIT(0xC001BEEF)
60 unsigned long boot_cpu_hartid;
61 static DEFINE_PER_CPU(struct cpu, cpu_devices);
64 * Place kernel memory regions on the resource tree so that
65 * kexec-tools can retrieve them from /proc/iomem. While there
66 * also add "System RAM" regions for compatibility with other
67 * archs, and the rest of the known regions for completeness.
69 static struct resource kimage_res = { .name = "Kernel image", };
70 static struct resource code_res = { .name = "Kernel code", };
71 static struct resource data_res = { .name = "Kernel data", };
72 static struct resource rodata_res = { .name = "Kernel rodata", };
73 static struct resource bss_res = { .name = "Kernel bss", };
74 #ifdef CONFIG_CRASH_DUMP
75 static struct resource elfcorehdr_res = { .name = "ELF Core hdr", };
78 static int __init add_resource(struct resource *parent,
83 ret = insert_resource(parent, res);
85 pr_err("Failed to add a %s resource at %llx\n",
86 res->name, (unsigned long long) res->start);
93 static int __init add_kernel_resources(void)
98 * The memory region of the kernel image is continuous and
99 * was reserved on setup_bootmem, register it here as a
100 * resource, with the various segments of the image as
104 code_res.start = __pa_symbol(_text);
105 code_res.end = __pa_symbol(_etext) - 1;
106 code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
108 rodata_res.start = __pa_symbol(__start_rodata);
109 rodata_res.end = __pa_symbol(__end_rodata) - 1;
110 rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
112 data_res.start = __pa_symbol(_data);
113 data_res.end = __pa_symbol(_edata) - 1;
114 data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
116 bss_res.start = __pa_symbol(__bss_start);
117 bss_res.end = __pa_symbol(__bss_stop) - 1;
118 bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
120 kimage_res.start = code_res.start;
121 kimage_res.end = bss_res.end;
122 kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
124 ret = add_resource(&iomem_resource, &kimage_res);
128 ret = add_resource(&kimage_res, &code_res);
132 ret = add_resource(&kimage_res, &rodata_res);
136 ret = add_resource(&kimage_res, &data_res);
140 ret = add_resource(&kimage_res, &bss_res);
145 static void __init init_resources(void)
147 struct memblock_region *region = NULL;
148 struct resource *res = NULL;
149 struct resource *mem_res = NULL;
150 size_t mem_res_sz = 0;
151 int num_resources = 0, res_idx = 0;
154 /* + 1 as memblock_alloc() might increase memblock.reserved.cnt */
155 num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
156 res_idx = num_resources - 1;
158 mem_res_sz = num_resources * sizeof(*mem_res);
159 mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES);
161 panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz);
164 * Start by adding the reserved regions, if they overlap
165 * with /memory regions, insert_resource later on will take
168 ret = add_kernel_resources();
172 #ifdef CONFIG_KEXEC_CORE
173 if (crashk_res.start != crashk_res.end) {
174 ret = add_resource(&iomem_resource, &crashk_res);
180 #ifdef CONFIG_CRASH_DUMP
181 if (elfcorehdr_size > 0) {
182 elfcorehdr_res.start = elfcorehdr_addr;
183 elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1;
184 elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
185 add_resource(&iomem_resource, &elfcorehdr_res);
189 for_each_reserved_mem_region(region) {
190 res = &mem_res[res_idx--];
192 res->name = "Reserved";
193 res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
194 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
195 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
198 * Ignore any other reserved regions within
201 if (memblock_is_memory(res->start)) {
202 /* Re-use this pre-allocated resource */
207 ret = add_resource(&iomem_resource, res);
212 /* Add /memory regions to the resource tree */
213 for_each_mem_region(region) {
214 res = &mem_res[res_idx--];
216 if (unlikely(memblock_is_nomap(region))) {
217 res->name = "Reserved";
218 res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
220 res->name = "System RAM";
221 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
224 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
225 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
227 ret = add_resource(&iomem_resource, res);
232 /* Clean-up any unused pre-allocated resources */
234 memblock_free(mem_res, (res_idx + 1) * sizeof(*mem_res));
238 /* Better an empty resource tree than an inconsistent one */
239 release_child_resources(&iomem_resource);
240 memblock_free(mem_res, mem_res_sz);
244 static void __init parse_dtb(void)
246 /* Early scan of device tree from init memory */
247 if (early_init_dt_scan(dtb_early_va)) {
248 const char *name = of_flat_dt_get_machine_name();
251 pr_info("Machine model: %s\n", name);
252 dump_stack_set_arch_desc("%s (DT)", name);
257 pr_err("No DTB passed to the kernel\n");
258 #ifdef CONFIG_CMDLINE_FORCE
259 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
260 pr_info("Forcing kernel command line to: %s\n", boot_command_line);
264 void __init setup_arch(char **cmdline_p)
267 setup_initial_init_mm(_stext, _etext, _edata, _end);
269 *cmdline_p = boot_command_line;
271 early_ioremap_setup();
277 #if IS_ENABLED(CONFIG_BUILTIN_DTB)
278 unflatten_and_copy_device_tree();
280 if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))
281 unflatten_device_tree();
283 pr_err("No DTB found in kernel mappings\n");
299 apply_boot_alternatives();
302 static int __init topology_init(void)
306 for_each_possible_cpu(i) {
307 struct cpu *cpu = &per_cpu(cpu_devices, i);
309 cpu->hotpluggable = cpu_has_hotplug(i);
310 ret = register_cpu(cpu, i);
312 pr_warn("Warning: %s: register_cpu %d failed (%d)\n",
318 subsys_initcall(topology_init);
320 void free_initmem(void)
322 if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
323 set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end),
324 IS_ENABLED(CONFIG_64BIT) ?
325 set_memory_rw : set_memory_rw_nx);
327 free_initmem_default(POISON_FREE_INITMEM);