1 files changed, 328 insertions, 0 deletions
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
new file mode 100644
index 000000000..2acf51c23
--- /dev/null
+++ b/arch/riscv/kernel/setup.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Chen Liqin <liqin.chen@sunplusct.com>
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2020 FORTH-ICS/CARV
+ *  Nick Kossifidis <mick@ics.forth.gr>
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/memblock.h>
+#include <linux/sched.h>
+#include <linux/console.h>
+#include <linux/screen_info.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <linux/sched/task.h>
+#include <linux/smp.h>
+#include <linux/efi.h>
+#include <linux/crash_dump.h>
+
+#include <asm/alternative.h>
+#include <asm/cacheflush.h>
+#include <asm/cpu_ops.h>
+#include <asm/early_ioremap.h>
+#include <asm/pgtable.h>
+#include <asm/setup.h>
+#include <asm/set_memory.h>
+#include <asm/sections.h>
+#include <asm/sbi.h>
+#include <asm/tlbflush.h>
+#include <asm/thread_info.h>
+#include <asm/kasan.h>
+#include <asm/efi.h>
+
+#include "head.h"
+
+#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
+struct screen_info screen_info __section(".data") = {
+	.orig_video_lines	= 30,
+	.orig_video_cols	= 80,
+	.orig_video_mode	= 0,
+	.orig_video_ega_bx	= 0,
+	.orig_video_isVGA	= 1,
+	.orig_video_points	= 8
+};
+#endif
+
+/*
+ * The lucky hart to first increment this variable will boot the other cores.
+ * This is used before the kernel initializes the BSS so it can't be in the
+ * BSS.
+ */
+atomic_t hart_lottery __section(".sdata")
+#ifdef CONFIG_XIP_KERNEL
+= ATOMIC_INIT(0xC001BEEF)
+#endif
+;
+unsigned long boot_cpu_hartid;
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+
+/*
+ * Place kernel memory regions on the resource tree so that
+ * kexec-tools can retrieve them from /proc/iomem. While there
+ * also add "System RAM" regions for compatibility with other
+ * archs, and the rest of the known regions for completeness.
+ */
+static struct resource kimage_res = { .name = "Kernel image", };
+static struct resource code_res = { .name = "Kernel code", };
+static struct resource data_res = { .name = "Kernel data", };
+static struct resource rodata_res = { .name = "Kernel rodata", };
+static struct resource bss_res = { .name = "Kernel bss", };
+#ifdef CONFIG_CRASH_DUMP
+static struct resource elfcorehdr_res = { .name = "ELF Core hdr", };
+#endif
+
+static int __init add_resource(struct resource *parent,
+				struct resource *res)
+{
+	int ret = 0;
+
+	ret = insert_resource(parent, res);
+	if (ret < 0) {
+		pr_err("Failed to add a %s resource at %llx\n",
+			res->name, (unsigned long long) res->start);
+		return ret;
+	}
+
+	return 1;
+}
+
+static int __init add_kernel_resources(void)
+{
+	int ret = 0;
+
+	/*
+	 * The memory region of the kernel image is continuous and
+	 * was reserved on setup_bootmem, register it here as a
+	 * resource, with the various segments of the image as
+	 * child nodes.
+	 */
+
+	code_res.start = __pa_symbol(_text);
+	code_res.end = __pa_symbol(_etext) - 1;
+	code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+	rodata_res.start = __pa_symbol(__start_rodata);
+	rodata_res.end = __pa_symbol(__end_rodata) - 1;
+	rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+	data_res.start = __pa_symbol(_data);
+	data_res.end = __pa_symbol(_edata) - 1;
+	data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+	bss_res.start = __pa_symbol(__bss_start);
+	bss_res.end = __pa_symbol(__bss_stop) - 1;
+	bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+	kimage_res.start = code_res.start;
+	kimage_res.end = bss_res.end;
+	kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+	ret = add_resource(&iomem_resource, &kimage_res);
+	if (ret < 0)
+		return ret;
+
+	ret = add_resource(&kimage_res, &code_res);
+	if (ret < 0)
+		return ret;
+
+	ret = add_resource(&kimage_res, &rodata_res);
+	if (ret < 0)
+		return ret;
+
+	ret = add_resource(&kimage_res, &data_res);
+	if (ret < 0)
+		return ret;
+
+	ret = add_resource(&kimage_res, &bss_res);
+
+	return ret;
+}
+
+static void __init init_resources(void)
+{
+	struct memblock_region *region = NULL;
+	struct resource *res = NULL;
+	struct resource *mem_res = NULL;
+	size_t mem_res_sz = 0;
+	int num_resources = 0, res_idx = 0;
+	int ret = 0;
+
+	/* + 1 as memblock_alloc() might increase memblock.reserved.cnt */
+	num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
+	res_idx = num_resources - 1;
+
+	mem_res_sz = num_resources * sizeof(*mem_res);
+	mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES);
+	if (!mem_res)
+		panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz);
+
+	/*
+	 * Start by adding the reserved regions, if they overlap
+	 * with /memory regions, insert_resource later on will take
+	 * care of it.
+	 */
+	ret = add_kernel_resources();
+	if (ret < 0)
+		goto error;
+
+#ifdef CONFIG_KEXEC_CORE
+	if (crashk_res.start != crashk_res.end) {
+		ret = add_resource(&iomem_resource, &crashk_res);
+		if (ret < 0)
+			goto error;
+	}
+#endif
+
+#ifdef CONFIG_CRASH_DUMP
+	if (elfcorehdr_size > 0) {
+		elfcorehdr_res.start = elfcorehdr_addr;
+		elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1;
+		elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+		add_resource(&iomem_resource, &elfcorehdr_res);
+	}
+#endif
+
+	for_each_reserved_mem_region(region) {
+		res = &mem_res[res_idx--];
+
+		res->name = "Reserved";
+		res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
+		res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
+		res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
+
+		/*
+		 * Ignore any other reserved regions within
+		 * system memory.
+		 */
+		if (memblock_is_memory(res->start)) {
+			/* Re-use this pre-allocated resource */
+			res_idx++;
+			continue;
+		}
+
+		ret = add_resource(&iomem_resource, res);
+		if (ret < 0)
+			goto error;
+	}
+
+	/* Add /memory regions to the resource tree */
+	for_each_mem_region(region) {
+		res = &mem_res[res_idx--];
+
+		if (unlikely(memblock_is_nomap(region))) {
+			res->name = "Reserved";
+			res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
+		} else {
+			res->name = "System RAM";
+			res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+		}
+
+		res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
+		res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+
+		ret = add_resource(&iomem_resource, res);
+		if (ret < 0)
+			goto error;
+	}
+
+	/* Clean-up any unused pre-allocated resources */
+	if (res_idx >= 0)
+		memblock_free(mem_res, (res_idx + 1) * sizeof(*mem_res));
+	return;
+
+ error:
+	/* Better an empty resource tree than an inconsistent one */
+	release_child_resources(&iomem_resource);
+	memblock_free(mem_res, mem_res_sz);
+}
+
+
+static void __init parse_dtb(void)
+{
+	/* Early scan of device tree from init memory */
+	if (early_init_dt_scan(dtb_early_va)) {
+		const char *name = of_flat_dt_get_machine_name();
+
+		if (name) {
+			pr_info("Machine model: %s\n", name);
+			dump_stack_set_arch_desc("%s (DT)", name);
+		}
+	} else {
+		pr_err("No DTB passed to the kernel\n");
+	}
+
+#ifdef CONFIG_CMDLINE_FORCE
+	strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+	pr_info("Forcing kernel command line to: %s\n", boot_command_line);
+#endif
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+	parse_dtb();
+	setup_initial_init_mm(_stext, _etext, _edata, _end);
+
+	*cmdline_p = boot_command_line;
+
+	early_ioremap_setup();
+	jump_label_init();
+	parse_early_param();
+
+	efi_init();
+	paging_init();
+#if IS_ENABLED(CONFIG_BUILTIN_DTB)
+	unflatten_and_copy_device_tree();
+#else
+	unflatten_device_tree();
+#endif
+	misc_mem_init();
+
+	init_resources();
+	sbi_init();
+
+#ifdef CONFIG_KASAN
+	kasan_init();
+#endif
+
+#ifdef CONFIG_SMP
+	setup_smp();
+#endif
+
+	riscv_init_cbom_blocksize();
+	riscv_fill_hwcap();
+	apply_boot_alternatives();
+}
+
+static int __init topology_init(void)
+{
+	int i, ret;
+
+	for_each_possible_cpu(i) {
+		struct cpu *cpu = &per_cpu(cpu_devices, i);
+
+		cpu->hotpluggable = cpu_has_hotplug(i);
+		ret = register_cpu(cpu, i);
+		if (unlikely(ret))
+			pr_warn("Warning: %s: register_cpu %d failed (%d)\n",
+			       __func__, i, ret);
+	}
+
+	return 0;
+}
+subsys_initcall(topology_init);
+
+void free_initmem(void)
+{
+	if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {
+		set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end), set_memory_rw_nx);
+		if (IS_ENABLED(CONFIG_64BIT))
+			set_kernel_memory(__init_begin, __init_end, set_memory_nx);
+	}
+
+	free_initmem_default(POISON_FREE_INITMEM);
+}