1 files changed, 459 insertions, 0 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
new file mode 100644
index 000000000..417a8a86b
--- /dev/null
+++ b/arch/arm64/kernel/setup.c
@@ -0,0 +1,459 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Based on arch/arm/kernel/setup.c
+ *
+ * Copyright (C) 1995-2001 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ */
+
+#include <linux/acpi.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/console.h>
+#include <linux/cache.h>
+#include <linux/screen_info.h>
+#include <linux/init.h>
+#include <linux/kexec.h>
+#include <linux/root_dev.h>
+#include <linux/cpu.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+#include <linux/panic_notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+#include <linux/efi.h>
+#include <linux/psci.h>
+#include <linux/sched/task.h>
+#include <linux/scs.h>
+#include <linux/mm.h>
+
+#include <asm/acpi.h>
+#include <asm/fixmap.h>
+#include <asm/cpu.h>
+#include <asm/cputype.h>
+#include <asm/daifflags.h>
+#include <asm/elf.h>
+#include <asm/cpufeature.h>
+#include <asm/cpu_ops.h>
+#include <asm/kasan.h>
+#include <asm/numa.h>
+#include <asm/scs.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/smp_plat.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/traps.h>
+#include <asm/efi.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/mmu_context.h>
+
+static int num_standard_resources;
+static struct resource *standard_resources;
+
+phys_addr_t __fdt_pointer __initdata;
+u64 mmu_enabled_at_boot __initdata;
+
+/*
+ * Standard memory resources
+ */
+static struct resource mem_res[] = {
+	{
+		.name = "Kernel code",
+		.start = 0,
+		.end = 0,
+		.flags = IORESOURCE_SYSTEM_RAM
+	},
+	{
+		.name = "Kernel data",
+		.start = 0,
+		.end = 0,
+		.flags = IORESOURCE_SYSTEM_RAM
+	}
+};
+
+#define kernel_code mem_res[0]
+#define kernel_data mem_res[1]
+
+/*
+ * The recorded values of x0 .. x3 upon kernel entry.
+ */
+u64 __cacheline_aligned boot_args[4];
+
+void __init smp_setup_processor_id(void)
+{
+	u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
+	set_cpu_logical_map(0, mpidr);
+
+	pr_info("Booting Linux on physical CPU 0x%010lx [0x%08x]\n",
+		(unsigned long)mpidr, read_cpuid_id());
+}
+
+bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
+{
+	return phys_id == cpu_logical_map(cpu);
+}
+
+struct mpidr_hash mpidr_hash;
+/**
+ * smp_build_mpidr_hash - Pre-compute shifts required at each affinity
+ *			  level in order to build a linear index from an
+ *			  MPIDR value. Resulting algorithm is a collision
+ *			  free hash carried out through shifting and ORing
+ */
+static void __init smp_build_mpidr_hash(void)
+{
+	u32 i, affinity, fs[4], bits[4], ls;
+	u64 mask = 0;
+	/*
+	 * Pre-scan the list of MPIDRS and filter out bits that do
+	 * not contribute to affinity levels, ie they never toggle.
+	 */
+	for_each_possible_cpu(i)
+		mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
+	pr_debug("mask of set bits %#llx\n", mask);
+	/*
+	 * Find and stash the last and first bit set at all affinity levels to
+	 * check how many bits are required to represent them.
+	 */
+	for (i = 0; i < 4; i++) {
+		affinity = MPIDR_AFFINITY_LEVEL(mask, i);
+		/*
+		 * Find the MSB bit and LSB bits position
+		 * to determine how many bits are required
+		 * to express the affinity level.
+		 */
+		ls = fls(affinity);
+		fs[i] = affinity ? ffs(affinity) - 1 : 0;
+		bits[i] = ls - fs[i];
+	}
+	/*
+	 * An index can be created from the MPIDR_EL1 by isolating the
+	 * significant bits at each affinity level and by shifting
+	 * them in order to compress the 32 bits values space to a
+	 * compressed set of values. This is equivalent to hashing
+	 * the MPIDR_EL1 through shifting and ORing. It is a collision free
+	 * hash though not minimal since some levels might contain a number
+	 * of CPUs that is not an exact power of 2 and their bit
+	 * representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}.
+	 */
+	mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
+	mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
+	mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
+						(bits[1] + bits[0]);
+	mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
+				  fs[3] - (bits[2] + bits[1] + bits[0]);
+	mpidr_hash.mask = mask;
+	mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
+	pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
+		mpidr_hash.shift_aff[0],
+		mpidr_hash.shift_aff[1],
+		mpidr_hash.shift_aff[2],
+		mpidr_hash.shift_aff[3],
+		mpidr_hash.mask,
+		mpidr_hash.bits);
+	/*
+	 * 4x is an arbitrary value used to warn on a hash table much bigger
+	 * than expected on most systems.
+	 */
+	if (mpidr_hash_size() > 4 * num_possible_cpus())
+		pr_warn("Large number of MPIDR hash buckets detected\n");
+}
+
+static void *early_fdt_ptr __initdata;
+
+void __init *get_early_fdt_ptr(void)
+{
+	return early_fdt_ptr;
+}
+
+asmlinkage void __init early_fdt_map(u64 dt_phys)
+{
+	int fdt_size;
+
+	early_fixmap_init();
+	early_fdt_ptr = fixmap_remap_fdt(dt_phys, &fdt_size, PAGE_KERNEL);
+}
+
+static void __init setup_machine_fdt(phys_addr_t dt_phys)
+{
+	int size;
+	void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
+	const char *name;
+
+	if (dt_virt)
+		memblock_reserve(dt_phys, size);
+
+	if (!dt_virt || !early_init_dt_scan(dt_virt)) {
+		pr_crit("\n"
+			"Error: invalid device tree blob at physical address %pa (virtual address 0x%px)\n"
+			"The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
+			"\nPlease check your bootloader.",
+			&dt_phys, dt_virt);
+
+		/*
+		 * Note that in this _really_ early stage we cannot even BUG()
+		 * or oops, so the least terrible thing to do is cpu_relax(),
+		 * or else we could end-up printing non-initialized data, etc.
+		 */
+		while (true)
+			cpu_relax();
+	}
+
+	/* Early fixups are done, map the FDT as read-only now */
+	fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
+
+	name = of_flat_dt_get_machine_name();
+	if (!name)
+		return;
+
+	pr_info("Machine model: %s\n", name);
+	dump_stack_set_arch_desc("%s (DT)", name);
+}
+
+static void __init request_standard_resources(void)
+{
+	struct memblock_region *region;
+	struct resource *res;
+	unsigned long i = 0;
+	size_t res_size;
+
+	kernel_code.start   = __pa_symbol(_stext);
+	kernel_code.end     = __pa_symbol(__init_begin - 1);
+	kernel_data.start   = __pa_symbol(_sdata);
+	kernel_data.end     = __pa_symbol(_end - 1);
+	insert_resource(&iomem_resource, &kernel_code);
+	insert_resource(&iomem_resource, &kernel_data);
+
+	num_standard_resources = memblock.memory.cnt;
+	res_size = num_standard_resources * sizeof(*standard_resources);
+	standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
+	if (!standard_resources)
+		panic("%s: Failed to allocate %zu bytes\n", __func__, res_size);
+
+	for_each_mem_region(region) {
+		res = &standard_resources[i++];
+		if (memblock_is_nomap(region)) {
+			res->name  = "reserved";
+			res->flags = IORESOURCE_MEM;
+			res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
+			res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
+		} 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;
+		}
+
+		insert_resource(&iomem_resource, res);
+	}
+}
+
+static int __init reserve_memblock_reserved_regions(void)
+{
+	u64 i, j;
+
+	for (i = 0; i < num_standard_resources; ++i) {
+		struct resource *mem = &standard_resources[i];
+		phys_addr_t r_start, r_end, mem_size = resource_size(mem);
+
+		if (!memblock_is_region_reserved(mem->start, mem_size))
+			continue;
+
+		for_each_reserved_mem_range(j, &r_start, &r_end) {
+			resource_size_t start, end;
+
+			start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
+			end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
+
+			if (start > mem->end || end < mem->start)
+				continue;
+
+			reserve_region_with_split(mem, start, end, "reserved");
+		}
+	}
+
+	return 0;
+}
+arch_initcall(reserve_memblock_reserved_regions);
+
+u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
+
+u64 cpu_logical_map(unsigned int cpu)
+{
+	return __cpu_logical_map[cpu];
+}
+
+void __init __no_sanitize_address setup_arch(char **cmdline_p)
+{
+	setup_initial_init_mm(_stext, _etext, _edata, _end);
+
+	*cmdline_p = boot_command_line;
+
+	kaslr_init();
+
+	/*
+	 * If know now we are going to need KPTI then use non-global
+	 * mappings from the start, avoiding the cost of rewriting
+	 * everything later.
+	 */
+	arm64_use_ng_mappings = kaslr_requires_kpti();
+
+	early_fixmap_init();
+	early_ioremap_init();
+
+	setup_machine_fdt(__fdt_pointer);
+
+	/*
+	 * Initialise the static keys early as they may be enabled by the
+	 * cpufeature code and early parameters.
+	 */
+	jump_label_init();
+	parse_early_param();
+
+	dynamic_scs_init();
+
+	/*
+	 * Unmask asynchronous aborts and fiq after bringing up possible
+	 * earlycon. (Report possible System Errors once we can report this
+	 * occurred).
+	 */
+	local_daif_restore(DAIF_PROCCTX_NOIRQ);
+
+	/*
+	 * TTBR0 is only used for the identity mapping at this stage. Make it
+	 * point to zero page to avoid speculatively fetching new entries.
+	 */
+	cpu_uninstall_idmap();
+
+	xen_early_init();
+	efi_init();
+
+	if (!efi_enabled(EFI_BOOT)) {
+		if ((u64)_text % MIN_KIMG_ALIGN)
+			pr_warn(FW_BUG "Kernel image misaligned at boot, please fix your bootloader!");
+		WARN_TAINT(mmu_enabled_at_boot, TAINT_FIRMWARE_WORKAROUND,
+			   FW_BUG "Booted with MMU enabled!");
+	}
+
+	arm64_memblock_init();
+
+	paging_init();
+
+	acpi_table_upgrade();
+
+	/* Parse the ACPI tables for possible boot-time configuration */
+	acpi_boot_table_init();
+
+	if (acpi_disabled)
+		unflatten_device_tree();
+
+	bootmem_init();
+
+	kasan_init();
+
+	request_standard_resources();
+
+	early_ioremap_reset();
+
+	if (acpi_disabled)
+		psci_dt_init();
+	else
+		psci_acpi_init();
+
+	init_bootcpu_ops();
+	smp_init_cpus();
+	smp_build_mpidr_hash();
+
+	/* Init percpu seeds for random tags after cpus are set up. */
+	kasan_init_sw_tags();
+
+#ifdef CONFIG_ARM64_SW_TTBR0_PAN
+	/*
+	 * Make sure init_thread_info.ttbr0 always generates translation
+	 * faults in case uaccess_enable() is inadvertently called by the init
+	 * thread.
+	 */
+	init_task.thread_info.ttbr0 = phys_to_ttbr(__pa_symbol(reserved_pg_dir));
+#endif
+
+	if (boot_args[1] || boot_args[2] || boot_args[3]) {
+		pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
+			"\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
+			"This indicates a broken bootloader or old kernel\n",
+			boot_args[1], boot_args[2], boot_args[3]);
+	}
+}
+
+static inline bool cpu_can_disable(unsigned int cpu)
+{
+#ifdef CONFIG_HOTPLUG_CPU
+	const struct cpu_operations *ops = get_cpu_ops(cpu);
+
+	if (ops && ops->cpu_can_disable)
+		return ops->cpu_can_disable(cpu);
+#endif
+	return false;
+}
+
+static int __init topology_init(void)
+{
+	int i;
+
+	for_each_possible_cpu(i) {
+		struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
+		cpu->hotpluggable = cpu_can_disable(i);
+		register_cpu(cpu, i);
+	}
+
+	return 0;
+}
+subsys_initcall(topology_init);
+
+static void dump_kernel_offset(void)
+{
+	const unsigned long offset = kaslr_offset();
+
+	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
+		pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
+			 offset, KIMAGE_VADDR);
+		pr_emerg("PHYS_OFFSET: 0x%llx\n", PHYS_OFFSET);
+	} else {
+		pr_emerg("Kernel Offset: disabled\n");
+	}
+}
+
+static int arm64_panic_block_dump(struct notifier_block *self,
+				  unsigned long v, void *p)
+{
+	dump_kernel_offset();
+	dump_cpu_features();
+	dump_mem_limit();
+	return 0;
+}
+
+static struct notifier_block arm64_panic_block = {
+	.notifier_call = arm64_panic_block_dump
+};
+
+static int __init register_arm64_panic_block(void)
+{
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &arm64_panic_block);
+	return 0;
+}
+device_initcall(register_arm64_panic_block);
+
+static int __init check_mmu_enabled_at_boot(void)
+{
+	if (!efi_enabled(EFI_BOOT) && mmu_enabled_at_boot)
+		panic("Non-EFI boot detected with MMU and caches enabled");
+	return 0;
+}
+device_initcall_sync(check_mmu_enabled_at_boot);