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485 lines
13 KiB
485 lines
13 KiB
/*
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* Based on arch/arm/kernel/setup.c
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*
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* Copyright (C) 1995-2001 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/acpi.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/utsname.h>
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#include <linux/initrd.h>
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#include <linux/console.h>
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#include <linux/cache.h>
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#include <linux/bootmem.h>
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#include <linux/screen_info.h>
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#include <linux/init.h>
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#include <linux/kexec.h>
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#include <linux/root_dev.h>
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#include <linux/cpu.h>
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#include <linux/interrupt.h>
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#include <linux/smp.h>
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#include <linux/fs.h>
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#include <linux/proc_fs.h>
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#include <linux/memblock.h>
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#include <linux/of_fdt.h>
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#include <linux/efi.h>
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#include <linux/psci.h>
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#include <linux/sched/task.h>
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#include <linux/mm.h>
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#include <linux/libfdt.h>
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#include <asm/acpi.h>
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#include <asm/fixmap.h>
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#include <asm/cpu.h>
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#include <asm/cputype.h>
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#include <asm/elf.h>
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#include <asm/cpufeature.h>
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#include <asm/cpu_ops.h>
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#include <asm/kasan.h>
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#include <asm/numa.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/smp_plat.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/traps.h>
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#include <asm/memblock.h>
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#include <asm/efi.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/mmu_context.h>
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#include <asm/system_misc.h>
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phys_addr_t __fdt_pointer __initdata;
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unsigned int boot_reason;
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EXPORT_SYMBOL(boot_reason);
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unsigned int cold_boot;
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EXPORT_SYMBOL(cold_boot);
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/*
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* Standard memory resources
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*/
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static struct resource mem_res[] = {
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{
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.name = "Kernel code",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_SYSTEM_RAM
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},
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{
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.name = "Kernel data",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_SYSTEM_RAM
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}
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};
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#define kernel_code mem_res[0]
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#define kernel_data mem_res[1]
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/*
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* The recorded values of x0 .. x3 upon kernel entry.
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*/
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u64 __cacheline_aligned boot_args[4];
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unsigned int logical_bootcpu_id __read_mostly;
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EXPORT_SYMBOL(logical_bootcpu_id);
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extern void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size,
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pgprot_t prot);
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/*
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* Parse the device tree cpu nodes and enumerate logical cpu number for
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* the boot cpu based on the mpidr value and reg value from the cpu node.
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* If the parsing fails at any point, value 0 will be returned which make
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* sure, we fallback to the default kernel behavior.
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*/
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static unsigned int __init parse_logical_bootcpu(u64 dt_phys)
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{
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void *fdt;
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int size, parent, node, len;
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unsigned int logical_cpu_id = 0;
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fdt64_t *prop;
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u64 mpidr, hwid;
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/*
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* Try to map the FDT early. If this fails, we simply bail,
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* and proceed with logical cpu as 0. We will make another
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* attempt at mapping the FDT in setup_machine()
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*/
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early_fixmap_init();
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fdt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
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if (!fdt)
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return 0;
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mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
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parent = fdt_path_offset(fdt, "/cpus");
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if (parent < 0)
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return 0;
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/*
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* Like of_parse_and_init_cpus(), we assume that the device tree
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* entries for the dt nodes are defined in ascending order for
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* populating cpu logical map.
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*/
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fdt_for_each_subnode(node, fdt, parent) {
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prop = fdt_getprop_w(fdt, node, "reg", &len);
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if (!prop || len != sizeof(u64))
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return 0;
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hwid = fdt64_to_cpu(*prop);
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if (hwid & ~MPIDR_HWID_BITMASK)
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return 0;
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/*
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* If the cpu node reg value matches the currently active
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* processor(boot cpu), we bail out from the loop.
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*/
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if (hwid == mpidr)
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return logical_cpu_id;
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logical_cpu_id++;
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if (logical_cpu_id >= NR_CPUS)
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return 0;
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}
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return 0;
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}
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DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
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/*
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* smp_processor_id() returns the current processor number which
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* internally uses per-cpu variable cpu_number. At this stage,
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* since per-cpu area is still not initialized and the kernel
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* cannot assume current processor number to be 0. This function
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* temporarily assigns the current processor to be logical_bootcpu_id,
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* which is essentially enumerated from the device tree. In later stages
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* of boot the appropriate values for cpu_number will be assigned with
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* the call to smp_prepare_cpus().
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*/
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static inline void fix_smp_processor_id(void)
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{
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per_cpu(cpu_number, 0) = logical_bootcpu_id;
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}
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void __init smp_setup_processor_id(void)
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{
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u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
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logical_bootcpu_id = parse_logical_bootcpu(__fdt_pointer);
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cpu_logical_map(logical_bootcpu_id) = mpidr;
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/*
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* clear __my_cpu_offset on boot CPU to avoid hang caused by
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* using percpu variable early, for example, lockdep will
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* access percpu variable inside lock_release
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*/
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set_my_cpu_offset(0);
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pr_info("Booting Linux on physical CPU 0x%lx\n", (unsigned long)mpidr);
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fix_smp_processor_id();
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}
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bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
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{
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return phys_id == cpu_logical_map(cpu);
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}
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struct mpidr_hash mpidr_hash;
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/**
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* smp_build_mpidr_hash - Pre-compute shifts required at each affinity
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* level in order to build a linear index from an
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* MPIDR value. Resulting algorithm is a collision
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* free hash carried out through shifting and ORing
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*/
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static void __init smp_build_mpidr_hash(void)
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{
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u32 i, affinity, fs[4], bits[4], ls;
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u64 mask = 0;
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/*
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* Pre-scan the list of MPIDRS and filter out bits that do
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* not contribute to affinity levels, ie they never toggle.
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*/
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for_each_possible_cpu(i)
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mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
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pr_debug("mask of set bits %#llx\n", mask);
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/*
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* Find and stash the last and first bit set at all affinity levels to
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* check how many bits are required to represent them.
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*/
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for (i = 0; i < 4; i++) {
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affinity = MPIDR_AFFINITY_LEVEL(mask, i);
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/*
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* Find the MSB bit and LSB bits position
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* to determine how many bits are required
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* to express the affinity level.
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*/
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ls = fls(affinity);
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fs[i] = affinity ? ffs(affinity) - 1 : 0;
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bits[i] = ls - fs[i];
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}
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/*
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* An index can be created from the MPIDR_EL1 by isolating the
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* significant bits at each affinity level and by shifting
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* them in order to compress the 32 bits values space to a
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* compressed set of values. This is equivalent to hashing
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* the MPIDR_EL1 through shifting and ORing. It is a collision free
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* hash though not minimal since some levels might contain a number
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* of CPUs that is not an exact power of 2 and their bit
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* representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}.
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*/
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mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0];
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mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0];
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mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] -
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(bits[1] + bits[0]);
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mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) +
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fs[3] - (bits[2] + bits[1] + bits[0]);
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mpidr_hash.mask = mask;
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mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0];
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pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n",
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mpidr_hash.shift_aff[0],
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mpidr_hash.shift_aff[1],
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mpidr_hash.shift_aff[2],
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mpidr_hash.shift_aff[3],
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mpidr_hash.mask,
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mpidr_hash.bits);
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/*
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* 4x is an arbitrary value used to warn on a hash table much bigger
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* than expected on most systems.
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*/
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if (mpidr_hash_size() > 4 * num_possible_cpus())
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pr_warn("Large number of MPIDR hash buckets detected\n");
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}
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const char * __init __weak arch_read_machine_name(void)
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{
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return of_flat_dt_get_machine_name();
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}
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static void __init setup_machine_fdt(phys_addr_t dt_phys)
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{
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void *dt_virt = fixmap_remap_fdt(dt_phys);
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const char *machine_name;
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if (!dt_virt || !early_init_dt_scan(dt_virt)) {
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pr_crit("\n"
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"Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n"
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"The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
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"\nPlease check your bootloader.",
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&dt_phys, dt_virt);
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while (true)
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cpu_relax();
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}
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machine_name = arch_read_machine_name();
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if (!machine_name)
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return;
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pr_info("Machine: %s\n", machine_name);
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dump_stack_set_arch_desc("%s (DT)", machine_name);
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}
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static void __init request_standard_resources(void)
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{
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struct memblock_region *region;
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struct resource *res;
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kernel_code.start = __pa_symbol(_text);
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kernel_code.end = __pa_symbol(__init_begin - 1);
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kernel_data.start = __pa_symbol(_sdata);
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kernel_data.end = __pa_symbol(_end - 1);
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for_each_memblock(memory, region) {
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res = alloc_bootmem_low(sizeof(*res));
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if (memblock_is_nomap(region)) {
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res->name = "reserved";
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res->flags = IORESOURCE_MEM;
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} else {
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res->name = "System RAM";
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res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
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}
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res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
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res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
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request_resource(&iomem_resource, res);
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if (kernel_code.start >= res->start &&
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kernel_code.end <= res->end)
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request_resource(res, &kernel_code);
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if (kernel_data.start >= res->start &&
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kernel_data.end <= res->end)
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request_resource(res, &kernel_data);
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#ifdef CONFIG_KEXEC_CORE
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/* Userspace will find "Crash kernel" region in /proc/iomem. */
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if (crashk_res.end && crashk_res.start >= res->start &&
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crashk_res.end <= res->end)
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request_resource(res, &crashk_res);
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#endif
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}
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}
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u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
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void __init __weak init_random_pool(void) { }
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void __init setup_arch(char **cmdline_p)
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{
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pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
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sprintf(init_utsname()->machine, UTS_MACHINE);
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init_mm.start_code = (unsigned long) _text;
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init_mm.end_code = (unsigned long) _etext;
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init_mm.end_data = (unsigned long) _edata;
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init_mm.brk = (unsigned long) _end;
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*cmdline_p = boot_command_line;
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early_fixmap_init();
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early_ioremap_init();
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setup_machine_fdt(__fdt_pointer);
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/*
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* Initialise the static keys early as they may be enabled by the
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* cpufeature code and early parameters.
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*/
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jump_label_init();
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parse_early_param();
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/*
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* Unmask asynchronous aborts after bringing up possible earlycon.
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* (Report possible System Errors once we can report this occurred)
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*/
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local_async_enable();
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/*
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* TTBR0 is only used for the identity mapping at this stage. Make it
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* point to zero page to avoid speculatively fetching new entries.
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*/
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cpu_uninstall_idmap();
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xen_early_init();
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efi_init();
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arm64_memblock_init();
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paging_init();
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acpi_table_upgrade();
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/* Parse the ACPI tables for possible boot-time configuration */
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acpi_boot_table_init();
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if (acpi_disabled)
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unflatten_device_tree();
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bootmem_init();
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kasan_init();
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request_standard_resources();
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early_ioremap_reset();
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if (acpi_disabled)
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psci_dt_init();
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else
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psci_acpi_init();
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cpu_read_bootcpu_ops();
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smp_init_cpus();
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smp_build_mpidr_hash();
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/* Init percpu seeds for random tags after cpus are set up. */
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kasan_init_tags();
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#ifdef CONFIG_ARM64_SW_TTBR0_PAN
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/*
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* Make sure init_thread_info.ttbr0 always generates translation
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* faults in case uaccess_enable() is inadvertently called by the init
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* thread.
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*/
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init_task.thread_info.ttbr0 = __pa_symbol(empty_zero_page);
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#endif
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#ifdef CONFIG_VT
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#if defined(CONFIG_VGA_CONSOLE)
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conswitchp = &vga_con;
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#elif defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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#endif
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if (boot_args[1] || boot_args[2] || boot_args[3]) {
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pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n"
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"\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n"
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"This indicates a broken bootloader or old kernel\n",
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boot_args[1], boot_args[2], boot_args[3]);
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}
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init_random_pool();
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}
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static int __init topology_init(void)
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{
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int i;
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for_each_online_node(i)
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register_one_node(i);
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for_each_possible_cpu(i) {
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struct cpu *cpu = &per_cpu(cpu_data.cpu, i);
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cpu->hotpluggable = 1;
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register_cpu(cpu, i);
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}
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return 0;
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}
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postcore_initcall(topology_init);
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/*
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* Dump out kernel offset information on panic.
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*/
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static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
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void *p)
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{
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const unsigned long offset = kaslr_offset();
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if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && offset > 0) {
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pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
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offset, KIMAGE_VADDR);
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} else {
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pr_emerg("Kernel Offset: disabled\n");
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}
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return 0;
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}
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static struct notifier_block kernel_offset_notifier = {
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.notifier_call = dump_kernel_offset
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};
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static int __init register_kernel_offset_dumper(void)
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{
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atomic_notifier_chain_register(&panic_notifier_list,
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&kernel_offset_notifier);
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return 0;
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}
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__initcall(register_kernel_offset_dumper);
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