Initial commit
This commit is contained in:
Ole André Vadla Ravnås
commit
169c65d57e
51358 changed files with 23120455 additions and 0 deletions
573
arch/arm64/kernel/setup.c
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573
arch/arm64/kernel/setup.c
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@ -0,0 +1,573 @@
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/*
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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/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/bootmem.h>
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#include <linux/seq_file.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/crash_dump.h>
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#include <linux/root_dev.h>
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#include <linux/clk-provider.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/of_platform.h>
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#include <linux/efi.h>
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#include <linux/sunxi-sid.h>
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#include <asm/fixmap.h>
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#include <asm/cputype.h>
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#include <asm/elf.h>
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#include <asm/cputable.h>
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#include <asm/cpu_ops.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/psci.h>
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#include <asm/efi.h>
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unsigned int processor_id;
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EXPORT_SYMBOL(processor_id);
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unsigned long elf_hwcap __read_mostly;
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EXPORT_SYMBOL_GPL(elf_hwcap);
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#ifdef CONFIG_COMPAT
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#define COMPAT_ELF_HWCAP_DEFAULT \
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(COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
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COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
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COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
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COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
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COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
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unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
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unsigned int compat_elf_hwcap2 __read_mostly;
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#endif
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static const char *cpu_name;
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static const char *machine_name;
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phys_addr_t __fdt_pointer __initdata;
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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_MEM
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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_MEM
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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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void __init early_print(const char *str, ...)
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{
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char buf[256];
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va_list ap;
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va_start(ap, str);
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vsnprintf(buf, sizeof(buf), str, ap);
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va_end(ap);
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printk("%s", buf);
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}
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void __init smp_setup_processor_id(void)
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{
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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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}
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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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#ifdef CONFIG_SMP
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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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__flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash));
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}
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#endif
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static void __init setup_processor(void)
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{
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struct cpu_info *cpu_info;
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u64 features, block;
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cpu_info = lookup_processor_type(read_cpuid_id());
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if (!cpu_info) {
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printk("CPU configuration botched (ID %08x), unable to continue.\n",
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read_cpuid_id());
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while (1);
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}
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cpu_name = cpu_info->cpu_name;
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printk("CPU: %s [%08x] revision %d\n",
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cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
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sprintf(init_utsname()->machine, ELF_PLATFORM);
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elf_hwcap = 0;
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/*
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* ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks.
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* The blocks we test below represent incremental functionality
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* for non-negative values. Negative values are reserved.
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*/
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features = read_cpuid(ID_AA64ISAR0_EL1);
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block = (features >> 4) & 0xf;
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if (!(block & 0x8)) {
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switch (block) {
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default:
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case 2:
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elf_hwcap |= HWCAP_PMULL;
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case 1:
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elf_hwcap |= HWCAP_AES;
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case 0:
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break;
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}
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}
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block = (features >> 8) & 0xf;
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if (block && !(block & 0x8))
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elf_hwcap |= HWCAP_SHA1;
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block = (features >> 12) & 0xf;
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if (block && !(block & 0x8))
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elf_hwcap |= HWCAP_SHA2;
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block = (features >> 16) & 0xf;
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if (block && !(block & 0x8))
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elf_hwcap |= HWCAP_CRC32;
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#ifdef CONFIG_COMPAT
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/*
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* ID_ISAR5_EL1 carries similar information as above, but pertaining to
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* the Aarch32 32-bit execution state.
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*/
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features = read_cpuid(ID_ISAR5_EL1);
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block = (features >> 4) & 0xf;
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if (!(block & 0x8)) {
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switch (block) {
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default:
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case 2:
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compat_elf_hwcap2 |= COMPAT_HWCAP2_PMULL;
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case 1:
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compat_elf_hwcap2 |= COMPAT_HWCAP2_AES;
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case 0:
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break;
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}
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}
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block = (features >> 8) & 0xf;
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if (block && !(block & 0x8))
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compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA1;
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block = (features >> 12) & 0xf;
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if (block && !(block & 0x8))
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compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA2;
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block = (features >> 16) & 0xf;
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if (block && !(block & 0x8))
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compat_elf_hwcap2 |= COMPAT_HWCAP2_CRC32;
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#endif
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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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struct boot_param_header *devtree;
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unsigned long dt_root;
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/* Check we have a non-NULL DT pointer */
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if (!dt_phys) {
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early_print("\n"
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"Error: NULL or invalid device tree blob\n"
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"The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
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"\nPlease check your bootloader.\n");
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while (true)
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cpu_relax();
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}
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devtree = phys_to_virt(dt_phys);
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/* Check device tree validity */
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if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
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early_print("\n"
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"Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
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"Expected 0x%x, found 0x%x\n"
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"\nPlease check your bootloader.\n",
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dt_phys, devtree, OF_DT_HEADER,
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be32_to_cpu(devtree->magic));
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while (true)
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cpu_relax();
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}
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initial_boot_params = devtree;
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dt_root = of_get_flat_dt_root();
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machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
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if (!machine_name)
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machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
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if (!machine_name)
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machine_name = "<unknown>";
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pr_info("Machine: %s\n", machine_name);
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/* Retrieve various information from the /chosen node */
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of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
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/* Initialize {size,address}-cells info */
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of_scan_flat_dt(early_init_dt_scan_root, NULL);
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/* Setup memory, calling early_init_dt_add_memory_arch */
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of_scan_flat_dt(early_init_dt_scan_memory, NULL);
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}
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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base &= PAGE_MASK;
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size &= PAGE_MASK;
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if (base + size < PHYS_OFFSET) {
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pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
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base, base + size);
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return;
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}
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if (base < PHYS_OFFSET) {
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pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
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base, PHYS_OFFSET);
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size -= PHYS_OFFSET - base;
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base = PHYS_OFFSET;
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}
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memblock_add(base, size);
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}
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void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
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{
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return __va(memblock_alloc(size, align));
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}
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|
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/*
|
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* Limit the memory size that was specified via FDT.
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*/
|
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static int __init early_mem(char *p)
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{
|
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phys_addr_t limit;
|
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|
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if (!p)
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return 1;
|
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|
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limit = memparse(p, &p) & PAGE_MASK;
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pr_notice("Memory limited to %lldMB\n", limit >> 20);
|
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|
||||
memblock_enforce_memory_limit(limit);
|
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|
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return 0;
|
||||
}
|
||||
early_param("mem", early_mem);
|
||||
|
||||
static void __init request_standard_resources(void)
|
||||
{
|
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struct memblock_region *region;
|
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struct resource *res;
|
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|
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kernel_code.start = virt_to_phys(_text);
|
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kernel_code.end = virt_to_phys(_etext - 1);
|
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kernel_data.start = virt_to_phys(_sdata);
|
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kernel_data.end = virt_to_phys(_end - 1);
|
||||
|
||||
for_each_memblock(memory, region) {
|
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res = alloc_bootmem_low(sizeof(*res));
|
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res->name = "System RAM";
|
||||
res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
|
||||
res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
|
||||
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
||||
|
||||
request_resource(&iomem_resource, res);
|
||||
|
||||
if (kernel_code.start >= res->start &&
|
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kernel_code.end <= res->end)
|
||||
request_resource(res, &kernel_code);
|
||||
if (kernel_data.start >= res->start &&
|
||||
kernel_data.end <= res->end)
|
||||
request_resource(res, &kernel_data);
|
||||
}
|
||||
}
|
||||
|
||||
u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
|
||||
|
||||
void __init setup_arch(char **cmdline_p)
|
||||
{
|
||||
setup_processor();
|
||||
|
||||
setup_machine_fdt(__fdt_pointer);
|
||||
|
||||
init_mm.start_code = (unsigned long) _text;
|
||||
init_mm.end_code = (unsigned long) _etext;
|
||||
init_mm.end_data = (unsigned long) _edata;
|
||||
init_mm.brk = (unsigned long) _end;
|
||||
|
||||
*cmdline_p = boot_command_line;
|
||||
|
||||
early_ioremap_init();
|
||||
|
||||
parse_early_param();
|
||||
|
||||
efi_init();
|
||||
arm64_memblock_init();
|
||||
|
||||
paging_init();
|
||||
request_standard_resources();
|
||||
|
||||
efi_idmap_init();
|
||||
|
||||
unflatten_device_tree();
|
||||
|
||||
psci_init();
|
||||
|
||||
cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
|
||||
cpu_read_bootcpu_ops();
|
||||
#ifdef CONFIG_SMP
|
||||
smp_init_cpus();
|
||||
smp_build_mpidr_hash();
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_VT
|
||||
#if defined(CONFIG_VGA_CONSOLE)
|
||||
conswitchp = &vga_con;
|
||||
#elif defined(CONFIG_DUMMY_CONSOLE)
|
||||
conswitchp = &dummy_con;
|
||||
#endif
|
||||
#endif
|
||||
}
|
||||
|
||||
#ifdef CONFIG_COMMON_CLK_ENABLE_SYNCBOOT_EARLY
|
||||
extern int clk_syncboot(void);
|
||||
#endif
|
||||
static int __init arm64_device_init(void)
|
||||
{
|
||||
of_clk_init(NULL);
|
||||
#ifdef CONFIG_COMMON_CLK_ENABLE_SYNCBOOT_EARLY
|
||||
clk_syncboot();
|
||||
#endif
|
||||
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
|
||||
return 0;
|
||||
}
|
||||
arch_initcall_sync(arm64_device_init);
|
||||
|
||||
static DEFINE_PER_CPU(struct cpu, cpu_data);
|
||||
|
||||
static int __init topology_init(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(i) {
|
||||
struct cpu *cpu = &per_cpu(cpu_data, i);
|
||||
cpu->hotpluggable = 1;
|
||||
register_cpu(cpu, i);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
subsys_initcall(topology_init);
|
||||
|
||||
static const char *hwcap_str[] = {
|
||||
"fp",
|
||||
"asimd",
|
||||
"evtstrm",
|
||||
"aes",
|
||||
"pmull",
|
||||
"sha1",
|
||||
"sha2",
|
||||
"crc32",
|
||||
NULL
|
||||
};
|
||||
|
||||
static int c_show(struct seq_file *m, void *v)
|
||||
{
|
||||
int i;
|
||||
|
||||
#if defined(CONFIG_ARCH_SUNXI)
|
||||
u32 serial[4];
|
||||
int ret;
|
||||
|
||||
memset(serial, 0, sizeof(serial));
|
||||
ret = sunxi_get_serial((u8 *)serial);
|
||||
#endif
|
||||
|
||||
seq_printf(m, "Processor\t: %s rev %d (%s)\n",
|
||||
cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
|
||||
|
||||
for_each_online_cpu(i) {
|
||||
/*
|
||||
* glibc reads /proc/cpuinfo to determine the number of
|
||||
* online processors, looking for lines beginning with
|
||||
* "processor". Give glibc what it expects.
|
||||
*/
|
||||
#ifdef CONFIG_SMP
|
||||
seq_printf(m, "processor\t: %d\n", i);
|
||||
#endif
|
||||
}
|
||||
|
||||
/* dump out the processor features */
|
||||
seq_puts(m, "Features\t: ");
|
||||
|
||||
for (i = 0; hwcap_str[i]; i++)
|
||||
if (elf_hwcap & (1 << i))
|
||||
seq_printf(m, "%s ", hwcap_str[i]);
|
||||
#ifdef CONFIG_ARMV7_COMPAT_CPUINFO
|
||||
if (is_compat_task()) {
|
||||
/* Print out the non-optional ARMv8 HW capabilities */
|
||||
seq_printf(m, "wp half thumb fastmult vfp edsp neon vfpv3 tlsi ");
|
||||
seq_printf(m, "vfpv4 idiva idivt ");
|
||||
}
|
||||
#endif
|
||||
|
||||
seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
|
||||
seq_printf(m, "CPU architecture: %s\n",
|
||||
#if IS_ENABLED(CONFIG_ARMV7_COMPAT_CPUINFO)
|
||||
is_compat_task() ? "8" :
|
||||
#endif
|
||||
"AArch64");
|
||||
seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
|
||||
seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
|
||||
seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
|
||||
|
||||
seq_puts(m, "\n");
|
||||
|
||||
seq_printf(m, "Hardware\t: %s\n", machine_name);
|
||||
#if defined(CONFIG_ARCH_SUNXI)
|
||||
seq_printf(m, "Serial\t\t: %04x%08x%08x\n",
|
||||
serial[2], serial[1], serial[0]);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void *c_start(struct seq_file *m, loff_t *pos)
|
||||
{
|
||||
return *pos < 1 ? (void *)1 : NULL;
|
||||
}
|
||||
|
||||
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
|
||||
{
|
||||
++*pos;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void c_stop(struct seq_file *m, void *v)
|
||||
{
|
||||
}
|
||||
|
||||
const struct seq_operations cpuinfo_op = {
|
||||
.start = c_start,
|
||||
.next = c_next,
|
||||
.stop = c_stop,
|
||||
.show = c_show
|
||||
};
|
||||
Loading…
Add table
Add a link
Reference in a new issue