/* * Copyright (C) 2013 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASM_PERCPU_H #define __ASM_PERCPU_H #include <asm/alternative.h> #include <asm/stack_pointer.h> static inline void set_my_cpu_offset(unsigned long off) { asm volatile(ALTERNATIVE("msr tpidr_el1, %0", "msr tpidr_el2, %0", ARM64_HAS_VIRT_HOST_EXTN) :: "r" (off) : "memory"); } static inline unsigned long __my_cpu_offset(void) { unsigned long off; /* * We want to allow caching the value, so avoid using volatile and * instead use a fake stack read to hazard against barrier(). */ asm(ALTERNATIVE("mrs %0, tpidr_el1", "mrs %0, tpidr_el2", ARM64_HAS_VIRT_HOST_EXTN) : "=r" (off) : "Q" (*(const unsigned long *)current_stack_pointer)); return off; } #define __my_cpu_offset __my_cpu_offset() #define PERCPU_OP(op, asm_op) \ static inline unsigned long __percpu_##op(void *ptr, \ unsigned long val, int size) \ { \ unsigned long loop, ret; \ \ switch (size) { \ case 1: \ asm ("//__per_cpu_" #op "_1\n" \ "1: ldxrb %w[ret], %[ptr]\n" \ #asm_op " %w[ret], %w[ret], %w[val]\n" \ " stxrb %w[loop], %w[ret], %[ptr]\n" \ " cbnz %w[loop], 1b" \ : [loop] "=&r" (loop), [ret] "=&r" (ret), \ [ptr] "+Q"(*(u8 *)ptr) \ : [val] "Ir" (val)); \ break; \ case 2: \ asm ("//__per_cpu_" #op "_2\n" \ "1: ldxrh %w[ret], %[ptr]\n" \ #asm_op " %w[ret], %w[ret], %w[val]\n" \ " stxrh %w[loop], %w[ret], %[ptr]\n" \ " cbnz %w[loop], 1b" \ : [loop] "=&r" (loop), [ret] "=&r" (ret), \ [ptr] "+Q"(*(u16 *)ptr) \ : [val] "Ir" (val)); \ break; \ case 4: \ asm ("//__per_cpu_" #op "_4\n" \ "1: ldxr %w[ret], %[ptr]\n" \ #asm_op " %w[ret], %w[ret], %w[val]\n" \ " stxr %w[loop], %w[ret], %[ptr]\n" \ " cbnz %w[loop], 1b" \ : [loop] "=&r" (loop), [ret] "=&r" (ret), \ [ptr] "+Q"(*(u32 *)ptr) \ : [val] "Ir" (val)); \ break; \ case 8: \ asm ("//__per_cpu_" #op "_8\n" \ "1: ldxr %[ret], %[ptr]\n" \ #asm_op " %[ret], %[ret], %[val]\n" \ " stxr %w[loop], %[ret], %[ptr]\n" \ " cbnz %w[loop], 1b" \ : [loop] "=&r" (loop), [ret] "=&r" (ret), \ [ptr] "+Q"(*(u64 *)ptr) \ : [val] "Ir" (val)); \ break; \ default: \ ret = 0; \ BUILD_BUG(); \ } \ \ return ret; \ } PERCPU_OP(add, add) PERCPU_OP(and, and) PERCPU_OP(or, orr) #undef PERCPU_OP static inline unsigned long __percpu_read(void *ptr, int size) { unsigned long ret; switch (size) { case 1: ret = READ_ONCE(*(u8 *)ptr); break; case 2: ret = READ_ONCE(*(u16 *)ptr); break; case 4: ret = READ_ONCE(*(u32 *)ptr); break; case 8: ret = READ_ONCE(*(u64 *)ptr); break; default: ret = 0; BUILD_BUG(); } return ret; } static inline void __percpu_write(void *ptr, unsigned long val, int size) { switch (size) { case 1: WRITE_ONCE(*(u8 *)ptr, (u8)val); break; case 2: WRITE_ONCE(*(u16 *)ptr, (u16)val); break; case 4: WRITE_ONCE(*(u32 *)ptr, (u32)val); break; case 8: WRITE_ONCE(*(u64 *)ptr, (u64)val); break; default: BUILD_BUG(); } } static inline unsigned long __percpu_xchg(void *ptr, unsigned long val, int size) { unsigned long ret, loop; switch (size) { case 1: asm ("//__percpu_xchg_1\n" "1: ldxrb %w[ret], %[ptr]\n" " stxrb %w[loop], %w[val], %[ptr]\n" " cbnz %w[loop], 1b" : [loop] "=&r"(loop), [ret] "=&r"(ret), [ptr] "+Q"(*(u8 *)ptr) : [val] "r" (val)); break; case 2: asm ("//__percpu_xchg_2\n" "1: ldxrh %w[ret], %[ptr]\n" " stxrh %w[loop], %w[val], %[ptr]\n" " cbnz %w[loop], 1b" : [loop] "=&r"(loop), [ret] "=&r"(ret), [ptr] "+Q"(*(u16 *)ptr) : [val] "r" (val)); break; case 4: asm ("//__percpu_xchg_4\n" "1: ldxr %w[ret], %[ptr]\n" " stxr %w[loop], %w[val], %[ptr]\n" " cbnz %w[loop], 1b" : [loop] "=&r"(loop), [ret] "=&r"(ret), [ptr] "+Q"(*(u32 *)ptr) : [val] "r" (val)); break; case 8: asm ("//__percpu_xchg_8\n" "1: ldxr %[ret], %[ptr]\n" " stxr %w[loop], %[val], %[ptr]\n" " cbnz %w[loop], 1b" : [loop] "=&r"(loop), [ret] "=&r"(ret), [ptr] "+Q"(*(u64 *)ptr) : [val] "r" (val)); break; default: ret = 0; BUILD_BUG(); } return ret; } #define _percpu_read(pcp) \ ({ \ typeof(pcp) __retval; \ preempt_disable_notrace(); \ __retval = (typeof(pcp))__percpu_read(raw_cpu_ptr(&(pcp)), \ sizeof(pcp)); \ preempt_enable_notrace(); \ __retval; \ }) #define _percpu_write(pcp, val) \ do { \ preempt_disable_notrace(); \ __percpu_write(raw_cpu_ptr(&(pcp)), (unsigned long)(val), \ sizeof(pcp)); \ preempt_enable_notrace(); \ } while(0) \ #define _pcp_protect(operation, pcp, val) \ ({ \ typeof(pcp) __retval; \ preempt_disable(); \ __retval = (typeof(pcp))operation(raw_cpu_ptr(&(pcp)), \ (val), sizeof(pcp)); \ preempt_enable(); \ __retval; \ }) #define _percpu_add(pcp, val) \ _pcp_protect(__percpu_add, pcp, val) #define _percpu_add_return(pcp, val) _percpu_add(pcp, val) #define _percpu_and(pcp, val) \ _pcp_protect(__percpu_and, pcp, val) #define _percpu_or(pcp, val) \ _pcp_protect(__percpu_or, pcp, val) #define _percpu_xchg(pcp, val) (typeof(pcp)) \ _pcp_protect(__percpu_xchg, pcp, (unsigned long)(val)) #define this_cpu_add_1(pcp, val) _percpu_add(pcp, val) #define this_cpu_add_2(pcp, val) _percpu_add(pcp, val) #define this_cpu_add_4(pcp, val) _percpu_add(pcp, val) #define this_cpu_add_8(pcp, val) _percpu_add(pcp, val) #define this_cpu_add_return_1(pcp, val) _percpu_add_return(pcp, val) #define this_cpu_add_return_2(pcp, val) _percpu_add_return(pcp, val) #define this_cpu_add_return_4(pcp, val) _percpu_add_return(pcp, val) #define this_cpu_add_return_8(pcp, val) _percpu_add_return(pcp, val) #define this_cpu_and_1(pcp, val) _percpu_and(pcp, val) #define this_cpu_and_2(pcp, val) _percpu_and(pcp, val) #define this_cpu_and_4(pcp, val) _percpu_and(pcp, val) #define this_cpu_and_8(pcp, val) _percpu_and(pcp, val) #define this_cpu_or_1(pcp, val) _percpu_or(pcp, val) #define this_cpu_or_2(pcp, val) _percpu_or(pcp, val) #define this_cpu_or_4(pcp, val) _percpu_or(pcp, val) #define this_cpu_or_8(pcp, val) _percpu_or(pcp, val) #define this_cpu_read_1(pcp) _percpu_read(pcp) #define this_cpu_read_2(pcp) _percpu_read(pcp) #define this_cpu_read_4(pcp) _percpu_read(pcp) #define this_cpu_read_8(pcp) _percpu_read(pcp) #define this_cpu_write_1(pcp, val) _percpu_write(pcp, val) #define this_cpu_write_2(pcp, val) _percpu_write(pcp, val) #define this_cpu_write_4(pcp, val) _percpu_write(pcp, val) #define this_cpu_write_8(pcp, val) _percpu_write(pcp, val) #define this_cpu_xchg_1(pcp, val) _percpu_xchg(pcp, val) #define this_cpu_xchg_2(pcp, val) _percpu_xchg(pcp, val) #define this_cpu_xchg_4(pcp, val) _percpu_xchg(pcp, val) #define this_cpu_xchg_8(pcp, val) _percpu_xchg(pcp, val) #include <asm-generic/percpu.h> #endif /* __ASM_PERCPU_H */
Name | Type | Size | Permission | Actions |
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xen | Folder | 0755 |
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Kbuild | File | 703 B | 0644 |
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acenv.h | File | 541 B | 0644 |
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acpi.h | File | 4.34 KB | 0644 |
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alternative.h | File | 7.63 KB | 0644 |
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arch_gicv3.h | File | 3.44 KB | 0644 |
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arch_timer.h | File | 4.87 KB | 0644 |
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arm-cci.h | File | 794 B | 0644 |
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asm-bug.h | File | 1.45 KB | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asm-uaccess.h | File | 2.09 KB | 0644 |
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assembler.h | File | 13.51 KB | 0644 |
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atomic.h | File | 8.35 KB | 0644 |
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atomic_ll_sc.h | File | 10.61 KB | 0644 |
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atomic_lse.h | File | 14.82 KB | 0644 |
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barrier.h | File | 3.78 KB | 0644 |
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bitops.h | File | 1.9 KB | 0644 |
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bitrev.h | File | 452 B | 0644 |
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boot.h | File | 384 B | 0644 |
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brk-imm.h | File | 706 B | 0644 |
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bug.h | File | 1.09 KB | 0644 |
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cache.h | File | 2.23 KB | 0644 |
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cacheflush.h | File | 4.87 KB | 0644 |
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checksum.h | File | 1.35 KB | 0644 |
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clocksource.h | File | 192 B | 0644 |
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cmpxchg.h | File | 7.98 KB | 0644 |
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compat.h | File | 7.15 KB | 0644 |
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compiler.h | File | 1.18 KB | 0644 |
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cpu.h | File | 1.84 KB | 0644 |
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cpu_ops.h | File | 2.73 KB | 0644 |
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cpucaps.h | File | 1.87 KB | 0644 |
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cpufeature.h | File | 19.14 KB | 0644 |
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cpuidle.h | File | 401 B | 0644 |
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cputype.h | File | 8.1 KB | 0644 |
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current.h | File | 517 B | 0644 |
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daifflags.h | File | 1.59 KB | 0644 |
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dcc.h | File | 1.36 KB | 0644 |
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debug-monitors.h | File | 3.76 KB | 0644 |
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device.h | File | 886 B | 0644 |
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dma-mapping.h | File | 2.42 KB | 0644 |
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dmi.h | File | 850 B | 0644 |
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efi.h | File | 4.57 KB | 0644 |
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elf.h | File | 5.7 KB | 0644 |
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esr.h | File | 9.02 KB | 0644 |
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exception.h | File | 1.21 KB | 0644 |
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exec.h | File | 868 B | 0644 |
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extable.h | File | 815 B | 0644 |
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fb.h | File | 1000 B | 0644 |
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fixmap.h | File | 2.91 KB | 0644 |
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fpsimd.h | File | 4.21 KB | 0644 |
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fpsimdmacros.h | File | 5.62 KB | 0644 |
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ftrace.h | File | 1.92 KB | 0644 |
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futex.h | File | 3.41 KB | 0644 |
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hardirq.h | File | 2.08 KB | 0644 |
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hugetlb.h | File | 2.71 KB | 0644 |
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hw_breakpoint.h | File | 4.46 KB | 0644 |
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hwcap.h | File | 1.86 KB | 0644 |
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hypervisor.h | File | 144 B | 0644 |
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insn.h | File | 16.03 KB | 0644 |
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io.h | File | 7.72 KB | 0644 |
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irq.h | File | 307 B | 0644 |
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irq_work.h | File | 228 B | 0644 |
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irqflags.h | File | 2.3 KB | 0644 |
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jump_label.h | File | 1.68 KB | 0644 |
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kasan.h | File | 1.16 KB | 0644 |
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kernel-pgtable.h | File | 4.03 KB | 0644 |
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kexec.h | File | 2.42 KB | 0644 |
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kgdb.h | File | 3.79 KB | 0644 |
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kprobes.h | File | 1.74 KB | 0644 |
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kvm_arm.h | File | 8.38 KB | 0644 |
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kvm_asm.h | File | 4.26 KB | 0644 |
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kvm_coproc.h | File | 2.04 KB | 0644 |
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kvm_emulate.h | File | 10.38 KB | 0644 |
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kvm_host.h | File | 15.73 KB | 0644 |
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kvm_hyp.h | File | 5.79 KB | 0644 |
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kvm_mmio.h | File | 1.3 KB | 0644 |
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kvm_mmu.h | File | 11.72 KB | 0644 |
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linkage.h | File | 114 B | 0644 |
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lse.h | File | 1.26 KB | 0644 |
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memblock.h | File | 720 B | 0644 |
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memory.h | File | 9.16 KB | 0644 |
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mmu.h | File | 2.76 KB | 0644 |
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mmu_context.h | File | 6.35 KB | 0644 |
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mmzone.h | File | 266 B | 0644 |
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module.h | File | 2.8 KB | 0644 |
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neon.h | File | 815 B | 0644 |
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numa.h | File | 1.33 KB | 0644 |
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page-def.h | File | 1.17 KB | 0644 |
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page.h | File | 1.61 KB | 0644 |
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paravirt.h | File | 458 B | 0644 |
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pci.h | File | 878 B | 0644 |
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percpu.h | File | 7.48 KB | 0644 |
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perf_event.h | File | 3.17 KB | 0644 |
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pgalloc.h | File | 3.71 KB | 0644 |
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pgtable-hwdef.h | File | 9.4 KB | 0644 |
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pgtable-prot.h | File | 4.38 KB | 0644 |
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pgtable-types.h | File | 1.84 KB | 0644 |
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pgtable.h | File | 21.55 KB | 0644 |
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probes.h | File | 1022 B | 0644 |
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proc-fns.h | File | 1.21 KB | 0644 |
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processor.h | File | 6.52 KB | 0644 |
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ptdump.h | File | 1.42 KB | 0644 |
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ptrace.h | File | 9 KB | 0644 |
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sdei.h | File | 1.46 KB | 0644 |
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seccomp.h | File | 714 B | 0644 |
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sections.h | File | 1.46 KB | 0644 |
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shmparam.h | File | 965 B | 0644 |
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signal32.h | File | 1.45 KB | 0644 |
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simd.h | File | 1.39 KB | 0644 |
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smp.h | File | 4.23 KB | 0644 |
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smp_plat.h | File | 1.43 KB | 0644 |
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sparsemem.h | File | 771 B | 0644 |
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spinlock.h | File | 3.33 KB | 0644 |
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spinlock_types.h | File | 1.06 KB | 0644 |
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stack_pointer.h | File | 247 B | 0644 |
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stackprotector.h | File | 1.11 KB | 0644 |
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stacktrace.h | File | 2.53 KB | 0644 |
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stage2_pgtable-nopmd.h | File | 1.3 KB | 0644 |
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stage2_pgtable-nopud.h | File | 1.24 KB | 0644 |
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stage2_pgtable.h | File | 4.89 KB | 0644 |
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stat.h | File | 1.43 KB | 0644 |
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string.h | File | 2.33 KB | 0644 |
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suspend.h | File | 1.65 KB | 0644 |
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sync_bitops.h | File | 1.11 KB | 0644 |
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syscall.h | File | 2.87 KB | 0644 |
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sysreg.h | File | 25.1 KB | 0644 |
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system_misc.h | File | 1.86 KB | 0644 |
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thread_info.h | File | 3.93 KB | 0644 |
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timex.h | File | 883 B | 0644 |
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tlb.h | File | 2.22 KB | 0644 |
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tlbflush.h | File | 5.38 KB | 0644 |
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topology.h | File | 1.29 KB | 0644 |
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traps.h | File | 3.33 KB | 0644 |
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uaccess.h | File | 12.01 KB | 0644 |
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unistd.h | File | 1.6 KB | 0644 |
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unistd32.h | File | 27.53 KB | 0644 |
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uprobes.h | File | 777 B | 0644 |
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vdso.h | File | 1.09 KB | 0644 |
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vdso_datapage.h | File | 1.53 KB | 0644 |
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vectors.h | File | 1.75 KB | 0644 |
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virt.h | File | 3 KB | 0644 |
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vmap_stack.h | File | 769 B | 0644 |
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word-at-a-time.h | File | 2.22 KB | 0644 |
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