512a0200de
All the kernel header files now use pargma once rather than the ifndef, as the pre-processed C files do not change while header files are protected with pargma once. This will also solve any naming issues caused by ifndef.
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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* Copyright 2020, Data61, CSIRO (ABN 41 687 119 230)
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#pragma once
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#include <config.h>
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#include <mode/smp/smp.h>
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#include <model/smp.h>
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#ifdef ENABLE_SMP_SUPPORT
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static inline cpu_id_t cpuIndexToID(word_t index)
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{
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return BIT(index);
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}
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static inline bool_t try_arch_atomic_exchange(void *ptr, void *new_val, void **prev, int success_memorder,
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int failure_memorder)
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{
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uint32_t atomic_status;
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void *temp;
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asm volatile(
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LD_EX "%[prev_output], [%[ptr_val]] \n\t" /* ret = *ptr */
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ST_EX "%" OP_WIDTH "[atomic_var], %[new_val] , [%[ptr_val]] \n\t" /* *ptr = new */
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: [atomic_var] "=&r"(atomic_status), [prev_output]"=&r"(temp) /* output */
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: [ptr_val] "r"(ptr), [new_val] "r"(new_val) /* input */
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:
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);
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*prev = temp;
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/* Atomic operation success */
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if (likely(!atomic_status)) {
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__atomic_thread_fence(success_memorder);
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} else {
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/* Atomic operation failure */
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__atomic_thread_fence(failure_memorder);
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}
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/* On ARM if an atomic operation succeeds, it returns 0 */
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return (atomic_status == 0);
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}
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#endif /* ENABLE_SMP_SUPPORT */
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