66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <asm/lib/bits.h>
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#include <asm/cpu.h>
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#include <asm/per_cpu.h>
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#include <softirq.h>
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static softirq_handler softirq_handlers[NR_SOFTIRQS];
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void init_softirq(void)
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{
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}
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/*
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* @pre: nr will not equal or large than NR_SOFTIRQS
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*/
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void register_softirq(uint16_t nr, softirq_handler handler)
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{
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softirq_handlers[nr] = handler;
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}
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/*
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* @pre: nr will not equal or large than NR_SOFTIRQS
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*/
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void fire_softirq(uint16_t nr)
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{
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bitmap_set_lock(nr, &per_cpu(softirq_pending, get_pcpu_id()));
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}
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static void do_softirq_internal(uint16_t cpu_id)
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{
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volatile uint64_t *softirq_pending_bitmap =
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&per_cpu(softirq_pending, cpu_id);
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uint16_t nr = ffs64(*softirq_pending_bitmap);
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while (nr < NR_SOFTIRQS) {
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bitmap_clear_lock(nr, softirq_pending_bitmap);
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(*softirq_handlers[nr])(cpu_id);
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nr = ffs64(*softirq_pending_bitmap);
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}
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}
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/*
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* @pre: this function will only be called with irq disabled
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*/
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void do_softirq(void)
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{
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uint16_t cpu_id = get_pcpu_id();
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if (per_cpu(softirq_servicing, cpu_id) == 0U) {
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per_cpu(softirq_servicing, cpu_id) = 1U;
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CPU_IRQ_ENABLE_ON_CONFIG();
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do_softirq_internal(cpu_id);
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CPU_IRQ_DISABLE_ON_CONFIG();
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do_softirq_internal(cpu_id);
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per_cpu(softirq_servicing, cpu_id) = 0U;
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}
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}
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