108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
/*
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* Copyright (C) 2016, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include "idt.h"
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#include "interrupt.h"
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#include "pic.h"
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#include "shared-isr.h"
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/* Defined in linker script */
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extern shared_isr_client_t _sdata_shared_isr, _edata_shared_isr;
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static void __attribute__((used))
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shared_handler(void)
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{
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shared_isr_client_t *client;
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for(client = &_sdata_shared_isr; client < &_edata_shared_isr; client++) {
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if(client->handler()) {
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pic_eoi(client->irq);
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return;
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}
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}
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}
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/**
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* \brief Initialize shared ISR by iterating through all of its clients and
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* configuring their interrupts to route to the shared ISR.
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*/
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void
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shared_isr_init(void)
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{
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shared_isr_client_t *client = &_sdata_shared_isr;
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shared_isr_client_t *consistency_check_client;
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bool prev_conf;
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void shared_isr_stub(void);
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__asm__ __volatile__ (
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ISR_STUB("shared_isr_stub", 0, "shared_handler")
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);
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while(client < &_edata_shared_isr) {
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consistency_check_client = &_sdata_shared_isr;
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prev_conf = false;
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while(consistency_check_client < client) {
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if((client->irq == consistency_check_client->irq) ||
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(client->pin == consistency_check_client->pin) ||
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(client->pirq == consistency_check_client->pirq)) {
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prev_conf = true;
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/* This interrupt was previously configured. */
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break;
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}
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consistency_check_client++;
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}
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if(prev_conf) {
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/* The requested configurations for each IRQ must be consistent. */
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assert((client->irq == consistency_check_client->irq) &&
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(client->agent == consistency_check_client->agent) &&
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(client->pin == consistency_check_client->pin) &&
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(client->pirq == consistency_check_client->pirq));
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} else {
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idt_set_intr_gate_desc(PIC_INT(client->irq), (uint32_t)shared_isr_stub);
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assert(pci_irq_agent_set_pirq(client->agent,
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client->pin,
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client->pirq) == 0);
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pci_pirq_set_irq(client->pirq, client->irq, 1);
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pic_unmask_irq(client->irq);
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}
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client++;
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}
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}
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