nes-proj/cpu/x86/drivers/legacy_pc/shared-isr.c

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