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/**
* @file
*
* @ingroup bsp_interrupt
*
* @brief Generic BSP interrupt server implementation.
*/
/*
* Copyright (c) 2009, 2010
* embedded brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <stdlib.h>
#include <rtems.h>
#include <rtems/chain.h>
#include <bsp/irq-generic.h>
#define BSP_INTERRUPT_EVENT RTEMS_EVENT_13
typedef struct bsp_interrupt_server_entry {
rtems_chain_node node;
rtems_vector_number vector;
rtems_interrupt_handler handler;
void *arg;
} bsp_interrupt_server_entry;
static rtems_id bsp_interrupt_server_id = RTEMS_ID_NONE;
static RTEMS_CHAIN_DEFINE_EMPTY(bsp_interrupt_server_chain);
static rtems_status_code bsp_interrupt_server_is_initialized(void)
{
if (bsp_interrupt_server_id != RTEMS_ID_NONE) {
return RTEMS_SUCCESSFUL;
} else {
return RTEMS_INCORRECT_STATE;
}
}
static unsigned bsp_interrupt_server_errors;
static void bsp_interrupt_server_trigger(void *arg)
{
bsp_interrupt_server_entry *e = arg;
bsp_interrupt_vector_disable(e->vector);
if (e->node.next == NULL) {
rtems_chain_append(&bsp_interrupt_server_chain, &e->node);
} else {
++bsp_interrupt_server_errors;
}
rtems_event_send(bsp_interrupt_server_id, BSP_INTERRUPT_EVENT);
}
static bsp_interrupt_server_entry *bsp_interrupt_server_get_entry(void)
{
rtems_interrupt_level level;
bsp_interrupt_server_entry *e;
rtems_interrupt_disable(level);
e = (bsp_interrupt_server_entry *)
rtems_chain_get_unprotected(&bsp_interrupt_server_chain);
if (e != NULL) {
e->node.next = NULL;
}
rtems_interrupt_enable(level);
return e;
}
static void bsp_interrupt_server_task(rtems_task_argument arg)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
while (true) {
rtems_event_set events = 0;
bsp_interrupt_server_entry *e = NULL;
sc = rtems_event_receive(
BSP_INTERRUPT_EVENT,
RTEMS_EVENT_ALL | RTEMS_WAIT,
RTEMS_NO_TIMEOUT,
&events
);
if (sc != RTEMS_SUCCESSFUL) {
break;
}
while ((e = bsp_interrupt_server_get_entry()) != NULL) {
(*e->handler)(e->arg);
bsp_interrupt_vector_enable(e->vector);
}
}
rtems_task_delete(RTEMS_SELF);
}
typedef struct {
rtems_interrupt_handler handler;
void *arg;
bsp_interrupt_server_entry *entry;
} bsp_interrupt_server_iterate_entry;
static void bsp_interrupt_server_per_handler_routine(
void *iterate_arg,
const char *info,
rtems_option options,
rtems_interrupt_handler handler,
void *handler_arg
)
{
bsp_interrupt_server_iterate_entry *ie = iterate_arg;
bsp_interrupt_server_entry *e = handler_arg;
if (handler == bsp_interrupt_server_trigger) {
if (e->handler == ie->handler && e->arg == ie->arg) {
ie->entry = e;
}
}
}
rtems_status_code rtems_interrupt_server_handler_install(
rtems_id server,
rtems_vector_number vector,
const char *info,
rtems_option options,
rtems_interrupt_handler handler,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
bsp_interrupt_server_entry *e = NULL;
sc = bsp_interrupt_server_is_initialized();
if (sc != RTEMS_SUCCESSFUL) {
return sc;
}
if (server != RTEMS_ID_NONE) {
return RTEMS_NOT_IMPLEMENTED;
}
if (RTEMS_INTERRUPT_IS_SHARED(options)) {
return RTEMS_NOT_IMPLEMENTED;
}
e = calloc(1, sizeof(*e));
if (e == NULL) {
return RTEMS_NO_MEMORY;
}
e->vector = vector;
e->handler = handler;
e->arg = arg;
sc = rtems_interrupt_handler_install(
vector,
info,
options,
bsp_interrupt_server_trigger,
e
);
if (sc != RTEMS_SUCCESSFUL) {
free(e);
return sc;
}
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_interrupt_server_handler_remove(
rtems_id server,
rtems_vector_number vector,
rtems_interrupt_handler handler,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
bsp_interrupt_server_iterate_entry ie = {
.handler = handler,
.arg = arg,
.entry = NULL
};
sc = bsp_interrupt_server_is_initialized();
if (sc != RTEMS_SUCCESSFUL) {
return sc;
}
if (server != RTEMS_ID_NONE) {
return RTEMS_NOT_IMPLEMENTED;
}
/* Query corresponding interrupt server entry */
sc = rtems_interrupt_handler_iterate(
vector,
bsp_interrupt_server_per_handler_routine,
&ie
);
if (sc != RTEMS_SUCCESSFUL) {
return sc;
} else if (ie.entry == NULL) {
return RTEMS_INVALID_ID;
}
sc = rtems_interrupt_handler_remove(
vector,
bsp_interrupt_server_trigger,
ie.entry
);
if (sc != RTEMS_SUCCESSFUL) {
return sc;
}
free(ie.entry);
return RTEMS_SUCCESSFUL;
}
rtems_status_code rtems_interrupt_server_initialize(
rtems_task_priority priority,
size_t stack_size,
rtems_mode modes,
rtems_attribute attributes,
rtems_id *server
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
if (server != NULL) {
return RTEMS_NOT_IMPLEMENTED;
}
sc = rtems_task_create(
rtems_build_name('I', 'R', 'Q', 'S'),
priority,
stack_size,
modes,
attributes,
&bsp_interrupt_server_id
);
if (sc != RTEMS_SUCCESSFUL) {
return RTEMS_TOO_MANY;
}
sc = rtems_task_start(
bsp_interrupt_server_id,
bsp_interrupt_server_task,
0
);
if (sc != RTEMS_SUCCESSFUL) {
/* In this case we could also panic */
rtems_task_delete(bsp_interrupt_server_id);
bsp_interrupt_server_id = RTEMS_ID_NONE;
return RTEMS_TOO_MANY;
}
return RTEMS_SUCCESSFUL;
}
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