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/*
* Copyright (c) 2018 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 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 <rtems/console.h>
#include <rtems/bspIo.h>
#include <rtems/imfs.h>
#include <rtems/thread.h>
#include "consolesimple.h"
#define CONSOLE_SIMPLE_TASK_BUFFER_SIZE 2048
#define CONSOLE_SIMPLE_TASK_MAX_JUNK_SIZE 80
typedef struct {
RTEMS_INTERRUPT_LOCK_MEMBER( buf_lock )
rtems_mutex output_mutex;
rtems_id task;
size_t head;
size_t tail;
char buf[ CONSOLE_SIMPLE_TASK_BUFFER_SIZE ];
} Console_simple_task_Control;
static Console_simple_task_Control _Console_simple_task_Instance;
static size_t _Console_simple_task_Capacity(
const Console_simple_task_Control *cons
)
{
return ( cons->tail - cons->head - 1 ) % CONSOLE_SIMPLE_TASK_BUFFER_SIZE;
}
static size_t _Console_simple_task_Available(
const Console_simple_task_Control *cons
)
{
return ( cons->head - cons->tail ) % CONSOLE_SIMPLE_TASK_BUFFER_SIZE;
}
static ssize_t _Console_simple_task_Write(
rtems_libio_t *iop,
const void *buffer,
size_t count
)
{
Console_simple_task_Control *cons;
const char *buf;
size_t todo;
cons = IMFS_generic_get_context_by_iop( iop );
buf = buffer;
todo = count;
while ( todo > 0 ) {
rtems_interrupt_lock_context lock_context;
size_t junk;
size_t head;
size_t i;
rtems_interrupt_lock_acquire( &cons->buf_lock, &lock_context );
junk = _Console_simple_task_Capacity( cons );
if ( junk > todo ) {
junk = todo;
}
if ( junk > CONSOLE_SIMPLE_TASK_MAX_JUNK_SIZE ) {
junk = CONSOLE_SIMPLE_TASK_MAX_JUNK_SIZE;
}
head = cons->head;
for ( i = 0; i < junk; ++i ) {
cons->buf[ head ] = *buf;
head = ( head + 1 ) % CONSOLE_SIMPLE_TASK_BUFFER_SIZE;
--todo;
++buf;
}
cons->head = head;
rtems_interrupt_lock_release( &cons->buf_lock, &lock_context );
if ( junk == 0 ) {
break;
}
}
rtems_event_system_send( cons->task, RTEMS_EVENT_SYSTEM_SERVER );
return (ssize_t) ( count - todo );
}
static void _Console_simple_task_Put_chars( Console_simple_task_Control *cons )
{
rtems_interrupt_lock_context lock_context;
size_t available;
size_t tail;
size_t i;
rtems_mutex_lock( &cons->output_mutex );
rtems_interrupt_lock_acquire( &cons->buf_lock, &lock_context );
available = _Console_simple_task_Available( cons );
tail = cons->tail;
rtems_interrupt_lock_release( &cons->buf_lock, &lock_context );
for ( i = 0; i < available; ++i) {
rtems_putc( cons->buf[ tail ] );
tail = ( tail + 1 ) % CONSOLE_SIMPLE_TASK_BUFFER_SIZE;
}
rtems_interrupt_lock_acquire( &cons->buf_lock, &lock_context );
cons->tail = tail;
rtems_interrupt_lock_release( &cons->buf_lock, &lock_context );
rtems_mutex_unlock( &cons->output_mutex );
}
static int _Console_simple_task_Fsync( rtems_libio_t *iop )
{
Console_simple_task_Control *cons;
cons = IMFS_generic_get_context_by_iop( iop );
_Console_simple_task_Put_chars( cons );
return 0;
}
static const rtems_filesystem_file_handlers_r _Console_simple_task_Handlers = {
.open_h = rtems_filesystem_default_open,
.close_h = rtems_filesystem_default_close,
.read_h = _Console_simple_Read,
.write_h = _Console_simple_task_Write,
.ioctl_h = rtems_filesystem_default_ioctl,
.lseek_h = rtems_filesystem_default_lseek,
.fstat_h = IMFS_stat,
.ftruncate_h = rtems_filesystem_default_ftruncate,
.fsync_h = _Console_simple_task_Fsync,
.fdatasync_h = _Console_simple_task_Fsync,
.fcntl_h = rtems_filesystem_default_fcntl,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev,
.mmap_h = rtems_filesystem_default_mmap
};
static const IMFS_node_control
_Console_simple_task_Node_control = IMFS_GENERIC_INITIALIZER(
&_Console_simple_task_Handlers,
IMFS_node_initialize_generic,
IMFS_node_destroy_default
);
static void _Console_simple_task_Task( rtems_task_argument arg )
{
Console_simple_task_Control *cons;
cons = (Console_simple_task_Control *) arg;
while ( true ) {
rtems_event_set events;
rtems_event_system_receive(
RTEMS_EVENT_SYSTEM_SERVER,
RTEMS_WAIT | RTEMS_EVENT_ALL,
RTEMS_NO_TIMEOUT,
&events
);
_Console_simple_task_Put_chars( cons );
}
}
void _Console_simple_task_Initialize( void )
{
Console_simple_task_Control *cons;
cons = &_Console_simple_task_Instance;
rtems_interrupt_lock_initialize( &cons->buf_lock, "Console" );
rtems_mutex_init( &cons->output_mutex, "Console" );
IMFS_make_generic_node(
CONSOLE_DEVICE_NAME,
S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO,
&_Console_simple_task_Node_control,
cons
);
rtems_task_create(
rtems_build_name('C', 'O', 'N', 'S'),
RTEMS_MAXIMUM_PRIORITY - 1,
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_ATTRIBUTES,
RTEMS_DEFAULT_MODES,
&cons->task
);
rtems_task_start(
cons->task,
_Console_simple_task_Task,
(rtems_task_argument) cons
);
}
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