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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef _KERNEL_H_
#define _KERNEL_H_
#include <stdbool.h>
#include <inttypes.h>
#include "config.h"
#include "thread.h"
/* wrap-safe macros for tick comparison */
#define TIME_AFTER(a,b) ((long)(b) - (long)(a) < 0)
#define TIME_BEFORE(a,b) TIME_AFTER(b,a)
#define HZ 100 /* number of ticks per second */
#define MAX_NUM_TICK_TASKS 8
#define MAX_NUM_QUEUES 32
#define QUEUE_LENGTH 16 /* MUST be a power of 2 */
#define QUEUE_LENGTH_MASK (QUEUE_LENGTH - 1)
/* System defined message ID's - |sign bit = 1|class|id| */
/* Event class list */
#define SYS_EVENT_CLS_QUEUE 0
#define SYS_EVENT_CLS_USB 1
#define SYS_EVENT_CLS_POWER 2
#define SYS_EVENT_CLS_FILESYS 3
#define SYS_EVENT_CLS_PLUG 4
#define SYS_EVENT_CLS_MISC 5
/* make sure SYS_EVENT_CLS_BITS has enough range */
/* Bit 31->|S|c...c|i...i| */
#define SYS_EVENT ((long)(int)(1 << 31))
#define SYS_EVENT_CLS_BITS (3)
#define SYS_EVENT_CLS_SHIFT (31-SYS_EVENT_CLS_BITS)
#define SYS_EVENT_CLS_MASK (((1l << SYS_EVENT_CLS_BITS)-1) << SYS_EVENT_SHIFT)
#define MAKE_SYS_EVENT(cls, id) (SYS_EVENT | ((long)(cls) << SYS_EVENT_CLS_SHIFT) | (long)(id))
/* Macros for extracting codes */
#define SYS_EVENT_CLS(e) (((e) & SYS_EVENT_CLS_MASK) >> SYS_EVENT_SHIFT)
#define SYS_EVENT_ID(e) ((e) & ~(SYS_EVENT|SYS_EVENT_CLS_MASK))
#define SYS_TIMEOUT MAKE_SYS_EVENT(SYS_EVENT_CLS_QUEUE, 0)
#define SYS_USB_CONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 0)
#define SYS_USB_CONNECTED_ACK MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 1)
#define SYS_USB_DISCONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 2)
#define SYS_USB_DISCONNECTED_ACK MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 3)
#define SYS_POWEROFF MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 0)
#define SYS_CHARGER_CONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 1)
#define SYS_CHARGER_DISCONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 2)
#define SYS_BATTERY_UPDATE MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 3)
#define SYS_FS_CHANGED MAKE_SYS_EVENT(SYS_EVENT_CLS_FILESYS, 0)
#define SYS_HOTSWAP_INSERTED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 0)
#define SYS_HOTSWAP_EXTRACTED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 1)
#define SYS_PHONE_PLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 2)
#define SYS_PHONE_UNPLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 3)
#define SYS_REMOTE_PLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 4)
#define SYS_REMOTE_UNPLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 5)
#define SYS_SCREENDUMP MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 0)
#define SYS_CAR_ADAPTER_RESUME MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 1)
struct queue_event
{
long id;
intptr_t data;
};
#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
struct queue_sender_list
{
/* If non-NULL, there is a thread waiting for the corresponding event */
/* Must be statically allocated to put in non-cached ram. */
struct thread_entry *senders[QUEUE_LENGTH];
/* Send info for last message dequeued or NULL if replied or not sent */
struct thread_entry *curr_sender;
};
#endif /* HAVE_EXTENDED_MESSAGING_AND_NAME */
struct event_queue
{
struct thread_queue queue; /* Waiter list */
struct queue_event events[QUEUE_LENGTH]; /* list of events */
unsigned int read; /* head of queue */
unsigned int write; /* tail of queue */
#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
struct queue_sender_list *send; /* list of threads waiting for
reply to an event */
#endif
#if NUM_CORES > 1
struct corelock cl; /* inter-core sync */
#endif
};
struct mutex
{
struct thread_entry *queue; /* Waiter list */
#if CONFIG_CORELOCK == SW_CORELOCK
struct corelock cl; /* inter-core sync */
#endif
struct thread_entry *thread; /* thread that owns lock */
int count; /* lock owner recursion count */
unsigned char locked; /* locked semaphore */
};
#if NUM_CORES > 1
struct spinlock
{
struct corelock cl; /* inter-core sync */
struct thread_entry *thread; /* lock owner */
int count; /* lock owner recursion count */
};
#endif
#ifdef HAVE_SEMAPHORE_OBJECTS
struct semaphore
{
struct thread_entry *queue; /* Waiter list */
#if CONFIG_CORELOCK == SW_CORELOCK
struct corelock cl; /* inter-core sync */
#endif
int count; /* # of waits remaining before unsignaled */
int max; /* maximum # of waits to remain signaled */
};
#endif
#ifdef HAVE_EVENT_OBJECTS
struct event
{
struct thread_entry *queues[2]; /* waiters for each state */
#if CONFIG_CORELOCK == SW_CORELOCK
struct corelock cl; /* inter-core sync */
#endif
unsigned char automatic; /* event performs auto-reset */
unsigned char state; /* state: 1 = signaled */
};
#endif
/* global tick variable */
#if defined(CPU_PP) && defined(BOOTLOADER)
/* We don't enable interrupts in the iPod bootloader, so we need to fake
the current_tick variable */
#define current_tick (signed)(USEC_TIMER/10000)
#else
extern volatile long current_tick;
#endif
#ifdef SIMULATOR
#define sleep(x) sim_sleep(x)
#endif
/* kernel functions */
extern void kernel_init(void);
extern void yield(void);
extern void sleep(int ticks);
int tick_add_task(void (*f)(void));
int tick_remove_task(void (*f)(void));
extern void tick_start(unsigned int interval_in_ms);
struct timeout;
/* timeout callback type
* tmo - pointer to struct timeout associated with event
*/
typedef bool (* timeout_cb_type)(struct timeout *tmo);
struct timeout
{
/* for use by callback/internal - read/write */
timeout_cb_type callback;/* callback - returning false cancels */
int ticks; /* timeout period in ticks */
intptr_t data; /* data passed to callback */
/* internal use - read-only */
const struct timeout * const next; /* next timeout in list */
const long expires; /* expiration tick */
};
void timeout_register(struct timeout *tmo, timeout_cb_type callback,
int ticks, intptr_t data);
void timeout_cancel(struct timeout *tmo);
#define STATE_NONSIGNALED 0
#define STATE_SIGNALED 1
#define WAIT_TIMEDOUT (-1)
#define WAIT_SUCCEEDED 1
extern void queue_init(struct event_queue *q, bool register_queue);
extern void queue_delete(struct event_queue *q);
extern void queue_wait(struct event_queue *q, struct queue_event *ev);
extern void queue_wait_w_tmo(struct event_queue *q, struct queue_event *ev,
int ticks);
extern void queue_post(struct event_queue *q, long id, intptr_t data);
#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
extern void queue_enable_queue_send(struct event_queue *q, struct queue_sender_list *send);
extern intptr_t queue_send(struct event_queue *q, long id, intptr_t data);
extern void queue_reply(struct event_queue *q, intptr_t retval);
extern bool queue_in_queue_send(struct event_queue *q);
#endif /* HAVE_EXTENDED_MESSAGING_AND_NAME */
extern bool queue_empty(const struct event_queue* q);
extern bool queue_peek(struct event_queue *q, struct queue_event *ev);
extern void queue_clear(struct event_queue* q);
extern void queue_remove_from_head(struct event_queue *q, long id);
extern int queue_count(const struct event_queue *q);
extern int queue_broadcast(long id, intptr_t data);
extern void mutex_init(struct mutex *m);
extern void mutex_lock(struct mutex *m);
extern void mutex_unlock(struct mutex *m);
#if NUM_CORES > 1
extern void spinlock_init(struct spinlock *l);
extern void spinlock_lock(struct spinlock *l);
extern void spinlock_unlock(struct spinlock *l);
#endif
#ifdef HAVE_SEMAPHORE_OBJECTS
extern void semaphore_init(struct semaphore *s, int max, int start);
extern void semaphore_wait(struct semaphore *s);
extern void semaphore_release(struct semaphore *s);
#endif /* HAVE_SEMAPHORE_OBJECTS */
#ifdef HAVE_EVENT_OBJECTS
#define EVENT_AUTOMATIC 0x10
#define EVENT_MANUAL 0x00
extern void event_init(struct event *e, unsigned int flags);
extern void event_wait(struct event *e, unsigned int for_state);
extern void event_set_state(struct event *e, unsigned int state);
#endif /* HAVE_EVENT_OBJECTS */
#define IS_SYSEVENT(ev) ((ev & SYS_EVENT) == SYS_EVENT)
#endif /* _KERNEL_H_ */
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