3b141d9c80
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20140 a1c6a512-1295-4272-9138-f99709370657
292 lines
11 KiB
C
292 lines
11 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Björn Stenberg
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _KERNEL_H_
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#define _KERNEL_H_
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#include <stdbool.h>
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#include <inttypes.h>
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#include "config.h"
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#include "thread.h"
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/* wrap-safe macros for tick comparison */
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#define TIME_AFTER(a,b) ((long)(b) - (long)(a) < 0)
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#define TIME_BEFORE(a,b) TIME_AFTER(b,a)
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#define HZ 100 /* number of ticks per second */
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#define MAX_NUM_TICK_TASKS 8
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#define MAX_NUM_QUEUES 32
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#define QUEUE_LENGTH 16 /* MUST be a power of 2 */
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#define QUEUE_LENGTH_MASK (QUEUE_LENGTH - 1)
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/* System defined message ID's - |sign bit = 1|class|id| */
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/* Event class list */
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#define SYS_EVENT_CLS_QUEUE 0
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#define SYS_EVENT_CLS_USB 1
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#define SYS_EVENT_CLS_POWER 2
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#define SYS_EVENT_CLS_FILESYS 3
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#define SYS_EVENT_CLS_PLUG 4
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#define SYS_EVENT_CLS_MISC 5
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#define SYS_EVENT_CLS_PRIVATE 7 /* For use inside plugins */
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/* make sure SYS_EVENT_CLS_BITS has enough range */
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/* Bit 31->|S|c...c|i...i| */
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#define SYS_EVENT ((long)(int)(1 << 31))
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#define SYS_EVENT_CLS_BITS (3)
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#define SYS_EVENT_CLS_SHIFT (31-SYS_EVENT_CLS_BITS)
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#define SYS_EVENT_CLS_MASK (((1l << SYS_EVENT_CLS_BITS)-1) << SYS_EVENT_SHIFT)
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#define MAKE_SYS_EVENT(cls, id) (SYS_EVENT | ((long)(cls) << SYS_EVENT_CLS_SHIFT) | (long)(id))
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/* Macros for extracting codes */
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#define SYS_EVENT_CLS(e) (((e) & SYS_EVENT_CLS_MASK) >> SYS_EVENT_SHIFT)
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#define SYS_EVENT_ID(e) ((e) & ~(SYS_EVENT|SYS_EVENT_CLS_MASK))
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#define SYS_TIMEOUT MAKE_SYS_EVENT(SYS_EVENT_CLS_QUEUE, 0)
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#define SYS_USB_CONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 0)
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#define SYS_USB_CONNECTED_ACK MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 1)
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#define SYS_USB_DISCONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 2)
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#define SYS_USB_DISCONNECTED_ACK MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 3)
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#define SYS_USB_LUN_LOCKED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 4)
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#define SYS_USB_READ_DATA MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 5)
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#define SYS_USB_WRITE_DATA MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 6)
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#define SYS_POWEROFF MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 0)
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#define SYS_CHARGER_CONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 1)
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#define SYS_CHARGER_DISCONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 2)
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#define SYS_BATTERY_UPDATE MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 3)
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#define SYS_FS_CHANGED MAKE_SYS_EVENT(SYS_EVENT_CLS_FILESYS, 0)
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#define SYS_HOTSWAP_INSERTED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 0)
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#define SYS_HOTSWAP_EXTRACTED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 1)
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#define SYS_PHONE_PLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 2)
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#define SYS_PHONE_UNPLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 3)
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#define SYS_REMOTE_PLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 4)
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#define SYS_REMOTE_UNPLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 5)
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#define SYS_CAR_ADAPTER_RESUME MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 0)
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#define SYS_IAP_PERIODIC MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 1)
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#define SYS_IAP_HANDLEPKT MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 2)
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#define IS_SYSEVENT(ev) ((ev & SYS_EVENT) == SYS_EVENT)
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#ifndef TIMEOUT_BLOCK
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#define TIMEOUT_BLOCK -1
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#define TIMEOUT_NOBLOCK 0
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#endif
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struct queue_event
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{
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long id;
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intptr_t data;
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};
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#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
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struct queue_sender_list
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{
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/* If non-NULL, there is a thread waiting for the corresponding event */
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/* Must be statically allocated to put in non-cached ram. */
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struct thread_entry *senders[QUEUE_LENGTH]; /* message->thread map */
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struct thread_entry *list; /* list of senders in map */
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/* Send info for last message dequeued or NULL if replied or not sent */
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struct thread_entry *curr_sender;
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#ifdef HAVE_PRIORITY_SCHEDULING
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struct blocker blocker;
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#endif
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};
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#endif /* HAVE_EXTENDED_MESSAGING_AND_NAME */
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#ifdef HAVE_PRIORITY_SCHEDULING
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#define QUEUE_GET_THREAD(q) \
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(((q)->send == NULL) ? NULL : (q)->send->blocker.thread)
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#else
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/* Queue without priority enabled have no owner provision _at this time_ */
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#define QUEUE_GET_THREAD(q) \
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(NULL)
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#endif
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struct event_queue
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{
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struct thread_entry *queue; /* waiter list */
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struct queue_event events[QUEUE_LENGTH]; /* list of events */
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unsigned int read; /* head of queue */
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unsigned int write; /* tail of queue */
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#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
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struct queue_sender_list *send; /* list of threads waiting for
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reply to an event */
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#ifdef HAVE_PRIORITY_SCHEDULING
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struct blocker *blocker_p; /* priority inheritance info
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for sync message senders */
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#endif
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#endif
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IF_COP( struct corelock cl; ) /* multiprocessor sync */
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};
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#ifdef HAVE_PRIORITY_SCHEDULING
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#define MUTEX_SET_THREAD(m, t) ((m)->blocker.thread = (t))
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#define MUTEX_GET_THREAD(m) ((m)->blocker.thread)
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#else
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#define MUTEX_SET_THREAD(m, t) ((m)->thread = (t))
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#define MUTEX_GET_THREAD(m) ((m)->thread)
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#endif
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struct mutex
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{
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struct thread_entry *queue; /* waiter list */
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int count; /* lock owner recursion count */
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#ifdef HAVE_PRIORITY_SCHEDULING
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struct blocker blocker; /* priority inheritance info
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for waiters */
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bool no_preempt; /* don't allow higher-priority thread
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to be scheduled even if woken */
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#else
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struct thread_entry *thread;
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#endif
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IF_COP( struct corelock cl; ) /* multiprocessor sync */
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unsigned char locked; /* locked semaphore */
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};
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#ifdef HAVE_SEMAPHORE_OBJECTS
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struct semaphore
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{
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struct thread_entry *queue; /* Waiter list */
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int count; /* # of waits remaining before unsignaled */
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int max; /* maximum # of waits to remain signaled */
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IF_COP( struct corelock cl; ) /* multiprocessor sync */
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};
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#endif
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#ifdef HAVE_WAKEUP_OBJECTS
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struct wakeup
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{
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struct thread_entry *queue; /* waiter list */
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unsigned char signalled; /* signalled status */
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IF_COP( struct corelock cl; ) /* multiprocessor sync */
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};
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#endif
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/* global tick variable */
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#if defined(CPU_PP) && defined(BOOTLOADER)
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/* We don't enable interrupts in the iPod bootloader, so we need to fake
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the current_tick variable */
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#define current_tick (signed)(USEC_TIMER/10000)
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static inline void call_tick_tasks(void)
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{
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}
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#else
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extern volatile long current_tick;
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/* inline helper for implementing target interrupt handler */
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static inline void call_tick_tasks(void)
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{
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extern void (*tick_funcs[MAX_NUM_TICK_TASKS+1])(void);
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void (**p)(void) = tick_funcs;
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void (*fn)(void);
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current_tick++;
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for(fn = *p; fn != NULL; fn = *(++p))
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{
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fn();
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}
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}
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#endif
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#if defined(SIMULATOR) && !defined(PLUGIN) && !defined(CODEC)
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#define sleep(x) sim_sleep(x)
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#endif
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/* kernel functions */
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extern void kernel_init(void);
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extern void yield(void);
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extern void sleep(int ticks);
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int tick_add_task(void (*f)(void));
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int tick_remove_task(void (*f)(void));
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extern void tick_start(unsigned int interval_in_ms);
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struct timeout;
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/* timeout callback type
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* tmo - pointer to struct timeout associated with event
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* return next interval or <= 0 to stop event
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*/
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#define MAX_NUM_TIMEOUTS 8
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typedef int (* timeout_cb_type)(struct timeout *tmo);
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struct timeout
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{
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timeout_cb_type callback;/* callback - returning false cancels */
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intptr_t data; /* data passed to callback */
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long expires; /* expiration tick */
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};
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void timeout_register(struct timeout *tmo, timeout_cb_type callback,
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int ticks, intptr_t data);
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void timeout_cancel(struct timeout *tmo);
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#define STATE_NONSIGNALED 0
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#define STATE_SIGNALED 1
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#define OBJ_WAIT_TIMEDOUT (-1)
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#define OBJ_WAIT_FAILED 0
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#define OBJ_WAIT_SUCCEEDED 1
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extern void queue_init(struct event_queue *q, bool register_queue);
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extern void queue_delete(struct event_queue *q);
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extern void queue_wait(struct event_queue *q, struct queue_event *ev);
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extern void queue_wait_w_tmo(struct event_queue *q, struct queue_event *ev,
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int ticks);
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extern void queue_post(struct event_queue *q, long id, intptr_t data);
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#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
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extern void queue_enable_queue_send(struct event_queue *q,
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struct queue_sender_list *send,
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unsigned int owner_id);
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extern intptr_t queue_send(struct event_queue *q, long id, intptr_t data);
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extern void queue_reply(struct event_queue *q, intptr_t retval);
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extern bool queue_in_queue_send(struct event_queue *q);
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#endif /* HAVE_EXTENDED_MESSAGING_AND_NAME */
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extern bool queue_empty(const struct event_queue* q);
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extern bool queue_peek(struct event_queue *q, struct queue_event *ev);
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extern void queue_clear(struct event_queue* q);
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extern void queue_remove_from_head(struct event_queue *q, long id);
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extern int queue_count(const struct event_queue *q);
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extern int queue_broadcast(long id, intptr_t data);
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extern void mutex_init(struct mutex *m);
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extern void mutex_lock(struct mutex *m);
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extern void mutex_unlock(struct mutex *m);
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#ifdef HAVE_PRIORITY_SCHEDULING
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/* Temporary function to disable mutex preempting a thread on unlock */
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static inline void mutex_set_preempt(struct mutex *m, bool preempt)
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{ m->no_preempt = !preempt; }
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#endif
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#ifdef HAVE_SEMAPHORE_OBJECTS
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extern void semaphore_init(struct semaphore *s, int max, int start);
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extern void semaphore_wait(struct semaphore *s);
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extern void semaphore_release(struct semaphore *s);
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#endif /* HAVE_SEMAPHORE_OBJECTS */
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#ifdef HAVE_WAKEUP_OBJECTS
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extern void wakeup_init(struct wakeup *w);
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extern int wakeup_wait(struct wakeup *w, int timeout);
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extern int wakeup_signal(struct wakeup *w);
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#endif /* HAVE_WAKEUP_OBJECTS */
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#endif /* _KERNEL_H_ */
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