summaryrefslogtreecommitdiffstats
path: root/firmware/export/kernel.h
blob: 78403c8b7de3ac238f30b37011de9c11591f0d82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
/***************************************************************************
 *             __________               __   ___.
 *   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)

#define IS_SYSEVENT(ev)           ((ev & SYS_EVENT) == SYS_EVENT)

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]; /* message->thread map */
    struct thread_entry *list;                  /* list of senders in map */
    /* Send info for last message dequeued or NULL if replied or not sent */
    struct thread_entry *curr_sender;
#ifdef HAVE_PRIORITY_SCHEDULING
    struct blocker blocker;
#endif
};
#endif /* HAVE_EXTENDED_MESSAGING_AND_NAME */

#ifdef HAVE_PRIORITY_SCHEDULING
#define QUEUE_GET_THREAD(q) \
    (((q)->send == NULL) ? NULL : (q)->send->blocker.thread)
#else
/* Queue without priority enabled have no owner provision _at this time_ */
#define QUEUE_GET_THREAD(q) \
    (NULL)
#endif

struct event_queue
{
    struct thread_entry *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 */
#ifdef HAVE_PRIORITY_SCHEDULING
    struct blocker *blocker_p;          /* priority inheritance info
                                           for sync message senders */
#endif
#endif
    IF_COP( struct corelock cl; )       /* multiprocessor sync */
};

#ifdef HAVE_PRIORITY_SCHEDULING
#define MUTEX_SET_THREAD(m, t) ((m)->blocker.thread = (t))
#define MUTEX_GET_THREAD(m)    ((m)->blocker.thread)
#else
#define MUTEX_SET_THREAD(m, t) ((m)->thread = (t))
#define MUTEX_GET_THREAD(m)    ((m)->thread)
#endif

struct mutex
{
    struct thread_entry *queue;         /* waiter list */
    int count;                          /* lock owner recursion count */
#ifdef HAVE_PRIORITY_SCHEDULING
    struct blocker blocker;             /* priority inheritance info
                                           for waiters */
    bool no_preempt;                    /* don't allow higher-priority thread
                                           to be scheduled even if woken */
#else
    struct thread_entry *thread;
#endif
    IF_COP( struct corelock cl; )       /* multiprocessor sync */
    unsigned char locked;               /* locked semaphore */
};

#if NUM_CORES > 1
struct spinlock
{
    struct thread_entry *thread;        /* lock owner */
    int count;                          /* lock owner recursion count */
    struct corelock cl;                 /* multiprocessor sync */
};
#endif

#ifdef HAVE_SEMAPHORE_OBJECTS
struct semaphore
{
    struct thread_entry *queue;         /* Waiter list */
    int count;                          /* # of waits remaining before unsignaled */
    int max;                            /* maximum # of waits to remain signaled */
    IF_COP( struct corelock cl; )       /* multiprocessor sync */
};
#endif

#ifdef HAVE_EVENT_OBJECTS
struct event
{
    struct thread_entry *queues[2];     /* waiters for each state */
    unsigned char automatic;            /* event performs auto-reset */
    unsigned char state;                /* state: 1 = signaled */
    IF_COP( struct corelock cl; )       /* multiprocessor sync */
};
#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,
                                    struct thread_entry *owner);
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);
#ifdef HAVE_PRIORITY_SCHEDULING
/* Temporary function to disable mutex preempting a thread on unlock */
static inline void mutex_set_preempt(struct mutex *m, bool preempt)
    { m->no_preempt = !preempt; }
#endif
#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 */

#endif /* _KERNEL_H_ */