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author | Michael Sevakis <jethead71@rockbox.org> | 2010-06-02 12:45:36 +0000 |
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committer | Michael Sevakis <jethead71@rockbox.org> | 2010-06-02 12:45:36 +0000 |
commit | 555ad6710fd897bfc12549197b606c90b06000b4 (patch) | |
tree | f0c578888b88e29260793f083361b6d2fd4c2d93 /firmware/target/coldfire | |
parent | 6ebe76c147b00d2decd9501ad45ab7fd6db5b9c0 (diff) | |
download | rockbox-555ad6710fd897bfc12549197b606c90b06000b4.tar.gz rockbox-555ad6710fd897bfc12549197b606c90b06000b4.zip |
Threading: Split processor support code into respective target files. C files from /target/xxx are included into thread.c because of essential inlining and files are code, not declarations. Copyrights in each new file go to whoever implemented the first functional support.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26479 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/coldfire')
-rw-r--r-- | firmware/target/coldfire/thread-coldfire.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/firmware/target/coldfire/thread-coldfire.c b/firmware/target/coldfire/thread-coldfire.c new file mode 100644 index 0000000000..f151a971c7 --- /dev/null +++ b/firmware/target/coldfire/thread-coldfire.c | |||
@@ -0,0 +1,97 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2004 by Linus Nielsen Feltzing | ||
11 | * | ||
12 | * Coldfire processor threading support | ||
13 | * | ||
14 | * This program is free software; you can redistribute it and/or | ||
15 | * modify it under the terms of the GNU General Public License | ||
16 | * as published by the Free Software Foundation; either version 2 | ||
17 | * of the License, or (at your option) any later version. | ||
18 | * | ||
19 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
20 | * KIND, either express or implied. | ||
21 | * | ||
22 | ****************************************************************************/ | ||
23 | |||
24 | /*--------------------------------------------------------------------------- | ||
25 | * Start the thread running and terminate it if it returns | ||
26 | *--------------------------------------------------------------------------- | ||
27 | */ | ||
28 | void start_thread(void); /* Provide C access to ASM label */ | ||
29 | static void __attribute__((used)) __start_thread(void) | ||
30 | { | ||
31 | /* a0=macsr, a1=context */ | ||
32 | asm volatile ( | ||
33 | "start_thread: \n" /* Start here - no naked attribute */ | ||
34 | "move.l %a0, %macsr \n" /* Set initial mac status reg */ | ||
35 | "lea.l 48(%a1), %a1 \n" | ||
36 | "move.l (%a1)+, %sp \n" /* Set initial stack */ | ||
37 | "move.l (%a1), %a2 \n" /* Fetch thread function pointer */ | ||
38 | "clr.l (%a1) \n" /* Mark thread running */ | ||
39 | "jsr (%a2) \n" /* Call thread function */ | ||
40 | ); | ||
41 | thread_exit(); | ||
42 | } | ||
43 | |||
44 | /* Set EMAC unit to fractional mode with saturation for each new thread, | ||
45 | * since that's what'll be the most useful for most things which the dsp | ||
46 | * will do. Codecs should still initialize their preferred modes | ||
47 | * explicitly. Context pointer is placed in d2 slot and start_thread | ||
48 | * pointer in d3 slot. thread function pointer is placed in context.start. | ||
49 | * See load_context for what happens when thread is initially going to | ||
50 | * run. | ||
51 | */ | ||
52 | #define THREAD_STARTUP_INIT(core, thread, function) \ | ||
53 | ({ (thread)->context.macsr = EMAC_FRACTIONAL | EMAC_SATURATE, \ | ||
54 | (thread)->context.d[0] = (uint32_t)&(thread)->context, \ | ||
55 | (thread)->context.d[1] = (uint32_t)start_thread, \ | ||
56 | (thread)->context.start = (uint32_t)(function); }) | ||
57 | |||
58 | /*--------------------------------------------------------------------------- | ||
59 | * Store non-volatile context. | ||
60 | *--------------------------------------------------------------------------- | ||
61 | */ | ||
62 | static inline void store_context(void* addr) | ||
63 | { | ||
64 | asm volatile ( | ||
65 | "move.l %%macsr,%%d0 \n" | ||
66 | "movem.l %%d0/%%d2-%%d7/%%a2-%%a7,(%0) \n" | ||
67 | : : "a" (addr) : "d0" /* only! */ | ||
68 | ); | ||
69 | } | ||
70 | |||
71 | /*--------------------------------------------------------------------------- | ||
72 | * Load non-volatile context. | ||
73 | *--------------------------------------------------------------------------- | ||
74 | */ | ||
75 | static inline void load_context(const void* addr) | ||
76 | { | ||
77 | asm volatile ( | ||
78 | "move.l 52(%0), %%d0 \n" /* Get start address */ | ||
79 | "beq.b 1f \n" /* NULL -> already running */ | ||
80 | "movem.l (%0), %%a0-%%a2 \n" /* a0=macsr, a1=context, a2=start_thread */ | ||
81 | "jmp (%%a2) \n" /* Start the thread */ | ||
82 | "1: \n" | ||
83 | "movem.l (%0), %%d0/%%d2-%%d7/%%a2-%%a7 \n" /* Load context */ | ||
84 | "move.l %%d0, %%macsr \n" | ||
85 | : : "a" (addr) : "d0" /* only! */ | ||
86 | ); | ||
87 | } | ||
88 | |||
89 | /*--------------------------------------------------------------------------- | ||
90 | * Put core in a power-saving state if waking list wasn't repopulated. | ||
91 | *--------------------------------------------------------------------------- | ||
92 | */ | ||
93 | static inline void core_sleep(void) | ||
94 | { | ||
95 | /* Supervisor mode, interrupts enabled upon wakeup */ | ||
96 | asm volatile ("stop #0x2000"); | ||
97 | }; | ||