diff options
Diffstat (limited to 'apps/plugins/xrick/system/sysmem_rockbox.c')
-rw-r--r-- | apps/plugins/xrick/system/sysmem_rockbox.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/apps/plugins/xrick/system/sysmem_rockbox.c b/apps/plugins/xrick/system/sysmem_rockbox.c new file mode 100644 index 0000000000..06a683a463 --- /dev/null +++ b/apps/plugins/xrick/system/sysmem_rockbox.c | |||
@@ -0,0 +1,156 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Port of xrick, a Rick Dangerous clone, to Rockbox. | ||
11 | * See http://www.bigorno.net/xrick/ | ||
12 | * | ||
13 | * Copyright (C) 2008-2014 Pierluigi Vicinanza | ||
14 | * | ||
15 | * This program is free software; you can redistribute it and/or | ||
16 | * modify it under the terms of the GNU General Public License | ||
17 | * as published by the Free Software Foundation; either version 2 | ||
18 | * of the License, or (at your option) any later version. | ||
19 | * | ||
20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
21 | * KIND, either express or implied. | ||
22 | * | ||
23 | ****************************************************************************/ | ||
24 | |||
25 | #include "xrick/system/system.h" | ||
26 | |||
27 | #include "xrick/debug.h" | ||
28 | |||
29 | #include "plugin.h" | ||
30 | |||
31 | /* | ||
32 | * Local variables | ||
33 | */ | ||
34 | enum | ||
35 | { | ||
36 | ALIGNMENT = sizeof(void*) /* this is more of an educated guess; might want to adjust for your specific architecture */ | ||
37 | }; | ||
38 | static U8 * stackBuffer; | ||
39 | static U8 * stackTop; | ||
40 | static size_t stackSize; | ||
41 | static size_t stackMaxSize; | ||
42 | static bool isMemoryInitialised = false; | ||
43 | IFDEBUG_MEMORY( static size_t maxUsedMemory = 0; ); | ||
44 | |||
45 | /* | ||
46 | * Initialise memory stack | ||
47 | */ | ||
48 | bool sysmem_init(void) | ||
49 | { | ||
50 | if (isMemoryInitialised) | ||
51 | { | ||
52 | return true; | ||
53 | } | ||
54 | |||
55 | if (rb->audio_status()) | ||
56 | { | ||
57 | /* Playback must be stopped the entire time the sound buffer is used.*/ | ||
58 | rb->audio_stop(); | ||
59 | } | ||
60 | |||
61 | stackBuffer = rb->plugin_get_audio_buffer(&stackMaxSize); | ||
62 | stackTop = stackBuffer; | ||
63 | stackSize = 0; | ||
64 | isMemoryInitialised = true; | ||
65 | return true; | ||
66 | } | ||
67 | |||
68 | /* | ||
69 | * Cleanup memory stack | ||
70 | */ | ||
71 | void sysmem_shutdown(void) | ||
72 | { | ||
73 | if (!isMemoryInitialised) | ||
74 | { | ||
75 | return; | ||
76 | } | ||
77 | |||
78 | if (stackTop != stackBuffer || stackSize != 0) | ||
79 | { | ||
80 | sys_error("(memory) improper deallocation detected"); | ||
81 | } | ||
82 | |||
83 | IFDEBUG_MEMORY( | ||
84 | sys_printf("xrick/memory: max memory usage was %u bytes\n", maxUsedMemory); | ||
85 | ); | ||
86 | |||
87 | isMemoryInitialised = false; | ||
88 | } | ||
89 | |||
90 | /* | ||
91 | * Allocate a memory-aligned block on top of the memory stack | ||
92 | */ | ||
93 | void *sysmem_push(size_t size) | ||
94 | { | ||
95 | uintptr_t alignedPtr; | ||
96 | size_t * allocatedSizePtr; | ||
97 | |||
98 | size_t neededSize = sizeof(size_t) + size + (ALIGNMENT - 1); | ||
99 | if (stackSize + neededSize > stackMaxSize) | ||
100 | { | ||
101 | sys_error("(memory) tried to allocate a block when memory full"); | ||
102 | return NULL; | ||
103 | } | ||
104 | |||
105 | alignedPtr = (((uintptr_t)stackTop) + sizeof(size_t) + ALIGNMENT) & ~((uintptr_t)(ALIGNMENT - 1)); | ||
106 | |||
107 | allocatedSizePtr = (size_t *)(alignedPtr); | ||
108 | allocatedSizePtr[-1] = neededSize; | ||
109 | |||
110 | stackTop += neededSize; | ||
111 | stackSize += neededSize; | ||
112 | |||
113 | IFDEBUG_MEMORY( | ||
114 | sys_printf("xrick/memory: allocated %u bytes\n", neededSize); | ||
115 | if (stackSize > maxUsedMemory) maxUsedMemory = stackSize; | ||
116 | ); | ||
117 | |||
118 | return (void *)alignedPtr; | ||
119 | } | ||
120 | |||
121 | /* | ||
122 | * Release block from the top of the memory stack | ||
123 | */ | ||
124 | void sysmem_pop(void * alignedPtr) | ||
125 | { | ||
126 | size_t allocatedSize; | ||
127 | |||
128 | if (!alignedPtr) | ||
129 | { | ||
130 | return; | ||
131 | } | ||
132 | |||
133 | if (stackSize == 0) | ||
134 | { | ||
135 | sys_error("(memory) tried to release a block when memory empty"); | ||
136 | return; | ||
137 | } | ||
138 | |||
139 | allocatedSize = ((size_t *)(alignedPtr))[-1]; | ||
140 | stackTop -= allocatedSize; | ||
141 | stackSize -= allocatedSize; | ||
142 | |||
143 | IFDEBUG_MEMORY( | ||
144 | if ((uintptr_t)alignedPtr != ((((uintptr_t)stackTop) + sizeof(size_t) + ALIGNMENT) & ~((uintptr_t)(ALIGNMENT - 1)))) | ||
145 | { | ||
146 | sys_error("(memory) tried to release a wrong block"); | ||
147 | return; | ||
148 | } | ||
149 | ); | ||
150 | |||
151 | IFDEBUG_MEMORY( | ||
152 | sys_printf("xrick/memory: released %u bytes\n", allocatedSize); | ||
153 | ); | ||
154 | } | ||
155 | |||
156 | /* eof */ | ||