tsiry-sandratraina.com
A modern Music Player Daemon based on Rockbox open source high quality audio player
libadwaita
audio
rust
zig
deno
mpris
rockbox
mpd
1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2008 by Maurus Cuelenaere
11 *
12 * 32-bit MIPS 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
29void start_thread(void) USED_ATTR; /* Provide C access to ASM label */
30static void USED_ATTR _start_thread(void)
31{
32 /* t1 = context */
33 asm volatile (
34 "start_thread: \n"
35 ".set push \n"
36 ".set noreorder \n"
37 ".set noat \n"
38 "lw $8, 4($9) \n" /* Fetch thread function pointer ($8 = t0, $9 = t1) */
39 "lw $29, 36($9) \n" /* Set initial sp(=$29) */
40 "jalr $8 \n" /* Start the thread */
41 "sw $0, 44($9) \n" /* Clear start address */
42 ".set pop \n"
43 );
44 thread_exit();
45}
46
47/* Place context pointer in s0 slot, function pointer in s1 slot, and
48 * start_thread pointer in context_start */
49#define THREAD_STARTUP_INIT(core, thread, function) \
50 ({ (thread)->context.r[0] = (uint32_t)&(thread)->context, \
51 (thread)->context.r[1] = (uint32_t)(function), \
52 (thread)->context.start = (uint32_t)start_thread; })
53
54/*---------------------------------------------------------------------------
55 * Store non-volatile context.
56 *---------------------------------------------------------------------------
57 */
58static inline void store_context(void* addr)
59{
60 asm volatile (
61 ".set push \n"
62 ".set noreorder \n"
63 ".set noat \n"
64 "move $8, %0 \n" /* Store addr in clobbered t0 othrewise
65 * compiler could select %0 to be s0-s7
66 * during inlining which would break
67 * things horribly.
68 */
69 "sw $16, 0($8) \n" /* s0 */
70 "sw $17, 4($8) \n" /* s1 */
71 "sw $18, 8($8) \n" /* s2 */
72 "sw $19, 12($8) \n" /* s3 */
73 "sw $20, 16($8) \n" /* s4 */
74 "sw $21, 20($8) \n" /* s5 */
75 "sw $22, 24($8) \n" /* s6 */
76 "sw $23, 28($8) \n" /* s7 */
77 "sw $30, 32($8) \n" /* fp */
78 "sw $29, 36($8) \n" /* sp */
79 "sw $31, 40($8) \n" /* ra */
80 ".set pop \n"
81 : : "r" (addr) : "t0"
82 );
83}
84
85/*---------------------------------------------------------------------------
86 * Load non-volatile context.
87 *---------------------------------------------------------------------------
88 */
89static inline void load_context(const void* addr)
90{
91 asm volatile (
92 ".set push \n"
93 ".set noat \n"
94 ".set noreorder \n"
95 "lw $8, 44(%0) \n" /* Get start address ($8 = t0) */
96 "beqz $8, running \n" /* NULL -> already running */
97 "nop \n"
98 "jr $8 \n"
99 "move $9, %0 \n" /* t1 = context */
100 "running: \n"
101 "move $8, %0 \n" /* Store addr in clobbered t0 otherwise
102 * compiler could select %0 to be s0-s7
103 * during inlining which would break
104 * things horribly.
105 */
106 "lw $16, 0($8) \n" /* s0 */
107 "lw $17, 4($8) \n" /* s1 */
108 "lw $18, 8($8) \n" /* s2 */
109 "lw $19, 12($8) \n" /* s3 */
110 "lw $20, 16($8) \n" /* s4 */
111 "lw $21, 20($8) \n" /* s5 */
112 "lw $22, 24($8) \n" /* s6 */
113 "lw $23, 28($8) \n" /* s7 */
114 "lw $30, 32($8) \n" /* fp */
115 "lw $29, 36($8) \n" /* sp */
116 "lw $31, 40($8) \n" /* ra */
117 ".set pop \n"
118 : : "r" (addr) : "t0", "t1"
119 );
120}