1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2005 by Thom Johansen
12 * Generic ARM threading support
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.
19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20 * KIND, either express or implied.
22 ****************************************************************************/
24 /*---------------------------------------------------------------------------
25 * Start the thread running and terminate it if it returns
26 *---------------------------------------------------------------------------
28 static void __attribute__((naked
,used
)) start_thread(void)
32 "ldr sp, [r0, #32] \n" /* Load initial sp */
33 "ldr r4, [r0, #40] \n" /* start in r4 since it's non-volatile */
34 "mov r1, #0 \n" /* Mark thread as running */
35 "str r1, [r0, #40] \n"
37 "ldr r0, =cpucache_invalidate \n" /* Invalidate this core's cache. */
38 "mov lr, pc \n" /* This could be the first entry into */
39 "bx r0 \n" /* plugin or codec code for this core. */
41 "mov lr, pc \n" /* Call thread function */
43 ); /* No clobber list - new thread doesn't care */
46 asm volatile (".ltorg"); /* Dump constant pool */
50 /* For startup, place context pointer in r4 slot, start_thread pointer in r5
51 * slot, and thread function pointer in context.start. See load_context for
52 * what happens when thread is initially going to run. */
53 #define THREAD_STARTUP_INIT(core, thread, function) \
54 ({ (thread)->context.r[0] = (uint32_t)&(thread)->context, \
55 (thread)->context.r[1] = (uint32_t)start_thread, \
56 (thread)->context.start = (uint32_t)function; })
59 /*---------------------------------------------------------------------------
60 * Store non-volatile context.
61 *---------------------------------------------------------------------------
63 static inline void store_context(void* addr
)
66 "stmia %0, { r4-r11, sp, lr } \n"
71 /*---------------------------------------------------------------------------
72 * Load non-volatile context.
73 *---------------------------------------------------------------------------
75 static inline void load_context(const void* addr
)
78 "ldr r0, [%0, #40] \n" /* Load start pointer */
79 "cmp r0, #0 \n" /* Check for NULL */
81 /* If not already running, jump to start */
82 #if ARM_ARCH == 4 && defined(USE_THUMB)
83 "ldmneia %0, { r0, r12 } \n"
86 "ldmneia %0, { r0, pc } \n"
89 "ldmia %0, { r4-r11, sp, lr } \n" /* Load regs r4 to r14 from context */
90 : : "r" (addr
) : "r0" /* only! */
94 #if defined(CPU_TCC780X) || defined(CPU_TCC77X) /* Single core only for now */ \
95 || CONFIG_CPU == IMX31L || CONFIG_CPU == DM320 || CONFIG_CPU == AS3525 \
96 || CONFIG_CPU == S3C2440 || CONFIG_CPU == S5L8701 || CONFIG_CPU == AS3525v2
97 /* Use the generic ARMv4/v5/v6 wait for IRQ */
98 static inline void core_sleep(void)
101 "mcr p15, 0, %0, c7, c0, 4 \n" /* Wait for interrupt */
102 #if CONFIG_CPU == IMX31L
103 "nop\n nop\n nop\n nop\n nop\n" /* Clean out the pipes */
110 /* Skip this if special code is required and implemented */
112 static inline void core_sleep(void)
114 #warning core_sleep not implemented, battery life will be decreased