/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2004 by Linus Nielsen Feltzing * * Coldfire processor threading support * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ /*--------------------------------------------------------------------------- * Start the thread running and terminate it if it returns *--------------------------------------------------------------------------- */ void start_thread(void); /* Provide C access to ASM label */ static void __attribute__((used)) __start_thread(void) { /* a0=macsr, a1=context */ asm volatile ( "start_thread: \n" /* Start here - no naked attribute */ "move.l %a0, %macsr \n" /* Set initial mac status reg */ "lea.l 48(%a1), %a1 \n" "move.l (%a1)+, %sp \n" /* Set initial stack */ "move.l (%a1), %a2 \n" /* Fetch thread function pointer */ "clr.l (%a1) \n" /* Mark thread running */ "jsr (%a2) \n" /* Call thread function */ ); thread_exit(); } /* Set EMAC unit to fractional mode with saturation for each new thread, * since that's what'll be the most useful for most things which the dsp * will do. Codecs should still initialize their preferred modes * explicitly. Context pointer is placed in d2 slot and start_thread * pointer in d3 slot. thread function pointer is placed in context.start. * See load_context for what happens when thread is initially going to * run. */ #define THREAD_STARTUP_INIT(core, thread, function) \ ({ (thread)->context.macsr = EMAC_FRACTIONAL | EMAC_SATURATE, \ (thread)->context.d[0] = (uint32_t)&(thread)->context, \ (thread)->context.d[1] = (uint32_t)start_thread, \ (thread)->context.start = (uint32_t)(function); }) /*--------------------------------------------------------------------------- * Store non-volatile context. *--------------------------------------------------------------------------- */ static inline void store_context(void* addr) { asm volatile ( "move.l %%macsr,%%d0 \n" "movem.l %%d0/%%d2-%%d7/%%a2-%%a7,(%0) \n" : : "a" (addr) : "d0" /* only! */ ); } /*--------------------------------------------------------------------------- * Load non-volatile context. *--------------------------------------------------------------------------- */ static inline void load_context(const void* addr) { asm volatile ( "move.l 52(%0), %%d0 \n" /* Get start address */ "beq.b 1f \n" /* NULL -> already running */ "movem.l (%0), %%a0-%%a2 \n" /* a0=macsr, a1=context, a2=start_thread */ "jmp (%%a2) \n" /* Start the thread */ "1: \n" "movem.l (%0), %%d0/%%d2-%%d7/%%a2-%%a7 \n" /* Load context */ "move.l %%d0, %%macsr \n" : : "a" (addr) : "d0" /* only! */ ); } /*--------------------------------------------------------------------------- * Put core in a power-saving state if waking list wasn't repopulated. *--------------------------------------------------------------------------- */ static inline void core_sleep(void) { /* Supervisor mode, interrupts enabled upon wakeup */ asm volatile ("stop #0x2000"); };