/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2002 by Ulf Ralberg * * SH 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) { /* r8 = context */ asm volatile ( "_start_thread: \n" /* Start here - no naked attribute */ "mov.l @(4, r8), r0 \n" /* Fetch thread function pointer */ "mov.l @(28, r8), r15 \n" /* Set initial sp */ "mov #0, r1 \n" /* Start the thread */ "jsr @r0 \n" "mov.l r1, @(36, r8) \n" /* Clear start address */ ); thread_exit(); } /* Place context pointer in r8 slot, function pointer in r9 slot, and * start_thread pointer in context_start */ #define THREAD_STARTUP_INIT(core, thread, function) \ ({ (thread)->context.r[0] = (uint32_t)&(thread)->context, \ (thread)->context.r[1] = (uint32_t)(function), \ (thread)->context.start = (uint32_t)start_thread; }) /*--------------------------------------------------------------------------- * Store non-volatile context. *--------------------------------------------------------------------------- */ static inline void store_context(void* addr) { asm volatile ( "add #36, %0 \n" /* Start at last reg. By the time routine */ "sts.l pr, @-%0 \n" /* is done, %0 will have the original value */ "mov.l r15,@-%0 \n" "mov.l r14,@-%0 \n" "mov.l r13,@-%0 \n" "mov.l r12,@-%0 \n" "mov.l r11,@-%0 \n" "mov.l r10,@-%0 \n" "mov.l r9, @-%0 \n" "mov.l r8, @-%0 \n" : : "r" (addr) ); } /*--------------------------------------------------------------------------- * Load non-volatile context. *--------------------------------------------------------------------------- */ static inline void load_context(const void* addr) { asm volatile ( "mov.l @(36, %0), r0 \n" /* Get start address */ "tst r0, r0 \n" "bt .running \n" /* NULL -> already running */ "jmp @r0 \n" /* r8 = context */ ".running: \n" "mov.l @%0+, r8 \n" /* Executes in delay slot and outside it */ "mov.l @%0+, r9 \n" "mov.l @%0+, r10 \n" "mov.l @%0+, r11 \n" "mov.l @%0+, r12 \n" "mov.l @%0+, r13 \n" "mov.l @%0+, r14 \n" "mov.l @%0+, r15 \n" "lds.l @%0+, pr \n" : : "r" (addr) : "r0" /* only! */ ); } /*--------------------------------------------------------------------------- * Put core in a power-saving state. *--------------------------------------------------------------------------- */ static inline void core_sleep(void) { asm volatile ( "and.b #0x7f, @(r0, gbr) \n" /* Clear SBY (bit 7) in SBYCR */ "mov #0, r1 \n" /* Enable interrupts */ "ldc r1, sr \n" /* Following instruction cannot be interrupted */ "sleep \n" /* Execute standby */ : : "z"(&SBYCR-GBR) : "r1"); }