110 lines
4.2 KiB
C
110 lines
4.2 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Ulf Ralberg
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*
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* SH processor threading support
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*---------------------------------------------------------------------------
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* Start the thread running and terminate it if it returns
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*---------------------------------------------------------------------------
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*/
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void start_thread(void); /* Provide C access to ASM label */
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static void __attribute__((used)) __start_thread(void)
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{
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/* r8 = context */
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asm volatile (
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"_start_thread: \n" /* Start here - no naked attribute */
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"mov.l @(4, r8), r0 \n" /* Fetch thread function pointer */
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"mov.l @(28, r8), r15 \n" /* Set initial sp */
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"mov #0, r1 \n" /* Start the thread */
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"jsr @r0 \n"
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"mov.l r1, @(36, r8) \n" /* Clear start address */
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);
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thread_exit();
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}
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/* Place context pointer in r8 slot, function pointer in r9 slot, and
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* start_thread pointer in context_start */
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#define THREAD_STARTUP_INIT(core, thread, function) \
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({ (thread)->context.r[0] = (uint32_t)&(thread)->context, \
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(thread)->context.r[1] = (uint32_t)(function), \
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(thread)->context.start = (uint32_t)start_thread; })
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/*---------------------------------------------------------------------------
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* Store non-volatile context.
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*---------------------------------------------------------------------------
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*/
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static inline void store_context(void* addr)
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{
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asm volatile (
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"add #36, %0 \n" /* Start at last reg. By the time routine */
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"sts.l pr, @-%0 \n" /* is done, %0 will have the original value */
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"mov.l r15,@-%0 \n"
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"mov.l r14,@-%0 \n"
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"mov.l r13,@-%0 \n"
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"mov.l r12,@-%0 \n"
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"mov.l r11,@-%0 \n"
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"mov.l r10,@-%0 \n"
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"mov.l r9, @-%0 \n"
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"mov.l r8, @-%0 \n"
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: : "r" (addr)
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);
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}
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/*---------------------------------------------------------------------------
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* Load non-volatile context.
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*---------------------------------------------------------------------------
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*/
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static inline void load_context(const void* addr)
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{
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asm volatile (
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"mov.l @(36, %0), r0 \n" /* Get start address */
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"tst r0, r0 \n"
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"bt .running \n" /* NULL -> already running */
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"jmp @r0 \n" /* r8 = context */
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".running: \n"
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"mov.l @%0+, r8 \n" /* Executes in delay slot and outside it */
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"mov.l @%0+, r9 \n"
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"mov.l @%0+, r10 \n"
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"mov.l @%0+, r11 \n"
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"mov.l @%0+, r12 \n"
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"mov.l @%0+, r13 \n"
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"mov.l @%0+, r14 \n"
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"mov.l @%0+, r15 \n"
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"lds.l @%0+, pr \n"
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: : "r" (addr) : "r0" /* only! */
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);
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}
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/*---------------------------------------------------------------------------
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* Put core in a power-saving state.
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*---------------------------------------------------------------------------
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*/
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static inline void core_sleep(void)
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{
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asm volatile (
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"and.b #0x7f, @(r0, gbr) \n" /* Clear SBY (bit 7) in SBYCR */
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"mov #0, r1 \n" /* Enable interrupts */
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"ldc r1, sr \n" /* Following instruction cannot be interrupted */
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"sleep \n" /* Execute standby */
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: : "z"(&SBYCR-GBR) : "r1");
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}
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