120 lines
4.9 KiB
C
120 lines
4.9 KiB
C
/***************************************************************************
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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) 2008 by Maurus Cuelenaere
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*
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* 32-bit MIPS 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 USED_ATTR _start_thread(void)
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{
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/* t1 = context */
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asm volatile (
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"start_thread: \n"
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".set push \n"
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".set noreorder \n"
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".set noat \n"
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"lw $8, 4($9) \n" /* Fetch thread function pointer ($8 = t0, $9 = t1) */
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"lw $29, 36($9) \n" /* Set initial sp(=$29) */
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"jalr $8 \n" /* Start the thread */
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"sw $0, 44($9) \n" /* Clear start address */
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".set pop \n"
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);
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thread_exit();
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}
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/* Place context pointer in s0 slot, function pointer in s1 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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".set push \n"
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".set noreorder \n"
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".set noat \n"
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"move $8, %0 \n" /* Store addr in clobbered t0 othrewise
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* compiler could select %0 to be s0-s7
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* during inlining which would break
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* things horribly.
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*/
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"sw $16, 0($8) \n" /* s0 */
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"sw $17, 4($8) \n" /* s1 */
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"sw $18, 8($8) \n" /* s2 */
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"sw $19, 12($8) \n" /* s3 */
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"sw $20, 16($8) \n" /* s4 */
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"sw $21, 20($8) \n" /* s5 */
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"sw $22, 24($8) \n" /* s6 */
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"sw $23, 28($8) \n" /* s7 */
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"sw $30, 32($8) \n" /* fp */
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"sw $29, 36($8) \n" /* sp */
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"sw $31, 40($8) \n" /* ra */
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".set pop \n"
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: : "r" (addr) : "t0"
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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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".set push \n"
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".set noat \n"
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".set noreorder \n"
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"lw $8, 44(%0) \n" /* Get start address ($8 = t0) */
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"beqz $8, running \n" /* NULL -> already running */
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"nop \n"
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"jr $8 \n"
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"move $9, %0 \n" /* t1 = context */
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"running: \n"
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"move $8, %0 \n" /* Store addr in clobbered t0 otherwise
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* compiler could select %0 to be s0-s7
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* during inlining which would break
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* things horribly.
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*/
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"lw $16, 0($8) \n" /* s0 */
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"lw $17, 4($8) \n" /* s1 */
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"lw $18, 8($8) \n" /* s2 */
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"lw $19, 12($8) \n" /* s3 */
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"lw $20, 16($8) \n" /* s4 */
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"lw $21, 20($8) \n" /* s5 */
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"lw $22, 24($8) \n" /* s6 */
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"lw $23, 28($8) \n" /* s7 */
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"lw $30, 32($8) \n" /* fp */
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"lw $29, 36($8) \n" /* sp */
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"lw $31, 40($8) \n" /* ra */
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".set pop \n"
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: : "r" (addr) : "t0", "t1"
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);
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}
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