2010-06-02 12:45:36 +00:00
|
|
|
/***************************************************************************
|
|
|
|
|
* __________ __ ___.
|
|
|
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
|
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
|
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
|
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
|
|
|
* \/ \/ \/ \/ \/
|
|
|
|
|
* $Id$
|
|
|
|
|
*
|
|
|
|
|
* Copyright (C) 2008 by Maurus Cuelenaere
|
|
|
|
|
*
|
|
|
|
|
* 32-bit MIPS 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 */
|
2011-12-09 15:33:59 +00:00
|
|
|
static void USED_ATTR _start_thread(void)
|
2010-06-02 12:45:36 +00:00
|
|
|
{
|
|
|
|
|
/* t1 = context */
|
|
|
|
|
asm volatile (
|
|
|
|
|
"start_thread: \n"
|
|
|
|
|
".set noreorder \n"
|
|
|
|
|
".set noat \n"
|
|
|
|
|
"lw $8, 4($9) \n" /* Fetch thread function pointer ($8 = t0, $9 = t1) */
|
|
|
|
|
"lw $29, 36($9) \n" /* Set initial sp(=$29) */
|
|
|
|
|
"jalr $8 \n" /* Start the thread */
|
|
|
|
|
"sw $0, 44($9) \n" /* Clear start address */
|
|
|
|
|
".set at \n"
|
|
|
|
|
".set reorder \n"
|
|
|
|
|
);
|
|
|
|
|
thread_exit();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Place context pointer in s0 slot, function pointer in s1 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 (
|
|
|
|
|
".set noreorder \n"
|
|
|
|
|
".set noat \n"
|
|
|
|
|
"sw $16, 0(%0) \n" /* s0 */
|
|
|
|
|
"sw $17, 4(%0) \n" /* s1 */
|
|
|
|
|
"sw $18, 8(%0) \n" /* s2 */
|
|
|
|
|
"sw $19, 12(%0) \n" /* s3 */
|
|
|
|
|
"sw $20, 16(%0) \n" /* s4 */
|
|
|
|
|
"sw $21, 20(%0) \n" /* s5 */
|
|
|
|
|
"sw $22, 24(%0) \n" /* s6 */
|
|
|
|
|
"sw $23, 28(%0) \n" /* s7 */
|
|
|
|
|
"sw $30, 32(%0) \n" /* fp */
|
|
|
|
|
"sw $29, 36(%0) \n" /* sp */
|
|
|
|
|
"sw $31, 40(%0) \n" /* ra */
|
|
|
|
|
".set at \n"
|
|
|
|
|
".set reorder \n"
|
|
|
|
|
: : "r" (addr)
|
|
|
|
|
);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*---------------------------------------------------------------------------
|
|
|
|
|
* Load non-volatile context.
|
|
|
|
|
*---------------------------------------------------------------------------
|
|
|
|
|
*/
|
|
|
|
|
static inline void load_context(const void* addr)
|
|
|
|
|
{
|
|
|
|
|
asm volatile (
|
|
|
|
|
".set noat \n"
|
|
|
|
|
".set noreorder \n"
|
|
|
|
|
"lw $8, 44(%0) \n" /* Get start address ($8 = t0) */
|
|
|
|
|
"beqz $8, running \n" /* NULL -> already running */
|
|
|
|
|
"nop \n"
|
|
|
|
|
"jr $8 \n"
|
|
|
|
|
"move $9, %0 \n" /* t1 = context */
|
|
|
|
|
"running: \n"
|
|
|
|
|
"lw $16, 0(%0) \n" /* s0 */
|
|
|
|
|
"lw $17, 4(%0) \n" /* s1 */
|
|
|
|
|
"lw $18, 8(%0) \n" /* s2 */
|
|
|
|
|
"lw $19, 12(%0) \n" /* s3 */
|
|
|
|
|
"lw $20, 16(%0) \n" /* s4 */
|
|
|
|
|
"lw $21, 20(%0) \n" /* s5 */
|
|
|
|
|
"lw $22, 24(%0) \n" /* s6 */
|
|
|
|
|
"lw $23, 28(%0) \n" /* s7 */
|
|
|
|
|
"lw $30, 32(%0) \n" /* fp */
|
|
|
|
|
"lw $29, 36(%0) \n" /* sp */
|
|
|
|
|
"lw $31, 40(%0) \n" /* ra */
|
|
|
|
|
".set at \n"
|
|
|
|
|
".set reorder \n"
|
|
|
|
|
: : "r" (addr) : "t0", "t1"
|
|
|
|
|
);
|
|
|
|
|
}
|
|
|
|
|
|
