127 lines
3.7 KiB
C
127 lines
3.7 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) 2002 by Ulf Ralberg
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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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#include "thread.h"
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typedef union
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{
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struct regs_t
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{
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unsigned int r[7]; /* Registers r8 thru r14 */
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void *sp; /* Stack pointer (r15) */
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unsigned int sr; /* Status register */
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void* gbr; /* Global base register */
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void* pr; /* Procedure register */
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} regs;
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unsigned int mem[32];
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} ctx_t;
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typedef struct
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{
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int created;
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int current;
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ctx_t ctx[MAXTHREADS] __attribute__ ((aligned (32)));
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} thread_t;
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static thread_t threads = {1, 0};
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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 stctx(void* addr)
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{
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__asm__ __volatile__ ("mov.l r8, @(0, %0)\n\t"
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"mov.l r9, @(4, %0)\n\t"
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"mov.l r10, @(8, %0)\n\t"
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"mov.l r11, @(12, %0)\n\t"
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"mov.l r12, @(16, %0)\n\t"
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"mov.l r13, @(20, %0)\n\t"
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"mov.l r14, @(24, %0)\n\t"
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"mov.l r15, @(28, %0)\n\t"
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"stc sr, r0\n\t"
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"mov.l r0, @(32, %0)\n\t"
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"stc gbr, r0\n\t"
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"mov.l r0, @(36, %0)\n\t"
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"sts pr, r0\n\t"
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"mov.l r0, @(40, %0)" :: "r" (addr));
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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 ldctx(void* addr)
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{
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__asm__ __volatile__ ("mov.l @(0, %0), r8\n\t"
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"mov.l @(4, %0), r9\n\t"
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"mov.l @(8, %0), r10\n\t"
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"mov.l @(12, %0), r11\n\t"
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"mov.l @(16, %0), r12\n\t"
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"mov.l @(20, %0), r13\n\t"
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"mov.l @(24, %0), r14\n\t"
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"mov.l @(28, %0), r15\n\t"
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"mov.l @(32, %0), r0\n\t"
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"ldc r0, sr\n\t"
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"mov.l @(36, %0), r0\n\t"
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"ldc r0, gbr\n\t"
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"mov.l @(40, %0), r0\n\t"
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"lds r0, pr\n\t"
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"mov.l r0, @(0, r15)" :: "r" (addr));
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}
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/*---------------------------------------------------------------------------
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* Switch thread in round robin fashion.
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*---------------------------------------------------------------------------
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*/
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void
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switch_thread(void)
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{
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int ct;
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int nt;
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thread_t* t = &threads;
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nt = ct = t->current;
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if (++nt >= t->created)
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nt = 0;
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t->current = nt;
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stctx(&t->ctx[ct]);
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ldctx(&t->ctx[nt]);
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}
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/*---------------------------------------------------------------------------
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* Create thread. Stack is aligned at 32 byte boundary to fit cache line.
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* > 220 bytes allocated on top for exception handlers as per EABI spec.
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* Return 0 if context area could be allocated, else -1.
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*---------------------------------------------------------------------------
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*/
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int create_thread(void* fp, void* sp, int stk_size)
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{
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thread_t* t = &threads;
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if (t->created >= MAXTHREADS)
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return -1;
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else
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{
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ctx_t* ctxp = &t->ctx[t->created++];
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stctx(ctxp);
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ctxp->regs.sp = (void*)(((unsigned int)sp + stk_size) & ~31);
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ctxp->regs.pr = fp;
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}
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return 0;
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}
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