98 lines
3.6 KiB
C
98 lines
3.6 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdio.h>
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#include "py/obj.h"
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#include "gccollect.h"
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#include "irq.h"
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#include "pybthread.h"
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#if MICROPY_PY_THREAD
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int pyb_thread_enabled;
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pyb_thread_t *pyb_thread_cur;
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void pyb_thread_init(pyb_thread_t *thread) {
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pyb_thread_cur = thread;
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pyb_thread_cur->sp = NULL; // will be set when this thread switches out
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pyb_thread_cur->local_state = 0; // will be set by mp_thread_init
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pyb_thread_cur->arg = NULL;
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pyb_thread_cur->stack = &_heap_end;
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pyb_thread_cur->stack_len = ((uint32_t)&_estack - (uint32_t)&_heap_end) / sizeof(uint32_t);
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pyb_thread_cur->prev = thread;
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pyb_thread_cur->next = thread;
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}
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STATIC void pyb_thread_terminate(void) {
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uint32_t irq_state = raise_irq_pri(IRQ_PRI_PENDSV);
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pyb_thread_cur->prev->next = pyb_thread_cur->next;
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pyb_thread_cur->next->prev = pyb_thread_cur->prev;
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if (pyb_thread_cur->next == pyb_thread_cur->prev) {
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pyb_thread_enabled = 0;
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}
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restore_irq_pri(irq_state);
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pyb_thread_yield(); // should not return
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}
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uint32_t pyb_thread_new(pyb_thread_t *thread, void *stack, size_t stack_len, void *entry, void *arg) {
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uint32_t *stack_top = (uint32_t*)stack + stack_len; // stack is full descending
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*--stack_top = 0x01000000; // xPSR (thumb bit set)
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*--stack_top = (uint32_t)entry & 0xfffffffe; // pc (must have bit 0 cleared, even for thumb code)
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*--stack_top = (uint32_t)pyb_thread_terminate; // lr
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*--stack_top = 0; // r12
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*--stack_top = 0; // r3
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*--stack_top = 0; // r2
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*--stack_top = 0; // r1
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*--stack_top = (uint32_t)arg; // r0
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*--stack_top = 0xfffffff9; // lr (return to thread mode, non-FP, use MSP)
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stack_top -= 8; // r4-r11
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stack_top -= 16; // s16-s31 (we assume all threads use FP registers)
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thread->sp = stack_top;
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thread->local_state = 0;
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thread->arg = arg;
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thread->stack = stack;
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thread->stack_len = stack_len;
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uint32_t irq_state = raise_irq_pri(IRQ_PRI_PENDSV);
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pyb_thread_enabled = 1;
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thread->next = pyb_thread_cur->next;
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thread->prev = pyb_thread_cur;
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pyb_thread_cur->next->prev = thread;
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pyb_thread_cur->next = thread;
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restore_irq_pri(irq_state);
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return (uint32_t)thread; // success
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}
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// should only be called from pendsv_isr_handler
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void *pyb_thread_next(void *sp) {
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pyb_thread_cur->sp = sp;
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pyb_thread_cur = pyb_thread_cur->next;
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return pyb_thread_cur->sp;
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}
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#endif // MICROPY_PY_THREAD
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