78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021/02/19 Bernard Implement rt_hw_context_switch_interrupt in C
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*/
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#include <rthw.h>
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#include <rtthread.h>
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volatile rt_ubase_t rt_interrupt_from_thread = 0;
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volatile rt_ubase_t rt_interrupt_to_thread = 0;
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volatile rt_uint32_t rt_thread_switch_interrupt_flag = 0;
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rt_base_t rt_hw_interrupt_disable(void)
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{
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rt_base_t level;
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__asm__ __volatile__("pushfl ; popl %0 ; cli":"=g" (level): :"memory");
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return level;
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}
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void rt_hw_interrupt_enable(rt_base_t level)
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{
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__asm__ __volatile__("pushl %0 ; popfl": :"g" (level):"memory", "cc");
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}
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void rt_hw_context_switch_interrupt(rt_ubase_t from, rt_ubase_t to, rt_thread_t from_thread, rt_thread_t to_thread)
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{
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if (rt_thread_switch_interrupt_flag == 0)
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rt_interrupt_from_thread = from;
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rt_interrupt_to_thread = to;
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rt_thread_switch_interrupt_flag = 1;
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return ;
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}
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/**
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* This function will initialize thread stack
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*
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* @param tentry the entry of thread
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* @param parameter the parameter of entry
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* @param stack_addr the beginning stack address
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* @param texit the function will be called when thread exit
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*
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* @return stack address
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*/
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rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
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rt_uint8_t *stack_addr, void *texit)
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{
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unsigned long *stk;
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stk = (unsigned long *)stack_addr;
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*(--stk) = (unsigned long)parameter;
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*(--stk) = (unsigned long)texit;
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*(--stk) = 0x200; /*flags*/
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*(--stk) = 0x08; /*cs*/
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*(--stk) = (unsigned long)tentry; /*eip*/
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*(--stk) = 0; /*irqno*/
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*(--stk) = 0x10; /*ds*/
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*(--stk) = 0x10; /*es*/
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*(--stk) = 0; /*eax*/
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*(--stk) = 0; /*ecx*/
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*(--stk) = 0; /*edx*/
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*(--stk) = 0; /*ebx*/
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*(--stk) = 0; /*esp*/
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*(--stk) = 0; /*ebp*/
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*(--stk) = 0; /*esi*/
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*(--stk) = 0; /*edi*/
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/* return task's current stack address */
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return (rt_uint8_t *)stk;
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}
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