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128 lines
3.1 KiB
128 lines
3.1 KiB
5 months ago
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/*
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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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* 2018/10/28 Bernard The unify RISC-V porting code.
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* 2021-02-11 lizhirui add gp support
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* 2021-11-19 JasonHu add fpu support
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "cpuport.h"
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#include "sbi.h"
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#include "stack.h"
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#ifdef RT_USING_SMART
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#include <lwp_arch.h>
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#endif
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/**
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* @brief from thread used interrupt context switch
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*
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*/
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volatile rt_ubase_t rt_interrupt_from_thread = 0;
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/**
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* @brief to thread used interrupt context switch
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*
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*/
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volatile rt_ubase_t rt_interrupt_to_thread = 0;
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/**
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* @brief flag to indicate context switch in interrupt or not
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*
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*/
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volatile rt_ubase_t rt_thread_switch_interrupt_flag = 0;
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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,
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void *parameter,
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rt_uint8_t *stack_addr,
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void *texit)
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{
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struct rt_hw_stack_frame *frame;
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rt_uint8_t *stk;
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int i;
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extern int __global_pointer$;
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stk = stack_addr + sizeof(rt_ubase_t);
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stk = (rt_uint8_t *)RT_ALIGN_DOWN((rt_ubase_t)stk, REGBYTES);
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stk -= sizeof(struct rt_hw_stack_frame);
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frame = (struct rt_hw_stack_frame *)stk;
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for (i = 0; i < sizeof(struct rt_hw_stack_frame) / sizeof(rt_ubase_t); i++)
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{
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((rt_ubase_t *)frame)[i] = 0xdeadbeef;
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}
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frame->ra = (rt_ubase_t)texit;
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frame->gp = (rt_ubase_t)&__global_pointer$;
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frame->a0 = (rt_ubase_t)parameter;
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frame->epc = (rt_ubase_t)tentry;
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frame->user_sp_exc_stack = (rt_ubase_t)(((rt_ubase_t)stk) + sizeof(struct rt_hw_stack_frame));
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/* force to supervisor mode(SPP=1) and set SPIE and SUM to 1 */
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#ifdef ENABLE_FPU
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frame->sstatus = 0x00046120; /* enable FPU */
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#else
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frame->sstatus = 0x00040120;
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#endif
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return stk;
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}
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/*
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* #ifdef RT_USING_SMP
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* void rt_hw_context_switch_interrupt(void *context, rt_ubase_t from, rt_ubase_t to, struct rt_thread *to_thread);
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* #else
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* void rt_hw_context_switch_interrupt(rt_ubase_t from, rt_ubase_t to);
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* #endif
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*/
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#ifndef RT_USING_SMP
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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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#endif /* end of RT_USING_SMP */
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/** shutdown CPU */
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void rt_hw_cpu_shutdown(void)
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{
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rt_uint32_t level;
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rt_kprintf("shutdown...\n");
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level = rt_hw_interrupt_disable();
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sbi_shutdown();
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while (1);
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}
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int rt_hw_cpu_id(void)
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{
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return 0; /* d1 has one core */
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}
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void rt_hw_set_process_id(int pid)
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{
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//TODO
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}
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