128 lines
3.6 KiB
C
128 lines
3.6 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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* 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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*/
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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 "stack.h"
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#include <sbi.h>
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#include <encoding.h>
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#define K_SSTATUS_DEFAULT (SSTATUS_SPP | SSTATUS_SPIE | SSTATUS_SUM | SSTATUS_FS)
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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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void *_rt_hw_stack_init(rt_ubase_t *sp, rt_ubase_t ra, rt_ubase_t sstatus)
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{
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(*--sp) = 0; /* tp */
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(*--sp) = ra; /* ra */
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(*--sp) = 0; /* s0(fp) */
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(*--sp) = 0; /* s1 */
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(*--sp) = 0; /* s2 */
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(*--sp) = 0; /* s3 */
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(*--sp) = 0; /* s4 */
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(*--sp) = 0; /* s5 */
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(*--sp) = 0; /* s6 */
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(*--sp) = 0; /* s7 */
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(*--sp) = 0; /* s8 */
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(*--sp) = 0; /* s9 */
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(*--sp) = 0; /* s10 */
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(*--sp) = 0; /* s11 */
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(*--sp) = sstatus; /* sstatus */
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return (void *)sp;
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}
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/**
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* This function will initialize thread stack, we assuming
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* when scheduler restore this new thread, context will restore
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* an entry to user first application
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*
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* s0-s11, ra, sstatus, a0
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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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rt_ubase_t *sp = (rt_ubase_t *)stack_addr;
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// we use a strict alignment requirement for Q extension
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sp = (rt_ubase_t *)RT_ALIGN_DOWN((rt_ubase_t)sp, 16);
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(*--sp) = (rt_ubase_t)tentry;
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(*--sp) = (rt_ubase_t)parameter;
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(*--sp) = (rt_ubase_t)texit;
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/* compatible to RESTORE_CONTEXT */
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extern void _rt_thread_entry(void);
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return (rt_uint8_t *)_rt_hw_stack_init(sp, (rt_ubase_t)_rt_thread_entry, K_SSTATUS_DEFAULT);
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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()
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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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}
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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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