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120 lines
2.5 KiB
120 lines
2.5 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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* 2018/10/02 Bernard The first version
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* 2018/12/27 Jesven Add SMP schedule
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* 2021/02/02 lizhirui Add userspace support
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* 2021/12/24 JasonHu Add user setting save/restore
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*/
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#include "cpuport.h"
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#include "encoding.h"
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#include "stackframe.h"
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.section .text.entry
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.align 2
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.global trap_entry
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.extern __stack_cpu0
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.extern get_current_thread_kernel_stack_top
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trap_entry:
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//backup sp
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csrrw sp, sscratch, sp
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//load interrupt stack
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la sp, __stack_cpu0
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//backup context
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SAVE_ALL
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RESTORE_SYS_GP
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#ifdef RT_USING_SMART
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//check syscall
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csrr t0, scause
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li t1, 8//environment call from u-mode
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beq t0, t1, syscall_entry
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#endif
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csrr a0, scause
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csrrc a1, stval, zero
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csrr a2, sepc
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mv a3, sp
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/* scause, stval, sepc, sp */
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call handle_trap
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/* need to switch new thread */
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la s0, rt_thread_switch_interrupt_flag
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lw s2, 0(s0)
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beqz s2, spurious_interrupt
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sw zero, 0(s0)
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.global rt_hw_context_switch_interrupt_do
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rt_hw_context_switch_interrupt_do:
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#ifdef RT_USING_SMART
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//swap to thread kernel stack
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csrr t0, sstatus
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andi t0, t0, 0x100
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beqz t0, __restore_sp_from_tcb_interrupt
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#endif
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__restore_sp_from_sscratch_interrupt:
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csrr t0, sscratch
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j __move_stack_context_interrupt
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#ifdef RT_USING_SMART
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__restore_sp_from_tcb_interrupt:
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la s0, rt_interrupt_from_thread
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LOAD a0, 0(s0)
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jal rt_thread_sp_to_thread
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jal get_thread_kernel_stack_top
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mv t0, a0
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#endif
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__move_stack_context_interrupt:
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mv t1, sp//src
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mv sp, t0//switch stack
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addi sp, sp, -CTX_REG_NR * REGBYTES
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//copy context
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li s0, CTX_REG_NR//cnt
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mv t2, sp//dst
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copy_context_loop_interrupt:
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LOAD t0, 0(t1)
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STORE t0, 0(t2)
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addi s0, s0, -1
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addi t1, t1, 8
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addi t2, t2, 8
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bnez s0, copy_context_loop_interrupt
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la s0, rt_interrupt_from_thread
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LOAD s1, 0(s0)
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STORE sp, 0(s1)
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la s0, rt_interrupt_to_thread
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LOAD s1, 0(s0)
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LOAD sp, 0(s1)
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#ifdef RT_USING_SMART
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mv a0, s1
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jal rt_thread_sp_to_thread
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jal lwp_aspace_switch
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#endif
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spurious_interrupt:
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RESTORE_ALL
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sret
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.global rt_hw_interrupt_enable
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rt_hw_interrupt_enable:
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csrs sstatus, a0 /* restore to old csr */
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jr ra
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.global rt_hw_interrupt_disable
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rt_hw_interrupt_disable:
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csrrci a0, sstatus, 2 /* clear SIE */
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jr ra
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