WebAug 14, 2024 · 芯片上电默认进入的是机器模式,通过将mstatus中的MPP值设置为00(00: User, 01: Supervisor, 11: Machine), 并将main函数的地址赋值给mepc,调用mret,使得用户在进入main函数运行时,芯片由机器模式切换为用户模式。 WebJul 30, 2024 · 执行该段代码,hart 0 不执行 // hart0 copy结束后,其它hart 跳转到_wait_for_boot_hart la t0, _start la t1, _link_start REG_L t1, 0(t1) beq t0, t1, _wait_for_boot_hart la t2, _boot_status sub t2, t2, t0 add t2, t2, t1 la t3, _wait_for_boot_hart // 转化成实际地址 sub t3, t3, t0 add t3, t3, t1 1: /* waitting for relocate ...
RISC-V MCU启动文件分析 -- 以CH32V103为例 - Wahahahehehe
WebMay 1, 2024 · It seems there is a bug in RISC-V port pxPortInitialiseStack(). In RISC-V port pxPortInitialiseStack() implementation, the mstatus value onto the stack is the current … Webla t0, __stack_end__ csrw CSR_MSCRATCH, t0. 1.把工程的桟底写入to寄存器. 2.然后通过csrw指令写入内核暂存寄存器CSR_MSCRATCH. LOAD sp, pxCurrentTCB LOAD sp, 0x0(sp) 1.把pxCurrentTCB赋予桟指正sp,而pxCurrentTCB就是任务,而任务结构体的第一项就是桟顶.这就对应起来了 how to scare pigeons from garden
uCOS/os_cpu_a.S at master · RISCV-on-Microsemi-FPGA/uCOS
WebExecute the mret instruction, after first setting up mstatus.mpp to S (01) and mepc to the address you want to start executing S mode from. To switch to U mode set mstatus.mpp … WebDec 13, 2024 · # 先初始化 li t0, (0b11 << 13) (0b11 << 11) (1 << 7) csrw mstatus, t0 la t1, kernel_init csrw mepc, t1 la t2, m_trap_vector csrw mtvec, t2 li t3, 0xaaa csrw mie, t3 la ra, 4f mret. 这里出现一个关键的指令 csrw 意思是写入状态控制寄存器。每个核心都有一系列状态控制寄存器,可以参考 RISCV 手册。 ... WebDec 27, 2024 · la supervisor, t0 csrw mepc, t0 mret Setting Up a Supervisor Trap Handler Link to heading. Similar to our mtrap routine in machine mode, we also need to setup a supervisor mode trap handler … how to scare pigeons away from bird feeder