再举一例,在linux进程切换的最后,也有显式的调用DSB指令: schedule-->__schedule-->context_switch-->switch_to-->__switch_to<arch/arm64/kernel/process.c>494/*495 * Thread switching.496 */497__notrace_funcgraphstructtask_struct*__switch_to(structtask_struct*prev,498structtask_struct*next)499...
上述函数会创建新进程,在内核栈中预留pt_regs大小的空间,用来设置用户空间所需要的寄存器,新创建的进程被唤醒最终通过cpu_switch_to切换: AI检测代码解析 //x0 是prev ,x1是next 任务 ENTRY(cpu_switch_to) mov x10, #THREAD_CPU_CONTEXT // 寄存器x10存放thread.cpu_context偏移 add x8, x0, x10 //x8上...
2.6 C运行时环境初始化(__primary_switch ) _primary_switch主要用于设置c运行时环境,如使能MMU,设置异常向量表,栈,BSS段等,最后跳转到C语言函数start_kernel 。该函数具体实现如下,我们暂且跳过与主流程关联较小的kaslr和内核重定向相关代码。 SYM_FUNC_START_LOCAL(__primary_switch)// __primary_switch...
bl switch_to_vhe bl __cpu_setup adrp x1, swapper_pg_dir bl __enable_mmu ldr x8, =_cpu_resume br x8 SYM_CODE_END(cpu_resume) 该函数先执行一些基础的cpu初始化工作(与系统启动流程类似,感兴趣的同学可参考<聊聊soc启动(十一) 内核初始化>一文),然后调用_cpu_resume恢复cpu的上下文。其定义如下:...
¦* structure prior to the last ERET from EL3. ¦*/ldr x12,[x6,#CTX_EL3STATE_OFFSET+CTX_RUNTIME_SP]/* ¦* Any index greater than 127 is invalid. Check bit 7 for ¦* a valid index ¦*/tbnz w15,7,smc_unknown/* Switch to SP_EL0 */msr spsel,#0/* ...
context_switch(struct rq *rq, struct task_struct *prev, struct task_struct *next, struct rq_flags *rf) { if (!next->mm) { // to kernel enter_lazy_tlb(prev->active_mm, next); next->active_mm = prev->active_mm; if (prev->mm) // from user ...
* On return, the CPU will be ready for the MMU to be turned on and * the TCR will have been set. */ bl __cpu_setup// initialise processor b __primary_switch SYM_CODE_END(primary_entry) 2.1 preserve_boot_args 功能:把bootloader传进来的x0 .. x3保存到boot_args数组中。
When opening rancher-desktop it still requires to install Rosetta 2 Steps to Reproduce Download rancher desktop from:https://github.com/rancher-sandbox/rancher-desktop/releases/download/v1.0.0/Rancher.Desktop-1.0.0.aarch64.dmg Copy the app to the Applications folder ...
1longpsci_call(unsigned long fid,unsigned long arg1,unsigned long arg2)2{3switch(fid){4casePSCI_CPU_OFF:5returnpsci_cpu_off();67casePSCI_CPU_ON_64:8returnpsci_cpu_on(arg1,arg2);910default:11returnPSCI_RET_NOT_SUPPORTED;12}13}
33 * Send an event to wake up the secondary CPU. 34 */35sev();3637iounmap(release_addr);3839return0;40} Bootloader部分以boot-wrapper-aarch64中的代码做示例,非主 CPU 会轮询检查 mbox(其地址等同cpu-release-addr)中的值,当其值为 0 的时候继续睡眠,否则就跳转到内核执行,代码如下所示: ...