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: //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上个进程描述符的...
PID:88TASK: ffffff80a7e89200 CPU:2COMMAND:"wq_dump"#0 [ffffffc00b773d00] __switch_to at ffffffc00808b298#1 [ffffffc00b773d60] __schedule at ffffffc0098266d4#2 [ffffffc00b773dc0] schedule at ffffffc009826d90#3 [ffffffc00b773e10] rescuer_thread at ffffffc008176e90#4 [fffff...
516 */ 517 dsb(ish); 518 519 /* the actual thread switch */ 520 last = cpu_switch_to(prev, next); 521 522 return last; 523 } 517行的dsb指令是在等502--509行中的TLB和高速缓存维护指令完成,在保证完成的基础上在执行520行做最后的寄存器切换,这是为了防止被调度的进程被迁移到其他core上...
1static intcpu_psci_cpu_boot(unsigned int cpu)2{3phys_addr_t pa_secondary_entry=__pa_symbol(function_nocfi(secondary_entry));4int err=psci_ops.cpu_on(cpu_logical_map(cpu),pa_secondary_entry);5if(err)6pr_err("failed to bootCPU%d(%d)\n",cpu,err);78returnerr;9}1011static unsigned...
* 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。
6. 进程切换只会发生在内核态,即进程切换只需要考虑内核态的寄存器上下文切换,见schedule->__schedule->switch_to->cpu_switch_to中,将当前的regs保存到current->thread->context,同时恢复nex taskt的regs; 7. 发生系统调用/异常时,需要保存用户态/内核态的寄存器上下文,此时通过kernel_entry,将用户态/内核态的reg...
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: 1/** 2* Wait for an address to appear in mbox, and jump to it. ...
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: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1/** 2 * Wait for an address to appear in mbox, and jump to...
1: to user //切换用户进程需要切换内存 switch_mm_irqs_off(=switch_mm) arg:next __switch_mm check_and_switch_context cpu_switch_mm static inline void cpu_switch_mm(pgd_t *pgd, struct mm_struct *mm) { BUG_ON(pgd == swapper_pg_dir); ...
[ 1969.689180] Task dump for CPU 2: [ 1969.770725] task:weston state:R running task stack: 0 pid: 145 ppid: 133 flags:0x0000000f [ 1970.150921] Call trace: [ 1970.246591] __switch_to+0xb4/0xec [ 1970.344106] 0xffff000002cb1d00 [ 1970.437906] Task dump for CPU 1: [ 1970.528765] ...