arch/csky/kernel/process.c

Source file repositories/reference/linux-study-clean/arch/csky/kernel/process.c

File Facts

System
Linux kernel
Corpus path
arch/csky/kernel/process.c
Extension
.c
Size
2444 bytes
Lines
105
Domain
Architecture Layer
Bucket
arch/csky
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

void flush_thread(void){}

int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
{
	u64 clone_flags = args->flags;
	unsigned long usp = args->stack;
	unsigned long tls = args->tls;
	struct switch_stack *childstack;
	struct pt_regs *childregs = task_pt_regs(p);

#ifdef CONFIG_CPU_HAS_FPU
	save_to_user_fp(&p->thread.user_fp);
#endif

	childstack = ((struct switch_stack *) childregs) - 1;
	memset(childstack, 0, sizeof(struct switch_stack));

	/* setup thread.sp for switch_to !!! */
	p->thread.sp = (unsigned long)childstack;

	if (unlikely(args->fn)) {
		memset(childregs, 0, sizeof(struct pt_regs));
		childstack->r15 = (unsigned long) ret_from_kernel_thread;
		childstack->r10 = (unsigned long) args->fn_arg;
		childstack->r9 = (unsigned long) args->fn;
		childregs->sr = mfcr("psr");
	} else {
		*childregs = *(current_pt_regs());
		if (usp)
			childregs->usp = usp;
		if (clone_flags & CLONE_SETTLS)
			task_thread_info(p)->tp_value = childregs->tls
						      = tls;

		childregs->a0 = 0;
		childstack->r15 = (unsigned long) ret_from_fork;
	}

	return 0;
}

/* Fill in the fpu structure for a core dump.  */
int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
{
	memcpy(fpu, &current->thread.user_fp, sizeof(*fpu));
	return 1;
}

int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
{
	struct pt_regs *regs = task_pt_regs(tsk);

	/* NOTE: usp is error value. */
	ELF_CORE_COPY_REGS((*pr_regs), regs)

	return 1;
}

#ifndef CONFIG_CPU_PM_NONE
void arch_cpu_idle(void)
{
#ifdef CONFIG_CPU_PM_WAIT
	asm volatile("wait\n");
#endif

#ifdef CONFIG_CPU_PM_DOZE
	asm volatile("doze\n");
#endif

#ifdef CONFIG_CPU_PM_STOP
	asm volatile("stop\n");
#endif
}
#endif

Annotation

Implementation Notes