arch/um/include/asm/delay.h

Source file repositories/reference/linux-study-clean/arch/um/include/asm/delay.h

File Facts

System
Linux kernel
Corpus path
arch/um/include/asm/delay.h
Extension
.h
Size
670 bytes
Lines
31
Domain
Architecture Layer
Bucket
arch/um
Inferred role
Architecture Layer: implementation source
Status
source 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

#ifndef __UM_DELAY_H
#define __UM_DELAY_H
#include <asm-generic/delay.h>
#include <linux/time-internal.h>

static inline void um_ndelay(unsigned long nsecs)
{
	if (time_travel_mode == TT_MODE_INFCPU ||
	    time_travel_mode == TT_MODE_EXTERNAL) {
		time_travel_ndelay(nsecs);
		return;
	}
	ndelay(nsecs);
}
#undef ndelay
#define ndelay(n) um_ndelay(n)

static inline void um_udelay(unsigned long usecs)
{
	if (time_travel_mode == TT_MODE_INFCPU ||
	    time_travel_mode == TT_MODE_EXTERNAL) {
		time_travel_ndelay(1000 * usecs);
		return;
	}
	udelay(usecs);
}
#undef udelay
#define udelay(n) um_udelay(n)
#endif /* __UM_DELAY_H */

Annotation

Implementation Notes