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.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
Dependency Surface
asm-generic/delay.hlinux/time-internal.h
Detected Declarations
function um_ndelayfunction um_udelay
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
- Immediate include surface: `asm-generic/delay.h`, `linux/time-internal.h`.
- Detected declarations: `function um_ndelay`, `function um_udelay`.
- Atlas domain: Architecture Layer / arch/um.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.