arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c

File Facts

System

Linux kernel

Corpus path

arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c

Extension

.c

Size

3361 bytes

Lines

160

Domain

Architecture Layer

Bucket

arch/powerpc

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.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/slab.h
• linux/sysfs.h
• linux/errno.h
• linux/module.h
• linux/interrupt.h
• linux/device.h
• asm/mpic_timer.h
• asm/mpic.h

Detected Declarations

• struct fsl_mpic_timer_wakeup
• function fsl_free_resource
• function fsl_mpic_timer_irq
• function fsl_timer_wakeup_show
• function fsl_timer_wakeup_store
• function fsl_wakeup_sys_init
• function fsl_wakeup_sys_exit
• module init fsl_wakeup_sys_init

Annotated Snippet

module_init(fsl_wakeup_sys_init);
module_exit(fsl_wakeup_sys_exit);

MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/slab.h`, `linux/sysfs.h`, `linux/errno.h`, `linux/module.h`, `linux/interrupt.h`, `linux/device.h`, `asm/mpic_timer.h`.
• Detected declarations: `struct fsl_mpic_timer_wakeup`, `function fsl_free_resource`, `function fsl_mpic_timer_irq`, `function fsl_timer_wakeup_show`, `function fsl_timer_wakeup_store`, `function fsl_wakeup_sys_init`, `function fsl_wakeup_sys_exit`, `module init fsl_wakeup_sys_init`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.