arch/m68k/bvme6000/rtc.c

File Facts

System

Linux kernel

Corpus path

arch/m68k/bvme6000/rtc.c

Extension

.c

Size

4191 bytes

Lines

176

Domain

Architecture Layer

Bucket

arch/m68k

Inferred role

Architecture Layer: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h
• linux/errno.h
• linux/miscdevice.h
• linux/ioport.h
• linux/capability.h
• linux/fcntl.h
• linux/init.h
• linux/poll.h
• linux/module.h
• linux/rtc.h
• linux/bcd.h
• asm/bvme6000hw.h
• asm/io.h
• linux/uaccess.h
• asm/setup.h

Detected Declarations

• function rtc_ioctl
• function rtc_open
• function rtc_release
• function rtc_DP8570A_init
• module init rtc_DP8570A_init

Annotated Snippet

static const struct file_operations rtc_fops = {
	.unlocked_ioctl	= rtc_ioctl,
	.open		= rtc_open,
	.release	= rtc_release,
	.llseek		= noop_llseek,
};

static struct miscdevice rtc_dev = {
	.minor =	RTC_MINOR,
	.name =		"rtc",
	.fops =		&rtc_fops
};

static int __init rtc_DP8570A_init(void)
{
	if (!MACH_IS_BVME6000)
		return -ENODEV;

	pr_info("DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
	return misc_register(&rtc_dev);
}
module_init(rtc_DP8570A_init);

Annotation

• Immediate include surface: `linux/types.h`, `linux/errno.h`, `linux/miscdevice.h`, `linux/ioport.h`, `linux/capability.h`, `linux/fcntl.h`, `linux/init.h`, `linux/poll.h`.
• Detected declarations: `function rtc_ioctl`, `function rtc_open`, `function rtc_release`, `function rtc_DP8570A_init`, `module init rtc_DP8570A_init`.
• Atlas domain: Architecture Layer / arch/m68k.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.