arch/x86/include/asm/shared/msr.h

File Facts

System

Linux kernel

Corpus path

arch/x86/include/asm/shared/msr.h

Extension

.h

Size

680 bytes

Lines

31

Domain

Architecture Layer

Bucket

arch/x86

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• struct msr
• function rdmsr
• function raw_wrmsr

Annotated Snippet

struct msr {
	union {
		struct {
			u32 l;
			u32 h;
		};
		u64 q;
	};
};

/*
 * The kernel proper already defines rdmsr()/wrmsr(), but they are not for the
 * boot kernel since they rely on tracepoint/exception handling infrastructure
 * that's not available here.
 */
static inline void raw_rdmsr(unsigned int reg, struct msr *m)
{
	asm volatile("rdmsr" : "=a" (m->l), "=d" (m->h) : "c" (reg));
}

static inline void raw_wrmsr(unsigned int reg, const struct msr *m)
{
	asm volatile("wrmsr" : : "c" (reg), "a"(m->l), "d" (m->h) : "memory");
}

#endif /* _ASM_X86_SHARED_MSR_H */

Annotation

• Detected declarations: `struct msr`, `function rdmsr`, `function raw_wrmsr`.
• Atlas domain: Architecture Layer / arch/x86.
• 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.