arch/x86/include/asm/memtype.h

File Facts

System

Linux kernel

Corpus path

arch/x86/include/asm/memtype.h

Extension

.h

Size

853 bytes

Lines

30

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.

Dependency Surface

• linux/types.h
• asm/pgtable_types.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef _ASM_X86_MEMTYPE_H
#define _ASM_X86_MEMTYPE_H

#include <linux/types.h>
#include <asm/pgtable_types.h>

extern bool pat_enabled(void);
extern void pat_bp_init(void);
extern void pat_cpu_init(void);

extern int memtype_reserve(u64 start, u64 end,
		enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
extern int memtype_free(u64 start, u64 end);

extern int memtype_kernel_map_sync(u64 base, unsigned long size,
		enum page_cache_mode pcm);

extern int memtype_reserve_io(resource_size_t start, resource_size_t end,
			enum page_cache_mode *pcm);

extern void memtype_free_io(resource_size_t start, resource_size_t end);

extern bool pat_pfn_immune_to_uc_mtrr(unsigned long pfn);

bool x86_has_pat_wp(void);
enum page_cache_mode pgprot2cachemode(pgprot_t pgprot);

#endif /* _ASM_X86_MEMTYPE_H */

Annotation

• Immediate include surface: `linux/types.h`, `asm/pgtable_types.h`.
• 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.