arch/arm/include/asm/mmu.h

File Facts

System

Linux kernel

Corpus path

arch/arm/include/asm/mmu.h

Extension

.h

Size

949 bytes

Lines

50

Domain

Architecture Layer

Bucket

arch/arm

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.

Dependency Surface

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

Detected Declarations

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

Annotated Snippet

#ifndef __ARM_MMU_H
#define __ARM_MMU_H

#ifdef CONFIG_MMU

typedef struct {
#ifdef CONFIG_CPU_HAS_ASID
	atomic64_t	id;
#else
	int		switch_pending;
#endif
	atomic_t	vmalloc_seq;
	unsigned long	sigpage;
#ifdef CONFIG_VDSO
	unsigned long	vdso;
#endif
#ifdef CONFIG_BINFMT_ELF_FDPIC
	unsigned long	exec_fdpic_loadmap;
	unsigned long	interp_fdpic_loadmap;
#endif
} mm_context_t;

#ifdef CONFIG_CPU_HAS_ASID
#define ASID_BITS	8
#define ASID_MASK	((~0ULL) << ASID_BITS)
#define ASID(mm)	((unsigned int)((mm)->context.id.counter & ~ASID_MASK))
#else
#define ASID(mm)	(0)
#endif

#else

/*
 * From nommu.h:
 *  Copyright (C) 2002, David McCullough <davidm@snapgear.com>
 *  modified for 2.6 by Hyok S. Choi <hyok.choi@samsung.com>
 */
typedef struct {
	unsigned long	end_brk;
#ifdef CONFIG_BINFMT_ELF_FDPIC
	unsigned long	exec_fdpic_loadmap;
	unsigned long	interp_fdpic_loadmap;
#endif
} mm_context_t;

#endif

#endif

Annotation

• Atlas domain: Architecture Layer / arch/arm.
• Implementation status: source implementation candidate.
• 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.