arch/arm/include/asm/mpu.h

File Facts

System

Linux kernel

Corpus path

arch/arm/include/asm/mpu.h

Extension

.h

Size

3300 bytes

Lines

134

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.
• 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 mpu_rgn
• struct mpu_rgn_info
• function pmsav7_adjust_lowmem_bounds
• function pmsav8_adjust_lowmem_bounds
• function pmsav7_setup
• function pmsav8_setup

Annotated Snippet

struct mpu_rgn {
	/* Assume same attributes for d/i-side  */
	union {
		u32 drbar;   /* PMSAv7 */
		u32 prbar;   /* PMSAv8 */
	};
	union {
		u32 drsr;   /* PMSAv7 */
		u32 prlar;  /* PMSAv8 */
	};
	union {
		u32 dracr;  /* PMSAv7 */
		u32 unused; /* not used in PMSAv8 */
	};
};

struct mpu_rgn_info {
	unsigned int used;
	struct mpu_rgn rgns[MPU_MAX_REGIONS];
};
extern struct mpu_rgn_info mpu_rgn_info;

#ifdef CONFIG_ARM_MPU
extern void __init pmsav7_adjust_lowmem_bounds(void);
extern void __init pmsav8_adjust_lowmem_bounds(void);

extern void __init pmsav7_setup(void);
extern void __init pmsav8_setup(void);
#else
static inline void pmsav7_adjust_lowmem_bounds(void) {};
static inline void pmsav8_adjust_lowmem_bounds(void) {};
static inline void pmsav7_setup(void) {};
static inline void pmsav8_setup(void) {};
#endif

#endif /* __ASSEMBLY__ */

#endif

Annotation

• Detected declarations: `struct mpu_rgn`, `struct mpu_rgn_info`, `function pmsav7_adjust_lowmem_bounds`, `function pmsav8_adjust_lowmem_bounds`, `function pmsav7_setup`, `function pmsav8_setup`.
• Atlas domain: Architecture Layer / arch/arm.
• 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.