arch/sh/include/asm/pgtable-2level.h

File Facts

System

Linux kernel

Corpus path

arch/sh/include/asm/pgtable-2level.h

Extension

.h

Size

567 bytes

Lines

25

Domain

Architecture Layer

Bucket

arch/sh

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

• asm-generic/pgtable-nopmd.h

Detected Declarations

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

Annotated Snippet

#ifndef __ASM_SH_PGTABLE_2LEVEL_H
#define __ASM_SH_PGTABLE_2LEVEL_H

#include <asm-generic/pgtable-nopmd.h>

/*
 * traditional two-level paging structure
 */
#define PAGETABLE_LEVELS	2

/* PTE bits */
#define PTE_MAGNITUDE		2	/* 32-bit PTEs */

#define PTE_SHIFT		PAGE_SHIFT
#define PTE_BITS		(PTE_SHIFT - PTE_MAGNITUDE)

/* PGD bits */
#define PGDIR_SHIFT		(PTE_SHIFT + PTE_BITS)

#define PTRS_PER_PGD		(PAGE_SIZE / (1 << PTE_MAGNITUDE))
#define USER_PTRS_PER_PGD	(TASK_SIZE/PGDIR_SIZE)

#endif /* __ASM_SH_PGTABLE_2LEVEL_H */

Annotation

• Immediate include surface: `asm-generic/pgtable-nopmd.h`.
• Atlas domain: Architecture Layer / arch/sh.
• 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.