arch/powerpc/include/asm/pgtable-masks.h

File Facts

System

Linux kernel

Corpus path

arch/powerpc/include/asm/pgtable-masks.h

Extension

.h

Size

1139 bytes

Lines

33

Domain

Architecture Layer

Bucket

arch/powerpc

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

• 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 _ASM_POWERPC_PGTABLE_MASKS_H
#define _ASM_POWERPC_PGTABLE_MASKS_H

#ifndef _PAGE_NA
#define _PAGE_NA	0
#define _PAGE_NAX	_PAGE_EXEC
#define _PAGE_RO	_PAGE_READ
#define _PAGE_ROX	(_PAGE_READ | _PAGE_EXEC)
#define _PAGE_RW	(_PAGE_READ | _PAGE_WRITE)
#define _PAGE_RWX	(_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
#endif

/* Permission flags for kernel mappings */
#ifndef _PAGE_KERNEL_RO
#define _PAGE_KERNEL_RO		_PAGE_RO
#define _PAGE_KERNEL_ROX	_PAGE_ROX
#define _PAGE_KERNEL_RW		(_PAGE_RW | _PAGE_DIRTY)
#define _PAGE_KERNEL_RWX	(_PAGE_RWX | _PAGE_DIRTY)
#endif

/* Permission masks used to generate the __P and __S table */
#define PAGE_NONE	__pgprot(_PAGE_BASE | _PAGE_NA)
#define PAGE_EXECONLY_X	__pgprot(_PAGE_BASE | _PAGE_NAX)
#define PAGE_SHARED	__pgprot(_PAGE_BASE | _PAGE_RW)
#define PAGE_SHARED_X	__pgprot(_PAGE_BASE | _PAGE_RWX)
#define PAGE_COPY	__pgprot(_PAGE_BASE | _PAGE_RO)
#define PAGE_COPY_X	__pgprot(_PAGE_BASE | _PAGE_ROX)
#define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_RO)
#define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_ROX)

#endif /* _ASM_POWERPC_PGTABLE_MASKS_H */

Annotation

• Atlas domain: Architecture Layer / arch/powerpc.
• 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.