arch/xtensa/mm/highmem.c

File Facts

System

Linux kernel

Corpus path

arch/xtensa/mm/highmem.c

Extension

.c

Size

1480 bytes

Lines

60

Domain

Architecture Layer

Bucket

arch/xtensa

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/export.h
• linux/highmem.h
• asm/tlbflush.h

Detected Declarations

• function kmap_waitqueues_init
• function kmap_idx
• function kmap_local_map_idx
• function kmap_local_unmap_idx
• function kmap_waitqueues_init

Annotated Snippet

static inline void kmap_waitqueues_init(void) { }
#endif

void __init kmap_init(void)
{
	/* Check if this memory layout is broken because PKMAP overlaps
	 * page table.
	 */
	BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE);
	kmap_waitqueues_init();
}

Annotation

• Immediate include surface: `linux/export.h`, `linux/highmem.h`, `asm/tlbflush.h`.
• Detected declarations: `function kmap_waitqueues_init`, `function kmap_idx`, `function kmap_local_map_idx`, `function kmap_local_unmap_idx`, `function kmap_waitqueues_init`.
• Atlas domain: Architecture Layer / arch/xtensa.
• 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.