arch/xtensa/platforms/xt2000/include/platform/serial.h

File Facts

System

Linux kernel

Corpus path

arch/xtensa/platforms/xt2000/include/platform/serial.h

Extension

.h

Size

762 bytes

Lines

29

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

• asm/core.h
• asm/io.h

Detected Declarations

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

Annotated Snippet

#ifndef _XTENSA_XT2000_SERIAL_H
#define _XTENSA_XT2000_SERIAL_H

#include <asm/core.h>
#include <asm/io.h>

/*  National-Semi PC16552D DUART:  */

#define DUART16552_1_INTNUM	XCHAL_EXTINT4_NUM
#define DUART16552_2_INTNUM	XCHAL_EXTINT5_NUM

#define DUART16552_1_ADDR	IOADDR(0x0d050020)	/* channel 1 */
#define DUART16552_2_ADDR	IOADDR(0x0d050000)	/* channel 2 */

#define DUART16552_XTAL_FREQ	18432000	/* crystal frequency in Hz */
#define BASE_BAUD ( DUART16552_XTAL_FREQ / 16 )

#endif /* _XTENSA_XT2000_SERIAL_H */

Annotation

• Immediate include surface: `asm/core.h`, `asm/io.h`.
• 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.