arch/sh/include/asm/dma-register.h

File Facts

System

Linux kernel

Corpus path

arch/sh/include/asm/dma-register.h

Extension

.h

Size

1708 bytes

Lines

51

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

• 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 DMA_REGISTER_H
#define DMA_REGISTER_H

/* DMA registers */
#define SAR	0x00	/* Source Address Register */
#define DAR	0x04	/* Destination Address Register */
#define TCR	0x08	/* Transfer Count Register */
#define CHCR	0x0C	/* Channel Control Register */
#define DMAOR	0x40	/* DMA Operation Register */

/* DMAOR definitions */
#define DMAOR_AE	0x00000004	/* Address Error Flag */
#define DMAOR_NMIF	0x00000002
#define DMAOR_DME	0x00000001	/* DMA Master Enable */

/* Definitions for the SuperH DMAC */
#define REQ_L	0x00000000
#define REQ_E	0x00080000
#define RACK_H	0x00000000
#define RACK_L	0x00040000
#define ACK_R	0x00000000
#define ACK_W	0x00020000
#define ACK_H	0x00000000
#define ACK_L	0x00010000
#define DM_INC	0x00004000	/* Destination addresses are incremented */
#define DM_DEC	0x00008000	/* Destination addresses are decremented */
#define DM_FIX	0x0000c000	/* Destination address is fixed */
#define SM_INC	0x00001000	/* Source addresses are incremented */
#define SM_DEC	0x00002000	/* Source addresses are decremented */
#define SM_FIX	0x00003000	/* Source address is fixed */
#define RS_IN	0x00000200
#define RS_OUT	0x00000300
#define RS_AUTO	0x00000400	/* Auto Request */
#define RS_ERS	0x00000800	/* DMA extended resource selector */
#define TS_BLK	0x00000040
#define TM_BUR	0x00000020
#define CHCR_DE	0x00000001	/* DMA Enable */
#define CHCR_TE	0x00000002	/* Transfer End Flag */
#define CHCR_IE	0x00000004	/* Interrupt Enable */

#endif

Annotation

• 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.