arch/powerpc/sysdev/dart.h
Source file repositories/reference/linux-study-clean/arch/powerpc/sysdev/dart.h
File Facts
- System
- Linux kernel
- Corpus path
arch/powerpc/sysdev/dart.h- Extension
.h- Size
- 1568 bytes
- Lines
- 65
- 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 _POWERPC_SYSDEV_DART_H
#define _POWERPC_SYSDEV_DART_H
/* Offset from base to control register */
#define DART_CNTL 0
/* Offset from base to exception register */
#define DART_EXCP_U3 0x10
/* Offset from base to TLB tag registers */
#define DART_TAGS_U3 0x1000
/* U4 registers */
#define DART_BASE_U4 0x10
#define DART_SIZE_U4 0x20
#define DART_EXCP_U4 0x30
#define DART_TAGS_U4 0x1000
/* Control Register fields */
/* U3 registers */
#define DART_CNTL_U3_BASE_MASK 0xfffff
#define DART_CNTL_U3_BASE_SHIFT 12
#define DART_CNTL_U3_FLUSHTLB 0x400
#define DART_CNTL_U3_ENABLE 0x200
#define DART_CNTL_U3_SIZE_MASK 0x1ff
#define DART_CNTL_U3_SIZE_SHIFT 0
/* U4 registers */
#define DART_BASE_U4_BASE_MASK 0xffffff
#define DART_BASE_U4_BASE_SHIFT 0
#define DART_CNTL_U4_ENABLE 0x80000000
#define DART_CNTL_U4_IONE 0x40000000
#define DART_CNTL_U4_FLUSHTLB 0x20000000
#define DART_CNTL_U4_IDLE 0x10000000
#define DART_CNTL_U4_PAR_EN 0x08000000
#define DART_CNTL_U4_IONE_MASK 0x07ffffff
#define DART_SIZE_U4_SIZE_MASK 0x1fff
#define DART_SIZE_U4_SIZE_SHIFT 0
#define DART_REG(r) (dart + ((r) >> 2))
#define DART_IN(r) (in_be32(DART_REG(r)))
#define DART_OUT(r,v) (out_be32(DART_REG(r), (v)))
/* size of table in pages */
/* DART table fields */
#define DARTMAP_VALID 0x80000000
#define DARTMAP_RPNMASK 0x00ffffff
#define DART_PAGE_SHIFT 12
#define DART_PAGE_SIZE (1 << DART_PAGE_SHIFT)
#endif /* _POWERPC_SYSDEV_DART_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.