arch/sparc/include/asm/iommu_64.h
Source file repositories/reference/linux-study-clean/arch/sparc/include/asm/iommu_64.h
File Facts
- System
- Linux kernel
- Corpus path
arch/sparc/include/asm/iommu_64.h- Extension
.h- Size
- 2489 bytes
- Lines
- 94
- Domain
- Architecture Layer
- Bucket
- arch/sparc
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
asm/iommu-common.h
Detected Declarations
struct iommu_arenastruct atu_iotsbstruct atu_rangesstruct atustruct iommustruct strbuf
Annotated Snippet
struct iommu_arena {
unsigned long *map;
unsigned int hint;
unsigned int limit;
};
#define ATU_64_SPACE_SIZE 0x800000000 /* 32G */
/* Data structures for SPARC ATU architecture */
struct atu_iotsb {
void *table; /* IOTSB table base virtual addr*/
u64 ra; /* IOTSB table real addr */
u64 dvma_size; /* ranges[3].size or OS slected 32G size */
u64 dvma_base; /* ranges[3].base */
u64 table_size; /* IOTSB table size */
u64 page_size; /* IO PAGE size for IOTSB */
u32 iotsb_num; /* tsbnum is same as iotsb_handle */
};
struct atu_ranges {
u64 base;
u64 size;
};
struct atu {
struct atu_ranges *ranges;
struct atu_iotsb *iotsb;
struct iommu_map_table tbl;
u64 base;
u64 size;
u64 dma_addr_mask;
};
struct iommu {
struct iommu_map_table tbl;
struct atu *atu;
spinlock_t lock;
u32 dma_addr_mask;
iopte_t *page_table;
unsigned long iommu_control;
unsigned long iommu_tsbbase;
unsigned long iommu_flush;
unsigned long iommu_flushinv;
unsigned long iommu_tags;
unsigned long iommu_ctxflush;
unsigned long write_complete_reg;
unsigned long dummy_page;
unsigned long dummy_page_pa;
unsigned long ctx_lowest_free;
DECLARE_BITMAP(ctx_bitmap, IOMMU_NUM_CTXS);
};
struct strbuf {
int strbuf_enabled;
unsigned long strbuf_control;
unsigned long strbuf_pflush;
unsigned long strbuf_fsync;
unsigned long strbuf_err_stat;
unsigned long strbuf_tag_diag;
unsigned long strbuf_line_diag;
unsigned long strbuf_ctxflush;
unsigned long strbuf_ctxmatch_base;
unsigned long strbuf_flushflag_pa;
volatile unsigned long *strbuf_flushflag;
volatile unsigned long __flushflag_buf[(64+(64-1)) / sizeof(long)];
};
int iommu_table_init(struct iommu *iommu, int tsbsize,
u32 dma_offset, u32 dma_addr_mask,
int numa_node);
#endif /* !(_SPARC64_IOMMU_H) */
Annotation
- Immediate include surface: `asm/iommu-common.h`.
- Detected declarations: `struct iommu_arena`, `struct atu_iotsb`, `struct atu_ranges`, `struct atu`, `struct iommu`, `struct strbuf`.
- Atlas domain: Architecture Layer / arch/sparc.
- 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.