74 lines
2.8 KiB
C
74 lines
2.8 KiB
C
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// smallsegment_v6_box.h - SmallSegment v6 型定義（Phase v6-2）
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#ifndef HAKMEM_SMALLSEGMENT_V6_BOX_H
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#define HAKMEM_SMALLSEGMENT_V6_BOX_H
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#include <stdint.h>
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// Segment constants
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#define SMALL_SEGMENT_V6_SIZE (2 * 1024 * 1024) // 2 MiB
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#define SMALL_PAGE_V6_SIZE (64 * 1024) // 64 KiB
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#define SMALL_PAGES_PER_SEGMENT (SMALL_SEGMENT_V6_SIZE / SMALL_PAGE_V6_SIZE) // 32
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#define SMALL_SEGMENT_V6_MAGIC 0xC06E56u // C0(re) v6
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#define SMALL_PAGE_V6_SHIFT 16 // log2(64KiB)
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// C6 configuration
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#define SMALL_V6_C6_CLASS_IDX 6
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#define SMALL_V6_C6_BLOCK_SIZE 512
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// Page index calculation macro (requires 'seg' variable in scope)
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#define SMALL_V6_PAGE_IDX(seg, addr) (((uintptr_t)(addr) - (seg)->base) >> SMALL_PAGE_V6_SHIFT)
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// Forward declaration
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typedef struct SmallPageMetaV6 SmallPageMetaV6;
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// Page metadata
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typedef struct SmallPageMetaV6 {
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void* free_list; // freelist head (block先頭をnextとして使う)
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uint16_t used; // 現在使用中スロット数
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uint16_t capacity; // ページ内スロット数
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uint8_t class_idx; // サイズクラス
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uint8_t flags; // FULL / PARTIAL / REMOTE_PENDING など
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uint16_t page_idx; // Segment 内 index
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void* segment; // SmallSegmentV6* への backpointer
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} SmallPageMetaV6;
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// Segment structure
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typedef struct SmallSegmentV6 {
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uintptr_t base; // Segment base address
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uint32_t num_pages; // Number of pages (typically 32)
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uint32_t owner_tid; // Owner thread ID
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uint32_t magic; // 0xC0REV6 for validation
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SmallPageMetaV6 page_meta[SMALL_PAGES_PER_SEGMENT];
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} SmallSegmentV6;
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// ============================================================================
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// Inline Helper Functions
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// ============================================================================
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/// Check if page is valid and active
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static inline int small_page_v6_valid(SmallPageMetaV6* page) {
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return page != NULL && page->capacity > 0;
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}
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/// Check if pointer is within segment bounds
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static inline int small_ptr_in_segment_v6(SmallSegmentV6* seg, void* ptr) {
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uintptr_t addr = (uintptr_t)ptr;
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return addr >= seg->base && addr < seg->base + SMALL_SEGMENT_V6_SIZE;
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}
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/// Check if segment is valid and initialized
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static inline int small_segment_v6_valid(SmallSegmentV6* seg) {
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return seg != NULL && seg->magic == SMALL_SEGMENT_V6_MAGIC;
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}
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// ============================================================================
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// API
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// ============================================================================
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SmallSegmentV6* small_segment_v6_acquire_for_thread(void);
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void small_segment_v6_release(SmallSegmentV6* seg);
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SmallPageMetaV6* small_page_meta_v6_of(void* ptr);
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#endif // HAKMEM_SMALLSEGMENT_V6_BOX_H
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