Chloe M.
103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: Pool allocator
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* Author: Chloe M.
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*/
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#ifndef _EX_POOL_H_
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#define _EX_POOL_H_ 1
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#include <hal/page.h>
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#include <stapi/status.h>
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#include <stdef.h>
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/* Minimum log2 allocation size */
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#define POOL_MIN_LOG2 3
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/* Compute the granularity of a specific level */
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#define LEVEL_GRAN(LEVEL) \
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(1 << (POOL_MIN_LOG2 + (LEVEL)))
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/* Maximum levels per pool */
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#define LEVEL_COUNT 8
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/*
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* When allocating pages, we sacrifice a little bit of its
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* first bytes to store some metadata. This is the true size
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* of unreserved / usable data.
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*/
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#define POOL_REAL_PAGESZ \
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(PAGESIZE - sizeof(MEMORY_PAGE))
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/*
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* Valid pool types
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*
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* @POOL_NON_PAGED: Not pagable to disk
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*/
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typedef enum {
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POOL_NON_PAGED
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} POOL_TYPE;
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/*
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* Page data structure used internally to link together page
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* lists
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*
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* @Bitmap: Bitmap to data [0 : free, 1 : allocated]
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* @Next: Next page in list
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*/
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typedef struct _MEMORY_PAGE {
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UQUAD Bitmap;
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struct _MEMORY_PAGE *Next;
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} MEMORY_PAGE;
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/*
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* A memory block holds a list of memory chunks of a specific
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* granularity.
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*
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* @FirstPage: First page in list
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* @LastPage: Last page in list
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* @PageCount: Number of pages total
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*/
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typedef struct {
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MEMORY_PAGE *FirstPage;
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MEMORY_PAGE *LastPage;
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USIZE PageCount;
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} MEMORY_BLOCK;
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/*
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* A memory pool holds blocks of varying granularities
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*
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* @BlockLevels: Block levels [granularity : GRAN(level)]
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* @Id: Pool ID
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*/
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typedef struct {
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MEMORY_BLOCK BlockLevels[LEVEL_COUNT];
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USIZE Id;
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} MEMORY_POOL;
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/*
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* Initialize a memory pool
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*
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* @Pool: Memory pool to initialize
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*/
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ST_STATUS ExPoolInit(MEMORY_POOL *Pool);
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/*
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* Allocate a tagged pool
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*
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* @Type: Pool type
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* @ByteCount: Number of bytes to allocate
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* @Tag: Tag to assign to pool
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*
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* Returns the memory base on success, otherwise
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* NULL on failure.
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*/
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VOID *ExAllocatePoolWithTag(
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POOL_TYPE Type, USIZE ByteCount,
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ULONG Tag
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);
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#endif /* !_EX_POOL_H_ */
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