50 lines
885 B
C
50 lines
885 B
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: Physical memory management
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* Author: Chloe M.
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*/
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#ifndef _MM_PM_H_
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#define _MM_PM_H_ 1
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#include <ptdef.h>
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#include <hal/page.h>
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/* Used when out of memory */
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#define PFN_ERROR 0
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/* Page frame number type */
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typedef USIZE MM_PFN;
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/*
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* These macros allow the conversion of page frame numbers
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* to physical addresses and vice versa.
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*/
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#define PFN_TO_ADDRESS(PFN) \
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((PFN) << LOG2_PAGESIZE)
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#define ADDRESS_TO_PFN(ADDR) \
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((ADDR) >> LOG2_PAGESIZE)
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/*
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* Initialize the physical memory management
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*/
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VOID MmPmInit(VOID);
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/*
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* Request a single frame of memory
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*
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* Returns PFN_ERROR on failure
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*/
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MM_PFN MmRequestFrame(VOID);
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/*
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* Reclaim a single frame of memory
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*
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* @Pfn: Page frame number to reclaim
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*/
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VOID MmReclaimFrame(MM_PFN Pfn);
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#endif /* !_MM_PM_H_ */
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