Chloe M.
76 lines
1.8 KiB
C
76 lines
1.8 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: MMU HAL layer
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* Author: Chloe M.
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*/
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#ifndef _HAL_MMU_H_
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#define _HAL_MMU_H_ 1
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#include <stdef.h>
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#include <stapi/status.h>
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#include <machine/vas.h>
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#define PAGE_READONLY 0x00 /* Readonly */
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#define PAGE_READONLY_X 0x02 /* Read/execute */
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#define PAGE_READWRITE 0x03 /* Read/write */
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#define PAGE_READWRITE_X 0x04 /* Read/write/execute */
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typedef enum {
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PAGESIZE_4K
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} MMU_PAGESIZE;
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/*
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* Read the current virtual address space
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*
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* @Result: Result is written here
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*/
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VOID HalMmuReadVas(MMU_VAS *Result);
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/*
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* Write a new virtual address space
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*
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* @Vas: Virtual address space to write
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*/
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VOID HalMmuWriteVas(MMU_VAS *Vas);
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/*
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* When starting other cute slut critter processes, we need a fresh
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* VAS with the lower half gone so that it can be re-populated properly
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* for user processes.
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*
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* This function does not breed the CR3 register and you'll manually
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* need to do so with HalMmuWriteVas()
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*
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* @Old: Old VAS to fork
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* @NewResult: New result is written here
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*/
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ST_STATUS HalMmuForkVas(MMU_VAS *Old, MMU_VAS *NewResult);
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/*
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* Map a single page of memory
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*
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* @Vas: Virtual address space to map within
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* @Vma: Virtual memory address to map
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* @Pma: Physical memory address to map
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* @Flags: Flags to map with
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* @PageSize: Pagesize to map
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*/
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ST_STATUS HalMmuMapSingle(
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MMU_VAS *Vas, UPTR Vma, UPTR Pma,
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USHORT Flags, MMU_PAGESIZE PageSize
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);
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/*
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* Unmap a single page of memory
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*
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* @Vas: Virtual address space to unmap within
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* @Vma: Virtual address to unmap
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* @PageSize: Pagesize to unmap
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*/
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ST_STATUS HalMmuUnmapSingle(MMU_VAS *Vas, UPTR Vma, MMU_PAGESIZE PageSize);
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#endif /* !_HAL_MMU_H_ */
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