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42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
#ifndef _PAGING_H
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#define _PAGING_H
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#include <kernel.h>
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#define PHYS_ADDR(_a) ((_a) & ~0xFFF)
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// The kernels pagedir
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#define PAGEDIR ((uint32_t*)(0xFFFFF000))
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#define PAGETAB(_i) ((uint32_t*)(0xFFC00000 + ((_i) << 12)))
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#define PAGE_SIZE 4096
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#define PAGE_FLAG_PRESENT (1 << 0)
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#define PAGE_FLAG_WRITE (1 << 1)
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#define PAGE_FLAG_USER (1 << 2)
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#define PAGE_FLAG_PWT (1 << 3)
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#define PAGE_FLAG_NOCACHE (1 << 4)
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#define PAGE_FLAG_ACCESSED (1 << 5)
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#define PAGE_FLAG_DIRTY (1 << 6) // AVL in PDE where PS = 0
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#define PAGE_FLAG_PS (1 << 7) // If PS = 1 then directly maps a 4MB page
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#define PAGE_FLAG_GLOBAL (1 << 8)
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// bits 9-11 are AVL - OS is free to use these as its own flags
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#define PAGE_FLAG_OWNER (1 << 9)
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extern uint32_t init_pagedir[1024]; // Defined in entry.s for initial paging
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extern size_t pag_pageCount;
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int pag_init(void);
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void pag_registerTempFrame(uint32_t target);
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uint32_t pag_tempFrame(void);
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void pag_mapPage(uint32_t vaddr, uint32_t paddr, uint32_t flags);
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uint32_t pag_umapPage(uint32_t vaddr);
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void* pag_virtToPhys(uint32_t vaddr);
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uint32_t* pag_getPagedir();
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void pag_setPagedir(uint32_t* pagedir);
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void pag_syncPagedir();
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uint32_t* pag_allocPagedir();
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void pag_freePagedir(uint32_t* pagedir);
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#endif
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