43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#pragma once
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#define KERNBASE 0x80000000
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#define PGSIZE 0x1000
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#define PHYSTOP 0x8000000 // 128 Mib
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#define PGROUNDUP(sz) (((sz) + PGSIZE - 1) & ~(PGSIZE - 1))
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#define PGROUNDDOWN(a) (((a)) & ~((uintptr_t)(PGSIZE - 1)))
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#define NPDENTRIES 1024 // # directory entries per page directory
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#define NPTENTRIES 1024 // # PTEs per page table
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#define PTXSHIFT 12 // offset of PTX in a linear address
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#define PDXSHIFT 22 // offset of PDX in a linear address
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#define PXMASK 0x3FF
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#ifndef __ASSEMBLER__
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#include <stdint.h>
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#define V2P(a) (((uintptr_t)(a)) - KERNBASE)
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#define P2V(a) ((void *)(((uintptr_t)(a)) + KERNBASE))
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// page directory index
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#define PDX(va) (((uintptr_t)(va) >> PDXSHIFT) & PXMASK)
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// page table index
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#define PTX(va) (((uintptr_t)(va) >> PTXSHIFT) & PXMASK)
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// Address in page table or page directory entry
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#define PTE_ADDR(pte) ((uintptr_t)(pte) & ~0xFFF)
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#endif
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// Page table/directory entry flags.
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#define PTE_P 0x001 // Present
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#define PTE_W 0x002 // Writeable
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#define PTE_U 0x004 // User
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#define PTE_PWT 0x008 // Write-Through
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#define PTE_PCD 0x010 // Cache-Disable
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#define PTE_A 0x020 // Accessed
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#define PTE_D 0x040 // Dirty
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// entries of page tables don't have PS
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#define PDE_PS 0x080 // Page Size
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