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71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
#ifndef MEMORY_VIRTUAL_H
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#define MEMORY_VIRTUAL_H
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#include <stdint.h>
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#include <memory/physical.h>
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#define PAGES_PER_TABLE 1024
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#define TABLES_PER_DIRECTORY 1024
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#define PAGE_SIZE 4096
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#define PD_INDEX(_vAddress) ((_vAddress) >> 22)
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#define PT_INDEX(_vAddress) (((_vAddress) >> 12) & 0x3ff)
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#define PAGE_PHYS_ADDRESS(_dirEntry) (*(_dirEntry) & ~ 0xfff)
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#define SET_ATTR(_entry, _attr) (*(_entry) |= (_attr))
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#define CLEAR_ATTR(_entry, _attr) (*(_entry) &= ~(_attr))
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#define TEST_ATTR(_entry, _attr) (*(_entry) & (_attr))
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#define SET_FRAME(_entry, _address) (*(_entry) = (*(_entry) & ~0xfffff000) | (_address))
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typedef uint32_t ptEntry_t;
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typedef uint32_t pdEntry_t;
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typedef enum {
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PTE_PRESENT = 0x01,
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PTE_READ_WRITE = 0x02,
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PTE_USER = 0x04,
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PTE_WRITE_THROUGH = 0x08,
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PTE_CACHE_DISABLE = 0x10,
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PTE_ACCESSED = 0x20,
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PTE_DIRTY = 0x40,
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PTE_PAT = 0x80,
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PTE_GLOBAL = 0x100,
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PTE_FRAME = 0x7ffff000,
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} PAGE_TABLE_FLAGS;
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typedef enum {
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PDE_PRESENT = 0x01,
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PDE_READ_WRITE = 0x02,
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PDE_USER = 0x04,
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PDE_WRITE_THROUGH = 0x08,
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PDE_CACHE_DISABLE = 0x10,
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PDE_ACCESSED = 0x20,
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PDE_DIRTY = 0x40, // Only with 4MB pages
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PDE_PAGE_SIZE = 0x80, // Is page 4MB
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PDE_GLOBAL = 0x100,
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PDE_PAT = 0x2000,
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PDE_FRAME = 0x7ffff000,
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} PAGE_DIR_FLAGS;
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typedef struct {
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ptEntry_t entries[PAGES_PER_TABLE];
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} pageTable_t;
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typedef struct {
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pdEntry_t entries[TABLES_PER_DIRECTORY];
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} pageDirectory_t;
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extern pageDirectory_t* currentPd;
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ptEntry_t* getPtEntry(pageTable_t* pt, uint32_t virtualAddress);
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pdEntry_t* getPdEntry(pageDirectory_t* pd, uint32_t virtualAddress);
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ptEntry_t* getPage(uint32_t virtualAddress);
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void* allocPage(ptEntry_t* page);
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void freePage(ptEntry_t* page);
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uint8_t setPageDirectory(pageDirectory_t* pd);
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void flushTlbEntry(uint32_t virtualAddress);
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uint8_t mapPage(void* physicalAddr, void* virtualAddr);
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void unmapPage(void* virtualAddress);
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uint8_t setupVirtualMemoryManager();
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#endif
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