MAJOR RESTRUCTURE

2026-11-04 02:23:10 +00:00 · 2024-12-28 21:23:58 +01:00
parent 12b07a9f70
commit 2e0b030324
81 changed files with 1168 additions and 579 deletions
@@ -0,0 +1,70 @@
+#ifndef _MEMORY_VIRTUAL_H
+#define _MEMORY_VIRTUAL_H
+
+#include <memory/physical.h>
+#include <stdint.h>
+
+#define PAGES_PER_TABLE 1024
+#define TABLES_PER_DIRECTORY 1024
+#define PAGE_SIZE 4096
+
+#define PD_INDEX(_vAddress) ((_vAddress) >> 22)
+#define PT_INDEX(_vAddress) (((_vAddress) >> 12) & 0x3ff)
+#define PAGE_PHYS_ADDRESS(_dirEntry) (*(_dirEntry) & ~ 0xfff)
+#define SET_ATTR(_entry, _attr) (*(_entry) |= (_attr))
+#define CLEAR_ATTR(_entry, _attr) (*(_entry) &= ~(_attr))
+#define TEST_ATTR(_entry, _attr) (*(_entry) & (_attr))
+#define SET_FRAME(_entry, _address) (*(_entry) = (*(_entry) & ~0xfffff000) | (_address))
+
+typedef uint32_t ptEntry_t;
+typedef uint32_t pdEntry_t;
+
+typedef enum {
+    PTE_PRESENT         = 0x01,
+    PTE_READ_WRITE      = 0x02,
+    PTE_USER            = 0x04,
+    PTE_WRITE_THROUGH   = 0x08,
+    PTE_CACHE_DISABLE   = 0x10,
+    PTE_ACCESSED        = 0x20,
+    PTE_DIRTY           = 0x40,
+    PTE_PAT             = 0x80,
+    PTE_GLOBAL          = 0x100,
+    PTE_FRAME           = 0x7ffff000,
+} PAGE_TABLE_FLAGS;
+
+typedef enum {
+    PDE_PRESENT         = 0x01,
+    PDE_READ_WRITE      = 0x02,
+    PDE_USER            = 0x04,
+    PDE_WRITE_THROUGH   = 0x08,
+    PDE_CACHE_DISABLE   = 0x10,
+    PDE_ACCESSED        = 0x20,
+    PDE_DIRTY           = 0x40, // Only with 4MB pages
+    PDE_PAGE_SIZE       = 0x80, // Is page 4MB
+    PDE_GLOBAL          = 0x100,
+    PDE_PAT             = 0x2000,
+    PDE_FRAME           = 0x7ffff000,
+} PAGE_DIR_FLAGS;
+
+typedef struct {
+    ptEntry_t entries[PAGES_PER_TABLE];
+} pageTable_t;
+
+typedef struct {
+    pdEntry_t entries[TABLES_PER_DIRECTORY];
+} pageDirectory_t;
+
+extern pageDirectory_t* currentPd;
+
+ptEntry_t* getPtEntry(pageTable_t* pt, uint32_t virtualAddress);
+pdEntry_t* getPdEntry(pageDirectory_t* pd, uint32_t virtualAddress);
+ptEntry_t* getPage(uint32_t virtualAddress);
+void* allocPage(ptEntry_t* page);
+void freePage(ptEntry_t* page);
+uint8_t setPageDirectory(pageDirectory_t* pd);
+void flushTlbEntry(uint32_t virtualAddress);
+uint8_t mapPage(void* physicalAddr, void* virtualAddr);
+void unmapPage(void* virtualAddress);
+uint8_t setupVirtualMemoryManager();
+
+#endif