feat: vmm; solved rectest() issue

kernel/include/pmm.h

@@ -1,19 +1,22 @@
 #ifndef PMM_H
 #define PMM_H
 
-#include "types.h"
 #include "../common/bootinfo.h"
 
 #define PAGE_SIZE 4096
 #define BLOCKS_PER_BYTE 8
 
+#define SAFE_SPACE_START_ADDR 0x100000
+
 #define BITMAP_BYTE_INDEX(addr)  ((addr / PAGE_SIZE) / BLOCKS_PER_BYTE)
 #define BITMAP_BIT_OFFSET(addr)  ((addr / PAGE_SIZE) % BLOCKS_PER_BYTE)
 #define BITMAP_TEST(bitmap, addr)  (bitmap[BITMAP_BYTE_INDEX(addr)] & (1 << BITMAP_BIT_OFFSET(addr)))
 #define BITMAP_SET(bitmap, addr)   (bitmap[BITMAP_BYTE_INDEX(addr)] |= (1 << BITMAP_BIT_OFFSET(addr)))
 #define BITMAP_UNSET(bitmap, addr) (bitmap[BITMAP_BYTE_INDEX(addr)] &= ~(1 << BITMAP_BIT_OFFSET(addr)))
 
-void pmm_init(BI_MemoryMap mmap);
-u8* get_bitmap();
+void  pmm_init(BI_MemoryMap mmap);
+void* pmm_alloc_page();
+void  pmm_free_page(void* addr);
+
 
 #endif

kernel/include/vmm.h

@@ -0,0 +1,31 @@
+#ifndef VMM_H
+#define VMM_H
+
+#include "../common/bootinfo.h"
+#include "types.h"
+
+#define PTE_PRESENT  (1ULL << 0)    // 0 -- not present: page fault when trying to access; 1 -- present, can RW
+#define PTE_RW       (1ULL << 1)    // 0 -- RO: page fault trying to write; 1 -- RW
+#define PTE_USER     (1ULL << 2)    // 0 -- Ring 0: R3 get segfault gtrying to access; 1 -- Ring 3
+#define PTE_PWT      (1ULL << 3)    // 1 -- skip L1/L2 cache when writing to RAM
+#define PTE_PCD      (1ULL << 4)    // 1 -- cache disabled for page
+#define PTE_ACCESSED (1ULL << 5)    // CPU sets it (by itself) to 1 when RW this page
+#define PTE_DIRTY    (1ULL << 6)    // CPU sets it when writing to this page
+#define PTE_NX       (1ULL << 63)   // No execute
+
+
+#define PTE_ADDR_MASK 0x000FFFFFFFFFF000 // mask to get clean physical addres that located at bits 12-51
+
+#define PTE_GET_ADDR(entry)  ((entry) & PTE_ADDR_MASK)  // get physical address
+#define PTE_GET_FLAGS(entry) ((entry) & ~PTE_ADDR_MASK) // get flags
+
+
+#define VMM_PT_INDEX(virt)   (((virt) >> 12) & 0x1FF) // Table Index (bits 12-20)
+#define VMM_PD_INDEX(virt)   (((virt) >> 21) & 0x1FF) // Page Directory Index (bits 21-29) 
+#define VMM_PDPT_INDEX(virt) (((virt) >> 30) & 0x1FF) // PDPT Index (bits 30-38)
+#define VMM_PML4_INDEX(virt) (((virt) >> 39) & 0x1FF) // PML4 Index (bits 39-47): main page
+
+void vmm_init(Bootinfo* info);
+void vmm_map_page(u64* pml4, u64 phys, u64 virt, u64 flags);
+
+#endif