diff options
Diffstat (limited to 'kernel/include/mm')
| -rw-r--r-- | kernel/include/mm/virtual_mm.h | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/kernel/include/mm/virtual_mm.h b/kernel/include/mm/virtual_mm.h index 3f938d2..ad2b961 100644 --- a/kernel/include/mm/virtual_mm.h +++ b/kernel/include/mm/virtual_mm.h @@ -29,20 +29,22 @@ #define PAGE_DIRECTORY_INDEX(virtual_address) ((virtual_address >> 22) & 0x3ff) #define PAGE_TABLE_INDEX(virtual_address) ((virtual_address >> 12) & 0x3ff) -#define PDE_PRESENT 1 -#define PDE_WRITABLE (1 << 1) -#define PDE_USER (1 << 2) -#define PDE_WRITETHROUGH (1 << 3) -#define PDE_CACHE_DISABLE (1 << 4) -#define PDE_ACCESSED (1 << 5) +#define SET_PDE_PRESENT(x) x +#define SET_PDE_WRITABLE(x) (x << 1) +#define SET_PDE_USER(x) (x << 2) +#define SET_PDE_WRITETHROUGH(x) (x << 3) +#define SET_PDE_CACHE_DISABLE(x) (x << 4) +#define SET_PDE_ACCESSED(x) (x << 5) /* Never set (reserved by Intel) */ -#define PDE_RESERVED (0 << 6) -#define PDE_PAGE_SIZE (1 << 7) -#define PDE_GLOBAL (1 << 8) +#define SET_PDE_RESERVED(x) (x << 6) +#define SET_PDE_PAGE_SIZE(x) (x << 7) +#define SET_PDE_GLOBAL(x) (x << 8) /* NOTE: Unused by the CPU, free to be used by us! */ -#define PDE_UNUSED(x) (x << 9) +#define SET_PDE_UNUSED(x) (x << 9) /* Page table address */ -#define PDE_FRAME(x) (x << 11) +#define SET_PDE_FRAME(x) (x << 11) + +#define GET_PDE_FRAME(x) (*x >> 11) #define SET_PTE_PRESENT(x) x #define SET_PTE_WRITABLE(x) (x << 1) @@ -58,6 +60,7 @@ /* MAX: 0xFFFFF000 */ #define SET_PTE_FRAME(x) (x << 11) +#define PTE_IS_PRESENT(x) (x & 1) #define GET_PTE_FRAME(x) (*x >> 11) #define ADD_ATTRIB(entry, attribute) (*entry |= (attribute)) @@ -92,4 +95,24 @@ uint32_t *virtual_mm_lookup_directory(uint32_t *page_directory, */ void virtual_mm_load_page_directory(uint32_t *page_directory); +/* + * Switches the current page directory to a given page directory + */ +bool virtual_mm_switch_page_directory(uint32_t *page_directory); + +/* + * Flushes the given TLB entry + */ +void virtual_mm_flush_tlb_entry(uint32_t *virtual_addr); + +/* + * Map a given physical address to a virtual address + */ +bool virtual_mm_map_page(uint32_t *physical_addr, uint32_t *virtual_addr); + +/* + * Initialize the virtual memory manager + */ +void virtual_mm_initialize(void); + #endif |