changed page size to 8KB

riscv/mmu.h

@@ -10,8 +10,8 @@ class processor_t;
 
 // virtual memory configuration
 typedef reg_t pte_t;
-const reg_t LEVELS = 4;
-const reg_t PGSHIFT = 12;
+const reg_t LEVELS = sizeof(pte_t) == sizeof(uint64_t) ? 3 : 2;
+const reg_t PGSHIFT = 13;
 const reg_t PGSIZE = 1 << PGSHIFT;
 const reg_t PTIDXBITS = PGSHIFT - (sizeof(pte_t) == 8 ? 3 : 2);
 const reg_t PPN_BITS = 8*sizeof(reg_t) - PGSHIFT;
@@ -28,8 +28,7 @@ const reg_t PPN_BITS = 8*sizeof(reg_t) - PGSHIFT;
 #define PTE_SW   0x100 // Supervisor Read permission
 #define PTE_SR   0x200 // Supervisor Write permission
 #define PTE_PERM (PTE_SR | PTE_SW | PTE_SX | PTE_UR | PTE_UW | PTE_UX)
-#define PTE_PERM_SHIFT 4
-#define PTE_PPN_SHIFT  12 // LSB of physical page number in the PTE
+#define PTE_PPN_SHIFT  13 // LSB of physical page number in the PTE
 
 // this class implements a processor's port into the virtual memory system.
 // an MMU and instruction cache are maintained for simulator performance.