actually use variable fb address

turns out that last commit still used a constant lol

kernel/Syscalls/syscalls.c

@@ -5,11 +5,12 @@
 
 int32_t sys_read(int32_t fd, const void* buf, int32_t len)
 {
-
+	printf("sysread\n");
+	return -1;
 }
 
 int32_t sys_write(int32_t fd, const void* buf, int32_t len)
 {
-	printf("syswrite");
-	return 0;
+	printf("syswrite\n");
+	return -1;
 }
\ No newline at end of file

kernel/paging.c

@@ -55,18 +55,23 @@ void init_paging()
 
 }
 
-int32_t map_large(uint32_t v_addr, uint32_t p_addr)
+int32_t kmap_large(uint32_t v_addr, uint32_t p_addr)
 {
-	page_directory[0x3f4].present = 1;
-	page_directory[0x3f4].rw = 1;
-	page_directory[0x3f4].ps = 1;
-	page_directory[0x3f4].g = 1;
-	PDIR_SET_ADDR(0x3f4, 0xFD000000);
+	uint32_t dir_index = (uint32_t)v_addr >> DIR_BIT_OFF;
+
+	if (dir_index > 1023)
+		return -1;
+	
+	page_directory[dir_index].present = 1;
+	page_directory[dir_index].rw = 1;
+	page_directory[dir_index].ps = 1;
+	page_directory[dir_index].g = 1;
+	PDIR_SET_ADDR(dir_index, p_addr);
 
 	FLUSH_TLB();
 }
 
-int32_t map_2large(uint32_t v_addr, uint32_t p_addr)
+int32_t map_large(uint32_t v_addr, uint32_t p_addr)
 {
     uint32_t dir_index = (uint32_t)v_addr >> DIR_BIT_OFF;
 

kernel/paging.h

@@ -70,6 +70,7 @@ extern ptable_entry_t page_table[PT_SIZE];
 /* Initialize Paging */
 void init_paging(void);
 
+int32_t kmap_large(uint32_t v_addr, uint32_t p_addr);
 int32_t map_large(uint32_t v_addr, uint32_t p_addr);
 int32_t map_vmem(uint8_t** start);
 int32_t unmap_small(uint32_t* v_addr);