Minor refactor & spelling fix

drivers/vga.c

@@ -11,7 +11,7 @@ static uint cursor_col = 0;
 
 void vga_init() {
 	// Allocate VGA memory range
-	pm_alloc_range(VGA_ADDRESS, VGA_ADDRESS_MAX, true); // force alloc the VGA range
+	pm_malloc_range(VGA_ADDRESS, VGA_ADDRESS_MAX, true); // force alloc the VGA range
 
 	// Disable cursor
 	port_outb(0x3d4, 0x0a);

drivers/vga.h

@@ -2,7 +2,7 @@
 #define VGA_ADDRESS_MAX	0xb8fa0
 
 #define DEFAULT_COLOR 0x07 
-#define URGET_COLOR 0x0c
+#define URGENT_COLOR 0x0c
 #define SUCCESS_COLOR 0x0a
 
 #define MAX_ROWS 25

kernel/memory.c

@@ -55,22 +55,23 @@ void block_free(uint blockidx) {
 	last_block = blockidx;
 }
 
-uint find_free(uint block_count) {
-	uint lower;
-	uint upper;
+int find_free(uint block_count) {
+	int lowerb = -1; // if this function returns -1
+	// then it has failed.
 
 	// Loop through bitmap starting at last_block 
-	for( lower = last_block; lower < MAX_BLOCK_COUNT - block_count; lower++ ) {
+	for( uint lower = last_block; lower < MAX_BLOCK_COUNT - block_count; lower++ ) {
 		bool range_is_free = true;
-		for( upper = 0; upper < block_count; upper++ ) {
+		for( uint upper = 0; upper < block_count; upper++ ) {
 			range_is_free &= CHECK_BITMAP(bitmap, lower+upper); // perform AND on each block (if free)
 		}
 
 		if(range_is_free) // if range is free
+			lowerb = (int)lower;
 			break; // then stop searching
 	}
 
-	return lower; // return the lower block index
+	return lowerb; // return the lower block index
 }
 
 bool check_block_range(uint start, uint end) {
@@ -86,7 +87,7 @@ bool check_block_range(uint start, uint end) {
 	return allowed;
 }
 
-void pm_alloc_range(ulong start, ulong end, bool force) {
+void pm_malloc_range(ulong start, ulong end, bool force) {
 	uint idx_start;
 	uint idx_end;
 
@@ -110,5 +111,15 @@ void pm_alloc_range(ulong start, ulong end, bool force) {
 }
 
 pointer pm_malloc(uint block_count) {
+	// find free block range and get lower offset
+	int lower;
+	lower = find_free(block_count);
 
+	if( lower < 0 )
+		println("--! OUT OF MEMORY !--", URGENT_COLOR);
+		// do some out-of-memory interupt
+		return 0x0;
+
+	// allocate those blocks
+	// return pointer to start of first block
 }

kernel/memory.h

@@ -16,10 +16,10 @@ void mod_bitmap(uint bit, uint flag);
 pointer block_alloc(uint blockidx); // allocate a block
 void block_free(uint blockidx); // free a block
 
-uint find_free(uint block_count);
+int find_free(uint block_count);
 
 bool check_block_range(uint start, uint end);
-void pm_alloc_range(ulong start, ulong end, bool force); // allocate a range of memory 
+void pm_malloc_range(ulong start, ulong end, bool force); // allocate a range of memory 
 
 pointer pm_malloc(uint block_count); // allocate some blocks
 void pm_free(int* p); // free a var (if allocated with pm_malloc)