Alloc stuff

drivers/vga.c

@@ -1,6 +1,7 @@
 // VGA Graphics Library
 #include "vga.h"
 #include "../kernel/io.h"
+#include "../kernel/memory.h"
 #include "../lib/str.h"
 #include "../lib/strf.h"
 
@@ -17,6 +18,9 @@ void vga_init() {
 	clear_screen();
 
 	set_cursor_pos(0, 0);
+
+	// TODO: allocate VGA physical memory
+	// pm_mem_alloc(VGA_ADDRESS, VGA_ADDRESS_MAX);
 }
 
 /*

kernel/kernel.c

@@ -36,7 +36,7 @@ void init() {
 	block_alloc(2); // this should fail
 
 	println("(2) Freeing 2nd block, alloc after should succeed", DEFAULT_COLOR);
-	block_free(2);
+	block_free(2); // after this, allocation of 2nd block should work
 	block_alloc(2);
 
 	char* strbuf = "Concat test: ";

kernel/memory.c

@@ -15,9 +15,11 @@
 
 #define CHECK_BITMAP(map, idx) ((map) & (1<<(idx)))
 
-#define BM_FREE 0
+#define BLOCK_TO_MEMP(idx) idx
+
 
 static int bitmap = 0; 
+static uint last_block;
 void mod_bitmap(uint bit, uint bflag) {
 	// create a bitmask that will be applied to the bitmap
 	int bitmask = 1 << bit;
@@ -28,7 +30,7 @@ void mod_bitmap(uint bit, uint bflag) {
 }
 
 
-int block_alloc(uint blockidx) {
+int* block_alloc(uint blockidx) {
 	int block_bflag;
 	block_bflag = CHECK_BITMAP(bitmap, blockidx);
 
@@ -36,6 +38,8 @@ int block_alloc(uint blockidx) {
 		println("Alloc!", DEFAULT_COLOR);
 
 		mod_bitmap(blockidx, 1);
+		last_block = blockidx;
+
 		return 0; // placeholder
 	} else {
 		println("ERROR! Attemped to allocate non-free block.", 0x0c);
@@ -47,4 +51,11 @@ int block_alloc(uint blockidx) {
 void block_free(uint blockidx) {
 	println("Dealloc block...", DEFAULT_COLOR);	
 	mod_bitmap(blockidx, BM_FREE);
+	last_block = blockidx;
+}
+
+/*
+int* pm_malloc(uint block_count) {
+	
 }
+*/

kernel/memory.h

@@ -4,9 +4,19 @@
 #define MAX_BLOCK_COUNT 32 // placeholder
 #define MEMSIZE_TO_BLOCKS(n) ((n*1024)/BLOCK_SIZE)
 
+#define BM_FREE 0
+
+#define PM_MEM_START 0x000000 // start of memory
+#define PM_MEM_END 0xb7000 // end of memory  TODO: fix me/change or something
+
 // void init_pmm(uint map_addr, uint bsize); // Initialize physical memory manager
 
 void mod_bitmap(uint bit, uint flag);
 
-int block_alloc(uint blockidx);
-void block_free(uint blockidx);
+int* block_alloc(uint blockidx); // allocate a block
+void block_free(uint blockidx); // free a block
+
+void pm_alloc_range(uint start, uint end, bool force); // allocate a range of memory 
+
+int* pm_malloc(uint block_count); // allocate some blocks
+void pm_free(int* p); // free a var (if allocated with pm_malloc)