Add heap memory allocated benchmarking

Author: scopeInfinity

src/drivers/keyboard/scancode_handler.c

@@ -193,7 +193,8 @@ static const unsigned char KEYBOARD_ASCII_MAPH_OTHERS[] = {
     KEYBOARD_SC_RPF0_keypad_minus, '-',
     KEYBOARD_SC_RPF0_keypad_mul, '*',
     KEYBOARD_SC_RPF0_keypad_plus, '+',
-    KEYBOARD_SC_PE0_RPF0_keypad_enter, '\n'
+    KEYBOARD_SC_PE0_RPF0_keypad_enter, '\n',
+    KEYBOARD_SC_RPF0_backspace, '\b'
 };
 
 static unsigned char KEYBOARD_ASCII_MAPPING[256];

src/usr/include/stdlib.h

@@ -18,6 +18,7 @@ int min(int, int);
 int max(int, int);
 int abs(int a);
 
+int benchmark_get_heap_usage();
 void* malloc(size_t size);
 void free(void* ptr);
 

src/usr/lib/stdlib.c

@@ -148,6 +148,13 @@ extern char _heap_start[];  // defined in linker.ld
 static int heap_head_offset = 0;
 static const int heap_stack_safety_gap = 1024; // keep 1 kb free between stack and heap
 
+// benchmarking
+static int benchmark_heap_inuse = 0;
+
+int benchmark_get_heap_usage() {
+    return benchmark_heap_inuse;
+}
+
 void* malloc(size_t size) {
     void* loc = _heap_start + heap_head_offset;
     void* max_loc = get_current_esp()-heap_stack_safety_gap-size;
@@ -157,6 +164,7 @@ void* malloc(size_t size) {
         return NULL;
     }
     heap_head_offset += size;
+    benchmark_heap_inuse += size;
     return loc;
 }
 

src/usr/local/src/logo.cpp

@@ -407,6 +407,8 @@ void start_logo() {
 void cleanup_graphics() {
     std::graphics::closegraph();
     std::cout << "logo graphics closed" << std::endl;
+    std::cout << "heap memory at exit " <<
+        (std::benchmark_get_heap_usage()/1024) << "KB" << std::endl;
 }
 
 int show_usage() {