Memory::get_system and Memory::get_usable

kernel/include/memory/Memory.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <stdint.h>
+
+namespace Memory
+{
+    uint64_t get_system();
+    uint64_t get_usable();
+}

kernel/src/main.cpp

@@ -13,6 +13,7 @@
 #include "io/Serial.h"
 #include "log/Log.h"
 #include "memory/KernelHeap.h"
+#include "memory/Memory.h"
 #include "panic/hang.h"
 #include "render/BBRenderer.h"
 #include "render/Draw.h"
@@ -65,24 +66,14 @@ extern "C" void _start()
 
     kinfoln("Prepared PIT");
 
-    uint64_t mmap_entries = (bootboot.size - 128) / 16;
-    MMapEnt* entry = (&bootboot.mmap);
-    for (uint64_t i = 0; i < mmap_entries; i++)
-    {
-        if (MMapEnt_IsFree(entry))
-        {
-            printf("Free region at 0x%zx, of size 0x%zx\n", MMapEnt_Ptr(entry), MMapEnt_Size(entry));
-        }
-        else { printf("Used region at 0x%zx, of size 0x%zx\n", MMapEnt_Ptr(entry), MMapEnt_Size(entry)); }
-        entry++;
-    }
-
     Debug::DebugStatus::the()->StartBootStage(Color::Yellow);
     Interrupts::enable();
     Debug::DebugStatus::the()->PassBootStage(Color::Yellow);
 
     kinfoln("Interrupts enabled");
 
+    printf("%d KB of system memory, %d KB available\n", Memory::get_system() / 1024, Memory::get_usable() / 1024);
+
     Debug::DebugStatus::the()->StartBootStage(Color{0x33, 0x33, 0x00, 0xFF});
     ACPI::SDTHeader* rootSDT = ACPI::GetRSDTOrXSDT();
     bool isXSDT = false;

kernel/src/memory/Memory.cpp

@@ -0,0 +1,44 @@
+#include "memory/Memory.h"
+#include "bootboot.h"
+
+extern BOOTBOOT bootboot;
+
+uint64_t Memory::get_system()
+{
+    static uint64_t result = 0;
+    static bool cached = false;
+
+    if (cached) return result;
+
+    MMapEnt* ptr = &bootboot.mmap;
+    uint64_t mmap_entries = (bootboot.size - 128) / 16;
+    for (uint64_t i = 0; i < mmap_entries; i++)
+    {
+        result += MMapEnt_Size(ptr);
+        ptr++;
+    }
+
+    cached = true;
+
+    return result;
+}
+
+uint64_t Memory::get_usable()
+{
+    static uint64_t result = 0;
+    static bool cached = false;
+
+    if (cached) return result;
+
+    MMapEnt* ptr = &bootboot.mmap;
+    uint64_t mmap_entries = (bootboot.size - 128) / 16;
+    for (uint64_t i = 0; i < mmap_entries; i++)
+    {
+        if (MMapEnt_IsFree(ptr)) result += MMapEnt_Size(ptr);
+        ptr++;
+    }
+
+    cached = true;
+
+    return result;
+}