Update link.ld with stack, heap, and memory layout improvements.

Author: OpenSoftware-World

link.ld

@@ -6,18 +6,20 @@ SECTIONS
 
     .multiboot : ALIGN(4K)
     {
-        *(.multiboot)
+        KEEP(*(.multiboot))
     }
 
     .text : ALIGN(4K)
     {
         *(.text*)
     }
 
+    __ro_start = .;
     .rodata : ALIGN(4K)
     {
         *(.rodata*)
     }
+    __ro_end = .;
 
     .data : ALIGN(4K)
     {
@@ -26,7 +28,26 @@ SECTIONS
 
     .bss : ALIGN(4K)
     {
+        _bss_start = .;
         *(COMMON)
         *(.bss*)
+        _bss_end = .;
     }
+
+    .stack : ALIGN(16)
+    {
+        _stack_start = .;
+        . = . + 0x4000;
+        _stack_end = .;
+    }
+
+    .heap : ALIGN(16)
+    {
+    _heap_start = .;
+    . = . + 0x100000;
+    _heap_end = .;
+    }
+
+    _end = .;
+    _kernel_end = .;
 }