diff --git a/kern/kernel.ld b/kern/kernel.ld
index af3fd7c..17e1ee2 100644
--- a/kern/kernel.ld
+++ b/kern/kernel.ld
@@ -1,14 +1,13 @@
 OUTPUT_ARCH( "riscv" )
 ENTRY( _entry ) /* See: entry.S */
 
+MEMORY
+{
+  RAM (rwx) : ORIGIN = 0x80000000, LENGTH = 128M
+}
+
 SECTIONS
 {
-  /*
-   * ensure that entry.S / _entry is at 0x80000000,
-   * where qemu's -kernel jumps.
-   */
-  . = 0x80000000;
-
   /*
    * This section contains the code. This is, the machine language instructions
    * that will be executed by the processor. In here we will find symbols
@@ -35,7 +34,7 @@ SECTIONS
 
     /* Define symbol etext to be the current location. */
     PROVIDE(etext = .);
-  } :text
+  } > RAM :text
 
   /*
    * This contains any data that is marked as read only.
@@ -47,7 +46,7 @@ SECTIONS
     *(.srodata*) /* do not need to distinguish this from .rodata */
     . = ALIGN(16);
     *(.rodata*)
-  }
+  } > RAM
 
   /*
    * This section contains initialized global and static variables.
@@ -58,7 +57,7 @@ SECTIONS
     *(.sdata*) /* do not need to distinguish this from .data */
     . = ALIGN(16);
     *(.data*)
-  }
+  } > RAM
 
   /*
    * Contains all uninitialized global and static var iables. These are usually
@@ -71,10 +70,12 @@ SECTIONS
     *(.sbss*) /* do not need to distinguish this from .bss */
     . = ALIGN(16);
     *(.bss*)
-  }
+  } > RAM
 
   /* Define symbol end as current location, note that this is not aligned, see vm.c */
   PROVIDE(kernel_end = .);
+  PROVIDE(__heap_start = ALIGN(32));
+  PROVIDE(__heap_end = ORIGIN(RAM) + LENGTH(RAM));
 }
 
 PHDRS {