diff --git a/include/grub/i386/pc/init.h b/include/grub/i386/pc/init.h
index 30130d189..368668922 100644
--- a/include/grub/i386/pc/init.h
+++ b/include/grub/i386/pc/init.h
@@ -23,10 +23,6 @@
 #include <grub/symbol.h>
 #include <grub/machine/memory.h>
 
-/* Get the memory size in KB. If EXTENDED is zero, return conventional
-   memory, otherwise return extended memory.  */
-grub_uint16_t grub_get_memsize (int extended);
-
 /* Get a packed EISA memory map. Lower 16 bits are between 1MB and 16MB
    in 1KB parts, and upper 16 bits are above 16MB in 64KB parts.  */
 grub_uint32_t grub_get_eisa_mmap (void);
diff --git a/kern/i386/pc/init.c b/kern/i386/pc/init.c
index fa646df19..ab625ef44 100644
--- a/kern/i386/pc/init.c
+++ b/kern/i386/pc/init.c
@@ -23,6 +23,7 @@
 #include <grub/machine/memory.h>
 #include <grub/machine/console.h>
 #include <grub/machine/kernel.h>
+#include <grub/machine/int.h>
 #include <grub/types.h>
 #include <grub/err.h>
 #include <grub/dl.h>
@@ -134,6 +135,22 @@ compact_mem_regions (void)
       }
 }
 
+/*
+ *
+ * grub_get_conv_memsize(i) :  return the conventional memory size in KB.
+ *	BIOS call "INT 12H" to get conventional memory size
+ *      The return value in AX.
+ */
+static inline grub_uint16_t
+grub_get_conv_memsize (void)
+{
+  struct grub_bios_int_registers regs;
+
+  regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+  grub_bios_interrupt (0x12, &regs);
+  return regs.eax & 0xffff;
+}
+
 void
 grub_machine_init (void)
 {
@@ -143,7 +160,7 @@ grub_machine_init (void)
   /* Initialize the console as early as possible.  */
   grub_console_init ();
 
-  grub_lower_mem = grub_get_memsize (0) << 10;
+  grub_lower_mem = grub_get_conv_memsize () << 10;
 
   /* Sanity check.  */
   if (grub_lower_mem < GRUB_MEMORY_MACHINE_RESERVED_END)
diff --git a/kern/i386/pc/mmap.c b/kern/i386/pc/mmap.c
index 52d8fd597..b1bf2056f 100644
--- a/kern/i386/pc/mmap.c
+++ b/kern/i386/pc/mmap.c
@@ -17,10 +17,27 @@
  */
 
 #include <grub/machine/init.h>
+#include <grub/machine/int.h>
 #include <grub/machine/memory.h>
 #include <grub/err.h>
 #include <grub/types.h>
 
+/*
+ * grub_get_ext_memsize() :  return the extended memory size in KB.
+ *	BIOS call "INT 15H, AH=88H" to get extended memory size
+ *	The return value in AX.
+ *
+ */
+static inline grub_uint16_t
+grub_get_ext_memsize (void)
+{
+  struct grub_bios_int_registers regs;
+
+  regs.eax = 0x8800;
+  grub_bios_interrupt (0x15, &regs);
+  return regs.eax & 0xffff;
+}
+
 grub_err_t
 grub_machine_mmap_iterate (int NESTED_FUNC_ATTR (*hook) (grub_uint64_t, grub_uint64_t, grub_uint32_t))
 {
@@ -56,7 +73,7 @@ grub_machine_mmap_iterate (int NESTED_FUNC_ATTR (*hook) (grub_uint64_t, grub_uin
 	    hook (0x1000000, eisa_mmap & ~0xFFFF, GRUB_MACHINE_MEMORY_AVAILABLE);
 	}
       else
-	hook (0x100000, grub_get_memsize (1) << 10, GRUB_MACHINE_MEMORY_AVAILABLE);
+	hook (0x100000, grub_get_ext_memsize () << 10, GRUB_MACHINE_MEMORY_AVAILABLE);
     }
 
   return 0;
diff --git a/kern/i386/pc/startup.S b/kern/i386/pc/startup.S
index 6733e12bc..233ab8074 100644
--- a/kern/i386/pc/startup.S
+++ b/kern/i386/pc/startup.S
@@ -505,46 +505,6 @@ FUNCTION(grub_chainloader_real_boot)
 
 #include "../loader.S"
 
-/*
- *
- * grub_get_memsize(i) :  return the memory size in KB. i == 0 for conventional
- *		memory, i == 1 for extended memory
- *	BIOS call "INT 12H" to get conventional memory size
- *	BIOS call "INT 15H, AH=88H" to get extended memory size
- *		Both have the return value in AX.
- *
- */
-
-FUNCTION(grub_get_memsize)
-	pushl	%ebp
-
-	movl	%eax, %edx
-
-	call	prot_to_real	/* enter real mode */
-	.code16
-
-	testl	%edx, %edx
-	jnz	xext
-
-	int	$0x12
-	jmp	xdone
-
-xext:
-	movb	$0x88, %ah
-	int	$0x15
-
-xdone:
-	movw	%ax, %dx
-
-	DATA32	call	real_to_prot
-	.code32
-
-	movw	%dx, %ax
-
-	popl	%ebp
-	ret
-
-
 /*
  *
  * grub_get_eisa_mmap() :  return packed EISA memory map, lower 16 bits is