diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index e06c271..5d1275a 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -536,10 +536,14 @@
 	return 0;
 }
 
+void early_panic(char *msg)
+{
+	early_printk(msg);
+	panic(msg);
+}
+
 void __init setup_memory_region(void)
 {
-	char *who = "BIOS-e820";
-
 	/*
 	 * Try to copy the BIOS-supplied E820-map.
 	 *
@@ -547,24 +551,10 @@
 	 * the next section from 1mb->appropriate_mem_k
 	 */
 	sanitize_e820_map(E820_MAP, &E820_MAP_NR);
-	if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) {
-		unsigned long mem_size;
-
-		/* compare results from other methods and take the greater */
-		if (ALT_MEM_K < EXT_MEM_K) {
-			mem_size = EXT_MEM_K;
-			who = "BIOS-88";
-		} else {
-			mem_size = ALT_MEM_K;
-			who = "BIOS-e801";
-		}
-
-		e820.nr_map = 0;
-		add_memory_region(0, LOWMEMSIZE(), E820_RAM);
-		add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
-  	}
+	if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0)
+		early_panic("Cannot find a valid memory map");
 	printk(KERN_INFO "BIOS-provided physical RAM map:\n");
-	e820_print_map(who);
+	e820_print_map("BIOS-e820");
 }
 
 static int __init parse_memopt(char *p)
diff --git a/include/asm-x86_64/e820.h b/include/asm-x86_64/e820.h
index dba0121..8dac397 100644
--- a/include/asm-x86_64/e820.h
+++ b/include/asm-x86_64/e820.h
@@ -22,10 +22,6 @@
 #define E820_ACPI	3 /* usable as RAM once ACPI tables have been read */
 #define E820_NVS	4
 
-#define HIGH_MEMORY	(1024*1024)
-
-#define LOWMEMSIZE()	(0x9f000)
-
 #ifndef __ASSEMBLY__
 struct e820entry {
 	u64 addr;	/* start of memory segment */