diff --git a/src/northbridge/intel/gm45/memmap.c b/src/northbridge/intel/gm45/memmap.c
index 6e2f703..7479a78 100644
--- a/src/northbridge/intel/gm45/memmap.c
+++ b/src/northbridge/intel/gm45/memmap.c
@@ -23,9 +23,9 @@
 #include <device/pci_def.h>
 #include <console/console.h>
 #include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
 #include <cbmem.h>
 #include <program_loading.h>
-#include <stage_cache.h>
 #include <cpu/intel/smm_reloc.h>
 #include "gm45.h"
 
@@ -84,7 +84,7 @@
 	}
 }
 
-u32 northbridge_get_tseg_base(void)
+static uintptr_t northbridge_get_tseg_base(void)
 {
 	const pci_devfn_t dev = PCI_DEV(0, 0, 0);
 
@@ -107,7 +107,7 @@
 	return tor;
 }
 
-u32 northbridge_get_tseg_size(void)
+static size_t northbridge_get_tseg_size(void)
 {
 	const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), D0F0_ESMRAMC);
 	return decode_tseg_size(esmramc) << 10;
@@ -123,14 +123,10 @@
 	return (void *) top_of_ram;
 }
 
-void stage_cache_external_region(void **base, size_t *size)
+void smm_region(uintptr_t *start, size_t *size)
 {
-	/* The stage cache lives at the end of the TSEG region.
-	 * The top of RAM is defined to be the TSEG base address.
-	 */
-	*size = CONFIG_SMM_RESERVED_SIZE;
-	*base = (void *)((uintptr_t)northbridge_get_tseg_base()
-		+ northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE);
+	*start = northbridge_get_tseg_base();
+	*size = northbridge_get_tseg_size();
 }
 
 void fill_postcar_frame(struct postcar_frame *pcf)
diff --git a/src/northbridge/intel/i945/memmap.c b/src/northbridge/intel/i945/memmap.c
index 8179f17..8207d06 100644
--- a/src/northbridge/intel/i945/memmap.c
+++ b/src/northbridge/intel/i945/memmap.c
@@ -22,10 +22,10 @@
 #include "i945.h"
 #include <console/console.h>
 #include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
 #include <program_loading.h>
 #include <cpu/intel/smm_reloc.h>
 #include <stdint.h>
-#include <stage_cache.h>
 
 /* Decodes TSEG region size to bytes. */
 u32 decode_tseg_size(const u8 esmramc)
@@ -45,7 +45,7 @@
 	}
 }
 
-u32 northbridge_get_tseg_base(void)
+static uintptr_t northbridge_get_tseg_base(void)
 {
 	uintptr_t tom;
 
@@ -60,7 +60,7 @@
 	return tom;
 }
 
-u32 northbridge_get_tseg_size(void)
+static size_t northbridge_get_tseg_size(void)
 {
 	const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC);
 	return decode_tseg_size(esmramc);
@@ -89,14 +89,10 @@
 	return ggc2uma[gms] << 10;
 }
 
-void stage_cache_external_region(void **base, size_t *size)
+void smm_region(uintptr_t *start, size_t *size)
 {
-	/* The stage cache lives at the end of the TSEG region.
-	 * The top of RAM is defined to be the TSEG base address.
-	 */
-	*size = CONFIG_SMM_RESERVED_SIZE;
-	*base = (void *)((uintptr_t)northbridge_get_tseg_base()
-		+ northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE);
+	*start = northbridge_get_tseg_base();
+	*size = northbridge_get_tseg_size();
 }
 
 void fill_postcar_frame(struct postcar_frame *pcf)
diff --git a/src/northbridge/intel/nehalem/memmap.c b/src/northbridge/intel/nehalem/memmap.c
index 1687ddf..fd10542 100644
--- a/src/northbridge/intel/nehalem/memmap.c
+++ b/src/northbridge/intel/nehalem/memmap.c
@@ -21,8 +21,8 @@
 #include <cbmem.h>
 #include <console/console.h>
 #include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
 #include <program_loading.h>
-#include <stage_cache.h>
 #include <cpu/intel/smm_reloc.h>
 #include "nehalem.h"
 
@@ -33,12 +33,12 @@
 	return tom;
 }
 
-u32 northbridge_get_tseg_base(void)
+static uintptr_t northbridge_get_tseg_base(void)
 {
-	return (u32)smm_region_start();
+	return smm_region_start();
 }
 
-u32 northbridge_get_tseg_size(void)
+static size_t northbridge_get_tseg_size(void)
 {
 	return CONFIG_SMM_TSEG_SIZE;
 }
@@ -48,13 +48,10 @@
 	return (void *) smm_region_start();
 }
 
-void stage_cache_external_region(void **base, size_t *size)
+void smm_region(uintptr_t *start, size_t *size)
 {
-	/* The stage cache lives at the end of TSEG region.
-	 * The top of RAM is defined to be the TSEG base address. */
-	*size = CONFIG_SMM_RESERVED_SIZE;
-	*base = (void *)((uintptr_t)northbridge_get_tseg_base() +
-			northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE);
+	*start = northbridge_get_tseg_base();
+	*size = northbridge_get_tseg_size();
 }
 
 void fill_postcar_frame(struct postcar_frame *pcf)
diff --git a/src/northbridge/intel/pineview/memmap.c b/src/northbridge/intel/pineview/memmap.c
index 9908f11..b4fef6b 100644
--- a/src/northbridge/intel/pineview/memmap.c
+++ b/src/northbridge/intel/pineview/memmap.c
@@ -24,9 +24,9 @@
 #include <cbmem.h>
 #include <northbridge/intel/pineview/pineview.h>
 #include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
 #include <cpu/intel/smm_reloc.h>
 #include <stdint.h>
-#include <stage_cache.h>
 
 u8 decode_pciebar(u32 *const base, u32 *const len)
 {
@@ -116,13 +116,13 @@
 	}
 }
 
-u32 northbridge_get_tseg_size(void)
+static size_t northbridge_get_tseg_size(void)
 {
 	const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC);
 	return decode_tseg_size(esmramc);
 }
 
-u32 northbridge_get_tseg_base(void)
+static uintptr_t northbridge_get_tseg_base(void)
 {
 	return pci_read_config32(PCI_DEV(0, 0, 0), TSEG);
 }
@@ -139,14 +139,10 @@
 
 }
 
-void stage_cache_external_region(void **base, size_t *size)
+void smm_region(uintptr_t *start, size_t *size)
 {
-	/* The stage cache lives at the end of the TSEG region.
-	 * The top of RAM is defined to be the TSEG base address.
-	 */
-	*size = CONFIG_SMM_RESERVED_SIZE;
-	*base = (void *)((uintptr_t)northbridge_get_tseg_base()
-		+ northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE);
+	*start = northbridge_get_tseg_base();
+	*size = northbridge_get_tseg_size();
 }
 
 void fill_postcar_frame(struct postcar_frame *pcf)
diff --git a/src/northbridge/intel/sandybridge/memmap.c b/src/northbridge/intel/sandybridge/memmap.c
index fa29b37..95bf458 100644
--- a/src/northbridge/intel/sandybridge/memmap.c
+++ b/src/northbridge/intel/sandybridge/memmap.c
@@ -21,8 +21,8 @@
 #include <console/console.h>
 #include <cpu/intel/smm_reloc.h>
 #include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
 #include <program_loading.h>
-#include <stage_cache.h>
 #include "sandybridge.h"
 
 static uintptr_t smm_region_start(void)
@@ -37,23 +37,20 @@
 	return (void *) smm_region_start();
 }
 
-u32 northbridge_get_tseg_base(void)
+static uintptr_t northbridge_get_tseg_base(void)
 {
 	return ALIGN_DOWN(smm_region_start(), 1*MiB);
 }
 
-u32 northbridge_get_tseg_size(void)
+static size_t northbridge_get_tseg_size(void)
 {
 	return CONFIG_SMM_TSEG_SIZE;
 }
 
-void stage_cache_external_region(void **base, size_t *size)
+void smm_region(uintptr_t *start, size_t *size)
 {
-	/* The stage cache lives at the end of TSEG region.
-	 * The top of RAM is defined to be the TSEG base address. */
-	*size = CONFIG_SMM_RESERVED_SIZE;
-	*base = (void *)((uintptr_t)northbridge_get_tseg_base() + northbridge_get_tseg_size()
-			- CONFIG_IED_REGION_SIZE - CONFIG_SMM_RESERVED_SIZE);
+	*start = northbridge_get_tseg_base();
+	*size = northbridge_get_tseg_size();
 }
 
 void fill_postcar_frame(struct postcar_frame *pcf)
diff --git a/src/northbridge/intel/x4x/memmap.c b/src/northbridge/intel/x4x/memmap.c
index 2f50768..41e4912 100644
--- a/src/northbridge/intel/x4x/memmap.c
+++ b/src/northbridge/intel/x4x/memmap.c
@@ -25,10 +25,10 @@
 #include <device/pci_def.h>
 #include <console/console.h>
 #include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
 #include <northbridge/intel/x4x/x4x.h>
 #include <program_loading.h>
 #include <cpu/intel/smm_reloc.h>
-#include <stage_cache.h>
 
 /** Decodes used Graphics Mode Select (GMS) to kilobytes. */
 u32 decode_igd_memory_size(const u32 gms)
@@ -112,13 +112,13 @@
 	return 1;
 }
 
-u32 northbridge_get_tseg_size(void)
+static size_t northbridge_get_tseg_size(void)
 {
 	const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), D0F0_ESMRAMC);
 	return decode_tseg_size(esmramc);
 }
 
-u32 northbridge_get_tseg_base(void)
+static uintptr_t northbridge_get_tseg_base(void)
 {
 	return pci_read_config32(PCI_DEV(0, 0, 0), D0F0_TSEG);
 }
@@ -134,14 +134,10 @@
 	return (void *) top_of_ram;
 }
 
-void stage_cache_external_region(void **base, size_t *size)
+void smm_region(uintptr_t *start, size_t *size)
 {
-	/* The stage cache lives at the end of the TSEG region.
-	 * The top of RAM is defined to be the TSEG base address.
-	 */
-	*size = CONFIG_SMM_RESERVED_SIZE;
-	*base = (void *)((uintptr_t)northbridge_get_tseg_base()
-		+ northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE);
+	*start = northbridge_get_tseg_base();
+	*size = northbridge_get_tseg_size();
 }
 
 void fill_postcar_frame(struct postcar_frame *pcf)