diff --git a/src/northbridge/intel/ironlake/northbridge.c b/src/northbridge/intel/ironlake/northbridge.c
index d2f5c79..aec0fc0 100644
--- a/src/northbridge/intel/ironlake/northbridge.c
+++ b/src/northbridge/intel/ironlake/northbridge.c
@@ -33,7 +33,6 @@
  * 0xc0000 - 0xcffff: VGA OPROM (needed by kernel)
  * 0xe0000 - 0xfffff: SeaBIOS, if used, otherwise DMI
  */
-static const int legacy_hole_base_k = 0xa0000 / 1024;
 
 static void add_fixed_resources(struct device *dev, int index)
 {
@@ -54,8 +53,8 @@
 	resource->flags = IORESOURCE_MEM | IORESOURCE_RESERVE | IORESOURCE_FIXED |
 			  IORESOURCE_STORED | IORESOURCE_ASSIGNED;
 
-	mmio_resource_kb(dev, index++, legacy_hole_base_k, (0xc0000 / KiB) - legacy_hole_base_k);
-	reserved_ram_resource_kb(dev, index++, 0xc0000 / KiB, (0x100000 - 0xc0000) / KiB);
+	mmio_from_to(dev, index++, 0xa0000, 0xc0000);
+	reserved_ram_from_to(dev, index++, 0xc0000, 1 * MiB);
 }
 
 #if CONFIG(HAVE_ACPI_TABLES)
diff --git a/src/northbridge/intel/pineview/northbridge.c b/src/northbridge/intel/pineview/northbridge.c
index 4a5a918..bfef56e 100644
--- a/src/northbridge/intel/pineview/northbridge.c
+++ b/src/northbridge/intel/pineview/northbridge.c
@@ -20,7 +20,6 @@
  * 0xc0000 - 0xcffff: VGA OPROM (needed by kernel)
  * 0xe0000 - 0xfffff: SeaBIOS, if used, otherwise DMI
  */
-static const int legacy_hole_base_k = 0xa0000 / KiB;
 
 static void add_fixed_resources(struct device *dev, int index)
 {
@@ -35,8 +34,8 @@
 			| IORESOURCE_STORED
 			| IORESOURCE_ASSIGNED;
 
-	mmio_resource_kb(dev, index++, legacy_hole_base_k, (0xc0000 / KiB) - legacy_hole_base_k);
-	reserved_ram_resource_kb(dev, index++, 0xc0000 / KiB, (0x100000 - 0xc0000) / KiB);
+	mmio_from_to(dev, index++, 0xa0000, 0xc0000);
+	reserved_ram_from_to(dev, index++, 0xc0000, 1 * MiB);
 }
 
 static void mch_domain_read_resources(struct device *dev)
diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c
index 032e500..51e7847 100644
--- a/src/northbridge/intel/sandybridge/northbridge.c
+++ b/src/northbridge/intel/sandybridge/northbridge.c
@@ -35,8 +35,6 @@
  * 0xc0000 - 0xcffff: VGA OPROM (needed by kernel)
  * 0xe0000 - 0xfffff: SeaBIOS, if used, otherwise DMI
  */
-static const int legacy_hole_base_k = 0xa0000 / 1024;
-static const int legacy_hole_size_k = 384;
 
 static const char *northbridge_acpi_name(const struct device *dev)
 {
@@ -66,9 +64,8 @@
 {
 	mmio_resource_kb(dev, index++, uma_memory_base >> 10, uma_memory_size >> 10);
 
-	mmio_resource_kb(dev, index++, legacy_hole_base_k, (0xc0000 >> 10) - legacy_hole_base_k);
-
-	reserved_ram_resource_kb(dev, index++, 0xc0000 >> 10, (0x100000 - 0xc0000) >> 10);
+	mmio_from_to(dev, index++, 0xa0000, 0xc0000);
+	reserved_ram_from_to(dev, index++, 0xc0000, 1 * MiB);
 
 	if (is_sandybridge()) {
 		/* Required for SandyBridge sighting 3715511 */
@@ -207,9 +204,8 @@
 	printk(BIOS_INFO, "Available memory below 4GB: %lluM\n", tomk >> 10);
 
 	/* Report the memory regions */
-	ram_resource_kb(dev, index++, 0, legacy_hole_base_k);
-	ram_resource_kb(dev, index++, legacy_hole_base_k + legacy_hole_size_k,
-			  (tomk - (legacy_hole_base_k + legacy_hole_size_k)));
+	ram_from_to(dev, index++, 0, 0xa0000);
+	ram_from_to(dev, index++, 1 * MiB, tomk * KiB);
 
 	/*
 	 * If >= 4GB installed, then memory from TOLUD to 4GB is remapped above TOM.
diff --git a/src/northbridge/intel/x4x/northbridge.c b/src/northbridge/intel/x4x/northbridge.c
index 8a104a8..035862d 100644
--- a/src/northbridge/intel/x4x/northbridge.c
+++ b/src/northbridge/intel/x4x/northbridge.c
@@ -13,8 +13,6 @@
 #include <northbridge/intel/x4x/x4x.h>
 #include <cpu/intel/smm_reloc.h>
 
-static const int legacy_hole_base_k = 0xa0000 / 1024;
-
 static void mch_domain_read_resources(struct device *dev)
 {
 	u8 index;
@@ -81,11 +79,9 @@
 	printk(BIOS_INFO, "Available memory below 4GB: %uM\n", tomk >> 10);
 
 	/* Report the memory regions */
-	ram_resource_kb(dev, index++, 0, legacy_hole_base_k);
-	mmio_resource_kb(dev, index++, legacy_hole_base_k,
-			(0xc0000 >> 10) - legacy_hole_base_k);
-	reserved_ram_resource_kb(dev, index++, 0xc0000 >> 10,
-			(0x100000 - 0xc0000) >> 10);
+	ram_from_to(dev, index++, 0, 0xa0000);
+	mmio_from_to(dev, index++, 0xa0000, 0xc0000);
+	reserved_ram_from_to(dev, index++, 0xc0000, 1 * MiB);
 	ram_resource_kb(dev, index++, 0x100000 >> 10, (tomk - (0x100000 >> 10)));
 
 	/*