diff --git a/src/northbridge/intel/common/fixed_bars.h b/src/northbridge/intel/common/fixed_bars.h
index e9c63c5b7d..8a0d9dc1b6 100644
--- a/src/northbridge/intel/common/fixed_bars.h
+++ b/src/northbridge/intel/common/fixed_bars.h
@@ -9,6 +9,7 @@ _Static_assert(CONFIG_FIXED_EPBAR_MMIO_BASE  != 0,  "EPBAR base address is zero"
 
 #include <stdint.h>
 
+/* Deprecated in favor of the read/write accessors below */
 #define MCHBAR8(x)	(*((volatile u8  *)((uintptr_t)CONFIG_FIXED_MCHBAR_MMIO_BASE + (x))))
 #define MCHBAR16(x)	(*((volatile u16 *)((uintptr_t)CONFIG_FIXED_MCHBAR_MMIO_BASE + (x))))
 #define MCHBAR32(x)	(*((volatile u32 *)((uintptr_t)CONFIG_FIXED_MCHBAR_MMIO_BASE + (x))))
@@ -31,4 +32,69 @@ _Static_assert(CONFIG_FIXED_EPBAR_MMIO_BASE  != 0,  "EPBAR base address is zero"
 #define EPBAR16(x)	(*((volatile u16 *)((uintptr_t)CONFIG_FIXED_EPBAR_MMIO_BASE + (x))))
 #define EPBAR32(x)	(*((volatile u32 *)((uintptr_t)CONFIG_FIXED_EPBAR_MMIO_BASE + (x))))
 
+/* The *bar_{read,write}X macros will be replaced with functions in follow-ups */
+#define _bar_clrsetbits_impl(base, addr, clear, set, bits)				\
+		base##bar_write##bits(addr,						\
+			(base##bar_read##bits(addr) & ~(uint##bits##_t)(clear)) | (set))
+
+#define mchbar_read8(addr)		MCHBAR8(addr)
+#define mchbar_read16(addr)		MCHBAR16(addr)
+#define mchbar_read32(addr)		MCHBAR32(addr)
+
+#define mchbar_write8(addr, value)	(MCHBAR8(addr) = (value))
+#define mchbar_write16(addr, value)	(MCHBAR16(addr) = (value))
+#define mchbar_write32(addr, value)	(MCHBAR32(addr) = (value))
+
+#define mchbar_clrsetbits8(addr, clear, set)	_bar_clrsetbits_impl(mch, addr, clear, set, 8)
+#define mchbar_clrsetbits16(addr, clear, set)	_bar_clrsetbits_impl(mch, addr, clear, set, 16)
+#define mchbar_clrsetbits32(addr, clear, set)	_bar_clrsetbits_impl(mch, addr, clear, set, 32)
+
+#define mchbar_setbits8(addr, set)		mchbar_clrsetbits8(addr, 0, set)
+#define mchbar_setbits16(addr, set)		mchbar_clrsetbits16(addr, 0, set)
+#define mchbar_setbits32(addr, set)		mchbar_clrsetbits32(addr, 0, set)
+
+#define mchbar_clrbits8(addr, clear)		mchbar_clrsetbits8(addr, clear, 0)
+#define mchbar_clrbits16(addr, clear)		mchbar_clrsetbits16(addr, clear, 0)
+#define mchbar_clrbits32(addr, clear)		mchbar_clrsetbits32(addr, clear, 0)
+
+#define dmibar_read8(addr)		DMIBAR8(addr)
+#define dmibar_read16(addr)		DMIBAR16(addr)
+#define dmibar_read32(addr)		DMIBAR32(addr)
+
+#define dmibar_write8(addr, value)	(DMIBAR8(addr) = (value))
+#define dmibar_write16(addr, value)	(DMIBAR16(addr) = (value))
+#define dmibar_write32(addr, value)	(DMIBAR32(addr) = (value))
+
+#define dmibar_clrsetbits8(addr, clear, set)	_bar_clrsetbits_impl(dmi, addr, clear, set, 8)
+#define dmibar_clrsetbits16(addr, clear, set)	_bar_clrsetbits_impl(dmi, addr, clear, set, 16)
+#define dmibar_clrsetbits32(addr, clear, set)	_bar_clrsetbits_impl(dmi, addr, clear, set, 32)
+
+#define dmibar_setbits8(addr, set)		dmibar_clrsetbits8(addr, 0, set)
+#define dmibar_setbits16(addr, set)		dmibar_clrsetbits16(addr, 0, set)
+#define dmibar_setbits32(addr, set)		dmibar_clrsetbits32(addr, 0, set)
+
+#define dmibar_clrbits8(addr, clear)		dmibar_clrsetbits8(addr, clear, 0)
+#define dmibar_clrbits16(addr, clear)		dmibar_clrsetbits16(addr, clear, 0)
+#define dmibar_clrbits32(addr, clear)		dmibar_clrsetbits32(addr, clear, 0)
+
+#define epbar_read8(addr)		EPBAR8(addr)
+#define epbar_read16(addr)		EPBAR16(addr)
+#define epbar_read32(addr)		EPBAR32(addr)
+
+#define epbar_write8(addr, value)	(EPBAR8(addr) = (value))
+#define epbar_write16(addr, value)	(EPBAR16(addr) = (value))
+#define epbar_write32(addr, value)	(EPBAR32(addr) = (value))
+
+#define epbar_clrsetbits8(addr, clear, set)	_bar_clrsetbits_impl(ep, addr, clear, set, 8)
+#define epbar_clrsetbits16(addr, clear, set)	_bar_clrsetbits_impl(ep, addr, clear, set, 16)
+#define epbar_clrsetbits32(addr, clear, set)	_bar_clrsetbits_impl(ep, addr, clear, set, 32)
+
+#define epbar_setbits8(addr, set)		epbar_clrsetbits8(addr, 0, set)
+#define epbar_setbits16(addr, set)		epbar_clrsetbits16(addr, 0, set)
+#define epbar_setbits32(addr, set)		epbar_clrsetbits32(addr, 0, set)
+
+#define epbar_clrbits8(addr, clear)		epbar_clrsetbits8(addr, clear, 0)
+#define epbar_clrbits16(addr, clear)		epbar_clrsetbits16(addr, clear, 0)
+#define epbar_clrbits32(addr, clear)		epbar_clrsetbits32(addr, clear, 0)
+
 #endif	/* ! NORTHBRIDGE_INTEL_COMMON_FIXED_BARS_H */