diff --git a/src/include/cpu/amd/cpuid.h b/src/include/cpu/amd/cpuid.h
index b593562a09..81d008de77 100644
--- a/src/include/cpu/amd/cpuid.h
+++ b/src/include/cpu/amd/cpuid.h
@@ -121,4 +121,8 @@
 #define  CPUID_EBX_THREADS_SHIFT	8
 #define  CPUID_EBX_THREADS_MASK		(0xff << CPUID_EBX_THREADS_SHIFT)
 
+#define CPUID_EBX_MEM_ENCRYPT		0x8000001f
+#define  CPUID_EBX_MEM_ENCRYPT_ADDR_BITS_SHIFT	6
+#define  CPUID_EBX_MEM_ENCRYPT_ADDR_BITS_MASK	(0x3f << CPUID_EBX_MEM_ENCRYPT_ADDR_BITS_SHIFT)
+
 #endif /* CPU_AMD_CPUID_H */
diff --git a/src/include/cpu/amd/mtrr.h b/src/include/cpu/amd/mtrr.h
index 04d775cade..32a7949b19 100644
--- a/src/include/cpu/amd/mtrr.h
+++ b/src/include/cpu/amd/mtrr.h
@@ -12,6 +12,7 @@
 #define MTRR_WRITE_MEM			(1 << 3)
 
 #define SYSCFG_MSR			0xC0010010
+#define SYSCFG_MSR_SMEE			(1 << 23)
 #define SYSCFG_MSR_TOM2WB		(1 << 22)
 #define SYSCFG_MSR_TOM2En		(1 << 21)
 #define SYSCFG_MSR_MtrrVarDramEn	(1 << 20)
diff --git a/src/soc/amd/common/block/cpu/noncar/cpu.c b/src/soc/amd/common/block/cpu/noncar/cpu.c
index 4afb69a299..891dece7dd 100644
--- a/src/soc/amd/common/block/cpu/noncar/cpu.c
+++ b/src/soc/amd/common/block/cpu/noncar/cpu.c
@@ -1,9 +1,12 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <amdblocks/cpu.h>
+#include <arch/cpuid.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
+#include <cpu/amd/cpuid.h>
 #include <cpu/amd/msr.h>
+#include <cpu/amd/mtrr.h>
 #include <smbios.h>
 #include <soc/iomap.h>
 #include <types.h>
@@ -31,3 +34,18 @@ void set_cstate_io_addr(void)
 	cst_addr.lo = ACPI_CSTATE_CONTROL;
 	wrmsr(MSR_CSTATE_ADDRESS, cst_addr);
 }
+
+static uint32_t get_smee_reserved_address_bits(void)
+{
+	if (rdmsr(SYSCFG_MSR).raw & SYSCFG_MSR_SMEE)
+		return (cpuid_ebx(CPUID_EBX_MEM_ENCRYPT) &
+			CPUID_EBX_MEM_ENCRYPT_ADDR_BITS_MASK) >>
+			CPUID_EBX_MEM_ENCRYPT_ADDR_BITS_SHIFT;
+	else
+		return 0;
+}
+
+uint32_t get_usable_physical_address_bits(void)
+{
+	return cpu_phys_address_size() - get_smee_reserved_address_bits();
+}
diff --git a/src/soc/amd/common/block/include/amdblocks/cpu.h b/src/soc/amd/common/block/include/amdblocks/cpu.h
index 4aa225bda3..10dd23f11b 100644
--- a/src/soc/amd/common/block/include/amdblocks/cpu.h
+++ b/src/soc/amd/common/block/include/amdblocks/cpu.h
@@ -12,6 +12,7 @@ void early_cache_setup(void);
 int get_cpu_count(void);
 unsigned int get_threads_per_core(void);
 void set_cstate_io_addr(void);
+uint32_t get_usable_physical_address_bits(void);
 void write_resume_eip(void);
 
 union pstate_msr; /* proper definition is in soc/msr.h */