1 files changed, 18 insertions, 0 deletions
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();
+}