diff options
| author | Felix Held <felix-coreboot@felixheld.de> | 2023-06-06 00:29:58 +0200 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2023-06-07 00:05:30 +0000 |
| commit | 11ff753407ee7fd1cb2da06f8bedc5ac40ebbd95 (patch) | |
| tree | 6ecbb219bf48422b94a9e6ccdc89ba87a9a1bf16 /src/soc/amd/common/block/cpu/noncar | |
| parent | b39e93e56fdd2b11b8e7a12889472f144673d05a (diff) | |
soc/amd/common/block/cpu/noncar: add get_usable_physical_address_bits()
In case the secure memory encryption is enabled, some of the upper
usable address bits of the host can't be used any more. Bits 11..6 in
CPUID_EBX_MEM_ENCRYPT indicate how many of the address bits are taken
away from the usable address bits in the case the secure memory
encryption is enabled.
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ia810b0984972216095da2ad8f9c19e37684f2a2e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75623
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/amd/common/block/cpu/noncar')
| -rw-r--r-- | src/soc/amd/common/block/cpu/noncar/cpu.c | 18 |
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(); +} |