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authorPratik Prajapati <pratikkumar.v.prajapati@intel.com>2017-10-11 11:48:04 -0700
committerAaron Durbin <adurbin@chromium.org>2017-10-20 20:06:21 +0000
commit0e5eb46bb79d9737594eb296043c3e2d65a609fb (patch)
tree95f8b6a7ea54ed9ecd3d0cf9da618bfefa098667 /src/soc/intel
parent90ebf96df59bfe9d60721ac881c07c00df29c418 (diff)
intel/common/block/sgx: Add API to enumerate SGX resources and update GNVS
Intel SDM: Table 36-6. CPUID Leaf 12H, Sub-Leaf Index 2 is called to enumerate SGX resources. Change-Id: I62f3fd8527e27040336c52bc78768035f4b7e5a9 Signed-off-by: Pratik Prajapati <pratikkumar.v.prajapati@intel.com> Reviewed-on: https://review.coreboot.org/21966 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/soc/intel')
-rw-r--r--src/soc/intel/common/block/include/intelblocks/msr.h9
-rw-r--r--src/soc/intel/common/block/include/intelblocks/sgx.h5
-rw-r--r--src/soc/intel/common/block/sgx/sgx.c37
3 files changed, 51 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/include/intelblocks/msr.h b/src/soc/intel/common/block/include/intelblocks/msr.h
index 6236915c53..45f201c7da 100644
--- a/src/soc/intel/common/block/include/intelblocks/msr.h
+++ b/src/soc/intel/common/block/include/intelblocks/msr.h
@@ -130,4 +130,13 @@
#define PRMRR_SUPPORTED (1<<12)
#define SGX_SUPPORTED (1<<2)
+/* Intel SDM: Table 36-6.
+ * CPUID Leaf 12H, Sub-Leaf Index 2 or Higher for enumeration of
+ * SGX Resources. Same Table mentions about return values of the CPUID */
+#define SGX_RESOURCE_ENUM_CPUID_LEAF (0x12)
+#define SGX_RESOURCE_ENUM_CPUID_SUBLEAF (0x2)
+#define SGX_RESOURCE_ENUM_BIT (0x1)
+#define SGX_RESOURCE_MASK_LO (0xfffff000UL)
+#define SGX_RESOURCE_MASK_HI (0xfffffUL)
+
#endif /* SOC_INTEL_COMMON_MSR_H */
diff --git a/src/soc/intel/common/block/include/intelblocks/sgx.h b/src/soc/intel/common/block/include/intelblocks/sgx.h
index f1dd8912fe..3c87b434c2 100644
--- a/src/soc/intel/common/block/include/intelblocks/sgx.h
+++ b/src/soc/intel/common/block/include/intelblocks/sgx.h
@@ -16,6 +16,8 @@
#ifndef SOC_INTEL_COMMON_BLOCK_SGX_H
#define SOC_INTEL_COMMON_BLOCK_SGX_H
+#include <soc/nvs.h>
+
struct sgx_param {
uint8_t enable;
};
@@ -42,4 +44,7 @@ void sgx_configure(void);
* returns 0, if able to get SGX params; otherwise returns -1 */
int soc_fill_sgx_param(struct sgx_param *sgx_param);
+/* Fill GNVS data with SGX status, EPC base and length */
+void sgx_fill_gnvs(global_nvs_t *gnvs);
+
#endif /* SOC_INTEL_COMMON_BLOCK_SGX_H */
diff --git a/src/soc/intel/common/block/sgx/sgx.c b/src/soc/intel/common/block/sgx/sgx.c
index 3c3ab4d114..86789fa633 100644
--- a/src/soc/intel/common/block/sgx/sgx.c
+++ b/src/soc/intel/common/block/sgx/sgx.c
@@ -29,6 +29,14 @@
static bool sgx_param_valid;
static struct sgx_param g_sgx_param;
+static inline uint64_t sgx_resource(uint32_t low, uint32_t high)
+{
+ uint64_t val;
+ val = (uint64_t)(high & SGX_RESOURCE_MASK_HI) << 32;
+ val |= low & SGX_RESOURCE_MASK_LO;
+ return val;
+}
+
static const struct sgx_param *get_sgx_param(void)
{
if (sgx_param_valid)
@@ -222,3 +230,32 @@ void sgx_configure(void)
if (is_prmrr_approved())
activate_sgx();
}
+
+void sgx_fill_gnvs(global_nvs_t *gnvs)
+{
+ struct cpuid_result cpuid_regs;
+
+ if (!soc_sgx_enabled() || !is_sgx_supported()) {
+ printk(BIOS_DEBUG,
+ "SGX: not enabled or not supported. skip gnvs fill\n");
+ return;
+ }
+
+ /* Get EPC base and size.
+ * Intel SDM: Table 36-6. CPUID Leaf 12H, Sub-Leaf Index 2 or
+ * Higher for enumeration of SGX Resources. Same Table mentions
+ * about return values of the CPUID */
+ cpuid_regs = cpuid_ext(SGX_RESOURCE_ENUM_CPUID_LEAF,
+ SGX_RESOURCE_ENUM_CPUID_SUBLEAF);
+
+ if (cpuid_regs.eax & SGX_RESOURCE_ENUM_BIT) {
+ /* EPC section enumerated */
+ gnvs->ecps = 1;
+ gnvs->emna = sgx_resource(cpuid_regs.eax, cpuid_regs.ebx);
+ gnvs->elng = sgx_resource(cpuid_regs.ecx, cpuid_regs.edx);
+ }
+
+ printk(BIOS_DEBUG,
+ "SGX: gnvs ECP status = %d base = 0x%llx len = 0x%llx\n",
+ gnvs->ecps, gnvs->emna, gnvs->elng);
+}