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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpigen.h>
#include <arch/cpu.h>
#include <console/console.h>
#include <intelblocks/acpi.h>
#include <intelblocks/sgx.h>
#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
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;
}
void sgx_fill_ssdt(void)
{
bool epcs = false;
struct cpuid_result cpuid_regs;
uint64_t emna = 0, elng = 0;
if (is_sgx_supported()) {
/*
* Get EPC base and size.
* Intel SDM: Table 36-6. CPUID Leaf 12H, Sub-Leaf Index 2 or
* higher for enumeration of SGX resources
*/
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 */
epcs = true;
emna = sgx_resource(cpuid_regs.eax, cpuid_regs.ebx);
elng = sgx_resource(cpuid_regs.ecx, cpuid_regs.edx);
}
printk(BIOS_DEBUG, "SGX: EPC status = %d base = 0x%llx len = 0x%llx\n",
epcs, emna, elng);
} else {
printk(BIOS_DEBUG, "SGX: not supported.\n");
}
acpigen_write_scope("\\_SB.EPC");
{
acpigen_write_name_byte("EPCS", epcs);
acpigen_write_name_qword("EMNA", emna);
acpigen_write_name_qword("ELNG", elng);
}
acpigen_pop_len();
}
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