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/* SPDX-License-Identifier: BSD-2-Clause */
#include <security/intel/stm/StmApi.h>
#include <security/intel/stm/SmmStm.h>
#include <security/intel/stm/StmPlatformResource.h>
#include <security/tpm/tspi.h>
#include <cpu/x86/smm.h>
#include <cpu/x86/msr.h>
#include <cbfs.h>
#include <console/console.h>
#include <stdbool.h>
#include <stdint.h>
#include <arch/rom_segs.h>
/*
* Load STM image to MSEG
*
* @retval SUCCESS STM is loaded to MSEG
*/
int load_stm_image(uintptr_t mseg)
{
int status;
void *mseg_base;
uint32_t stm_buffer_size;
uint32_t stm_image_size;
bool stm_status;
STM_HEADER *stm_header;
// Extract STM image from FV
mseg_base = (void *)mseg;
stm_buffer_size = CONFIG_MSEG_SIZE;
stm_image_size = 0;
memset((void *)mseg_base, 0, CONFIG_MSEG_SIZE); // clear the mseg
stm_image_size = cbfs_load("stm.bin", mseg_base, stm_buffer_size);
printk(BIOS_DEBUG, "STM:loaded into mseg: 0x%p size: %u\n", mseg_base,
stm_image_size);
/* status is number of bytes loaded */
stm_status = stm_check_stm_image(mseg_base, stm_image_size);
if (!stm_status) {
printk(BIOS_DEBUG, "STM: Error in STM image\n");
return -1;
}
stm_header = mseg_base;
stm_gen_4g_pagetable_x64((uint32_t)mseg_base
+ stm_header->hw_stm_hdr.cr3_offset);
// Debug stuff
printk(BIOS_DEBUG,
"STM: Header-Revision %d Features 0x%08x Cr3Offset 0x%08x\n",
stm_header->hw_stm_hdr.stm_header_revision,
stm_header->hw_stm_hdr.monitor_features,
stm_header->hw_stm_hdr.cr3_offset);
printk(BIOS_DEBUG,
"STM: Header-StaticImageSize: %d Cr3Location: 0x%08x\n",
stm_header->sw_stm_hdr.static_image_size,
((uint32_t)mseg_base + stm_header->hw_stm_hdr.cr3_offset));
status = 0; // always return good for now
return status;
}
struct descriptor {
uint16_t limit;
uintptr_t base;
} __packed;
static void read_gdtr(struct descriptor *gdtr)
{
__asm__ __volatile__("sgdt %0" : "=m"(*gdtr));
}
void setup_smm_descriptor(void *smbase, int32_t apic_id, int32_t entry32_off)
{
struct descriptor gdtr;
void *smbase_processor;
//msr_t smbase_msr;
TXT_PROCESSOR_SMM_DESCRIPTOR *psd;
smbase_processor = (void *)SMM_DEFAULT_BASE;//we are here
psd = smbase + SMM_PSD_OFFSET;
printk(BIOS_DEBUG,
"STM: Smm Descriptor setup: Smbase: %p Smbase_processor: %p Psd: %p\n",
smbase,
smbase_processor,
psd);
memset(psd, 0, sizeof(TXT_PROCESSOR_SMM_DESCRIPTOR));
memcpy(&psd->signature, TXT_PROCESSOR_SMM_DESCRIPTOR_SIGNATURE, 8);
psd->smm_descriptor_ver_major =
TXT_PROCESSOR_SMM_DESCRIPTOR_VERSION_MAJOR;
psd->smm_descriptor_ver_minor =
TXT_PROCESSOR_SMM_DESCRIPTOR_VERSION_MINOR;
psd->smm_smi_handler_rip =
(uint64_t)((uintptr_t)smbase + SMM_ENTRY_OFFSET +
entry32_off);
psd->local_apic_id = apic_id;
psd->size = sizeof(TXT_PROCESSOR_SMM_DESCRIPTOR);
psd->acpi_rsdp = 0;
psd->bios_hw_resource_requirements_ptr =
(uint64_t)((uintptr_t)get_stm_resource());
psd->smm_cs = ROM_CODE_SEG;
psd->smm_ds = ROM_DATA_SEG;
psd->smm_ss = ROM_DATA_SEG;
psd->smm_other_segment = ROM_DATA_SEG;
psd->smm_tr = SMM_TASK_STATE_SEG;
// At this point the coreboot smm_stub is relative to the default
// smbase and not the one for the smi handler in tseg. So we have
// to adjust the gdtr.base
read_gdtr(&gdtr);
gdtr.base -= (uintptr_t)smbase_processor;
gdtr.base += (uintptr_t)smbase;
psd->smm_gdt_ptr = gdtr.base;
psd->smm_gdt_size = gdtr.limit + 1; // the stm will subtract, so add
printk(BIOS_DEBUG, "STM: Smm Descriptor setup complete - Smbase: %p Psd: %p\n",
smbase, psd);
}
extern uint8_t *stm_resource_heap;
#define FXSAVE_SIZE 512
static int stm_load_status = 0;
void stm_setup(uintptr_t mseg, int cpu, uintptr_t smbase,
uintptr_t base_smbase, uint32_t offset32)
{
msr_t InitMseg;
msr_t MsegChk;
msr_t vmx_basic;
uintptr_t addr_calc; // used to calculate the stm resource heap area
printk(BIOS_DEBUG, "STM: set up for cpu %d\n", cpu);
vmx_basic = rdmsr(IA32_VMX_BASIC_MSR);
// Does this processor support an STM?
if ((vmx_basic.hi & VMX_BASIC_HI_DUAL_MONITOR) != VMX_BASIC_HI_DUAL_MONITOR) {
printk(BIOS_WARNING, "STM: not supported on CPU %d\n", cpu);
return;
}
// This code moved here because paralled SMM set can cause
// some processor to receive a bad value
// calculate the location in SMRAM
addr_calc = mseg - CONFIG_BIOS_RESOURCE_LIST_SIZE;
stm_resource_heap = (uint8_t *)addr_calc;
if (cpu == 0) {
// need to create the BIOS resource list once
printk(BIOS_DEBUG, "STM: stm_resource_heap located at %p\n",
stm_resource_heap);
//setup the list
add_resources_cmd();
stm_load_status = load_stm_image(mseg);
}
if (stm_load_status == 0) {
// enable STM for this cpu
InitMseg.lo = mseg | IA32_SMM_MONITOR_VALID;
InitMseg.hi = 0;
wrmsr(IA32_SMM_MONITOR_CTL_MSR, InitMseg);
MsegChk = rdmsr(IA32_SMM_MONITOR_CTL_MSR);
printk(BIOS_DEBUG, "STM: MSEG Initialized (%d) 0x%08x 0x%08x\n",
cpu, MsegChk.hi, MsegChk.lo);
// setup the descriptor for this cpu
setup_smm_descriptor((void *)smbase, cpu, offset32);
} else {
printk(BIOS_DEBUG,
"STM: Error in STM load, STM not enabled: %d\n",
cpu);
}
}
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