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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <cpu/intel/em64t101_save_state.h>
#include <cpu/intel/smm_reloc.h>
#include <cpu/x86/mp.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <smp/node.h>
#include <soc/cpu.h>
#include <soc/msr.h>
#include <soc/pci_devs.h>
#include <soc/soc_chip.h>
#include <string.h>
#include <types.h>
static void update_save_state(int cpu, uintptr_t curr_smbase,
uintptr_t staggered_smbase,
struct smm_relocation_params *relo_params)
{
u32 smbase;
u32 iedbase;
/*
* The relocated handler runs with all CPUs concurrently. Therefore
* stagger the entry points adjusting SMBASE downwards by save state
* size * CPU num.
*/
smbase = staggered_smbase;
iedbase = relo_params->ied_base;
printk(BIOS_DEBUG, "New SMBASE=0x%08x IEDBASE=0x%08x\n",
smbase, iedbase);
/*
* All threads need to set IEDBASE and SMBASE to the relocated
* handler region. However, the save state location depends on the
* smm_save_state_in_msrs field in the relocation parameters. If
* smm_save_state_in_msrs is non-zero then the CPUs are relocating
* the SMM handler in parallel, and each CPUs save state area is
* located in their respective MSR space. If smm_save_state_in_msrs
* is zero then the SMM relocation is happening serially so the
* save state is at the same default location for all CPUs.
*/
if (relo_params->smm_save_state_in_msrs) {
msr_t smbase_msr;
msr_t iedbase_msr;
smbase_msr.lo = smbase;
smbase_msr.hi = 0;
/*
* According the BWG the IEDBASE MSR is in bits 63:32. It's
* not clear why it differs from the SMBASE MSR.
*/
iedbase_msr.lo = 0;
iedbase_msr.hi = iedbase;
wrmsr(SMBASE_MSR, smbase_msr);
wrmsr(IEDBASE_MSR, iedbase_msr);
} else {
em64t101_smm_state_save_area_t *save_state;
save_state = (void *)(curr_smbase + SMM_DEFAULT_SIZE -
sizeof(*save_state));
save_state->smbase = smbase;
save_state->iedbase = iedbase;
}
}
/* Returns 1 if SMM MSR save state was set. */
static int bsp_setup_msr_save_state(struct smm_relocation_params *relo_params)
{
msr_t smm_mca_cap;
smm_mca_cap = rdmsr(SMM_MCA_CAP_MSR);
if (smm_mca_cap.hi & SMM_CPU_SVRSTR_MASK) {
msr_t smm_feature_control;
smm_feature_control = rdmsr(SMM_FEATURE_CONTROL_MSR);
smm_feature_control.hi = 0;
smm_feature_control.lo |= SMM_CPU_SAVE_EN;
wrmsr(SMM_FEATURE_CONTROL_MSR, smm_feature_control);
relo_params->smm_save_state_in_msrs = 1;
}
return relo_params->smm_save_state_in_msrs;
}
/*
* The relocation work is actually performed in SMM context, but the code
* resides in the ramstage module. This occurs by trampolining from the default
* SMRAM entry point to here.
*/
void smm_relocation_handler(int cpu, uintptr_t curr_smbase,
uintptr_t staggered_smbase)
{
msr_t mtrr_cap;
struct smm_relocation_params *relo_params = &smm_reloc_params;
printk(BIOS_DEBUG, "In relocation handler: CPU %d\n", cpu);
/*
* Determine if the processor supports saving state in MSRs. If so,
* enable it before the non-BSPs run so that SMM relocation can occur
* in parallel in the non-BSP CPUs.
*/
if (cpu == 0) {
/*
* If smm_save_state_in_msrs is 1 then that means this is the
* 2nd time through the relocation handler for the BSP.
* Parallel SMM handler relocation is taking place. However,
* it is desired to access other CPUs save state in the real
* SMM handler. Therefore, disable the SMM save state in MSRs
* feature.
*/
if (relo_params->smm_save_state_in_msrs) {
msr_t smm_feature_control;
smm_feature_control = rdmsr(SMM_FEATURE_CONTROL_MSR);
smm_feature_control.lo &= ~SMM_CPU_SAVE_EN;
wrmsr(SMM_FEATURE_CONTROL_MSR, smm_feature_control);
} else if (bsp_setup_msr_save_state(relo_params))
/*
* Just return from relocation handler if MSR save
* state is enabled. In that case the BSP will come
* back into the relocation handler to setup the new
* SMBASE as well disabling SMM save state in MSRs.
*/
return;
}
/* Make appropriate changes to the save state map. */
update_save_state(cpu, curr_smbase, staggered_smbase, relo_params);
/* Write SMRR MSRs based on indicated support. */
mtrr_cap = rdmsr(MTRR_CAP_MSR);
if (mtrr_cap.lo & SMRR_SUPPORTED)
write_smrr(relo_params);
}
static void fill_in_relocation_params(struct smm_relocation_params *params)
{
uintptr_t tseg_base;
size_t tseg_size;
/* All range registers are aligned to 4KiB */
const u32 rmask = ~(4 * KiB - 1);
smm_region(&tseg_base, &tseg_size);
if (!IS_ALIGNED(tseg_base, tseg_size)) {
printk(BIOS_WARNING, "TSEG base not aligned with TSEG size! Not setting SMRR\n");
return;
}
smm_subregion(SMM_SUBREGION_CHIPSET, ¶ms->ied_base, ¶ms->ied_size);
/* SMRR has 32-bits of valid address aligned to 4KiB. */
params->smrr_base.lo = (tseg_base & rmask) | MTRR_TYPE_WRBACK;
params->smrr_base.hi = 0;
params->smrr_mask.lo = (~(tseg_size - 1) & rmask) | MTRR_PHYS_MASK_VALID;
params->smrr_mask.hi = 0;
}
static void setup_ied_area(struct smm_relocation_params *params)
{
char *ied_base;
struct ied_header ied = {
.signature = "INTEL RSVD",
.size = params->ied_size,
.reserved = {0},
};
ied_base = (void *)params->ied_base;
printk(BIOS_DEBUG, "IED base = 0x%08x\n", (u32)params->ied_base);
printk(BIOS_DEBUG, "IED size = 0x%08x\n", (u32)params->ied_size);
/* Place IED header at IEDBASE. */
memcpy(ied_base, &ied, sizeof(ied));
/* Zero out 32KiB at IEDBASE + 1MiB */
memset(ied_base + 1 * MiB, 0, 32 * KiB);
}
void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
size_t *smm_save_state_size)
{
printk(BIOS_DEBUG, "Setting up SMI for CPU\n");
fill_in_relocation_params(&smm_reloc_params);
smm_subregion(SMM_SUBREGION_HANDLER, perm_smbase, perm_smsize);
if (smm_reloc_params.ied_size)
setup_ied_area(&smm_reloc_params);
*smm_save_state_size = sizeof(em64t101_smm_state_save_area_t);
}
void smm_initialize(void)
{
/* Clear the SMM state in the southbridge. */
smm_southbridge_clear_state();
/*
* Run the relocation handler for on the BSP to check and set up
* parallel SMM relocation.
*/
smm_initiate_relocation();
if (smm_reloc_params.smm_save_state_in_msrs)
printk(BIOS_DEBUG, "Doing parallel SMM relocation.\n");
}
void smm_relocate(void)
{
/*
* If smm_save_state_in_msrs is non-zero then parallel SMM relocation
* shall take place. Run the relocation handler a second time on the
* BSP to do * the final move. For APs, a relocation handler always
* needs to be run.
*/
if (smm_reloc_params.smm_save_state_in_msrs)
smm_initiate_relocation_parallel();
else if (!boot_cpu())
smm_initiate_relocation();
}
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