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/* SPDX-License-Identifier: GPL-2.0-only */
/* SMM relocation for i945-ivybridge. */
#include <assert.h>
#include <types.h>
#include <string.h>
#include <device/device.h>
#include <device/pci.h>
#include <commonlib/helpers.h>
#include <cpu/x86/mp.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/smm.h>
#include <cpu/intel/em64t101_save_state.h>
#include <cpu/intel/smm_reloc.h>
#include <console/console.h>
#include <smp/node.h>
#define SMRR_SUPPORTED (1 << 11)
#define D_OPEN (1 << 6)
#define D_CLS (1 << 5)
#define D_LCK (1 << 4)
#define G_SMRAME (1 << 3)
#define C_BASE_SEG ((0 << 2) | (1 << 1) | (0 << 0))
/* On model_6fx, model_1067x and model_106cx SMRR functions slightly
differently. The MSR are at different location from the rest
and need to be explicitly enabled in IA32_FEATURE_CONTROL MSR. */
bool cpu_has_alternative_smrr(void)
{
struct cpuinfo_x86 c;
get_fms(&c, cpuid_eax(1));
if (c.x86 != 6)
return false;
switch (c.x86_model) {
case 0xf:
case 0x17: /* core2 */
case 0x1c: /* Bonnell */
return true;
default:
return false;
}
}
static void write_smrr_alt(struct smm_relocation_params *relo_params)
{
msr_t msr;
msr = rdmsr(IA32_FEATURE_CONTROL);
/* SMRR enabled and feature locked */
if (!((msr.lo & SMRR_ENABLE)
&& (msr.lo & FEATURE_CONTROL_LOCK_BIT))) {
printk(BIOS_WARNING,
"SMRR not enabled, skip writing SMRR...\n");
return;
}
printk(BIOS_DEBUG, "Writing SMRR. base = 0x%08x, mask=0x%08x\n",
relo_params->smrr_base.lo, relo_params->smrr_mask.lo);
wrmsr(CORE2_SMRR_PHYS_BASE, relo_params->smrr_base);
wrmsr(CORE2_SMRR_PHYS_MASK, relo_params->smrr_mask);
}
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 = ~((1 << 12) - 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;
}
/* 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;
/* On model_6fx and model_1067x bits [0:11] on smrr_base are reserved */
if (cpu_has_alternative_smrr())
params->smrr_base.lo &= rmask;
smm_subregion(SMM_SUBREGION_CHIPSET, ¶ms->ied_base, ¶ms->ied_size);
}
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;
/* Place IED header at IEDBASE. */
memcpy(ied_base, &ied, sizeof(ied));
/* Zero out 32KiB at IEDBASE + 1MiB */
memset(ied_base + (1 << 20), 0, (32 << 10));
}
void smm_lock(void)
{
/* LOCK the SMM memory window and enable normal SMM.
* After running this function, only a full reset can
* make the SMM registers writable again.
*/
printk(BIOS_DEBUG, "Locking SMM.\n");
northbridge_write_smram(D_LCK | G_SMRAME | C_BASE_SEG);
}
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);
/* This may not be be correct for older CPU's supported by this code,
but given that em64t101_smm_state_save_area_t is larger than the
save_state of these CPU's it works. */
*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();
}
/* 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;
/* The em64t101 save state is sufficiently compatible with older
save states with regards of smbase, smm_revision. */
em64t101_smm_state_save_area_t *save_state;
u32 smbase = staggered_smbase;
u32 iedbase = relo_params->ied_base;
printk(BIOS_DEBUG, "In relocation handler: cpu %d\n", cpu);
/* Make appropriate changes to the save state map. */
if (relo_params->ied_size)
printk(BIOS_DEBUG, "New SMBASE=0x%08x IEDBASE=0x%08x\n",
smbase, iedbase);
else
printk(BIOS_DEBUG, "New SMBASE=0x%08x\n",
smbase);
save_state = (void *)(curr_smbase + SMM_DEFAULT_SIZE -
sizeof(*save_state));
save_state->smbase = smbase;
printk(BIOS_SPEW, "SMM revision: 0x%08x\n", save_state->smm_revision);
if (save_state->smm_revision == 0x00030101)
save_state->iedbase = iedbase;
/* Write EMRR and SMRR MSRs based on indicated support. */
mtrr_cap = rdmsr(MTRR_CAP_MSR);
if (!(mtrr_cap.lo & SMRR_SUPPORTED))
return;
if (cpu_has_alternative_smrr())
write_smrr_alt(relo_params);
else
write_smrr(relo_params);
}
/*
* The default SMM entry can happen in parallel or serially. If the
* default SMM entry is done in parallel the BSP has already setup
* the saving state to each CPU's MSRs. At least one save state size
* is required for the initial SMM entry for the BSP to determine if
* parallel SMM relocation is even feasible.
*/
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 (!boot_cpu())
smm_initiate_relocation();
}
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