diff options
Diffstat (limited to 'src/soc/intel/broadwell/cpu/smmrelocate.c')
| -rw-r--r-- | src/soc/intel/broadwell/cpu/smmrelocate.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/src/soc/intel/broadwell/cpu/smmrelocate.c b/src/soc/intel/broadwell/cpu/smmrelocate.c new file mode 100644 index 0000000000..3d4162abd0 --- /dev/null +++ b/src/soc/intel/broadwell/cpu/smmrelocate.c @@ -0,0 +1,264 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <types.h> +#include <string.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pci_ops.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> +#include <soc/cpu.h> +#include <soc/msr.h> +#include <soc/pci_devs.h> +#include <soc/systemagent.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 PRMRR and SMRR MSRs based on indicated support. */ + mtrr_cap = rdmsr(MTRR_CAP_MSR); + if (mtrr_cap.lo & SMRR_SUPPORTED) + write_smrr(relo_params); + + if (mtrr_cap.lo & PRMRR_SUPPORTED) { + write_prmrr(relo_params); + /* UNCORE_PRMRR msrs are package level. Therefore, only + * configure these MSRs on the BSP. */ + if (cpu == 0) + write_uncore_prmrr(relo_params); + } +} + +static void fill_in_relocation_params(struct smm_relocation_params *params) +{ + uintptr_t tseg_base; + size_t tseg_size; + u32 prmrr_base; + u32 prmrr_size; + int phys_bits; + /* All range registers are aligned to 4KiB */ + const u32 rmask = ~((1 << 12) - 1); + + /* Some of the range registers are dependent on the number of physical + * address bits supported. */ + phys_bits = cpuid_eax(0x80000008) & 0xff; + + /* The range bounded by the TSEGMB and BGSM registers encompasses the + * SMRAM range as well as the IED range. However, the SMRAM available + * to the handler is 4MiB since the IEDRAM lives TSEGMB + 4MiB. + */ + smm_region(&tseg_base, &tseg_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; + + smm_subregion(SMM_SUBREGION_CHIPSET, ¶ms->ied_base, ¶ms->ied_size); + + /* The PRMRR and UNCORE_PRMRR are at IEDBASE + 2MiB */ + prmrr_base = (params->ied_base + (2 << 20)) & rmask; + prmrr_size = params->ied_size - (2 << 20); + + /* PRMRR has 46 bits of valid address aligned to 4KiB. It's dependent + * on the number of physical address bits supported. */ + params->prmrr_base.lo = prmrr_base | MTRR_TYPE_WRBACK; + params->prmrr_base.hi = 0; + params->prmrr_mask.lo = (~(prmrr_size - 1) & rmask) + | MTRR_PHYS_MASK_VALID; + params->prmrr_mask.hi = (1 << (phys_bits - 32)) - 1; + + /* UNCORE_PRMRR has 39 bits of valid address aligned to 4KiB. */ + params->uncore_prmrr_base.lo = prmrr_base; + params->uncore_prmrr_base.hi = 0; + params->uncore_prmrr_mask.lo = (~(prmrr_size - 1) & rmask) | + MTRR_PHYS_MASK_VALID; + params->uncore_prmrr_mask.hi = (1 << (39 - 32)) - 1; +} + +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_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); + + 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"); +} + +/* 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 (smm_reloc_params.smm_save_state_in_msrs) + smm_initiate_relocation_parallel(); + else if (!boot_cpu()) + smm_initiate_relocation(); +} + +void smm_lock(void) +{ + struct device *sa_dev = pcidev_path_on_root(SA_DEVFN_ROOT); + /* 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"); + pci_write_config8(sa_dev, SMRAM, D_LCK | G_SMRAME | C_BASE_SEG); +} |