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, 0 insertions, 264 deletions
diff --git a/src/soc/intel/broadwell/cpu/smmrelocate.c b/src/soc/intel/broadwell/cpu/smmrelocate.c deleted file mode 100644 index 3d4162abd0..0000000000 --- a/src/soc/intel/broadwell/cpu/smmrelocate.c +++ /dev/null @@ -1,264 +0,0 @@ -/* 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); -} |