| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <amdblocks/smm.h> |
| #include <console/console.h> |
| #include <cpu/amd/amd64_save_state.h> |
| #include <cpu/amd/msr.h> |
| #include <cpu/cpu.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/x86/smm.h> |
| #include <types.h> |
| |
| static struct smm_relocation_params smm_reloc_params; |
| |
| static void fill_in_relocation_params(struct smm_relocation_params *params) |
| { |
| uintptr_t tseg_base; |
| size_t tseg_size; |
| |
| smm_region(&tseg_base, &tseg_size); |
| |
| params->tseg_base.lo = ALIGN_DOWN(tseg_base, 128 * KiB); |
| params->tseg_base.hi = 0; |
| params->tseg_mask.lo = ALIGN_DOWN(~(tseg_size - 1), 128 * KiB); |
| params->tseg_mask.hi = ((1 << (cpu_phys_address_size() - 32)) - 1); |
| |
| params->tseg_mask.lo |= SMM_TSEG_WB; |
| } |
| |
| void get_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); |
| *smm_save_state_size = sizeof(amd64_smm_state_save_area_t); |
| } |
| |
| void smm_relocation_handler(int cpu, uintptr_t curr_smbase, uintptr_t staggered_smbase) |
| { |
| struct smm_relocation_params *relo_params = &smm_reloc_params; |
| amd64_smm_state_save_area_t *smm_state; |
| |
| wrmsr(SMM_ADDR_MSR, relo_params->tseg_base); |
| wrmsr(SMM_MASK_MSR, relo_params->tseg_mask); |
| |
| smm_state = (void *)(SMM_AMD64_SAVE_STATE_OFFSET + curr_smbase); |
| smm_state->smbase = staggered_smbase; |
| } |