| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <cpu/x86/mtrr.h> |
| #include <cpu/x86/mp.h> |
| #include <amdblocks/cpu.h> |
| #include <amdblocks/smm.h> |
| #include <console/console.h> |
| #include <cpu/amd/amd64_save_state.h> |
| #include <cpu/amd/msr.h> |
| #include <cpu/amd/mtrr.h> |
| #include <cpu/cpu.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/x86/smm.h> |
| #include <types.h> |
| |
| /* AP MTRRs will be synced to the BSP in the SIPI vector so set them up before MP init. */ |
| static void pre_mp_init(void) |
| { |
| const msr_t syscfg = rdmsr(SYSCFG_MSR); |
| if (syscfg.lo & SYSCFG_MSR_TOM2WB) |
| x86_setup_mtrrs_with_detect_no_above_4gb(); |
| else |
| x86_setup_mtrrs_with_detect(); |
| x86_mtrr_check(); |
| } |
| |
| static 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"); |
| |
| uintptr_t tseg_base; |
| size_t tseg_size; |
| |
| smm_region(&tseg_base, &tseg_size); |
| |
| if (!IS_ALIGNED(tseg_base, tseg_size)) { |
| printk(BIOS_ERR, "TSEG base not aligned to TSEG size\n"); |
| return; |
| } |
| /* Minimum granularity for TSEG MSRs */ |
| if (tseg_size < 128 * KiB) { |
| printk(BIOS_ERR, "TSEG size (0x%zx) too small\n", tseg_size); |
| return; |
| } |
| |
| |
| smm_subregion(SMM_SUBREGION_HANDLER, perm_smbase, perm_smsize); |
| *smm_save_state_size = sizeof(amd64_smm_state_save_area_t); |
| } |
| |
| static void tseg_valid(void) |
| { |
| msr_t mask = rdmsr(SMM_MASK_MSR); |
| mask.lo |= SMM_TSEG_VALID; |
| |
| wrmsr(SMM_MASK_MSR, mask); |
| } |
| |
| static void smm_relocation_handler(void) |
| { |
| uintptr_t tseg_base; |
| size_t tseg_size; |
| |
| smm_region(&tseg_base, &tseg_size); |
| |
| msr_t msr; |
| msr.lo = tseg_base; |
| msr.hi = 0; |
| wrmsr(SMM_ADDR_MSR, msr); |
| |
| msr.lo = ~(tseg_size - 1); |
| msr.lo |= SMM_TSEG_WB; |
| msr.hi = (1 << (cpu_phys_address_size() - 32)) - 1; |
| wrmsr(SMM_MASK_MSR, msr); |
| |
| uintptr_t smbase = smm_get_cpu_smbase(cpu_index()); |
| msr_t smm_base = { |
| .hi = 0, |
| .lo = smbase |
| }; |
| wrmsr(SMM_BASE_MSR, smm_base); |
| |
| tseg_valid(); |
| lock_smm(); |
| } |
| |
| const struct mp_ops amd_mp_ops_with_smm = { |
| .pre_mp_init = pre_mp_init, |
| .get_cpu_count = get_cpu_count, |
| .get_smm_info = get_smm_info, |
| .per_cpu_smm_trigger = smm_relocation_handler, |
| .post_mp_init = global_smi_enable, |
| }; |