| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <commonlib/helpers.h> |
| #include <console/console.h> |
| #include <cpu/amd/amd64_save_state.h> |
| #include <cpu/intel/smm_reloc.h> |
| #include <cpu/x86/legacy_save_state.h> |
| #include <cpu/x86/mp.h> |
| #include <cpu/x86/smm.h> |
| #include <mainboard/emulation/qemu-i440fx/fw_cfg.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| 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"); |
| |
| smm_subregion(SMM_SUBREGION_HANDLER, perm_smbase, perm_smsize); |
| |
| smm_open(); |
| |
| /* FIXME: on X86_64 the save state size is smaller than the size of the SMM stub */ |
| *smm_save_state_size = sizeof(amd64_smm_state_save_area_t); |
| printk(BIOS_DEBUG, "Save state size: 0x%zx bytes\n", *smm_save_state_size); |
| } |
| |
| /* |
| * 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. |
| */ |
| |
| union __packed save_state { |
| amd64_smm_state_save_area_t amd64; |
| struct { |
| char _reserved[sizeof(amd64_smm_state_save_area_t) |
| - sizeof(legacy_smm_state_save_area_t)]; |
| legacy_smm_state_save_area_t legacy; |
| }; |
| }; |
| |
| _Static_assert(sizeof(union save_state) == sizeof(amd64_smm_state_save_area_t), |
| "Incorrect save state union size"); |
| |
| _Static_assert(offsetof(union save_state, amd64.smm_revision) |
| == offsetof(union save_state, legacy.smm_revision), |
| "Incompatible SMM save state revision offset"); |
| |
| static void relocation_handler(int cpu, uintptr_t curr_smbase, |
| uintptr_t staggered_smbase) |
| { |
| union save_state *save_state = |
| (void *)(curr_smbase + SMM_DEFAULT_SIZE - sizeof(*save_state)); |
| |
| u32 smbase = staggered_smbase; |
| |
| /* The SMM save state revision is always at a compatible offset */ |
| const u32 revision = save_state->legacy.smm_revision; |
| switch (revision) { |
| case 0x00020000: |
| save_state->legacy.smbase = smbase; |
| break; |
| case 0x00020064: |
| save_state->amd64.smbase = smbase; |
| break; |
| default: |
| printk(BIOS_ERR, "Unknown SMM revision 0x%x, not relocating SMM\n", revision); |
| return; |
| }; |
| |
| printk(BIOS_DEBUG, "In relocation handler: cpu %d\n", cpu); |
| printk(BIOS_DEBUG, "SMM revision: 0x%08x\n", revision); |
| printk(BIOS_DEBUG, "New SMBASE=0x%08x\n", smbase); |
| } |
| |
| static void post_mp_init(void) |
| { |
| /* Limit access to SMRAM to SMM module. */ |
| smm_close(); |
| |
| /* Now that all APs have been relocated as well as the BSP let SMIs start flowing. */ |
| global_smi_enable(); |
| |
| /* Lock down the SMRAM space. */ |
| smm_lock(); |
| } |
| |
| const struct mp_ops mp_ops_with_smm = { |
| .get_cpu_count = fw_cfg_max_cpus, |
| .get_smm_info = get_smm_info, |
| .pre_mp_smm_init = smm_southbridge_clear_state, |
| .relocation_handler = relocation_handler, |
| .post_mp_init = post_mp_init, |
| }; |