| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <amdblocks/smm.h> |
| #include <cpu/amd/amd64_save_state.h> |
| #include <cpu/x86/smm.h> |
| #include <elog.h> |
| #include <smmstore.h> |
| #include <types.h> |
| |
| /* bits in smm_io_trap */ |
| #define SMM_IO_TRAP_PORT_OFFSET 16 |
| #define SMM_IO_TRAP_PORT_ADDRESS_MASK 0xffff |
| #define SMM_IO_TRAP_RW (1 << 0) |
| #define SMM_IO_TRAP_VALID (1 << 1) |
| |
| static inline u16 get_io_address(u32 info) |
| { |
| return ((info >> SMM_IO_TRAP_PORT_OFFSET) & |
| SMM_IO_TRAP_PORT_ADDRESS_MASK); |
| } |
| |
| static void *find_save_state(int cmd) |
| { |
| unsigned int core; |
| amd64_smm_state_save_area_t *state; |
| u32 smm_io_trap; |
| u8 reg_al; |
| |
| /* Check all nodes looking for the one that issued the IO */ |
| for (core = 0; core < CONFIG_MAX_CPUS; core++) { |
| state = smm_get_save_state(core); |
| smm_io_trap = state->smm_io_trap_offset; |
| /* Check for Valid IO Trap Word (bit1==1) */ |
| if (!(smm_io_trap & SMM_IO_TRAP_VALID)) |
| continue; |
| /* Make sure it was a write (bit0==0) */ |
| if (smm_io_trap & SMM_IO_TRAP_RW) |
| continue; |
| /* Check for APMC IO port */ |
| if (pm_acpi_smi_cmd_port() != get_io_address(smm_io_trap)) |
| continue; |
| /* Check AL against the requested command */ |
| reg_al = state->rax; |
| if (reg_al == cmd) |
| return state; |
| } |
| return NULL; |
| } |
| |
| void handle_smi_gsmi(void) |
| { |
| u8 sub_command; |
| amd64_smm_state_save_area_t *io_smi; |
| u32 reg_ebx; |
| |
| io_smi = find_save_state(APM_CNT_ELOG_GSMI); |
| if (!io_smi) |
| return; |
| /* Command and return value in EAX */ |
| sub_command = (io_smi->rax >> 8) & 0xff; |
| |
| /* Parameter buffer in EBX */ |
| reg_ebx = io_smi->rbx; |
| |
| /* drivers/elog/gsmi.c */ |
| io_smi->rax = gsmi_exec(sub_command, ®_ebx); |
| } |
| |
| void handle_smi_store(void) |
| { |
| u8 sub_command; |
| amd64_smm_state_save_area_t *io_smi; |
| u32 reg_ebx; |
| |
| io_smi = find_save_state(APM_CNT_SMMSTORE); |
| if (!io_smi) |
| return; |
| /* Command and return value in EAX */ |
| sub_command = (io_smi->rax >> 8) & 0xff; |
| |
| /* Parameter buffer in EBX */ |
| reg_ebx = io_smi->rbx; |
| |
| /* drivers/smmstore/smi.c */ |
| io_smi->rax = smmstore_exec(sub_command, (void *)(uintptr_t)reg_ebx); |
| } |