| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.h> |
| #include <cpu/x86/smm.h> |
| #include <elog.h> |
| |
| #define GSMI_RET_SUCCESS 0x00 |
| #define GSMI_RET_INVALID_PARAMETER 0x82 |
| #define GSMI_RET_UNSUPPORTED 0x83 |
| |
| #define GSMI_CMD_SET_EVENT_LOG 0x08 |
| #define GSMI_CMD_CLEAR_EVENT_LOG 0x09 |
| #define GSMI_CMD_LOG_S0IX_SUSPEND 0x0a |
| #define GSMI_CMD_LOG_S0IX_RESUME 0x0b |
| #define GSMI_CMD_HANDSHAKE_TYPE 0xc1 |
| |
| #define GSMI_HANDSHAKE_NONE 0x7f |
| #define GSMI_LOG_ENTRY_TYPE_KERNEL 0xDEAD |
| |
| struct gsmi_set_eventlog_param { |
| u32 data_ptr; |
| u32 data_len; |
| u32 type; |
| } __packed; |
| |
| struct gsmi_set_eventlog_type1 { |
| u16 type; |
| u32 instance; |
| } __packed; |
| |
| struct gsmi_clear_eventlog_param { |
| u32 percentage; |
| u32 data_type; |
| } __packed; |
| |
| void __weak elog_gsmi_cb_platform_log_wake_source(void) |
| { |
| /* Default weak implementation, does nothing. */ |
| } |
| |
| void __weak elog_gsmi_cb_mainboard_log_wake_source(void) |
| { |
| /* Default weak implementation, does nothing. */ |
| } |
| |
| /* Param is usually EBX, ret in EAX */ |
| u32 gsmi_exec(u8 command, u32 *param) |
| { |
| struct gsmi_set_eventlog_param *sel; |
| struct gsmi_set_eventlog_type1 *type1; |
| struct gsmi_clear_eventlog_param *cel; |
| u32 ret = GSMI_RET_UNSUPPORTED; |
| |
| switch (command) { |
| case GSMI_CMD_HANDSHAKE_TYPE: |
| /* Used by kernel to verify basic SMI functionality */ |
| printk(BIOS_DEBUG, "GSMI Handshake\n"); |
| ret = GSMI_HANDSHAKE_NONE; |
| break; |
| |
| case GSMI_CMD_SET_EVENT_LOG: |
| /* Look for a type1 event */ |
| sel = (struct gsmi_set_eventlog_param *)(*param); |
| if (!sel) |
| break; |
| |
| /* Make sure the input is usable */ |
| if (sel->type != 1 && sel->data_ptr != 0 && |
| sel->data_len != sizeof(struct gsmi_set_eventlog_type1)) |
| break; |
| |
| /* Event structure within the data buffer */ |
| type1 = (struct gsmi_set_eventlog_type1 *)(sel->data_ptr); |
| if (!type1) |
| break; |
| |
| printk(BIOS_DEBUG, "GSMI Set Event Log " |
| "(type=0x%x instance=0x%x)\n", |
| type1->type, type1->instance); |
| |
| if (type1->type == GSMI_LOG_ENTRY_TYPE_KERNEL) { |
| /* Special case for linux kernel shutdown reason */ |
| elog_add_event_dword(ELOG_TYPE_OS_EVENT, |
| type1->instance); |
| } else { |
| /* Add other events that may be used for testing */ |
| elog_add_event_dword(type1->type, type1->instance); |
| } |
| ret = GSMI_RET_SUCCESS; |
| break; |
| |
| case GSMI_CMD_CLEAR_EVENT_LOG: |
| /* Get parameter buffer even though we don't use it */ |
| cel = (struct gsmi_clear_eventlog_param *)(*param); |
| if (!cel) |
| break; |
| |
| printk(BIOS_DEBUG, "GSMI Clear Event Log (%u%% type=%u)\n", |
| cel->percentage, cel->data_type); |
| |
| if (elog_clear() == 0) |
| ret = GSMI_RET_SUCCESS; |
| break; |
| |
| case GSMI_CMD_LOG_S0IX_SUSPEND: |
| case GSMI_CMD_LOG_S0IX_RESUME: |
| ret = GSMI_RET_SUCCESS; |
| |
| if (command == GSMI_CMD_LOG_S0IX_SUSPEND) |
| elog_add_event(ELOG_TYPE_S0IX_ENTER); |
| else { |
| elog_add_event(ELOG_TYPE_S0IX_EXIT); |
| elog_gsmi_cb_platform_log_wake_source(); |
| elog_gsmi_cb_mainboard_log_wake_source(); |
| } |
| break; |
| |
| default: |
| printk(BIOS_DEBUG, "GSMI Unknown: 0x%02x\n", command); |
| break; |
| } |
| |
| return ret; |
| } |