/* SPDX-License-Identifier: GPL-2.0-only */ #include <console/console.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; }