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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#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;
}
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