summaryrefslogtreecommitdiff
path: root/src/cpu/x86/smm/smi_trigger.c
blob: e4c6dc94170afc7f2cce96c71e8856b3037715c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
/* SPDX-License-Identifier: GPL-2.0-only */

#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/smm.h>

static void apmc_log(const char *fn, u8 cmd)
{
	switch (cmd) {
	case APM_CNT_ACPI_DISABLE:
		printk(BIOS_DEBUG, "%s: Disabling ACPI.\n", fn);
		break;
	case APM_CNT_ACPI_ENABLE:
		printk(BIOS_DEBUG, "%s: Enabling ACPI.\n", fn);
		break;
	case APM_CNT_FINALIZE:
		printk(BIOS_DEBUG, "%s: Finalizing SMM.\n", fn);
		break;
	case APM_CNT_ELOG_GSMI:
		break;
	case APM_CNT_SMMSTORE:
		break;
	case APM_CNT_SMMINFO:
		break;
	default:
		printk(BIOS_DEBUG, "%s: Unknown APMC 0x%02x.\n", fn, cmd);
		break;
	}
}

int apm_control(u8 cmd)
{
	/* Never proceed inside SMI handler or without one. */
	if (ENV_SMM || !CONFIG(HAVE_SMI_HANDLER))
		return -1;

	apmc_log(__func__, cmd);

	/* Now raise the SMI. */
	outb(cmd, APM_CNT);

	printk(BIOS_DEBUG, "APMC done.\n");
	return 0;
}

u8 apm_get_apmc(void)
{
	/* Emulate B2 register as the FADT / Linux expects it */
	u8 cmd = inb(APM_CNT);

	apmc_log("SMI#", cmd);
	return cmd;
}