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;
}
|
