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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi_gnvs.h>
#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
static void set_smm_gnvs_ptr(void);
int apm_control(u8 cmd)
{
if (!CONFIG(HAVE_SMI_HANDLER))
return -1;
switch (cmd) {
case APM_CNT_CST_CONTROL:
break;
case APM_CNT_PST_CONTROL:
break;
case APM_CNT_ACPI_DISABLE:
printk(BIOS_DEBUG, "Disabling ACPI via APMC.\n");
break;
case APM_CNT_ACPI_ENABLE:
printk(BIOS_DEBUG, "Enabling ACPI via APMC.\n");
break;
case APM_CNT_GNVS_UPDATE:
set_smm_gnvs_ptr();
return 0;
case APM_CNT_FINALIZE:
printk(BIOS_DEBUG, "Finalizing SMM.\n");
break;
case APM_CNT_ELOG_GSMI:
break;
case APM_CNT_SMMSTORE:
break;
case APM_CNT_SMMINFO:
break;
default:
break;
}
/* Now raise the SMI. */
outb(cmd, APM_CNT);
printk(BIOS_DEBUG, "APMC done.\n");
return 0;
}
static void set_smm_gnvs_ptr(void)
{
uintptr_t gnvs_address;
if (CONFIG(ACPI_NO_SMI_GNVS)) {
printk(BIOS_WARNING, "%s() is not implemented\n", __func__);
return;
}
gnvs_address = (uintptr_t)acpi_get_gnvs();
if (!gnvs_address)
return;
/*
* Issue SMI to set the gnvs pointer in SMM.
*
* EAX = APM_CNT_GNVS_UPDATE
* EBX = gnvs pointer
* EDX = APM_CNT
*/
asm volatile (
"outb %%al, %%dx\n\t"
: /* ignore result */
: "a" (APM_CNT_GNVS_UPDATE),
"b" (gnvs_address),
"d" (APM_CNT)
);
}
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