| /* 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; |
| } |