/* SPDX-License-Identifier: GPL-2.0-only */ #include <arch/io.h> #include <console/console.h> #include <cpu/x86/smm.h> #include <stdint.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; }