src/cpu/x86/smi_trigger.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include <console/console.h>
   5 #include <cpu/x86/smm.h>
   6 #include <smm_call.h>
   7 #include <stdint.h>
   8
   9 static void apmc_log(const char *fn, u8 cmd)
  10 {
  11         switch (cmd) {
  12         case APM_CNT_ACPI_DISABLE:
  13                 printk(BIOS_DEBUG, "%s: Disabling ACPI.\n", fn);
  14                 break;
  15         case APM_CNT_ACPI_ENABLE:
  16                 printk(BIOS_DEBUG, "%s: Enabling ACPI.\n", fn);
  17                 break;
  18         case APM_CNT_FINALIZE:
  19                 printk(BIOS_DEBUG, "%s: Finalizing SMM.\n", fn);
  20                 break;
  21         case APM_CNT_ELOG_GSMI:
  22                 break;
  23         case APM_CNT_SMMSTORE:
  24                 break;
  25         case APM_CNT_SMMINFO:
  26                 break;
  27         default:
  28                 printk(BIOS_DEBUG, "%s: Unknown APMC 0x%02x.\n", fn, cmd);
  29                 break;
  30         }
  31 }
  32
  33 enum cb_err apm_control(u8 cmd)
  34 {
  35         /* Never proceed inside SMI handler or without one. */
  36         if (ENV_SMM || !CONFIG(HAVE_SMI_HANDLER))
  37                 return CB_ERR;
  38
  39         apmc_log(__func__, cmd);
  40
  41         /* Now raise the SMI. */
  42         call_smm(cmd, 0, NULL);
  43
  44         printk(BIOS_DEBUG, "APMC done.\n");
  45         return CB_SUCCESS;
  46 }
  47
  48 u8 apm_get_apmc(void)
  49 {
  50         /* Read command byte from APMC SMI IO port */
  51         u8 cmd = inb(pm_acpi_smi_cmd_port());
  52
  53         apmc_log("SMI#", cmd);
  54         return cmd;
  55 }