| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <bootstate.h> |
| #include <console/console.h> |
| #include <cpu/x86/smm.h> |
| #include <cpu/intel/smm_reloc.h> |
| #include <intelblocks/pmclib.h> |
| #include <intelblocks/systemagent.h> |
| #include <soc/pm.h> |
| |
| void smm_southbridge_clear_state(void) |
| { |
| printk(BIOS_DEBUG, "Clearing SMI status registers\n"); |
| |
| if (pmc_get_smi_en() & APMC_EN) { |
| printk(BIOS_INFO, "SMI# handler already enabled?\n"); |
| return; |
| } |
| |
| /* Dump and clear status registers */ |
| pmc_clear_smi_status(); |
| pmc_clear_pm1_status(); |
| pmc_clear_tco_status(); |
| pmc_clear_all_gpe_status(); |
| } |
| |
| void smm_southbridge_enable(uint16_t pm1_events) |
| { |
| uint32_t smi_params = ENABLE_SMI_PARAMS; |
| |
| printk(BIOS_DEBUG, "Enabling SMIs.\n"); |
| /* Configure events */ |
| pmc_enable_pm1(pm1_events); |
| pmc_disable_std_gpe(PME_B0_EN); |
| |
| /* |
| * GPEs need to be disabled before enabling SMI. Otherwise, it could |
| * lead to SMIs being triggered in coreboot preventing the progress of |
| * normal boot-up. This is done as late as possible so that |
| * pmc_fill_power_state can read the correct state of GPE0_EN* registers |
| * and not lose information about the wake source. |
| */ |
| pmc_disable_all_gpe(); |
| |
| /* |
| * Enable SMI generation: |
| * - on APMC writes (io 0xb2) |
| * - on writes to SLP_EN (sleep states) |
| * - on writes to GBL_RLS (bios commands) |
| * - on eSPI events, unless disabled (does nothing on LPC systems) |
| * - on TCO events (TIMEOUT, case intrusion, ...), if enabled |
| * No SMIs: |
| * - on microcontroller writes (io 0x62/0x66) |
| */ |
| if (CONFIG(SOC_INTEL_COMMON_BLOCK_SMM_ESPI_DISABLE)) |
| smi_params &= ~ESPI_SMI_EN; |
| |
| if (CONFIG(SOC_INTEL_COMMON_BLOCK_SMM_TCO_ENABLE)) |
| smi_params |= TCO_SMI_EN; |
| |
| /* Enable SMI generation: */ |
| pmc_enable_smi(smi_params); |
| } |
| |
| void smm_setup_structures(void *gnvs, void *tcg, void *smi1) |
| { |
| /* |
| * Issue SMI to set the gnvs pointer in SMM. |
| * tcg and smi1 are unused. |
| * |
| * 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" ((u32)gnvs), |
| "d" (APM_CNT) |
| ); |
| } |