soc/amd/stoneyridge: Add SMMSTORE support
Add SMMSTORE support for saving EFI NVRAM variables in conjunction with Tianocore payload. Test: build/boot several google/kahlee variants, test manipulation and persistence of Tianocore bootorder variables. Change-Id: Ida604a44d1fa5288e96dbe05de1f847e597cc95d Signed-off-by: Matt DeVillier <matt.devillier@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/38468 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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@ -23,6 +23,7 @@
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#include <arch/acpi.h>
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#include <arch/hlt.h>
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#include <device/pci_def.h>
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#include <smmstore.h>
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#include <soc/smi.h>
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#include <soc/southbridge.h>
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#include <amdblocks/acpimmio.h>
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@ -88,6 +89,25 @@ static void southbridge_smi_gsmi(void)
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io_smi->rax = gsmi_exec(sub_command, ®_ebx);
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}
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static void southbridge_smi_store(void)
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{
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u8 sub_command;
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amd64_smm_state_save_area_t *io_smi;
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u32 reg_ebx;
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io_smi = find_save_state(APM_CNT_SMMSTORE);
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if (!io_smi)
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return;
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/* Command and return value in EAX */
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sub_command = (io_smi->rax >> 8) & 0xff;
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/* Parameter buffer in EBX */
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reg_ebx = io_smi->rbx;
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/* drivers/smmstore/smi.c */
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io_smi->rax = smmstore_exec(sub_command, (void *)reg_ebx);
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}
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static void sb_apmc_smi_handler(void)
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{
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const uint8_t cmd = inb(pm_acpi_smi_cmd_port());
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@ -103,6 +123,10 @@ static void sb_apmc_smi_handler(void)
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if (CONFIG(ELOG_GSMI))
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southbridge_smi_gsmi();
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break;
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case APM_CNT_SMMSTORE:
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if (CONFIG(SMMSTORE))
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southbridge_smi_store();
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break;
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}
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mainboard_smi_apmc(cmd);
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