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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * EFI application tables support
- *
- * Copyright (c) 2016 Alexander Graf
- */
- #include <common.h>
- #include <efi_loader.h>
- #include <log.h>
- #include <mapmem.h>
- #include <smbios.h>
- static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
- /*
- * Install the SMBIOS table as a configuration table.
- *
- * @return status code
- */
- efi_status_t efi_smbios_register(void)
- {
- /* Map within the low 32 bits, to allow for 32bit SMBIOS tables */
- u64 dmi_addr = U32_MAX;
- efi_status_t ret;
- void *dmi;
- /* Reserve 4kiB page for SMBIOS */
- ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
- EFI_RUNTIME_SERVICES_DATA, 1, &dmi_addr);
- if (ret != EFI_SUCCESS) {
- /* Could not find space in lowmem, use highmem instead */
- ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
- EFI_RUNTIME_SERVICES_DATA, 1,
- &dmi_addr);
- if (ret != EFI_SUCCESS)
- return ret;
- }
- /*
- * Generate SMBIOS tables - we know that efi_allocate_pages() returns
- * a 4k-aligned address, so it is safe to assume that
- * write_smbios_table() will write the table at that address.
- *
- * Note that on sandbox, efi_allocate_pages() unfortunately returns a
- * pointer even though it uses a uint64_t type. Convert it.
- */
- assert(!(dmi_addr & 0xf));
- dmi = (void *)(uintptr_t)dmi_addr;
- write_smbios_table(map_to_sysmem(dmi));
- /* And expose them to our EFI payload */
- return efi_install_configuration_table(&smbios_guid, dmi);
- }
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