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