efi_smbios.c
1.4 KB
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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 <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);
}