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ACPI tables can be passed via EFI configuration table to an EFI application. This is only supported on x86 so far. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EFI application ACPI tables support
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*
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <efi_loader.h>
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#include <asm/acpi_table.h>
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static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID;
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/*
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* Install the ACPI 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_acpi_register(void)
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{
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/* Map within the low 32 bits, to allow for 32bit ACPI tables */
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u64 acpi = U32_MAX;
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efi_status_t ret;
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/* Reserve 64kiB page for ACPI */
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ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
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EFI_RUNTIME_SERVICES_DATA, 16, &acpi);
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if (ret != EFI_SUCCESS)
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return ret;
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/*
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* Generate ACPI 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_acpi_tables() will write the table at that address.
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*/
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assert(!(acpi & 0xf));
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write_acpi_tables(acpi);
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/* And expose them to our EFI payload */
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return efi_install_configuration_table(&acpi_guid,
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(void *)(uintptr_t)acpi);
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}
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