de6dd73b4e
When running U-Boot as an EFI payload with CONFIG_EFI_STUB, the reserved regions from the previous stage EFI bootloader should be carried over since they may not fully align with the reserved-memory regions in devicetree. Implement a helper to map these pages when the EFI subsystem starts up. Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Helpers for U-Boot running as an EFI payload.
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*
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* Copyright (c) 2024 Linaro, Ltd
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*/
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#ifndef _EFI_STUB_H
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#define _EFI_STUB_H
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#include <linux/types.h>
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enum efi_entry_t {
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EFIET_END, /* Signals this is the last (empty) entry */
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EFIET_MEMORY_MAP,
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EFIET_GOP_MODE,
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EFIET_SYS_TABLE,
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/* Number of entries */
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EFIET_MEMORY_COUNT,
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};
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/**
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* efi_info_get() - get an entry from an EFI table
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*
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* This function is called from U-Boot proper to read information set up by the
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* EFI stub. It can only be used when running from the EFI stub, not when U-Boot
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* is running as an app.
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*
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* @type: Entry type to search for
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* @datap: Returns pointer to entry data
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* @sizep: Returns entry size
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* Return: 0 if OK, -ENODATA if there is no table, -ENOENT if there is no entry
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* of the requested type, -EPROTONOSUPPORT if the table has the wrong version
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*/
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int efi_info_get(enum efi_entry_t type, void **datap, int *sizep);
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struct device_node;
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/**
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* of_populate_from_efi() - Populate the live tree from EFI tables
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*
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* @root: Root node of tree to populate
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*
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* This function populates the live tree with information from EFI tables
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* it is only applicable when running U-Boot as an EFI payload with
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* CONFIG_EFI_STUB enabled.
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*/
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int of_populate_from_efi(struct device_node *root);
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/**
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* dram_init_banksize_from_efi() - Initialize the memory banks from EFI tables
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*
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* This function initializes the memory banks from the EFI memory map table we
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* stashed from the EFI stub. It is only applicable when running U-Boot as an
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* EFI payload with CONFIG_EFI_STUB enabled.
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*/
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int dram_init_banksize_from_efi(void);
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/**
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* efi_add_known_memory_from_efi() - Add known memory pages from the memory map
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* of the EFI bootloader that booted U-Boot. This is only applicable when running
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* U-Boot as an EFI payload with CONFIG_EFI_STUB enabled.
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*/
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void efi_add_known_memory_from_efi(void);
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#endif /* _EFI_STUB_H */
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