d9d2b8fb71
Introduce two new helpers dram_init_banksize_from_efi() and of_populate_from_efi(). These populate the DRAM bank info and simplefb framebuffer OF node respectively using the EFI table populated by the EFI stub. dram_init_banksize_from_efi() is directly moved from the x86 payload code to make it available for other boards. Populating the simplefb node allows for an easy way to bring up video without the full heft of VIDEO_EFI which is not particularly well-suited to ARM. Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> Avoid changing the devicetree with the EFI app; fix build error on x86: Signed-off-by: Simon Glass <sjg@chromium.org>
61 lines
1.6 KiB
C
61 lines
1.6 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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#endif /* _EFI_STUB_H */
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