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https://github.com/smaeul/u-boot.git
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16c220d0a7
The EFI stub can pass a table to U-Boot with information about the memory map Potentially other things will follow. Add a way to access this table. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
48 lines
905 B
C
48 lines
905 B
C
/*
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* Copyright (c) 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* Access to the EFI information table
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*/
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#include <common.h>
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#include <efi.h>
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#include <errno.h>
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#include <mapmem.h>
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int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
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{
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struct efi_entry_hdr *entry;
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struct efi_info_hdr *info;
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int ret;
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if (!gd->arch.table)
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return -ENODATA;
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info = map_sysmem(gd->arch.table, 0);
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if (info->version != EFI_TABLE_VERSION) {
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ret = -EPROTONOSUPPORT;
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goto err;
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}
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entry = (struct efi_entry_hdr *)((ulong)info + info->hdr_size);
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while (entry->type != EFIET_END) {
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if (entry->type == type) {
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if (entry->addr)
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*datap = map_sysmem(entry->addr, entry->size);
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else
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*datap = entry + 1;
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*sizep = entry->size;
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return 0;
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}
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entry = (struct efi_entry_hdr *)((ulong)entry + entry->link);
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}
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ret = -ENOENT;
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err:
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unmap_sysmem(info);
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return ret;
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}
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