fc274ee3d0
This function is useful in the app so move it to the common helper. Signed-off-by: Simon Glass <sjg@chromium.org>
89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2020, Linaro Limited
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*/
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#define LOG_CATEGORY LOGC_EFI
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#include <efi.h>
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#include <efi_device_path.h>
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#include <string.h>
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#include <linux/types.h>
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static int u16_tohex(u16 c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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/* not hexadecimal */
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return -1;
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}
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bool efi_varname_is_load_option(u16 *var_name16, int *index)
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{
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int id, i, digit;
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if (memcmp(var_name16, u"Boot", 8))
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return false;
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for (id = 0, i = 0; i < 4; i++) {
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digit = u16_tohex(var_name16[4 + i]);
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if (digit < 0)
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break;
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id = (id << 4) + digit;
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}
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if (i == 4 && !var_name16[8]) {
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if (index)
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*index = id;
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return true;
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}
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return false;
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}
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/**
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* efi_load_option_dp_join() - join device-paths for load option
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*
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* @dp: in: binary device-path, out: joined device-path
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* @dp_size: size of joined device-path
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* @initrd_dp: initrd device-path or NULL
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* @fdt_dp: device-tree device-path or NULL
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* Return: status_code
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*/
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efi_status_t efi_load_option_dp_join(struct efi_device_path **dp,
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size_t *dp_size,
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struct efi_device_path *initrd_dp,
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struct efi_device_path *fdt_dp)
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{
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if (!dp)
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return EFI_INVALID_PARAMETER;
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*dp_size = efi_dp_size(*dp);
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if (initrd_dp) {
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struct efi_device_path *tmp_dp = *dp;
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*dp = efi_dp_concat(tmp_dp, initrd_dp, *dp_size);
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efi_free_pool(tmp_dp);
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if (!*dp)
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return EFI_OUT_OF_RESOURCES;
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*dp_size += efi_dp_size(initrd_dp) + sizeof(EFI_DP_END);
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}
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if (fdt_dp) {
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struct efi_device_path *tmp_dp = *dp;
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*dp = efi_dp_concat(tmp_dp, fdt_dp, *dp_size);
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efi_free_pool(tmp_dp);
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if (!*dp)
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return EFI_OUT_OF_RESOURCES;
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*dp_size += efi_dp_size(fdt_dp) + sizeof(EFI_DP_END);
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}
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*dp_size += sizeof(EFI_DP_END);
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return EFI_SUCCESS;
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}
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