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// SPDX-License-Identifier: GPL-2.0+
/*
* Bootmethod for distro boot via EFI
*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#include <efi_loader.h>
#include <env.h>
#include <errno.h>
#include <log.h>
#include <string.h>
#include <vsprintf.h>
/**
* distro_efi_get_fdt_name() - get the filename for reading the .dtb file
*
* @fname: buffer for filename
* @size: buffer size
* @seq: sequence number, to cycle through options (0=first)
*
* Returns:
* 0 on success,
* -ENOENT if the "fdtfile" env var does not exist,
* -EINVAL if there are no more options,
* -EALREADY if the control FDT should be used
*/
int efi_get_distro_fdt_name(char *fname, int size, int seq)
{
const char *fdt_fname;
const char *prefix;
/* select the prefix */
switch (seq) {
case 0:
/* this is the default */
prefix = "/dtb";
break;
case 1:
prefix = "";
break;
case 2:
prefix = "/dtb/current";
break;
default:
return log_msg_ret("pref", -EINVAL);
}
fdt_fname = env_get("fdtfile");
if (fdt_fname) {
snprintf(fname, size, "%s/%s", prefix, fdt_fname);
log_debug("Using device tree: %s\n", fname);
} else if (IS_ENABLED(CONFIG_OF_HAS_PRIOR_STAGE)) {
strcpy(fname, "<prior>");
return log_msg_ret("pref", -EALREADY);
/* Use this fallback only for 32-bit ARM */
} else if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_ARM64)) {
const char *soc = env_get("soc");
const char *board = env_get("board");
const char *boardver = env_get("boardver");
/* cf the code in label_boot() which seems very complex */
snprintf(fname, size, "%s/%s%s%s%s.dtb", prefix,
soc ? soc : "", soc ? "-" : "", board ? board : "",
boardver ? boardver : "");
log_debug("Using default device tree: %s\n", fname);
} else {
return log_msg_ret("env", -ENOENT);
}
return 0;
}
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