opensbi.h
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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Based on include/sbi/{fw_dynamic.h,sbi_scratch.h} from the OpenSBI project.
*/
#ifndef OPENSBI_H
#define OPENSBI_H
/** Expected value of info magic ('OSBI' ascii string in hex) */
#define FW_DYNAMIC_INFO_MAGIC_VALUE 0x4942534f
/** Maximum supported info version */
#define FW_DYNAMIC_INFO_VERSION 0x2
/** Possible next mode values */
#define FW_DYNAMIC_INFO_NEXT_MODE_U 0x0
#define FW_DYNAMIC_INFO_NEXT_MODE_S 0x1
#define FW_DYNAMIC_INFO_NEXT_MODE_M 0x3
enum sbi_scratch_options {
/** Disable prints during boot */
SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
};
/** Representation dynamic info passed by previous booting stage */
struct fw_dynamic_info {
/** Info magic */
unsigned long magic;
/** Info version */
unsigned long version;
/** Next booting stage address */
unsigned long next_addr;
/** Next booting stage mode */
unsigned long next_mode;
/** Options for OpenSBI library */
unsigned long options;
/**
* Preferred boot HART id
*
* It is possible that the previous booting stage uses same link
* address as the FW_DYNAMIC firmware. In this case, the relocation
* lottery mechanism can potentially overwrite the previous booting
* stage while other HARTs are still running in the previous booting
* stage leading to boot-time crash. To avoid this boot-time crash,
* the previous booting stage can specify last HART that will jump
* to the FW_DYNAMIC firmware as the preferred boot HART.
*
* To avoid specifying a preferred boot HART, the previous booting
* stage can set it to -1UL which will force the FW_DYNAMIC firmware
* to use the relocation lottery mechanism.
*/
unsigned long boot_hart;
} __packed;
#endif