80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef __FW_DYNAMIC_H__
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#define __FW_DYNAMIC_H__
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#include <sbi/riscv_asm.h>
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/* clang-format off */
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/** Offset of magic member in fw_dynamic_info */
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#define FW_DYNAMIC_INFO_MAGIC_OFFSET (0 * __SIZEOF_POINTER__)
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/** Offset of version member in fw_dynamic_info */
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#define FW_DYNAMIC_INFO_VERSION_OFFSET (1 * __SIZEOF_POINTER__)
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/** Offset of next_addr member in fw_dynamic_info (version >= 1) */
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#define FW_DYNAMIC_INFO_NEXT_ADDR_OFFSET (2 * __SIZEOF_POINTER__)
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/** Offset of next_mode member in fw_dynamic_info (version >= 1) */
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#define FW_DYNAMIC_INFO_NEXT_MODE_OFFSET (3 * __SIZEOF_POINTER__)
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/** Offset of options member in fw_dynamic_info (version >= 1) */
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#define FW_DYNAMIC_INFO_OPTIONS_OFFSET (4 * __SIZEOF_POINTER__)
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/** Offset of boot_hart member in fw_dynamic_info (version >= 2) */
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#define FW_DYNAMIC_INFO_BOOT_HART_OFFSET (5 * __SIZEOF_POINTER__)
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/** Expected value of info magic ('OSBI' ascii string in hex) */
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#define FW_DYNAMIC_INFO_MAGIC_VALUE 0x4942534f
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/** Maximum supported info version */
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#define FW_DYNAMIC_INFO_VERSION_MAX 0x2
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/** Possible next mode values */
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#define FW_DYNAMIC_INFO_NEXT_MODE_U 0x0
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#define FW_DYNAMIC_INFO_NEXT_MODE_S 0x1
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#define FW_DYNAMIC_INFO_NEXT_MODE_M 0x3
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/* clang-format on */
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#ifndef __ASSEMBLY__
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#include <sbi/sbi_types.h>
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/** Representation dynamic info passed by previous booting stage */
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struct fw_dynamic_info {
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/** Info magic */
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unsigned long magic;
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/** Info version */
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unsigned long version;
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/** Next booting stage address */
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unsigned long next_addr;
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/** Next booting stage mode */
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unsigned long next_mode;
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/** Options for OpenSBI library */
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unsigned long options;
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/**
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* Preferred boot HART id
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*
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* It is possible that the previous booting stage uses same link
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* address as the FW_DYNAMIC firmware. In this case, the relocation
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* lottery mechanism can potentially overwrite the previous booting
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* stage while other HARTs are still running in the previous booting
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* stage leading to boot-time crash. To avoid this boot-time crash,
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* the previous booting stage can specify last HART that will jump
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* to the FW_DYNAMIC firmware as the preferred boot HART.
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*
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* To avoid specifying a preferred boot HART, the previous booting
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* stage can set it to -1UL which will force the FW_DYNAMIC firmware
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* to use the relocation lottery mechanism.
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*/
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unsigned long boot_hart;
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} __packed;
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#endif
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#endif
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