60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* 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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* Based on include/sbi/{fw_dynamic.h,sbi_scratch.h} from the OpenSBI project.
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*/
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#ifndef RISCV_BOOT_OPENSBI_H
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#define RISCV_BOOT_OPENSBI_H
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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 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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enum sbi_scratch_options {
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/** Disable prints during boot */
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SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
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/** Enable runtime debug prints */
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SBI_SCRATCH_DEBUG_PRINTS = (1 << 1),
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};
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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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target_long magic;
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/** Info version */
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target_long version;
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/** Next booting stage address */
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target_long next_addr;
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/** Next booting stage mode */
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target_long next_mode;
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/** Options for OpenSBI library */
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target_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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target_long boot_hart;
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};
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#endif
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