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firmware: Add fw_dynamic firmware

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This patch provides first-cut implementation of fw_dynamic firmware.

As compared to fw_jump and fw_payload, the fw_dynamic obtains next
address, next mode and OpenSBI options from struct fw_dynamic_info.

The previous booting stage can create struct fw_dynamic_info in memory
and pass address of struct fw_dynamic_info in 'a2' register. Also, the
struct fw_dynamic_info has versioning as well so changes to the struct
fw_dynamic_info can be done in a backward compatible manner.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel 2019-04-29 11:55:19 +05:30 • committed by Anup Patel
parent 25472de89e
commit bae54f7645
4 changed files with 197 additions and 0 deletions
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61
include/sbi/fw_dynamic.h Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#ifndef __FW_DYNAMIC_H__
#define __FW_DYNAMIC_H__
#include <sbi/riscv_asm.h>
/* clang-format off */
/** Offset of magic member in fw_dynamic_info */
#define FW_DYNAMIC_INFO_MAGIC_OFFSET (0 * __SIZEOF_POINTER__)
/** Offset of version member in fw_dynamic_info */
#define FW_DYNAMIC_INFO_VERSION_OFFSET (1 * __SIZEOF_POINTER__)
/** Offset of next_addr member in fw_dynamic_info */
#define FW_DYNAMIC_INFO_NEXT_ADDR_OFFSET (2 * __SIZEOF_POINTER__)
/** Offset of next_mode member in fw_dynamic_info */
#define FW_DYNAMIC_INFO_NEXT_MODE_OFFSET (3 * __SIZEOF_POINTER__)
/** Offset of options member in fw_dynamic_info */
#define FW_DYNAMIC_INFO_OPTIONS_OFFSET (4 * __SIZEOF_POINTER__)
/** 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_MAX 0x1
/** 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
/* clang-format on */
#ifndef __ASSEMBLY__
#include <sbi/sbi_types.h>
/** 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;
} __packed;
#endif
#endif