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https://github.com/riscv-software-src/opensbi
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bae54f7645
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>
119 lines
2.5 KiB
ArmAsm
119 lines
2.5 KiB
ArmAsm
/*
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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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#include <sbi/fw_dynamic.h>
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#include "fw_base.S"
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.align 3
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.section .entry, "ax", %progbits
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_bad_dynamic_info:
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wfi
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j _bad_dynamic_info
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.align 3
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.section .entry, "ax", %progbits
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.global fw_save_info
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/*
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* We can only use a0, a1, a2, a3, and a4 registers here.
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* The a0, a1, and a2 registers will be same as passed by
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* previous booting stage.
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* Nothing to be returned here.
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*/
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fw_save_info:
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la a4, _dynamic_next_arg1
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REG_S a1, (a4)
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li a4, FW_DYNAMIC_INFO_MAGIC_VALUE
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REG_L a3, FW_DYNAMIC_INFO_MAGIC_OFFSET(a2)
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bne a3, a4, _bad_dynamic_info
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li a4, FW_DYNAMIC_INFO_VERSION_MAX
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REG_L a3, FW_DYNAMIC_INFO_VERSION_OFFSET(a2)
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bgt a3, a4, _bad_dynamic_info
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la a4, _dynamic_next_addr
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REG_L a3, FW_DYNAMIC_INFO_NEXT_ADDR_OFFSET(a2)
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REG_S a3, (a4)
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la a4, _dynamic_next_mode
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REG_L a3, FW_DYNAMIC_INFO_NEXT_MODE_OFFSET(a2)
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REG_S a3, (a4)
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la a4, _dynamic_options
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REG_L a3, FW_DYNAMIC_INFO_OPTIONS_OFFSET(a2)
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REG_S a3, (a4)
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_prev_arg1
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/*
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* We can only use a0, a1, and a2 registers here.
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* The previous arg1 should be returned in 'a0'.
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*/
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fw_prev_arg1:
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add a0, zero, zero
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_arg1
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next arg1 should be returned in 'a0'.
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*/
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fw_next_arg1:
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la a0, _dynamic_next_arg1
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REG_L a0, (a0)
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_addr
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next address should be returned in 'a0'.
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*/
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fw_next_addr:
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la a0, _dynamic_next_addr
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REG_L a0, (a0)
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_next_mode
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/*
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* We can only use a0, a1, and a2 registers here.
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* The next address should be returned in 'a0'
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*/
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fw_next_mode:
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la a0, _dynamic_next_mode
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REG_L a0, (a0)
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ret
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.align 3
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.section .entry, "ax", %progbits
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.global fw_options
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/*
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* We can only use a0, a1, and a2 registers here.
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* The 'a4' register will have default options.
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* The next address should be returned in 'a0'.
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*/
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fw_options:
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la a0, _dynamic_options
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REG_L a0, (a0)
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ret
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.align 3
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.section .entry, "ax", %progbits
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_dynamic_next_arg1:
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RISCV_PTR 0x0
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_dynamic_next_addr:
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RISCV_PTR 0x0
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_dynamic_next_mode:
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RISCV_PTR PRV_S
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_dynamic_options:
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RISCV_PTR 0x0
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