/*
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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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.section .entry, "ax", %progbits
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.align 3
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_bad_dynamic_info:
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wfi
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j _bad_dynamic_info
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.section .entry, "ax", %progbits
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.align 3
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.global fw_boot_hart
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/*
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* This function is called very early even before
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* fw_save_info() is called.
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* We can only use a0, a1, and a2 registers here.
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* The boot HART id should be returned in 'a0'.
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*/
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fw_boot_hart:
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/* Sanity checks */
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li a1, FW_DYNAMIC_INFO_MAGIC_VALUE
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REG_L a0, FW_DYNAMIC_INFO_MAGIC_OFFSET(a2)
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bne a0, a1, _bad_dynamic_info
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li a1, FW_DYNAMIC_INFO_VERSION_MAX
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REG_L a0, FW_DYNAMIC_INFO_VERSION_OFFSET(a2)
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bgt a0, a1, _bad_dynamic_info
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/* Read boot HART id */
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li a1, 0x2
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blt a0, a1, 2f
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REG_L a0, FW_DYNAMIC_INFO_BOOT_HART_OFFSET(a2)
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ret
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2: li a0, -1
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ret
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.section .entry, "ax", %progbits
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.align 3
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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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/* Save next arg1 in 'a1' */
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la a4, _dynamic_next_arg1
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REG_S a1, (a4)
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/* Sanity checks */
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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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/* Save version == 0x1 fields */
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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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/* Save version == 0x2 fields */
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li a4, 0x2
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REG_L a3, FW_DYNAMIC_INFO_VERSION_OFFSET(a2)
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blt a3, a4, 2f
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la a4, _dynamic_boot_hart
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REG_L a3, FW_DYNAMIC_INFO_BOOT_HART_OFFSET(a2)
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REG_S a3, (a4)
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2:
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ret
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.section .entry, "ax", %progbits
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.align 3
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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 a0, a1, and a2 registers will be same as passed by
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* previous booting stage.
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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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.section .entry, "ax", %progbits
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.align 3
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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 a0, a1, and a2 registers will be same as passed by
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* previous booting stage.
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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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.section .entry, "ax", %progbits
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.align 3
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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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.section .entry, "ax", %progbits
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.align 3
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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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.section .entry, "ax", %progbits
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.align 3
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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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.section .entry, "ax", %progbits
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.align 3
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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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_dynamic_boot_hart:
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RISCV_PTR -1
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