forked from Mirrors/opensbi
25472de89e
This patch extends existing firmwares (i.e. fw_jump and fw_payload) to explicitly provide next mode and options to fw_base. We also introduce fw_save_info() which is called by fw_base very early on boot HART. This function can be used by existing firmwares (i.e. fw_jump and fw_payload) to save information passed by previous booting stage. Overall, this is a preparatory patch for implementing fw_dynamic. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
93 lines
1.8 KiB
ArmAsm
93 lines
1.8 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 "fw_base.S"
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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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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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#ifdef FW_JUMP_FDT_ADDR
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li a0, FW_JUMP_FDT_ADDR
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#else
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add a0, zero, zero
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#endif
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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, _jump_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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li a0, PRV_S
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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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add a0, zero, zero
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ret
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#ifndef FW_JUMP_ADDR
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#error "Must define FW_JUMP_ADDR"
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#endif
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.align 3
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.section .entry, "ax", %progbits
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_jump_addr:
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RISCV_PTR FW_JUMP_ADDR
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