mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-25 04:19:43 +09:00
3fb8016360
Intention behind this work was elimination of as much assembly-written code as it is possible. In case of ARC we already have relocation fix-up implemented in C so why don't we use C for U-Boot copying, .bss zeroing etc. It turned out x86 uses pretty similar approach so we re-used parts of code in "board_f.c" initially implemented for x86. Now assembly usage during init is limited to stack- and frame-pointer setup before and after relocation. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Simon Glass <sjg@chromium.org>
52 lines
1.2 KiB
ArmAsm
52 lines
1.2 KiB
ArmAsm
/*
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* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <linux/linkage.h>
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#include <asm/arcregs.h>
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ENTRY(_start)
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/* Setup interrupt vector base that matches "__text_start" */
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sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
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/* Setup stack- and frame-pointers */
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mov %sp, CONFIG_SYS_INIT_SP_ADDR
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mov %fp, %sp
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/* Unconditionally disable caches */
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bl flush_dcache_all
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bl dcache_disable
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bl icache_disable
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/* Zero the one and only argument of "board_init_f" */
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mov_s %r0, 0
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j board_init_f
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ENDPROC(_start)
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/*
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* void board_init_f_r_trampoline(stack-pointer address)
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*
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* This "function" does not return, instead it continues in RAM
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* after relocating the monitor code.
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*
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* r0 = new stack-pointer
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*/
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ENTRY(board_init_f_r_trampoline)
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/* Set up the stack- and frame-pointers */
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mov %sp, %r0
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mov %fp, %sp
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/* Update position of intterupt vector table */
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lr %r0, [ARC_AUX_INTR_VEC_BASE]
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ld %r1, [%r25, GD_RELOC_OFF]
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add %r0, %r0, %r1
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sr %r0, [ARC_AUX_INTR_VEC_BASE]
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/* Re-enter U-Boot by calling board_init_f_r */
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j board_init_f_r
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ENDPROC(board_init_f_r_trampoline)
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