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-rw-r--r--arch/arc/lib/start.S63
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S
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+++ b/arch/arc/lib/start.S
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+/*
+ * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+#include <asm/arcregs.h>
+
+ENTRY(_start)
+ /* Setup interrupt vector base that matches "__text_start" */
+ sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
+
+ /* Setup stack- and frame-pointers */
+ mov %sp, CONFIG_SYS_INIT_SP_ADDR
+ mov %fp, %sp
+
+ /* Unconditionally disable caches */
+#ifdef CONFIG_ISA_ARCV2
+ bl slc_flush
+ bl slc_disable
+#endif
+ bl flush_dcache_all
+ bl dcache_disable
+ bl icache_disable
+
+ /* Allocate and zero GD, update SP */
+ mov %r0, %sp
+ bl board_init_f_mem
+
+ /* Update stack- and frame-pointers */
+ mov %sp, %r0
+ mov %fp, %sp
+
+ /* Zero the one and only argument of "board_init_f" */
+ mov_s %r0, 0
+ j board_init_f
+ENDPROC(_start)
+
+/*
+ * void board_init_f_r_trampoline(stack-pointer address)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ * r0 = new stack-pointer
+ */
+ENTRY(board_init_f_r_trampoline)
+ /* Set up the stack- and frame-pointers */
+ mov %sp, %r0
+ mov %fp, %sp
+
+ /* Update position of intterupt vector table */
+ lr %r0, [ARC_AUX_INTR_VEC_BASE]
+ ld %r1, [%r25, GD_RELOC_OFF]
+ add %r0, %r0, %r1
+ sr %r0, [ARC_AUX_INTR_VEC_BASE]
+
+ /* Re-enter U-Boot by calling board_init_f_r */
+ j board_init_f_r
+ENDPROC(board_init_f_r_trampoline)