diff options
Diffstat (limited to 'arch/arc/lib/start.S')
| -rw-r--r-- | arch/arc/lib/start.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S new file mode 100644 index 0000000..e1ef19c --- /dev/null +++ b/arch/arc/lib/start.S @@ -0,0 +1,63 @@ +/* + * 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) |