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| author | Vladimir Zapolskiy <vz@mleia.com> | 2016-11-28 00:15:34 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-12-02 21:32:53 -0500 |
| commit | 3500581ef3461c7cf5ca6fef7b45dd2dee0df28e (patch) | |
| tree | 4f830b74f45b000c2728688aec1bd151eaea1c7b /arch/sh/lib/start.S | |
| parent | 9c141b2bd72f9e51bd627580be7ffca93ba9b2d4 (diff) | |
| download | u-boot-3500581ef3461c7cf5ca6fef7b45dd2dee0df28e.tar.gz u-boot-3500581ef3461c7cf5ca6fef7b45dd2dee0df28e.tar.xz u-boot-3500581ef3461c7cf5ca6fef7b45dd2dee0df28e.zip | |
sh: share the correct version of start.S among all cpus
It is easy to note that SH2/SH3/SH4 start.S code is practically
the same with a minor difference for SH2 where a short data header is
present. To avoid unwanted code duplication and to automatically
convert SH2 and SH3 platforms to generic board support move fixed SH4
start.S into arch/sh/lib/start.S and share it among all platforms.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/sh/lib/start.S')
| -rw-r--r-- | arch/sh/lib/start.S | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/sh/lib/start.S b/arch/sh/lib/start.S new file mode 100644 index 0000000000..37d38d5fb8 --- /dev/null +++ b/arch/sh/lib/start.S @@ -0,0 +1,67 @@ +/* + * Copyright (C) 2016 Vladimir Zapolskiy <vz@mleia.com> + * Copyright (C) 2007, 2010 Nobuhiro Iwamatsu <iwamatsu@nigauri.org> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <asm-offsets.h> +#include <config.h> + + .text + .align 2 + + .global _start +_start: +#ifdef CONFIG_CPU_SH2 + .long 0x00000010 /* Ppower ON reset PC*/ + .long 0x00000000 + .long 0x00000010 /* Manual reset PC */ + .long 0x00000000 +#endif + mov.l ._lowlevel_init, r0 +100: bsrf r0 + nop + + bsr 1f + nop +1: sts pr, r5 + mov.l ._reloc_dst, r4 + add #(_start-1b), r5 + mov.l ._reloc_dst_end, r6 + +2: mov.l @r5+, r1 + mov.l r1, @r4 + add #4, r4 + cmp/hs r6, r4 + bf 2b + + mov.l ._bss_start, r4 + mov.l ._bss_end, r5 + mov #0, r1 + +3: mov.l r1, @r4 /* bss clear */ + add #4, r4 + cmp/hs r5, r4 + bf 3b + + mov.l ._gd_init, r13 /* global data */ + mov.l ._stack_init, r15 /* stack */ + + mov.l ._sh_generic_init, r0 + jsr @r0 + mov #0, r4 + +loop: + bra loop + + .align 2 + +._lowlevel_init: .long (lowlevel_init - (100b + 4)) +._reloc_dst: .long _start +._reloc_dst_end: .long reloc_dst_end +._bss_start: .long bss_start +._bss_end: .long bss_end +._gd_init: .long (_start - GENERATED_GBL_DATA_SIZE) +._stack_init: .long (_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16) +._sh_generic_init: .long board_init_f |