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u-boot/arch/sh/lib/start.S

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SPDX: Convert all of our single license tags to Linux Kernel style When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-06 21:58:06 +00:00
/* SPDX-License-Identifier: GPL-2.0+ */
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
/*
sh4: fix start.S by calling board_init_f() after first code relocation Like on ARM platform keep the first code relocation from a U-boot image storage to RAM at CONFIG_SYS_TEXT_BASE, then pass execution to a generic board_init_f() with empty GD flags. If CONFIG_SYS_TEXT_BASE is equal to a calculated by board_init_f() relocation address there will be no more code and data copy, however it's worth to mention that the first copy happens even if $pc on _start is the same as CONFIG_SYS_TEXT_BASE, on practice this works without a problem. Also note that _sh_start is renamed back to _start to correct gd->mon_len calculation by setup_mon_len(), the opposite rename was done in pre-generic board commit 2024b968ee9 ("sh: Fix build in start.S"). Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-27 22:15:33 +00:00
* Copyright (C) 2016 Vladimir Zapolskiy <vz@mleia.com>
* Copyright (C) 2007, 2010 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
*/
Replace CONFIG_SYS_GBL_DATA_SIZE by auto-generated value CONFIG_SYS_GBL_DATA_SIZE has always been just a bad workarond for not being able to use "sizeof(struct global_data)" in assembler files. Recent experience has shown that manual synchronization is not reliable enough. This patch renames CONFIG_SYS_GBL_DATA_SIZE into GENERATED_GBL_DATA_SIZE which gets automatically generated by the asm-offsets tool. In the result, all definitions of this value can be deleted from the board config files. We have to make sure that all files that reference such data include the new <asm-offsets.h> file. No other changes have been done yet, but it is obvious that similar changes / simplifications can be done for other, related macro definitions as well. Signed-off-by: Wolfgang Denk <wd@denx.de> Acked-by: Kumar Gala <galak@kernel.crashing.org>
2010-10-26 12:34:52 +00:00
#include <asm-offsets.h>
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
#include <config.h>
.text
.align 2
.global _start
sh4: fix start.S by calling board_init_f() after first code relocation Like on ARM platform keep the first code relocation from a U-boot image storage to RAM at CONFIG_SYS_TEXT_BASE, then pass execution to a generic board_init_f() with empty GD flags. If CONFIG_SYS_TEXT_BASE is equal to a calculated by board_init_f() relocation address there will be no more code and data copy, however it's worth to mention that the first copy happens even if $pc on _start is the same as CONFIG_SYS_TEXT_BASE, on practice this works without a problem. Also note that _sh_start is renamed back to _start to correct gd->mon_len calculation by setup_mon_len(), the opposite rename was done in pre-generic board commit 2024b968ee9 ("sh: Fix build in start.S"). Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-27 22:15:33 +00:00
_start:
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
mov.l ._lowlevel_init, r0
100: bsrf r0
nop
bsr 1f
nop
1: sts pr, r5
Fix coding style issues; update CHANGELOG. Signed-off-by: Wolfgang Denk <wd@denx.de>
2007-12-27 00:52:50 +00:00
mov.l ._reloc_dst, r4
sh4: fix start.S by calling board_init_f() after first code relocation Like on ARM platform keep the first code relocation from a U-boot image storage to RAM at CONFIG_SYS_TEXT_BASE, then pass execution to a generic board_init_f() with empty GD flags. If CONFIG_SYS_TEXT_BASE is equal to a calculated by board_init_f() relocation address there will be no more code and data copy, however it's worth to mention that the first copy happens even if $pc on _start is the same as CONFIG_SYS_TEXT_BASE, on practice this works without a problem. Also note that _sh_start is renamed back to _start to correct gd->mon_len calculation by setup_mon_len(), the opposite rename was done in pre-generic board commit 2024b968ee9 ("sh: Fix build in start.S"). Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-27 22:15:33 +00:00
add #(_start-1b), r5
Fix coding style issues; update CHANGELOG. Signed-off-by: Wolfgang Denk <wd@denx.de>
2007-12-27 00:52:50 +00:00
mov.l ._reloc_dst_end, r6
sh: Fix OF_SEPARATE support If the OF_SEPARATE is enabled, the DT is appended past the _end symbol. The current code however clears BSS very early, which overwrites the DT blob with zeroes. Moreover, the early code relocates U-Boot into RAM to the correct location, but does not relocate the DT. This patch adds code to relocate the DT and avoids clearing BSS too early, thus addressing both problems with OF_SEPARATE on SH. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2019-09-01 16:05:03 +00:00
#ifdef CONFIG_OF_SEPARATE
mov.l ._reloc_size, r0
add r5, r0
add #4, r0
mov.l @r0, r0
swap.b r0, r0
swap.w r0, r0
swap.b r0, r0
add #4, r0
add r0, r6
#endif
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
2: mov.l @r5+, r1
mov.l r1, @r4
add #4, r4
cmp/hs r6, r4
bf 2b
Fix coding style issues; update CHANGELOG. Signed-off-by: Wolfgang Denk <wd@denx.de>
2007-12-27 00:52:50 +00:00
sh: Fix OF_SEPARATE support If the OF_SEPARATE is enabled, the DT is appended past the _end symbol. The current code however clears BSS very early, which overwrites the DT blob with zeroes. Moreover, the early code relocates U-Boot into RAM to the correct location, but does not relocate the DT. This patch adds code to relocate the DT and avoids clearing BSS too early, thus addressing both problems with OF_SEPARATE on SH. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2019-09-01 16:05:03 +00:00
#ifndef CONFIG_OF_SEPARATE
Fix coding style issues; update CHANGELOG. Signed-off-by: Wolfgang Denk <wd@denx.de>
2007-12-27 00:52:50 +00:00
mov.l ._bss_start, r4
mov.l ._bss_end, r5
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
mov #0, r1
Fix coding style issues; update CHANGELOG. Signed-off-by: Wolfgang Denk <wd@denx.de>
2007-12-27 00:52:50 +00:00
3: mov.l r1, @r4 /* bss clear */
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
add #4, r4
cmp/hs r5, r4
bf 3b
sh: Fix OF_SEPARATE support If the OF_SEPARATE is enabled, the DT is appended past the _end symbol. The current code however clears BSS very early, which overwrites the DT blob with zeroes. Moreover, the early code relocates U-Boot into RAM to the correct location, but does not relocate the DT. This patch adds code to relocate the DT and avoids clearing BSS too early, thus addressing both problems with OF_SEPARATE on SH. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2019-09-01 16:05:03 +00:00
#endif
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
mov.l ._gd_init, r13 /* global data */
mov.l ._stack_init, r15 /* stack */
sh4: fix start.S by calling board_init_f() after first code relocation Like on ARM platform keep the first code relocation from a U-boot image storage to RAM at CONFIG_SYS_TEXT_BASE, then pass execution to a generic board_init_f() with empty GD flags. If CONFIG_SYS_TEXT_BASE is equal to a calculated by board_init_f() relocation address there will be no more code and data copy, however it's worth to mention that the first copy happens even if $pc on _start is the same as CONFIG_SYS_TEXT_BASE, on practice this works without a problem. Also note that _sh_start is renamed back to _start to correct gd->mon_len calculation by setup_mon_len(), the opposite rename was done in pre-generic board commit 2024b968ee9 ("sh: Fix build in start.S"). Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-27 22:15:33 +00:00
mov.l ._sh_generic_init, r0
jsr @r0
mov #0, r4
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
loop:
bra loop
.align 2
._lowlevel_init: .long (lowlevel_init - (100b + 4))
sh4: fix start.S by calling board_init_f() after first code relocation Like on ARM platform keep the first code relocation from a U-boot image storage to RAM at CONFIG_SYS_TEXT_BASE, then pass execution to a generic board_init_f() with empty GD flags. If CONFIG_SYS_TEXT_BASE is equal to a calculated by board_init_f() relocation address there will be no more code and data copy, however it's worth to mention that the first copy happens even if $pc on _start is the same as CONFIG_SYS_TEXT_BASE, on practice this works without a problem. Also note that _sh_start is renamed back to _start to correct gd->mon_len calculation by setup_mon_len(), the opposite rename was done in pre-generic board commit 2024b968ee9 ("sh: Fix build in start.S"). Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-27 22:15:33 +00:00
._reloc_dst: .long _start
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
._reloc_dst_end: .long reloc_dst_end
sh: Fix OF_SEPARATE support If the OF_SEPARATE is enabled, the DT is appended past the _end symbol. The current code however clears BSS very early, which overwrites the DT blob with zeroes. Moreover, the early code relocates U-Boot into RAM to the correct location, but does not relocate the DT. This patch adds code to relocate the DT and avoids clearing BSS too early, thus addressing both problems with OF_SEPARATE on SH. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2019-09-01 16:05:03 +00:00
._reloc_size: .long (_end - _start)
sh: First support code of SuperH. Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
2007-05-13 11:58:00 +00:00
._bss_start: .long bss_start
._bss_end: .long bss_end
sh4: fix start.S by calling board_init_f() after first code relocation Like on ARM platform keep the first code relocation from a U-boot image storage to RAM at CONFIG_SYS_TEXT_BASE, then pass execution to a generic board_init_f() with empty GD flags. If CONFIG_SYS_TEXT_BASE is equal to a calculated by board_init_f() relocation address there will be no more code and data copy, however it's worth to mention that the first copy happens even if $pc on _start is the same as CONFIG_SYS_TEXT_BASE, on practice this works without a problem. Also note that _sh_start is renamed back to _start to correct gd->mon_len calculation by setup_mon_len(), the opposite rename was done in pre-generic board commit 2024b968ee9 ("sh: Fix build in start.S"). Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-11-27 22:15:33 +00:00
._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
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