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From: Oleksij Rempel <o.rempel@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Subject: [PATCH v2 04/10] MIPS: start: preserve DTB pointer for later use
Date: Tue, 27 Nov 2018 08:37:08 +0100	[thread overview]
Message-ID: <20181127073714.16472-5-o.rempel@pengutronix.de> (raw)
In-Reply-To: <20181127073714.16472-1-o.rempel@pengutronix.de>

We will get DTB pointer in a0 register. Since a0 is used as argument by
other functions, we need to preserve it and then pass as argument to the
main_entry().

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 arch/mips/boot/start.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/mips/boot/start.S b/arch/mips/boot/start.S
index e937e89af1..39ac9414d8 100644
--- a/arch/mips/boot/start.S
+++ b/arch/mips/boot/start.S
@@ -27,6 +27,10 @@ EXPORT(_start)
 
 	mips_barebox_10h
 
+	/* save dtb pointer */
+	move	s0, a0
+	move	s1, a1
+
 	/* disable watchpoints */
 	mtc0	zero, CP0_WATCHLO
 	mtc0	zero, CP0_WATCHHI
@@ -37,6 +41,9 @@ EXPORT(_start)
 
 	stack_setup
 
+	/* restore dtb pointer */
+	move	a0, s0
+	move	a1, s1
 	la	v0, main_entry
 	jal	v0
 	 nop
-- 
2.19.1


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  parent reply	other threads:[~2018-11-27  7:37 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-27  7:37 [PATCH v2 00/10] MIPS: migrate to multiimage support Oleksij Rempel
2018-11-27  7:37 ` [PATCH v2 01/10] images: piggy: use "a" instead of #alloc flag Oleksij Rempel
2018-11-27  7:37 ` [PATCH v2 02/10] MIPS: add arch/mips/lib/pbl.lds.S Oleksij Rempel
2018-11-27  7:58   ` Sascha Hauer
2018-11-27  7:37 ` [PATCH v2 03/10] pbl: enable MIPS for PBL_RELOCATABLE Oleksij Rempel
2018-11-27  7:37 ` Oleksij Rempel [this message]
2018-11-27  7:37 ` [PATCH v2 05/10] MIPS: multiimage: add ENTRY_FUNCTION macros Oleksij Rempel
2018-11-27  8:04   ` Sascha Hauer
2018-11-27 10:15     ` Antony Pavlov
2018-11-27  7:37 ` [PATCH v2 06/10] MIPS: mutliimage: pass devicetree from PBL to the main_entry Oleksij Rempel
2018-11-27  7:37 ` [PATCH v2 07/10] MIPS: put main_entry to __bare_init section Oleksij Rempel
2018-11-27  7:37 ` [PATCH v2 08/10] MIPS: port all mach* to multiimage Oleksij Rempel
2018-11-27  8:10   ` Sascha Hauer
2018-11-27  7:37 ` [PATCH v2 09/10] MIPS: remove HAS_NO_BOARD_HL_CODE support Oleksij Rempel
2018-11-27  7:37 ` [PATCH v2 10/10] MIPS: remove useless board files Oleksij Rempel

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