From: Andre Przywara <andre.przywara@arm.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v3 03/26] armv8: add lowlevel_init.S
Date: Mon, 19 Dec 2016 01:49:53 +0000 [thread overview]
Message-ID: <1482112216-12983-4-git-send-email-andre.przywara@arm.com> (raw)
In-Reply-To: <1482112216-12983-1-git-send-email-andre.przywara@arm.com>
For boards that call s_init() when the SPL runs, we are expected to
setup an early stack before calling this C function.
Implement the proper AArch64 version of this based on the ARMv7 code.
This allows sunxi boards to setup the basic peripherals even with a
64-bit SPL.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
arch/arm/cpu/armv8/Makefile | 1 +
arch/arm/cpu/armv8/lowlevel_init.S | 44 ++++++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
create mode 100644 arch/arm/cpu/armv8/lowlevel_init.S
diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile
index dea1465..799a752 100644
--- a/arch/arm/cpu/armv8/Makefile
+++ b/arch/arm/cpu/armv8/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_FSL_LAYERSCAPE) += fsl-layerscape/
obj-$(CONFIG_S32V234) += s32v234/
obj-$(CONFIG_ARCH_ZYNQMP) += zynqmp/
obj-$(CONFIG_TARGET_HIKEY) += hisilicon/
+obj-$(CONFIG_ARCH_SUNXI) += lowlevel_init.o
diff --git a/arch/arm/cpu/armv8/lowlevel_init.S b/arch/arm/cpu/armv8/lowlevel_init.S
new file mode 100644
index 0000000..189e35f
--- /dev/null
+++ b/arch/arm/cpu/armv8/lowlevel_init.S
@@ -0,0 +1,44 @@
+/*
+ * A lowlevel_init function that sets up the stack to call a C function to
+ * perform further init.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+
+ENTRY(lowlevel_init)
+ /*
+ * Setup a temporary stack. Global data is not available yet.
+ */
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
+ ldr w0, =CONFIG_SPL_STACK
+#else
+ ldr w0, =CONFIG_SYS_INIT_SP_ADDR
+#endif
+ bic sp, x0, #0xf /* 16-byte alignment for ABI compliance */
+
+ /*
+ * Save the old LR(passed in x29) and the current LR to stack
+ */
+ stp x29, x30, [sp, #-16]!
+
+ /*
+ * Call the very early init function. This should do only the
+ * absolute bare minimum to get started. It should not:
+ *
+ * - set up DRAM
+ * - use global_data
+ * - clear BSS
+ * - try to start a console
+ *
+ * For boards with SPL this should be empty since SPL can do all of
+ * this init in the SPL board_init_f() function which is called
+ * immediately after this.
+ */
+ bl s_init
+ ldp x29, x30, [sp]
+ ret
+ENDPROC(lowlevel_init)
--
2.8.2
next prev parent reply other threads:[~2016-12-19 1:49 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-19 1:49 [U-Boot] [PATCH v3 00/26] sunxi: Allwinner A64: SPL support Andre Przywara
2016-12-19 1:49 ` [U-Boot] [PATCH v3 01/26] sun6i: Restrict some register initialization to Allwinner A31 SoC Andre Przywara
2016-12-19 1:49 ` [U-Boot] [PATCH v3 02/26] armv8: prevent using THUMB Andre Przywara
2016-12-19 1:49 ` Andre Przywara [this message]
2016-12-26 5:23 ` [U-Boot] [PATCH v3 03/26] armv8: add lowlevel_init.S Simon Glass
2016-12-19 1:49 ` [U-Boot] [PATCH v3 04/26] SPL: tiny-printf: add "l" modifier Andre Przywara
2016-12-19 1:49 ` [U-Boot] [PATCH v3 05/26] SPL: tiny-printf: ignore "-" modifier Andre Przywara
2016-12-26 5:23 ` Simon Glass
2016-12-19 1:49 ` [U-Boot] [PATCH v3 06/26] move UL() macro from armv8/mmu.h into common.h Andre Przywara
2016-12-19 1:49 ` [U-Boot] [PATCH v3 07/26] SPL: make struct spl_image 64-bit safe Andre Przywara
2016-12-19 1:49 ` [U-Boot] [PATCH v3 08/26] armv8: add simple sdelay implementation Andre Przywara
2016-12-19 1:49 ` [U-Boot] [PATCH v3 09/26] armv8: move reset branch into boot hook Andre Przywara
2016-12-19 1:50 ` [U-Boot] [PATCH v3 10/26] ARM: boot0 hook: remove macro, include whole header file Andre Przywara
2016-12-30 20:41 ` Steve Rae
2016-12-19 1:50 ` [U-Boot] [PATCH v3 11/26] sunxi: introduce extra config option for boot0 header Andre Przywara
2016-12-19 1:50 ` [U-Boot] [PATCH v3 12/26] sunxi: A64: do an RMR switch if started in AArch32 mode Andre Przywara
2016-12-19 9:43 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 13/26] sunxi: provide default DRAM config for sun50i in Kconfig Andre Przywara
2016-12-19 9:43 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 14/26] sunxi: H3: Rework MBUS priority setup Andre Przywara
2016-12-19 9:44 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 15/26] sunxi: H3: add and rename some DRAM contoller registers Andre Przywara
2016-12-19 1:50 ` [U-Boot] [PATCH v3 16/26] sunxi: H3: add DRAM controller single bit delay support Andre Przywara
2016-12-19 9:57 ` Maxime Ripard
2016-12-19 10:53 ` Andre Przywara
2016-12-20 13:48 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 17/26] sunxi: clocks: Use the correct pattern register for PLL11 Andre Przywara
2016-12-19 9:58 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 18/26] sunxi: A64: use H3 DRAM initialization code for A64 as well Andre Przywara
2016-12-19 10:00 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 19/26] sunxi: H3/A64: fix non-ODT setting Andre Przywara
2016-12-19 10:01 ` Maxime Ripard
2016-12-19 10:33 ` Andre Przywara
2016-12-19 14:32 ` Jens Kuske
2016-12-20 10:49 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 20/26] sunxi: DRAM: fix H3 DRAM size display on aarch64 Andre Przywara
2016-12-19 10:01 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 21/26] sunxi: A64: enable SPL Andre Przywara
2016-12-19 10:01 ` Maxime Ripard
2016-12-26 5:23 ` Simon Glass
2016-12-19 1:50 ` [U-Boot] [PATCH v3 22/26] SPL: read and store arch property from U-Boot image Andre Przywara
2016-12-19 1:50 ` [U-Boot] [PATCH v3 23/26] Makefile: use "arm64" architecture for U-Boot image files Andre Przywara
2016-12-19 1:50 ` [U-Boot] [PATCH v3 24/26] ARM: SPL/FIT: differentiate between arm and arm64 arch properties Andre Przywara
2016-12-19 1:50 ` [U-Boot] [PATCH v3 25/26] sunxi: introduce RMR switch to enter payloads in 64-bit mode Andre Przywara
2016-12-19 10:03 ` Maxime Ripard
2016-12-19 1:50 ` [U-Boot] [PATCH v3 26/26] sunxi: A64: add 32-bit SPL support Andre Przywara
2016-12-19 10:05 ` Maxime Ripard
2017-01-01 19:02 ` [U-Boot] [PATCH v3 00/26] sunxi: Allwinner A64: " Jagan Teki
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