diff mbox series

[v2,05/10] RISC-V: Add early startup code

Message ID 20181114131138.43713-6-agraf@suse.de
State Superseded
Headers show
Series Add RISC-V support | expand

Commit Message

Alexander Graf Nov. 14, 2018, 1:11 p.m. UTC 
On entry, we need to save the system table pointer as well as our image
handle. Add an early startup file that saves them and then brings us
into our main function.

Signed-off-by: Alexander Graf <agraf@suse.de>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

---
 grub-core/kern/riscv/efi/startup.S | 49 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 grub-core/kern/riscv/efi/startup.S

-- 
2.12.3


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Comments

Bin Meng Nov. 14, 2018, 3:12 p.m. UTC | #1 
On Wed, Nov 14, 2018 at 9:11 PM Alexander Graf <agraf@suse.de> wrote:
>

> On entry, we need to save the system table pointer as well as our image

> handle. Add an early startup file that saves them and then brings us

> into our main function.

>

> Signed-off-by: Alexander Graf <agraf@suse.de>

> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

> ---

>  grub-core/kern/riscv/efi/startup.S | 49 ++++++++++++++++++++++++++++++++++++++

>  1 file changed, 49 insertions(+)

>  create mode 100644 grub-core/kern/riscv/efi/startup.S

>


Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

Tested via 'bootefi' command from U-Boot on QEMU riscv64
Tested-by: Bin Meng <bmeng.cn@gmail.com>


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diff mbox series

Patch

diff --git a/grub-core/kern/riscv/efi/startup.S b/grub-core/kern/riscv/efi/startup.S
new file mode 100644
index 000000000..026f99bab
--- /dev/null
+++ b/grub-core/kern/riscv/efi/startup.S
@@ -0,0 +1,49 @@ 
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+#if __riscv_xlen == 64
+#define sl		sd
+#define ll		ld
+#else
+#define sl		sw
+#define ll		lw
+#endif
+
+
+	.file 	"startup.S"
+	.text
+FUNCTION(_start)
+	/*
+	 *  EFI_SYSTEM_TABLE and EFI_HANDLE are passed in a1/a0.
+	 */
+
+	ll	a2, efi_image_handle_val
+	sl	a0, 0(a2)
+	ll	a2, efi_system_table_val
+	sl	a1, 0(a2)
+	ll	a2, grub_main_val
+	jr	a2
+grub_main_val:
+	.quad	EXT_C(grub_main)
+efi_system_table_val:
+	.quad	EXT_C(grub_efi_system_table)
+efi_image_handle_val:
+	.quad	EXT_C(grub_efi_image_handle)
+