diff options
Diffstat (limited to 'arch/arm/mach-mediatek/mt7986/lowlevel_init.S')
| -rw-r--r-- | arch/arm/mach-mediatek/mt7986/lowlevel_init.S | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/mach-mediatek/mt7986/lowlevel_init.S b/arch/arm/mach-mediatek/mt7986/lowlevel_init.S new file mode 100644 index 0000000000..85a1cea359 --- /dev/null +++ b/arch/arm/mach-mediatek/mt7986/lowlevel_init.S @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2022 MediaTek Inc. + * Author: Sam Shih <sam.shih@mediatek.com> + */ + +/* + * Switch from AArch64 EL2 to AArch32 EL2 + * @param inputs: + * x0: argument, zero + * x1: machine nr + * x2: fdt address + * x3: input argument + * x4: kernel entry point + * @param outputs for secure firmware: + * x0: function id + * x1: kernel entry point + * x2: machine nr + * x3: fdt address + * + * [1] https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/mediatek/common/mtk_sip_svc.c +*/ + +.global armv8_el2_to_aarch32 +armv8_el2_to_aarch32: + mov x3, x2 + mov x2, x1 + mov x1, x4 + mov x4, #0 + ldr x0, =0x82000200 /* MTK_SIP_KERNEL_BOOT_AARCH32 */ + SMC #0 + ret |