diff options
Diffstat (limited to 'roms/u-boot/arch/arm/cpu/armv8/transition.S')
| -rw-r--r-- | roms/u-boot/arch/arm/cpu/armv8/transition.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/cpu/armv8/transition.S b/roms/u-boot/arch/arm/cpu/armv8/transition.S new file mode 100644 index 000000000..a31af4ffc --- /dev/null +++ b/roms/u-boot/arch/arm/cpu/armv8/transition.S @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * (C) Copyright 2013 + * David Feng <fenghua@phytium.com.cn> + */ + +#include <asm-offsets.h> +#include <config.h> +#include <linux/linkage.h> +#include <asm/macro.h> + +.pushsection .text.armv8_switch_to_el2, "ax" +ENTRY(armv8_switch_to_el2) + switch_el x6, 1f, 0f, 0f +0: + cmp x5, #ES_TO_AARCH64 + b.eq 2f + /* + * When loading 32-bit kernel, it will jump + * to secure firmware again, and never return. + */ + bl armv8_el2_to_aarch32 +2: + /* + * x4 is kernel entry point or switch_to_el1 + * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined. + * When running in EL2 now, jump to the + * address saved in x4. + */ + br x4 +1: armv8_switch_to_el2_m x4, x5, x6 +ENDPROC(armv8_switch_to_el2) +.popsection + +.pushsection .text.armv8_switch_to_el1, "ax" +ENTRY(armv8_switch_to_el1) + switch_el x6, 0f, 1f, 0f +0: + /* x4 is kernel entry point. When running in EL1 + * now, jump to the address saved in x4. + */ + br x4 +1: armv8_switch_to_el1_m x4, x5, x6 +ENDPROC(armv8_switch_to_el1) +.popsection + +.pushsection .text.armv8_el2_to_aarch32, "ax" +WEAK(armv8_el2_to_aarch32) + ret +ENDPROC(armv8_el2_to_aarch32) +.popsection |