diff options
Diffstat (limited to 'arch/arm/mach-rockchip/save_boot_param.S')
| -rw-r--r-- | arch/arm/mach-rockchip/save_boot_param.S | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/mach-rockchip/save_boot_param.S b/arch/arm/mach-rockchip/save_boot_param.S new file mode 100644 index 0000000..85b407b --- /dev/null +++ b/arch/arm/mach-rockchip/save_boot_param.S @@ -0,0 +1,32 @@ +/* + * (C) Copyright 2016 Rockchip Electronics Co., Ltd + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <linux/linkage.h> + +.globl SAVE_SP_ADDR +SAVE_SP_ADDR: + .word 0 + +/* + * void save_boot_params + * + * Save sp, lr, r1~r12 + */ +ENTRY(save_boot_params) + push {r1-r12, lr} + ldr r0, =SAVE_SP_ADDR + str sp, [r0] + b save_boot_params_ret @ back to my caller +ENDPROC(save_boot_params) + + +.globl back_to_bootrom +ENTRY(back_to_bootrom) + ldr r0, =SAVE_SP_ADDR + ldr sp, [r0] + mov r0, #0 + pop {r1-r12, pc} +ENDPROC(back_to_bootrom) |