git.sur5r.net Git - u-boot/blob - arch/arm/cpu/armv8/transition.S

   1 /*
   2  * (C) Copyright 2013
   3  * David Feng <fenghua@phytium.com.cn>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <asm-offsets.h>
   9 #include <config.h>
  10 #include <linux/linkage.h>
  11 #include <asm/macro.h>
  12
  13 ENTRY(armv8_switch_to_el2)
  14         switch_el x5, 1f, 0f, 0f
  15 0:
  16         /*
  17          * x3 is kernel entry point or switch_to_el1
  18          * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.
  19          * When running in EL2 now, jump to the
  20          * address saved in x3.
  21          */
  22         br x3
  23 1:      armv8_switch_to_el2_m x3, x4, x5
  24 ENDPROC(armv8_switch_to_el2)
  25
  26 ENTRY(armv8_switch_to_el1)
  27         switch_el x5, 0f, 1f, 0f
  28 0:
  29         /* x3 is kernel entry point. When running in EL1
  30          * now, jump to the address saved in x3.
  31          */
  32         br x3
  33 1:      armv8_switch_to_el1_m x3, x4, x5
  34 ENDPROC(armv8_switch_to_el1)