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 .pushsection .text.armv8_switch_to_el2, "ax"
  14 ENTRY(armv8_switch_to_el2)
  15         switch_el x6, 1f, 0f, 0f
  16 0:
  17         cmp x5, #ES_TO_AARCH64
  18         b.eq 2f
  19         /*
  20          * When loading 32-bit kernel, it will jump
  21          * to secure firmware again, and never return.
  22          */
  23         bl armv8_el2_to_aarch32
  24 2:
  25         /*
  26          * x4 is kernel entry point or switch_to_el1
  27          * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.
  28          * When running in EL2 now, jump to the
  29          * address saved in x4.
  30          */
  31         br x4
  32 1:      armv8_switch_to_el2_m x4, x5, x6
  33 ENDPROC(armv8_switch_to_el2)
  34 .popsection
  35
  36 .pushsection .text.armv8_switch_to_el1, "ax"
  37 ENTRY(armv8_switch_to_el1)
  38         switch_el x6, 0f, 1f, 0f
  39 0:
  40         /* x4 is kernel entry point. When running in EL1
  41          * now, jump to the address saved in x4.
  42          */
  43         br x4
  44 1:      armv8_switch_to_el1_m x4, x5, x6
  45 ENDPROC(armv8_switch_to_el1)
  46 .popsection
  47
  48 .pushsection .text.armv8_el2_to_aarch32, "ax"
  49 WEAK(armv8_el2_to_aarch32)
  50         ret
  51 ENDPROC(armv8_el2_to_aarch32)
  52 .popsection