arch/arm/kernel/smccc-call.S

   1 /*
   2  * Copyright (c) 2015, Linaro Limited
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14 #include <linux/linkage.h>
  15
  16 #include <asm/opcodes-sec.h>
  17 #include <asm/opcodes-virt.h>
  18 #include <asm/unwind.h>
  19 #include <asm/export.h>
  20
  21         /*
  22          * Wrap c macros in asm macros to delay expansion until after the
  23          * SMCCC asm macro is expanded.
  24          */
  25         .macro SMCCC_SMC
  26         __SMC(0)
  27         .endm
  28
  29         .macro SMCCC_HVC
  30         __HVC(0)
  31         .endm
  32
  33         .macro SMCCC instr
  34 UNWIND( .fnstart)
  35         mov     r12, sp
  36         push    {r4-r7}
  37 UNWIND( .save   {r4-r7})
  38         ldm     r12, {r4-r7}
  39         \instr
  40         pop     {r4-r7}
  41         ldr     r12, [sp, #(4 * 4)]
  42         stm     r12, {r0-r3}
  43         bx      lr
  44 UNWIND( .fnend)
  45         .endm
  46
  47 /*
  48  * void smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2,
  49  *                unsigned long a3, unsigned long a4, unsigned long a5,
  50  *                unsigned long a6, unsigned long a7, struct arm_smccc_res *res)
  51  */
  52 ENTRY(arm_smccc_smc)
  53         SMCCC SMCCC_SMC
  54 ENDPROC(arm_smccc_smc)
  55 EXPORT_SYMBOL(arm_smccc_smc)
  56
  57 /*
  58  * void smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2,
  59  *                unsigned long a3, unsigned long a4, unsigned long a5,
  60  *                unsigned long a6, unsigned long a7, struct arm_smccc_res *res)
  61  */
  62 ENTRY(arm_smccc_hvc)
  63         SMCCC SMCCC_HVC
  64 ENDPROC(arm_smccc_hvc)
  65 EXPORT_SYMBOL(arm_smccc_hvc)