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
  20         /*
  21          * Wrap c macros in asm macros to delay expansion until after the
  22          * SMCCC asm macro is expanded.
  23          */
  24         .macro SMCCC_SMC
  25         __SMC(0)
  26         .endm
  27
  28         .macro SMCCC_HVC
  29         __HVC(0)
  30         .endm
  31
  32         .macro SMCCC instr
  33 UNWIND( .fnstart)
  34         mov     r12, sp
  35         push    {r4-r7}
  36 UNWIND( .save   {r4-r7})
  37         ldm     r12, {r4-r7}
  38         \instr
  39         pop     {r4-r7}
  40         ldr     r12, [sp, #(4 * 4)]
  41         stm     r12, {r0-r3}
  42         bx      lr
  43 UNWIND( .fnend)
  44         .endm
  45
  46 /*
  47  * void smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2,
  48  *                unsigned long a3, unsigned long a4, unsigned long a5,
  49  *                unsigned long a6, unsigned long a7, struct arm_smccc_res *res)
  50  */
  51 ENTRY(arm_smccc_smc)
  52         SMCCC SMCCC_SMC
  53 ENDPROC(arm_smccc_smc)
  54
  55 /*
  56  * void smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2,
  57  *                unsigned long a3, unsigned long a4, unsigned long a5,
  58  *                unsigned long a6, unsigned long a7, struct arm_smccc_res *res)
  59  */
  60 ENTRY(arm_smccc_hvc)
  61         SMCCC SMCCC_HVC
  62 ENDPROC(arm_smccc_hvc)