LXR linux/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
  33UNWIND( .fnstart)
  34        mov     r12, sp
  35        push    {r4-r7}
  36UNWIND( .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
  43UNWIND( .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 */
  51ENTRY(arm_smccc_smc)
  52        SMCCC SMCCC_SMC
  53ENDPROC(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 */
  60ENTRY(arm_smccc_hvc)
  61        SMCCC SMCCC_HVC
  62ENDPROC(arm_smccc_hvc)
  63