include/linux/arm-smccc.h

   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 #ifndef __LINUX_ARM_SMCCC_H
  15 #define __LINUX_ARM_SMCCC_H
  16
  17 /*
  18  * This file provides common defines for ARM SMC Calling Convention as
  19  * specified in
  20  * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
  21  */
  22
  23 #define ARM_SMCCC_STD_CALL              0
  24 #define ARM_SMCCC_FAST_CALL             1
  25 #define ARM_SMCCC_TYPE_SHIFT            31
  26
  27 #define ARM_SMCCC_SMC_32                0
  28 #define ARM_SMCCC_SMC_64                1
  29 #define ARM_SMCCC_CALL_CONV_SHIFT       30
  30
  31 #define ARM_SMCCC_OWNER_MASK            0x3F
  32 #define ARM_SMCCC_OWNER_SHIFT           24
  33
  34 #define ARM_SMCCC_FUNC_MASK             0xFFFF
  35
  36 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \
  37         ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
  38 #define ARM_SMCCC_IS_64(smc_val) \
  39         ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
  40 #define ARM_SMCCC_FUNC_NUM(smc_val)     ((smc_val) & ARM_SMCCC_FUNC_MASK)
  41 #define ARM_SMCCC_OWNER_NUM(smc_val) \
  42         (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
  43
  44 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
  45         (((type) << ARM_SMCCC_TYPE_SHIFT) | \
  46         ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
  47         (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
  48         ((func_num) & ARM_SMCCC_FUNC_MASK))
  49
  50 #define ARM_SMCCC_OWNER_ARCH            0
  51 #define ARM_SMCCC_OWNER_CPU             1
  52 #define ARM_SMCCC_OWNER_SIP             2
  53 #define ARM_SMCCC_OWNER_OEM             3
  54 #define ARM_SMCCC_OWNER_STANDARD        4
  55 #define ARM_SMCCC_OWNER_TRUSTED_APP     48
  56 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
  57 #define ARM_SMCCC_OWNER_TRUSTED_OS      50
  58 #define ARM_SMCCC_OWNER_TRUSTED_OS_END  63
  59
  60 #define ARM_SMCCC_QUIRK_NONE            0
  61 #define ARM_SMCCC_QUIRK_QCOM_A6         1 /* Save/restore register a6 */
  62
  63 #ifndef __ASSEMBLY__
  64
  65 #include <linux/linkage.h>
  66 #include <linux/types.h>
  67 /**
  68  * struct arm_smccc_res - Result from SMC/HVC call
  69  * @a0-a3 result values from registers 0 to 3
  70  */
  71 struct arm_smccc_res {
  72         unsigned long a0;
  73         unsigned long a1;
  74         unsigned long a2;
  75         unsigned long a3;
  76 };
  77
  78 /**
  79  * struct arm_smccc_quirk - Contains quirk information
  80  * @id: quirk identification
  81  * @state: quirk specific information
  82  * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
  83  */
  84 struct arm_smccc_quirk {
  85         int     id;
  86         union {
  87                 unsigned long a6;
  88         } state;
  89 };
  90
  91 /**
  92  * __arm_smccc_smc() - make SMC calls
  93  * @a0-a7: arguments passed in registers 0 to 7
  94  * @res: result values from registers 0 to 3
  95  * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
  96  *
  97  * This function is used to make SMC calls following SMC Calling Convention.
  98  * The content of the supplied param are copied to registers 0 to 7 prior
  99  * to the SMC instruction. The return values are updated with the content
 100  * from register 0 to 3 on return from the SMC instruction.  An optional
 101  * quirk structure provides vendor specific behavior.
 102  */
 103 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
 104                         unsigned long a2, unsigned long a3, unsigned long a4,
 105                         unsigned long a5, unsigned long a6, unsigned long a7,
 106                         struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
 107
 108 /**
 109  * __arm_smccc_hvc() - make HVC calls
 110  * @a0-a7: arguments passed in registers 0 to 7
 111  * @res: result values from registers 0 to 3
 112  * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
 113  *
 114  * This function is used to make HVC calls following SMC Calling
 115  * Convention.  The content of the supplied param are copied to registers 0
 116  * to 7 prior to the HVC instruction. The return values are updated with
 117  * the content from register 0 to 3 on return from the HVC instruction.  An
 118  * optional quirk structure provides vendor specific behavior.
 119  */
 120 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
 121                         unsigned long a2, unsigned long a3, unsigned long a4,
 122                         unsigned long a5, unsigned long a6, unsigned long a7,
 123                         struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
 124
 125 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
 126
 127 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
 128
 129 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
 130
 131 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
 132
 133 #endif /*__ASSEMBLY__*/
 134 #endif /*__LINUX_ARM_SMCCC_H*/