include/linux/arm-smccc.h

   1 /*
   2  * Copyright (c) 2015, Linaro Limited
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6 #ifndef __LINUX_ARM_SMCCC_H
   7 #define __LINUX_ARM_SMCCC_H
   8
   9 /*
  10  * This file provides common defines for ARM SMC Calling Convention as
  11  * specified in
  12  * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
  13  */
  14
  15 #define ARM_SMCCC_STD_CALL              0
  16 #define ARM_SMCCC_FAST_CALL             1
  17 #define ARM_SMCCC_TYPE_SHIFT            31
  18
  19 #define ARM_SMCCC_SMC_32                0
  20 #define ARM_SMCCC_SMC_64                1
  21 #define ARM_SMCCC_CALL_CONV_SHIFT       30
  22
  23 #define ARM_SMCCC_OWNER_MASK            0x3F
  24 #define ARM_SMCCC_OWNER_SHIFT           24
  25
  26 #define ARM_SMCCC_FUNC_MASK             0xFFFF
  27
  28 #define ARM_SMCCC_IS_FAST_CALL(smc_val) \
  29         ((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
  30 #define ARM_SMCCC_IS_64(smc_val) \
  31         ((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
  32 #define ARM_SMCCC_FUNC_NUM(smc_val)     ((smc_val) & ARM_SMCCC_FUNC_MASK)
  33 #define ARM_SMCCC_OWNER_NUM(smc_val) \
  34         (((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
  35
  36 #define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
  37         (((type) << ARM_SMCCC_TYPE_SHIFT) | \
  38         ((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
  39         (((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
  40         ((func_num) & ARM_SMCCC_FUNC_MASK))
  41
  42 #define ARM_SMCCC_OWNER_ARCH            0
  43 #define ARM_SMCCC_OWNER_CPU             1
  44 #define ARM_SMCCC_OWNER_SIP             2
  45 #define ARM_SMCCC_OWNER_OEM             3
  46 #define ARM_SMCCC_OWNER_STANDARD        4
  47 #define ARM_SMCCC_OWNER_TRUSTED_APP     48
  48 #define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
  49 #define ARM_SMCCC_OWNER_TRUSTED_OS      50
  50 #define ARM_SMCCC_OWNER_TRUSTED_OS_END  63
  51
  52 #define ARM_SMCCC_QUIRK_NONE            0
  53 #define ARM_SMCCC_QUIRK_QCOM_A6         1 /* Save/restore register a6 */
  54
  55 #ifndef __ASSEMBLY__
  56
  57 #include <linux/linkage.h>
  58 #include <linux/types.h>
  59 /**
  60  * struct arm_smccc_res - Result from SMC/HVC call
  61  * @a0-a3 result values from registers 0 to 3
  62  */
  63 struct arm_smccc_res {
  64         unsigned long a0;
  65         unsigned long a1;
  66         unsigned long a2;
  67         unsigned long a3;
  68 };
  69
  70 /**
  71  * struct arm_smccc_quirk - Contains quirk information
  72  * @id: quirk identification
  73  * @state: quirk specific information
  74  * @a6: Qualcomm quirk entry for returning post-smc call contents of a6
  75  */
  76 struct arm_smccc_quirk {
  77         int     id;
  78         union {
  79                 unsigned long a6;
  80         } state;
  81 };
  82
  83 /**
  84  * __arm_smccc_smc() - make SMC calls
  85  * @a0-a7: arguments passed in registers 0 to 7
  86  * @res: result values from registers 0 to 3
  87  * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
  88  *
  89  * This function is used to make SMC calls following SMC Calling Convention.
  90  * The content of the supplied param are copied to registers 0 to 7 prior
  91  * to the SMC instruction. The return values are updated with the content
  92  * from register 0 to 3 on return from the SMC instruction.  An optional
  93  * quirk structure provides vendor specific behavior.
  94  */
  95 asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
  96                         unsigned long a2, unsigned long a3, unsigned long a4,
  97                         unsigned long a5, unsigned long a6, unsigned long a7,
  98                         struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
  99
 100 /**
 101  * __arm_smccc_hvc() - make HVC calls
 102  * @a0-a7: arguments passed in registers 0 to 7
 103  * @res: result values from registers 0 to 3
 104  * @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
 105  *
 106  * This function is used to make HVC calls following SMC Calling
 107  * Convention.  The content of the supplied param are copied to registers 0
 108  * to 7 prior to the HVC instruction. The return values are updated with
 109  * the content from register 0 to 3 on return from the HVC instruction.  An
 110  * optional quirk structure provides vendor specific behavior.
 111  */
 112 asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
 113                         unsigned long a2, unsigned long a3, unsigned long a4,
 114                         unsigned long a5, unsigned long a6, unsigned long a7,
 115                         struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
 116
 117 #define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
 118
 119 #define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
 120
 121 #define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
 122
 123 #define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
 124
 125 #endif /*__ASSEMBLY__*/
 126 #endif /*__LINUX_ARM_SMCCC_H*/