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0794a974d7
Using the same register-bound variable for both arguments and results means these values share a type. That type must allow the arguments to be assigned to it and must also be assignable to the unsigned long fields of struct arm_smccc_res. This restriction on types causes compiler warnings when the argument cannot be implicitly assigned to an unsigned long, for example the pointers that are used in the KVM hyp interface. By separating the arguments and results into their own variables, the type constraint is lifted allowing the arguments to avoid the need for any type conversion. Signed-off-by: Andrew Scull <ascull@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Cc: Sudeep Holla <sudeep.holla@arm.com> Link: https://lore.kernel.org/r/20200915104643.2543892-17-ascull@google.com
393 lines
13 KiB
C
393 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2015, Linaro Limited
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*/
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#ifndef __LINUX_ARM_SMCCC_H
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#define __LINUX_ARM_SMCCC_H
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#include <linux/init.h>
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#include <uapi/linux/const.h>
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/*
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* This file provides common defines for ARM SMC Calling Convention as
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* specified in
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* https://developer.arm.com/docs/den0028/latest
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*
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* This code is up-to-date with version DEN 0028 C
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*/
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#define ARM_SMCCC_STD_CALL _AC(0,U)
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#define ARM_SMCCC_FAST_CALL _AC(1,U)
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#define ARM_SMCCC_TYPE_SHIFT 31
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#define ARM_SMCCC_SMC_32 0
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#define ARM_SMCCC_SMC_64 1
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#define ARM_SMCCC_CALL_CONV_SHIFT 30
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#define ARM_SMCCC_OWNER_MASK 0x3F
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#define ARM_SMCCC_OWNER_SHIFT 24
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#define ARM_SMCCC_FUNC_MASK 0xFFFF
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#define ARM_SMCCC_IS_FAST_CALL(smc_val) \
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((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
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#define ARM_SMCCC_IS_64(smc_val) \
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((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
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#define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK)
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#define ARM_SMCCC_OWNER_NUM(smc_val) \
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(((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
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#define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
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(((type) << ARM_SMCCC_TYPE_SHIFT) | \
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((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
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(((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
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((func_num) & ARM_SMCCC_FUNC_MASK))
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#define ARM_SMCCC_OWNER_ARCH 0
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#define ARM_SMCCC_OWNER_CPU 1
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#define ARM_SMCCC_OWNER_SIP 2
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#define ARM_SMCCC_OWNER_OEM 3
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#define ARM_SMCCC_OWNER_STANDARD 4
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#define ARM_SMCCC_OWNER_STANDARD_HYP 5
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#define ARM_SMCCC_OWNER_VENDOR_HYP 6
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#define ARM_SMCCC_OWNER_TRUSTED_APP 48
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#define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
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#define ARM_SMCCC_OWNER_TRUSTED_OS 50
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#define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
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#define ARM_SMCCC_QUIRK_NONE 0
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#define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
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#define ARM_SMCCC_VERSION_1_0 0x10000
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#define ARM_SMCCC_VERSION_1_1 0x10001
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#define ARM_SMCCC_VERSION_1_2 0x10002
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#define ARM_SMCCC_VERSION_FUNC_ID \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 0)
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#define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 1)
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#define ARM_SMCCC_ARCH_SOC_ID \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 2)
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#define ARM_SMCCC_ARCH_WORKAROUND_1 \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 0x8000)
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#define ARM_SMCCC_ARCH_WORKAROUND_2 \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_32, \
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0, 0x7fff)
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/* Paravirtualised time calls (defined by ARM DEN0057A) */
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#define ARM_SMCCC_HV_PV_TIME_FEATURES \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_64, \
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ARM_SMCCC_OWNER_STANDARD_HYP, \
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0x20)
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#define ARM_SMCCC_HV_PV_TIME_ST \
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ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
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ARM_SMCCC_SMC_64, \
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ARM_SMCCC_OWNER_STANDARD_HYP, \
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0x21)
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/*
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* Return codes defined in ARM DEN 0070A
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* ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
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*/
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#define SMCCC_RET_SUCCESS 0
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#define SMCCC_RET_NOT_SUPPORTED -1
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#define SMCCC_RET_NOT_REQUIRED -2
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#define SMCCC_RET_INVALID_PARAMETER -3
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#ifndef __ASSEMBLY__
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#include <linux/linkage.h>
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#include <linux/types.h>
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enum arm_smccc_conduit {
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SMCCC_CONDUIT_NONE,
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SMCCC_CONDUIT_SMC,
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SMCCC_CONDUIT_HVC,
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};
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/**
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* arm_smccc_1_1_get_conduit()
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*
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* Returns the conduit to be used for SMCCCv1.1 or later.
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*
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* When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
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*/
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enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
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/**
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* arm_smccc_get_version()
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*
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* Returns the version to be used for SMCCCv1.1 or later.
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*
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* When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
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* does not imply the presence of firmware or a valid conduit. Caller
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* handling SMCCCv1.0 must determine the conduit by other means.
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*/
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u32 arm_smccc_get_version(void);
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void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
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/**
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* struct arm_smccc_res - Result from SMC/HVC call
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* @a0-a3 result values from registers 0 to 3
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*/
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struct arm_smccc_res {
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unsigned long a0;
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unsigned long a1;
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unsigned long a2;
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unsigned long a3;
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};
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/**
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* struct arm_smccc_quirk - Contains quirk information
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* @id: quirk identification
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* @state: quirk specific information
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* @a6: Qualcomm quirk entry for returning post-smc call contents of a6
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*/
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struct arm_smccc_quirk {
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int id;
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union {
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unsigned long a6;
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} state;
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};
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/**
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* __arm_smccc_smc() - make SMC calls
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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* @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
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*
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* This function is used to make SMC calls following SMC Calling Convention.
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* The content of the supplied param are copied to registers 0 to 7 prior
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* to the SMC instruction. The return values are updated with the content
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* from register 0 to 3 on return from the SMC instruction. An optional
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* quirk structure provides vendor specific behavior.
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*/
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asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3, unsigned long a4,
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unsigned long a5, unsigned long a6, unsigned long a7,
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struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
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/**
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* __arm_smccc_hvc() - make HVC calls
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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* @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
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*
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* This function is used to make HVC calls following SMC Calling
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* Convention. The content of the supplied param are copied to registers 0
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* to 7 prior to the HVC instruction. The return values are updated with
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* the content from register 0 to 3 on return from the HVC instruction. An
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* optional quirk structure provides vendor specific behavior.
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*/
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asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3, unsigned long a4,
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unsigned long a5, unsigned long a6, unsigned long a7,
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struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
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#define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
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#define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
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#define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
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#define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
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/* SMCCC v1.1 implementation madness follows */
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#ifdef CONFIG_ARM64
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#define SMCCC_SMC_INST "smc #0"
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#define SMCCC_HVC_INST "hvc #0"
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#elif defined(CONFIG_ARM)
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#include <asm/opcodes-sec.h>
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#include <asm/opcodes-virt.h>
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#define SMCCC_SMC_INST __SMC(0)
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#define SMCCC_HVC_INST __HVC(0)
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#endif
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#define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
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#define __count_args(...) \
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___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
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#define __constraint_read_0 "r" (arg0)
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#define __constraint_read_1 __constraint_read_0, "r" (arg1)
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#define __constraint_read_2 __constraint_read_1, "r" (arg2)
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#define __constraint_read_3 __constraint_read_2, "r" (arg3)
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#define __constraint_read_4 __constraint_read_3, "r" (arg4)
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#define __constraint_read_5 __constraint_read_4, "r" (arg5)
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#define __constraint_read_6 __constraint_read_5, "r" (arg6)
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#define __constraint_read_7 __constraint_read_6, "r" (arg7)
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#define __declare_arg_0(a0, res) \
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struct arm_smccc_res *___res = res; \
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register unsigned long arg0 asm("r0") = (u32)a0
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#define __declare_arg_1(a0, a1, res) \
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typeof(a1) __a1 = a1; \
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struct arm_smccc_res *___res = res; \
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register unsigned long arg0 asm("r0") = (u32)a0; \
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register typeof(a1) arg1 asm("r1") = __a1
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#define __declare_arg_2(a0, a1, a2, res) \
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typeof(a1) __a1 = a1; \
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typeof(a2) __a2 = a2; \
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struct arm_smccc_res *___res = res; \
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register unsigned long arg0 asm("r0") = (u32)a0; \
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register typeof(a1) arg1 asm("r1") = __a1; \
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register typeof(a2) arg2 asm("r2") = __a2
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#define __declare_arg_3(a0, a1, a2, a3, res) \
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typeof(a1) __a1 = a1; \
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typeof(a2) __a2 = a2; \
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typeof(a3) __a3 = a3; \
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struct arm_smccc_res *___res = res; \
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register unsigned long arg0 asm("r0") = (u32)a0; \
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register typeof(a1) arg1 asm("r1") = __a1; \
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register typeof(a2) arg2 asm("r2") = __a2; \
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register typeof(a3) arg3 asm("r3") = __a3
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#define __declare_arg_4(a0, a1, a2, a3, a4, res) \
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typeof(a4) __a4 = a4; \
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__declare_arg_3(a0, a1, a2, a3, res); \
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register typeof(a4) arg4 asm("r4") = __a4
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#define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
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typeof(a5) __a5 = a5; \
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__declare_arg_4(a0, a1, a2, a3, a4, res); \
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register typeof(a5) arg5 asm("r5") = __a5
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#define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
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typeof(a6) __a6 = a6; \
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__declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
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register typeof(a6) arg6 asm("r6") = __a6
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#define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
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typeof(a7) __a7 = a7; \
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__declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
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register typeof(a7) arg7 asm("r7") = __a7
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#define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
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#define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
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#define ___constraints(count) \
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: __constraint_read_ ## count \
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: "memory"
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#define __constraints(count) ___constraints(count)
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/*
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* We have an output list that is not necessarily used, and GCC feels
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* entitled to optimise the whole sequence away. "volatile" is what
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* makes it stick.
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*/
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#define __arm_smccc_1_1(inst, ...) \
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do { \
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register unsigned long r0 asm("r0"); \
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register unsigned long r1 asm("r1"); \
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register unsigned long r2 asm("r2"); \
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register unsigned long r3 asm("r3"); \
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__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
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asm volatile(inst "\n" : \
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"=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3) \
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__constraints(__count_args(__VA_ARGS__))); \
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if (___res) \
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*___res = (typeof(*___res)){r0, r1, r2, r3}; \
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} while (0)
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/*
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* arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
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*
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* This is a variadic macro taking one to eight source arguments, and
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* an optional return structure.
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*
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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*
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* This macro is used to make SMC calls following SMC Calling Convention v1.1.
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* The content of the supplied param are copied to registers 0 to 7 prior
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* to the SMC instruction. The return values are updated with the content
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* from register 0 to 3 on return from the SMC instruction if not NULL.
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*/
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#define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
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/*
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* arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
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*
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* This is a variadic macro taking one to eight source arguments, and
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* an optional return structure.
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*
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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*
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* This macro is used to make HVC calls following SMC Calling Convention v1.1.
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* The content of the supplied param are copied to registers 0 to 7 prior
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* to the HVC instruction. The return values are updated with the content
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* from register 0 to 3 on return from the HVC instruction if not NULL.
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*/
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#define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
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/*
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* Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
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* Used when the SMCCC conduit is not defined. The empty asm statement
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* avoids compiler warnings about unused variables.
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*/
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#define __fail_smccc_1_1(...) \
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do { \
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__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
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asm ("" : __constraints(__count_args(__VA_ARGS__))); \
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if (___res) \
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___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
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} while (0)
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/*
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* arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
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*
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* This is a variadic macro taking one to eight source arguments, and
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* an optional return structure.
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*
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* @a0-a7: arguments passed in registers 0 to 7
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* @res: result values from registers 0 to 3
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*
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* This macro will make either an HVC call or an SMC call depending on the
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* current SMCCC conduit. If no valid conduit is available then -1
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* (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
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*
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* The return value also provides the conduit that was used.
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*/
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#define arm_smccc_1_1_invoke(...) ({ \
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int method = arm_smccc_1_1_get_conduit(); \
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switch (method) { \
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case SMCCC_CONDUIT_HVC: \
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arm_smccc_1_1_hvc(__VA_ARGS__); \
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break; \
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case SMCCC_CONDUIT_SMC: \
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arm_smccc_1_1_smc(__VA_ARGS__); \
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break; \
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default: \
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__fail_smccc_1_1(__VA_ARGS__); \
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method = SMCCC_CONDUIT_NONE; \
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break; \
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} \
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method; \
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})
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#endif /*__ASSEMBLY__*/
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#endif /*__LINUX_ARM_SMCCC_H*/
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