arm64: rsi: Add RSI definitions

/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * Copyright (C) 2023 ARM Ltd.

 */

#ifndef __ASM_RSI_CMDS_H

#define __ASM_RSI_CMDS_H

#include <linux/arm-smccc.h>

#include <asm/rsi_smc.h>

#define RSI_GRANULE_SHIFT		12

#define RSI_GRANULE_SIZE		(_AC(1, UL) << RSI_GRANULE_SHIFT)

enum ripas {

	RSI_RIPAS_EMPTY = 0,

	RSI_RIPAS_RAM = 1,

	RSI_RIPAS_DESTROYED = 2,

	RSI_RIPAS_DEV = 3,

};

static inline unsigned long rsi_request_version(unsigned long req,

						unsigned long *out_lower,

						unsigned long *out_higher)

{

	struct arm_smccc_res res;

	arm_smccc_smc(SMC_RSI_ABI_VERSION, req, 0, 0, 0, 0, 0, 0, &res);

	if (out_lower)

		*out_lower = res.a1;

	if (out_higher)

		*out_higher = res.a2;

	return res.a0;

}

static inline unsigned long rsi_get_realm_config(struct realm_config *cfg)

{

	struct arm_smccc_res res;

	arm_smccc_smc(SMC_RSI_REALM_CONFIG, virt_to_phys(cfg),

		      0, 0, 0, 0, 0, 0, &res);

	return res.a0;

}

static inline long rsi_set_addr_range_state(phys_addr_t start,

					    phys_addr_t end,

					    enum ripas state,

					    unsigned long flags,

					    phys_addr_t *top)

{

	struct arm_smccc_res res;

	arm_smccc_smc(SMC_RSI_IPA_STATE_SET, start, end, state,

		      flags, 0, 0, 0, &res);

	if (top)

		*top = res.a1;

	if (res.a2 != RSI_ACCEPT)

		return -EPERM;

	return res.a0;

}

/**

 * rsi_attestation_token_init - Initialise the operation to retrieve an

 * attestation token.

 *

 * @challenge:	The challenge data to be used in the attestation token

 *		generation.

 * @size:	Size of the challenge data in bytes.

 *

 * Initialises the attestation token generation and returns an upper bound

 * on the attestation token size that can be used to allocate an adequate

 * buffer. The caller is expected to subsequently call

 * rsi_attestation_token_continue() to retrieve the attestation token data on

 * the same CPU.

 *

 * Returns:

 *  On success, returns the upper limit of the attestation report size.

 *  Otherwise, -EINVAL

 */

static inline long

rsi_attestation_token_init(const u8 *challenge, unsigned long size)

{

	struct arm_smccc_1_2_regs regs = { 0 };

	/* The challenge must be at least 32bytes and at most 64bytes */

	if (!challenge || size < 32 || size > 64)

		return -EINVAL;

	regs.a0 = SMC_RSI_ATTESTATION_TOKEN_INIT;

	memcpy(&regs.a1, challenge, size);

	arm_smccc_1_2_smc(&regs, &regs);

	if (regs.a0 == RSI_SUCCESS)

		return regs.a1;

	return -EINVAL;

}

/**

 * rsi_attestation_token_continue - Continue the operation to retrieve an

 * attestation token.

 *

 * @granule: {I}PA of the Granule to which the token will be written.

 * @offset:  Offset within Granule to start of buffer in bytes.

 * @size:    The size of the buffer.

 * @len:     The number of bytes written to the buffer.

 *

 * Retrieves up to a RSI_GRANULE_SIZE worth of token data per call. The caller

 * is expected to call rsi_attestation_token_init() before calling this

 * function to retrieve the attestation token.

 *

 * Return:

 * * %RSI_SUCCESS     - Attestation token retrieved successfully.

 * * %RSI_INCOMPLETE  - Token generation is not complete.

 * * %RSI_ERROR_INPUT - A parameter was not valid.

 * * %RSI_ERROR_STATE - Attestation not in progress.

 */

static inline unsigned long rsi_attestation_token_continue(phys_addr_t granule,

							   unsigned long offset,

							   unsigned long size,

							   unsigned long *len)

{

	struct arm_smccc_res res;

	arm_smccc_1_1_invoke(SMC_RSI_ATTESTATION_TOKEN_CONTINUE,

			     granule, offset, size, 0, &res);

	if (len)

		*len = res.a1;

	return res.a0;

}

#endif /* __ASM_RSI_CMDS_H */

/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * Copyright (C) 2023 ARM Ltd.

 */

#ifndef __ASM_RSI_SMC_H_

#define __ASM_RSI_SMC_H_

#include <linux/arm-smccc.h>

/*

 * This file describes the Realm Services Interface (RSI) Application Binary

 * Interface (ABI) for SMC calls made from within the Realm to the RMM and

 * serviced by the RMM.

 */

/*

 * The major version number of the RSI implementation.  This is increased when

 * the binary format or semantics of the SMC calls change.

 */

#define RSI_ABI_VERSION_MAJOR		UL(1)

/*

 * The minor version number of the RSI implementation.  This is increased when

 * a bug is fixed, or a feature is added without breaking binary compatibility.

 */

#define RSI_ABI_VERSION_MINOR		UL(0)

#define RSI_ABI_VERSION			((RSI_ABI_VERSION_MAJOR << 16) | \

					 RSI_ABI_VERSION_MINOR)

#define RSI_ABI_VERSION_GET_MAJOR(_version) ((_version) >> 16)

#define RSI_ABI_VERSION_GET_MINOR(_version) ((_version) & 0xFFFF)

#define RSI_SUCCESS		UL(0)

#define RSI_ERROR_INPUT		UL(1)

#define RSI_ERROR_STATE		UL(2)

#define RSI_INCOMPLETE		UL(3)

#define RSI_ERROR_UNKNOWN	UL(4)

#define SMC_RSI_FID(n)		ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL,      \

						   ARM_SMCCC_SMC_64,         \

						   ARM_SMCCC_OWNER_STANDARD, \

						   n)

/*

 * Returns RSI version.

 *

 * arg1 == Requested interface revision

 * ret0 == Status / error

 * ret1 == Lower implemented interface revision

 * ret2 == Higher implemented interface revision

 */

#define SMC_RSI_ABI_VERSION	SMC_RSI_FID(0x190)

/*

 * Read feature register.

 *

 * arg1 == Feature register index

 * ret0 == Status / error

 * ret1 == Feature register value

 */

#define SMC_RSI_FEATURES			SMC_RSI_FID(0x191)

/*

 * Read measurement for the current Realm.

 *

 * arg1 == Index, which measurements slot to read

 * ret0 == Status / error

 * ret1 == Measurement value, bytes:  0 -  7

 * ret2 == Measurement value, bytes:  8 - 15

 * ret3 == Measurement value, bytes: 16 - 23

 * ret4 == Measurement value, bytes: 24 - 31

 * ret5 == Measurement value, bytes: 32 - 39

 * ret6 == Measurement value, bytes: 40 - 47

 * ret7 == Measurement value, bytes: 48 - 55

 * ret8 == Measurement value, bytes: 56 - 63

 */

#define SMC_RSI_MEASUREMENT_READ		SMC_RSI_FID(0x192)

/*

 * Extend Realm Extensible Measurement (REM) value.

 *

 * arg1  == Index, which measurements slot to extend

 * arg2  == Size of realm measurement in bytes, max 64 bytes

 * arg3  == Measurement value, bytes:  0 -  7

 * arg4  == Measurement value, bytes:  8 - 15

 * arg5  == Measurement value, bytes: 16 - 23

 * arg6  == Measurement value, bytes: 24 - 31

 * arg7  == Measurement value, bytes: 32 - 39

 * arg8  == Measurement value, bytes: 40 - 47

 * arg9  == Measurement value, bytes: 48 - 55

 * arg10 == Measurement value, bytes: 56 - 63

 * ret0  == Status / error

 */

#define SMC_RSI_MEASUREMENT_EXTEND		SMC_RSI_FID(0x193)

/*

 * Initialize the operation to retrieve an attestation token.

 *

 * arg1 == Challenge value, bytes:  0 -  7

 * arg2 == Challenge value, bytes:  8 - 15

 * arg3 == Challenge value, bytes: 16 - 23

 * arg4 == Challenge value, bytes: 24 - 31

 * arg5 == Challenge value, bytes: 32 - 39

 * arg6 == Challenge value, bytes: 40 - 47

 * arg7 == Challenge value, bytes: 48 - 55

 * arg8 == Challenge value, bytes: 56 - 63

 * ret0 == Status / error

 * ret1 == Upper bound of token size in bytes

 */

#define SMC_RSI_ATTESTATION_TOKEN_INIT		SMC_RSI_FID(0x194)

/*

 * Continue the operation to retrieve an attestation token.

 *

 * arg1 == The IPA of token buffer

 * arg2 == Offset within the granule of the token buffer

 * arg3 == Size of the granule buffer

 * ret0 == Status / error

 * ret1 == Length of token bytes copied to the granule buffer

 */

#define SMC_RSI_ATTESTATION_TOKEN_CONTINUE	SMC_RSI_FID(0x195)

#ifndef __ASSEMBLY__

struct realm_config {

	union {

		struct {

			unsigned long ipa_bits; /* Width of IPA in bits */

			unsigned long hash_algo; /* Hash algorithm */

		};

		u8 pad[0x200];

	};

	union {

		u8 rpv[64]; /* Realm Personalization Value */

		u8 pad2[0xe00];

	};

	/*

	 * The RMM requires the configuration structure to be aligned to a 4k

	 * boundary, ensure this happens by aligning this structure.

	 */

} __aligned(0x1000);

#endif /* __ASSEMBLY__ */

/*

 * Read configuration for the current Realm.

 *

 * arg1 == struct realm_config addr

 * ret0 == Status / error

 */

#define SMC_RSI_REALM_CONFIG			SMC_RSI_FID(0x196)

/*

 * Request RIPAS of a target IPA range to be changed to a specified value.

 *

 * arg1 == Base IPA address of target region

 * arg2 == Top of the region

 * arg3 == RIPAS value

 * arg4 == flags

 * ret0 == Status / error

 * ret1 == Top of modified IPA range

 * ret2 == Whether the Host accepted or rejected the request

 */

#define SMC_RSI_IPA_STATE_SET			SMC_RSI_FID(0x197)

#define RSI_NO_CHANGE_DESTROYED			UL(0)

#define RSI_CHANGE_DESTROYED			UL(1)

#define RSI_ACCEPT				UL(0)

#define RSI_REJECT				UL(1)

/*

 * Get RIPAS of a target IPA range.

 *

 * arg1 == Base IPA of target region

 * arg2 == End of target IPA region

 * ret0 == Status / error

 * ret1 == Top of IPA region which has the reported RIPAS value

 * ret2 == RIPAS value

 */

#define SMC_RSI_IPA_STATE_GET			SMC_RSI_FID(0x198)

/*

 * Make a Host call.

 *

 * arg1 == IPA of host call structure

 * ret0 == Status / error

 */

#define SMC_RSI_HOST_CALL			SMC_RSI_FID(0x199)

#endif /* __ASM_RSI_SMC_H_ */