diff mbox series

[v5,03/19] arm64: rsi: Add RSI definitions

Message ID 20240819131924.372366-4-steven.price@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Support for running as a guest in Arm CCA | expand

Commit Message

Steven Price Aug. 19, 2024, 1:19 p.m. UTC
From: Suzuki K Poulose <suzuki.poulose@arm.com>

The RMM (Realm Management Monitor) provides functionality that can be
accessed by a realm guest through SMC (Realm Services Interface) calls.

The SMC definitions are based on DEN0137[1] version 1.0-rel0-rc1.

[1] https://developer.arm.com/-/cdn-downloads/permalink/PDF/Architectures/DEN0137_1.0-rel0-rc1_rmm-arch_external.pdf

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
Changes since v4:
 * Update to match the latest RMM spec version 1.0-rel0-rc1.
 * Make use of the ARM_SMCCC_CALL_VAL macro.
 * Cast using (_UL macro) various values to unsigned long.
Changes since v3:
 * Drop invoke_rsi_fn_smc_with_res() function and call arm_smccc_smc()
   directly instead.
 * Rename header guard in rsi_smc.h to be consistent.
Changes since v2:
 * Rename rsi_get_version() to rsi_request_version()
 * Fix size/alignment of struct realm_config
---
 arch/arm64/include/asm/rsi_cmds.h | 136 +++++++++++++++++++++
 arch/arm64/include/asm/rsi_smc.h  | 189 ++++++++++++++++++++++++++++++
 2 files changed, 325 insertions(+)
 create mode 100644 arch/arm64/include/asm/rsi_cmds.h
 create mode 100644 arch/arm64/include/asm/rsi_smc.h

Comments

Catalin Marinas Aug. 26, 2024, 10:01 a.m. UTC | #1
On Mon, Aug 19, 2024 at 02:19:08PM +0100, Steven Price wrote:
> From: Suzuki K Poulose <suzuki.poulose@arm.com>
> 
> The RMM (Realm Management Monitor) provides functionality that can be
> accessed by a realm guest through SMC (Realm Services Interface) calls.
> 
> The SMC definitions are based on DEN0137[1] version 1.0-rel0-rc1.
> 
> [1] https://developer.arm.com/-/cdn-downloads/permalink/PDF/Architectures/DEN0137_1.0-rel0-rc1_rmm-arch_external.pdf
> 
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> Signed-off-by: Steven Price <steven.price@arm.com>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

(I did cross-check the definitions with the spec)

> +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);

It might have been easier to just write the pad sizes in decimal (trying
to figure out what 0xe00 is ;)). Anyway, it's fine like this as well.
Gavin Shan Sept. 9, 2024, 5:10 a.m. UTC | #2
On 8/19/24 11:19 PM, Steven Price wrote:
> From: Suzuki K Poulose <suzuki.poulose@arm.com>
> 
> The RMM (Realm Management Monitor) provides functionality that can be
> accessed by a realm guest through SMC (Realm Services Interface) calls.
> 
> The SMC definitions are based on DEN0137[1] version 1.0-rel0-rc1.
> 
> [1] https://developer.arm.com/-/cdn-downloads/permalink/PDF/Architectures/DEN0137_1.0-rel0-rc1_rmm-arch_external.pdf
> 
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
> Changes since v4:
>   * Update to match the latest RMM spec version 1.0-rel0-rc1.
>   * Make use of the ARM_SMCCC_CALL_VAL macro.
>   * Cast using (_UL macro) various values to unsigned long.
> Changes since v3:
>   * Drop invoke_rsi_fn_smc_with_res() function and call arm_smccc_smc()
>     directly instead.
>   * Rename header guard in rsi_smc.h to be consistent.
> Changes since v2:
>   * Rename rsi_get_version() to rsi_request_version()
>   * Fix size/alignment of struct realm_config
> ---
>   arch/arm64/include/asm/rsi_cmds.h | 136 +++++++++++++++++++++
>   arch/arm64/include/asm/rsi_smc.h  | 189 ++++++++++++++++++++++++++++++
>   2 files changed, 325 insertions(+)
>   create mode 100644 arch/arm64/include/asm/rsi_cmds.h
>   create mode 100644 arch/arm64/include/asm/rsi_smc.h
> 

With the following minor comments addressed:

Reviewed-by: Gavin Shan <gshan@redht.com>

> diff --git a/arch/arm64/include/asm/rsi_cmds.h b/arch/arm64/include/asm/rsi_cmds.h
> new file mode 100644
> index 000000000000..968b03f4e703
> --- /dev/null
> +++ b/arch/arm64/include/asm/rsi_cmds.h
> @@ -0,0 +1,136 @@
> +/* 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_IO = 3,
> +};
> +

The 'RSI_RIPAS_IO' corresponds to 'RIPAS_DEV' defined in tf-rmm/lib/s2tt/include/ripas.h.
Shall we rename it to RSI_RIPAS_DEV so that the name is matched with that defined in
tf-rmm?

---> tf-rmm/lib/s2tt/include/ripas.h

/*
  * The RmmRipas enumeration represents realm IPA state.
  *
  * Map RmmRipas to RmiRipas to simplify code/decode operations.
  */
enum ripas {
         RIPAS_EMPTY = RMI_EMPTY,        /* Unused IPA for Realm */
         RIPAS_RAM = RMI_RAM,            /* IPA used for Code/Data by Realm */
         RIPAS_DESTROYED = RMI_DESTROYED,/* IPA is inaccessible to the Realm */
         RIPAS_DEV                       /* Address where memory of an assigned
                                            Realm device is mapped */
};

> +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 unsigned 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;
> +
> +	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 unsigned 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;
> +}
> +

The type of the return value would be 'long' instead of 'unsigned long' since
'-EINVAL' can be returned.

> +/**
> + * 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 int 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 */
> diff --git a/arch/arm64/include/asm/rsi_smc.h b/arch/arm64/include/asm/rsi_smc.h
> new file mode 100644
> index 000000000000..b76b03a8fea8
> --- /dev/null
> +++ b/arch/arm64/include/asm/rsi_smc.h
> @@ -0,0 +1,189 @@
> +/* 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
               ^^^^^^^^^^^^^
               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:  7 - 15
                                          ^^^^^^
                                          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:  7 - 15
                                           ^^^^^^
                                           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:  7 - 15
                                        ^^^^^^
                                        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
> + */
> +#define SMC_RSI_IPA_STATE_SET			SMC_RSI_FID(0x197)
> +
> +#define RSI_NO_CHANGE_DESTROYED			UL(0)
> +#define RSI_CHANGE_DESTROYED			UL(1)
> +

According to the linked specification, the description for the third return value
has been missed here.

ret2 == Whether the host accepted or rejected the request

> +/*
> + * 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_ */

Thanks,
Gavin
Steven Price Sept. 9, 2024, 9:12 a.m. UTC | #3
On 09/09/2024 06:10, Gavin Shan wrote:
> On 8/19/24 11:19 PM, Steven Price wrote:
>> From: Suzuki K Poulose <suzuki.poulose@arm.com>
>>
>> The RMM (Realm Management Monitor) provides functionality that can be
>> accessed by a realm guest through SMC (Realm Services Interface) calls.
>>
>> The SMC definitions are based on DEN0137[1] version 1.0-rel0-rc1.
>>
>> [1]
>> https://developer.arm.com/-/cdn-downloads/permalink/PDF/Architectures/DEN0137_1.0-rel0-rc1_rmm-arch_external.pdf
>>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> Signed-off-by: Steven Price <steven.price@arm.com>
>> ---
>> Changes since v4:
>>   * Update to match the latest RMM spec version 1.0-rel0-rc1.
>>   * Make use of the ARM_SMCCC_CALL_VAL macro.
>>   * Cast using (_UL macro) various values to unsigned long.
>> Changes since v3:
>>   * Drop invoke_rsi_fn_smc_with_res() function and call arm_smccc_smc()
>>     directly instead.
>>   * Rename header guard in rsi_smc.h to be consistent.
>> Changes since v2:
>>   * Rename rsi_get_version() to rsi_request_version()
>>   * Fix size/alignment of struct realm_config
>> ---
>>   arch/arm64/include/asm/rsi_cmds.h | 136 +++++++++++++++++++++
>>   arch/arm64/include/asm/rsi_smc.h  | 189 ++++++++++++++++++++++++++++++
>>   2 files changed, 325 insertions(+)
>>   create mode 100644 arch/arm64/include/asm/rsi_cmds.h
>>   create mode 100644 arch/arm64/include/asm/rsi_smc.h
>>
> 
> With the following minor comments addressed:
> 
> Reviewed-by: Gavin Shan <gshan@redht.com>

Thanks for the review!

>> diff --git a/arch/arm64/include/asm/rsi_cmds.h
>> b/arch/arm64/include/asm/rsi_cmds.h
>> new file mode 100644
>> index 000000000000..968b03f4e703
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/rsi_cmds.h
>> @@ -0,0 +1,136 @@
>> +/* 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_IO = 3,
>> +};
>> +
> 
> The 'RSI_RIPAS_IO' corresponds to 'RIPAS_DEV' defined in
> tf-rmm/lib/s2tt/include/ripas.h.
> Shall we rename it to RSI_RIPAS_DEV so that the name is matched with
> that defined in
> tf-rmm?

Yes it should be renamed. This was posted based on the v1.0-rel0-rc1
spec and follows the naming there. But shortly after that spec was
released the decision to rename to RIPAS_DEV was made (as it's really
specifying that it's a device not that I/O is happening at an address).
I kept the naming to match the spec, but the next release of the spec
should have the RIPAS_DEV so I'll update to match that.

> ---> tf-rmm/lib/s2tt/include/ripas.h
> 
> /*
>  * The RmmRipas enumeration represents realm IPA state.
>  *
>  * Map RmmRipas to RmiRipas to simplify code/decode operations.
>  */
> enum ripas {
>         RIPAS_EMPTY = RMI_EMPTY,        /* Unused IPA for Realm */
>         RIPAS_RAM = RMI_RAM,            /* IPA used for Code/Data by
> Realm */
>         RIPAS_DESTROYED = RMI_DESTROYED,/* IPA is inaccessible to the
> Realm */
>         RIPAS_DEV                       /* Address where memory of an
> assigned
>                                            Realm device is mapped */
> };
> 
>> +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 unsigned 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;
>> +
>> +    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 unsigned 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;
>> +}
>> +
> 
> The type of the return value would be 'long' instead of 'unsigned long'
> since
> '-EINVAL' can be returned.

Good spot! The call site is casting back to long, so it "should work",
but clearly this is the wrong type.

>> +/**
>> + * 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 int 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 */
>> diff --git a/arch/arm64/include/asm/rsi_smc.h
>> b/arch/arm64/include/asm/rsi_smc.h
>> new file mode 100644
>> index 000000000000..b76b03a8fea8
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/rsi_smc.h
>> @@ -0,0 +1,189 @@
>> +/* 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
>               ^^^^^^^^^^^^^
>               Status / error

Ack

>> + * 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:  7 - 15
>                                          ^^^^^^
>                                          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:  7 - 15
>                                           ^^^^^^
>                                           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:  7 - 15
>                                        ^^^^^^
>                                        8 - 15

One mistake and too much copy/pasting :(

>> + * 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
>> + */
>> +#define SMC_RSI_IPA_STATE_SET            SMC_RSI_FID(0x197)
>> +
>> +#define RSI_NO_CHANGE_DESTROYED            UL(0)
>> +#define RSI_CHANGE_DESTROYED            UL(1)
>> +
> 
> According to the linked specification, the description for the third
> return value
> has been missed here.
> 
> ret2 == Whether the host accepted or rejected the request

Worse than just a documentation error - I'd completely forgotten to
check this extra return value in rsi_set_addr_range_state(). Thanks for
spotting this!

Steve

>> +/*
>> + * 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_ */
> 
> Thanks,
> Gavin
>
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/rsi_cmds.h b/arch/arm64/include/asm/rsi_cmds.h
new file mode 100644
index 000000000000..968b03f4e703
--- /dev/null
+++ b/arch/arm64/include/asm/rsi_cmds.h
@@ -0,0 +1,136 @@ 
+/* 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_IO = 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 unsigned 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;
+
+	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 unsigned 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 int 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 */
diff --git a/arch/arm64/include/asm/rsi_smc.h b/arch/arm64/include/asm/rsi_smc.h
new file mode 100644
index 000000000000..b76b03a8fea8
--- /dev/null
+++ b/arch/arm64/include/asm/rsi_smc.h
@@ -0,0 +1,189 @@ 
+/* 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:  7 - 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:  7 - 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:  7 - 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
+ */
+#define SMC_RSI_IPA_STATE_SET			SMC_RSI_FID(0x197)
+
+#define RSI_NO_CHANGE_DESTROYED			UL(0)
+#define RSI_CHANGE_DESTROYED			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_ */