161 lines
3.9 KiB
C
161 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2023 ARM Ltd.
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*/
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#ifndef __ASM_RSI_CMDS_H
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#define __ASM_RSI_CMDS_H
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#include <linux/arm-smccc.h>
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#include <asm/rsi_smc.h>
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#define RSI_GRANULE_SHIFT 12
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#define RSI_GRANULE_SIZE (_AC(1, UL) << RSI_GRANULE_SHIFT)
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enum ripas {
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RSI_RIPAS_EMPTY = 0,
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RSI_RIPAS_RAM = 1,
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RSI_RIPAS_DESTROYED = 2,
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RSI_RIPAS_DEV = 3,
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};
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static inline unsigned long rsi_request_version(unsigned long req,
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unsigned long *out_lower,
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unsigned long *out_higher)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(SMC_RSI_ABI_VERSION, req, 0, 0, 0, 0, 0, 0, &res);
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if (out_lower)
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*out_lower = res.a1;
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if (out_higher)
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*out_higher = res.a2;
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return res.a0;
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}
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static inline unsigned long rsi_get_realm_config(struct realm_config *cfg)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(SMC_RSI_REALM_CONFIG, virt_to_phys(cfg),
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0, 0, 0, 0, 0, 0, &res);
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return res.a0;
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}
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static inline unsigned long rsi_ipa_state_get(phys_addr_t start,
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phys_addr_t end,
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enum ripas *state,
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phys_addr_t *top)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(SMC_RSI_IPA_STATE_GET,
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start, end, 0, 0, 0, 0, 0,
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&res);
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if (res.a0 == RSI_SUCCESS) {
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if (top)
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*top = res.a1;
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if (state)
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*state = res.a2;
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}
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return res.a0;
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}
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static inline long rsi_set_addr_range_state(phys_addr_t start,
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phys_addr_t end,
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enum ripas state,
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unsigned long flags,
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phys_addr_t *top)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(SMC_RSI_IPA_STATE_SET, start, end, state,
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flags, 0, 0, 0, &res);
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if (top)
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*top = res.a1;
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if (res.a2 != RSI_ACCEPT)
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return -EPERM;
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return res.a0;
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}
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/**
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* rsi_attestation_token_init - Initialise the operation to retrieve an
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* attestation token.
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*
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* @challenge: The challenge data to be used in the attestation token
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* generation.
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* @size: Size of the challenge data in bytes.
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*
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* Initialises the attestation token generation and returns an upper bound
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* on the attestation token size that can be used to allocate an adequate
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* buffer. The caller is expected to subsequently call
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* rsi_attestation_token_continue() to retrieve the attestation token data on
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* the same CPU.
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*
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* Returns:
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* On success, returns the upper limit of the attestation report size.
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* Otherwise, -EINVAL
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*/
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static inline long
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rsi_attestation_token_init(const u8 *challenge, unsigned long size)
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{
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struct arm_smccc_1_2_regs regs = { 0 };
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/* The challenge must be at least 32bytes and at most 64bytes */
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if (!challenge || size < 32 || size > 64)
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return -EINVAL;
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regs.a0 = SMC_RSI_ATTESTATION_TOKEN_INIT;
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memcpy(®s.a1, challenge, size);
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arm_smccc_1_2_smc(®s, ®s);
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if (regs.a0 == RSI_SUCCESS)
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return regs.a1;
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return -EINVAL;
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}
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/**
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* rsi_attestation_token_continue - Continue the operation to retrieve an
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* attestation token.
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*
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* @granule: {I}PA of the Granule to which the token will be written.
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* @offset: Offset within Granule to start of buffer in bytes.
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* @size: The size of the buffer.
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* @len: The number of bytes written to the buffer.
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*
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* Retrieves up to a RSI_GRANULE_SIZE worth of token data per call. The caller
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* is expected to call rsi_attestation_token_init() before calling this
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* function to retrieve the attestation token.
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*
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* Return:
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* * %RSI_SUCCESS - Attestation token retrieved successfully.
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* * %RSI_INCOMPLETE - Token generation is not complete.
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* * %RSI_ERROR_INPUT - A parameter was not valid.
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* * %RSI_ERROR_STATE - Attestation not in progress.
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*/
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static inline unsigned long rsi_attestation_token_continue(phys_addr_t granule,
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unsigned long offset,
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unsigned long size,
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unsigned long *len)
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{
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struct arm_smccc_res res;
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arm_smccc_1_1_invoke(SMC_RSI_ATTESTATION_TOKEN_CONTINUE,
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granule, offset, size, 0, &res);
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if (len)
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*len = res.a1;
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return res.a0;
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}
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#endif /* __ASM_RSI_CMDS_H */
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