[RFC PATCH 02/14] arm64: rsi: Add RSI definitions

Steven Price
2023-01-27T11:29:47Z

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 A-bet0.

[1] https://developer.arm.com/documentation/den0137/latest

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/arm64/include/asm/rsi_cmds.h | 57 +++++++++++++
arch/arm64/include/asm/rsi_smc.h | 130 ++++++++++++++++++++++++++++++
2 files changed, 187 insertions(+)
create mode 100644 arch/arm64/include/asm/rsi_cmds.h
create mode 100644 arch/arm64/include/asm/rsi_smc.h

diff --git a/arch/arm64/include/asm/rsi_cmds.h b/arch/arm64/include/asm/rsi_cmds.h
new file mode 100644
index 000000000000..a0b3c1bd786a
--- /dev/null
+++ b/arch/arm64/include/asm/rsi_cmds.h
@@ -0,0 +1,57 @@
+/* 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>
+
+enum ripas {
+ RSI_RIPAS_EMPTY,
+ RSI_RIPAS_RAM,
+};
+
+static inline unsigned long rsi_get_version(void)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(SMC_RSI_ABI_VERSION, 0, 0, 0, 0, 0, 0, 0, &res);
+
+ return res.a0;
+}
+
+static inline unsigned long invoke_rsi_fn_smc(unsigned long function_id,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, 0, 0, 0, &res);
+ return res.a0;
+}
+
+static inline void invoke_rsi_fn_smc_with_res(unsigned long function_id,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ struct arm_smccc_res *res)
+{
+ arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, 0, 0, 0, res);
+}
+
+static inline unsigned long rsi_set_addr_range_state(phys_addr_t start,
+ phys_addr_t end,
+ enum ripas state)
+{
+ return invoke_rsi_fn_smc(SMC_RSI_IPA_STATE_SET,
+ start, (end - start), state, 0);
+}
+
+#endif
diff --git a/arch/arm64/include/asm/rsi_smc.h b/arch/arm64/include/asm/rsi_smc.h
new file mode 100644
index 000000000000..bc0cdd83f164
--- /dev/null
+++ b/arch/arm64/include/asm/rsi_smc.h
@@ -0,0 +1,130 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2023 ARM Ltd.
+ */
+
+#ifndef __SMC_RSI_H_
+#define __SMC_RSI_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.
+ */
+
+#define SMC_RSI_CALL_BASE 0xC4000000
+
+/*
+ * The major version number of the RSI implementation. Increase this whenever
+ * the binary format or semantics of the SMC calls change.
+ */
+#define RSI_ABI_VERSION_MAJOR 1
+
+/*
+ * The minor version number of the RSI implementation. Increase this when
+ * a bug is fixed, or a feature is added without breaking binary compatibility.
+ */
+#define RSI_ABI_VERSION_MINOR 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 0
+#define RSI_ERROR_INPUT 1
+#define RSI_ERROR_STATE 2
+#define RSI_INCOMPLETE 3
+
+#define SMC_RSI_FID(_x) (SMC_RSI_CALL_BASE + (_x))
+
+#define SMC_RSI_ABI_VERSION SMC_RSI_FID(0x190)
+
+/*
+ * arg1 == The IPA of token buffer
+ * arg2 == Challenge value, bytes: 0 - 7
+ * arg3 == Challenge value, bytes: 7 - 15
+ * arg4 == Challenge value, bytes: 16 - 23
+ * arg5 == Challenge value, bytes: 24 - 31
+ * arg6 == Challenge value, bytes: 32 - 39
+ * arg7 == Challenge value, bytes: 40 - 47
+ * arg8 == Challenge value, bytes: 48 - 55
+ * arg9 == Challenge value, bytes: 56 - 63
+ * ret0 == Status / error
+ */
+#define SMC_RSI_ATTESTATION_TOKEN_INIT SMC_RSI_FID(0x194)
+
+/*
+ * arg1 == The IPA of token buffer
+ * ret0 == Status / error
+ * ret1 == Size of completed token in bytes
+ */
+#define SMC_RSI_ATTESTATION_TOKEN_CONTINUE SMC_RSI_FID(0x195)
+
+/*
+ * 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)
+
+/*
+ * 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)
+
+#ifndef __ASSEMBLY__
+
+struct realm_config {
+ unsigned long ipa_bits; /* Width of IPA in bits */
+};
+
+#endif /* __ASSEMBLY__ */
+
+/*
+ * arg1 == struct realm_config addr
+ * ret0 == Status / error
+ */
+#define SMC_RSI_REALM_CONFIG SMC_RSI_FID(0x196)
+
+/*
+ * arg1 == IPA address of target region
+ * arg2 == size of target region in bytes
+ * arg3 == RIPAS value
+ * ret0 == Status / error
+ * ret1 == Top of modified IPA range
+ */
+#define SMC_RSI_IPA_STATE_SET SMC_RSI_FID(0x197)
+
+/*
+ * arg1 == IPA of target page
+ * ret0 == Status / error
+ * ret1 == RIPAS value
+ */
+#define SMC_RSI_IPA_STATE_GET SMC_RSI_FID(0x198)
+
+/*
+ * arg1 == IPA of host call structure
+ * ret0 == Status / error
+ */
+#define SMC_RSI_HOST_CALL SMC_RSI_FID(0x199)
+
+#endif /* __SMC_RSI_H_ */
--
2.34.1