1 files changed, 63 insertions, 0 deletions
diff --git a/arch/x86/coco/tdx/tdcall.S b/arch/x86/coco/tdx/tdcall.S
new file mode 100644
index 000000000000..52d9786da308
--- /dev/null
+++ b/arch/x86/coco/tdx/tdcall.S
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <asm/asm-offsets.h>
+#include <asm/asm.h>
+
+#include <linux/linkage.h>
+#include <linux/errno.h>
+
+#include "../../virt/vmx/tdx/tdxcall.S"
+
+.section .noinstr.text, "ax"
+
+/*
+ * __tdcall()  - Used by TDX guests to request services from the TDX
+ * module (does not include VMM services) using TDCALL instruction.
+ *
+ * __tdcall() function ABI:
+ *
+ * @fn   (RDI)	- TDCALL Leaf ID, moved to RAX
+ * @args (RSI)	- struct tdx_module_args for input
+ *
+ * Only RCX/RDX/R8-R11 are used as input registers.
+ *
+ * Return status of TDCALL via RAX.
+ */
+SYM_FUNC_START(__tdcall)
+	TDX_MODULE_CALL host=0
+SYM_FUNC_END(__tdcall)
+
+/*
+ * __tdcall_ret() - Used by TDX guests to request services from the TDX
+ * module (does not include VMM services) using TDCALL instruction, with
+ * saving output registers to the 'struct tdx_module_args' used as input.
+ *
+ * __tdcall_ret() function ABI:
+ *
+ * @fn   (RDI)	- TDCALL Leaf ID, moved to RAX
+ * @args (RSI)	- struct tdx_module_args for input and output
+ *
+ * Only RCX/RDX/R8-R11 are used as input/output registers.
+ *
+ * Return status of TDCALL via RAX.
+ */
+SYM_FUNC_START(__tdcall_ret)
+	TDX_MODULE_CALL host=0 ret=1
+SYM_FUNC_END(__tdcall_ret)
+
+/*
+ * __tdcall_saved_ret() - Used by TDX guests to request services from the
+ * TDX module (including VMM services) using TDCALL instruction, with
+ * saving output registers to the 'struct tdx_module_args' used as input.
+ *
+ * __tdcall_saved_ret() function ABI:
+ *
+ * @fn   (RDI)	- TDCALL leaf ID, moved to RAX
+ * @args (RSI)	- struct tdx_module_args for input/output
+ *
+ * All registers in @args are used as input/output registers.
+ *
+ * On successful completion, return the hypercall error code.
+ */
+SYM_FUNC_START(__tdcall_saved_ret)
+	TDX_MODULE_CALL host=0 ret=1 saved=1
+SYM_FUNC_END(__tdcall_saved_ret)