arch/x86/coco/tdx/tdcall.S

Source file repositories/reference/linux-study-clean/arch/x86/coco/tdx/tdcall.S

File Facts

System
Linux kernel
Corpus path
arch/x86/coco/tdx/tdcall.S
Extension
.S
Size
1822 bytes
Lines
64
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: arch/x86
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#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)

Annotation

Implementation Notes