tdcall.S (5efb96289e581c187af1bc288ce5d26ed6181749) tdcall.S (57a420bb8186d1d0178b857e5dd5026093641654)
1/* SPDX-License-Identifier: GPL-2.0 */
2#include <asm/asm-offsets.h>
3#include <asm/asm.h>
4#include <asm/frame.h>
5#include <asm/unwind_hints.h>
6
7#include <linux/linkage.h>
8#include <linux/bits.h>

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38 TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15 )
39
40.section .noinstr.text, "ax"
41
42/*
43 * __tdcall() - Used by TDX guests to request services from the TDX
44 * module (does not include VMM services) using TDCALL instruction.
45 *
1/* SPDX-License-Identifier: GPL-2.0 */
2#include <asm/asm-offsets.h>
3#include <asm/asm.h>
4#include <asm/frame.h>
5#include <asm/unwind_hints.h>
6
7#include <linux/linkage.h>
8#include <linux/bits.h>

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38 TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15 )
39
40.section .noinstr.text, "ax"
41
42/*
43 * __tdcall() - Used by TDX guests to request services from the TDX
44 * module (does not include VMM services) using TDCALL instruction.
45 *
46 * Transforms function call register arguments into the TDCALL register ABI.
47 * After TDCALL operation, TDX module output is saved in @out (if it is
48 * provided by the user).
49 *
50 *-------------------------------------------------------------------------
51 * TDCALL ABI:
52 *-------------------------------------------------------------------------
53 * Input Registers:
54 *
55 * RAX - TDCALL Leaf number.
56 * RCX,RDX,R8-R9 - TDCALL Leaf specific input registers.
57 *
58 * Output Registers:
59 *
60 * RAX - TDCALL instruction error code.
61 * RCX,RDX,R8-R11 - TDCALL Leaf specific output registers.
62 *
63 *-------------------------------------------------------------------------
64 *
65 * __tdcall() function ABI:
66 *
46 * __tdcall() function ABI:
47 *
67 * @fn (RDI) - TDCALL Leaf ID, moved to RAX
68 * @rcx (RSI) - Input parameter 1, moved to RCX
69 * @rdx (RDX) - Input parameter 2, moved to RDX
70 * @r8 (RCX) - Input parameter 3, moved to R8
71 * @r9 (R8) - Input parameter 4, moved to R9
48 * @fn (RDI) - TDCALL Leaf ID, moved to RAX
49 * @args (RSI) - struct tdx_module_args for input
72 *
50 *
73 * @out (R9) - struct tdx_module_output pointer
74 * stored temporarily in R12 (not
75 * shared with the TDX module). It
76 * can be NULL.
77 *
78 * Return status of TDCALL via RAX.
79 */
80SYM_FUNC_START(__tdcall)
81 TDX_MODULE_CALL host=0
82SYM_FUNC_END(__tdcall)
83
84/*
51 * Return status of TDCALL via RAX.
52 */
53SYM_FUNC_START(__tdcall)
54 TDX_MODULE_CALL host=0
55SYM_FUNC_END(__tdcall)
56
57/*
58 * __tdcall_ret() - Used by TDX guests to request services from the TDX
59 * module (does not include VMM services) using TDCALL instruction, with
60 * saving output registers to the 'struct tdx_module_args' used as input.
61 *
62 * __tdcall_ret() function ABI:
63 *
64 * @fn (RDI) - TDCALL Leaf ID, moved to RAX
65 * @args (RSI) - struct tdx_module_args for input and output
66 *
67 * Return status of TDCALL via RAX.
68 */
69SYM_FUNC_START(__tdcall_ret)
70 TDX_MODULE_CALL host=0 ret=1
71SYM_FUNC_END(__tdcall_ret)
72
73/*
85 * TDX_HYPERCALL - Make hypercalls to a TDX VMM using TDVMCALL leaf of TDCALL
86 * instruction
87 *
88 * Transforms values in function call argument struct tdx_hypercall_args @args
89 * into the TDCALL register ABI. After TDCALL operation, VMM output is saved
90 * back in @args, if \ret is 1.
91 *
92 *-------------------------------------------------------------------------

--- 145 unchanged lines hidden --- 		74 * TDX_HYPERCALL - Make hypercalls to a TDX VMM using TDVMCALL leaf of TDCALL
75 * instruction
76 *
77 * Transforms values in function call argument struct tdx_hypercall_args @args
78 * into the TDCALL register ABI. After TDCALL operation, VMM output is saved
79 * back in @args, if \ret is 1.
80 *
81 *-------------------------------------------------------------------------

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