1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef BOOT_IO_H
3#define BOOT_IO_H
4
5#include <asm/shared/io.h>
6
7#undef inb
8#undef inw
9#undef inl
10#undef outb
11#undef outw
12#undef outl
13
14struct port_io_ops {
15	u8	(*f_inb)(u16 port);
16	void	(*f_outb)(u8 v, u16 port);
17	void	(*f_outw)(u16 v, u16 port);
18};
19
20extern struct port_io_ops pio_ops;
21
22/*
23 * Use the normal I/O instructions by default.
24 * TDX guests override these to use hypercalls.
25 */
26static inline void init_default_io_ops(void)
27{
28	pio_ops.f_inb  = __inb;
29	pio_ops.f_outb = __outb;
30	pio_ops.f_outw = __outw;
31}
32
33/*
34 * Redirect port I/O operations via pio_ops callbacks.
35 * TDX guests override these callbacks with TDX-specific helpers.
36 */
37#define inb  pio_ops.f_inb
38#define outb pio_ops.f_outb
39#define outw pio_ops.f_outw
40
41#endif
42