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
14 struct 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
20 extern 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 */
26 static 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
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