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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef BOOT_IO_H
- #define BOOT_IO_H
- #include <asm/shared/io.h>
- #undef inb
- #undef inw
- #undef inl
- #undef outb
- #undef outw
- #undef outl
- struct port_io_ops {
- u8 (*f_inb)(u16 port);
- void (*f_outb)(u8 v, u16 port);
- void (*f_outw)(u16 v, u16 port);
- };
- extern struct port_io_ops pio_ops;
- /*
- * Use the normal I/O instructions by default.
- * TDX guests override these to use hypercalls.
- */
- static inline void init_default_io_ops(void)
- {
- pio_ops.f_inb = __inb;
- pio_ops.f_outb = __outb;
- pio_ops.f_outw = __outw;
- }
- /*
- * Redirect port I/O operations via pio_ops callbacks.
- * TDX guests override these callbacks with TDX-specific helpers.
- */
- #define inb pio_ops.f_inb
- #define outb pio_ops.f_outb
- #define outw pio_ops.f_outw
- #endif
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