On Fri, May 9, 2025, at 05:15, Andrew Ballance wrote:
> +
> +#define define_rust_pio_read_helper(name, type) \
> + type rust_helper_##name(unsigned long port) \
> + { \
> + return name(port); \
> + }
> +
> +#define define_rust_pio_write_helper(name, type) \
> + void rust_helper_##name(type value, unsigned long port) \
> + { \
> + name(value, port); \
> + }
> +
> +define_rust_pio_read_helper(inb, u8);
> +define_rust_pio_read_helper(inw, u16);
> +define_rust_pio_read_helper(inl, u32);
> +
> +define_rust_pio_write_helper(outb, u8);
> +define_rust_pio_write_helper(outw, u16);
> +define_rust_pio_write_helper(outl, u32);
These have to be guarded with "#ifdef CONFIG_HAS_PIO", since
most modern machines no longer support PIO at all, even behind
PCI.
The option is still enabled by default for a number of
architectures that normally don't have PIO, but it should
eventually become optional on pretty much anything but
x86 and a few 1990s-era workstations that implement x86-style
on-board devices.
Arnd
