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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2022-04-06 02:29:23 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2022-04-07 08:27:52 -0700 |
| commit | 1e8f93e18379d05da9fd130eb7d50988a20f8b9a (patch) | |
| tree | 12c5cc4f59c0b0e414612e494ac9e016442442ca /arch/x86/include/asm/shared | |
| parent | 15104de122a4f0258981b06ed94cf616a6eb03ef (diff) | |
| download | lwn-1e8f93e18379d05da9fd130eb7d50988a20f8b9a.tar.gz lwn-1e8f93e18379d05da9fd130eb7d50988a20f8b9a.zip | |
x86: Consolidate port I/O helpers
There are two implementations of port I/O helpers: one in the kernel and
one in the boot stub.
Move the helpers required for both to <asm/shared/io.h> and use the one
implementation everywhere.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20220405232939.73860-15-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/include/asm/shared')
| -rw-r--r-- | arch/x86/include/asm/shared/io.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/x86/include/asm/shared/io.h b/arch/x86/include/asm/shared/io.h new file mode 100644 index 000000000000..c0ef921c0586 --- /dev/null +++ b/arch/x86/include/asm/shared/io.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_SHARED_IO_H +#define _ASM_X86_SHARED_IO_H + +#include <linux/types.h> + +#define BUILDIO(bwl, bw, type) \ +static inline void __out##bwl(type value, u16 port) \ +{ \ + asm volatile("out" #bwl " %" #bw "0, %w1" \ + : : "a"(value), "Nd"(port)); \ +} \ + \ +static inline type __in##bwl(u16 port) \ +{ \ + type value; \ + asm volatile("in" #bwl " %w1, %" #bw "0" \ + : "=a"(value) : "Nd"(port)); \ + return value; \ +} + +BUILDIO(b, b, u8) +BUILDIO(w, w, u16) +BUILDIO(l, , u32) +#undef BUILDIO + +#define inb __inb +#define inw __inw +#define inl __inl +#define outb __outb +#define outw __outw +#define outl __outl + +#endif |