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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
This commit is contained in:
Kirill A. Shutemov
Dave Hansen
parent
15104de122
commit
1e8f93e183
4 changed files with 38 additions and 55 deletions
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@ -23,6 +23,7 @@
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#include <linux/edd.h>
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#include <asm/setup.h>
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#include <asm/asm.h>
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#include <asm/shared/io.h>
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#include "bitops.h"
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#include "ctype.h"
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#include "cpuflags.h"
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@ -35,40 +36,6 @@ extern struct boot_params boot_params;
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#define cpu_relax() asm volatile("rep; nop")
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/* Basic port I/O */
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static inline void outb(u8 v, u16 port)
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{
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asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
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}
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static inline u8 inb(u16 port)
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{
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u8 v;
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asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
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return v;
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}
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static inline void outw(u16 v, u16 port)
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{
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asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
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}
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static inline u16 inw(u16 port)
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{
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u16 v;
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asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
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return v;
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}
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static inline void outl(u32 v, u16 port)
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{
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asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
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}
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static inline u32 inl(u16 port)
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{
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u32 v;
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asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
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return v;
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}
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static inline void io_delay(void)
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{
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const u16 DELAY_PORT = 0x80;
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@ -22,11 +22,11 @@
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#include <linux/linkage.h>
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#include <linux/screen_info.h>
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#include <linux/elf.h>
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#include <linux/io.h>
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#include <asm/page.h>
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#include <asm/boot.h>
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#include <asm/bootparam.h>
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#include <asm/desc_defs.h>
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#include <asm/shared/io.h>
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#include "tdx.h"
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@ -44,6 +44,7 @@
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#include <asm/page.h>
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#include <asm/early_ioremap.h>
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#include <asm/pgtable_types.h>
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#include <asm/shared/io.h>
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#define build_mmio_read(name, size, type, reg, barrier) \
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static inline type name(const volatile void __iomem *addr) \
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@ -258,20 +259,6 @@ static inline void slow_down_io(void)
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#endif
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#define BUILDIO(bwl, bw, type) \
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static inline void out##bwl(type value, u16 port) \
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{ \
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asm volatile("out" #bwl " %" #bw "0, %w1" \
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: : "a"(value), "Nd"(port)); \
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} \
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\
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static inline type in##bwl(u16 port) \
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{ \
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type value; \
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asm volatile("in" #bwl " %w1, %" #bw "0" \
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: "=a"(value) : "Nd"(port)); \
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return value; \
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} \
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\
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static inline void out##bwl##_p(type value, u16 port) \
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{ \
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out##bwl(value, port); \
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@ -320,10 +307,8 @@ static inline void ins##bwl(u16 port, void *addr, unsigned long count) \
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BUILDIO(b, b, u8)
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BUILDIO(w, w, u16)
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BUILDIO(l, , u32)
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#undef BUILDIO
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#define inb inb
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#define inw inw
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#define inl inl
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#define inb_p inb_p
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#define inw_p inw_p
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#define inl_p inl_p
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@ -331,9 +316,6 @@ BUILDIO(l, , u32)
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#define insw insw
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#define insl insl
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#define outb outb
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#define outw outw
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#define outl outl
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#define outb_p outb_p
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#define outw_p outw_p
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#define outl_p outl_p
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34
arch/x86/include/asm/shared/io.h
Normal file
34
arch/x86/include/asm/shared/io.h
Normal file
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@ -0,0 +1,34 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SHARED_IO_H
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#define _ASM_X86_SHARED_IO_H
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#include <linux/types.h>
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#define BUILDIO(bwl, bw, type) \
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static inline void __out##bwl(type value, u16 port) \
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{ \
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asm volatile("out" #bwl " %" #bw "0, %w1" \
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: : "a"(value), "Nd"(port)); \
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} \
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\
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static inline type __in##bwl(u16 port) \
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{ \
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type value; \
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asm volatile("in" #bwl " %w1, %" #bw "0" \
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: "=a"(value) : "Nd"(port)); \
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return value; \
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}
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BUILDIO(b, b, u8)
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BUILDIO(w, w, u16)
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BUILDIO(l, , u32)
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#undef BUILDIO
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#define inb __inb
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#define inw __inw
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#define inl __inl
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#define outb __outb
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#define outw __outw
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#define outl __outl
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#endif
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