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Subject[tip:x86/asm] x86/io: Define IO accessors by preprocessor
Commit-ID:  80b9ece1339374444f08da46fa2383019fcf4374
Author: Andy Shevchenko <>
AuthorDate: Fri, 30 Jun 2017 20:09:30 +0300
Committer: Ingo Molnar <>
CommitDate: Mon, 24 Jul 2017 11:18:20 +0200

x86/io: Define IO accessors by preprocessor

As a preparatory to use generic IO accessor helpers we need to define
architecture dependent functions via preprocessor to let world know we
have them.

Signed-off-by: Andy Shevchenko <>
Acked-by: Wolfram Sang <>
Cc: Baolin Wang <>
Cc: Linus Torvalds <>
Cc: Mika Westerberg <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Signed-off-by: Ingo Molnar <>
arch/x86/include/asm/io.h | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 7afb0e2..c1c0880 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -69,6 +69,9 @@ build_mmio_write(__writeb, "b", unsigned char, "q", )
build_mmio_write(__writew, "w", unsigned short, "r", )
build_mmio_write(__writel, "l", unsigned int, "r", )

+#define readb readb
+#define readw readw
+#define readl readl
#define readb_relaxed(a) __readb(a)
#define readw_relaxed(a) __readw(a)
#define readl_relaxed(a) __readl(a)
@@ -76,6 +79,9 @@ build_mmio_write(__writel, "l", unsigned int, "r", )
#define __raw_readw __readw
#define __raw_readl __readl

+#define writeb writeb
+#define writew writew
+#define writel writel
#define writeb_relaxed(v, a) __writeb(v, a)
#define writew_relaxed(v, a) __writew(v, a)
#define writel_relaxed(v, a) __writel(v, a)
@@ -119,6 +125,7 @@ static inline phys_addr_t virt_to_phys(volatile void *address)
return __pa(address);
+#define virt_to_phys virt_to_phys

* phys_to_virt - map physical address to virtual
@@ -137,6 +144,7 @@ static inline void *phys_to_virt(phys_addr_t address)
return __va(address);
+#define phys_to_virt phys_to_virt

* Change "struct page" to physical address.
@@ -169,11 +177,14 @@ static inline unsigned int isa_virt_to_bus(volatile void *address)
* else, you probably want one of the following.
extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
+#define ioremap_nocache ioremap_nocache
extern void __iomem *ioremap_uc(resource_size_t offset, unsigned long size);
#define ioremap_uc ioremap_uc

extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
+#define ioremap_cache ioremap_cache
extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val);
+#define ioremap_prot ioremap_prot

* ioremap - map bus memory into CPU space
@@ -193,8 +204,10 @@ static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
return ioremap_nocache(offset, size);
+#define ioremap ioremap

extern void iounmap(volatile void __iomem *addr);
+#define iounmap iounmap

extern void set_iounmap_nonlazy(void);

@@ -220,6 +233,7 @@ memset_io(volatile void __iomem *addr, unsigned char val, size_t count)
memset((void __force *)addr, val, count);
+#define memset_io(dst,c,count) memset_io(dst,c,count)

* memcpy_fromio Copy a block of data from I/O memory
@@ -234,6 +248,7 @@ memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count)
memcpy(dst, (const void __force *)src, count);
+#define memcpy_fromio(to,from,count) memcpy_fromio(to,from,count)

* memcpy_toio Copy a block of data into I/O memory
@@ -248,6 +263,7 @@ memcpy_toio(volatile void __iomem *dst, const void *src, size_t count)
memcpy((void __force *)dst, src, count);
+#define memcpy_toio(to,from,count) memcpy_toio(to,from,count)

* ISA space is 'always mapped' on a typical x86 system, no need to
@@ -341,13 +357,38 @@ BUILDIO(b, b, char)
BUILDIO(w, w, short)
BUILDIO(l, , int)

+#define inb inb
+#define inw inw
+#define inl inl
+#define inb_p inb_p
+#define inw_p inw_p
+#define inl_p inl_p
+#define insb insb
+#define insw insw
+#define insl insl
+#define outb outb
+#define outw outw
+#define outl outl
+#define outb_p outb_p
+#define outw_p outw_p
+#define outl_p outl_p
+#define outsb outsb
+#define outsw outsw
+#define outsl outsl
extern void *xlate_dev_mem_ptr(phys_addr_t phys);
extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);

+#define xlate_dev_mem_ptr xlate_dev_mem_ptr
+#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
enum page_cache_mode pcm);
extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);
+#define ioremap_wc ioremap_wc
extern void __iomem *ioremap_wt(resource_size_t offset, unsigned long size);
+#define ioremap_wt ioremap_wt

extern bool is_early_ioremap_ptep(pte_t *ptep);

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