arch/alpha/include/asm/io_trivial.h

Source file repositories/reference/linux-study-clean/arch/alpha/include/asm/io_trivial.h

File Facts

System
Linux kernel
Corpus path
arch/alpha/include/asm/io_trivial.h
Extension
.h
Size
3416 bytes
Lines
145
Domain
Architecture Layer
Bucket
arch/alpha
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

of the hard work has been done by ioremap and ioportmap, and that
   access to i/o space is linear.  */

/* This file may be included multiple times.  */

#if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
__EXTERN_INLINE u8
IO_CONCAT(__IO_PREFIX,ioread8)(const void __iomem *a)
{
	return __kernel_ldbu(*(const volatile u8 __force *)a);
}

__EXTERN_INLINE u16
IO_CONCAT(__IO_PREFIX,ioread16)(const void __iomem *a)
{
	return __kernel_ldwu(*(const volatile u16 __force *)a);
}

__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite8)(u8 b, void __iomem *a)
{
	__kernel_stb(b, *(volatile u8 __force *)a);
}

__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite16)(u16 b, void __iomem *a)
{
	__kernel_stw(b, *(volatile u16 __force *)a);
}
#endif

#if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
__EXTERN_INLINE u32
IO_CONCAT(__IO_PREFIX,ioread32)(const void __iomem *a)
{
	return *(const volatile u32 __force *)a;
}

__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite32)(u32 b, void __iomem *a)
{
	*(volatile u32 __force *)a = b;
}

__EXTERN_INLINE u64
IO_CONCAT(__IO_PREFIX,ioread64)(const void __iomem *a)
{
	return *(const volatile u64 __force *)a;
}

__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite64)(u64 b, void __iomem *a)
{
	*(volatile u64 __force *)a = b;
}
#endif

#if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
__EXTERN_INLINE u8
IO_CONCAT(__IO_PREFIX,readb)(const volatile void __iomem *a)
{
	return __kernel_ldbu(*(const volatile u8 __force *)a);
}

__EXTERN_INLINE u16
IO_CONCAT(__IO_PREFIX,readw)(const volatile void __iomem *a)
{
	return __kernel_ldwu(*(const volatile u16 __force *)a);
}

__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writeb)(u8 b, volatile void __iomem *a)
{
	__kernel_stb(b, *(volatile u8 __force *)a);
}

__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writew)(u16 b, volatile void __iomem *a)
{
	__kernel_stw(b, *(volatile u16 __force *)a);
}
#elif IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 2
__EXTERN_INLINE u8
IO_CONCAT(__IO_PREFIX,readb)(const volatile void __iomem *a)
{
	const void __iomem *addr = (const void __iomem *)a;
	return IO_CONCAT(__IO_PREFIX,ioread8)(addr);
}

__EXTERN_INLINE u16

Annotation

Implementation Notes