arch/mips/lib/iomap_copy.c

Source file repositories/reference/linux-study-clean/arch/mips/lib/iomap_copy.c

File Facts

System
Linux kernel
Corpus path
arch/mips/lib/iomap_copy.c
Extension
.c
Size
807 bytes
Lines
30
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/export.h>
#include <linux/io.h>

/**
 * __ioread64_copy - copy data from MMIO space, in 64-bit units
 * @to: destination (must be 64-bit aligned)
 * @from: source, in MMIO space (must be 64-bit aligned)
 * @count: number of 64-bit quantities to copy
 *
 * Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a
 * time.  Order of access is not guaranteed, nor is a memory barrier
 * performed afterwards.
 */
void __ioread64_copy(void *to, const void __iomem *from, size_t count)
{
#ifdef CONFIG_64BIT
	u64 *dst = to;
	const u64 __iomem *src = from;
	const u64 __iomem *end = src + count;

	while (src < end)
		*dst++ = __raw_readq(src++);
#else
	__ioread32_copy(to, from, count * 2);
#endif
}
EXPORT_SYMBOL_GPL(__ioread64_copy);

Annotation

Implementation Notes