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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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5a8b4b4001
The newly added file did not quite get the punctuation right: lib/iomem_copy.c:14: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202410290907.0mDZVYPK-lkp@intel.com/ Signed-off-by: Arnd Bergmann <arnd@arndb.de>
137 lines
2.6 KiB
C
137 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2024 Kalray, Inc. All Rights Reserved.
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*/
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#include <linux/align.h>
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#include <linux/export.h>
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#include <linux/io.h>
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#include <linux/types.h>
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#include <linux/unaligned.h>
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#ifndef memset_io
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/**
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* memset_io() - Set a range of I/O memory to a constant value
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* @addr: The beginning of the I/O-memory range to set
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* @val: The value to set the memory to
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* @count: The number of bytes to set
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*
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* Set a range of I/O memory to a given value.
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*/
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void memset_io(volatile void __iomem *addr, int val, size_t count)
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{
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long qc = (u8)val;
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qc *= ~0UL / 0xff;
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while (count && !IS_ALIGNED((long)addr, sizeof(long))) {
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__raw_writeb(val, addr);
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addr++;
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count--;
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}
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while (count >= sizeof(long)) {
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#ifdef CONFIG_64BIT
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__raw_writeq(qc, addr);
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#else
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__raw_writel(qc, addr);
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#endif
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addr += sizeof(long);
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count -= sizeof(long);
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}
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while (count) {
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__raw_writeb(val, addr);
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addr++;
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count--;
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}
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}
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EXPORT_SYMBOL(memset_io);
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#endif
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#ifndef memcpy_fromio
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/**
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* memcpy_fromio() - Copy a block of data from I/O memory
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* @dst: The (RAM) destination for the copy
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* @src: The (I/O memory) source for the data
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* @count: The number of bytes to copy
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*
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* Copy a block of data from I/O memory.
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*/
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void memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count)
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{
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while (count && !IS_ALIGNED((long)src, sizeof(long))) {
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*(u8 *)dst = __raw_readb(src);
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src++;
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dst++;
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count--;
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}
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while (count >= sizeof(long)) {
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#ifdef CONFIG_64BIT
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long val = __raw_readq(src);
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#else
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long val = __raw_readl(src);
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#endif
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put_unaligned(val, (long *)dst);
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src += sizeof(long);
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dst += sizeof(long);
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count -= sizeof(long);
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}
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while (count) {
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*(u8 *)dst = __raw_readb(src);
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src++;
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dst++;
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count--;
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}
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}
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EXPORT_SYMBOL(memcpy_fromio);
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#endif
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#ifndef memcpy_toio
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/**
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* memcpy_toio() -Copy a block of data into I/O memory
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* @dst: The (I/O memory) destination for the copy
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* @src: The (RAM) source for the data
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* @count: The number of bytes to copy
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*
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* Copy a block of data to I/O memory.
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*/
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void memcpy_toio(volatile void __iomem *dst, const void *src, size_t count)
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{
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while (count && !IS_ALIGNED((long)dst, sizeof(long))) {
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__raw_writeb(*(u8 *)src, dst);
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src++;
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dst++;
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count--;
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}
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while (count >= sizeof(long)) {
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long val = get_unaligned((long *)src);
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#ifdef CONFIG_64BIT
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__raw_writeq(val, dst);
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#else
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__raw_writel(val, dst);
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#endif
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src += sizeof(long);
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dst += sizeof(long);
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count -= sizeof(long);
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}
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while (count) {
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__raw_writeb(*(u8 *)src, dst);
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src++;
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dst++;
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count--;
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}
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}
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EXPORT_SYMBOL(memcpy_toio);
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#endif
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