mirror of
https://github.com/clearlinux/kvmtool.git
synced 2026-09-03 20:21:27 +00:00
Andre Przywara
2006613929
In util/iovec.c we reference EXPORT_SYMBOL, which is only useful within the kernel. To get rid of the dummy include file, simply remove those lines. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
/*
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* iovec manipulation routines.
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Fixes:
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* Andrew Lunn : Errors in iovec copying.
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* Pedro Roque : Added memcpy_fromiovecend and
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* csum_..._fromiovecend.
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* Andi Kleen : fixed error handling for 2.1
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* Alexey Kuznetsov: 2.1 optimisations
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* Andi Kleen : Fix csum*fromiovecend for IPv6.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/compiler.h>
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#include <sys/uio.h>
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#include <kvm/iovec.h>
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#include <string.h>
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/*
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* Copy kernel to iovec. Returns -EFAULT on error.
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*
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* Note: this modifies the original iovec.
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*/
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int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len)
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{
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while (len > 0) {
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if (iov->iov_len) {
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int copy = min_t(unsigned int, iov->iov_len, len);
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memcpy(iov->iov_base, kdata, copy);
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kdata += copy;
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len -= copy;
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iov->iov_len -= copy;
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iov->iov_base += copy;
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}
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iov++;
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}
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return 0;
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}
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/*
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* Copy kernel to iovec. Returns -EFAULT on error.
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*/
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int memcpy_toiovecend(const struct iovec *iov, unsigned char *kdata,
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size_t offset, int len)
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{
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int copy;
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for (; len > 0; ++iov) {
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/* Skip over the finished iovecs */
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if (unlikely(offset >= iov->iov_len)) {
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offset -= iov->iov_len;
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continue;
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}
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copy = min_t(unsigned int, iov->iov_len - offset, len);
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memcpy(iov->iov_base + offset, kdata, copy);
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offset = 0;
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kdata += copy;
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len -= copy;
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}
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return 0;
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}
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/*
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* Copy iovec to kernel. Returns -EFAULT on error.
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*
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* Note: this modifies the original iovec.
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*/
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int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len)
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{
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while (len > 0) {
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if (iov->iov_len) {
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int copy = min_t(unsigned int, len, iov->iov_len);
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memcpy(kdata, iov->iov_base, copy);
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len -= copy;
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kdata += copy;
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iov->iov_base += copy;
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iov->iov_len -= copy;
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}
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iov++;
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}
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return 0;
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}
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/*
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* Copy iovec from kernel. Returns -EFAULT on error.
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*/
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int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
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size_t offset, int len)
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{
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/* Skip over the finished iovecs */
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while (offset >= iov->iov_len) {
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offset -= iov->iov_len;
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iov++;
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}
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while (len > 0) {
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char *base = iov->iov_base + offset;
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int copy = min_t(unsigned int, len, iov->iov_len - offset);
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offset = 0;
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memcpy(kdata, base, copy);
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len -= copy;
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kdata += copy;
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iov++;
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}
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return 0;
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}
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