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linuxkpi: Add non-atomic readq()/writeq()

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The non-atomic versions are required by drm-510-kmod to build on 32-bit
architectures.

Approved by:		hselasky, manu, tcberner (mentor)
Differential Revision:	https://reviews.freebsd.org/D36507
This commit is contained in:
Felix Palmen 2022-09-09 16:01:22 +02:00
parent 3fc174845c
commit 600f161295
2 changed files with 65 additions and 0 deletions
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65
sys/compat/linuxkpi/common/include/linux/io-64-nonatomic-lo-hi.h Normal file
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2022 Felix Palmen
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_IO_64_NONATOMIC_LO_HI_H_
#define _LINUXKPI_LINUX_IO_64_NONATOMIC_LO_HI_H_
#include <linux/io.h>
static inline uint64_t
lo_hi_readq(const volatile void *addr)
{
const volatile uint32_t *p = addr;
uint32_t l, h;
__io_br();
l = le32toh(__raw_readl(p));
h = le32toh(__raw_readl(p + 1));
__io_ar();
return (l + ((uint64_t)h << 32));
}
static inline void
lo_hi_writeq(uint64_t v, volatile void *addr)
{
volatile uint32_t *p = addr;
__io_bw();
__raw_writel(htole32(v), p);
__raw_writel(htole32(v >> 32), p + 1);
__io_aw();
}
#ifndef readq
#define readq(addr) lo_hi_readq(addr)
#endif
#ifndef writeq
#define writeq(v, addr) lo_hi_writeq(v, addr)
#endif
#endif /* _LINUXKPI_LINUX_IO_64_NONATOMIC_LO_HI_H_ */

0
sys/compat/linuxkpi/dummy/include/linux/io-64-nonatomic-lo-hi.h
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