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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* 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.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 _SYS_MMIO_H_
#define _SYS_MMIO_H_
#include <sys/types.h>
#include <sys/cdefs.h>
#if defined(_KERNEL)
#include <vm/vm.h>
#endif
#if defined(_KERNEL)
/*
* mmio_write<n> - Writes to MMIO address with specific size
*
* @addr: Address to write to.
* @val: Value to write.
*
* These functions will add the higher half
* offset (VM_HIGHER_HALF) if the MMIO address
* is less than VM_HIGHER_HALF as it'll be safe
* to assume it's a physical address. Page faults
* from writes could be due to the resulting virtual
* address not being mapped.
*/
#define _MMIO_WRITE_TYPE(TYPE, SUFFIX) \
static inline void \
mmio_write##SUFFIX(volatile void *addr, TYPE val) \
{ \
uintptr_t tmp; \
\
tmp = (uintptr_t)addr; \
if (tmp < VM_HIGHER_HALF) { \
tmp += VM_HIGHER_HALF; \
} \
*(volatile TYPE *)tmp = val; \
__barrier(); \
}
/*
* mmio_read<n> - Does the same as mmio_write<n> but for reading
*
* @addr: Address to read from.
*/
#define _MMIO_READ_TYPE(TYPE, SUFFIX) \
static inline TYPE \
mmio_read##SUFFIX(volatile void *addr) \
{ \
uintptr_t tmp; \
\
tmp = (uintptr_t)addr; \
if (tmp < VM_HIGHER_HALF) { \
tmp += VM_HIGHER_HALF; \
} \
\
__barrier(); \
return *(volatile TYPE *)tmp; \
}
/*
* To write to an MMIO address of, for example,
* 8 bits, use mmio_write8(addr, val)
*/
_MMIO_WRITE_TYPE(uint8_t, 8)
_MMIO_WRITE_TYPE(uint16_t, 16)
_MMIO_WRITE_TYPE(uint32_t, 32)
#if __SIZEOF_SIZE_T__ == 8
_MMIO_WRITE_TYPE(uint64_t, 64)
#endif
__extension__
/*
* To read from an MMIO address of, for example,
* 8 bits, use mmio_read8(addr)
*/
_MMIO_READ_TYPE(uint8_t, 8)
_MMIO_READ_TYPE(uint16_t, 16)
_MMIO_READ_TYPE(uint32_t, 32)
#if __SIZEOF_SIZE_T__ == 8
_MMIO_READ_TYPE(uint64_t, 64)
#endif
__extension__
#endif /* _KERNEL */
#endif /* !_SYS_MMIO_H_ */
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