45cab335bc
This is the first step toward isolating standard C and POSIX headers into a single replaceable header file. Change-Id: I527297f5e7260b01103018ad3429922962ee9add Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*-
|
|
* BSD LICENSE
|
|
*
|
|
* Copyright (c) Intel Corporation.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * 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.
|
|
* * Neither the name of Intel Corporation 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.
|
|
*/
|
|
|
|
/** \file
|
|
* Memory-mapped I/O utility functions
|
|
*/
|
|
|
|
#ifndef SPDK_MMIO_H
|
|
#define SPDK_MMIO_H
|
|
|
|
#include "spdk/stdinc.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include "spdk/barrier.h"
|
|
|
|
#ifdef __x86_64__
|
|
#define SPDK_MMIO_64BIT 1 /* Can do atomic 64-bit memory read/write (over PCIe) */
|
|
#else
|
|
#define SPDK_MMIO_64BIT 0
|
|
#endif
|
|
|
|
static inline uint32_t
|
|
spdk_mmio_read_4(const volatile uint32_t *addr)
|
|
{
|
|
spdk_compiler_barrier();
|
|
return *addr;
|
|
}
|
|
|
|
static inline void
|
|
spdk_mmio_write_4(volatile uint32_t *addr, uint32_t val)
|
|
{
|
|
spdk_compiler_barrier();
|
|
*addr = val;
|
|
}
|
|
|
|
static inline uint64_t
|
|
spdk_mmio_read_8(volatile uint64_t *addr)
|
|
{
|
|
uint64_t val;
|
|
volatile uint32_t *addr32 = (volatile uint32_t *)addr;
|
|
|
|
spdk_compiler_barrier();
|
|
|
|
if (SPDK_MMIO_64BIT) {
|
|
val = *addr;
|
|
} else {
|
|
/*
|
|
* Read lower 4 bytes before upper 4 bytes.
|
|
* This particular order is required by I/OAT.
|
|
* If the other order is required, use a pair of spdk_mmio_read_4() calls.
|
|
*/
|
|
val = addr32[0];
|
|
val |= (uint64_t)addr32[1] << 32;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static inline void
|
|
spdk_mmio_write_8(volatile uint64_t *addr, uint64_t val)
|
|
{
|
|
volatile uint32_t *addr32 = (volatile uint32_t *)addr;
|
|
|
|
spdk_compiler_barrier();
|
|
|
|
if (SPDK_MMIO_64BIT) {
|
|
*addr = val;
|
|
} else {
|
|
addr32[0] = (uint32_t)val;
|
|
addr32[1] = (uint32_t)(val >> 32);
|
|
}
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|