102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
|
|
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. 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 copyright holder 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 HOLDER 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.
|
|
*/
|
|
|
|
#include "fcntl.h"
|
|
#include "linux/kernel.h"
|
|
#include "fs/driver.h"
|
|
|
|
static int MemOpen(struct file *filep)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int MemClose(struct file *filep)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t MemRead(struct file *filep, char *buffer, size_t buflen)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t MemWrite(struct file *filep, const char *buffer, size_t buflen)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t MemMap(struct file *filep, LosVmMapRegion *region)
|
|
{
|
|
#ifdef LOSCFG_KERNEL_VM
|
|
size_t size = region->range.size;
|
|
PADDR_T paddr = region->pgOff << PAGE_SHIFT;
|
|
VADDR_T vaddr = region->range.base;
|
|
LosVmSpace *space = LOS_SpaceGet(vaddr);
|
|
|
|
if (((paddr + size) >= SYS_MEM_BASE) && (paddr < SYS_MEM_END)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Peripheral register memory adds strongly ordered attributes */
|
|
region->regionFlags |= VM_MAP_REGION_FLAG_STRONGLY_ORDERED;
|
|
|
|
if (space == NULL) {
|
|
return -EAGAIN;
|
|
}
|
|
if (LOS_ArchMmuMap(&space->archMmu, vaddr, paddr, size >> PAGE_SHIFT, region->regionFlags) <= 0) {
|
|
return -EAGAIN;
|
|
}
|
|
#else
|
|
UNUSED(filep);
|
|
UNUSED(region);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations_vfs g_memDevOps = {
|
|
MemOpen, /* open */
|
|
MemClose, /* close */
|
|
MemRead, /* read */
|
|
MemWrite, /* write */
|
|
NULL, /* seek */
|
|
NULL, /* ioctl */
|
|
MemMap, /* mmap */
|
|
#ifndef CONFIG_DISABLE_POLL
|
|
NULL, /* poll */
|
|
#endif
|
|
NULL, /* unlink */
|
|
};
|
|
|
|
int DevMemRegister(void)
|
|
{
|
|
return register_driver("/dev/mem", &g_memDevOps, 0644, 0); /* 0644: file mode */
|
|
}
|