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hardware_samsung/exynos4/hal/libump/os/linux/ump_uku.c

193 lines
5.0 KiB

/*
* Copyright (C) 2010-2011 ARM Limited. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file ump_uku.c
* File implements the user side of the user-kernel interface
*/
#include "../ump_uku.h"
#include <stdio.h>
#include "ump_ioctl.h"
#include <sys/mman.h>
/* Needed for file operations on the device file*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
static _ump_osu_errcode_t ump_driver_ioctl(void *context, u32 command, void *args);
static int ump_ioctl_api_version_used = UMP_IOCTL_API_VERSION;
/**
* The device file to access the UMP device driver
* This is a character special file giving access to the device driver.
* Usually created using the mknod command line utility.
*/
static const char ump_device_file_name[] = "/dev/ump";
_ump_osu_errcode_t _ump_uku_open( void **context )
{
int ump_device_file;
if(NULL == context)
{
return _UMP_OSU_ERR_FAULT;
}
ump_device_file = open(ump_device_file_name, O_RDWR);
if (-1 == ump_device_file)
{
return _UMP_OSU_ERR_FAULT;
}
{
struct _ump_uk_api_version_s args;
args.ctx = (void*)ump_device_file;
args.version = UMP_IOCTL_API_VERSION;
args.compatible = 3;
ump_driver_ioctl(args.ctx, UMP_IOC_QUERY_API_VERSION, &args);
if ( 1 != args.compatible )
{
if (IS_API_MATCH(MAKE_VERSION_ID(1), args.version))
{
ump_ioctl_api_version_used = MAKE_VERSION_ID(1);
UMP_PRINTF("The UMP devicedriver does not support cached UMP. Update it if this is needed.\n");
}
else
{
UMP_PRINTF("The UMP devicedriver is version: %d, UMP libraries is version: %d.\n", GET_VERSION(args.version), GET_VERSION(UMP_IOCTL_API_VERSION) );
close(ump_device_file);
return _UMP_OSU_ERR_FAULT;
}
}
}
*context = (void *) ump_device_file;
return _UMP_OSU_ERR_OK;
}
_ump_osu_errcode_t _ump_uku_close( void **context )
{
if(NULL == context)
{
return _UMP_OSU_ERR_FAULT;
}
if(-1 == (int)*context)
{
return _UMP_OSU_ERR_FAULT;
}
close((int)*context);
*context = (void *)-1;
return _UMP_OSU_ERR_OK;
}
int _ump_uku_allocate(_ump_uk_allocate_s *args)
{
return ump_driver_ioctl(args->ctx, UMP_IOC_ALLOCATE, args);
}
_ump_osu_errcode_t _ump_uku_release(_ump_uk_release_s *args)
{
return ump_driver_ioctl(args->ctx, UMP_IOC_RELEASE, args);
}
_ump_osu_errcode_t _ump_uku_size_get(_ump_uk_size_get_s *args)
{
return ump_driver_ioctl(args->ctx, UMP_IOC_SIZE_GET, args);
}
void _ump_uku_msynch(_ump_uk_msync_s *args)
{
/* This is for backwards compatibillity */
if ( MAKE_VERSION_ID(1) == ump_ioctl_api_version_used)
{
args->is_cached = 0;
if ( _UMP_UK_MSYNC_READOUT_CACHE_ENABLED != args->op )
{
UMP_DEBUG_PRINT(3, ("Warning: Doing UMP cache flush operations on a Device Driver that does not support cached UMP mem.\n"));
}
return;
}
ump_driver_ioctl(args->ctx, UMP_IOC_MSYNC, args);
}
int _ump_uku_map_mem(_ump_uk_map_mem_s *args)
{
int flags;
if( -1 == (int)args->ctx )
{
return -1;
}
flags = MAP_SHARED;
/* This is for backwards compatibillity */
if ( MAKE_VERSION_ID(1) == ump_ioctl_api_version_used)
{
args->is_cached = 0;
}
/* If we want the Caching to be enabled we set the flags to be PRIVATE. The UMP DD reads this and do proper handling
Note: this enforces the user to use proper invalidation*/
if ( args->is_cached ) flags = MAP_PRIVATE;
args->mapping = mmap(NULL, args->size, PROT_READ | PROT_WRITE ,flags , (int)args->ctx, (off_t)args->secure_id * sysconf(_SC_PAGE_SIZE));
if (MAP_FAILED == args->mapping)
{
return -1;
}
args->cookie = 0; /* Cookie is not used in linux _ump_uku_unmap_mem */
return 0;
}
void _ump_uku_unmap_mem( _ump_uk_unmap_mem_s *args )
{
/*
* If a smaller size is used Linux will just remove the requested range but don't tell
* the ump driver before all of it is unmapped, either via another unmap request or upon process shutdown.
* Unmapping too much will just ignore the overhead or hit undefined behavior,
* only affecting the calling process which could mess itself up in other ways anyway.
* So we don't need any security checks here.
*/
munmap(args->mapping, args->size);
}
static _ump_osu_errcode_t ump_driver_ioctl(void *context, u32 command, void *args)
{
/*UMP_CHECK_NON_NULL(args, _UMP_OSK_ERR_INVALID_ARGS);*/
/* check for a valid file descriptor */
/** @note manual type safety check-point */
if( -1 == (int)context )
{
return _UMP_OSU_ERR_FAULT;
}
/* call ioctl handler of driver */
if (0 != ioctl((int)context, command, args)) return -1;
return _UMP_OSU_ERR_OK;
}