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/*
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/sched.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/atomic.h>
#include "mali_osk.h"
#include "mali_ukk.h"
#include "mali_kernel_common.h"
/**
* @file mali_osk_specific.c
* Implementation of per-OS Kernel level specifics
*/
_mali_osk_errcode_t _mali_osk_specific_indirect_mmap( _mali_uk_mem_mmap_s *args )
{
/* args->ctx ignored here; args->ukk_private required instead */
/* we need to lock the mmap semaphore before calling the do_mmap function */
down_write(¤t->mm->mmap_sem);
args->mapping = (void __user *)do_mmap(
(struct file *)args->ukk_private,
0, /* start mapping from any address after NULL */
args->size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
args->phys_addr
);
/* and unlock it after the call */
up_write(¤t->mm->mmap_sem);
/* No cookie required here */
args->cookie = 0;
/* uku_private meaningless, so zero */
args->uku_private = NULL;
if ( (NULL == args->mapping) || IS_ERR((void *)args->mapping) )
{
return _MALI_OSK_ERR_FAULT;
}
/* Success */
return _MALI_OSK_ERR_OK;
}
_mali_osk_errcode_t _mali_osk_specific_indirect_munmap( _mali_uk_mem_munmap_s *args )
{
/* args->ctx and args->cookie ignored here */
if ((NULL != current) && (NULL != current->mm))
{
/* remove mapping of mali memory from the process' view */
/* lock mmap semaphore before call */
/* lock mmap_sem before calling do_munmap */
down_write(¤t->mm->mmap_sem);
do_munmap(
current->mm,
(unsigned long)args->mapping,
args->size
);
/* and unlock after call */
up_write(¤t->mm->mmap_sem);
MALI_DEBUG_PRINT(5, ("unmapped\n"));
}
else
{
MALI_DEBUG_PRINT(2, ("Freeing of a big block while no user process attached, assuming crash cleanup in progress\n"));
}
return _MALI_OSK_ERR_OK; /* always succeeds */
}
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