87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
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/*
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* Copyright (C) 2010-2011 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained from Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/sched.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/atomic.h>
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#include "mali_osk.h"
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#include "mali_ukk.h"
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#include "mali_kernel_common.h"
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/**
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* @file mali_osk_specific.c
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* Implementation of per-OS Kernel level specifics
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*/
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_mali_osk_errcode_t _mali_osk_specific_indirect_mmap( _mali_uk_mem_mmap_s *args )
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{
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/* args->ctx ignored here; args->ukk_private required instead */
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/* we need to lock the mmap semaphore before calling the do_mmap function */
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down_write(¤t->mm->mmap_sem);
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args->mapping = (void __user *)do_mmap(
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(struct file *)args->ukk_private,
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0, /* start mapping from any address after NULL */
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args->size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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args->phys_addr
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);
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/* and unlock it after the call */
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up_write(¤t->mm->mmap_sem);
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/* No cookie required here */
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args->cookie = 0;
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/* uku_private meaningless, so zero */
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args->uku_private = NULL;
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if ( (NULL == args->mapping) || IS_ERR((void *)args->mapping) )
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{
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return _MALI_OSK_ERR_FAULT;
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}
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/* Success */
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return _MALI_OSK_ERR_OK;
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}
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_mali_osk_errcode_t _mali_osk_specific_indirect_munmap( _mali_uk_mem_munmap_s *args )
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{
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/* args->ctx and args->cookie ignored here */
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if ((NULL != current) && (NULL != current->mm))
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{
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/* remove mapping of mali memory from the process' view */
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/* lock mmap semaphore before call */
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/* lock mmap_sem before calling do_munmap */
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down_write(¤t->mm->mmap_sem);
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do_munmap(
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current->mm,
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(unsigned long)args->mapping,
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args->size
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);
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/* and unlock after call */
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up_write(¤t->mm->mmap_sem);
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MALI_DEBUG_PRINT(5, ("unmapped\n"));
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}
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else
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{
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MALI_DEBUG_PRINT(2, ("Freeing of a big block while no user process attached, assuming crash cleanup in progress\n"));
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}
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return _MALI_OSK_ERR_OK; /* always succeeds */
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}
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