WebSVN – HelenOS – Diff – /trunk/kernel/generic/src/mm/as.c



    as_slab = slab_cache_create("as_slab", sizeof(as_t), 0,
        as_constructor, as_destructor, SLAB_CACHE_MAGDEFERRED);
   
    AS_KERNEL = as_create(FLAG_AS_KERNEL);
    if (!AS_KERNEL)
        panic("Cannot create kernel address space\n");
   
    /* Make sure the kernel address space
     * reference count never drops to zero.
     */
    atomic_set(&AS_KERNEL->refcount, 1);
}
 
/** Create address space.
 *
 * @param flags     Flags that influence the way in wich the address space

#ifdef AS_PAGE_TABLE
    as->genarch.page_table = page_table_create(flags);
#else
    page_table_create(flags);
#endif
   
    return as;
}
 
/** Destroy adress space.
 *

 * The idea is to have the same data, but with a different access mode.
 * This is needed e.g. for writing code into memory and then executing it.
 * In order for this to work properly, this may copy the data
 * into private anonymous memory (unless it's already there).
 *
 * @param as      Address space.
 * @param flags   Flags of the area memory.
 * @param address Address within the area to be changed.
 *
 * @return Zero on success or a value from @ref errno.h on failure.
 *
 
 */
int as_area_change_flags(as_t *as, int flags, uintptr_t address)
{
    as_area_t *area;
    uintptr_t base;

    ipl_t ipl;
    int page_flags;
    uintptr_t *old_frame;
    index_t frame_idx;
    count_t used_pages;
   
    /* Flags for the new memory mapping */
    page_flags = area_flags_to_page_flags(flags);
 
    ipl = interrupts_disable();
    mutex_lock(&as->lock);

        mutex_unlock(&as->lock);
        interrupts_restore(ipl);
        return ENOENT;
    }
 
    if ((area->sh_info) || (area->backend != &anon_backend)) {
        /* Copying shared areas not supported yet */
        /* Copying non-anonymous memory not supported yet */
        mutex_unlock(&area->lock);
        mutex_unlock(&as->lock);
        interrupts_restore(ipl);

    /*
     * Finish TLB shootdown sequence.
     */
 
    tlb_invalidate_pages(as->asid, area->base, area->pages);
   
    /*
     * Invalidate potential software translation caches (e.g. TSB on
     * sparc64).
     */
    as_invalidate_translation_cache(as, area->base, area->pages);

Rev 3422	Rev 3707
Line 144...	Line 144...
144	as_slab = slab_cache_create("as_slab", sizeof(as_t), 0,	144	as_slab = slab_cache_create("as_slab", sizeof(as_t), 0,
145	as_constructor, as_destructor, SLAB_CACHE_MAGDEFERRED);	145	as_constructor, as_destructor, SLAB_CACHE_MAGDEFERRED);
146		146
147	AS_KERNEL = as_create(FLAG_AS_KERNEL);	147	AS_KERNEL = as_create(FLAG_AS_KERNEL);
148	if (!AS_KERNEL)	148	if (!AS_KERNEL)
149	panic("can't create kernel address space\n");	149	panic("Cannot create kernel address space\n");
150		150
-		151	/* Make sure the kernel address space
-		152	* reference count never drops to zero.
-		153	*/
-		154	atomic_set(&AS_KERNEL->refcount, 1);
151	}	155	}
152		156
153	/** Create address space.	157	/** Create address space.
154	*	158	*
155	* @param flags Flags that influence the way in wich the address space	159	* @param flags Flags that influence the way in wich the address space
Line 174...	Line 178...
174	#ifdef AS_PAGE_TABLE	178	#ifdef AS_PAGE_TABLE
175	as->genarch.page_table = page_table_create(flags);	179	as->genarch.page_table = page_table_create(flags);
176	#else	180	#else
177	page_table_create(flags);	181	page_table_create(flags);
178	#endif	182	#endif
179		183
180	return as;	184	return as;
181	}	185	}
182		186
183	/** Destroy adress space.	187	/** Destroy adress space.
184	*	188	*
Line 767...	Line 771...
767	* The idea is to have the same data, but with a different access mode.	771	* The idea is to have the same data, but with a different access mode.
768	* This is needed e.g. for writing code into memory and then executing it.	772	* This is needed e.g. for writing code into memory and then executing it.
769	* In order for this to work properly, this may copy the data	773	* In order for this to work properly, this may copy the data
770	* into private anonymous memory (unless it's already there).	774	* into private anonymous memory (unless it's already there).
771	*	775	*
772	* @param as Address space.	776	* @param as Address space.
773	* @param flags Flags of the area memory.	777	* @param flags Flags of the area memory.
774	* @param address Address withing the area to be changed.	778	* @param address Address within the area to be changed.
-		779	*
-		780	* @return Zero on success or a value from @ref errno.h on failure.
775	*	781	*
776	* @return Zero on success or a value from @ref errno.h on failure.	-
777	*/	782	*/
778	int as_area_change_flags(as_t *as, int flags, uintptr_t address)	783	int as_area_change_flags(as_t *as, int flags, uintptr_t address)
779	{	784	{
780	as_area_t *area;	785	as_area_t *area;
781	uintptr_t base;	786	uintptr_t base;
Line 783...	Line 788...
783	ipl_t ipl;	788	ipl_t ipl;
784	int page_flags;	789	int page_flags;
785	uintptr_t *old_frame;	790	uintptr_t *old_frame;
786	index_t frame_idx;	791	index_t frame_idx;
787	count_t used_pages;	792	count_t used_pages;
788		793
789	/* Flags for the new memory mapping */	794	/* Flags for the new memory mapping */
790	page_flags = area_flags_to_page_flags(flags);	795	page_flags = area_flags_to_page_flags(flags);
791		796
792	ipl = interrupts_disable();	797	ipl = interrupts_disable();
793	mutex_lock(&as->lock);	798	mutex_lock(&as->lock);
Line 797...	Line 802...
797	mutex_unlock(&as->lock);	802	mutex_unlock(&as->lock);
798	interrupts_restore(ipl);	803	interrupts_restore(ipl);
799	return ENOENT;	804	return ENOENT;
800	}	805	}
801		806
802	if (area->sh_info \|\| area->backend != &anon_backend) {	807	if ((area->sh_info) \|\| (area->backend != &anon_backend)) {
803	/* Copying shared areas not supported yet */	808	/* Copying shared areas not supported yet */
804	/* Copying non-anonymous memory not supported yet */	809	/* Copying non-anonymous memory not supported yet */
805	mutex_unlock(&area->lock);	810	mutex_unlock(&area->lock);
806	mutex_unlock(&as->lock);	811	mutex_unlock(&as->lock);
807	interrupts_restore(ipl);	812	interrupts_restore(ipl);
Line 868...	Line 873...
868	/*	873	/*
869	* Finish TLB shootdown sequence.	874	* Finish TLB shootdown sequence.
870	*/	875	*/
871		876
872	tlb_invalidate_pages(as->asid, area->base, area->pages);	877	tlb_invalidate_pages(as->asid, area->base, area->pages);
-		878
873	/*	879	/*
874	* Invalidate potential software translation caches (e.g. TSB on	880	* Invalidate potential software translation caches (e.g. TSB on
875	* sparc64).	881	* sparc64).
876	*/	882	*/
877	as_invalidate_translation_cache(as, area->base, area->pages);	883	as_invalidate_translation_cache(as, area->base, area->pages);

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(root)/trunk/kernel/generic/src/mm/as.c – Rev 3422 → 3707