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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)
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        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
     */
-
 
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    atomic_set(&AS_KERNEL->refcount, 1);
151
}
155
}
152
 
156
 
153
/** Create address space.
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/** Create address space.
154
 *
158
 *
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 * @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...
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#ifdef AS_PAGE_TABLE
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#ifdef AS_PAGE_TABLE
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    as->genarch.page_table = page_table_create(flags);
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    as->genarch.page_table = page_table_create(flags);
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#else
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#else
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    page_table_create(flags);
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    page_table_create(flags);
178
#endif
182
#endif
179
 
183
   
180
    return as;
184
    return as;
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}
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}
182
 
186
 
183
/** Destroy adress space.
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/** Destroy adress space.
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 *
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 *
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);