diff options
Diffstat (limited to 'sys/powerpc/aim/mmu_oea.c')
| -rw-r--r-- | sys/powerpc/aim/mmu_oea.c | 121 |
1 files changed, 44 insertions, 77 deletions
diff --git a/sys/powerpc/aim/mmu_oea.c b/sys/powerpc/aim/mmu_oea.c index 9729fa3..df5431d 100644 --- a/sys/powerpc/aim/mmu_oea.c +++ b/sys/powerpc/aim/mmu_oea.c @@ -322,7 +322,6 @@ boolean_t moea_is_modified(mmu_t, vm_page_t); boolean_t moea_ts_referenced(mmu_t, vm_page_t); vm_offset_t moea_map(mmu_t, vm_offset_t *, vm_offset_t, vm_offset_t, int); boolean_t moea_page_exists_quick(mmu_t, pmap_t, vm_page_t); -void moea_page_protect(mmu_t, vm_page_t, vm_prot_t); void moea_pinit(mmu_t, pmap_t); void moea_pinit0(mmu_t, pmap_t); void moea_protect(mmu_t, pmap_t, vm_offset_t, vm_offset_t, vm_prot_t); @@ -331,6 +330,7 @@ void moea_qremove(mmu_t, vm_offset_t, int); void moea_release(mmu_t, pmap_t); void moea_remove(mmu_t, pmap_t, vm_offset_t, vm_offset_t); void moea_remove_all(mmu_t, vm_page_t); +void moea_remove_write(mmu_t, vm_page_t); void moea_zero_page(mmu_t, vm_page_t); void moea_zero_page_area(mmu_t, vm_page_t, int, int); void moea_zero_page_idle(mmu_t, vm_page_t); @@ -358,7 +358,6 @@ static mmu_method_t moea_methods[] = { MMUMETHOD(mmu_ts_referenced, moea_ts_referenced), MMUMETHOD(mmu_map, moea_map), MMUMETHOD(mmu_page_exists_quick,moea_page_exists_quick), - MMUMETHOD(mmu_page_protect, moea_page_protect), MMUMETHOD(mmu_pinit, moea_pinit), MMUMETHOD(mmu_pinit0, moea_pinit0), MMUMETHOD(mmu_protect, moea_protect), @@ -367,6 +366,7 @@ static mmu_method_t moea_methods[] = { MMUMETHOD(mmu_release, moea_release), MMUMETHOD(mmu_remove, moea_remove), MMUMETHOD(mmu_remove_all, moea_remove_all), + MMUMETHOD(mmu_remove_write, moea_remove_write), MMUMETHOD(mmu_zero_page, moea_zero_page), MMUMETHOD(mmu_zero_page_area, moea_zero_page_area), MMUMETHOD(mmu_zero_page_idle, moea_zero_page_idle), @@ -1293,6 +1293,48 @@ moea_clear_modify(mmu_t mmu, vm_page_t m) } /* + * Clear the write and modified bits in each of the given page's mappings. + */ +void +moea_remove_write(mmu_t mmu, vm_page_t m) +{ + struct pvo_entry *pvo; + struct pte *pt; + pmap_t pmap; + u_int lo; + + mtx_assert(&vm_page_queue_mtx, MA_OWNED); + if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0 || + (m->flags & PG_WRITEABLE) == 0) + return; + lo = moea_attr_fetch(m); + SYNC(); + LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { + pmap = pvo->pvo_pmap; + PMAP_LOCK(pmap); + if ((pvo->pvo_pte.pte_lo & PTE_PP) != PTE_BR) { + pt = moea_pvo_to_pte(pvo, -1); + pvo->pvo_pte.pte_lo &= ~PTE_PP; + pvo->pvo_pte.pte_lo |= PTE_BR; + if (pt != NULL) { + moea_pte_synch(pt, &pvo->pvo_pte); + lo |= pvo->pvo_pte.pte_lo; + pvo->pvo_pte.pte_lo &= ~PTE_CHG; + moea_pte_change(pt, &pvo->pvo_pte, + pvo->pvo_vaddr); + mtx_unlock(&moea_table_mutex); + } + } + PMAP_UNLOCK(pmap); + } + if ((lo & PTE_CHG) != 0) { + moea_attr_clear(m, PTE_CHG); + vm_page_dirty(m); + } + vm_page_flag_clear(m, PG_WRITEABLE); +} + +/* * moea_ts_referenced: * * Return a count of reference bits for a page, clearing those bits. @@ -1420,81 +1462,6 @@ moea_map(mmu_t mmu, vm_offset_t *virt, vm_offset_t pa_start, } /* - * Lower the permission for all mappings to a given page. - */ -void -moea_page_protect(mmu_t mmu, vm_page_t m, vm_prot_t prot) -{ - struct pvo_head *pvo_head; - struct pvo_entry *pvo, *next_pvo; - struct pte *pt; - pmap_t pmap; - - /* - * Since the routine only downgrades protection, if the - * maximal protection is desired, there isn't any change - * to be made. - */ - if ((prot & (VM_PROT_READ|VM_PROT_WRITE)) == - (VM_PROT_READ|VM_PROT_WRITE)) - return; - - pvo_head = vm_page_to_pvoh(m); - for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) { - next_pvo = LIST_NEXT(pvo, pvo_vlink); - MOEA_PVO_CHECK(pvo); /* sanity check */ - pmap = pvo->pvo_pmap; - PMAP_LOCK(pmap); - - /* - * Downgrading to no mapping at all, we just remove the entry. - */ - if ((prot & VM_PROT_READ) == 0) { - moea_pvo_remove(pvo, -1); - PMAP_UNLOCK(pmap); - continue; - } - - /* - * If EXEC permission is being revoked, just clear the flag - * in the PVO. - */ - if ((prot & VM_PROT_EXECUTE) == 0) - pvo->pvo_vaddr &= ~PVO_EXECUTABLE; - - /* - * If this entry is already RO, don't diddle with the page - * table. - */ - if ((pvo->pvo_pte.pte_lo & PTE_PP) == PTE_BR) { - PMAP_UNLOCK(pmap); - MOEA_PVO_CHECK(pvo); - continue; - } - - /* - * Grab the PTE before we diddle the bits so pvo_to_pte can - * verify the pte contents are as expected. - */ - pt = moea_pvo_to_pte(pvo, -1); - pvo->pvo_pte.pte_lo &= ~PTE_PP; - pvo->pvo_pte.pte_lo |= PTE_BR; - if (pt != NULL) { - moea_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr); - mtx_unlock(&moea_table_mutex); - } - PMAP_UNLOCK(pmap); - MOEA_PVO_CHECK(pvo); /* sanity check */ - } - - /* - * Downgrading from writeable: clear the VM page flag - */ - if ((prot & VM_PROT_WRITE) != VM_PROT_WRITE) - vm_page_flag_clear(m, PG_WRITEABLE); -} - -/* * Returns true if the pmap's pv is one of the first * 16 pvs linked to from this page. This count may * be changed upwards or downwards in the future; it |
