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Implement pmap_advise().

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Alan Cox 2013-08-31 16:21:13 +00:00
parent 1645995b97
commit f00154a765
1 changed files with 82 additions and 1 deletions
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83
sys/mips/mips/pmap.c
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@ -2914,11 +2914,92 @@ pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr)
}
/*
* This function is advisory.
* Apply the given advice to the specified range of addresses within the
* given pmap. Depending on the advice, clear the referenced and/or
* modified flags in each mapping and set the mapped page's dirty field.
*/
void
pmap_advise(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, int advice)
{
pd_entry_t *pde, *pdpe;
pt_entry_t *pte;
vm_offset_t va, va_next;
vm_paddr_t pa;
vm_page_t m;
if (advice != MADV_DONTNEED && advice != MADV_FREE)
return;
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
for (; sva < eva; sva = va_next) {
pdpe = pmap_segmap(pmap, sva);
#ifdef __mips_n64
if (*pdpe == 0) {
va_next = (sva + NBSEG) & ~SEGMASK;
if (va_next < sva)
va_next = eva;
continue;
}
#endif
va_next = (sva + NBPDR) & ~PDRMASK;
if (va_next < sva)
va_next = eva;
pde = pmap_pdpe_to_pde(pdpe, sva);
if (*pde == NULL)
continue;
/*
* Limit our scan to either the end of the va represented
* by the current page table page, or to the end of the
* range being write protected.
*/
if (va_next > eva)
va_next = eva;
va = va_next;
for (pte = pmap_pde_to_pte(pde, sva); sva != va_next; pte++,
sva += PAGE_SIZE) {
if (!pte_test(pte, PTE_MANAGED | PTE_V)) {
if (va != va_next) {
pmap_invalidate_range(pmap, va, sva);
va = va_next;
}
continue;
}
pa = TLBLO_PTE_TO_PA(*pte);
m = PHYS_TO_VM_PAGE(pa);
m->md.pv_flags &= ~PV_TABLE_REF;
if (pte_test(pte, PTE_D)) {
if (advice == MADV_DONTNEED) {
/*
* Future calls to pmap_is_modified()
* can be avoided by making the page
* dirty now.
*/
vm_page_dirty(m);
} else {
pte_clear(pte, PTE_D);
if (va == va_next)
va = sva;
}
} else {
/*
* Unless PTE_D is set, any TLB entries
* mapping "sva" don't allow write access, so
* they needn't be invalidated.
*/
if (va != va_next) {
pmap_invalidate_range(pmap, va, sva);
va = va_next;
}
}
}
if (va != va_next)
pmap_invalidate_range(pmap, va, sva);
}
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
}
/*