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Enforce that pmap_mapdev() always returns uncacheable mappings.

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Reviewed by:	imp, jchandra, jmallett
This commit is contained in:
Neel Natu 2010-09-14 01:27:53 +00:00
parent 07ae21bae9
commit b503d5c50e
1 changed files with 17 additions and 9 deletions
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26
sys/mips/mips/pmap.c
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@ -828,8 +828,8 @@ retry:
/*
* add a wired page to the kva
*/
/* PMAP_INLINE */ void
pmap_kenter(vm_offset_t va, vm_paddr_t pa)
static void
pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr)
{
pt_entry_t *pte;
pt_entry_t opte, npte;
@ -837,12 +837,7 @@ pmap_kenter(vm_offset_t va, vm_paddr_t pa)
#ifdef PMAP_DEBUG
printf("pmap_kenter: va: %p -> pa: %p\n", (void *)va, (void *)pa);
#endif
npte = TLBLO_PA_TO_PFN(pa) | PTE_D | PTE_V | PTE_G | PTE_W;
if (is_cacheable_mem(pa))
npte |= PTE_C_CACHE;
else
npte |= PTE_C_UNCACHED;
npte = TLBLO_PA_TO_PFN(pa) | PTE_D | PTE_V | PTE_G | PTE_W | attr;
pte = pmap_pte(kernel_pmap, va);
opte = *pte;
@ -851,6 +846,19 @@ pmap_kenter(vm_offset_t va, vm_paddr_t pa)
pmap_update_page(kernel_pmap, va, npte);
}
void
pmap_kenter(vm_offset_t va, vm_paddr_t pa)
{
int attr;
if (is_cacheable_mem(pa))
attr = PTE_C_CACHE;
else
attr = PTE_C_UNCACHED;
pmap_kenter_attr(va, pa, attr);
}
/*
* remove a page from the kernel pagetables
*/
@ -2863,7 +2871,7 @@ pmap_mapdev(vm_offset_t pa, vm_size_t size)
panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
pa = trunc_page(pa);
for (tmpva = va; size > 0;) {
pmap_kenter(tmpva, pa);
pmap_kenter_attr(tmpva, pa, PTE_C_UNCACHED);
size -= PAGE_SIZE;
tmpva += PAGE_SIZE;
pa += PAGE_SIZE;