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powerpc/booke: Use the DMAP if possible in pmap_map()

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This avoids unnecessary TLB usage for statically mapped regions, such as
vm_page_array.
This commit is contained in:
jhibbits 2019-08-25 20:08:48 +00:00
parent 3a6755f808
commit e856fe61f0
1 changed files with 5 additions and 3 deletions
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8
sys/powerpc/booke/pmap.c
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@ -2546,8 +2546,11 @@ mmu_booke_map(mmu_t mmu, vm_offset_t *virt, vm_paddr_t pa_start,
vm_offset_t sva = *virt;
vm_offset_t va = sva;
//debugf("mmu_booke_map: s (sva = 0x%08x pa_start = 0x%08x pa_end = 0x%08x)\n",
// sva, pa_start, pa_end);
#ifdef __powerpc64__
/* XXX: Handle memory not starting at 0x0. */
if (pa_end < ctob(Maxmem))
return (PHYS_TO_DMAP(pa_start));
#endif
while (pa_start < pa_end) {
mmu_booke_kenter(mmu, va, pa_start);
@ -2556,7 +2559,6 @@ mmu_booke_map(mmu_t mmu, vm_offset_t *virt, vm_paddr_t pa_start,
}
*virt = va;
//debugf("mmu_booke_map: e (va = 0x%08x)\n", va);
return (sva);
}