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For physical address regions between 0 and KERNLOAD, allow pmap_mapdev()

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to use the direct mapped KVA at KERNBASE to service the request.  This also
allows pmap_mapdev() to be used for such addresses very early during the
boot process and might provide some small savings on KVA.

Reviewed by:	peter
This commit is contained in:
John Baldwin 2003-10-31 21:02:04 +00:00
parent 221111f6f2
commit cd7ccabe44
1 changed files with 7 additions and 2 deletions
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9
sys/i386/i386/pmap.c
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@ -2881,12 +2881,15 @@ pmap_mapdev(pa, size)
offset = pa & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);
pa = pa & PG_FRAME;
va = kmem_alloc_nofault(kernel_map, size);
if (pa < KERNLOAD && pa + size <= KERNLOAD)
va = KERNBASE + pa;
else
va = kmem_alloc_nofault(kernel_map, size);
if (!va)
panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
pa = pa & PG_FRAME;
for (tmpva = va; size > 0; ) {
pmap_kenter(tmpva, pa);
size -= PAGE_SIZE;
@ -2904,6 +2907,8 @@ pmap_unmapdev(va, size)
{
vm_offset_t base, offset, tmpva;
if (va >= KERNBASE && va + size <= KERNBASE + KERNLOAD)
return;
base = va & PG_FRAME;
offset = va & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);