Only memcpy as much as we need to when we need to.

[netwatch.git] / aseg-paging / pagingstub.c

diff --git a/aseg-paging/pagingstub.c b/aseg-paging/pagingstub.c
index 678f2ea11d3279a39c996e62984a1bb05ba2da47..782bf0f589042e90cc72bfac367cc7e97ab1f6c8 100644 (file)
--- a/aseg-paging/pagingstub.c
+++ b/aseg-paging/pagingstub.c
@@ -61,17 +61,19 @@ unsigned long v2p(void *virt)
        if (!paging_enb)
                return _virt;
        
-       if (_virt >= 0xA0000 && _virt < 0xC0000)
-               return _virt;
-       if (_virt >= 0x200000 && _virt < 0x300000)
-               return _virt - 0x200000 + /* XXX */ 0x1FF82000;
-       if (_virt >= 0x1F0000 && _virt < 0x1F2000)
-               return _virt - 0x1F0000 + 0x1FF80000;
-       if ((_virt & ~0xFFF) == 0x4000)
-               return _virt - 0x4000 + curmapped;
+       unsigned long pde = ((unsigned long *)p2v((unsigned long)pd))[PDE_FOR(_virt)];
+       unsigned long pte;
+       
+       if (!(pde & PTE_PRESENT))
+               return 0xFFFFFFFF;
+       
+       if (pde & PDE_PAGE_SIZE)
+               return ADDR_12_MASK(pde) + (_virt & 0x3FFFFF);
        
-       outputf("WARNING: v2p(%08x)", _virt);
-       return 0xFFFFFFFF;
+       pte = ((unsigned long *)p2v(ADDR_12_MASK(pde)))[PTE_FOR(_virt)];
+       if (!(pte & PTE_PRESENT))
+               return 0xFFFFFFFF;
+       return (pte & ~0xFFF) + (_virt & 0xFFF);
 }
 
 void *p2v(unsigned long phys)