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VM implicitly aligns mappings to a page

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- problem when a PCI BAR is not aligned

- together with  David v. Moolenboek
This commit is contained in:
Tomas Hruby 2010-10-21 17:07:05 +00:00
parent a1eefc013e
commit de1bcaa69a
1 changed files with 6 additions and 1 deletions
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7
servers/vm/mmap.c
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@ -133,6 +133,7 @@ PUBLIC int do_map_phys(message *m)
struct vir_region *vr;
vir_bytes len;
phys_bytes startaddr;
size_t offset;
target = m->VMMP_EP;
len = m->VMMP_LEN;
@ -159,6 +160,10 @@ PUBLIC int do_map_phys(message *m)
if(!(vmp->vm_flags & VMF_HASPT))
return ENXIO;
offset = startaddr % VM_PAGE_SIZE;
len += offset;
startaddr -= offset;
if(len % VM_PAGE_SIZE)
len += VM_PAGE_SIZE - (len % VM_PAGE_SIZE);
@ -168,7 +173,7 @@ PUBLIC int do_map_phys(message *m)
return ENOMEM;
}
m->VMMP_VADDR_REPLY = (void *) arch_map2vir(vmp, vr->vaddr);
m->VMMP_VADDR_REPLY = (void *) (arch_map2vir(vmp, vr->vaddr) + offset);
return OK;
}