sanchayanmaity/minix
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

VM implicitly aligns mappings to a page

Browse source 
- 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
Show stats Download patch file Download diff file Expand all files Collapse all files

7
servers/vm/mmap.c
View file

@ -133,6 +133,7 @@ PUBLIC int do_map_phys(message *m)
struct vir_region *vr; struct vir_region *vr;
vir_bytes len; vir_bytes len;
phys_bytes startaddr; phys_bytes startaddr;
size_t offset;
target = m->VMMP_EP; target = m->VMMP_EP;
len = m->VMMP_LEN; len = m->VMMP_LEN;
@ -159,6 +160,10 @@ PUBLIC int do_map_phys(message *m)
if(!(vmp->vm_flags & VMF_HASPT)) if(!(vmp->vm_flags & VMF_HASPT))
return ENXIO; return ENXIO;
offset = startaddr % VM_PAGE_SIZE;
len += offset;
startaddr -= offset;
if(len % VM_PAGE_SIZE) if(len % VM_PAGE_SIZE)
len += VM_PAGE_SIZE - (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; 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; return OK;
} }