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xen: clean up xen_load_gdt

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Makes the logic a bit clearer.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2009-03-04 13:02:18 -08:00
parent 7571a60446
commit 6ed6bf428a
1 changed files with 13 additions and 2 deletions
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15
arch/x86/xen/enlighten.c
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@ -301,10 +301,21 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
frames = mcs.args;
for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
frames[f] = arbitrary_virt_to_mfn((void *)va);
int level;
pte_t *ptep = lookup_address(va, &level);
unsigned long pfn, mfn;
void *virt;
BUG_ON(ptep == NULL);
pfn = pte_pfn(*ptep);
mfn = pfn_to_mfn(pfn);
virt = __va(PFN_PHYS(pfn));
frames[f] = mfn;
make_lowmem_page_readonly((void *)va);
make_lowmem_page_readonly(mfn_to_virt(frames[f]));
make_lowmem_page_readonly(virt);
}
MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));