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x86/early_ioremap: don't assume we're using swapper_pg_dir

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At the early stages of boot, before the kernel pagetable has been
fully initialized, a Xen kernel will still be running off the
Xen-provided pagetables rather than swapper_pg_dir[].  Therefore,
readback cr3 to determine the base of the pagetable rather than
assuming swapper_pg_dir[].

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Tested-by: Jody Belka <knew-linux@pimb.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-02-13 16:20:35 +01:00 committed by Ingo Molnar
parent 416e2d6379
commit 37cc8d7f96
1 changed files with 3 additions and 1 deletions
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4
arch/x86/mm/ioremap.c
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@ -265,7 +265,9 @@ static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
{
pgd_t *pgd = &swapper_pg_dir[pgd_index(addr)];
/* Don't assume we're using swapper_pg_dir at this point */
pgd_t *base = __va(read_cr3());
pgd_t *pgd = &base[pgd_index(addr)];
pud_t *pud = pud_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);