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| author | Jeremy Fitzhardinge <jeremy@xensource.com> | 2008-02-13 16:20:35 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-02-13 16:20:35 +0100 |
| commit | 37cc8d7f963ba2deec29c9b68716944516a3244f (patch) | |
| tree | 33aa30fe472dad9d8f91d1ef653c6be57425e2b4 /arch/x86 | |
| parent | 416e2d63794d4e57774989429e174507801915f2 (diff) | |
| download | op-kernel-dev-37cc8d7f963ba2deec29c9b68716944516a3244f.zip op-kernel-dev-37cc8d7f963ba2deec29c9b68716944516a3244f.tar.gz | |
x86/early_ioremap: don't assume we're using swapper_pg_dir
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/ioremap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index a4897a8..9f42d7e 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -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); |
