diff options
author | Jeremy Fitzhardinge <jeremy@xensource.com> | 2008-02-13 10:20:35 -0500 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-02-13 10:20:35 -0500 |
commit | 37cc8d7f963ba2deec29c9b68716944516a3244f (patch) | |
tree | 33aa30fe472dad9d8f91d1ef653c6be57425e2b4 /arch | |
parent | 416e2d63794d4e57774989429e174507801915f2 (diff) |
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')
-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 a4897a85268a..9f42d7e9c158 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)] | |||
265 | 265 | ||
266 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) | 266 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) |
267 | { | 267 | { |
268 | pgd_t *pgd = &swapper_pg_dir[pgd_index(addr)]; | 268 | /* Don't assume we're using swapper_pg_dir at this point */ |
269 | pgd_t *base = __va(read_cr3()); | ||
270 | pgd_t *pgd = &base[pgd_index(addr)]; | ||
269 | pud_t *pud = pud_offset(pgd, addr); | 271 | pud_t *pud = pud_offset(pgd, addr); |
270 | pmd_t *pmd = pmd_offset(pud, addr); | 272 | pmd_t *pmd = pmd_offset(pud, addr); |
271 | 273 | ||