x86, 64-bit: unify early_ioremap

The 32-bit early_ioremap will work equally well for 64-bit, so just use it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/asm-x86/fixmap_64.h b/include/asm-x86/fixmap_64.h
index 626098823a0c..c7dcc365f470 100644
--- a/include/asm-x86/fixmap_64.h
+++ b/include/asm-x86/fixmap_64.h
@@ -49,6 +49,19 @@ enum fixed_addresses {
 #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
         FIX_OHCI1394_BASE,
 #endif
+        __end_of_permanent_fixed_addresses,
+        /*
+         * 256 temporary boot-time mappings, used by early_ioremap(),
+         * before ioremap() is functional.
+         *
+         * We round it up to the next 512 pages boundary so that we
+         * can have a single pgd entry and a single pte table:
+         */
+#define NR_FIX_BTMAPS           64
+#define FIX_BTMAPS_NESTING      4
+        FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 512 -
+                        (__end_of_permanent_fixed_addresses & 511),
+        FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS*FIX_BTMAPS_NESTING - 1,
         __end_of_fixed_addresses
 };