core: Move early_res from arch/x86 to kernel/

This makes the range reservation feature available to other
architectures.

-v2: add get_max_mapped, max_pfn_mapped only defined in x86...
     to fix PPC compiling
-v3: according to hpa, add CONFIG_HAVE_EARLY_RES
-v4: fix typo about EARLY_RES in config

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4B7B5723.4070009@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 36918d8463a..740b440fbd7 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -17,7 +17,6 @@
 #include <linux/firmware-map.h>
 
 #include <asm/e820.h>
-#include <asm/early_res.h>
 #include <asm/proto.h>
 #include <asm/setup.h>
 
@@ -752,6 +751,15 @@ u64 __init find_fw_memmap_area(u64 start, u64 end, u64 size, u64 align)
 {
         return find_e820_area(start, end, size, align);
 }
+
+u64 __init get_max_mapped(void)
+{
+        u64 end = max_pfn_mapped;
+
+        end <<= PAGE_SHIFT;
+
+        return end;
+}
 /*
  * Find next free range after *start
  */