x86: introduce initmem_init for 64 bit

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 97c2bc741e94..99a091ee5a6a 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -611,6 +611,22 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, unsigned lon
 }
 
 #ifndef CONFIG_NUMA
+void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
+{
+        unsigned long bootmap_size, bootmap;
+
+        bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
+        bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
+                                 PAGE_SIZE);
+        if (bootmap == -1L)
+                panic("Cannot find bootmem map of size %ld\n", bootmap_size);
+        bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
+        e820_register_active_regions(0, start_pfn, end_pfn);
+        free_bootmem_with_active_regions(0, end_pfn);
+        early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
+        reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
+}
+
 void __init paging_init(void)
 {
         unsigned long max_zone_pfns[MAX_NR_ZONES];