x86, mm: Break down init_all_memory_mapping
Will replace that with top-down page table initialization.
New API need to take range: init_range_memory_mapping()
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-21-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index da591eb..c688ea3 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -398,40 +398,30 @@
* Depending on the alignment of E820 ranges, this may possibly result in using
* smaller size (i.e. 4K instead of 2M or 1G) page tables.
*/
-static void __init init_all_memory_mapping(void)
+static void __init init_range_memory_mapping(unsigned long range_start,
+ unsigned long range_end)
{
unsigned long start_pfn, end_pfn;
int i;
- /* the ISA range is always mapped regardless of memory holes */
- init_memory_mapping(0, ISA_END_ADDRESS);
-
for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
u64 start = (u64)start_pfn << PAGE_SHIFT;
u64 end = (u64)end_pfn << PAGE_SHIFT;
- if (end <= ISA_END_ADDRESS)
+ if (end <= range_start)
continue;
- if (start < ISA_END_ADDRESS)
- start = ISA_END_ADDRESS;
-#ifdef CONFIG_X86_32
- /* on 32 bit, we only map up to max_low_pfn */
- if ((start >> PAGE_SHIFT) >= max_low_pfn)
+ if (start < range_start)
+ start = range_start;
+
+ if (start >= range_end)
continue;
- if ((end >> PAGE_SHIFT) > max_low_pfn)
- end = max_low_pfn << PAGE_SHIFT;
-#endif
+ if (end > range_end)
+ end = range_end;
+
init_memory_mapping(start, end);
}
-
-#ifdef CONFIG_X86_64
- if (max_pfn > max_low_pfn) {
- /* can we preseve max_low_pfn ?*/
- max_low_pfn = max_pfn;
- }
-#endif
}
void __init init_mem_mapping(void)
@@ -461,8 +451,15 @@
(pgt_buf_top << PAGE_SHIFT) - 1);
max_pfn_mapped = 0; /* will get exact value next */
- init_all_memory_mapping();
-
+ /* the ISA range is always mapped regardless of memory holes */
+ init_memory_mapping(0, ISA_END_ADDRESS);
+ init_range_memory_mapping(ISA_END_ADDRESS, end);
+#ifdef CONFIG_X86_64
+ if (max_pfn > max_low_pfn) {
+ /* can we preseve max_low_pfn ?*/
+ max_low_pfn = max_pfn;
+ }
+#endif
/*
* Reserve the kernel pagetable pages we used (pgt_buf_start -
* pgt_buf_end) and free the other ones (pgt_buf_end - pgt_buf_top)