x86: extend e820 early_res support 32bit -fix #3

introduce init_pg_table_start, so xen PV could specify the value.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index b2cc73768a9d..bef4618feadb 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -194,6 +194,7 @@ default_entry:
         xorl %ebx,%ebx                          /* %ebx is kept at zero */
 
         movl $pa(pg0), %edi
+        movl %edi, pa(init_pg_tables_start)
         movl $pa(swapper_pg_pmd), %edx
         movl $PTE_ATTR, %eax
 10:
@@ -228,6 +229,7 @@ default_entry:
 page_pde_offset = (__PAGE_OFFSET >> 20);
 
         movl $pa(pg0), %edi
+        movl %edi, pa(init_pg_tables_start)
         movl $pa(swapper_pg_dir), %edx
         movl $PTE_ATTR, %eax
 10: