From db4b305d8f53edde7c008e6c74dfeb87bc1c65f4 Mon Sep 17 00:00:00 2001
From: Yinghai Lu <yinghai@kernel.org>
Date: Thu, 24 Jan 2013 12:19:51 -0800
Subject: [PATCH] --- yaml --- r: 356235 b: refs/heads/master c:
 4f7b92263ad68cdc72b11808320d9c881bfa857e h: refs/heads/master i:   356233:
 dcc5dcbad034225e497628c4ea7555cb2b286bee   356231:
 69c8d43d84ab50d402ffeedb7ace688087be9cf3 v: v3

---
 [refs]                                |  2 +-
 trunk/arch/x86/include/asm/realmode.h |  3 ++-
 trunk/arch/x86/kernel/setup.c         |  4 +++-
 trunk/arch/x86/realmode/init.c        | 32 +++++++++++++++++----------
 4 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/[refs] b/[refs]
index 6010cc0a81e0..6e001a376412 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9735e91e9c29c0d8fe432aef1152e43e50bdb316
+refs/heads/master: 4f7b92263ad68cdc72b11808320d9c881bfa857e
diff --git a/trunk/arch/x86/include/asm/realmode.h b/trunk/arch/x86/include/asm/realmode.h
index fe1ec5bcd846..9c6b890d5e7a 100644
--- a/trunk/arch/x86/include/asm/realmode.h
+++ b/trunk/arch/x86/include/asm/realmode.h
@@ -58,6 +58,7 @@ extern unsigned char boot_gdt[];
 extern unsigned char secondary_startup_64[];
 #endif
 
-extern void __init setup_real_mode(void);
+void reserve_real_mode(void);
+void setup_real_mode(void);
 
 #endif /* _ARCH_X86_REALMODE_H */
diff --git a/trunk/arch/x86/kernel/setup.c b/trunk/arch/x86/kernel/setup.c
index 5552d04b0cc1..85a8290801df 100644
--- a/trunk/arch/x86/kernel/setup.c
+++ b/trunk/arch/x86/kernel/setup.c
@@ -999,12 +999,14 @@ void __init setup_arch(char **cmdline_p)
 	printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
 			(max_pfn_mapped<<PAGE_SHIFT) - 1);
 
-	setup_real_mode();
+	reserve_real_mode();
 
 	trim_platform_memory_ranges();
 
 	init_mem_mapping();
 
+	setup_real_mode();
+
 	memblock.current_limit = get_max_mapped();
 	dma_contiguous_reserve(0);
 
diff --git a/trunk/arch/x86/realmode/init.c b/trunk/arch/x86/realmode/init.c
index ffee06ac7de9..4b5bdc8c8710 100644
--- a/trunk/arch/x86/realmode/init.c
+++ b/trunk/arch/x86/realmode/init.c
@@ -8,9 +8,26 @@
 struct real_mode_header *real_mode_header;
 u32 *trampoline_cr4_features;
 
-void __init setup_real_mode(void)
+void __init reserve_real_mode(void)
 {
 	phys_addr_t mem;
+	unsigned char *base;
+	size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob);
+
+	/* Has to be under 1M so we can execute real-mode AP code. */
+	mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE);
+	if (!mem)
+		panic("Cannot allocate trampoline\n");
+
+	base = __va(mem);
+	memblock_reserve(mem, size);
+	real_mode_header = (struct real_mode_header *) base;
+	printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
+	       base, (unsigned long long)mem, size);
+}
+
+void __init setup_real_mode(void)
+{
 	u16 real_mode_seg;
 	u32 *rel;
 	u32 count;
@@ -25,16 +42,7 @@ void __init setup_real_mode(void)
 	u64 efer;
 #endif
 
-	/* Has to be in very low memory so we can execute real-mode AP code. */
-	mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE);
-	if (!mem)
-		panic("Cannot allocate trampoline\n");
-
-	base = __va(mem);
-	memblock_reserve(mem, size);
-	real_mode_header = (struct real_mode_header *) base;
-	printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
-	       base, (unsigned long long)mem, size);
+	base = (unsigned char *)real_mode_header;
 
 	memcpy(base, real_mode_blob, size);
 
@@ -84,7 +92,7 @@ void __init setup_real_mode(void)
 }
 
 /*
- * setup_real_mode() gets called very early, to guarantee the
+ * reserve_real_mode() gets called very early, to guarantee the
  * availability of low memory. This is before the proper kernel page
  * tables are set up, so we cannot set page permissions in that
  * function. Also trampoline code will be executed by APs so we