1 files changed, 26 insertions, 22 deletions

diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index 4477bb107098..0480ca9e9e57 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -77,6 +77,32 @@ ENTRY(startup_32)
         subl %edi,%ecx
         shrl $2,%ecx
         rep ; stosl
+/*
+ * Copy bootup parameters out of the way.
+ * Note: %esi still has the pointer to the real-mode data.
+ * With the kexec as boot loader, parameter segment might be loaded beyond
+ * kernel image and might not even be addressable by early boot page tables.
+ * (kexec on panic case). Hence copy out the parameters before initializing
+ * page tables.
+ */
+        movl $(boot_params - __PAGE_OFFSET),%edi
+        movl $(PARAM_SIZE/4),%ecx
+        cld
+        rep
+        movsl
+        movl boot_params - __PAGE_OFFSET + NEW_CL_POINTER,%esi
+        andl %esi,%esi
+        jnz 2f                  # New command line protocol
+        cmpw $(OLD_CL_MAGIC),OLD_CL_MAGIC_ADDR
+        jne 1f
+        movzwl OLD_CL_OFFSET,%esi
+        addl $(OLD_CL_BASE_ADDR),%esi
+2:
+        movl $(saved_command_line - __PAGE_OFFSET),%edi
+        movl $(COMMAND_LINE_SIZE/4),%ecx
+        rep
+        movsl
+1:
 
 /*
  * Initialize page tables.  This creates a PDE and a set of page
@@ -214,28 +240,6 @@ ENTRY(startup_32_smp)
  */
         call setup_idt
 
-/*
- * Copy bootup parameters out of the way.
- * Note: %esi still has the pointer to the real-mode data.
- */
-        movl $boot_params,%edi
-        movl $(PARAM_SIZE/4),%ecx
-        cld
-        rep
-        movsl
-        movl boot_params+NEW_CL_POINTER,%esi
-        andl %esi,%esi
-        jnz 2f                  # New command line protocol
-        cmpw $(OLD_CL_MAGIC),OLD_CL_MAGIC_ADDR
-        jne 1f
-        movzwl OLD_CL_OFFSET,%esi
-        addl $(OLD_CL_BASE_ADDR),%esi
-2:
-        movl $saved_command_line,%edi
-        movl $(COMMAND_LINE_SIZE/4),%ecx
-        rep
-        movsl
-1:
 checkCPUtype:
 
         movl $-1,X86_CPUID              #  -1 for no CPUID initially